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Rev | Author | Line No. | Line |
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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; FAT32.INC ;; |
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4 | ;; ;; |
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5 | ;; FAT16/32 functions for MenuetOS ;; |
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6 | ;; ;; |
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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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10 | ;; ;; |
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71 | diamond | 11 | ;; 23.04.2006 LFN read - diamond ;; |
65 | mario79 | 12 | ;; 28.01.2006 find all Fat16/32 partition in all input point ;; |
13 | ;; to MBR, see file part_set.inc - Mario79 ;; |
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1 | ha | 14 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
15 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
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16 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
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17 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
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18 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
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19 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
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20 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
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21 | ;; 08.11.2004 rename - ATV ;; |
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22 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
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23 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
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24 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
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25 | ;; 06.9.2004 Fix free space by Mario79 added - MH ;; |
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26 | ;; 24.5.2004 Write back buffer for File_write -VT ;; |
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27 | ;; 20.5.2004 File_read function to work with syscall 58 - VT ;; |
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28 | ;; 30.3.2004 Error parameters at function return - VT ;; |
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29 | ;; 01.5.2002 Bugfix in device write - VT ;; |
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30 | ;; 20.5.2002 Hd status check - VT ;; |
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31 | ;; 29.6.2002 Improved fat32 verification - VT ;; |
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32 | ;; ;; |
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33 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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34 | |||
35 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
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36 | |||
52 | mikedld | 37 | ERROR_SUCCESS = 0 |
38 | ERROR_DISK_BASE = 1 |
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39 | ERROR_UNSUPPORTED_FS = 2 |
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40 | ERROR_UNKNOWN_FS = 3 |
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41 | ERROR_PARTITION = 4 |
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42 | ERROR_FILE_NOT_FOUND = 5 |
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43 | ERROR_END_OF_FILE = 6 |
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44 | ERROR_MEMORY_POINTER = 7 |
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45 | ERROR_DISK_FULL = 8 |
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46 | ERROR_FAT_TABLE = 9 |
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47 | ERROR_ACCESS_DENIED = 10 |
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1 | ha | 48 | |
49 | PUSHAD_EAX equ [esp+28] |
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50 | PUSHAD_ECX equ [esp+24] |
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51 | PUSHAD_EDX equ [esp+20] |
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52 | PUSHAD_EBX equ [esp+16] |
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53 | PUSHAD_EBP equ [esp+8] |
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54 | PUSHAD_ESI equ [esp+4] |
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55 | PUSHAD_EDI equ [esp+0] |
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56 | |||
57 | cluster dd 0 ; used by file_write,makedir,append |
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58 | partition_count dd 0 ; partitions found by set_FAT32_variables |
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59 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
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60 | longname_sec2 dd 0 ; directory sectors for delete long filename |
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61 | |||
62 | hd_error dd 0 ; set by wait_for_sector_buffer |
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63 | hd_setup dd 0 |
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64 | hd_wait_timeout dd 0 |
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65 | |||
66 | cluster_tmp dd 0 ; used by analyze_directory |
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67 | ; and analyze_directory_to_write |
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68 | |||
69 | file_size dd 0 ; used by file_read |
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70 | |||
71 | sector_tmp dd 0 ; used by rename,append,file_write |
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72 | entry_pos dd 0 ; used by rename,append,file_write |
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73 | |||
74 | old_filesize dd 0 ; used by append |
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75 | new_filepos dd 0 ; used by append |
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76 | bytes2write dd 0 ; used by append |
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77 | |||
78 | cache_search_start dd 0 ; used by find_empty_slot |
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79 | |||
80 | fat_in_cache dd -1 |
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81 | fat_cache: times 512 db 0 |
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82 | |||
83 | uglobal |
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84 | Sector512: ; label for dev_hdcd.inc |
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85 | buffer: times 512 db 0 |
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86 | deltree_buffer: times 512 db 0 |
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87 | endg |
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88 | |||
89 | iglobal |
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90 | NewDirEntry1 db ". ",0x10 |
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91 | times 20 db 0 |
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92 | NewDirEntry2 db ".. ",0x10 |
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93 | times 20 db 0 |
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94 | endg |
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95 | |||
96 | uglobal |
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97 | dir_entry: times 32 db 0 |
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98 | |||
99 | startpath: times 255 db 0 |
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100 | |||
101 | fat16_root db 0 ; flag for fat16 rootdir |
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102 | f_del db 0 ; 1=overwrite fat entry |
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103 | fat_change db 0 ; 1=fat has changed |
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104 | |||
105 | endg |
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106 | |||
107 | reserve_hd1: |
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108 | |||
109 | cli |
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110 | cmp [hd1_status],0 |
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111 | je reserve_ok1 |
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112 | |||
113 | sti |
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114 | call change_task |
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115 | jmp reserve_hd1 |
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116 | |||
117 | reserve_ok1: |
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118 | |||
119 | push eax |
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120 | mov eax,[0x3000] |
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121 | shl eax,5 |
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122 | mov eax,[eax+0x3000+4] |
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123 | mov [hd1_status],eax |
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124 | pop eax |
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125 | sti |
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126 | ret |
