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Rev | Author | Line No. | Line |
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129 | mikedld | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; FAT32.INC ;; |
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4 | ;; ;; |
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131 | diamond | 5 | ;; FAT16/32 functions for KolibriOS ;; |
129 | mikedld | 6 | ;; ;; |
7 | ;; Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it ;; |
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8 | ;; ;; |
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9 | ;; See file COPYING for details ;; |
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131 | diamond | 10 | ;; 17.08.2006 LFN write/append to file - diamond ;; |
129 | mikedld | 11 | ;; 23.06.2006 LFN start application - diamond ;; |
12 | ;; 15.06.2006 LFN get/set file/folder info - diamond ;; |
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13 | ;; 27.05.2006 LFN create/rewrite file - diamond ;; |
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14 | ;; 04.05.2006 LFN read folder - diamond ;; |
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15 | ;; 29.04.2006 Elimination of hangup after the ;; |
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16 | ;; expiration hd_wait_timeout - Mario79 ;; |
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17 | ;; 23.04.2006 LFN read file - diamond ;; |
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18 | ;; 28.01.2006 find all Fat16/32 partition in all input point ;; |
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19 | ;; to MBR, see file part_set.inc - Mario79 ;; |
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20 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
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21 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
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22 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
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23 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
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24 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
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25 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
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26 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
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27 | ;; 08.11.2004 rename - ATV ;; |
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28 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
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29 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
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30 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
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31 | ;; 06.9.2004 Fix free space by Mario79 added - MH ;; |
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32 | ;; 24.5.2004 Write back buffer for File_write -VT ;; |
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33 | ;; 20.5.2004 File_read function to work with syscall 58 - VT ;; |
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34 | ;; 30.3.2004 Error parameters at function return - VT ;; |
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35 | ;; 01.5.2002 Bugfix in device write - VT ;; |
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36 | ;; 20.5.2002 Hd status check - VT ;; |
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37 | ;; 29.6.2002 Improved fat32 verification - VT ;; |
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38 | ;; ;; |
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39 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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40 | |||
41 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
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42 | |||
43 | ERROR_SUCCESS = 0 |
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44 | ERROR_DISK_BASE = 1 |
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45 | ERROR_UNSUPPORTED_FS = 2 |
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46 | ERROR_UNKNOWN_FS = 3 |
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47 | ERROR_PARTITION = 4 |
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48 | ERROR_FILE_NOT_FOUND = 5 |
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49 | ERROR_END_OF_FILE = 6 |
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50 | ERROR_MEMORY_POINTER = 7 |
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51 | ERROR_DISK_FULL = 8 |
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52 | ERROR_FAT_TABLE = 9 |
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53 | ERROR_ACCESS_DENIED = 10 |
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54 | |||
55 | PUSHAD_EAX equ [esp+28] |
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56 | PUSHAD_ECX equ [esp+24] |
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57 | PUSHAD_EDX equ [esp+20] |
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58 | PUSHAD_EBX equ [esp+16] |
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59 | PUSHAD_EBP equ [esp+8] |
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60 | PUSHAD_ESI equ [esp+4] |
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61 | PUSHAD_EDI equ [esp+0] |
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62 | |||
63 | cluster dd 0 ; used by file_write,makedir,append |
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64 | partition_count dd 0 ; partitions found by set_FAT32_variables |
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65 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
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66 | longname_sec2 dd 0 ; directory sectors for delete long filename |
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67 | |||
68 | hd_error dd 0 ; set by wait_for_sector_buffer |
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69 | hd_setup dd 0 |
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70 | hd_wait_timeout dd 0 |
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71 | |||
72 | cluster_tmp dd 0 ; used by analyze_directory |
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73 | ; and analyze_directory_to_write |
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74 | |||
75 | file_size dd 0 ; used by file_read |
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76 | |||
77 | sector_tmp dd 0 ; used by rename,append,file_write |
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78 | entry_pos dd 0 ; used by rename,append,file_write |
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79 | |||
80 | old_filesize dd 0 ; used by append |
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81 | new_filepos dd 0 ; used by append |
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82 | bytes2write dd 0 ; used by append |
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83 | |||
84 | cache_search_start dd 0 ; used by find_empty_slot |
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85 | |||
86 | fat_in_cache dd -1 |
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87 | fat_cache: times 512 db 0 |
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88 | |||
89 | uglobal |
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90 | Sector512: ; label for dev_hdcd.inc |
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91 | buffer: times 512 db 0 |
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92 | deltree_buffer: times 512 db 0 |
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93 | endg |
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94 | |||
95 | iglobal |
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96 | NewDirEntry1 db ". ",0x10 |
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97 | times 20 db 0 |
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98 | NewDirEntry2 db ".. ",0x10 |
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99 | times 20 db 0 |
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100 | endg |
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101 | |||
102 | uglobal |
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103 | dir_entry: times 32 db 0 |
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104 | |||
105 | startpath: times 255 db 0 |
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106 | |||
107 | fat16_root db 0 ; flag for fat16 rootdir |
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108 | fat_change db 0 ; 1=fat has changed |
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109 | |||
110 | endg |
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111 | |||
112 | reserve_hd1: |
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113 | |||
114 | cli |
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115 | cmp [hd1_status],0 |
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116 | je reserve_ok1 |
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117 | |||
118 | sti |
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119 | call change_task |
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120 | jmp reserve_hd1 |
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121 | |||
122 | reserve_ok1: |
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123 | |||
124 | push eax |
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125 | mov eax,[0x3000] |
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126 | shl eax,5 |
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127 | mov eax,[eax+0x3000+TASKDATA.pid] |
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128 | mov [hd1_status],eax |
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129 | pop eax |
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130 | sti |
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131 | ret |
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132 | ;******************************************** |
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133 | reserve_hd_channel: |
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134 | cmp [hdbase], 0x1F0 |
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135 | jne .IDE_Channel_2 |
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136 | .IDE_Channel_1: |
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137 | cli |
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138 | cmp [IDE_Channel_1],0 |
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139 | je .reserve_ok_1 |
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140 | sti |
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141 | call change_task |
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142 | jmp .IDE_Channel_1 |
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143 | .IDE_Channel_2: |
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144 | cli |
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145 | cmp [IDE_Channel_2],0 |
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146 | je .reserve_ok_2 |
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147 | sti |
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148 | call change_task |
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149 | jmp .IDE_Channel_1 |
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150 | .reserve_ok_1: |
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151 | mov [IDE_Channel_1],1 |
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152 | ret |
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153 | .reserve_ok_2: |
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154 | mov [IDE_Channel_2],1 |
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155 | ret |
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156 | |||
157 | free_hd_channel: |
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158 | cmp [hdbase], 0x1F0 |
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159 | jne .IDE_Channel_2 |
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160 | .IDE_Channel_1: |
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161 | mov [IDE_Channel_1],0 |
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162 | ret |
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163 | .IDE_Channel_2: |
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164 | mov [IDE_Channel_2],0 |
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165 | ret |
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166 | ;******************************************** |
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167 | clear_hd_cache: |
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168 | |||
169 | push eax ecx edi |
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170 | mov edi,0x600000 |
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171 | mov ecx,16384 |
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172 | xor eax,eax |
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173 | cld |
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174 | rep stosd ; clear hd cache with 0 |
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175 | mov [cache_search_start],eax |
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176 | mov [fat_in_cache],-1 |
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177 | mov [fat_change],0 |
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178 | pop edi ecx eax |
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179 | ret |
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180 | |||
181 | problem_partition db 0 ; used for partitions search |
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182 | |||
183 | include 'part_set.inc' |
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184 | |||
185 | set_FAT: |
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186 | ;-------------------------------- |
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187 | ; input : EAX = cluster |
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188 | ; EDX = value to save |
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189 | ; output : EDX = old value |
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190 | ;-------------------------------- |
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191 | push eax ebx esi |
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192 | |||
193 | cmp eax,2 |
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194 | jb sfc_error |
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195 | cmp eax,[LAST_CLUSTER] |
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196 | ja sfc_error |
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197 | cmp [fat_type],16 |
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198 | je sfc_1 |
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199 | add eax,eax |
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200 | sfc_1: |
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201 | add eax,eax |
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202 | mov esi,511 |
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203 | and esi,eax ; esi = position in fat sector |
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204 | shr eax,9 ; eax = fat sector |
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205 | add eax,[FAT_START] |
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206 | mov ebx,fat_cache |
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207 | |||
208 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
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209 | je sfc_in_cache ; yes |
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210 | |||
211 | cmp [fat_change],0 ; is fat changed? |
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212 | je sfc_no_change ; no |
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213 | call write_fat_sector ; yes. write it into disk |
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214 | cmp [hd_error],0 |
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215 | jne sfc_error |
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216 | |||
217 | sfc_no_change: |
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218 | mov [fat_in_cache],eax ; save fat sector |
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219 | call hd_read |
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220 | cmp [hd_error],0 |
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221 | jne sfc_error |
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222 | |||
223 | |||
224 | sfc_in_cache: |
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225 | cmp [fat_type],16 |
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226 | jne sfc_test32 |
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227 | |||
228 | sfc_set16: |
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229 | xchg [ebx+esi],dx ; save new value and get old value |
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230 | jmp sfc_write |
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231 | |||
232 | sfc_test32: |
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233 | mov eax,[fatMASK] |
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234 | |||
235 | sfc_set32: |
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236 | and edx,eax |
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237 | xor eax,-1 ; mask for high bits |
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238 | and eax,[ebx+esi] ; get high 4 bits |
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239 | or eax,edx |
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240 | mov edx,[ebx+esi] ; get old value |
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241 | mov [ebx+esi],eax ; save new value |
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242 | |||
243 | sfc_write: |
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244 | mov [fat_change],1 ; fat has changed |