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127 | |||
128 | |||
129 | clear_hd_cache: |
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130 | |||
131 | push eax ecx edi |
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132 | mov edi,0x600000 |
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133 | mov ecx,16384 |
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134 | xor eax,eax |
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135 | cld |
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136 | rep stosd ; clear hd cache with 0 |
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137 | mov [cache_search_start],eax |
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138 | mov [fat_in_cache],-1 |
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139 | mov [fat_change],0 |
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140 | pop edi ecx eax |
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141 | ret |
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142 | |||
143 | problem_partition db 0 ; used for partitions search |
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144 | |||
65 | mario79 | 145 | include 'part_set.inc' |
1 | ha | 146 | |
147 | set_FAT: |
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148 | ;-------------------------------- |
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149 | ; input : EAX = cluster |
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150 | ; EDX = value to save |
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151 | ; output : EDX = old value |
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152 | ;-------------------------------- |
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153 | push eax ebx esi |
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154 | |||
155 | cmp eax,2 |
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156 | jb sfc_error |
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157 | cmp eax,[LAST_CLUSTER] |
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158 | ja sfc_error |
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159 | cmp [fat_type],16 |
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160 | je sfc_1 |
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161 | add eax,eax |
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162 | sfc_1: |
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163 | add eax,eax |
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164 | mov esi,511 |
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165 | and esi,eax ; esi = position in fat sector |
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166 | shr eax,9 ; eax = fat sector |
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167 | add eax,[FAT_START] |
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168 | mov ebx,fat_cache |
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169 | |||
170 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
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171 | je sfc_in_cache ; yes |
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172 | |||
173 | cmp [fat_change],0 ; is fat changed? |
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174 | je sfc_no_change ; no |
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175 | call write_fat_sector ; yes. write it into disk |
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176 | |||
177 | sfc_no_change: |
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178 | mov [fat_in_cache],eax ; save fat sector |
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179 | call hd_read |
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180 | |||
181 | sfc_in_cache: |
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182 | cmp [fat_type],16 |
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183 | jne sfc_test32 |
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184 | |||
185 | cmp [f_del],1 ; overwrite previous value? |
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186 | je sfc_set16 ; yes |
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187 | cmp word [ebx+esi],0 ; is cluster free? |
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188 | je sfc_set16 ; yes |
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189 | mov dword [8*0x100000],0xffffff |
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190 | mov edx,[ebx+esi] ; get old value |
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191 | jmp sfc_nonzero |
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192 | |||
193 | sfc_set16: |
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194 | xchg [ebx+esi],dx ; save new value and get old value |
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195 | jmp sfc_write |
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196 | |||
197 | sfc_test32: |
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198 | mov eax,[fatMASK] |
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199 | cmp [f_del],1 ; overwrite previous value? |
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200 | je sfc_set32 ; yes |
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201 | test eax,[ebx+esi] ; is cluster free? |
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202 | je sfc_set32 ; yes |
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203 | mov dword [8*0x100000],0xffffff |
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204 | mov edx,[ebx+esi] ; get old value |
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205 | jmp sfc_nonzero |
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206 | |||
207 | sfc_set32: |
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208 | and edx,eax |
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209 | xor eax,-1 ; mask for high bits |
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210 | and eax,[ebx+esi] ; get high 4 bits |
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211 | or eax,edx |
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212 | mov edx,[ebx+esi] ; get old value |
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213 | mov [ebx+esi],eax ; save new value |
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214 | |||
215 | sfc_write: |
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216 | mov [fat_change],1 ; fat has changed |
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217 | |||
218 | sfc_nonzero: |
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219 | and edx,[fatMASK] |
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220 | |||
221 | sfc_error: |
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222 | pop esi ebx eax |
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223 | ret |
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224 | |||
225 | |||
226 | get_FAT: |
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227 | ;-------------------------------- |
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228 | ; input : EAX = cluster |
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229 | ; output : EAX = next cluster |
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230 | ;-------------------------------- |
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231 | push ebx esi |
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232 | |||
233 | cmp [fat_type],16 |
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234 | je gfc_1 |
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235 | add eax,eax |
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236 | gfc_1: |
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237 | add eax,eax |
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238 | mov esi,511 |
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239 | and esi,eax ; esi = position in fat sector |
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240 | shr eax,9 ; eax = fat sector |
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241 | add eax,[FAT_START] |
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242 | mov ebx,fat_cache |
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243 | |||
244 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
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245 | je gfc_in_cache |
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246 | |||
247 | cmp [fat_change],0 ; is fat changed? |
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248 | je gfc_no_change ; no |
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249 | call write_fat_sector ; yes. write it into disk |
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250 | |||
251 | gfc_no_change: |
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252 | mov [fat_in_cache],eax |
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253 | call hd_read |
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254 | |||
255 | gfc_in_cache: |
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256 | mov eax,[ebx+esi] |
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257 | and eax,[fatMASK] |
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258 | pop esi ebx |
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259 | ret |
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260 | |||
261 | |||
262 | get_free_FAT: |
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263 | ;----------------------------------------------------------- |
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264 | ; input : EAX = # cluster for start the searching |
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265 | ; output : if CARRY=0 EAX = # first cluster found free |
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266 | ; if CARRY=1 disk full |
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267 | ; Note : for more speed need to use fat_cache directly |
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268 | ;----------------------------------------------------------- |
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269 | push ecx |
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270 | mov ecx,[LAST_CLUSTER] ; counter for full disk |
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271 | sub ecx,2 |
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272 | |||
273 | gff_test: |
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274 | cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2 |
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275 | jbe gff_in_range |
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276 | mov eax,2 |
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277 | |||
278 | gff_in_range: |
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279 | push eax |
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280 | call get_FAT ; get cluster state |
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281 | test eax,eax ; is it free? |
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282 | pop eax |
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283 | je gff_found ; yes |
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284 | inc eax ; next cluster |
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285 | dec ecx ; is all checked? |
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286 | jns gff_test ; no |
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287 | |||
288 | gff_not_found: |
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289 | pop ecx ; yes. disk is full |
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290 | stc |
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291 | ret |
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292 | |||
293 | gff_found: |
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294 | pop ecx |
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295 | clc |
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296 | ret |
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297 | |||
298 | |||
299 | write_fat_sector: |
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300 | ;----------------------------------------------------------- |
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301 | ; write changed fat to disk |
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302 | ;----------------------------------------------------------- |
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303 | push eax ebx ecx |
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304 | |||
305 | mov [fat_change],0 |
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306 | mov eax,[fat_in_cache] |
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307 | cmp eax,-1 |
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308 | jz write_fat_not_used |
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309 | mov ebx,fat_cache |
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310 | mov ecx,[NUMBER_OF_FATS] |
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311 | |||
312 | write_next_fat: |
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313 | call hd_write |
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314 | add eax,[SECTORS_PER_FAT] |
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315 | dec ecx |
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316 | jnz write_next_fat |
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317 | |||
318 | write_fat_not_used: |
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319 | pop ecx ebx eax |
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320 | ret |
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321 | |||
322 | |||
323 | analyze_directory: |
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324 | ;----------------------------------------------------------- |
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325 | ; input : EAX = first cluster of the directory |
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326 | ; EBX = pointer to filename |
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327 | ; output : IF CARRY=0 EAX = sector where th file is found |
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328 | ; EBX = pointer in buffer |
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329 | ; [buffer .. buffer+511] |
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330 | ; ECX,EDX,ESI,EDI not changed |
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331 | ; IF CARRY=1 filename not found |
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332 | ; Note : if cluster=0 it's changed to read rootdir |
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333 | ; save 2 previous directory sectors in longname_sec |
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334 | ;----------------------------------------------------------- |
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335 | push ecx edx esi edi ebx ; ebx = [esp+0] |
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336 | mov [longname_sec1],0 |
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337 | mov [longname_sec2],0 |
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338 | |||
339 | adr_new_cluster: |
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340 | mov [cluster_tmp],eax |
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341 | mov [fat16_root],0 |
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342 | cmp eax,[LAST_CLUSTER] |
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343 | ja adr_not_found ; too big cluster number, something is wrong |
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344 | cmp eax,2 |
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345 | jnb adr_data_cluster |
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346 | |||
347 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
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348 | cmp [fat_type],16 |
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349 | jne adr_data_cluster |
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350 | mov eax,[ROOT_START] |
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351 | mov edx,[ROOT_SECTORS] |
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352 | mov [fat16_root],1 ; flag for fat16 rootdir |
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353 | jmp adr_new_sector |
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354 | |||
355 | adr_data_cluster: |
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356 | sub eax,2 |
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357 | mov edx,[SECTORS_PER_CLUSTER] |
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358 | imul eax,edx |
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359 | add eax,[DATA_START] |
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360 | |||
361 | adr_new_sector: |
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362 | mov ebx,buffer |
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363 | call hd_read |
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364 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
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365 | |||
366 | adr_analyze: |
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367 | mov edi,[ebx+11] ; file attribute |
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368 | and edi,0xf |
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369 | cmp edi,0xf |
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370 | je adr_long_filename |
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371 | test edi,0x8 ; skip over volume label |
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372 | jne adr_long_filename ; Note: label can be same name as file/dir |
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373 | |||
374 | mov esi,[esp+0] ; filename need to be uppercase |
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375 | mov edi,ebx |
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376 | push ecx |
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377 | mov ecx,11 |
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378 | cld |
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379 | rep cmpsb ; compare 8+3 filename |
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380 | pop ecx |
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381 | je adr_found |