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245 | |||
246 | sfc_nonzero: |
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247 | and edx,[fatMASK] |
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248 | |||
249 | sfc_error: |
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250 | pop esi ebx eax |
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251 | ret |
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252 | |||
253 | |||
254 | get_FAT: |
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255 | ;-------------------------------- |
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256 | ; input : EAX = cluster |
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257 | ; output : EAX = next cluster |
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258 | ;-------------------------------- |
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259 | push ebx esi |
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260 | |||
261 | cmp [fat_type],16 |
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262 | je gfc_1 |
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263 | add eax,eax |
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264 | gfc_1: |
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265 | add eax,eax |
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266 | mov esi,511 |
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267 | and esi,eax ; esi = position in fat sector |
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268 | shr eax,9 ; eax = fat sector |
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269 | add eax,[FAT_START] |
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270 | mov ebx,fat_cache |
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271 | |||
272 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
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273 | je gfc_in_cache |
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274 | |||
275 | cmp [fat_change],0 ; is fat changed? |
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276 | je gfc_no_change ; no |
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277 | call write_fat_sector ; yes. write it into disk |
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278 | cmp [hd_error],0 |
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279 | jne hd_error_01 |
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280 | |||
281 | gfc_no_change: |
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282 | mov [fat_in_cache],eax |
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283 | call hd_read |
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284 | cmp [hd_error],0 |
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285 | jne hd_error_01 |
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286 | |||
287 | gfc_in_cache: |
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288 | mov eax,[ebx+esi] |
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289 | and eax,[fatMASK] |
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290 | hd_error_01: |
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291 | pop esi ebx |
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292 | ret |
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293 | |||
294 | |||
295 | get_free_FAT: |
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296 | ;----------------------------------------------------------- |
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297 | ; input : EAX = # cluster for start the searching |
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298 | ; output : if CARRY=0 EAX = # first cluster found free |
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299 | ; if CARRY=1 disk full |
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300 | ; Note : for more speed need to use fat_cache directly |
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301 | ;----------------------------------------------------------- |
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302 | push ecx |
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303 | mov ecx,[LAST_CLUSTER] ; counter for full disk |
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304 | sub ecx,2 |
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305 | |||
306 | gff_test: |
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307 | cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2 |
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308 | jbe gff_in_range |
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309 | mov eax,2 |
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310 | |||
311 | gff_in_range: |
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312 | push eax |
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313 | call get_FAT ; get cluster state |
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314 | cmp [hd_error],0 |
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315 | jne gff_not_found_1 |
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316 | |||
317 | test eax,eax ; is it free? |
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318 | pop eax |
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319 | je gff_found ; yes |
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320 | inc eax ; next cluster |
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321 | dec ecx ; is all checked? |
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322 | jns gff_test ; no |
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323 | |||
324 | gff_not_found_1: |
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325 | add esp,4 |
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326 | gff_not_found: |
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327 | pop ecx ; yes. disk is full |
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328 | stc |
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329 | ret |
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330 | |||
331 | gff_found: |
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332 | pop ecx |
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333 | clc |
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334 | ret |
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335 | |||
336 | |||
337 | write_fat_sector: |
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338 | ;----------------------------------------------------------- |
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339 | ; write changed fat to disk |
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340 | ;----------------------------------------------------------- |
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341 | push eax ebx ecx |
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342 | |||
343 | mov [fat_change],0 |
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344 | mov eax,[fat_in_cache] |
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345 | cmp eax,-1 |
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346 | jz write_fat_not_used |
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347 | mov ebx,fat_cache |
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348 | mov ecx,[NUMBER_OF_FATS] |
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349 | |||
350 | write_next_fat: |
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351 | call hd_write |
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352 | cmp [hd_error],0 |
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353 | jne write_fat_not_used |
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354 | |||
355 | add eax,[SECTORS_PER_FAT] |
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356 | dec ecx |
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357 | jnz write_next_fat |
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358 | |||
359 | write_fat_not_used: |
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360 | pop ecx ebx eax |
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361 | ret |
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362 | |||
363 | |||
364 | analyze_directory: |
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365 | ;----------------------------------------------------------- |
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366 | ; input : EAX = first cluster of the directory |
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367 | ; EBX = pointer to filename |
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368 | ; output : IF CARRY=0 EAX = sector where th file is found |
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369 | ; EBX = pointer in buffer |
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370 | ; [buffer .. buffer+511] |
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371 | ; ECX,EDX,ESI,EDI not changed |
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372 | ; IF CARRY=1 filename not found |
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373 | ; Note : if cluster=0 it's changed to read rootdir |
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374 | ; save 2 previous directory sectors in longname_sec |
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375 | ;----------------------------------------------------------- |
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376 | push ecx edx esi edi ebx ; ebx = [esp+0] |
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377 | mov [longname_sec1],0 |
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378 | mov [longname_sec2],0 |
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379 | |||
380 | adr_new_cluster: |
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381 | mov [cluster_tmp],eax |
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382 | mov [fat16_root],0 |
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383 | cmp eax,[LAST_CLUSTER] |
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384 | ja adr_not_found ; too big cluster number, something is wrong |
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385 | cmp eax,2 |
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386 | jnb adr_data_cluster |
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387 | |||
388 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
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389 | cmp [fat_type],16 |
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390 | jne adr_data_cluster |
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391 | mov eax,[ROOT_START] |
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392 | mov edx,[ROOT_SECTORS] |
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393 | mov [fat16_root],1 ; flag for fat16 rootdir |
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394 | jmp adr_new_sector |
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395 | |||
396 | adr_data_cluster: |
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397 | sub eax,2 |
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398 | mov edx,[SECTORS_PER_CLUSTER] |
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399 | imul eax,edx |
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400 | add eax,[DATA_START] |
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401 | |||
402 | adr_new_sector: |
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403 | mov ebx,buffer |
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404 | call hd_read |
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405 | cmp [hd_error],0 |
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406 | jne adr_not_found |
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407 | |||
408 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
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409 | |||
410 | adr_analyze: |
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411 | mov edi,[ebx+11] ; file attribute |
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412 | and edi,0xf |
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413 | cmp edi,0xf |
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414 | je adr_long_filename |
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415 | test edi,0x8 ; skip over volume label |
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416 | jne adr_long_filename ; Note: label can be same name as file/dir |
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417 | |||
418 | mov esi,[esp+0] ; filename need to be uppercase |
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419 | mov edi,ebx |
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420 | push ecx |
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421 | mov ecx,11 |
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422 | cld |
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423 | rep cmpsb ; compare 8+3 filename |
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424 | pop ecx |
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425 | je adr_found |
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426 | |||
427 | adr_long_filename: |
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428 | add ebx,32 ; position of next dir entry |
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429 | dec ecx |
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430 | jnz adr_analyze |
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431 | |||
432 | mov ecx,[longname_sec1] ; save 2 previous directory sectors |
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433 | mov [longname_sec1],eax ; for delete long filename |
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434 | mov [longname_sec2],ecx |
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435 | inc eax ; next sector |
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436 | dec edx |
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437 | jne adr_new_sector |
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438 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
439 | je adr_not_found |
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440 | |||
441 | adr_next_cluster: |
||
442 | mov eax,[cluster_tmp] |
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443 | call get_FAT ; get next cluster |
||
444 | cmp [hd_error],0 |
||
445 | jne adr_not_found |
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446 | |||
447 | cmp eax,2 ; incorrect fat chain? |
||
448 | jb adr_not_found ; yes |
||
449 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
450 | jb adr_new_cluster ; no. analyse it |
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451 | |||
452 | adr_not_found: |
||
453 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
454 | stc ; file not found |
||
455 | ret |
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456 | |||
457 | adr_found: |
||
458 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
459 | clc ; file found |
||
460 | ret |
||
461 | |||
462 | |||
463 | analyze_directory_to_write: |
||
464 | ;----------------------------------------------------------- |
||
465 | ; input : EAX = first cluster of the directory |
||
466 | ; output : IF CARRY=0 EAX = sector where the empty pos is found |
||
467 | ; EBX = pointer in buffer |
||
468 | ; [buffer .. buffer+511] |
||
469 | ; ECX,EDX,ESI,EDI not changed |
||
470 | ; IF CARRY=1 disk full or fat corrupted |
||
471 | ; Note : if cluster=0 it's changed to read rootdir |
||
472 | ;----------------------------------------------------------- |
||
473 | push ecx edx edi |
||
474 | |||
475 | adw_new_cluster: |
||
476 | mov [cluster_tmp],eax |
||
477 | mov [fat16_root],0 |
||
478 | cmp eax,[LAST_CLUSTER] |
||
479 | ja adw_not_found ; too big cluster number, something is wrong |
||
480 | cmp eax,2 |
||
481 | jnb adw_data_cluster |
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482 | |||
483 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
484 | cmp [fat_type],16 |
||
485 | jne adw_data_cluster |
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486 | mov eax,[ROOT_START] |
||
487 | mov edx,[ROOT_SECTORS] |
||
488 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
489 | jmp adw_new_sector |
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490 | |||
491 | adw_data_cluster: |
||
492 | sub eax,2 |
||
493 | mov edx,[SECTORS_PER_CLUSTER] |
||
494 | imul eax,edx |
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495 | add eax,[DATA_START] |
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496 | |||
497 | adw_new_sector: |
||
498 | mov ebx,buffer |
||
499 | call hd_read |
||
500 | cmp [hd_error],0 |
||
501 | jne adw_not_found |
||
502 | |||
503 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
||
504 | |||
505 | adw_analyze: |
||
506 | cmp byte [ebx],0x00 ; is free entry? |
||
507 | je adw_found ; yes |
||
508 | cmp byte [ebx],0xe5 ; is deleted entry? |
||
509 | je adw_found ; yes |
||
510 | add ebx,32 ; position of next dir entry |
||
511 | dec ecx |
||
512 | jnz adw_analyze |
||
513 | |||
514 | inc eax ; next sector |
||
515 | dec edx |
||
516 | jne adw_new_sector |
||
517 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
518 | je adw_not_found |
||
519 | |||
520 | mov eax,[cluster_tmp] |
||
521 | call get_FAT ; get next cluster |
||
522 | cmp [hd_error],0 |
||
523 | jne adw_not_found |
||
524 | |||
525 | cmp eax,2 ; incorrect fat chain? |
||
526 | jb adw_not_found ; yes |
||
527 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
528 | jb adw_new_cluster ; no. analyse it |
||
529 | |||
530 | mov eax,2 ; this block of code add a new cluster |
||
531 | call get_free_FAT ; for the directory because the directory |
||
532 | jc adw_not_found ; is full |
||
533 | |||
534 | mov edx,[fatEND] ; new end for directory |
||
535 | call set_FAT |
||
536 | cmp [hd_error],0 |
||
537 | jne adw_not_found |
||
538 | |||
539 | push eax ; save new cluster |
||
540 | mov edx,eax |
||
541 | mov eax,[cluster_tmp] ; change last cluster to point new cluster |
||
542 | call set_FAT |
||
543 | cmp [hd_error],0 |
||
544 | jne adw_not_found_1 |
||
545 | |||