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382 | |||
383 | adr_long_filename: |
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384 | add ebx,32 ; position of next dir entry |
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385 | dec ecx |
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386 | jnz adr_analyze |
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387 | |||
388 | mov ecx,[longname_sec1] ; save 2 previous directory sectors |
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389 | mov [longname_sec1],eax ; for delete long filename |
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390 | mov [longname_sec2],ecx |
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391 | inc eax ; next sector |
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392 | dec edx |
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393 | jne adr_new_sector |
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394 | cmp [fat16_root],1 ; end of fat16 rootdir |
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395 | je adr_not_found |
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396 | |||
397 | adr_next_cluster: |
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398 | mov eax,[cluster_tmp] |
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399 | call get_FAT ; get next cluster |
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400 | cmp eax,2 ; incorrect fat chain? |
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401 | jb adr_not_found ; yes |
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402 | cmp eax,[fatRESERVED] ; is it end of directory? |
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403 | jb adr_new_cluster ; no. analyse it |
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404 | |||
405 | adr_not_found: |
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406 | pop edi edi esi edx ecx ; first edi will remove ebx |
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407 | stc ; file not found |
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408 | ret |
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409 | |||
410 | adr_found: |
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411 | pop edi edi esi edx ecx ; first edi will remove ebx |
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412 | clc ; file found |
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413 | ret |
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414 | |||
415 | |||
416 | analyze_directory_to_write: |
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417 | ;----------------------------------------------------------- |
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418 | ; input : EAX = first cluster of the directory |
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419 | ; output : IF CARRY=0 EAX = sector where the empty pos is found |
||
420 | ; EBX = pointer in buffer |
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421 | ; [buffer .. buffer+511] |
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422 | ; ECX,EDX,ESI,EDI not changed |
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423 | ; IF CARRY=1 disk full or fat corrupted |
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424 | ; Note : if cluster=0 it's changed to read rootdir |
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425 | ;----------------------------------------------------------- |
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426 | push ecx edx edi |
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427 | |||
428 | adw_new_cluster: |
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429 | mov [cluster_tmp],eax |
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430 | mov [fat16_root],0 |
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431 | cmp eax,[LAST_CLUSTER] |
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432 | ja adw_not_found ; too big cluster number, something is wrong |
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433 | cmp eax,2 |
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434 | jnb adw_data_cluster |
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435 | |||
436 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
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437 | cmp [fat_type],16 |
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438 | jne adw_data_cluster |
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439 | mov eax,[ROOT_START] |
||
440 | mov edx,[ROOT_SECTORS] |
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441 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
442 | jmp adw_new_sector |
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443 | |||
444 | adw_data_cluster: |
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445 | sub eax,2 |
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446 | mov edx,[SECTORS_PER_CLUSTER] |
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447 | imul eax,edx |
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448 | add eax,[DATA_START] |
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449 | |||
450 | adw_new_sector: |
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451 | mov ebx,buffer |
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452 | call hd_read |
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453 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
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454 | |||
455 | adw_analyze: |
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456 | cmp byte [ebx],0x00 ; is free entry? |
||
457 | je adw_found ; yes |
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458 | cmp byte [ebx],0xe5 ; is deleted entry? |
||
459 | je adw_found ; yes |
||
460 | add ebx,32 ; position of next dir entry |
||
461 | dec ecx |
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462 | jnz adw_analyze |
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463 | |||
464 | inc eax ; next sector |
||
465 | dec edx |
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466 | jne adw_new_sector |
||
467 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
468 | je adw_not_found |
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469 | |||
470 | mov eax,[cluster_tmp] |
||
471 | call get_FAT ; get next cluster |
||
472 | cmp eax,2 ; incorrect fat chain? |
||
473 | jb adw_not_found ; yes |
||
474 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
475 | jb adw_new_cluster ; no. analyse it |
||
476 | |||
477 | mov eax,2 ; this block of code add a new cluster |
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478 | call get_free_FAT ; for the directory because the directory |
||
479 | jc adw_not_found ; is full |
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480 | |||
481 | mov edx,[fatEND] ; new end for directory |
||
482 | call set_FAT |
||
483 | |||
484 | push eax ; save new cluster |
||
485 | mov edx,eax |
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486 | mov eax,[cluster_tmp] ; change last cluster to point new cluster |
||
487 | mov [f_del],1 |
||
488 | call set_FAT |
||
489 | mov [f_del],0 |
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490 | |||
491 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
492 | call add_disk_free_space |
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493 | |||
494 | mov ecx,512/4 |
||
495 | xor eax,eax |
||
496 | mov edi,buffer |
||
497 | cld |
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498 | rep stosd ; clear new directory cluster |
||
499 | pop eax |
||
500 | |||
501 | sub eax,2 |
||
502 | mov ecx,[SECTORS_PER_CLUSTER] |
||
503 | imul eax,ecx |
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504 | add eax,[DATA_START] |
||
505 | mov ebx,buffer |
||
506 | push eax ; save sector number |
||
507 | |||
508 | adw_set_empty_directory: |
||
509 | call hd_write |
||
510 | inc eax ; next sector |
||
511 | dec ecx |
||
512 | jnz adw_set_empty_directory |
||
513 | |||
514 | pop eax |
||
515 | |||
516 | adw_found: |
||
517 | pop edi edx ecx |
||
518 | clc ; free space found |
||
519 | ret |
||
520 | |||
521 | adw_not_found: |
||
522 | pop edi edx ecx |
||
523 | stc ; free space not found |
||
524 | ret |
||
525 | |||
526 | |||
527 | get_data_cluster: |
||
528 | ;----------------------------------------------------------- |
||
529 | ; input : EAX = cluster |
||
530 | ; EBX = pointer to buffer |
||
531 | ; EDX = # blocks to read in buffer |
||
532 | ; ESI = # blocks to skip over |
||
533 | ; output : if CARRY=0 ok EBX/EDX/ESI updated |
||
534 | ; if CARRY=1 cluster out of range |
||
535 | ; Note : if cluster=0 it's changed to read rootdir |
||
536 | ;----------------------------------------------------------- |
||
537 | push eax ecx |
||
538 | |||
539 | mov [fat16_root],0 |
||
540 | cmp eax,[LAST_CLUSTER] |
||
541 | ja gdc_error ; too big cluster number, something is wrong |
||
542 | cmp eax,2 |
||
543 | jnb gdc_cluster |
||
544 | |||
545 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
546 | cmp [fat_type],16 |
||
547 | jne gdc_cluster |
||
548 | mov eax,[ROOT_START] |
||
549 | mov ecx,[ROOT_SECTORS] ; Note: not cluster size |
||
550 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
551 | jmp gdc_read |
||
552 | |||
553 | gdc_cluster: |
||
554 | sub eax,2 |
||
555 | mov ecx,[SECTORS_PER_CLUSTER] |
||
556 | imul eax,ecx |
||
557 | add eax,[DATA_START] |
||
558 | |||
559 | gdc_read: |
||
560 | test esi,esi ; first wanted block |
||
561 | je gdcl1 ; yes, skip count is 0 |
||
562 | dec esi |
||
563 | jmp gdcl2 |
||
564 | |||
565 | gdcl1: |
||
566 | call hd_read |
||
567 | add ebx,512 ; update pointer |
||
568 | dec edx |
||
569 | |||
570 | gdcl2: |
||
571 | test edx,edx ; is all read? |
||
572 | je out_of_read |
||
573 | |||
574 | inc eax ; next sector |
||
575 | dec ecx |
||
576 | jnz gdc_read |
||
577 | |||
578 | out_of_read: |
||
579 | pop ecx eax |
||
580 | clc |
||
581 | ret |
||
582 | |||
583 | gdc_error: |
||
584 | pop ecx eax |
||
585 | stc |
||
586 | ret |
||
587 | |||
588 | |||
589 | set_data_cluster: |
||
590 | ;----------------------------------------------------------- |
||
591 | ; input : EAX = cluster |
||
592 | ; EBX = pointer to buffer |
||
593 | ; output : if CARRY=0 ok |
||
594 | ; if CARRY=1 cluster out of range |
||
595 | ;----------------------------------------------------------- |
||
596 | push eax ebx edx |
||
597 | |||
598 | cmp eax,[LAST_CLUSTER] |
||
599 | ja sdc_error ; too big cluster number, something is wrong |
||
600 | sub eax,2 |
||
601 | jb sdc_error ; don't allow rootdir write |
||
602 | |||
603 | mov edx,[SECTORS_PER_CLUSTER] |
||
604 | imul eax,edx |
||
605 | add eax,[DATA_START] |
||
606 | |||
607 | sdc_write: |
||
608 | call hd_write |
||
609 | add ebx,512 ; update pointer |
||
610 | inc eax |
||
611 | dec edx |
||
612 | jnz sdc_write |
||
613 | pop edx ebx eax |
||
614 | clc |
||
615 | ret |
||
616 | |||
617 | sdc_error: |
||
618 | pop edx ebx eax |
||
619 | stc |
||
620 | ret |
||
621 | |||
622 | |||
623 | get_cluster_of_a_path: |
||
624 | ;--------------------------------------------------------- |
||
625 | ; input : EBX = pointer to a path string |
||
626 | ; (example: the path "/files/data/document" become |
||
627 | ; "files......data.......document...0" |
||
628 | ; '.' = space char |
||
629 | ; '0' = char(0) (ASCII=0) !!! ) |
||
630 | ; output : if (CARRY=1) -> ERROR in the PATH |
||
631 | ; if (CARRY=0) -> EAX=cluster |
||
632 | ;--------------------------------------------------------- |
||
633 | push ebx edx |
||
634 | |||
635 | mov eax,[ROOT_CLUSTER] |
||
636 | mov edx,ebx |
||
637 | |||
638 | search_end_of_path: |
||
639 | cmp byte [edx],0 |
||
640 | je found_end_of_path |
||
641 | |||
642 | inc edx ; '/' |
||
643 | mov ebx,edx |
||
644 | call analyze_directory |
||
645 | jc directory_not_found |
||
646 | |||
647 | mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field |
||
648 | mov ax,[ebx+26] ; read the LOW 16bit cluster field |
||
649 | and eax,[fatMASK] |
||
650 | add edx,11 ; 8+3 (name+extension) |
||
651 | jmp search_end_of_path |
||
652 | |||
653 | found_end_of_path: |
||
654 | pop edx ebx |
||
655 | clc ; no errors |
||
656 | ret |
||
657 | |||
658 | directory_not_found: |
||
659 | pop edx ebx |
||
660 | stc ; errors occour |
||
661 | ret |
||
662 | |||
663 | |||
664 | bcd2bin: |
||
665 | ;---------------------------------- |
||
666 | ; input : AL=BCD number (eg. 0x11) |
||
667 | ; output : AH=0 |
||
668 | ; AL=decimal number (eg. 11) |
||
669 | ;---------------------------------- |
||
670 | xor ah,ah |
||
671 | shl ax,4 |
||
672 | shr al,4 |
||
673 | aad |
||
674 | ret |
||
675 | |||
676 | |||
677 | get_date_for_file: |
||
678 | ;----------------------------------------------------- |
||
679 | ; Get date from CMOS and pack day,month,year in AX |
||
680 | ; DATE bits 0..4 : day of month 0..31 |
||
681 | ; 5..8 : month of year 1..12 |
||
682 | ; 9..15 : count of years from 1980 |
||
683 | ;----------------------------------------------------- |
||
684 | mov al,0x7 ;day |
||
685 | out 0x70,al |
||
686 | in al,0x71 |
||
687 | call bcd2bin |
||
688 | ror eax,5 |
||
689 | |||
690 | mov al,0x8 ;month |
||
691 | out 0x70,al |
||
692 | in al,0x71 |
||
693 | call bcd2bin |
||
694 | ror eax,4 |
||
695 | |||
696 | mov al,0x9 ;year |
||
697 | out 0x70,al |
||
698 | in al,0x71 |
||
699 | call bcd2bin |
||
700 | add ax,20 ;because CMOS return only the two last |
||
701 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
702 | rol eax,9 ;need the difference with 1980 (eg. 2001-1980) |
||
703 | ret |
||
704 | |||
705 | |||
706 | get_time_for_file: |
||
707 | ;----------------------------------------------------- |
||
708 | ; Get time from CMOS and pack hour,minute,second in AX |
||
709 | ; TIME bits 0..4 : second (the low bit is lost) |
||
710 | ; 5..10 : minute 0..59 |
||
711 | ; 11..15 : hour 0..23 |
||
712 | ;----------------------------------------------------- |
||
713 | mov al,0x0 ;second |
||
714 | out 0x70,al |
||
715 | in al,0x71 |
||
716 | call bcd2bin |
||
717 | ror eax,6 |
||
718 | |||
719 | mov al,0x2 ;minute |
||
720 | out 0x70,al |
||
721 | in al,0x71 |
||
722 | call bcd2bin |
||
723 | ror eax,6 |
||
724 | |||
725 | mov al,0x4 ;hour |
||
726 | out 0x70,al |
||
727 | in al,0x71 |
||
728 | call bcd2bin |
||
729 | rol eax,11 |
||
730 | ret |
||
731 | |||
732 | |||
733 | set_current_time_for_entry: |
||
734 | ;----------------------------------------------------- |
||
735 | ; Set current time/date for file entry |
||
736 | ; input : ebx = file entry pointer |
||
737 | ;----------------------------------------------------- |
||
738 | push eax |
||
739 | call get_time_for_file ; update files date/time |
||
740 | mov [ebx+22],ax |
||
741 | call get_date_for_file |
||
742 | mov [ebx+24],ax |
||
743 | pop eax |
||
744 | ret |
||
745 | |||
746 | |||
747 | makedir: |
||
748 | ;----------------------------------------------------- |
||
749 | ; input : eax = directory name |
||
750 | ; edx = path |
||
751 | ; output : eax = 0 - ok |
||
752 | ; 3 - unknown FS |
||
753 | ; 5 - file not found |
||
754 | ; 8 - disk full |
||
755 | ; 10 - access denied |
||
756 | ; Note : can only make one directory at time |
||
757 | ;----------------------------------------------------- |
||
758 | cmp [fat_type],0 |
||
759 | jnz make_dir_fat_ok |
||
760 | mov eax,ERROR_UNKNOWN_FS |
||
761 | ret |
||
762 | |||
763 | make_dir_fat_ok: |
||
764 | ; call reserve_hd1 |
||
765 | |||
766 | pushad |
||
767 | |||
768 | mov ebx,edx |
||
769 | call get_cluster_of_a_path |
||
770 | jnc make_dir_found_path |
||
771 | |||
772 | make_dir_path_not_found: |
||
773 | popad |
||
774 | call update_disk ; write all of cache and fat to hd |
||
775 | mov [hd1_status],0 |
||
776 | mov eax,ERROR_FILE_NOT_FOUND |
||
777 | ret |
||
778 | |||
779 | make_dir_disk_full: |
||
780 | popad |
||
781 | call update_disk ; write all of cache and fat to hd |
||
782 | mov [hd1_status],0 |
||
783 | mov eax,ERROR_DISK_FULL |
||
784 | ret |
||
785 | |||
786 | make_dir_already_exist: |
||
787 | mov eax,[cluster] ; directory cluster |
||
788 | xor edx,edx ; free |
||
789 | mov [f_del],1 |
||
790 | call set_FAT |
||
791 | mov [f_del],0 |
||
792 | |||
793 | popad |
||
794 | call update_disk ; write all of cache and fat to hd |
||
795 | mov [hd1_status],0 |
||
796 | mov eax,ERROR_ACCESS_DENIED |
||
797 | ret |
||
798 | |||
799 | make_dir_found_path: |
||
800 | cmp eax,[ROOT_CLUSTER] |
||
801 | jnz make_dir_not_root |
||
802 | xor eax,eax |
||
803 | |||
804 | make_dir_not_root: |
||
805 | mov ecx,eax ; directorys start cluster |
||
806 | mov word [NewDirEntry2+26],cx ; 16 bits low of cluster |
||
807 | shr ecx,16 |
||
808 | mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16) |
||
809 | |||
810 | push eax ; save parent directory cluster |
||
811 | mov eax,2 |
||
812 | call get_free_FAT |
||
813 | mov [cluster],eax ; first free cluster |
||
814 | pop eax |
||
815 | jc make_dir_disk_full |
||
816 | |||
817 | push eax |
||
818 | mov eax,[cluster] ; directory cluster |
||
819 | mov edx,[fatEND] ; end for directory |
||
820 | call set_FAT |
||
821 | pop eax |
||
822 | |||
823 | mov ebx,PUSHAD_EAX ; dir name |
||
824 | push eax |
||
825 | call analyze_directory ; check if directory already exist |
||
826 | pop eax |
||
827 | jnc make_dir_already_exist ; need to free allocated cluster! |
||
828 | |||
829 | call analyze_directory_to_write |
||
830 | jc make_dir_already_exist ; need to free allocated cluster! |
||
831 | |||
832 | mov esi,PUSHAD_EAX ; dir name |
||
833 | mov edi,ebx ; pointer in buffer |
||
834 | mov ecx,11 |
||
835 | cld |
||
836 | rep movsb |
||
837 | |||
838 | mov dword [ebx+28],0 ; dir size is always 0 |
||
839 | mov ecx,[cluster] |
||
840 | mov [ebx+26],cx ; 16 bits low of cluster |
||
841 | mov word [NewDirEntry1+26],cx |
||
842 | shr ecx,16 |
||
843 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
844 | mov word [NewDirEntry1+20],cx |
||
845 | mov byte [ebx+11],0x10 ; attribute = directory |
||
846 | |||
847 | call set_current_time_for_entry |
||
848 | mov ecx,[ebx+22] |
||
849 | mov dword [NewDirEntry1+22],ecx |
||
850 | mov dword [NewDirEntry2+22],ecx |
||
851 | |||
852 | mov ebx,buffer ; save the directory name,length,cluster |
||
853 | call hd_write |
||
854 | |||
855 | mov ecx,512/4 |
||
856 | xor eax,eax |
||