546 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
547 | call add_disk_free_space |
||
548 | cmp [hd_error],0 |
||
549 | jne adw_not_found_1 |
||
550 | |||
551 | mov ecx,512/4 |
||
552 | xor eax,eax |
||
553 | mov edi,buffer |
||
554 | cld |
||
555 | rep stosd ; clear new directory cluster |
||
556 | pop eax |
||
557 | |||
558 | sub eax,2 |
||
559 | mov ecx,[SECTORS_PER_CLUSTER] |
||
560 | imul eax,ecx |
||
561 | add eax,[DATA_START] |
||
562 | mov ebx,buffer |
||
563 | push eax ; save sector number |
||
564 | |||
565 | adw_set_empty_directory: |
||
566 | call hd_write |
||
567 | cmp [hd_error],0 |
||
568 | jne adw_not_found_1 |
||
569 | |||
570 | inc eax ; next sector |
||
571 | dec ecx |
||
572 | jnz adw_set_empty_directory |
||
573 | |||
574 | pop eax |
||
575 | |||
576 | adw_found: |
||
577 | pop edi edx ecx |
||
578 | clc ; free space found |
||
579 | ret |
||
580 | adw_not_found_1: |
||
581 | add esp,4 |
||
582 | adw_not_found: |
||
583 | pop edi edx ecx |
||
584 | stc ; free space not found |
||
585 | ret |
||
586 | |||
587 | |||
588 | get_data_cluster: |
||
589 | ;----------------------------------------------------------- |
||
590 | ; input : EAX = cluster |
||
591 | ; EBX = pointer to buffer |
||
592 | ; EDX = # blocks to read in buffer |
||
593 | ; ESI = # blocks to skip over |
||
594 | ; output : if CARRY=0 ok EBX/EDX/ESI updated |
||
595 | ; if CARRY=1 cluster out of range |
||
596 | ; Note : if cluster=0 it's changed to read rootdir |
||
597 | ;----------------------------------------------------------- |
||
598 | push eax ecx |
||
599 | |||
600 | mov [fat16_root],0 |
||
601 | cmp eax,[LAST_CLUSTER] |
||
602 | ja gdc_error ; too big cluster number, something is wrong |
||
603 | cmp eax,2 |
||
604 | jnb gdc_cluster |
||
605 | |||
606 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
607 | cmp [fat_type],16 |
||
608 | jne gdc_cluster |
||
609 | mov eax,[ROOT_START] |
||
610 | mov ecx,[ROOT_SECTORS] ; Note: not cluster size |
||
611 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
612 | jmp gdc_read |
||
613 | |||
614 | gdc_cluster: |
||
615 | sub eax,2 |
||
616 | mov ecx,[SECTORS_PER_CLUSTER] |
||
617 | imul eax,ecx |
||
618 | add eax,[DATA_START] |
||
619 | |||
620 | gdc_read: |
||
621 | test esi,esi ; first wanted block |
||
622 | je gdcl1 ; yes, skip count is 0 |
||
623 | dec esi |
||
624 | jmp gdcl2 |
||
625 | |||
626 | gdcl1: |
||
627 | call hd_read |
||
628 | cmp [hd_error],0 |
||
629 | jne gdc_error |
||
630 | |||
631 | add ebx,512 ; update pointer |
||
632 | dec edx |
||
633 | |||
634 | gdcl2: |
||
635 | test edx,edx ; is all read? |
||
636 | je out_of_read |
||
637 | |||
638 | inc eax ; next sector |
||
639 | dec ecx |
||
640 | jnz gdc_read |
||
641 | |||
642 | out_of_read: |
||
643 | pop ecx eax |
||
644 | clc |
||
645 | ret |
||
646 | |||
647 | gdc_error: |
||
648 | pop ecx eax |
||
649 | stc |
||
650 | ret |
||
651 | |||
652 | |||
653 | set_data_cluster: |
||
654 | ;----------------------------------------------------------- |
||
655 | ; input : EAX = cluster |
||
656 | ; EBX = pointer to buffer |
||
657 | ; output : if CARRY=0 ok |
||
658 | ; if CARRY=1 cluster out of range |
||
659 | ;----------------------------------------------------------- |
||
660 | push eax ebx edx |
||
661 | |||
662 | cmp eax,[LAST_CLUSTER] |
||
663 | ja sdc_error ; too big cluster number, something is wrong |
||
664 | sub eax,2 |
||
665 | jb sdc_error ; don't allow rootdir write |
||
666 | |||
667 | mov edx,[SECTORS_PER_CLUSTER] |
||
668 | imul eax,edx |
||
669 | add eax,[DATA_START] |
||
670 | |||
671 | sdc_write: |
||
672 | call hd_write |
||
673 | cmp [hd_error],0 |
||
674 | jne sdc_error |
||
675 | |||
676 | add ebx,512 ; update pointer |
||
677 | inc eax |
||
678 | dec edx |
||
679 | jnz sdc_write |
||
680 | pop edx ebx eax |
||
681 | clc |
||
682 | ret |
||
683 | |||
684 | sdc_error: |
||
685 | pop edx ebx eax |
||
686 | stc |
||
687 | ret |
||
688 | |||
689 | |||
690 | get_cluster_of_a_path: |
||
691 | ;--------------------------------------------------------- |
||
692 | ; input : EBX = pointer to a path string |
||
693 | ; (example: the path "/files/data/document" become |
||
694 | ; "files......data.......document...0" |
||
695 | ; '.' = space char |
||
696 | ; '0' = char(0) (ASCII=0) !!! ) |
||
697 | ; output : if (CARRY=1) -> ERROR in the PATH |
||
698 | ; if (CARRY=0) -> EAX=cluster |
||
699 | ;--------------------------------------------------------- |
||
700 | push ebx edx |
||
701 | |||
702 | mov eax,[ROOT_CLUSTER] |
||
703 | mov edx,ebx |
||
704 | |||
705 | search_end_of_path: |
||
706 | cmp byte [edx],0 |
||
707 | je found_end_of_path |
||
708 | |||
709 | inc edx ; '/' |
||
710 | mov ebx,edx |
||
711 | call analyze_directory |
||
712 | jc directory_not_found |
||
713 | |||
714 | mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field |
||
715 | mov ax,[ebx+26] ; read the LOW 16bit cluster field |
||
716 | and eax,[fatMASK] |
||
717 | add edx,11 ; 8+3 (name+extension) |
||
718 | jmp search_end_of_path |
||
719 | |||
720 | found_end_of_path: |
||
721 | pop edx ebx |
||
722 | clc ; no errors |
||
723 | ret |
||
724 | |||
725 | directory_not_found: |
||
726 | pop edx ebx |
||
727 | stc ; errors occour |
||
728 | ret |
||
729 | |||
730 | |||
731 | bcd2bin: |
||
732 | ;---------------------------------- |
||
733 | ; input : AL=BCD number (eg. 0x11) |
||
734 | ; output : AH=0 |
||
735 | ; AL=decimal number (eg. 11) |
||
736 | ;---------------------------------- |
||
737 | xor ah,ah |
||
738 | shl ax,4 |
||
739 | shr al,4 |
||
740 | aad |
||
741 | ret |
||
742 | |||
743 | |||
744 | get_date_for_file: |
||
745 | ;----------------------------------------------------- |
||
746 | ; Get date from CMOS and pack day,month,year in AX |
||
747 | ; DATE bits 0..4 : day of month 0..31 |
||
748 | ; 5..8 : month of year 1..12 |
||
749 | ; 9..15 : count of years from 1980 |
||
750 | ;----------------------------------------------------- |
||
751 | mov al,0x7 ;day |
||
752 | out 0x70,al |
||
753 | in al,0x71 |
||
754 | call bcd2bin |
||
755 | ror eax,5 |
||
756 | |||
757 | mov al,0x8 ;month |
||
758 | out 0x70,al |
||
759 | in al,0x71 |
||
760 | call bcd2bin |
||
761 | ror eax,4 |
||
762 | |||
763 | mov al,0x9 ;year |
||
764 | out 0x70,al |
||
765 | in al,0x71 |
||
766 | call bcd2bin |
||
767 | add ax,20 ;because CMOS return only the two last |
||
768 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
769 | rol eax,9 ;need the difference with 1980 (eg. 2001-1980) |
||
770 | ret |
||
771 | |||
772 | |||
773 | get_time_for_file: |
||
774 | ;----------------------------------------------------- |
||
775 | ; Get time from CMOS and pack hour,minute,second in AX |
||
776 | ; TIME bits 0..4 : second (the low bit is lost) |
||
777 | ; 5..10 : minute 0..59 |
||
778 | ; 11..15 : hour 0..23 |
||
779 | ;----------------------------------------------------- |
||
780 | mov al,0x0 ;second |
||
781 | out 0x70,al |
||
782 | in al,0x71 |
||
783 | call bcd2bin |
||
784 | ror eax,6 |
||
785 | |||
786 | mov al,0x2 ;minute |
||
787 | out 0x70,al |
||
788 | in al,0x71 |
||
789 | call bcd2bin |
||
790 | ror eax,6 |
||
791 | |||
792 | mov al,0x4 ;hour |
||
793 | out 0x70,al |
||
794 | in al,0x71 |
||
795 | call bcd2bin |
||
796 | rol eax,11 |
||
797 | ret |
||
798 | |||
799 | |||
800 | set_current_time_for_entry: |
||
801 | ;----------------------------------------------------- |
||
802 | ; Set current time/date for file entry |
||
803 | ; input : ebx = file entry pointer |
||
804 | ;----------------------------------------------------- |
||
805 | push eax |
||
806 | call get_time_for_file ; update files date/time |
||
807 | mov [ebx+22],ax |
||
808 | call get_date_for_file |
||
809 | mov [ebx+24],ax |
||
810 | pop eax |
||
811 | ret |
||
812 | |||
813 | |||
814 | makedir: |
||
815 | ;----------------------------------------------------- |
||
816 | ; input : eax = directory name |
||
817 | ; edx = path |
||
818 | ; output : eax = 0 - ok |
||
819 | ; 3 - unknown FS |
||
820 | ; 5 - file not found |
||
821 | ; 8 - disk full |
||
822 | ; 10 - access denied |
||
823 | ; Note : can only make one directory at time |
||
824 | ;----------------------------------------------------- |
||
825 | cmp [fat_type],0 |
||
826 | jnz make_dir_fat_ok |
||
827 | mov eax,ERROR_UNKNOWN_FS |
||
828 | ret |
||
829 | |||
830 | make_dir_fat_ok: |
||
831 | ; call reserve_hd1 |
||
832 | |||
833 | pushad |
||
834 | |||
835 | mov ebx,edx |
||
836 | call get_cluster_of_a_path |
||
837 | jnc make_dir_found_path |
||
838 | cmp [hd_error],0 |
||
839 | jne make_dir_error_1 |
||
840 | |||
841 | make_dir_path_not_found: |
||
842 | popad |
||
843 | call update_disk ; write all of cache and fat to hd |
||
844 | cmp [hd_error],0 |
||
845 | jne make_dir_error_2 |
||
846 | |||
847 | mov [hd1_status],0 |
||
848 | mov eax,ERROR_FILE_NOT_FOUND |
||
849 | ret |
||
850 | |||
851 | make_dir_disk_full: |
||
852 | cmp [hd_error],0 |
||
853 | jne make_dir_error_1 |
||
854 | popad |
||
855 | call update_disk ; write all of cache and fat to hd |
||
856 | cmp [hd_error],0 |
||
857 | jne make_dir_error_2 |
||
858 | |||
859 | mov [hd1_status],0 |
||
860 | mov eax,ERROR_DISK_FULL |
||
861 | ret |
||
862 | |||
863 | make_dir_already_exist: |
||
864 | cmp [hd_error],0 |
||
865 | jne make_dir_error_1 |
||
866 | mov eax,[cluster] ; directory cluster |
||
867 | xor edx,edx ; free |
||
868 | call set_FAT |
||
869 | cmp [hd_error],0 |
||
870 | jne make_dir_error_1 |
||
871 | |||
872 | popad |
||
873 | call update_disk ; write all of cache and fat to hd |
||
874 | make_dir_error_2: |
||
875 | mov [hd1_status],0 |
||
876 | mov eax,ERROR_ACCESS_DENIED |
||
877 | ret |
||
878 | |||
879 | make_dir_error_1: |
||
880 | popad |
||
881 | jmp make_dir_error_2 |
||
882 | |||
883 | make_dir_error_3: |
||
884 | add esp,4 |
||
885 | jmp make_dir_error_1 |
||
886 | |||
887 | make_dir_found_path: |
||
888 | cmp eax,[ROOT_CLUSTER] |
||
889 | jnz make_dir_not_root |
||
890 | xor eax,eax |
||
891 | |||
892 | make_dir_not_root: |
||
893 | mov ecx,eax ; directorys start cluster |
||
894 | mov word [NewDirEntry2+26],cx ; 16 bits low of cluster |
||
895 | shr ecx,16 |
||
896 | mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16) |
||
897 | |||
898 | push eax ; save parent directory cluster |
||
899 | mov eax,2 |
||
900 | call get_free_FAT |
||
901 | mov [cluster],eax ; first free cluster |
||
902 | pop eax |
||
903 | jc make_dir_disk_full |
||
904 | |||
905 | push eax |
||
906 | mov eax,[cluster] ; directory cluster |
||
907 | mov edx,[fatEND] ; end for directory |
||
908 | call set_FAT |
||
909 | cmp [hd_error],0 |
||
910 | jne make_dir_error_3 |
||
911 | pop eax |
||
912 | |||
913 | mov ebx,PUSHAD_EAX ; dir name |
||
914 | push eax |
||
915 | call analyze_directory ; check if directory already exist |
||
916 | cmp [hd_error],0 |
||
917 | jne make_dir_error_1 |
||
918 | |||
919 | pop eax |
||
920 | jnc make_dir_already_exist ; need to free allocated cluster! |
||
921 | |||
922 | call analyze_directory_to_write |
||
923 | jc make_dir_already_exist ; need to free allocated cluster! |
||
924 | |||
925 | mov esi,PUSHAD_EAX ; dir name |
||
926 | mov edi,ebx ; pointer in buffer |
||
927 | mov ecx,11 |
||
928 | cld |
||
929 | rep movsb |
||
930 | |||
931 | mov dword [ebx+28],0 ; dir size is always 0 |
||
932 | mov ecx,[cluster] |
||
933 | mov [ebx+26],cx ; 16 bits low of cluster |
||
934 | mov word [NewDirEntry1+26],cx |
||
935 | shr ecx,16 |
||
936 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
937 | mov word [NewDirEntry1+20],cx |
||
938 | mov byte [ebx+11],0x10 ; attribute = directory |
||
939 | |||
940 | call set_current_time_for_entry |
||
941 | mov ecx,[ebx+22] |
||
942 | mov dword [NewDirEntry1+22],ecx |
||
943 | mov dword [NewDirEntry2+22],ecx |
||
944 | |||
945 | mov ebx,buffer ; save the directory name,length,cluster |
||
946 | call hd_write |
||
947 | cmp [hd_error],0 |
||
948 | jne make_dir_error_1 |
||
949 | |||
950 | mov ecx,512/4 |
||
951 | xor eax,eax |
||
952 | mov edi,buffer |
||
953 | cld |
||
954 | rep stosd ; clear new directory cluster |
||
955 | |||
956 | mov eax,[cluster] ; new directory cluster |
||
957 | sub eax,2 |
||
958 | mov edx,[SECTORS_PER_CLUSTER] |
||
959 | imul eax,edx |
||
960 | add eax,[DATA_START] |
||
961 | mov ebx,buffer |
||
962 | add eax,edx ; start from last sector |
||
963 | |||
964 | dir_set_empty_directory: |
||
965 | dec eax ; next sector |
||
966 | cmp edx,1 ; is first directory sector? |
||
967 | jnz not_first_sector ; no. write empty sector |
||
968 | mov esi,NewDirEntry1 |
||
969 | mov edi,buffer |
||
970 | mov ecx,64/4 |
||
971 | cld |
||
972 | rep movsd ; copy 2 first directory entrys "." and ".." |
||
973 | |||
974 | not_first_sector: |
||
975 | call hd_write |
||
976 | cmp [hd_error],0 |
||
977 | jne make_dir_error_1 |
||
978 | |||
979 | dec edx |
||
980 | jnz dir_set_empty_directory |
||
981 | |||
982 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
983 | call add_disk_free_space |
||
984 | cmp [hd_error],0 |
||
985 | jne make_dir_error_1 |
||
986 | |||
987 | popad |
||
988 | call update_disk ; write all of cache and fat to hd |
||
989 | cmp [hd_error],0 |
||
990 | jne make_dir_error_2 |
||
991 | mov [hd1_status],0 |
||
992 | xor eax,eax |
||
993 | ret |
||
994 | |||
995 | |||
996 | removedir: |
||
997 | ;----------------------------------------------------- |
||
998 | ; input : eax = file/directory name |
||
999 | ; edx = path |
||
1000 | ; output : eax = 0 - ok |
||
1001 | ; 3 - unknown FS |
||
1002 | ; 5 - file not found |
||
1003 | ; 10 - access denied |
||
1004 | ;----------------------------------------------------- |
||
1005 | cmp [fat_type],0 |
||
1006 | jnz remove_dir_fat_ok |
||
1007 | mov eax,ERROR_UNKNOWN_FS |
||
1008 | ret |
||
1009 | |||
1010 | remove_dir_fat_ok: |
||
1011 | ; call reserve_hd1 |
||
1012 | |||
1013 | push edi |
||
1014 | mov edi,1 ; allow directory remove |
||
1015 | call file_delete |
||
1016 | cmp [hd_error],0 |
||
1017 | jne @f |
||
1018 | |||
1019 | pop edi |
||
1020 | |||
1021 | call update_disk ; write all of cache and fat to hd |
||
1022 | @@: |
||
1023 | mov [hd1_status],0 |
||
1024 | ret |
||
1025 | |||
1026 | |||
1027 | add_disk_free_space: |
||
1028 | ;----------------------------------------------------- |
||
1029 | ; input : ecx = cluster count |
||
1030 | ; Note : negative = remove clusters from free space |
||
1031 | ; positive = add clusters to free space |
||
1032 | ;----------------------------------------------------- |
||
1033 | test ecx,ecx ; no change |
||
1034 | je add_dfs_no |
||
1035 | cmp [fat_type],32 ; free disk space only used by fat32 |
||
1036 | jne add_dfs_no |
||
1037 | |||
1038 | push eax ebx |
||
1039 | mov eax,[ADR_FSINFO] |
||
1040 | mov ebx,buffer |
||
1041 | call hd_read |
||
1042 | cmp [hd_error],0 |
||
1043 | jne add_not_fs |
||
1044 | |||
1045 | cmp dword [ebx+0x1fc],0xaa550000 ; check sector id |
||
1046 | jne add_not_fs |
||
1047 | |||
1048 | add [ebx+0x1e8],ecx |
||
1049 | call hd_write |
||
1050 | cmp [hd_error],0 |
||
1051 | jne add_not_fs |
||
1052 | |||
1053 | add_not_fs: |
||
1054 | pop ebx eax |
||
1055 | |||
1056 | add_dfs_no: |
||
1057 | ret |
||
1058 | |||
1059 | |||
1060 | file_append: |
||
1061 | ;----------------------------------------------------- |
||
1062 | ; input : eax = file name |
||
1063 | ; edx = path |
||
1064 | ; ecx = pointer to buffer |
||
1065 | ; ebx = bytes to write (0 = truncate file) |
||
1066 | ; esi = start position (-1 = end of file) |
||
1067 | ; output : eax = 0 - ok |
||
1068 | ; 3 - unknown FS |
||
1069 | ; 5 - file not found |
||
1070 | ; 6 - end of file |
||
1071 | ; 8 - disk full |
||
1072 | ; 9 - fat table corrupted |
||
1073 | ; 10 - access denied |
||
1074 | ; ebx = bytes written |
||
1075 | ;----------------------------------------------------- |
||
1076 | cmp [fat_type],0 |
||
1077 | jnz append_fat_ok |
||
1078 | mov eax,ERROR_UNKNOWN_FS |
||
1079 | ret |
||
1080 | |||
1081 | append_fat_ok: |
||
1082 | ; call reserve_hd1 |
||
1083 | |||
1084 | pushad |
||
1085 | |||
1086 | mov ebx,edx |
||
1087 | call get_cluster_of_a_path |
||
1088 | jc append_not_found |
||
1089 | |||
1090 | mov ebx,PUSHAD_EAX ; file name |
||
1091 | call analyze_directory |
||
1092 | jc append_not_found |
||
1093 | |||
1094 | mov [sector_tmp],eax |
||
1095 | mov [entry_pos],ebx |
||
1096 | |||
1097 | test byte [ebx+11],0x10 ; is it directory? |
||
1098 | jnz append_access ; yes |
||
1099 | |||
1100 | mov ecx,[ebx+28] ; file size |
||
1101 | mov edi,PUSHAD_ESI ; write position |
||
1102 | cmp edi,-1 ; -1 = eof |
||
1103 | jnz append_inside_file |
||
1104 | mov edi,ecx ; file size |
||
1105 | |||
1106 | append_inside_file: |
||
1107 | cmp edi,ecx ; start above old file size? |
||
1108 | ja append_eof ; yes |
||
1109 | |||
1110 | mov [old_filesize],ecx |
||
1111 | mov [new_filepos],edi |
||
1112 | |||
1113 | mov ecx,PUSHAD_EBX ; bytes to write |
||
1114 | test ecx,ecx ; truncate? |
||
1115 | jz append_truncate ; yes |
||
1116 | |||
1117 | mov [bytes2write],ecx ; bytes to write |
||
1118 | mov esi,PUSHAD_ECX ; pointer to buffer |
||
1119 | mov eax,[ebx+20-2] ; FAT entry |
||
1120 | mov ax,[ebx+26] |
||
1121 | and eax,[fatMASK] |
||
1122 | jnz append_find_pos ; first cluster <> 0 |
||
1123 | |||
1124 | mov eax,2 |
||
1125 | call get_free_FAT |
||
1126 | jc append_disk_full |
||
1127 | mov ecx,eax ; set files first cluster |
||
1128 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1129 | shr ecx,16 |
||
1130 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1131 | mov edx,[fatEND] ; new end for cluster chain |
||
1132 | call set_FAT |
||
1133 | cmp [hd_error],0 |
||
1134 | jne append_access |
||
1135 | |||
1136 | push eax ; save first cluster |
||
1137 | mov eax,[sector_tmp] |
||
1138 | mov ebx,buffer |
||
1139 | call hd_write ; write new file entry back to disk |
||
1140 | cmp [hd_error],0 |
||
1141 | jne append_access_1 |
||
1142 | |||
1143 | pop eax |
||
1144 | |||
1145 | append_remove_free: |
||