857 | mov edi,buffer |
||
858 | cld |
||
859 | rep stosd ; clear new directory cluster |
||
860 | |||
861 | mov eax,[cluster] ; new directory cluster |
||
862 | sub eax,2 |
||
863 | mov edx,[SECTORS_PER_CLUSTER] |
||
864 | imul eax,edx |
||
865 | add eax,[DATA_START] |
||
866 | mov ebx,buffer |
||
867 | add eax,edx ; start from last sector |
||
868 | |||
869 | dir_set_empty_directory: |
||
870 | dec eax ; next sector |
||
871 | cmp edx,1 ; is first directory sector? |
||
872 | jnz not_first_sector ; no. write empty sector |
||
873 | mov esi,NewDirEntry1 |
||
874 | mov edi,buffer |
||
875 | mov ecx,64/4 |
||
876 | cld |
||
877 | rep movsd ; copy 2 first directory entrys "." and ".." |
||
878 | |||
879 | not_first_sector: |
||
880 | call hd_write |
||
881 | dec edx |
||
882 | jnz dir_set_empty_directory |
||
883 | |||
884 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
885 | call add_disk_free_space |
||
886 | |||
887 | popad |
||
888 | call update_disk ; write all of cache and fat to hd |
||
889 | mov [hd1_status],0 |
||
890 | xor eax,eax |
||
891 | ret |
||
892 | |||
893 | |||
894 | removedir: |
||
895 | ;----------------------------------------------------- |
||
896 | ; input : eax = file/directory name |
||
897 | ; edx = path |
||
898 | ; output : eax = 0 - ok |
||
899 | ; 3 - unknown FS |
||
900 | ; 5 - file not found |
||
901 | ; 10 - access denied |
||
902 | ;----------------------------------------------------- |
||
903 | cmp [fat_type],0 |
||
904 | jnz remove_dir_fat_ok |
||
905 | mov eax,ERROR_UNKNOWN_FS |
||
906 | ret |
||
907 | |||
908 | remove_dir_fat_ok: |
||
909 | ; call reserve_hd1 |
||
910 | |||
911 | push edi |
||
912 | mov edi,1 ; allow directory remove |
||
913 | call file_delete |
||
914 | pop edi |
||
915 | |||
916 | call update_disk ; write all of cache and fat to hd |
||
917 | mov [hd1_status],0 |
||
918 | ret |
||
919 | |||
920 | |||
921 | add_disk_free_space: |
||
922 | ;----------------------------------------------------- |
||
923 | ; input : ecx = cluster count |
||
924 | ; Note : negative = remove clusters from free space |
||
925 | ; positive = add clusters to free space |
||
926 | ;----------------------------------------------------- |
||
927 | test ecx,ecx ; no change |
||
928 | je add_dfs_no |
||
929 | cmp [fat_type],32 ; free disk space only used by fat32 |
||
930 | jne add_dfs_no |
||
931 | |||
932 | push eax ebx |
||
933 | mov eax,[ADR_FSINFO] |
||
934 | mov ebx,buffer |
||
935 | call hd_read |
||
936 | cmp dword [ebx+0x1fc],0xaa550000 ; check sector id |
||
937 | jne add_not_fs |
||
938 | |||
939 | add [ebx+0x1e8],ecx |
||
940 | call hd_write |
||
941 | |||
942 | add_not_fs: |
||
943 | pop ebx eax |
||
944 | |||
945 | add_dfs_no: |
||
946 | ret |
||
947 | |||
948 | |||
949 | file_append: |
||
950 | ;----------------------------------------------------- |
||
951 | ; input : eax = file name |
||
952 | ; edx = path |
||
953 | ; ecx = pointer to buffer |
||
954 | ; ebx = bytes to write (0 = truncate file) |
||
955 | ; esi = start position (-1 = end of file) |
||
956 | ; output : eax = 0 - ok |
||
957 | ; 3 - unknown FS |
||
958 | ; 5 - file not found |
||
959 | ; 6 - end of file |
||
960 | ; 8 - disk full |
||
961 | ; 9 - fat table corrupted |
||
962 | ; 10 - access denied |
||
963 | ; ebx = bytes written |
||
964 | ;----------------------------------------------------- |
||
965 | cmp [fat_type],0 |
||
966 | jnz append_fat_ok |
||
967 | mov eax,ERROR_UNKNOWN_FS |
||
968 | ret |
||
969 | |||
970 | append_fat_ok: |
||
971 | ; call reserve_hd1 |
||
972 | |||
973 | pushad |
||
974 | |||
975 | mov ebx,edx |
||
976 | call get_cluster_of_a_path |
||
977 | jc append_not_found |
||
978 | |||
979 | mov ebx,PUSHAD_EAX ; file name |
||
980 | call analyze_directory |
||
981 | jc append_not_found |
||
982 | |||
983 | mov [sector_tmp],eax |
||
984 | mov [entry_pos],ebx |
||
985 | |||
986 | test byte [ebx+11],0x10 ; is it directory? |
||
987 | jnz append_access ; yes |
||
988 | |||
989 | mov ecx,[ebx+28] ; file size |
||
990 | mov edi,PUSHAD_ESI ; write position |
||
991 | cmp edi,-1 ; -1 = eof |
||
992 | jnz append_inside_file |
||
993 | mov edi,ecx ; file size |
||
994 | |||
995 | append_inside_file: |
||
996 | cmp edi,ecx ; start above old file size? |
||
997 | ja append_eof ; yes |
||
998 | |||
999 | mov [old_filesize],ecx |
||
1000 | mov [new_filepos],edi |
||
1001 | |||
1002 | mov ecx,PUSHAD_EBX ; bytes to write |
||
1003 | test ecx,ecx ; truncate? |
||
1004 | jz append_truncate ; yes |
||
1005 | |||
1006 | mov [bytes2write],ecx ; bytes to write |
||
1007 | mov esi,PUSHAD_ECX ; pointer to buffer |
||
1008 | mov eax,[ebx+20-2] ; FAT entry |
||
1009 | mov ax,[ebx+26] |
||
1010 | and eax,[fatMASK] |
||
1011 | jnz append_find_pos ; first cluster <> 0 |
||
1012 | |||
1013 | mov eax,2 |
||
1014 | call get_free_FAT |
||
1015 | jc append_disk_full |
||
1016 | mov ecx,eax ; set files first cluster |
||
1017 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1018 | shr ecx,16 |
||
1019 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1020 | mov edx,[fatEND] ; new end for cluster chain |
||
1021 | call set_FAT |
||
1022 | |||
1023 | push eax ; save first cluster |
||
1024 | mov eax,[sector_tmp] |
||
1025 | mov ebx,buffer |
||
1026 | call hd_write ; write new file entry back to disk |
||
1027 | pop eax |
||
1028 | |||
1029 | append_remove_free: |
||
1030 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1031 | call add_disk_free_space ; Note: uses buffer |
||
1032 | |||
1033 | append_found_cluster: |
||
1034 | mov [cluster],eax |
||
1035 | sub eax,2 |
||
1036 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1037 | imul eax,ecx |
||
1038 | add eax,[DATA_START] |
||
1039 | xor edi,edi |
||
1040 | |||
1041 | append_new_sector: |
||
1042 | push ecx |
||
1043 | mov ecx,[bytes2write] ; bytes left in buffer |
||
1044 | mov ebx,512 |
||
1045 | sub ebx,edi ; bytes left in sector |
||
1046 | cmp ecx,ebx |
||
1047 | jb append_bytes_ok |
||
1048 | mov ecx,ebx |
||
1049 | |||
1050 | append_bytes_ok: |
||
1051 | cmp ecx,512 ; overwrite full sector? |
||
1052 | jz append_full_sector ; yes |
||
1053 | mov ebx,buffer ; overwrite part of sector |
||
1054 | call hd_read ; read old sector |
||
1055 | |||
1056 | append_full_sector: |
||
1057 | sub [bytes2write],ecx |
||
1058 | add [new_filepos],ecx |
||
1059 | add edi,buffer |
||
1060 | cld |
||
1061 | rep movsb |
||
1062 | pop ecx |
||
1063 | |||
1064 | mov ebx,buffer |
||
1065 | call hd_write |
||
1066 | cmp [bytes2write],0 ; is all done? |
||
1067 | jz append_done |
||
1068 | xor edi,edi |
||
1069 | inc eax |
||
1070 | dec ecx |
||
1071 | jnz append_new_sector |
||
1072 | |||
1073 | mov eax,[cluster] |
||
1074 | call get_FAT |
||
1075 | cmp eax,2 |
||
1076 | jb append_fat |
||
1077 | cmp eax,[LAST_CLUSTER] |
||
1078 | jbe append_found_cluster |
||
1079 | |||
1080 | append_alloc_cluster: |
||
1081 | mov eax,2 ; ToDo: use temp array to keep track |
||
1082 | call get_free_FAT ; of last free cluster |
||
1083 | jc append_disk_full |
||
1084 | push eax ; save new cluster |
||
1085 | mov edx,[fatEND] ; new end for cluster chain |
||
1086 | call set_FAT |
||
1087 | mov edx,eax |
||
1088 | mov eax,[cluster] |
||
1089 | mov [f_del],1 |
||
1090 | call set_FAT ; update previous cluster |
||
1091 | mov [f_del],0 |
||
1092 | pop eax |
||
1093 | jmp append_remove_free |
||
1094 | |||
1095 | append_find_pos: |
||
1096 | call find_filepos |
||
1097 | mov [cluster],ebx |
||
1098 | jnc append_new_sector |
||
1099 | test edi,edi |
||
1100 | jz append_alloc_cluster |
||
1101 | |||
1102 | append_fat: |
||
1103 | mov eax,ERROR_FAT_TABLE |
||
1104 | jmp append_ret_code |
||
1105 | |||
1106 | append_disk_full: |
||
1107 | mov eax,ERROR_DISK_FULL |
||
1108 | jmp append_ret_code |
||
1109 | |||
1110 | append_done: |
||
1111 | xor eax,eax |
||
1112 | |||
1113 | append_ret_code: |
||
1114 | mov PUSHAD_EAX,eax ; return code |
||
1115 | |||
1116 | mov eax,[sector_tmp] ; update directory entry |
||
1117 | mov ebx,buffer |
||
1118 | call hd_read |
||
1119 | mov ebx,[entry_pos] |
||
1120 | mov ecx,[new_filepos] |
||
1121 | cmp ecx,[old_filesize] ; is file pos above old size? |
||
1122 | jbe append_size_ok ; no |
||
1123 | mov [ebx+28],ecx ; new file size |
||
1124 | |||
1125 | append_size_ok: |
||
1126 | call set_current_time_for_entry |
||
1127 | mov ebx,buffer |
||
1128 | call hd_write ; write new file entry back to disk |
||
1129 | |||
1130 | sub ecx,PUSHAD_ESI ; start position |
||
1131 | mov PUSHAD_EBX,ecx ; bytes written |
||
1132 | popad |
||
1133 | call update_disk ; write all of cache and fat to hd |
||
1134 | mov [hd1_status],0 |
||
1135 | ret |
||
1136 | |||
1137 | append_eof: |
||
1138 | popad |
||
1139 | mov [hd1_status],0 |
||
1140 | xor ebx,ebx |
||
1141 | mov eax,ERROR_END_OF_FILE |
||
1142 | ret |
||
1143 | |||
1144 | append_not_found: |
||
1145 | popad |
||
1146 | mov [hd1_status],0 |
||
1147 | xor ebx,ebx |
||
1148 | mov eax,ERROR_FILE_NOT_FOUND |
||
1149 | ret |
||
1150 | |||
1151 | append_access: |
||
1152 | popad |
||
1153 | mov [hd1_status],0 |
||
1154 | xor ebx,ebx |
||
1155 | mov eax,ERROR_ACCESS_DENIED |
||
1156 | ret |
||
1157 | |||
1158 | append_truncate: |
||
1159 | mov edx,[ebx+20-2] ; FAT entry |
||
1160 | mov dx,[ebx+26] |
||
1161 | and edx,[fatMASK] |
||
1162 | mov [ebx+28],edi ; set new file size |
||
1163 | test edi,edi ; 0 length file? |
||
1164 | jnz truncate_save_size ; no |
||
1165 | mov [ebx+20],di ; FAT entry = 0 |
||
1166 | mov [ebx+26],di |
||
1167 | |||
1168 | truncate_save_size: |
||
1169 | call set_current_time_for_entry |
||
1170 | mov ebx,buffer |
||
1171 | call hd_write |
||
1172 | mov eax,edx ; first cluster |
||
1173 | test edi,edi ; 0 length file? |
||
1174 | jz truncate_clear_chain |
||
1175 | |||
1176 | imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes |
||
1177 | |||
1178 | truncate_new_cluster: |
||
1179 | cmp eax,2 ; incorrect fat chain? |
||
1180 | jb truncate_eof ; yes |
||
1181 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1182 | jnb truncate_eof ; yes |
||
1183 | sub edi,esi |
||
1184 | jbe truncate_pos_found |
||
1185 | call get_FAT ; get next cluster |
||
1186 | jmp truncate_new_cluster |
||
1187 | |||
1188 | truncate_pos_found: |
||
1189 | mov edx,[fatEND] ; new end for cluster chain |
||
1190 | mov [f_del],1 |
||
1191 | call set_FAT |
||
1192 | mov [f_del],0 |
||
1193 | mov eax,edx ; clear rest of chain |
||
1194 | |||
1195 | truncate_clear_chain: |
||
1196 | call clear_cluster_chain |
||
1197 | |||
1198 | truncate_eof: |
||
1199 | popad |
||
1200 | call update_disk ; write all of cache and fat to hd |
||
1201 | mov [hd1_status],0 |
||
1202 | xor ebx,ebx |
||
1203 | xor eax,eax |
||
1204 | ret |
||
1205 | |||
1206 | |||
1207 | find_filepos: |
||
1208 | ;----------------------------------------------------- |
||
1209 | ; input : eax = first cluster |
||
1210 | ; edi = bytes to skip over (start position) |
||
1211 | ; output : if CARRY=0 file position found |
||
1212 | ; if CARRY=1 end of file found |
||
1213 | ; eax = current file sector |
||
1214 | ; ebx = last cluster |
||
1215 | ; ecx = sector count in last cluster |
||
1216 | ; edi = bytes to skip over (sector position) |
||
1217 | ;----------------------------------------------------- |
||
1218 | push esi |
||
1219 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1220 | imul esi,ecx,512 ; esi = cluster size in bytes |
||
1221 | mov ebx,eax |
||
1222 | |||
1223 | filepos_new_cluster: |
||
1224 | cmp eax,2 ; incorrect fat chain? |
||
1225 | jb filepos_eof ; yes |
||
1226 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1227 | jnb filepos_eof ; yes |
||
1228 | |||
1229 | mov ebx,eax |
||
1230 | cmp edi,esi ; skip over full cluster? |
||
1231 | jb filepos_cluster_ok ; no |
||
1232 | |||
1233 | sub edi,esi |
||
1234 | call get_FAT ; get next cluster |
||
1235 | jmp filepos_new_cluster |
||
1236 | |||
1237 | filepos_cluster_ok: |
||
1238 | sub eax,2 |
||
1239 | imul eax,ecx |
||
1240 | add eax,[DATA_START] |
||
1241 | |||
1242 | filepos_new_sector: |
||
1243 | cmp edi,512 ; skip over full sector? |
||
1244 | jb filepos_sector_ok ; no |
||
1245 | sub edi,512 |
||
1246 | inc eax |
||
1247 | dec ecx |
||
1248 | jnz filepos_new_sector |
||
1249 | |||
1250 | filepos_eof: |
||
1251 | pop esi |
||
1252 | stc |
||
1253 | ret |
||
1254 | |||
1255 | filepos_sector_ok: |
||
1256 | pop esi |
||
1257 | clc |
||
1258 | ret |
||
1259 | |||
1260 | |||
1261 | file_write: |
||
1262 | ;-------------------------------------------------------------------------- |
||
1263 | ; INPUT : user-reg register-in-this meaning symbol-in-this-routine |
||
1264 | ; |
||
1265 | ; EAX EDI system call to write / |
||
1266 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1267 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1268 | ; ECX EBX (PAR2) file size PAR2 |
||
1269 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1270 | ; |
||
1271 | ; output : eax = 0 - ok |
||
1272 | ; 3 - unknown FS |
||
1273 | ; 5 - file not found |
||
1274 | ; 8 - disk full |
||
1275 | ; 10 - access denied |
||
1276 | ;-------------------------------------------------------------------------- |
||
1277 | cmp [fat_type],0 |
||
1278 | jnz fat_ok_for_writing |
||
1279 | mov eax,ERROR_UNKNOWN_FS |
||
1280 | ret |
||
1281 | |||
1282 | fat_ok_for_writing: |
||
1283 | ; call reserve_hd1 |
||
1284 | |||
1285 | pushad |
||
1286 | |||
1287 | xor edi,edi ; don't allow directory remove |
||
1288 | call file_delete ; try to delete the file first |
||
1289 | test eax,eax |
||
1290 | jz old_deleted ; deleted ok |
||
1291 | cmp eax,ERROR_FILE_NOT_FOUND |
||
1292 | jnz exit_write_access ; it exist but can't delete |
||
1293 | |||
1294 | old_deleted: |
||
1295 | mov ebx,PUSHAD_EDX |
||
1296 | call get_cluster_of_a_path |
||
1297 | jnc found_directory_for_writing |
||
1298 | |||
1299 | exit_writing_with_error: |
||
1300 | popad |
||
1301 | call update_disk ; write all of cache and fat to hd |
||
1302 | mov [hd1_status],0 |
||
1303 | mov eax,ERROR_FILE_NOT_FOUND |
||
1304 | ret |
||
1305 | |||
1306 | exit_writing_disk_full_clear: |
||
1307 | mov eax,[sector_tmp] |
||
1308 | mov ebx,buffer |
||
1309 | call hd_read ; read directory sector |
||
1310 | mov edx,[entry_pos] |
||
1311 | mov byte [edx],0xe5 ; mark as deleted |
||
1312 | call hd_write |
||
1313 | mov eax,[edx+20-2] ; FAT entry |
||
1314 | mov ax,[edx+26] |
||
1315 | and eax,[fatMASK] |
||
1316 | call clear_cluster_chain |
||
1317 | |||
1318 | exit_writing_disk_full: |
||
1319 | popad |
||
1320 | call update_disk ; write all of cache and fat to hd |
||
1321 | mov [hd1_status],0 |
||
1322 | mov eax,ERROR_DISK_FULL |
||
1323 | ret |
||
1324 | |||
1325 | exit_write_access: |
||
1326 | popad |
||
1327 | call update_disk ; write all of cache and fat to hd |
||
1328 | mov [hd1_status],0 |
||
1329 | mov eax,ERROR_ACCESS_DENIED |
||
1330 | ret |
||
1331 | |||
1332 | found_directory_for_writing: |
||
1333 | call analyze_directory_to_write |
||
1334 | jc exit_writing_disk_full |
||
1335 | |||
1336 | mov [sector_tmp],eax |
||
1337 | mov [entry_pos],ebx |
||
1338 | push eax ; save directory sector |
||
1339 | mov eax,2 |
||
1340 | call get_free_FAT |
||
1341 | mov [cluster],eax ; first free cluster |
||
1342 | pop eax |
||
1343 | jc exit_writing_disk_full |
||
1344 | |||
1345 | mov esi,PUSHAD_EAX ; file name |
||
1346 | mov edi,ebx ; pointer in buffer |
||
1347 | mov ecx,11 |
||
1348 | cld |
||
1349 | rep movsb |
||
1350 | |||
1351 | mov esi,PUSHAD_EBX ; file size (bytes left) |
||
1352 | mov [ebx+28],esi ; file size |
||
1353 | mov ecx,[cluster] |
||
1354 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1355 | shr ecx,16 |
||
1356 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1357 | mov byte [ebx+11],0x20 ; attribute = archive |
||
1358 | |||
1359 | call set_current_time_for_entry |
||
1360 | |||
1361 | mov ebx,buffer ; save the directory name,length,cluster |
||
1362 | call hd_write |
||
1363 | |||
1364 | imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes |
||
1365 | xor ecx,ecx ; cluster count |
||
1366 | mov ebx,PUSHAD_ECX ; ebx = buffer |
||
1367 | |||
1368 | hd_new_block_write: |
||
1369 | |||
1370 | mov eax,[cluster] ; eax = block |
||
1371 | call set_data_cluster |
||
1372 | |||
1373 | sub esi,edi ; sub wrote bytes |
||
1374 | jbe file_saved_OK ; end if all done |
||
1375 | add ebx,edi ; update buffer position |
||
1376 | |||
1377 | inc eax |
||
1378 | call get_free_FAT ; next free in FAT |
||
1379 | jc exit_writing_disk_full_clear |
||
1380 | |||
1381 | mov edx,eax |
||
1382 | xchg eax,[cluster] ; get old cluster and save new cluster |
||
1383 | call set_FAT ; add it in cluster chain |
||
1384 | dec ecx ; update cluster count |
||
1385 | jmp hd_new_block_write |
||
1386 | |||
1387 | file_saved_OK: |
||
1388 | |||
1389 | mov edx,[fatEND] ; new end for cluster chain |
||
1390 | call set_FAT |
||
1391 | dec ecx ; update cluster count |
||
1392 | |||
1393 | call add_disk_free_space ; remove clusters from free disk space |
||
1394 | |||
1395 | popad |
||
1396 | call update_disk ; write all of cache and fat to hd |
||
1397 | mov [hd1_status],0 |
||
1398 | xor eax,eax |
||
1399 | ret |
||
1400 | |||
1401 | |||
1402 | file_read: |
||
1403 | ;-------------------------------------------------------------------------- |
||
1404 | ; INPUT : user-register register-in-this meaning symbol-in-this |
||
1405 | ; |
||
1406 | ; EAX EDI system call to write / |
||
1407 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1408 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1409 | ; ECX EBX (PAR2) vt file blocks to read PAR2 |
||
1410 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1411 | ; EDI ESI vt first 512 block to read |
||
1412 | ; EDI if 0 - read root |
||
1413 | ; |
||
1414 | ; output : eax = 0 - ok |
||
1415 | ; 3 - unknown FS |
||
1416 | ; 5 - file not found |
||
1417 | ; 6 - end of file |
||
1418 | ; 9 - fat table corrupted |
||
1419 | ; ebx = size of file/directory |
||
1420 | ;-------------------------------------------------------------------------- |
||
1421 | cmp [fat_type],0 |
||
1422 | jnz fat_ok_for_reading |
||
1423 | xor ebx,ebx |
||
1424 | mov eax,ERROR_UNKNOWN_FS |
||
63 | halyavin | 1425 | mov [hd1_status], ebx |
1 | ha | 1426 | ret |
1427 | |||
1428 | fat_ok_for_reading: |
||