1146 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1147 | call add_disk_free_space ; Note: uses buffer |
||
1148 | cmp [hd_error],0 |
||
1149 | jne append_access |
||
1150 | |||
1151 | append_found_cluster: |
||
1152 | mov [cluster],eax |
||
1153 | sub eax,2 |
||
1154 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1155 | imul eax,ecx |
||
1156 | add eax,[DATA_START] |
||
1157 | xor edi,edi |
||
1158 | |||
1159 | append_new_sector: |
||
1160 | cmp [hd_error],0 |
||
1161 | jne append_access |
||
1162 | push ecx |
||
1163 | mov ecx,[bytes2write] ; bytes left in buffer |
||
1164 | mov ebx,512 |
||
1165 | sub ebx,edi ; bytes left in sector |
||
1166 | cmp ecx,ebx |
||
1167 | jb append_bytes_ok |
||
1168 | mov ecx,ebx |
||
1169 | |||
1170 | append_bytes_ok: |
||
1171 | cmp ecx,512 ; overwrite full sector? |
||
1172 | jz append_full_sector ; yes |
||
1173 | mov ebx,buffer ; overwrite part of sector |
||
1174 | call hd_read ; read old sector |
||
1175 | cmp [hd_error],0 |
||
1176 | jne append_access_1 |
||
1177 | |||
1178 | append_full_sector: |
||
1179 | sub [bytes2write],ecx |
||
1180 | add [new_filepos],ecx |
||
1181 | add edi,buffer |
||
1182 | cld |
||
1183 | rep movsb |
||
1184 | pop ecx |
||
1185 | |||
1186 | mov ebx,buffer |
||
1187 | call hd_write |
||
1188 | cmp [hd_error],0 |
||
1189 | jne append_access |
||
1190 | |||
1191 | cmp [bytes2write],0 ; is all done? |
||
1192 | jz append_done |
||
1193 | xor edi,edi |
||
1194 | inc eax |
||
1195 | dec ecx |
||
1196 | jnz append_new_sector |
||
1197 | |||
1198 | mov eax,[cluster] |
||
1199 | call get_FAT |
||
1200 | cmp [hd_error],0 |
||
1201 | jne append_access |
||
1202 | |||
1203 | cmp eax,2 |
||
1204 | jb append_fat |
||
1205 | cmp eax,[LAST_CLUSTER] |
||
1206 | jbe append_found_cluster |
||
1207 | |||
1208 | append_alloc_cluster: |
||
1209 | mov eax,2 ; ToDo: use temp array to keep track |
||
1210 | call get_free_FAT ; of last free cluster |
||
1211 | jc append_disk_full |
||
1212 | push eax ; save new cluster |
||
1213 | mov edx,[fatEND] ; new end for cluster chain |
||
1214 | call set_FAT |
||
1215 | cmp [hd_error],0 |
||
1216 | jne append_access_1 |
||
1217 | |||
1218 | mov edx,eax |
||
1219 | mov eax,[cluster] |
||
1220 | call set_FAT ; update previous cluster |
||
1221 | cmp [hd_error],0 |
||
1222 | jne append_access_1 |
||
1223 | |||
1224 | pop eax |
||
1225 | jmp append_remove_free |
||
1226 | |||
1227 | append_find_pos: |
||
1228 | call find_filepos |
||
1229 | mov [cluster],ebx |
||
1230 | jnc append_new_sector |
||
1231 | test edi,edi |
||
1232 | jz append_alloc_cluster |
||
1233 | |||
1234 | append_fat: |
||
1235 | mov eax,ERROR_FAT_TABLE |
||
1236 | jmp append_ret_code |
||
1237 | |||
1238 | append_disk_full: |
||
1239 | cmp [hd_error],0 |
||
1240 | jne append_access |
||
1241 | mov eax,ERROR_DISK_FULL |
||
1242 | jmp append_ret_code |
||
1243 | |||
1244 | append_done: |
||
1245 | xor eax,eax |
||
1246 | |||
1247 | append_ret_code: |
||
1248 | mov PUSHAD_EAX,eax ; return code |
||
1249 | |||
1250 | mov eax,[sector_tmp] ; update directory entry |
||
1251 | mov ebx,buffer |
||
1252 | call hd_read |
||
1253 | cmp [hd_error],0 |
||
1254 | jne append_access |
||
1255 | |||
1256 | mov ebx,[entry_pos] |
||
1257 | mov ecx,[new_filepos] |
||
1258 | cmp ecx,[old_filesize] ; is file pos above old size? |
||
1259 | jbe append_size_ok ; no |
||
1260 | mov [ebx+28],ecx ; new file size |
||
1261 | |||
1262 | append_size_ok: |
||
1263 | call set_current_time_for_entry |
||
1264 | mov ebx,buffer |
||
1265 | call hd_write ; write new file entry back to disk |
||
1266 | cmp [hd_error],0 |
||
1267 | jne append_access |
||
1268 | |||
1269 | sub ecx,PUSHAD_ESI ; start position |
||
1270 | mov PUSHAD_EBX,ecx ; bytes written |
||
1271 | popad |
||
1272 | call update_disk ; write all of cache and fat to hd |
||
1273 | cmp [hd_error],0 |
||
1274 | jne append_access_2 |
||
1275 | |||
1276 | mov [hd1_status],0 |
||
1277 | ret |
||
1278 | |||
1279 | append_eof: |
||
1280 | popad |
||
1281 | mov [hd1_status],0 |
||
1282 | xor ebx,ebx |
||
1283 | mov eax,ERROR_END_OF_FILE |
||
1284 | ret |
||
1285 | |||
1286 | append_not_found: |
||
1287 | cmp [hd_error],0 |
||
1288 | jne append_access |
||
1289 | popad |
||
1290 | mov [hd1_status],0 |
||
1291 | xor ebx,ebx |
||
1292 | mov eax,ERROR_FILE_NOT_FOUND |
||
1293 | ret |
||
1294 | append_access_1: |
||
1295 | add esp,4 |
||
1296 | append_access: |
||
1297 | popad |
||
1298 | append_access_2: |
||
1299 | mov [hd1_status],0 |
||
1300 | xor ebx,ebx |
||
1301 | mov eax,ERROR_ACCESS_DENIED |
||
1302 | ret |
||
1303 | |||
1304 | append_truncate: |
||
1305 | mov edx,[ebx+20-2] ; FAT entry |
||
1306 | mov dx,[ebx+26] |
||
1307 | and edx,[fatMASK] |
||
1308 | mov [ebx+28],edi ; set new file size |
||
1309 | test edi,edi ; 0 length file? |
||
1310 | jnz truncate_save_size ; no |
||
1311 | mov [ebx+20],di ; FAT entry = 0 |
||
1312 | mov [ebx+26],di |
||
1313 | |||
1314 | truncate_save_size: |
||
1315 | call set_current_time_for_entry |
||
1316 | mov ebx,buffer |
||
1317 | call hd_write |
||
1318 | cmp [hd_error],0 |
||
1319 | jne append_access |
||
1320 | |||
1321 | mov eax,edx ; first cluster |
||
1322 | test edi,edi ; 0 length file? |
||
1323 | jz truncate_clear_chain |
||
1324 | |||
1325 | imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes |
||
1326 | |||
1327 | truncate_new_cluster: |
||
1328 | cmp eax,2 ; incorrect fat chain? |
||
1329 | jb truncate_eof ; yes |
||
1330 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1331 | jnb truncate_eof ; yes |
||
1332 | sub edi,esi |
||
1333 | jbe truncate_pos_found |
||
1334 | call get_FAT ; get next cluster |
||
1335 | cmp [hd_error],0 |
||
1336 | jne append_access |
||
1337 | |||
1338 | jmp truncate_new_cluster |
||
1339 | |||
1340 | truncate_pos_found: |
||
1341 | mov edx,[fatEND] ; new end for cluster chain |
||
1342 | call set_FAT |
||
1343 | cmp [hd_error],0 |
||
1344 | jne append_access |
||
1345 | |||
1346 | mov eax,edx ; clear rest of chain |
||
1347 | |||
1348 | truncate_clear_chain: |
||
1349 | call clear_cluster_chain |
||
1350 | cmp [hd_error],0 |
||
1351 | jne append_access |
||
1352 | |||
1353 | truncate_eof: |
||
1354 | popad |
||
1355 | call update_disk ; write all of cache and fat to hd |
||
1356 | cmp [hd_error],0 |
||
1357 | jne append_access_2 |
||
1358 | |||
1359 | mov [hd1_status],0 |
||
1360 | xor ebx,ebx |
||
1361 | xor eax,eax |
||
1362 | ret |
||
1363 | |||
1364 | |||
1365 | find_filepos: |
||
1366 | ;----------------------------------------------------- |
||
1367 | ; input : eax = first cluster |
||
1368 | ; edi = bytes to skip over (start position) |
||
1369 | ; output : if CARRY=0 file position found |
||
1370 | ; if CARRY=1 end of file found |
||
1371 | ; eax = current file sector |
||
1372 | ; ebx = last cluster |
||
1373 | ; ecx = sector count in last cluster |
||
1374 | ; edi = bytes to skip over (sector position) |
||
1375 | ;----------------------------------------------------- |
||
1376 | push esi |
||
1377 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1378 | imul esi,ecx,512 ; esi = cluster size in bytes |
||
1379 | mov ebx,eax |
||
1380 | |||
1381 | filepos_new_cluster: |
||
1382 | cmp eax,2 ; incorrect fat chain? |
||
1383 | jb filepos_eof ; yes |
||
1384 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1385 | jnb filepos_eof ; yes |
||
1386 | |||
1387 | mov ebx,eax |
||
1388 | cmp edi,esi ; skip over full cluster? |
||
1389 | jb filepos_cluster_ok ; no |
||
1390 | |||
1391 | sub edi,esi |
||
1392 | call get_FAT ; get next cluster |
||
1393 | cmp [hd_error],0 |
||
1394 | jne filepos_eof |
||
1395 | |||
1396 | jmp filepos_new_cluster |
||
1397 | |||
1398 | filepos_cluster_ok: |
||
1399 | sub eax,2 |
||
1400 | imul eax,ecx |
||
1401 | add eax,[DATA_START] |
||
1402 | |||
1403 | filepos_new_sector: |
||
1404 | cmp edi,512 ; skip over full sector? |
||
1405 | jb filepos_sector_ok ; no |
||
1406 | sub edi,512 |
||
1407 | inc eax |
||
1408 | dec ecx |
||
1409 | jnz filepos_new_sector |
||
1410 | |||
1411 | filepos_eof: |
||
1412 | pop esi |
||
1413 | stc |
||
1414 | ret |
||
1415 | |||
1416 | filepos_sector_ok: |
||
1417 | pop esi |
||
1418 | clc |
||
1419 | ret |
||
1420 | |||
1421 | |||
1422 | file_write: |
||
1423 | ;-------------------------------------------------------------------------- |
||
1424 | ; INPUT : user-reg register-in-this meaning symbol-in-this-routine |
||
1425 | ; |
||
1426 | ; EAX EDI system call to write / |
||
1427 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1428 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1429 | ; ECX EBX (PAR2) file size PAR2 |
||
1430 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1431 | ; |
||
1432 | ; output : eax = 0 - ok |
||
1433 | ; 3 - unknown FS |
||
1434 | ; 5 - file not found |
||
1435 | ; 8 - disk full |
||
1436 | ; 10 - access denied |
||
1437 | ;-------------------------------------------------------------------------- |
||
1438 | cmp [fat_type],0 |
||
1439 | jnz fat_ok_for_writing |
||
1440 | mov eax,ERROR_UNKNOWN_FS |
||
1441 | ret |
||
1442 | |||
1443 | fat_ok_for_writing: |
||
1444 | ; call reserve_hd1 |
||
1445 | |||
1446 | pushad |
||
1447 | |||
1448 | xor edi,edi ; don't allow directory remove |
||
1449 | call file_delete ; try to delete the file first |
||
1450 | cmp [hd_error],0 |
||
1451 | jne exit_write_access_1 |
||
1452 | |||
1453 | test eax,eax |
||
1454 | jz old_deleted ; deleted ok |
||
1455 | cmp eax,ERROR_FILE_NOT_FOUND |
||
1456 | jnz exit_write_access ; it exist but can't delete |
||
1457 | |||
1458 | old_deleted: |
||
1459 | mov ebx,PUSHAD_EDX |
||
1460 | call get_cluster_of_a_path |
||
1461 | jnc found_directory_for_writing |
||
1462 | cmp [hd_error],0 |
||
1463 | jne exit_write_access |
||
1464 | |||
1465 | exit_writing_with_error: |
||
1466 | popad |
||
1467 | call update_disk ; write all of cache and fat to hd |
||
1468 | cmp [hd_error],0 |
||
1469 | jne exit_write_access_2 |
||
1470 | |||
1471 | mov [hd1_status],0 |
||
1472 | mov eax,ERROR_FILE_NOT_FOUND |
||
1473 | ret |
||
1474 | |||
1475 | exit_writing_disk_full_clear: |
||
1476 | cmp [hd_error],0 |
||
1477 | jne exit_write_access_1 |
||
1478 | mov eax,[sector_tmp] |
||
1479 | mov ebx,buffer |
||
1480 | call hd_read ; read directory sector |
||
1481 | cmp [hd_error],0 |
||
1482 | jne exit_write_access_1 |
||
1483 | |||
1484 | mov edx,[entry_pos] |
||
1485 | mov byte [edx],0xe5 ; mark as deleted |
||
1486 | call hd_write |
||
1487 | cmp [hd_error],0 |
||
1488 | jne exit_write_access_1 |
||
1489 | |||
1490 | mov eax,[edx+20-2] ; FAT entry |
||
1491 | mov ax,[edx+26] |
||
1492 | and eax,[fatMASK] |
||
1493 | call clear_cluster_chain |
||
1494 | |||
1495 | exit_writing_disk_full: |
||
1496 | cmp [hd_error],0 |
||
1497 | jne exit_write_access_1 |
||
1498 | popad |
||
1499 | call update_disk ; write all of cache and fat to hd |
||
1500 | cmp [hd_error],0 |
||
1501 | jne exit_write_access_2 |
||
1502 | mov [hd1_status],0 |
||
1503 | mov eax,ERROR_DISK_FULL |
||
1504 | ret |
||
1505 | |||
1506 | exit_write_access: |
||
1507 | popad |
||
1508 | call update_disk ; write all of cache and fat to hd |
||
1509 | mov [hd1_status],0 |
||
1510 | mov eax,ERROR_ACCESS_DENIED |
||
1511 | ret |
||
1512 | |||
1513 | exit_write_access_1: |
||
1514 | popad |
||
1515 | exit_write_access_2: |
||
1516 | mov [hd1_status],0 |
||
1517 | mov eax,ERROR_ACCESS_DENIED |
||
1518 | ret |
||
1519 | |||
1520 | found_directory_for_writing: |
||
1521 | call analyze_directory_to_write |
||
1522 | jc exit_writing_disk_full |
||
1523 | |||
1524 | mov [sector_tmp],eax |
||
1525 | mov [entry_pos],ebx |
||
1526 | push eax ; save directory sector |
||
1527 | mov eax,2 |
||
1528 | call get_free_FAT |
||
1529 | mov [cluster],eax ; first free cluster |
||
1530 | pop eax |
||
1531 | jc exit_writing_disk_full |
||
1532 | |||
1533 | mov esi,PUSHAD_EAX ; file name |
||
1534 | mov edi,ebx ; pointer in buffer |
||
1535 | mov ecx,11 |
||
1536 | cld |
||
1537 | rep movsb |
||
1538 | |||
1539 | mov esi,PUSHAD_EBX ; file size (bytes left) |
||
1540 | mov [ebx+28],esi ; file size |
||
1541 | mov ecx,[cluster] |
||
1542 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1543 | shr ecx,16 |
||
1544 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1545 | mov byte [ebx+11],0x20 ; attribute = archive |
||
1546 | |||
1547 | call set_current_time_for_entry |
||
1548 | |||
1549 | mov ebx,buffer ; save the directory name,length,cluster |
||
1550 | call hd_write |
||
1551 | cmp [hd_error],0 |
||
1552 | jne exit_write_access_1 |
||
1553 | |||
1554 | imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes |
||
1555 | xor ecx,ecx ; cluster count |
||
1556 | mov ebx,PUSHAD_ECX ; ebx = buffer |
||
1557 | |||
1558 | hd_new_block_write: |
||
1559 | |||
1560 | mov eax,[cluster] ; eax = block |
||
1561 | call set_data_cluster |
||
1562 | cmp [hd_error],0 |
||
1563 | jne exit_write_access_1 |
||
1564 | |||
1565 | sub esi,edi ; sub wrote bytes |
||
1566 | jbe file_saved_OK ; end if all done |
||
1567 | add ebx,edi ; update buffer position |
||
1568 | |||
1569 | inc eax |
||
1570 | call get_free_FAT ; next free in FAT |
||
1571 | jc exit_writing_disk_full_clear |
||
1572 | |||
1573 | mov edx,eax |
||
1574 | xchg eax,[cluster] ; get old cluster and save new cluster |
||
1575 | call set_FAT ; add it in cluster chain |
||
1576 | cmp [hd_error],0 |
||
1577 | jne exit_write_access_1 |
||
1578 | |||
1579 | dec ecx ; update cluster count |
||
1580 | jmp hd_new_block_write |
||
1581 | |||
1582 | file_saved_OK: |
||
1583 | |||
1584 | mov edx,[fatEND] ; new end for cluster chain |
||
1585 | call set_FAT |
||
1586 | cmp [hd_error],0 |
||
1587 | jne exit_write_access_1 |
||
1588 | |||
1589 | dec ecx ; update cluster count |
||
1590 | |||
1591 | call add_disk_free_space ; remove clusters from free disk space |
||
1592 | cmp [hd_error],0 |
||
1593 | jne exit_write_access_1 |
||
1594 | |||
1595 | popad |
||
1596 | call update_disk ; write all of cache and fat to hd |
||
1597 | cmp [hd_error],0 |
||
1598 | jne exit_write_access_2 |
||
1599 | mov [hd1_status],0 |
||
1600 | xor eax,eax |
||
1601 | ret |
||
1602 | |||
1603 | |||
1604 | file_read: |
||
1605 | ;-------------------------------------------------------------------------- |
||
1606 | ; INPUT : user-register register-in-this meaning symbol-in-this |
||
1607 | ; |
||
1608 | ; EAX EDI system call to write / |
||
1609 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1610 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1611 | ; ECX EBX (PAR2) vt file blocks to read PAR2 |
||
1612 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1613 | ; EDI ESI vt first 512 block to read |
||
1614 | ; EDI if 0 - read root |
||
1615 | ; |
||
1616 | ; output : eax = 0 - ok |
||
1617 | ; 3 - unknown FS |
||
1618 | ; 5 - file not found |
||
1619 | ; 6 - end of file |
||
1620 | ; 9 - fat table corrupted |
||
1621 | ; 10 - access denied |
||
1622 | ; ebx = size of file/directory |
||
1623 | ;-------------------------------------------------------------------------- |
||
1624 | cmp [fat_type],0 |
||
1625 | jnz fat_ok_for_reading |
||
1626 | xor ebx,ebx |
||
1627 | mov eax,ERROR_UNKNOWN_FS |
||
1628 | mov [hd1_status], ebx |
||
1629 | ret |
||
1630 | |||
1631 | fat_ok_for_reading: |
||
1632 | ; call reserve_hd1 |
||
1633 | |||
1634 | pushad |
||
1635 | |||
1636 | mov ebx,edx |
||
1637 | call get_cluster_of_a_path |
||
1638 | jc file_to_read_not_found |
||
1639 | |||
1640 | test edi,edi ; read rootdir |
||
1641 | jne no_read_root |
||
1642 | |||
1643 | xor eax,eax |
||
1644 | call get_dir_size ; return rootdir size |
||
1645 | cmp [hd_error],0 |
||
1646 | jne file_access_denied |
||
1647 | |||
1648 | mov [file_size],eax |
||
1649 | mov eax,[ROOT_CLUSTER] |
||
1650 | jmp file_read_start |
||
1651 | |||
1652 | no_read_root: |
||
1653 | mov ebx,PUSHAD_EAX ; file name |
||
1654 | call analyze_directory |
||
1655 | jc file_to_read_not_found |
||
1656 | |||
1657 | mov eax,[ebx+28] ; file size |
||
1658 | test byte [ebx+11],0x10 ; is it directory? |
||
1659 | jz read_set_size ; no |
||
1660 | |||
1661 | mov eax,[ebx+20-2] ; FAT entry |
||
1662 | mov ax,[ebx+26] |
||
1663 | and eax,[fatMASK] |
||
1664 | call get_dir_size |
||
1665 | cmp [hd_error],0 |
||
1666 | jne file_access_denied |
||
1667 | |||
1668 | read_set_size: |
||
1669 | mov [file_size],eax |
||
1670 | |||
1671 | mov eax,[ebx+20-2] ; FAT entry |
||
1672 | mov ax,[ebx+26] |
||
1673 | and eax,[fatMASK] |
||
1674 | |||
1675 | file_read_start: |
||
1676 | mov ebx,PUSHAD_ECX ; pointer to buffer |
||
1677 | mov edx,PUSHAD_EBX ; file blocks to read |
||
1678 | mov esi,PUSHAD_ESI ; first 512 block to read |
||
1679 | |||
1680 | file_read_new_cluster: |
||
1681 | call get_data_cluster |
||
1682 | jc file_read_eof ; end of file or cluster out of range |
||
1683 | |||
1684 | test edx,edx ; is all read? |
||
1685 | je file_read_OK ; yes |
||
1686 | |||
1687 | call get_FAT ; get next cluster |
||
1688 | cmp [hd_error],0 |
||
1689 | jne file_access_denied |
||
1690 | |||
1691 | cmp eax,[fatRESERVED] ; end of file |
||
1692 | jnb file_read_eof |
||
1693 | cmp eax,2 ; incorrect fat chain |
||
1694 | jnb file_read_new_cluster |
||
1695 | |||
1696 | popad |
||
1697 | mov [hd1_status],0 |
||
1698 | mov ebx,[file_size] |
||
1699 | mov eax,ERROR_FAT_TABLE |
||
1700 | ret |
||
1701 | |||
1702 | file_read_eof: |
||
1703 | cmp [hd_error],0 |
||
1704 | jne file_access_denied |
||
1705 | popad |
||
1706 | mov [hd1_status],0 |
||
1707 | mov ebx,[file_size] |
||
1708 | mov eax,ERROR_END_OF_FILE |
||
1709 | ret |
||
1710 | |||
1711 | file_read_OK: |
||
1712 | popad |
||
1713 | mov [hd1_status],0 |
||
1714 | mov ebx,[file_size] |
||
1715 | xor eax,eax |
||
1716 | ret |
||
1717 | |||
1718 | file_to_read_not_found: |
||
1719 | cmp [hd_error],0 |
||
1720 | jne file_access_denied |
||
1721 | popad |
||
1722 | mov [hd1_status],0 |
||
1723 | xor ebx,ebx |
||
1724 | mov eax,ERROR_FILE_NOT_FOUND |
||
1725 | ret |
||
1726 | |||
1727 | file_access_denied: |
||
1728 | popad |
||
1729 | mov [hd1_status],0 |
||
1730 | xor ebx,ebx |
||
1731 | mov eax,ERROR_ACCESS_DENIED |
||
1732 | ret |
||
1733 | |||
1734 | get_dir_size: |
||
1735 | ;----------------------------------------------------- |
||
1736 | ; input : eax = first cluster (0=rootdir) |
||
1737 | ; output : eax = directory size in bytes |
||
1738 | ;----------------------------------------------------- |
||
1739 | push edx |
||
1740 | xor edx,edx ; count of directory clusters |
||
1741 | test eax,eax |
||
1742 | jnz dir_size_next |
||
1743 | |||
1744 | mov eax,[ROOT_SECTORS] |
||
1745 | shl eax,9 ; fat16 rootdir size in bytes |
||
1746 | cmp [fat_type],16 |
||
1747 | je dir_size_ret |
||
1748 | mov eax,[ROOT_CLUSTER] |
||
1749 | |||
1750 | dir_size_next: |
||
1751 | cmp eax,2 ; incorrect fat chain |
||
1752 | jb dir_size_end |
||
1753 | cmp eax,[fatRESERVED] ; end of directory |
||
1754 | ja dir_size_end |
||
1755 | call get_FAT ; get next cluster |
||
1756 | cmp [hd_error],0 |
||
1757 | jne dir_size_ret |
||
1758 | |||
1759 | inc edx |
||
1760 | jmp dir_size_next |
||
1761 | |||
1762 | dir_size_end: |
||
1763 | imul eax,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
1764 | imul eax,edx |
||
1765 | |||
1766 | dir_size_ret: |
||
1767 | pop edx |
||
1768 | ret |
||
1769 | |||
1770 | |||
1771 | file_delete: |
||
1772 | ;----------------------------------------------------- |
||
1773 | ; input : eax = file/directory name |
||
1774 | ; edx = path |
||
1775 | ; edi = 1 - allow directory remove else don't remove directory |
||
1776 | ; output : eax = 0 - ok |
||
1777 | ; 3 - unknown FS |
||
1778 | ; 5 - file not found |
||
1779 | ; 10 - access denied |
||
1780 | ;----------------------------------------------------- |
||
1781 | cmp [fat_type],0 |
||
1782 | jnz file_del_fat_ok |
||
1783 | mov eax,ERROR_UNKNOWN_FS |
||
1784 | ret |
||
1785 | |||
1786 | file_del_fat_ok: |
||
1787 | pushad |
||
1788 | |||
1789 | mov ebx,edx |
||
1790 | call get_cluster_of_a_path |
||
1791 | jc file_to_delete_not_found |
||
1792 | |||
1793 | mov ebx,PUSHAD_EAX ; file/directory name |
||
1794 | call analyze_directory |
||
1795 | jc file_to_delete_not_found |
||
1796 | |||
1797 | test byte [ebx+11],0x10 ; is it directory? |
||
1798 | jz delete_notdir ; no. it's file |
||
1799 | cmp edi,1 ; allow directory remove |
||
1800 | jnz delete_no_access ; no |
||
1801 | |||
1802 | push eax ; save directory sector |
||
1803 | mov eax,[ebx+20-2] ; first cluster of file |
||
1804 | mov ax,[ebx+26] ; 0 length files start cluster = 0 |
||
1805 | and eax,[fatMASK] |
||
1806 | xor ebp,ebp ; counter for directory deepnes |
||
1807 | call clear_directory |
||
1808 | pop eax |
||
1809 | jc delete_no_access |
||
1810 | |||
1811 | push ebx ; save directory pointer in buffer |
||
1812 | mov ebx,buffer |
||
1813 | call hd_read ; read directory sector |
||
1814 | cmp [hd_error],0 |
||
1815 | jne delete_no_access_1 |
||
1816 | pop ebx |
||
1817 | |||
1818 | delete_notdir: |
||
1819 | call delete_entry_name |
||
1820 | cmp [hd_error],0 |
||
1821 | jne delete_no_access |
||
1822 | |||
1823 | mov eax,ecx ; first cluster of file |
||
1824 | call clear_cluster_chain |
||
1825 | cmp [hd_error],0 |
||
1826 | jne delete_no_access |
||
1827 | |||
1828 | popad |
||
1829 | xor eax,eax |
||
1830 | ret |
||
1831 | |||
1832 | delete_no_access_1: |
||
1833 | add esp,4 |
||
1834 | delete_no_access: |
||
1835 | popad |
||
1836 | mov eax,ERROR_ACCESS_DENIED |
||
1837 | ret |
||
1838 | |||
1839 | file_to_delete_not_found: |
||
1840 | cmp [hd_error],0 |
||
1841 | jne delete_no_access |
||
1842 | popad |
||
1843 | mov eax,ERROR_FILE_NOT_FOUND |
||
1844 | ret |
||
1845 | |||
1846 | |||
1847 | clear_cluster_chain: |
||
1848 | ;----------------------------------------------------- |
||
1849 | ; input : eax = first cluster |
||
1850 | ;----------------------------------------------------- |
||
1851 | push eax ecx edx |
||
1852 | xor ecx,ecx ; cluster count |
||
1853 | |||
1854 | clean_new_chain: |
||
1855 | cmp eax,[LAST_CLUSTER] ; end of file |
||
1856 | ja delete_OK |
||
1857 | cmp eax,2 ; unfinished fat chain or zero length file |
||
1858 | jb delete_OK |
||
1859 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1860 | jz delete_OK |
||
1861 | |||
1862 | xor edx,edx |
||
1863 | call set_FAT ; clear fat entry |
||
1864 | cmp [hd_error],0 |
||
1865 | jne access_denied_01 |
||
1866 | |||
1867 | inc ecx ; update cluster count |
||
1868 | mov eax,edx ; old cluster |
||
1869 | jmp clean_new_chain |
||
1870 | |||
1871 | delete_OK: |
||
1872 | call add_disk_free_space ; add clusters to free disk space |
||
1873 | access_denied_01: |
||
1874 | pop edx ecx eax |
||
1875 | ret |
||
1876 | |||
1877 | |||
1878 | clear_directory: |
||
1879 | ;----------------------------------------------------- |
||
1880 | ; input : eax = directory cluster |
||
1881 | ; ebp = directory deepnes |
||
1882 | ; Note : use recursive call |
||
1883 | ;----------------------------------------------------- |
||
1884 | pushad |
||
1885 | inc ebp |
||
1886 | cmp ebp,64 ; if over 63 directory deep |
||
1887 | jnb clear_error ; something must be wrong |
||
1888 | |||
1889 | clear_new_cluster: |
||
1890 | cmp eax,[LAST_CLUSTER] |
||
1891 | ja clear_end |
||
1892 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1893 | jz clear_end |
||
1894 | mov esi,eax ; esi = current directory cluster |
||
1895 | sub eax,2 |
||
1896 | jb clear_end |
||
1897 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1898 | imul eax,ecx |
||
1899 | add eax,[DATA_START] |
||
1900 | |||
1901 | clear_new_sector: |
||
1902 | mov edi,eax ; edi = current directory sector |
||
1903 | mov ebx,deltree_buffer |
||
1904 | call hd_read |
||
1905 | cmp [hd_error],0 |
||
1906 | jne clear_error |
||
1907 | |||
1908 | mov edx,512/32 ; count of dir entrys per sector = 16 |
||
1909 | |||
1910 | clear_analyze: |
||
1911 | mov al,[ebx+11] ; file attribute |
||
1912 | and al,0xf |
||
1913 | cmp al,0xf |
||
1914 | je clear_long_filename |
||
1915 | |||
1916 | cmp byte [ebx],'.' ; parent or current directory |
||
1917 | je clear_next_entry |
||
1918 | cmp byte [ebx],0xe5 ; deleted |
||
1919 | je clear_next_entry |
||
1920 | cmp byte [ebx],0 ; empty |
||
1921 | je clear_write_last |
||
1922 | ;je clear_next_entry |
||
1923 | |||
1924 | mov eax,[ebx+20-2] ; first cluster of entry |
||
1925 | mov ax,[ebx+26] |
||
1926 | and eax,[fatMASK] |
||
1927 | |||
1928 | test byte [ebx+11],0x10 ; is it directory? |
||
1929 | jz clear_file ; no |
||
1930 | |||
1931 | push eax ebx |
||
1932 | mov eax,edi |
||
1933 | mov ebx,deltree_buffer ; save buffer over recursive call |
||
1934 | call hd_write ; write directory sector to disk |
||
1935 | cmp [hd_error],0 |
||
1936 | jne clear_error |
||
1937 | |||
1938 | pop ebx eax |
||
1939 | |||
1940 | call clear_directory ; recursive call !!! |
||
1941 | jc clear_error ; exit if error found |
||
1942 | |||
1943 | push eax ebx |
||
1944 | mov eax,edi |
||
1945 | mov ebx,deltree_buffer |
||
1946 | call hd_read ; read directory sector again |
||
1947 | cmp [hd_error],0 |
||
1948 | jne clear_error_1 |
||
1949 | |||
1950 | pop ebx eax |
||
1951 | |||
1952 | clear_file: |
||
1953 | call clear_cluster_chain |
||
1954 | cmp [hd_error],0 |
||
1955 | jne clear_error |
||
1956 | |||
1957 | clear_long_filename: |
||
1958 | mov byte [ebx],0xe5 |
||
1959 | |||
1960 | clear_next_entry: |
||
1961 | add ebx,32 ; position of next dir entry |
||
1962 | dec edx |
||
1963 | jnz clear_analyze |
||
1964 | |||
1965 | mov eax,edi |
||
1966 | mov ebx,deltree_buffer |
||
1967 | call hd_write ; write directory sector to disk |
||
1968 | cmp [hd_error],0 |
||
1969 | jne clear_error |
||
1970 | |||
1971 | inc eax ; next sector |
||
1972 | dec ecx |
||
1973 | jnz clear_new_sector |
||
1974 | |||
1975 | mov eax,esi |
||
1976 | call get_FAT ; get next cluster |
||
1977 | cmp [hd_error],0 |
||
1978 | jne clear_error |
||
1979 | |||
1980 | jmp clear_new_cluster ; clear it |
||
1981 | |||
1982 | clear_write_last: |
||
1983 | mov eax,edi |
||
1984 | mov ebx,deltree_buffer |
||
1985 | call hd_write ; write directory sector to disk |
||
1986 | cmp [hd_error],0 |
||
1987 | jne clear_error |
||
1988 | |||
1989 | clear_end: |
||
1990 | popad |
||
1991 | clc |
||
1992 | ret |
||
1993 | clear_error_1: |
||
1994 | add esp,8 |
||
1995 | clear_error: |
||
1996 | popad |
||
1997 | stc |
||
1998 | ret |
||
1999 | |||
2000 | |||
2001 | delete_entry_name: |
||
2002 | ;----------------------------------------------------- |
||
2003 | ; input : eax = directory sector |
||
2004 | ; ebx = directory pointer in buffer |
||
2005 | ; longname_sec = 2 previous directory sectors |
||
2006 | ; output : ecx = first cluster |
||
2007 | ; change : eax,ebx,edx |
||
2008 | ;----------------------------------------------------- |
||
2009 | mov byte [ebx],0xe5 |
||
2010 | mov ecx,[ebx+20-2] ; first cluster of file |
||
2011 | mov cx,[ebx+26] ; 0 length files start cluster = 0 |
||
2012 | and ecx,[fatMASK] |
||
2013 | |||
2014 | delete_empty: |
||
2015 | sub ebx,32 |
||
2016 | cmp ebx,buffer |
||
2017 | jnb delete_test_long |
||
2018 | |||
2019 | mov ebx,buffer |
||
2020 | call hd_write ; write directory sector back |
||
2021 | cmp [hd_error],0 |
||
2022 | jne delete_name_end |
||
2023 | |||
2024 | xor eax,eax |
||
2025 | xchg eax,[longname_sec2] |
||
2026 | xchg eax,[longname_sec1] |
||
2027 | test eax,eax ; is there previous directory sector? |
||
2028 | jz delete_name_end ; no |
||
2029 | |||
2030 | mov ebx,buffer |
||
2031 | call hd_read ; read previous sector |
||
2032 | cmp [hd_error],0 |
||
2033 | jne delete_name_end |
||
2034 | |||
2035 | mov ebx,buffer+0x1e0 ; start from last entry |
||
2036 | |||
2037 | delete_test_long: |
||
2038 | mov dh,[ebx+11] ; file attribute |
||
2039 | and dh,0xf |
||
2040 | cmp dh,0xf |
||
2041 | jne delete_write_buffer |
||
2042 | |||
2043 | cmp byte [ebx],0x40 ; end of long dir entry? |
||
2044 | mov byte [ebx],0xe5 |
||
2045 | jb delete_empty |
||
2046 | |||
2047 | delete_write_buffer: |
||
2048 | mov ebx,buffer |
||
2049 | call hd_write ; write directory sector back |
||
2050 | |||
2051 | delete_name_end: |
||
2052 | ret |
||
2053 | |||
2054 | |||
2055 | rename: |
||
2056 | ;----------------------------------------------------------- |
||
2057 | ; input : eax = source directory name |
||
2058 | ; edx = source path |
||
2059 | ; ebx = dest directory name |
||
2060 | ; edi = dest path |
||
2061 | ; output : eax = 0 - ok |
||
2062 | ; 3 - unknown FS |
||
2063 | ; 5 - file not found |
||
2064 | ; 8 - disk full |
||
2065 | ; 10 - access denied |
||
2066 | ;----------------------------------------------------------- |
||
2067 | cmp [fat_type],0 |
||
2068 | jnz fat_ok_for_rename |
||
2069 | mov eax,ERROR_UNKNOWN_FS |
||
2070 | ret |
||
2071 | |||
2072 | fat_ok_for_rename: |
||
2073 | ; call reserve_hd1 |
||
2074 | |||
2075 | pushad |
||
2076 | |||
2077 | mov ebx,edx ; source path |
||
2078 | call get_cluster_of_a_path |
||
2079 | jc rename_entry_not_found |
||
2080 | |||
2081 | mov ebx,PUSHAD_EAX ; source directory name |
||
2082 | call analyze_directory |
||
2083 | jc rename_entry_not_found |
||
2084 | |||
2085 | mov [sector_tmp],eax ; save source sector |
||
2086 | mov [entry_pos],ebx |
||
2087 | mov esi,ebx |
||
2088 | mov edi,dir_entry |
||
2089 | mov ecx,32/4 |
||
2090 | cld |
||
2091 | rep movsd ; save entry |
||
2092 | |||
2093 | mov ebx,PUSHAD_EDI ; dest path |
||
2094 | call get_cluster_of_a_path |
||
2095 | jc rename_entry_not_found |
||
2096 | |||
2097 | mov edx,eax ; save dest directory cluster |
||
2098 | mov ebx,PUSHAD_EBX ; dest directory name |
||
2099 | push [longname_sec1] |
||
2100 | push [longname_sec2] |
||
2101 | call analyze_directory ; check if entry already exist |
||
2102 | cmp [hd_error],0 |
||
2103 | jne rename_entry_already_exist_1 |
||
2104 | |||
2105 | pop [longname_sec2] |
||
2106 | pop [longname_sec1] |
||
2107 | jnc rename_entry_already_exist |
||
2108 | |||
2109 | mov eax,edx |
||
2110 | call analyze_directory_to_write |
||
2111 | jc rename_disk_full |
||
2112 | |||
2113 | mov esi,dir_entry |
||
2114 | mov edi,ebx |
||
2115 | mov ecx,32/4 |
||
2116 | cld |
||
2117 | rep movsd ; copy entry |
||
2118 | mov esi,PUSHAD_EBX ; dest directory name |
||
2119 | mov edi,ebx |
||
2120 | mov ecx,11 |
||
2121 | rep movsb ; copy name |
||
2122 | |||
2123 | mov ebx,buffer ; save the directory name,length,cluster |
||
2124 | call hd_write |
||
2125 | |||
2126 | test byte [dir_entry+11],0x10 ; is it directory? |
||
2127 | jz rename_not_dir ; no |
||
2128 | mov eax,[dir_entry+20-2] ; FAT entry |
||
2129 | mov ax,[dir_entry+26] |
||
2130 | and eax,[fatMASK] |
||
2131 | call change_2dot_cluster |
||
2132 | cmp [hd_error],0 |
||
2133 | jne rename_entry_already_exist |
||
2134 | |||
2135 | rename_not_dir: |
||
2136 | cmp [hd_error],0 |
||
2137 | jne rename_entry_already_exist |
||
2138 | mov eax,[sector_tmp] |
||
2139 | mov ebx,buffer |
||
2140 | call hd_read ; read source directory sector |
||
2141 | cmp [hd_error],0 |
||
2142 | jne rename_entry_already_exist |
||
2143 | |||
2144 | mov ebx,[entry_pos] |
||
2145 | call delete_entry_name |
||
2146 | cmp [hd_error],0 |
||
2147 | jne rename_entry_already_exist |
||
2148 | |||
2149 | popad |
||
2150 | call update_disk ; write all of cache and fat to hd |
||
2151 | cmp [hd_error],0 |
||
2152 | jne rename_entry_already_exist_2 |
||
2153 | mov [hd1_status],0 |
||
2154 | xor eax,eax |
||
2155 | ret |
||
2156 | |||
2157 | rename_entry_not_found: |
||
2158 | cmp [hd_error],0 |
||
2159 | jne rename_entry_already_exist |
||
2160 | popad |
||
2161 | mov [hd1_status],0 |
||
2162 | mov eax,ERROR_FILE_NOT_FOUND |
||
2163 | ret |
||
2164 | |||
2165 | rename_entry_already_exist_1: |
||
2166 | add esp,8 |
||
2167 | rename_entry_already_exist: |
||
2168 | popad |
||
2169 | rename_entry_already_exist_2: |
||
2170 | mov [hd1_status],0 |
||
2171 | mov eax,ERROR_ACCESS_DENIED |
||
2172 | ret |
||
2173 | |||
2174 | rename_disk_full: |
||
2175 | cmp [hd_error],0 |
||
2176 | jne rename_entry_already_exist |
||
2177 | popad |
||
2178 | mov [hd1_status],0 |
||
2179 | mov eax,ERROR_DISK_FULL |
||
2180 | ret |
||
2181 | |||
2182 | |||
2183 | change_2dot_cluster: |
||
2184 | ;----------------------------------------------------------- |
||
2185 | ; input : eax = directory cluster |
||
2186 | ; edx = value to save |
||
2187 | ; change : eax,ebx,edx |
||
2188 | ;----------------------------------------------------------- |
||
2189 | cmp eax,[LAST_CLUSTER] |
||
2190 | ja not_2dot ; too big cluster number, something is wrong |
||
2191 | sub eax,2 |
||
2192 | jb not_2dot |
||
2193 | |||
2194 | imul eax,[SECTORS_PER_CLUSTER] |
||
2195 | add eax,[DATA_START] |
||
2196 | mov ebx,buffer |
||
2197 | call hd_read |
||
2198 | cmp [hd_error],0 |
||
2199 | jne not_2dot |
||
2200 | |||
2201 | cmp dword [ebx+32],'.. ' |
||
2202 | jnz not_2dot |
||
2203 | |||
2204 | cmp edx,[ROOT_CLUSTER] ; is rootdir cluster? |
||
2205 | jne not_2dot_root |
||
2206 | xor edx,edx ; yes. set it zero |
||
2207 | |||
2208 | not_2dot_root: |
||
2209 | mov [ebx+32+26],dx ; 16 bits low of cluster |
||
2210 | shr edx,16 |
||
2211 | mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16) |
||
2212 | call hd_write |
||
2213 | |||
2214 | not_2dot: |
||
2215 | ret |
||
2216 | |||
2217 | |||
2218 | get_hd_info: |
||
2219 | ;----------------------------------------------------------- |
||
2220 | ; output : eax = 0 - ok |
||
2221 | ; 3 - unknown FS |
||
2222 | ; 10 - access denied |
||
2223 | ; edx = cluster size in bytes |
||
2224 | ; ebx = total clusters on disk |
||
2225 | ; ecx = free clusters on disk |
||
2226 | ;----------------------------------------------------------- |
||
2227 | cmp [fat_type],0 |
||
2228 | jnz info_fat_ok |
||
2229 | xor edx,edx |
||
2230 | xor ebx,ebx |
||
2231 | xor ecx,ecx |
||
2232 | mov eax,ERROR_UNKNOWN_FS |
||
2233 | ret |
||
2234 | |||
2235 | info_fat_ok: |
||
2236 | ; call reserve_hd1 |
||
2237 | |||
2238 | xor ecx,ecx ; count of free clusters |
||
2239 | mov eax,2 |
||
2240 | mov ebx,[LAST_CLUSTER] |
||
2241 | |||
2242 | info_cluster: |
||
2243 | push eax |
||
2244 | call get_FAT ; get cluster info |
||
2245 | cmp [hd_error],0 |
||
2246 | jne info_access_denied |
||
2247 | |||
2248 | test eax,eax ; is it free? |
||
2249 | jnz info_used ; no |
||
2250 | inc ecx |
||
2251 | |||
2252 | info_used: |
||
2253 | pop eax |
||
2254 | inc eax |
||
2255 | cmp eax,ebx ; is above last cluster? |
||
2256 | jbe info_cluster ; no. test next cluster |
||
2257 | |||
2258 | dec ebx ; cluster count |
||
2259 | imul edx,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
2260 | mov [hd1_status],0 |
||
2261 | xor eax,eax |
||
2262 | ret |
||
2263 | |||
2264 | info_access_denied: |
||
2265 | add esp,4 |
||
2266 | xor edx,edx |
||
2267 | xor ebx,ebx |
||
2268 | xor ecx,ecx |
||
2269 | mov eax,ERROR_ACCESS_DENIED |
||
2270 | ret |
||
2271 | |||
2272 | update_disk: |
||
2273 | ;----------------------------------------------------------- |
||
2274 | ; write changed fat and cache to disk |
||
2275 | ;----------------------------------------------------------- |
||
2276 | cmp [fat_change],0 ; is fat changed? |
||
2277 | je upd_no_change |
||
2278 | |||
2279 | call write_fat_sector |
||
2280 | cmp [hd_error],0 |
||
2281 | jne update_disk_acces_denied |
||
2282 | |||
2283 | upd_no_change: |
||
2284 | |||
2285 | call write_cache |
||
2286 | update_disk_acces_denied: |
||
2287 | ret |
||
2288 | |||
2289 | |||
2290 | ;************************************************************************** |
||
2291 | ; |
||
2292 | ; 0x600008 - first entry in cache list |
||
2293 | ; |
||
2294 | ; +0 - lba sector |
||
2295 | ; +4 - state of cache sector |
||
2296 | ; 0 = empty |
||
2297 | ; 1 = used for read ( same as in hd ) |
||
2298 | ; 2 = used for write ( differs from hd ) |
||
2299 | ; |
||
2300 | ; +65536 - cache entries |
||
2301 | ; |
||
2302 | ;************************************************************************** |
||
2303 | |||
2304 | |||
2305 | hd_read: |
||
2306 | ;----------------------------------------------------------- |
||
2307 | ; input : eax = block to read |
||
2308 | ; ebx = destination |
||
2309 | ;----------------------------------------------------------- |
||
2310 | push ecx esi edi ; scan cache |
||
2311 | |||
2312 | mov ecx,cache_max ; entries in cache |
||
2313 | mov esi,0x600000+8 |
||
2314 | mov edi,1 |
||
2315 | |||
2316 | hdreadcache: |
||
2317 | |||
2318 | cmp dword [esi+4],0 ; empty |
||
2319 | je nohdcache |
||
2320 | |||
2321 | cmp [esi],eax ; correct sector |
||
2322 | je yeshdcache |
||
2323 | |||
2324 | nohdcache: |
||
2325 | |||
2326 | add esi,8 |
||
2327 | inc edi |
||
2328 | dec ecx |
||
2329 | jnz hdreadcache |
||
2330 | |||
2331 | call find_empty_slot ; ret in edi |
||
2332 | cmp [hd_error],0 |
||
2333 | jne return_01 |
||
2334 | |||
2335 | push eax edx |
||
2336 | |||
2337 | call wait_for_hd_idle |
||
2338 | cmp [hd_error],0 |
||
2339 | jne hd_read_error |
||
2340 | |||
2341 | cli |
||
2342 | xor eax,eax |
||
2343 | mov edx,[hdbase] |
||
2344 | inc edx |
||
2345 | out dx,al ; ATAFeatures ॣ¨áâà "®á®¡¥®á⥩" |
||
2346 | inc edx |
||
2347 | inc eax |
||
2348 | out dx,al ; ATASectorCount áç¥â稪 ᥪâ®à®¢ |
||
2349 | inc edx |
||
2350 | mov eax,[esp+4] |
||
2351 | out dx,al ; ATASectorNumber ॣ¨áâà ®¬¥à ᥪâ®à |
||
2352 | shr eax,8 |
||
2353 | inc edx |
||
2354 | out dx,al ; ATACylinder ®¬¥à 樫¨¤à (¬« ¤è¨© ¡ ©â) |
||
2355 | shr eax,8 |
||
2356 | inc edx |
||
2357 | out dx,al ; ®¬¥à 樫¨¤à (áâ à訩 ¡ ©â) |
||
2358 | shr eax,8 |
||
2359 | inc edx |
||
2360 | and al,1+2+4+8 |
||
2361 | add al,byte [hdid] |
||
2362 | add al,128+64+32 |
||
2363 | out dx,al ; ®¬¥à £®«®¢ª¨/®¬¥à ¤¨áª |
||
2364 | inc edx |
||
2365 | mov al,20h |
||
2366 | out dx,al ; ATACommand ॣ¨áâà ª®¬ ¤ |
||
2367 | sti |
||
2368 | |||
2369 | call wait_for_sector_buffer |
||
2370 | |||
2371 | cmp [hd_error],0 |
||
2372 | jne hd_read_error |
||
2373 | |||
2374 | cli |
||
2375 | push edi |
||
2376 | shl edi,9 |
||
2377 | add edi,0x600000+65536 |
||
2378 | mov ecx,256 |
||
2379 | mov edx,[hdbase] |
||
2380 | cld |
||
2381 | rep insw |
||
2382 | pop edi |
||
2383 | sti |
||
2384 | |||
2385 | pop edx eax |
||
2386 | blok_read_2: |
||
2387 | lea esi,[edi*8+0x600000] |
||
2388 | mov [esi],eax ; sector number |
||
2389 | mov dword [esi+4],1 ; hd read - mark as same as in hd |
||
2390 | |||
2391 | yeshdcache: |
||
2392 | |||
2393 | mov esi,edi |
||
2394 | shl esi,9 |
||
2395 | add esi,0x600000+65536 |
||
2396 | mov edi,ebx |
||
2397 | mov ecx,512/4 |
||
2398 | cld |
||
2399 | rep movsd ; move data |
||
2400 | return_01: |
||
2401 | pop edi esi ecx |
||
2402 | ret |
||
2403 | |||
2404 | |||
2405 | hd_write: |
||
2406 | ;----------------------------------------------------------- |
||
2407 | ; input : eax = block |
||
2408 | ; ebx = pointer to memory |
||
2409 | ;----------------------------------------------------------- |
||
2410 | push ecx esi edi |
||
2411 | |||
2412 | ; check if the cache already has the sector and overwrite it |
||
2413 | |||
2414 | mov ecx,cache_max |
||
2415 | mov esi,0x600000+8 |
||
2416 | mov edi,1 |
||
2417 | |||
2418 | hdwritecache: |
||
2419 | |||
2420 | cmp dword [esi+4],0 ; if cache slot is empty |
||
2421 | je not_in_cache_write |
||
2422 | |||
2423 | cmp [esi],eax ; if the slot has the sector |
||
2424 | je yes_in_cache_write |
||
2425 | |||
2426 | not_in_cache_write: |
||
2427 | |||
2428 | add esi,8 |
||
2429 | inc edi |
||
2430 | dec ecx |
||
2431 | jnz hdwritecache |
||
2432 | |||
2433 | ; sector not found in cache |
||
2434 | ; write the block to a new location |
||
2435 | |||
2436 | call find_empty_slot ; ret in edi |
||
2437 | cmp [hd_error],0 |
||
2438 | jne hd_write_access_denied |
||
2439 | |||
2440 | lea esi,[edi*8+0x600000] |
||
2441 | mov [esi],eax ; sector number |
||
2442 | |||
2443 | yes_in_cache_write: |
||
2444 | |||
2445 | mov dword [esi+4],2 ; write - differs from hd |
||
2446 | |||
2447 | shl edi,9 |
||
2448 | add edi,0x600000+65536 |
||
2449 | mov esi,ebx |
||
2450 | mov ecx,512/4 |
||
2451 | cld |
||
2452 | rep movsd ; move data |
||
2453 | hd_write_access_denied: |
||
2454 | pop edi esi ecx |
||
2455 | ret |
||
2456 | |||
2457 | |||
2458 | write_cache: |
||
2459 | ;----------------------------------------------------------- |
||
2460 | ; write all changed sectors to disk |
||
2461 | ;----------------------------------------------------------- |
||
2462 | push eax ecx edx esi edi |
||
2463 | |||
2464 | ; write difference ( 2 ) from cache to hd |
||
2465 | |||
2466 | mov ecx,cache_max |
||
2467 | mov esi,0x600000+8 |
||
2468 | mov edi,1 |
||
2469 | |||
2470 | write_cache_more: |
||
2471 | |||
2472 | cmp dword [esi+4],2 ; if cache slot is not different |
||
2473 | jne does_not_need_writing |
||
2474 | |||
2475 | mov dword [esi+4],1 ; same as in hd |
||
2476 | mov eax,[esi] ; eax = sector to write |
||
2477 | |||
2478 | cmp eax,[PARTITION_START] |
||
2479 | jb danger |
||
2480 | cmp eax,[PARTITION_END] |
||
2481 | ja danger |
||
2482 | |||
2483 | call wait_for_hd_idle |
||
2484 | cmp [hd_error],0 |
||
2485 | jne hd_write_error |
||
2486 | |||
2487 | cli |
||
2488 | xor eax,eax |
||
2489 | mov edx,[hdbase] |
||
2490 | inc edx |
||
2491 | out dx,al |
||
2492 | inc edx |
||
2493 | inc eax |
||
2494 | out dx,al |
||
2495 | inc edx |
||
2496 | mov eax,[esi] ; eax = sector to write |
||
2497 | out dx,al |
||
2498 | shr eax,8 |
||
2499 | inc edx |
||
2500 | out dx,al |
||
2501 | shr eax,8 |
||
2502 | inc edx |
||
2503 | out dx,al |
||
2504 | shr eax,8 |
||
2505 | inc edx |
||
2506 | and al,1+2+4+8 |
||
2507 | add al,byte [hdid] |
||
2508 | add al,128+64+32 |
||
2509 | out dx,al |
||
2510 | inc edx |
||
2511 | mov al,30h |
||
2512 | out dx,al |
||
2513 | sti |
||
2514 | |||
2515 | call wait_for_sector_buffer |
||
2516 | |||
2517 | cmp [hd_error],0 |
||
2518 | jne hd_write_error |
||
2519 | |||
2520 | push ecx esi |
||
2521 | |||
2522 | cli |
||
2523 | mov esi,edi |
||
2524 | shl esi,9 |
||
2525 | add esi,0x600000+65536 ; esi = from memory position |
||
2526 | mov ecx,256 |
||
2527 | mov edx,[hdbase] |
||
2528 | cld |
||
2529 | rep outsw |
||
2530 | sti |
||
2531 | |||
2532 | pop esi ecx |
||
2533 | |||
2534 | danger: |
||
2535 | does_not_need_writing: |
||
2536 | |||
2537 | add esi,8 |
||
2538 | inc edi |
||
2539 | dec ecx |
||
2540 | jnz write_cache_more |
||
2541 | return_02: |
||
2542 | pop edi esi edx ecx eax |
||
2543 | ret |
||
2544 | |||
2545 | |||
2546 | find_empty_slot: |
||
2547 | ;----------------------------------------------------------- |
||
2548 | ; find empty or read slot, flush cache if next 10% is used by write |
||
2549 | ; output : edi = cache slot |
||
2550 | ;----------------------------------------------------------- |
||
2551 | push ecx esi |
||
2552 | |||
2553 | search_again: |
||
2554 | |||
2555 | mov ecx,cache_max*10/100 |
||
2556 | mov edi,[cache_search_start] |
||
2557 | |||
2558 | search_for_empty: |
||
2559 | |||
2560 | inc edi |
||
2561 | cmp edi,cache_max |
||
2562 | jbe inside_cache |
||
2563 | mov edi,1 |
||
2564 | |||
2565 | inside_cache: |
||
2566 | |||
2567 | cmp dword [edi*8+0x600000+4],2 ; get cache slot info |
||
2568 | jb found_slot ; it's empty or read |
||
2569 | dec ecx |
||
2570 | jnz search_for_empty |
||
2571 | |||
2572 | call write_cache ; no empty slots found, write all |
||
2573 | cmp [hd_error],0 |
||
2574 | jne found_slot_access_denied |
||
2575 | |||
2576 | jmp search_again ; and start again |
||
2577 | |||
2578 | found_slot: |
||
2579 | |||
2580 | mov [cache_search_start],edi |
||
2581 | found_slot_access_denied: |
||
2582 | pop esi ecx |
||
2583 | ret |
||
2584 | |||
2585 | |||
2586 | save_hd_wait_timeout: |
||
2587 | |||
2588 | push eax |
||
2589 | mov eax,[timer_ticks];[0xfdf0] |
||
2590 | add eax,300 ; 3 sec timeout |
||
2591 | mov [hd_wait_timeout],eax |
||
2592 | pop eax |
||
2593 | ret |
||
2594 | |||
2595 | |||
2596 | check_hd_wait_timeout: |
||
2597 | |||
2598 | push eax |
||
2599 | mov eax,[hd_wait_timeout] |
||
2600 | cmp [timer_ticks], eax ;[0xfdf0],eax |
||
2601 | jg hd_timeout_error |
||
2602 | pop eax |
||
2603 | mov [hd_error],0 |
||
2604 | ret |
||
2605 | |||
2606 | iglobal |
||
2607 | hd_timeout_str db 'K : FS - HD timeout',13,10,0 |
||
2608 | hd_read_str db 'K : FS - HD read error',13,10,0 |
||
2609 | hd_write_str db 'K : FS - HD write error',13,10,0 |
||
2610 | hd_lba_str db 'K : FS - HD LBA error',13,10,0 |
||
2611 | endg |
||
2612 | |||
2613 | hd_timeout_error: |
||
2614 | |||
2615 | call clear_hd_cache |
||
2616 | call clear_application_table_status |
||
2617 | mov esi,hd_timeout_str |
||
2618 | call sys_msg_board_str |
||
2619 | ; jmp $ |
||
2620 | mov [hd_error],1 |
||
2621 | pop eax |
||
2622 | ret |
||
2623 | |||
2624 | hd_read_error: |
||
2625 | |||
2626 | call clear_hd_cache |
||
2627 | call clear_application_table_status |
||
2628 | mov esi,hd_read_str |
||
2629 | call sys_msg_board_str |
||
2630 | pop edx eax |
||
2631 | jmp return_01 |
||
2632 | ; jmp $ |
||
2633 | |||
2634 | hd_write_error: |
||
2635 | |||
2636 | call clear_hd_cache |
||
2637 | call clear_application_table_status |
||
2638 | mov esi,hd_write_str |
||
2639 | call sys_msg_board_str |
||
2640 | jmp return_02 |
||
2641 | ; jmp $ |
||
2642 | |||
2643 | hd_lba_error: |
||
2644 | call clear_hd_cache |
||
2645 | call clear_application_table_status |
||
2646 | mov esi,hd_lba_str |
||
2647 | call sys_msg_board_str |
||
2648 | jmp LBA_read_ret |
||
2649 | |||
2650 | |||
2651 | wait_for_hd_idle: |
||
2652 | |||
2653 | push eax edx |
||
2654 | |||
2655 | call save_hd_wait_timeout |
||
2656 | |||
2657 | mov edx,[hdbase] |
||
2658 | add edx,0x7 |
||
2659 | |||
2660 | wfhil1: |
||
2661 | |||
2662 | call check_hd_wait_timeout |
||
2663 | cmp [hd_error],0 |
||
2664 | jne @f |
||
2665 | |||
2666 | in al,dx |
||
2667 | test al,128 |
||
2668 | jnz wfhil1 |
||
2669 | |||
2670 | @@: |
||
2671 | |||
2672 | pop edx eax |
||
2673 | ret |
||
2674 | |||
2675 | |||
2676 | |||
2677 | wait_for_sector_buffer: |
||
2678 | |||
2679 | push eax edx |
||
2680 | |||
2681 | mov edx,[hdbase] |
||
2682 | add edx,0x7 |
||
2683 | |||
2684 | call save_hd_wait_timeout |
||
2685 | |||
2686 | hdwait_sbuf: ; wait for sector buffer to be ready |
||
2687 | |||
2688 | call check_hd_wait_timeout |
||
2689 | cmp [hd_error],0 |
||
2690 | jne @f |
||
2691 | |||
2692 | in al,dx |
||
2693 | test al,8 |
||
2694 | jz hdwait_sbuf |
||
2695 | |||
2696 | mov [hd_error],0 |
||
2697 | |||
2698 | cmp [hd_setup],1 ; do not mark error for setup request |
||
2699 | je buf_wait_ok |
||
2700 | |||
2701 | test al,1 ; previous command ended up with an error |
||
2702 | jz buf_wait_ok |
||
2703 | @@: |
||
2704 | mov [hd_error],1 |
||
2705 | |||
2706 | buf_wait_ok: |
||
2707 | |||
2708 | pop edx eax |
||
2709 | ret |
||
2710 | |||
2711 | |||
2712 | |||
2713 | read_hd_file: |
||
2714 | ;----------------------------------------------------------------- |
||
2715 | ; |
||
2716 | ; Converting old reading function for hd-application start. |
||
2717 | ; |
||
2718 | ; IN: |
||
2719 | ; |
||
2720 | ; eax - pointer to file (0 = read only first sector of drive: eg 'label') |
||
2721 | ; ebx - file lenght |
||
2722 | ; ecx - start 512 byte block number |
||
2723 | ; edx - number of blocks to read |
||
2724 | ; esi - pointer to return/work area (atleast 20 000 bytes) |
||
2725 | ; |
||
2726 | ; For new read function |
||
2727 | ; |
||
2728 | ; EAX (PAR0) pointer to file-name |
||
2729 | ; ECX (PAR1) pointer to buffer |
||
2730 | ; EBX (PAR2) vt file blocks to read |
||
2731 | ; EDX (PAR3) pointer to path |
||
2732 | ; ESI vt first 512 block to read |
||
2733 | ; EDI if 0 - return root |
||
2734 | ;-------------------------------------------------------------------------- |
||
2735 | |||
2736 | push ecx esi edi |
||
2737 | mov esi,eax |
||
2738 | mov edi,startpath |
||
2739 | mov ecx,250 |
||
2740 | cld |
||
2741 | rep movsb |
||
2742 | pop edi esi ecx |
||
2743 | |||
2744 | mov eax,startpath |
||
2745 | mov [eax+ebx-12],byte 0 |
||
2746 | |||
2747 | push eax ebx ecx edx esi |
||
2748 | |||
2749 | pop ecx ; pointer to buffer |
||
2750 | add ecx,1024 |
||
2751 | pop ebx ; number of blocks to read |
||
2752 | pop esi ; first block to read |
||
2753 | dec esi |
||
2754 | pop eax ; file length |
||
2755 | pop edx ; pointer to path |
||
2756 | |||
2757 | mov edi,12 |
||
2758 | lea eax,[eax+edx-12+1] |
||
2759 | call file_read |
||
2760 | |||
2761 | ret |
||
2762 | |||
2763 | ; \begin{diamond} |
||
2764 | hd_find_lfn: |
||
2765 | ; in: esi->name |
||
2766 | ; out: CF=1 - file not found |
||
2767 | ; else CF=0 and edi->direntry, eax=sector |
||
2768 | ; destroys eax |
||
2769 | push esi edi |
||
2770 | push 0 |
||
2771 | push 0 |
||
2772 | push fat16_root_first |
||
2773 | push fat16_root_next |
||
2774 | mov eax, [ROOT_CLUSTER] |
||
2775 | cmp [fat_type], 32 |
||
2776 | jz .fat32 |
||
2777 | .loop: |
||
2778 | call fat_find_lfn |
||
2779 | jc .notfound |
||
2780 | cmp byte [esi], 0 |
||
2781 | jz .found |
||
2782 | test byte [edi+11], 10h |
||
2783 | jz .notfound |
||
2784 | and dword [esp+12], 0 |
||
2785 | mov eax, [edi+20-2] |
||
2786 | mov ax, [edi+26] ; cluster |
||
2787 | .fat32: |
||
2788 | mov [esp+8], eax |
||
2789 | mov dword [esp+4], fat_notroot_first |
||
2790 | mov dword [esp], fat_notroot_next |
||
2791 | jmp .loop |
||
2792 | .notfound: |
||
2793 | add esp, 16 |
||
2794 | pop edi esi |
||
2795 | stc |
||
2796 | ret |
||
2797 | .found: |
||
2798 | lea eax, [esp+8] |
||
2799 | cmp dword [eax], 0 |
||
2800 | jz .root |
||
2801 | call fat_get_sector |
||
2802 | jmp .cmn |
||
2803 | .root: |
||
2804 | mov eax, [eax+4] |
||
2805 | add eax, [ROOT_START] |
||
2806 | .cmn: |
||
2807 | add esp, 20 ; CF=0 |
||
2808 | pop esi |
||
2809 | ret |
||
2810 | |||
2811 | ;---------------------------------------------------------------- |
||
2812 | ; |
||
2813 | ; fs_HdRead - LFN variant for reading hard disk |
||
2814 | ; |
||
2815 | ; esi points to filename |
||
2816 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
2817 | ; may be ebx=0 - start from first byte |
||
2818 | ; ecx number of bytes to read, 0+ |
||
2819 | ; edx mem location to return data |
||
2820 | ; |
||
2821 | ; ret ebx = bytes read or 0xffffffff file not found |
||
2822 | ; eax = 0 ok read or other = errormsg |
||
2823 | ; |
||
2824 | ;-------------------------------------------------------------- |
||
2825 | fs_HdRead: |
||
2826 | cmp [fat_type], 0 |
||
2827 | jnz @f |
||
2828 | or ebx, -1 |
||
2829 | mov eax, ERROR_UNKNOWN_FS |
||
2830 | ret |
||
2831 | @@: |
||
2832 | push edi |
||
2833 | cmp byte [esi], 0 |
||
2834 | jnz @f |
||
2835 | .noaccess: |
||
2836 | pop edi |
||
2837 | .noaccess_2: |
||
2838 | or ebx, -1 |
||
2839 | mov eax, ERROR_ACCESS_DENIED |
||
2840 | ret |
||
2841 | |||
2842 | .noaccess_3: |
||
2843 | add esp,4 |
||
2844 | .noaccess_1: |
||
2845 | add esp,4 |
||
2846 | .noaccess_4: |
||
2847 | add esp,4*5 |
||
2848 | jmp .noaccess_2 |
||
2849 | |||
2850 | @@: |
||
2851 | call hd_find_lfn |
||
2852 | jnc .found |
||
2853 | pop edi |
||
2854 | cmp [hd_error],0 |
||
2855 | jne .noaccess_2 |
||
2856 | or ebx, -1 |
||
2857 | mov eax, ERROR_FILE_NOT_FOUND |
||
2858 | ret |
||
2859 | |||
2860 | .found: |
||
2861 | test byte [edi+11], 0x10 ; do not allow read directories |
||
2862 | jnz .noaccess |
||
2863 | test ebx, ebx |
||
2864 | jz .l1 |
||
2865 | cmp dword [ebx+4], 0 |
||
2866 | jz @f |
||
2867 | xor ebx, ebx |
||
2868 | .reteof: |
||
2869 | mov eax, 6 |
||
2870 | pop edi |
||
2871 | ret |
||
2872 | @@: |
||
2873 | mov ebx, [ebx] |
||
2874 | .l1: |
||
2875 | push ecx edx |
||
2876 | push 0 |
||
2877 | mov eax, [edi+28] |
||
2878 | sub eax, ebx |
||
2879 | jb .eof |
||
2880 | cmp eax, ecx |
||
2881 | jae @f |
||
2882 | mov ecx, eax |
||
2883 | mov byte [esp], 6 |
||
2884 | @@: |
||
2885 | mov eax, [edi+20-2] |
||
2886 | mov ax, [edi+26] |
||
2887 | ; now eax=cluster, ebx=position, ecx=count, edx=buffer for data |
||
2888 | .new_cluster: |
||
2889 | jecxz .new_sector |
||
2890 | test eax, eax |
||
2891 | jz .eof |
||
2892 | cmp eax, [fatRESERVED] |
||
2893 | jae .eof |
||
2894 | mov [cluster_tmp], eax |
||
2895 | dec eax |
||
2896 | dec eax |
||
2897 | mov edi, [SECTORS_PER_CLUSTER] |
||
2898 | imul eax, edi |
||
2899 | add eax, [DATA_START] |
||
2900 | .new_sector: |
||
2901 | test ecx, ecx |
||
2902 | jz .done |
||
2903 | sub ebx, 512 |
||
2904 | jae .skip |
||
2905 | add ebx, 512 |
||
2906 | jnz .force_buf |
||
2907 | cmp ecx, 512 |
||
2908 | jb .force_buf |
||
2909 | ; we may read directly to given buffer |
||
2910 | push ebx |
||
2911 | mov ebx, edx |
||
2912 | call hd_read |
||
2913 | cmp [hd_error],0 |
||
2914 | jne .noaccess_1 |
||
2915 | pop ebx |
||
2916 | add edx, 512 |
||
2917 | sub ecx, 512 |
||
2918 | jmp .skip |
||
2919 | .force_buf: |
||
2920 | ; we must read sector to temporary buffer and then copy it to destination |
||
2921 | push eax ebx |
||
2922 | mov ebx, buffer |
||
2923 | call hd_read |
||
2924 | cmp [hd_error],0 |
||
2925 | jne .noaccess_3 |
||
2926 | |||
2927 | mov eax, ebx |
||
2928 | pop ebx |
||
2929 | add eax, ebx |
||
2930 | push ecx |
||
2931 | add ecx, ebx |
||
2932 | cmp ecx, 512 |
||
2933 | jbe @f |
||
2934 | mov ecx, 512 |
||
2935 | @@: |
||
2936 | sub ecx, ebx |
||
2937 | mov ebx, edx |
||
2938 | call memmove |
||
2939 | add edx, ecx |
||
2940 | sub [esp], ecx |
||
2941 | pop ecx |
||
2942 | pop eax |
||
2943 | xor ebx, ebx |
||
2944 | .skip: |
||
2945 | inc eax |
||
2946 | dec edi |
||
2947 | jnz .new_sector |
||
2948 | mov eax, [cluster_tmp] |
||
2949 | call get_FAT |
||
2950 | cmp [hd_error],0 |
||
2951 | jne .noaccess_4 |
||
2952 | |||
2953 | jmp .new_cluster |
||
2954 | .done: |
||
2955 | mov ebx, edx |
||
2956 | pop eax edx ecx edi |
||
2957 | sub ebx, edx |
||
2958 | ret |
||
2959 | .eof: |
||
2960 | mov ebx, edx |
||
2961 | pop eax edx ecx |
||
2962 | sub ebx, edx |
||
2963 | jmp .reteof |
||
2964 | |||
2965 | ;---------------------------------------------------------------- |
||
2966 | ; |
||
2967 | ; fs_HdReadFolder - LFN variant for reading hard disk folder |
||
2968 | ; |
||
2969 | ; esi points to filename |
||
2970 | ; ebx pointer to structure 32-bit number = first wanted block, 0+ |
||
2971 | ; & flags (bitfields) |
||
2972 | ; flags: bit 0: 0=ANSI names, 1=UNICODE names |
||
2973 | ; ecx number of blocks to read, 0+ |
||
2974 | ; edx mem location to return data |
||
2975 | ; |
||
2976 | ; ret ebx = blocks read or 0xffffffff folder not found |
||
2977 | ; eax = 0 ok read or other = errormsg |
||
2978 | ; |
||
2979 | ;-------------------------------------------------------------- |
||
2980 | fs_HdReadFolder: |
||
2981 | mov eax, [ROOT_CLUSTER] |
||
2982 | push edi |
||
2983 | cmp byte [esi], 0 |
||
2984 | jz .doit |
||
2985 | call hd_find_lfn |
||
2986 | jnc .found |
||
2987 | pop edi |
||
2988 | or ebx, -1 |
||
2989 | mov eax, ERROR_FILE_NOT_FOUND |
||
2990 | ret |
||
2991 | .found: |
||
2992 | test byte [edi+11], 0x10 ; do not allow read files |
||
2993 | jnz .found_dir |
||
2994 | pop edi |
||
2995 | or ebx, -1 |
||
2996 | mov eax, ERROR_ACCESS_DENIED |
||
2997 | ret |
||
2998 | .found_dir: |
||
2999 | mov eax, [edi+20-2] |
||
3000 | mov ax, [edi+26] ; eax=cluster |
||
3001 | .doit: |
||
3002 | push esi ecx |
||
3003 | push ebp |
||
3004 | sub esp, 262*2 ; reserve space for LFN |
||
3005 | mov ebp, esp |
||
3006 | push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE name |
||
3007 | mov ebx, [ebx] |
||
3008 | ; init header |
||
3009 | push eax ecx |
||
3010 | mov edi, edx |
||
3011 | mov ecx, 32/4 |
||
3012 | xor eax, eax |
||
3013 | rep stosd |
||
3014 | pop ecx eax |
||
3015 | mov byte [edx], 1 ; version |
||
3016 | mov esi, edi ; esi points to BDFE |
||
3017 | .new_cluster: |
||
3018 | mov [cluster_tmp], eax |
||
3019 | test eax, eax |
||
3020 | jnz @f |
||
3021 | cmp [fat_type], 32 |
||
3022 | jz .notfound |
||
3023 | mov eax, [ROOT_START] |
||
3024 | push [ROOT_SECTORS] |
||
3025 | push ebx |
||
3026 | jmp .new_sector |
||
3027 | @@: |
||
3028 | dec eax |
||
3029 | dec eax |
||
3030 | imul eax, [SECTORS_PER_CLUSTER] |
||
3031 | push [SECTORS_PER_CLUSTER] |
||
3032 | add eax, [DATA_START] |
||
3033 | push ebx |
||
3034 | .new_sector: |
||
3035 | mov ebx, buffer |
||
3036 | mov edi, ebx |
||
3037 | call hd_read |
||
3038 | cmp [hd_error], 0 |
||
3039 | jnz .notfound2 |
||
3040 | add ebx, 512 |
||
3041 | push eax |
||
3042 | .l1: |
||
3043 | call fat_get_name |
||
3044 | jc .l2 |
||
3045 | cmp byte [edi+11], 0xF |
||
3046 | jnz .do_bdfe |
||
3047 | add edi, 0x20 |
||
3048 | cmp edi, ebx |
||
3049 | jb .do_bdfe |
||
3050 | pop eax |
||
3051 | inc eax |
||
3052 | dec dword [esp+4] |
||
3053 | jnz @f |
||
3054 | mov eax, [cluster_tmp] |
||
3055 | test eax, eax |
||
3056 | jz .done |
||
3057 | call get_FAT |
||
3058 | cmp [hd_error], 0 |
||
3059 | jnz .notfound2 |
||
3060 | cmp eax, 2 |
||
3061 | jb .done |
||
3062 | cmp eax, [fatRESERVED] |
||
3063 | jae .done |
||
3064 | push eax |
||
3065 | mov eax, [SECTORS_PER_CLUSTER] |
||
3066 | mov [esp+8], eax |
||
3067 | pop eax |
||
3068 | mov [cluster_tmp], eax |
||
3069 | dec eax |
||
3070 | dec eax |
||
3071 | imul eax, [SECTORS_PER_CLUSTER] |
||
3072 | add eax, [DATA_START] |
||
3073 | @@: |
||
3074 | mov ebx, buffer |
||
3075 | mov edi, ebx |
||
3076 | call hd_read |
||
3077 | cmp [hd_error], 0 |
||
3078 | jnz .notfound2 |
||
3079 | add ebx, 512 |
||
3080 | push eax |
||
3081 | .do_bdfe: |
||
3082 | inc dword [edx+8] ; new file found |
||
3083 | dec dword [esp+4] |
||
3084 | jns .l2 |
||
3085 | dec ecx |
||
3086 | js .l2 |
||
3087 | inc dword [edx+4] ; new file block copied |
||
3088 | call fat_entry_to_bdfe |
||
3089 | .l2: |
||
3090 | add edi, 0x20 |
||
3091 | cmp edi, ebx |
||
3092 | jb .l1 |
||
3093 | pop eax |
||
3094 | inc eax |
||
3095 | dec dword [esp+4] |
||
3096 | jnz .new_sector |
||
3097 | mov eax, [cluster_tmp] |
||
3098 | test eax, eax |
||
3099 | jz .done |
||
3100 | call get_FAT |
||
3101 | cmp [hd_error], 0 |
||
3102 | jnz .notfound2 |
||
3103 | cmp eax, 2 |
||
3104 | jb .done |
||
3105 | cmp eax, [fatRESERVED] |
||
3106 | jae .done |
||
3107 | push eax |
||
3108 | mov eax, [SECTORS_PER_CLUSTER] |
||
3109 | mov [esp+8], eax |
||
3110 | pop eax |
||
3111 | pop ebx |
||
3112 | add esp, 4 |
||
3113 | jmp .new_cluster |
||
3114 | .notfound2: |
||
3115 | add esp, 8 |
||
3116 | .notfound: |
||
3117 | add esp, 262*2+4 |
||
3118 | pop ebp ecx esi edi |
||
3119 | mov eax, ERROR_FILE_NOT_FOUND |
||
3120 | or ebx, -1 |
||
3121 | ret |
||
3122 | .done: |
||
3123 | add esp, 262*2+4+8 |
||
3124 | pop ebp |
||
3125 | mov ebx, [edx+4] |
||
3126 | xor eax, eax |
||
3127 | dec ecx |
||
3128 | js @f |
||
3129 | mov al, ERROR_END_OF_FILE |
||
3130 | @@: |
||
3131 | pop ecx esi edi |
||
3132 | ret |
||
3133 | |||
3134 | fat16_root_next: |
||
3135 | cmp edi, buffer+0x200-0x20 |
||
3136 | jae fat16_root_next_sector |
||
3137 | add edi, 0x20 |
||
3138 | ret ; CF=0 |
||
3139 | fat16_root_next_sector: |
||
3140 | ; read next sector |
||
3141 | push ecx |
||
3142 | mov ecx, [eax+4] |
||
3143 | inc ecx |
||
3144 | mov [eax+4], ecx |
||
3145 | cmp ecx, [ROOT_SECTORS] |
||
3146 | pop ecx |
||
3147 | jae fat16_root_first.readerr |
||
3148 | fat16_root_first: |
||
3149 | mov eax, [eax+4] |
||
3150 | add eax, [ROOT_START] |
||
3151 | push ebx |
||
3152 | mov edi, buffer |
||
3153 | mov ebx, edi |
||
3154 | call hd_read |
||
3155 | pop ebx |
||
3156 | cmp [hd_error], 0 |
||
3157 | jnz .readerr |
||
3158 | ret ; CF=0 |
||
3159 | .readerr: |
||
3160 | stc |
||
3161 | ret |
||
3162 | fat16_root_begin_write: |
||
3163 | push edi eax |
||
3164 | call fat16_root_first |
||
3165 | pop eax edi |
||
3166 | ret |
||
3167 | fat16_root_end_write: |
||
3168 | pusha |
||
3169 | mov eax, [eax+4] |
||
3170 | add eax, [ROOT_START] |
||
3171 | mov ebx, buffer |
||
3172 | call hd_write |
||
3173 | popa |
||
3174 | ret |
||
3175 | fat16_root_next_write: |
||
3176 | cmp edi, buffer+0x200 |
||
3177 | jae @f |
||
3178 | ret |
||
3179 | @@: |
||
3180 | call fat16_root_end_write |
||
3181 | jmp fat16_root_next_sector |
||
3182 | fat16_root_extend_dir: |
||
3183 | stc |
||
3184 | ret |
||
3185 | |||
3186 | fat_notroot_next: |
||
3187 | cmp edi, buffer+0x200-0x20 |
||
3188 | jae fat_notroot_next_sector |
||
3189 | add edi, 0x20 |
||
3190 | ret ; CF=0 |
||
3191 | fat_notroot_next_sector: |
||
3192 | push ecx |
||
3193 | mov ecx, [eax+4] |
||
3194 | inc ecx |
||
3195 | cmp ecx, [SECTORS_PER_CLUSTER] |
||
3196 | jae fat_notroot_next_cluster |
||
3197 | mov [eax+4], ecx |
||
3198 | jmp @f |
||
3199 | fat_notroot_next_cluster: |
||
3200 | push eax |
||
3201 | mov eax, [eax] |
||
3202 | call get_FAT |
||
3203 | mov ecx, eax |
||
3204 | pop eax |
||
3205 | cmp [hd_error], 0 |
||
3206 | jnz fat_notroot_next_err |
||
3207 | cmp ecx, [fatRESERVED] |
||
3208 | jae fat_notroot_next_err |
||
3209 | mov [eax], ecx |
||
3210 | and dword [eax+4], 0 |
||
3211 | @@: |
||
3212 | pop ecx |
||
3213 | fat_notroot_first: |
||
3214 | call fat_get_sector |
||
3215 | push ebx |
||
3216 | mov edi, buffer |
||
3217 | mov ebx, edi |
||
3218 | call hd_read |
||
3219 | pop ebx |
||
3220 | cmp [hd_error], 0 |
||
3221 | jnz @f |
||
3222 | ret ; CF=0 |
||
3223 | fat_notroot_next_err: |
||
3224 | pop ecx |
||
3225 | @@: |
||
3226 | stc |
||
3227 | ret |
||
3228 | fat_notroot_begin_write: |
||
3229 | push eax edi |
||
3230 | call fat_notroot_first |
||
3231 | pop edi eax |
||
3232 | ret |
||
3233 | fat_notroot_end_write: |
||
3234 | call fat_get_sector |
||
3235 | push ebx |
||
3236 | mov ebx, buffer |
||
3237 | call hd_write |
||
3238 | pop ebx |
||
3239 | ret |
||
3240 | fat_notroot_next_write: |
||
3241 | cmp edi, buffer+0x200 |
||
3242 | jae @f |
||
3243 | ret |
||
3244 | @@: |
||
3245 | push eax |
||
3246 | call fat_notroot_end_write |
||
3247 | pop eax |
||
3248 | jmp fat_notroot_next_sector |
||
3249 | fat_notroot_extend_dir: |
||
3250 | push eax |
||
3251 | mov eax, [eax] |
||
3252 | call get_free_FAT |
||
3253 | jnc .found |
||
3254 | pop eax |
||
3255 | ret ; CF=1 |
||
3256 | .found: |
||
3257 | push edx |
||
3258 | mov edx, [fatEND] |
||
3259 | call set_FAT |
||
3260 | mov edx, eax |
||
3261 | mov eax, [esp+4] |
||
3262 | mov eax, [eax] |
||
3263 | push edx |
||
3264 | call set_FAT |
||
3265 | pop edx |
||
3266 | cmp [hd_error], 0 |
||
3267 | jz @f |
||
3268 | pop edx |
||
3269 | pop eax |
||
3270 | stc |
||
3271 | ret |
||
3272 | @@: |
||
3273 | push ecx |
||
3274 | or ecx, -1 |
||
3275 | call add_disk_free_space |
||
3276 | ; zero new cluster |
||
3277 | mov ecx, 512/4 |
||
3278 | mov edi, buffer |
||
3279 | push edi |
||
3280 | xor eax, eax |
||
3281 | rep stosd |
||
3282 | pop edi |
||
3283 | pop ecx |
||
3284 | mov eax, [esp+4] |
||
3285 | mov [eax], edx |
||
3286 | and dword [eax+4], 0 |
||
3287 | pop edx |
||
3288 | mov eax, [eax] |
||
3289 | dec eax |
||
3290 | dec eax |
||
3291 | push ebx ecx |
||
3292 | mov ecx, [SECTORS_PER_CLUSTER] |
||
3293 | imul eax, ecx |
||
3294 | add eax, [DATA_START] |
||
3295 | mov ebx, edi |
||
3296 | @@: |
||
3297 | call hd_write |
||
3298 | inc eax |
||
3299 | loop @b |
||
3300 | pop ecx ebx eax |
||
3301 | clc |
||
3302 | ret |
||
3303 | |||
3304 | fat_get_sector: |
||
3305 | push ecx |
||
3306 | mov ecx, [eax] |
||
3307 | dec ecx |
||
3308 | dec ecx |
||
3309 | imul ecx, [SECTORS_PER_CLUSTER] |
||
3310 | add ecx, [DATA_START] |
||
3311 | add ecx, [eax+4] |
||
3312 | mov eax, ecx |
||
3313 | pop ecx |
||
3314 | ret |
||
3315 | |||
3316 | ;---------------------------------------------------------------- |
||
3317 | ; |
||
3318 | ; fs_HdRewrite - LFN variant for writing hard disk |
||
3319 | ; |
||
3320 | ; esi points to filename |
||
3321 | ; ebx ignored (reserved) |
||
3322 | ; ecx number of bytes to write, 0+ |
||
3323 | ; edx mem location to data |
||
3324 | ; |
||
3325 | ; ret ebx = number of written bytes |
||
3326 | ; eax = 0 ok read or other = errormsg |
||
3327 | ; |
||
3328 | ;-------------------------------------------------------------- |
||
3329 | fshrad: |
||
3330 | mov eax, ERROR_ACCESS_DENIED |
||
3331 | xor ebx, ebx |
||
3332 | ret |
||
3333 | fshrfs: |
||
3334 | mov eax, ERROR_UNKNOWN_FS |
||
3335 | xor ebx, ebx |
||
3336 | ret |
||
3337 | |||
3338 | fs_HdRewrite: |
||
3339 | cmp [fat_type], 0 |
||
3340 | jz fshrfs |
||
3341 | cmp byte [esi], 0 |
||
3342 | jz fshrad |
||
3343 | pushad |
||
3344 | xor ebp, ebp |
||
3345 | push esi |
||
3346 | @@: |
||
3347 | lodsb |
||
3348 | test al, al |
||
3349 | jz @f |
||
3350 | cmp al, '/' |
||
3351 | jnz @b |
||
3352 | lea ebp, [esi-1] |
||
3353 | jmp @b |
||
3354 | @@: |
||
3355 | pop esi |
||
3356 | test ebp, ebp |
||
3357 | jnz .noroot |
||
3358 | mov ebp, [ROOT_CLUSTER] |
||
3359 | cmp [fat_type], 32 |
||
3360 | jz .pushnotroot |
||
3361 | push fat16_root_extend_dir |
||
3362 | push fat16_root_end_write |
||
3363 | push fat16_root_next_write |
||
3364 | push fat16_root_begin_write |
||
3365 | xor ebp, ebp |
||
3366 | push ebp |
||
3367 | push ebp |
||
3368 | push fat16_root_first |
||
3369 | push fat16_root_next |
||
3370 | jmp .common1 |
||
3371 | .noroot: |
||
3372 | ; check existence |
||
3373 | mov byte [ebp], 0 |
||
3374 | call hd_find_lfn |
||
3375 | mov byte [ebp], '/' |
||
3376 | lea esi, [ebp+1] |
||
3377 | jnc @f |
||
3378 | mov eax, ERROR_FILE_NOT_FOUND |
||
3379 | .ret1: |
||
3380 | mov [esp+28], eax |
||
3381 | popad |
||
3382 | xor ebx, ebx |
||
3383 | ret |
||
3384 | @@: |
||
3385 | test byte [edi+11], 0x10 ; must be directory |
||
3386 | mov eax, ERROR_ACCESS_DENIED |
||
3387 | jz .ret1 |
||
3388 | mov ebp, [edi+20-2] |
||
3389 | mov bp, [edi+26] ; ebp=cluster |
||
3390 | mov eax, ERROR_FAT_TABLE |
||
3391 | cmp ebp, 2 |
||
3392 | jb .ret1 |
||
3393 | .pushnotroot: |
||
3394 | push fat_notroot_extend_dir |
||
3395 | push fat_notroot_end_write |
||
3396 | push fat_notroot_next_write |
||
3397 | push fat_notroot_begin_write |
||
3398 | push 0 |
||
3399 | push ebp |
||
3400 | push fat_notroot_first |
||
3401 | push fat_notroot_next |
||
3402 | .common1: |
||
3403 | call fat_find_lfn |
||
3404 | jc .notfound |
||
3405 | ; found; must not be directory |
||
3406 | test byte [edi+11], 10h |
||
3407 | jz @f |
||
3408 | add esp, 32 |
||
3409 | popad |
||
3410 | mov eax, ERROR_ACCESS_DENIED |
||
3411 | xor ebx, ebx |
||
3412 | ret |
||
3413 | @@: |
||
3414 | ; delete FAT chain |
||
3415 | push edi |
||
3416 | xor eax, eax |
||
3417 | mov dword [edi+28], eax ; zero size |
||
3418 | xor ecx, ecx |
||
3419 | mov eax, [edi+20-2] |
||
3420 | mov ax, [edi+26] |
||
3421 | mov word [edi+20], cx |
||
3422 | mov word [edi+26], cx |
||
3423 | test eax, eax |
||
3424 | jz .done1 |
||
3425 | @@: |
||
3426 | cmp eax, [fatRESERVED] |
||
3427 | jae .done1 |
||
3428 | push edx |
||
3429 | xor edx, edx |
||
3430 | call set_FAT |
||
3431 | mov eax, edx |
||
3432 | pop edx |
||
3433 | inc ecx |
||
3434 | jmp @b |
||
3435 | .done1: |
||
3436 | pop edi |
||
3437 | call get_time_for_file |
||
3438 | mov [edi+22], ax |
||
3439 | call get_date_for_file |
||
3440 | mov [edi+24], ax |
||
3441 | mov [edi+18], ax |
||
3442 | or byte [edi+11], 20h ; set 'archive' attribute |
||
3443 | jmp .doit |
||
3444 | .notfound: |
||
3445 | ; file is not found; generate short name |
||
3446 | call fat_name_is_legal |
||
3447 | jc @f |
||
3448 | add esp, 32 |
||
3449 | popad |
||
3450 | mov eax, ERROR_FILE_NOT_FOUND |
||
3451 | xor ebx, ebx |
||
3452 | ret |
||
3453 | @@: |
||
3454 | sub esp, 12 |
||
3455 | mov edi, esp |
||
3456 | call fat_gen_short_name |
||
3457 | .test_short_name_loop: |
||
3458 | push esi edi ecx |
||
3459 | mov esi, edi |
||
3460 | lea eax, [esp+12+12+8] |
||
3461 | mov [eax], ebp |
||
3462 | and dword [eax+4], 0 |
||
3463 | call dword [eax-4] |
||
3464 | jc .found |
||
3465 | .test_short_name_entry: |
||
3466 | cmp byte [edi+11], 0xF |
||
3467 | jz .test_short_name_cont |
||
3468 | mov ecx, 11 |
||
3469 | push esi edi |
||
3470 | repz cmpsb |
||
3471 | pop edi esi |
||
3472 | jz .short_name_found |
||
3473 | .test_short_name_cont: |
||
3474 | lea eax, [esp+12+12+8] |
||
3475 | call dword [eax-8] |
||
3476 | jnc .test_short_name_entry |
||
3477 | jmp .found |
||
3478 | .short_name_found: |
||
3479 | pop ecx edi esi |
||
3480 | call fat_next_short_name |
||
3481 | jnc .test_short_name_loop |
||
3482 | .disk_full: |
||
3483 | add esp, 12+32 |
||
3484 | popa |
||
3485 | mov eax, ERROR_DISK_FULL |
||
3486 | xor ebx, ebx |
||
3487 | ret |
||
3488 | .found: |
||
3489 | pop ecx edi esi |
||
3490 | ; now find space in directory |
||
3491 | ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' |
||
3492 | mov al, '~' |
||
3493 | push ecx edi |
||
3494 | mov ecx, 8 |
||
3495 | repnz scasb |
||
3496 | push 1 |
||
3497 | pop eax ; 1 entry |
||
3498 | jnz .notilde |
||
3499 | ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total |
||
3500 | xor eax, eax |
||
3501 | @@: |
||
3502 | cmp byte [esi], 0 |
||
3503 | jz @f |
||
3504 | inc esi |
||
3505 | inc eax |
||
3506 | jmp @b |
||
3507 | @@: |
||
3508 | sub esi, eax |
||
3509 | add eax, 12+13 |
||
3510 | mov ecx, 13 |
||
3511 | push edx |
||
3512 | cdq |
||
3513 | div ecx |
||
3514 | pop edx |
||
3515 | .notilde: |
||
3516 | push -1 |
||
3517 | push -1 |
||
3518 | push -1 |
||
3519 | ; find |
||
3520 | xor ecx, ecx |
||
3521 | push eax |
||
3522 | lea eax, [esp+16+8+12+8] |
||
3523 | mov [eax], ebp |
||
3524 | and dword [eax+4], 0 |
||
3525 | call dword [eax-4] |
||
3526 | pop eax |
||
3527 | jnc .scan_dir |
||
3528 | .fsfrfe3: |
||
3529 | add esp, 12+8+12+32 |
||
3530 | popad |
||
3531 | mov eax, 11 |
||
3532 | xor ebx, ebx |
||
3533 | ret |
||
3534 | .scan_dir: |
||
3535 | cmp byte [edi], 0 |
||
3536 | jz .free |
||
3537 | cmp byte [edi], 0xE5 |
||
3538 | jz .free |
||
3539 | xor ecx, ecx |
||
3540 | .scan_cont: |
||
3541 | push eax |
||
3542 | lea eax, [esp+16+8+12+8] |
||
3543 | call dword [eax-8] |
||
3544 | pop eax |
||
3545 | jnc .scan_dir |
||
3546 | cmp [hd_error], 0 |
||
3547 | jnz .fsfrfe3 |
||
3548 | push eax |
||
3549 | lea eax, [esp+16+8+12+8] |
||
3550 | call dword [eax+20] ; extend directory |
||
3551 | pop eax |
||
3552 | jnc .scan_dir |
||
3553 | add esp, 12+8+12+32 |
||
3554 | popad |
||
3555 | mov eax, ERROR_DISK_FULL |
||
3556 | xor ebx, ebx |
||
3557 | ret |
||
3558 | .free: |
||
3559 | test ecx, ecx |
||
3560 | jnz @f |
||
3561 | mov [esp], edi |
||
3562 | mov ecx, [esp+12+8+12+8] |
||
3563 | mov [esp+4], ecx |
||
3564 | mov ecx, [esp+12+8+12+12] |
||
3565 | mov [esp+8], ecx |
||
3566 | xor ecx, ecx |
||
3567 | @@: |
||
3568 | inc ecx |
||
3569 | cmp ecx, eax |
||
3570 | jb .scan_cont |
||
3571 | ; found! |
||
3572 | ; calculate name checksum |
||
3573 | push esi ecx |
||
3574 | mov esi, [esp+8+12] |
||
3575 | mov ecx, 11 |
||
3576 | xor eax, eax |
||
3577 | @@: |
||
3578 | ror al, 1 |
||
3579 | add al, [esi] |
||
3580 | inc esi |
||
3581 | loop @b |
||
3582 | pop ecx esi |
||
3583 | pop edi |
||
3584 | pop dword [esp+8+12+12] |
||
3585 | pop dword [esp+8+12+12] |
||
3586 | ; edi points to first entry in free chunk |
||
3587 | dec ecx |
||
3588 | jz .nolfn |
||
3589 | push esi |
||
3590 | push eax |
||
3591 | lea eax, [esp+8+8+12+8] |
||
3592 | call dword [eax+8] ; begin write |
||
3593 | mov al, 40h |
||
3594 | .writelfn: |
||
3595 | or al, cl |
||
3596 | mov esi, [esp+4] |
||
3597 | push ecx |
||
3598 | dec ecx |
||
3599 | imul ecx, 13 |
||
3600 | add esi, ecx |
||
3601 | stosb |
||
3602 | mov cl, 5 |
||
3603 | call fs_RamdiskRewrite.read_symbols |
||
3604 | mov ax, 0xF |
||
3605 | stosw |
||
3606 | mov al, [esp+4] |
||
3607 | stosb |
||
3608 | mov cl, 6 |
||
3609 | call fs_RamdiskRewrite.read_symbols |
||
3610 | xor eax, eax |
||
3611 | stosw |
||
3612 | mov cl, 2 |
||
3613 | call fs_RamdiskRewrite.read_symbols |
||
3614 | pop ecx |
||
3615 | lea eax, [esp+8+8+12+8] |
||
3616 | call dword [eax+12] ; next write |
||
3617 | xor eax, eax |
||
3618 | loop .writelfn |
||
3619 | pop eax |
||
3620 | pop esi |
||
3621 | ; lea eax, [esp+8+12+8] |
||
3622 | ; call dword [eax+16] ; end write |
||
3623 | .nolfn: |
||
3624 | xchg esi, [esp] |
||
3625 | mov ecx, 11 |
||
3626 | rep movsb |
||
3627 | mov word [edi], 20h ; attributes |
||
3628 | sub edi, 11 |
||
3629 | pop esi ecx |
||
3630 | add esp, 12 |
||
3631 | mov byte [edi+13], 0 ; tenths of a second at file creation time |
||
3632 | call get_time_for_file |
||
3633 | mov [edi+14], ax ; creation time |
||
3634 | mov [edi+22], ax ; last write time |
||
3635 | call get_date_for_file |
||
3636 | mov [edi+16], ax ; creation date |
||
3637 | mov [edi+24], ax ; last write date |
||
3638 | mov [edi+18], ax ; last access date |
||
3639 | xor ecx, ecx |
||
3640 | mov word [edi+20], cx ; high word of cluster |
||
3641 | mov word [edi+26], cx ; low word of cluster - to be filled |
||
3642 | mov dword [edi+28], ecx ; file size - to be filled |
||
3643 | .doit: |
||
3644 | lea eax, [esp+8] |
||
3645 | call dword [eax+16] ; flush directory |
||
3646 | push ecx |
||
3647 | mov ecx, [esp+4+32+24] |
||
3648 | push ecx |
||
3649 | push edi |
||
3650 | mov esi, edx |
||
3651 | test ecx, ecx |
||
3652 | jz .done |
||
3653 | mov eax, 2 |
||
3654 | call get_free_FAT |
||
3655 | jc .diskfull |
||
3656 | push eax |
||
3657 | mov [edi+26], ax |
||
3658 | shr eax, 16 |
||
3659 | mov [edi+20], ax |
||
3660 | lea eax, [esp+16+8] |
||
3661 | call dword [eax+16] ; flush directory |
||
3662 | pop eax |
||
3663 | push edx |
||
3664 | mov edx, [fatEND] |
||
3665 | call set_FAT |
||
3666 | pop edx |
||
3667 | .write_cluster: |
||
3668 | push eax |
||
3669 | dec eax |
||
3670 | dec eax |
||
3671 | mov ebp, [SECTORS_PER_CLUSTER] |
||
3672 | imul eax, ebp |
||
3673 | add eax, [DATA_START] |
||
3674 | ; write data |
||
3675 | .write_sector: |
||
3676 | mov ecx, 512 |
||
3677 | cmp dword [esp+8], ecx |
||
3678 | jb .writeshort |
||
3679 | ; we can write directly from given buffer |
||
3680 | mov ebx, esi |
||
3681 | add esi, ecx |
||
3682 | jmp .writecommon |
||
3683 | .writeshort: |
||
3684 | mov ecx, [esp+8] |
||
3685 | push ecx |
||
3686 | mov edi, buffer |
||
3687 | mov ebx, edi |
||
3688 | rep movsb |
||
3689 | mov ecx, buffer+0x200 |
||
3690 | sub ecx, edi |
||
3691 | push eax |
||
3692 | xor eax, eax |
||
3693 | rep stosb |
||
3694 | pop eax |
||
3695 | pop ecx |
||
3696 | .writecommon: |
||
3697 | call hd_write |
||
3698 | cmp [hd_error], 0 |
||
3699 | jnz .writeerr |
||
3700 | inc eax |
||
3701 | sub dword [esp+8], ecx |
||
3702 | jz .writedone |
||
3703 | dec ebp |
||
3704 | jnz .write_sector |
||
3705 | ; allocate new cluster |
||
3706 | pop eax |
||
3707 | mov ecx, eax |
||
3708 | call get_free_FAT |
||
3709 | jc .diskfull |
||
3710 | push edx |
||
3711 | mov edx, [fatEND] |
||
3712 | call set_FAT |
||
3713 | xchg eax, ecx |
||
3714 | mov edx, ecx |
||
3715 | call set_FAT |
||
3716 | pop edx |
||
3717 | xchg eax, ecx |
||
3718 | jmp .write_cluster |
||
3719 | .diskfull: |
||
3720 | mov eax, ERROR_DISK_FULL |
||
3721 | jmp .ret |
||
3722 | .writeerr: |
||
3723 | pop eax |
||
3724 | sub esi, ecx |
||
3725 | mov eax, 11 |
||
3726 | jmp .ret |
||
3727 | .writedone: |
||
3728 | pop eax |
||
3729 | .done: |
||
3730 | xor eax, eax |
||
3731 | .ret: |
||
3732 | pop edi ecx |
||
3733 | mov ebx, esi |
||
3734 | sub ebx, edx |
||
3735 | pop ebp |
||
3736 | mov [esp+32+28], eax |
||
3737 | lea eax, [esp+8] |
||
3738 | call dword [eax+8] |
||
3739 | mov [edi+28], ebx |
||
3740 | call dword [eax+16] |
||
3741 | mov [esp+32+16], ebx |
||
3742 | lea eax, [ebx+511] |
||
3743 | shr eax, 9 |
||
3744 | mov ecx, [SECTORS_PER_CLUSTER] |
||
3745 | lea eax, [eax+ecx-1] |
||
3746 | xor edx, edx |
||
3747 | div ecx |
||
3748 | mov ecx, ebp |
||
3749 | sub ecx, eax |
||
3750 | call add_disk_free_space |
||
3751 | add esp, 32 |
||
3752 | call update_disk |
||
3753 | popad |
||
3754 | ret |
||
3755 | |||
131 | diamond | 3756 | ;---------------------------------------------------------------- |
3757 | ; |
||
3758 | ; fs_HdWrite - LFN variant for writing to floppy |
||
3759 | ; |
||
3760 | ; esi points to filename |
||
3761 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
3762 | ; may be ebx=0 - start from first byte |
||
3763 | ; ecx number of bytes to write, 0+ |
||
3764 | ; edx mem location to data |
||
3765 | ; |
||
3766 | ; ret ebx = bytes written (maybe 0) |
||
3767 | ; eax = 0 ok write or other = errormsg |
||
3768 | ; |
||
3769 | ;-------------------------------------------------------------- |
||
3770 | fs_HdWrite.access_denied: |
||
3771 | push ERROR_ACCESS_DENIED |
||
3772 | fs_HdWrite.ret0: |
||
3773 | pop eax |
||
3774 | xor ebx, ebx |
||
3775 | ret |
||
3776 | |||
3777 | fs_HdWrite.ret11: |
||
3778 | push 11 |
||
3779 | jmp fs_HdWrite.ret0 |
||
3780 | |||
3781 | fs_HdWrite: |
||
3782 | cmp [fat_type], 0 |
||
3783 | jnz @f |
||
3784 | push ERROR_UNKNOWN_FS |
||
3785 | jmp .ret0 |
||
3786 | @@: |
||
3787 | cmp byte [esi], 0 |
||
3788 | jz .access_denied |
||
3789 | pushad |
||
3790 | call hd_find_lfn |
||
3791 | pushfd |
||
3792 | cmp [hd_error], 0 |
||
3793 | jz @f |
||
3794 | popfd |
||
3795 | popad |
||
3796 | push 11 |
||
3797 | jmp .ret0 |
||
3798 | @@: |
||
3799 | popfd |
||
3800 | jnc .found |
||
3801 | popad |
||
3802 | push ERROR_FILE_NOT_FOUND |
||
3803 | jmp .ret0 |
||
3804 | .found: |
||
3805 | ; FAT does not support files larger than 4GB |
||
3806 | test ebx, ebx |
||
3807 | jz .l1 |
||
3808 | cmp dword [ebx+4], 0 |
||
3809 | jz @f |
||
3810 | .eof: |
||
3811 | popad |
||
3812 | push ERROR_END_OF_FILE |
||
3813 | jmp .ret0 |
||
3814 | @@: |
||
3815 | mov ebx, [ebx] |
||
3816 | .l1: |
||
3817 | ; now edi points to direntry, ebx=start byte to write, |
||
3818 | ; ecx=number of bytes to write, edx=data pointer |
||
3819 | |||
3820 | ; extend file if needed |
||
3821 | add ecx, ebx |
||
3822 | jc .eof ; FAT does not support files larger than 4GB |
||
3823 | push eax ; save directory sector |
||
3824 | push 0 ; return value=0 |
||
3825 | |||
3826 | call get_time_for_file |
||
3827 | mov [edi+22], ax ; last write time |
||
3828 | call get_date_for_file |
||
3829 | mov [edi+24], ax ; last write date |
||
3830 | mov [edi+18], ax ; last access date |
||
3831 | |||
3832 | push dword [edi+28] ; save current file size |
||
3833 | cmp ecx, [edi+28] |
||
3834 | jbe .length_ok |
||
3835 | cmp ecx, ebx |
||
3836 | jz .length_ok |
||
3837 | call hd_extend_file |
||
3838 | jnc .length_ok |
||
3839 | mov [esp+4], eax |
||
3840 | ; hd_extend_file can return three error codes: FAT table error, device error or disk full. |
||
3841 | ; First two cases are fatal errors, in third case we may write some data |
||
3842 | cmp al, ERROR_DISK_FULL |
||
3843 | jz .disk_full |
||
3844 | pop eax |
||
3845 | pop eax |
||
3846 | mov [esp+4+28], eax |
||
3847 | pop eax |
||
3848 | popad |
||
3849 | xor ebx, ebx |
||
3850 | ret |
||
3851 | .disk_full: |
||
3852 | ; correct number of bytes to write |
||
3853 | mov ecx, [edi+28] |
||
3854 | cmp ecx, ebx |
||
3855 | ja .length_ok |
||
3856 | .ret: |
||
3857 | call update_disk |
||
3858 | cmp [hd_error], 0 |
||
3859 | jz @f |
||
3860 | mov byte [esp+4], 11 |
||
3861 | @@: |
||
3862 | pop eax |
||
3863 | pop eax |
||
3864 | mov [esp+4+28], eax ; eax=return value |
||
3865 | pop eax |
||
3866 | sub edx, [esp+20] |
||
3867 | mov [esp+16], edx ; ebx=number of written bytes |
||
3868 | popad |
||
3869 | ret |
||
3870 | .length_ok: |
||
3871 | mov esi, [edi+28] |
||
3872 | mov eax, [edi+20-2] |
||
3873 | mov ax, [edi+26] |
||
3874 | mov edi, eax ; edi=current cluster |
||
3875 | xor ebp, ebp ; ebp=current sector in cluster |
||
3876 | ; save directory |
||
3877 | mov eax, [esp+8] |
||
3878 | push ebx |
||
3879 | mov ebx, buffer |
||
3880 | call hd_write |
||
3881 | pop ebx |
||
3882 | cmp [hd_error], 0 |
||
3883 | jz @f |
||
3884 | .device_err: |
||
3885 | mov byte [esp+4], 11 |
||
3886 | jmp .ret |
||
3887 | @@: |
||
3888 | |||
3889 | ; now ebx=start pos, ecx=end pos, both lie inside file |
||
3890 | sub ecx, ebx |
||
3891 | jz .ret |
||
3892 | .write_loop: |
||
3893 | ; get length of data in current sector |
||
3894 | push ecx |
||
3895 | sub ebx, 0x200 |
||
3896 | jb .hasdata |
||
3897 | neg ebx |
||
3898 | xor ecx, ecx |
||
3899 | jmp @f |
||
3900 | .hasdata: |
||
3901 | neg ebx |
||
3902 | cmp ecx, ebx |
||
3903 | jbe @f |
||
3904 | mov ecx, ebx |
||
3905 | @@: |
||
3906 | ; get current sector number |
||
3907 | mov eax, edi |
||
3908 | dec eax |
||
3909 | dec eax |
||
3910 | imul eax, [SECTORS_PER_CLUSTER] |
||
3911 | add eax, [DATA_START] |
||
3912 | add eax, ebp |
||
3913 | ; load sector if needed |
||
3914 | cmp dword [esp+4], 0 ; we don't need to read uninitialized data |
||
3915 | jz .noread |
||
3916 | cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten |
||
3917 | jz .noread |
||
3918 | cmp ecx, esi ; (same for the last sector) |
||
3919 | jz .noread |
||
3920 | push ebx |
||
3921 | mov ebx, buffer |
||
3922 | call hd_read |
||
3923 | pop ebx |
||
3924 | cmp [hd_error], 0 |
||
3925 | jz @f |
||
3926 | .device_err2: |
||
3927 | pop ecx |
||
3928 | jmp .device_err |
||
3929 | @@: |
||
3930 | .noread: |
||
3931 | ; zero uninitialized data if file was extended (because hd_extend_file does not this) |
||
3932 | push eax ecx edi |
||
3933 | xor eax, eax |
||
3934 | mov ecx, 0x200 |
||
3935 | sub ecx, [esp+4+12] |
||
3936 | jbe @f |
||
3937 | mov edi, buffer |
||
3938 | add edi, [esp+4+12] |
||
3939 | rep stosb |
||
3940 | @@: |
||
3941 | ; zero uninitialized data in the last sector |
||
3942 | mov ecx, 0x200 |
||
3943 | sub ecx, esi |
||
3944 | jbe @f |
||
3945 | mov edi, buffer |
||
3946 | add edi, esi |
||
3947 | rep stosb |
||
3948 | @@: |
||
3949 | pop edi ecx eax |
||
3950 | ; copy new data |
||
3951 | push eax |
||
3952 | mov eax, edx |
||
3953 | neg ebx |
||
3954 | jecxz @f |
||
3955 | add ebx, buffer+0x200 |
||
3956 | call memmove |
||
3957 | xor ebx, ebx |
||
3958 | @@: |
||
3959 | pop eax |
||
3960 | ; save sector |
||
3961 | push ebx |
||
3962 | mov ebx, buffer |
||
3963 | call hd_write |
||
3964 | pop ebx |
||
3965 | cmp [hd_error], 0 |
||
3966 | jnz .device_err2 |
||
3967 | add edx, ecx |
||
3968 | sub [esp], ecx |
||
3969 | pop ecx |
||
3970 | jz .ret |
||
3971 | ; next sector |
||
3972 | inc ebp |
||
3973 | cmp ebp, [SECTORS_PER_CLUSTER] |
||
3974 | jb @f |
||
3975 | xor ebp, ebp |
||
3976 | mov eax, edi |
||
3977 | call get_FAT |
||
3978 | mov edi, eax |
||
3979 | cmp [hd_error], 0 |
||
3980 | jnz .device_err |
||
3981 | @@: |
||
3982 | sub esi, 0x200 |
||
3983 | jae @f |
||
3984 | xor esi, esi |
||
3985 | @@: |
||
3986 | sub dword [esp], 0x200 |
||
3987 | jae @f |
||
3988 | and dword [esp], 0 |
||
3989 | @@: jmp .write_loop |
||
3990 | |||
3991 | hd_extend_file.zero_size: |
||
3992 | xor eax, eax |
||
3993 | jmp hd_extend_file.start_extend |
||
3994 | |||
3995 | ; extends file on hd to given size (new data area is undefined) |
||
3996 | ; in: edi->direntry, ecx=new size |
||
3997 | ; out: CF=0 => OK, eax destroyed |
||
3998 | ; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL or 11) |
||
3999 | hd_extend_file: |
||
4000 | push ebp |
||
4001 | mov ebp, [SECTORS_PER_CLUSTER] |
||
4002 | imul ebp, [BYTES_PER_SECTOR] |
||
4003 | push ecx |
||
4004 | ; find the last cluster of file |
||
4005 | mov eax, [edi+20-2] |
||
4006 | mov ax, [edi+26] |
||
4007 | mov ecx, [edi+28] |
||
4008 | jecxz .zero_size |
||
4009 | .last_loop: |
||
4010 | sub ecx, ebp |
||
4011 | jbe .last_found |
||
4012 | call get_FAT |
||
4013 | cmp [hd_error], 0 |
||
4014 | jz @f |
||
4015 | .device_err: |
||
4016 | pop ecx |
||
4017 | .device_err2: |
||
4018 | pop ebp |
||
4019 | push 11 |
||
4020 | .ret_err: |
||
4021 | pop eax |
||
4022 | stc |
||
4023 | ret |
||
4024 | @@: |
||
4025 | cmp eax, 2 |
||
4026 | jb .fat_err |
||
4027 | cmp eax, [fatRESERVED] |
||
4028 | jb .last_loop |
||
4029 | .fat_err: |
||
4030 | pop ecx ebp |
||
4031 | push ERROR_FAT_TABLE |
||
4032 | jmp .ret_err |
||
4033 | .last_found: |
||
4034 | push eax |
||
4035 | call get_FAT |
||
4036 | cmp [hd_error], 0 |
||
4037 | jz @f |
||
4038 | pop eax |
||
4039 | jmp .device_err |
||
4040 | @@: |
||
4041 | cmp eax, [fatRESERVED] |
||
4042 | pop eax |
||
4043 | jb .fat_err |
||
4044 | ; set length to full number of clusters |
||
4045 | sub [edi+28], ecx |
||
4046 | .start_extend: |
||
4047 | pop ecx |
||
4048 | ; now do extend |
||
4049 | push edx |
||
4050 | mov edx, 2 ; start scan from cluster 2 |
||
4051 | .extend_loop: |
||
4052 | cmp [edi+28], ecx |
||
4053 | jae .extend_done |
||
4054 | ; add new cluster |
||
4055 | push eax |
||
4056 | mov eax, edx |
||
4057 | call get_free_FAT |
||
4058 | jc .disk_full |
||
4059 | mov edx, [fatEND] |
||
4060 | call set_FAT |
||
4061 | mov edx, eax |
||
4062 | pop eax |
||
4063 | test eax, eax |
||
4064 | jz .first_cluster |
||
4065 | push edx |
||
4066 | call set_FAT |
||
4067 | pop edx |
||
4068 | jmp @f |
||
4069 | .first_cluster: |
||
4070 | ror edx, 16 |
||
4071 | mov [edi+20], dx |
||
4072 | ror edx, 16 |
||
4073 | mov [edi+26], dx |
||
4074 | @@: |
||
4075 | mov eax, edx |
||
4076 | cmp [hd_error], 0 |
||
4077 | jnz .device_err3 |
||
4078 | add [edi+28], ebp |
||
4079 | jmp .extend_loop |
||
4080 | .extend_done: |
||
4081 | mov [edi+28], ecx |
||
4082 | pop edx ebp |
||
4083 | clc |
||
4084 | ret |
||
4085 | .device_err3: |
||
4086 | pop edx |
||
4087 | jmp .device_err2 |
||
4088 | .disk_full: |
||
4089 | pop eax edx ebp |
||
4090 | push ERROR_DISK_FULL |
||
4091 | pop eax |
||
4092 | cmp [hd_error], 0 |
||
4093 | jz @f |
||
4094 | mov al, 11 |
||
4095 | @@: stc |
||
4096 | ret |
||
4097 | |||
129 | mikedld | 4098 | fs_HdGetFileInfo: |
4099 | cmp [fat_type], 0 |
||
4100 | jnz @f |
||
4101 | mov eax, ERROR_UNKNOWN_FS |
||
4102 | ret |
||
4103 | @@: |
||
4104 | cmp byte [esi], 0 |
||
4105 | jnz @f |
||
4106 | mov eax, 2 |
||
4107 | ret |
||
4108 | @@: |
||
4109 | push edi |
||
4110 | call hd_find_lfn |
||
4111 | pushfd |
||
4112 | cmp [hd_error], 0 |
||
4113 | jz @f |
||
4114 | popfd |
||
4115 | pop edi |
||
4116 | mov eax, 11 |
||
4117 | ret |
||
4118 | @@: |
||
4119 | popfd |
||
4120 | jmp fs_GetFileInfo_finish |
||
4121 | |||
4122 | fs_HdSetFileInfo: |
||
4123 | cmp [fat_type], 0 |
||
4124 | jnz @f |
||
4125 | mov eax, ERROR_UNKNOWN_FS |
||
4126 | ret |
||
4127 | @@: |
||
4128 | cmp byte [esi], 0 |
||
4129 | jnz @f |
||
4130 | mov eax, 2 |
||
4131 | ret |
||
4132 | @@: |
||
4133 | push edi |
||
4134 | call hd_find_lfn |
||
4135 | pushfd |
||
4136 | cmp [hd_error], 0 |
||
4137 | jz @f |
||
4138 | popfd |
||
4139 | pop edi |
||
4140 | mov eax, 11 |
||
4141 | ret |
||
4142 | @@: |
||
4143 | popfd |
||
4144 | jnc @f |
||
4145 | pop edi |
||
4146 | mov eax, ERROR_FILE_NOT_FOUND |
||
4147 | ret |
||
4148 | @@: |
||
4149 | push eax |
||
4150 | call bdfe_to_fat_entry |
||
4151 | pop eax |
||
4152 | mov ebx, buffer |
||
4153 | call hd_write |
||
4154 | call update_disk |
||
4155 | pop edi |
||
4156 | xor eax, eax |
||
4157 | ret |
||
4158 | |||
4159 | ;---------------------------------------------------------------- |
||
4160 | ; |
||
4161 | ; fs_HdExecute - LFN variant for executing from harddisk |
||
4162 | ; |
||
4163 | ; esi points to hd filename (e.g. 'dir1/name') |
||
4164 | ; ebp points to full filename (e.g. '/hd0/1/dir1/name') |
||
4165 | ; dword [ebx] = flags |
||
4166 | ; dword [ebx+4] = cmdline |
||
4167 | ; |
||
4168 | ; ret ebx,edx destroyed |
||
4169 | ; eax > 0 - PID, < 0 - error |
||
4170 | ; |
||
4171 | ;-------------------------------------------------------------- |
||
4172 | fs_HdExecute: |
||
4173 | mov edx, [ebx] |
||
4174 | mov ebx, [ebx+4] |
||
4175 | test ebx, ebx |
||
4176 | jz @f |
||
4177 | add ebx, std_application_base_address |
||
4178 | @@: |
||
4179 | |||
4180 | ;---------------------------------------------------------------- |
||
4181 | ; |
||
4182 | ; fs_HdExecute.flags - second entry |
||
4183 | ; |
||
4184 | ; esi points to floppy filename (kernel address) |
||
4185 | ; ebp points to full filename |
||
4186 | ; edx flags |
||
4187 | ; ebx cmdline (kernel address) |
||
4188 | ; |
||
4189 | ; ret eax > 0 - PID, < 0 - error |
||
4190 | ; |
||
4191 | ;-------------------------------------------------------------- |
||
4192 | |||
4193 | .flags: |
||
4194 | cmp [fat_type], 0 |
||
4195 | jnz @f |
||
4196 | mov eax, ERROR_UNKNOWN_FS |
||
4197 | ret |
||
4198 | @@: |
||
4199 | cmp byte [esi], 0 |
||
4200 | jnz @f |
||
4201 | ; cannot execute root! |
||
4202 | mov eax, -ERROR_ACCESS_DENIED |
||
4203 | ret |
||
4204 | @@: |
||
4205 | push edi |
||
4206 | call hd_find_lfn |
||
4207 | jnc .found |
||
4208 | pop edi |
||
4209 | mov eax, -ERROR_FILE_NOT_FOUND |
||
4210 | cmp [hd_error], 0 |
||
4211 | jz @f |
||
4212 | mov al, -11 |
||
4213 | @@: |
||
4214 | ret |
||
4215 | .found: |
||
4216 | mov eax, [edi+20-2] |
||
4217 | mov ax, [edi+26] |
||
4218 | push 0 |
||
4219 | push eax |
||
4220 | push dword [edi+28] ; size |
||
4221 | push .DoRead |
||
4222 | call fs_execute |
||
4223 | add esp, 16 |
||
4224 | pop edi |
||
4225 | ret |
||
4226 | |||
4227 | .DoRead: |
||
4228 | ; read next block |
||
4229 | ; in: eax->parameters, edi->buffer |
||
4230 | ; out: eax = error code |
||
4231 | pushad |
||
4232 | cmp dword [eax], 0 ; file size |
||
4233 | jz .eof |
||
4234 | add eax, 4 |
||
4235 | call fat_get_sector |
||
4236 | mov ebx, edi |
||
4237 | call hd_read |
||
4238 | cmp [hd_error], 0 |
||
4239 | jnz .err |
||
4240 | mov eax, [esp+28] |
||
4241 | mov ecx, [eax] |
||
4242 | sub ecx, 512 |
||
4243 | jae @f |
||
4244 | lea edi, [edi+ecx+512] |
||
4245 | neg ecx |
||
4246 | push eax |
||
4247 | xor eax, eax |
||
4248 | rep stosb |
||
4249 | pop eax |
||
4250 | @@: |
||
4251 | mov [eax], ecx |
||
4252 | mov edx, [eax+8] |
||
4253 | inc edx |
||
4254 | cmp edx, [SECTORS_PER_CLUSTER] |
||
4255 | jb @f |
||
4256 | push eax |
||
4257 | mov eax, [eax+4] |
||
4258 | call get_FAT |
||
4259 | cmp [hd_error], 0 |
||
4260 | jnz .err |
||
4261 | mov ecx, eax |
||
4262 | pop eax |
||
4263 | mov [eax+4], ecx |
||
4264 | xor edx, edx |
||
4265 | @@: |
||
4266 | mov [eax+8], edx |
||
4267 | popad |
||
4268 | xor eax, eax |
||
4269 | ret |
||
4270 | .eof: |
||
4271 | popad |
||
4272 | mov eax, 6 |
||
4273 | ret |
||
4274 | .err: |
||
4275 | popad |
||
4276 | mov eax, 11 |
||
4277 | ret |
||
4278 | |||
4279 | ; \end{diamond}>>=>=>>>>> |