1429 | ; call reserve_hd1 |
||
1430 | |||
1431 | pushad |
||
1432 | |||
1433 | mov ebx,edx |
||
1434 | call get_cluster_of_a_path |
||
1435 | jc file_to_read_not_found |
||
1436 | |||
1437 | test edi,edi ; read rootdir |
||
1438 | jne no_read_root |
||
1439 | |||
1440 | xor eax,eax |
||
1441 | call get_dir_size ; return rootdir size |
||
1442 | mov [file_size],eax |
||
1443 | mov eax,[ROOT_CLUSTER] |
||
1444 | jmp file_read_start |
||
1445 | |||
1446 | no_read_root: |
||
1447 | mov ebx,PUSHAD_EAX ; file name |
||
1448 | call analyze_directory |
||
1449 | jc file_to_read_not_found |
||
1450 | |||
1451 | mov eax,[ebx+28] ; file size |
||
1452 | test byte [ebx+11],0x10 ; is it directory? |
||
1453 | jz read_set_size ; no |
||
1454 | |||
1455 | mov eax,[ebx+20-2] ; FAT entry |
||
1456 | mov ax,[ebx+26] |
||
1457 | and eax,[fatMASK] |
||
1458 | call get_dir_size |
||
1459 | |||
1460 | read_set_size: |
||
1461 | mov [file_size],eax |
||
1462 | |||
1463 | mov eax,[ebx+20-2] ; FAT entry |
||
1464 | mov ax,[ebx+26] |
||
1465 | and eax,[fatMASK] |
||
1466 | |||
1467 | file_read_start: |
||
1468 | mov ebx,PUSHAD_ECX ; pointer to buffer |
||
1469 | mov edx,PUSHAD_EBX ; file blocks to read |
||
1470 | mov esi,PUSHAD_ESI ; first 512 block to read |
||
1471 | |||
1472 | file_read_new_cluster: |
||
1473 | call get_data_cluster |
||
1474 | jc file_read_eof ; end of file or cluster out of range |
||
1475 | |||
1476 | test edx,edx ; is all read? |
||
1477 | je file_read_OK ; yes |
||
1478 | |||
1479 | call get_FAT ; get next cluster |
||
1480 | cmp eax,[fatRESERVED] ; end of file |
||
1481 | jnb file_read_eof |
||
1482 | cmp eax,2 ; incorrect fat chain |
||
1483 | jnb file_read_new_cluster |
||
1484 | |||
1485 | popad |
||
1486 | mov [hd1_status],0 |
||
1487 | mov ebx,[file_size] |
||
1488 | mov eax,ERROR_FAT_TABLE |
||
1489 | ret |
||
1490 | |||
1491 | file_read_eof: |
||
1492 | popad |
||
1493 | mov [hd1_status],0 |
||
1494 | mov ebx,[file_size] |
||
1495 | mov eax,ERROR_END_OF_FILE |
||
1496 | ret |
||
1497 | |||
1498 | file_read_OK: |
||
1499 | popad |
||
1500 | mov [hd1_status],0 |
||
1501 | mov ebx,[file_size] |
||
1502 | xor eax,eax |
||
1503 | ret |
||
1504 | |||
1505 | file_to_read_not_found: |
||
1506 | popad |
||
1507 | mov [hd1_status],0 |
||
1508 | xor ebx,ebx |
||
1509 | mov eax,ERROR_FILE_NOT_FOUND |
||
1510 | ret |
||
1511 | |||
1512 | |||
1513 | get_dir_size: |
||
1514 | ;----------------------------------------------------- |
||
1515 | ; input : eax = first cluster (0=rootdir) |
||
1516 | ; output : eax = directory size in bytes |
||
1517 | ;----------------------------------------------------- |
||
1518 | push edx |
||
1519 | xor edx,edx ; count of directory clusters |
||
1520 | test eax,eax |
||
1521 | jnz dir_size_next |
||
1522 | |||
1523 | mov eax,[ROOT_SECTORS] |
||
1524 | shl eax,9 ; fat16 rootdir size in bytes |
||
1525 | cmp [fat_type],16 |
||
1526 | je dir_size_ret |
||
1527 | mov eax,[ROOT_CLUSTER] |
||
1528 | |||
1529 | dir_size_next: |
||
1530 | cmp eax,2 ; incorrect fat chain |
||
1531 | jb dir_size_end |
||
1532 | cmp eax,[fatRESERVED] ; end of directory |
||
1533 | ja dir_size_end |
||
1534 | call get_FAT ; get next cluster |
||
1535 | inc edx |
||
1536 | jmp dir_size_next |
||
1537 | |||
1538 | dir_size_end: |
||
1539 | imul eax,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
1540 | imul eax,edx |
||
1541 | |||
1542 | dir_size_ret: |
||
1543 | pop edx |
||
1544 | ret |
||
1545 | |||
1546 | |||
1547 | file_delete: |
||
1548 | ;----------------------------------------------------- |
||
1549 | ; input : eax = file/directory name |
||
1550 | ; edx = path |
||
1551 | ; edi = 1 - allow directory remove else don't remove directory |
||
1552 | ; output : eax = 0 - ok |
||
1553 | ; 3 - unknown FS |
||
1554 | ; 5 - file not found |
||
1555 | ; 10 - access denied |
||
1556 | ;----------------------------------------------------- |
||
1557 | cmp [fat_type],0 |
||
1558 | jnz file_del_fat_ok |
||
1559 | mov eax,ERROR_UNKNOWN_FS |
||
1560 | ret |
||
1561 | |||
1562 | file_del_fat_ok: |
||
1563 | pushad |
||
1564 | |||
1565 | mov ebx,edx |
||
1566 | call get_cluster_of_a_path |
||
1567 | jc file_to_delete_not_found |
||
1568 | |||
1569 | mov ebx,PUSHAD_EAX ; file/directory name |
||
1570 | call analyze_directory |
||
1571 | jc file_to_delete_not_found |
||
1572 | |||
1573 | test byte [ebx+11],0x10 ; is it directory? |
||
1574 | jz delete_notdir ; no. it's file |
||
1575 | cmp edi,1 ; allow directory remove |
||
1576 | jnz delete_no_access ; no |
||
1577 | |||
1578 | push eax ; save directory sector |
||
1579 | mov eax,[ebx+20-2] ; first cluster of file |
||
1580 | mov ax,[ebx+26] ; 0 length files start cluster = 0 |
||
1581 | and eax,[fatMASK] |
||
1582 | xor ebp,ebp ; counter for directory deepnes |
||
1583 | call clear_directory |
||
1584 | pop eax |
||
1585 | jc delete_no_access |
||
1586 | |||
1587 | push ebx ; save directory pointer in buffer |
||
1588 | mov ebx,buffer |
||
1589 | call hd_read ; read directory sector |
||
1590 | pop ebx |
||
1591 | |||
1592 | delete_notdir: |
||
1593 | call delete_entry_name |
||
1594 | mov eax,ecx ; first cluster of file |
||
1595 | call clear_cluster_chain |
||
1596 | popad |
||
1597 | xor eax,eax |
||
1598 | ret |
||
1599 | |||
1600 | delete_no_access: |
||
1601 | popad |
||
1602 | mov eax,ERROR_ACCESS_DENIED |
||
1603 | ret |
||
1604 | |||
1605 | file_to_delete_not_found: |
||
1606 | popad |
||
1607 | mov eax,ERROR_FILE_NOT_FOUND |
||
1608 | ret |
||
1609 | |||
1610 | |||
1611 | clear_cluster_chain: |
||
1612 | ;----------------------------------------------------- |
||
1613 | ; input : eax = first cluster |
||
1614 | ;----------------------------------------------------- |
||
1615 | push eax ecx edx |
||
1616 | xor ecx,ecx ; cluster count |
||
1617 | mov [f_del],1 ; delete on |
||
1618 | |||
1619 | clean_new_chain: |
||
1620 | cmp eax,[LAST_CLUSTER] ; end of file |
||
1621 | ja delete_OK |
||
1622 | cmp eax,2 ; unfinished fat chain or zero length file |
||
1623 | jb delete_OK |
||
1624 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1625 | jz delete_OK |
||
1626 | |||
1627 | xor edx,edx |
||
1628 | call set_FAT ; clear fat entry |
||
1629 | inc ecx ; update cluster count |
||
1630 | mov eax,edx ; old cluster |
||
1631 | jmp clean_new_chain |
||
1632 | |||
1633 | delete_OK: |
||
1634 | call add_disk_free_space ; add clusters to free disk space |
||
1635 | mov [f_del],0 |
||
1636 | pop edx ecx eax |
||
1637 | ret |
||
1638 | |||
1639 | |||
1640 | clear_directory: |
||
1641 | ;----------------------------------------------------- |
||
1642 | ; input : eax = directory cluster |
||
1643 | ; ebp = directory deepnes |
||
1644 | ; Note : use recursive call |
||
1645 | ;----------------------------------------------------- |
||
1646 | pushad |
||
1647 | inc ebp |
||
1648 | cmp ebp,64 ; if over 63 directory deep |
||
1649 | jnb clear_error ; something must be wrong |
||
1650 | |||
1651 | clear_new_cluster: |
||
1652 | cmp eax,[LAST_CLUSTER] |
||
1653 | ja clear_end |
||
1654 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1655 | jz clear_end |
||
1656 | mov esi,eax ; esi = current directory cluster |
||
1657 | sub eax,2 |
||
1658 | jb clear_end |
||
1659 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1660 | imul eax,ecx |
||
1661 | add eax,[DATA_START] |
||
1662 | |||
1663 | clear_new_sector: |
||
1664 | mov edi,eax ; edi = current directory sector |
||
1665 | mov ebx,deltree_buffer |
||
1666 | call hd_read |
||
1667 | mov edx,512/32 ; count of dir entrys per sector = 16 |
||
1668 | |||
1669 | clear_analyze: |
||
1670 | mov al,[ebx+11] ; file attribute |
||
1671 | and al,0xf |
||
1672 | cmp al,0xf |
||
1673 | je clear_long_filename |
||
1674 | |||
1675 | cmp byte [ebx],'.' ; parent or current directory |
||
1676 | je clear_next_entry |
||
1677 | cmp byte [ebx],0xe5 ; deleted |
||
1678 | je clear_next_entry |
||
1679 | cmp byte [ebx],0 ; empty |
||
1680 | je clear_write_last |
||
1681 | ;je clear_next_entry |
||
1682 | |||
1683 | mov eax,[ebx+20-2] ; first cluster of entry |
||
1684 | mov ax,[ebx+26] |
||
1685 | and eax,[fatMASK] |
||
1686 | |||
1687 | test byte [ebx+11],0x10 ; is it directory? |
||
1688 | jz clear_file ; no |
||
1689 | |||
1690 | push eax ebx |
||
1691 | mov eax,edi |
||
1692 | mov ebx,deltree_buffer ; save buffer over recursive call |
||
1693 | call hd_write ; write directory sector to disk |
||
1694 | pop ebx eax |
||
1695 | |||
1696 | call clear_directory ; recursive call !!! |
||
1697 | jc clear_error ; exit if error found |
||
1698 | |||
1699 | push eax ebx |
||
1700 | mov eax,edi |
||
1701 | mov ebx,deltree_buffer |
||
1702 | call hd_read ; read directory sector again |
||
1703 | pop ebx eax |
||
1704 | |||
1705 | clear_file: |
||
1706 | call clear_cluster_chain |
||
1707 | |||
1708 | clear_long_filename: |
||
1709 | mov byte [ebx],0xe5 |
||
1710 | |||
1711 | clear_next_entry: |
||
1712 | add ebx,32 ; position of next dir entry |
||
1713 | dec edx |
||
1714 | jnz clear_analyze |
||
1715 | |||
1716 | mov eax,edi |
||
1717 | mov ebx,deltree_buffer |
||
1718 | call hd_write ; write directory sector to disk |
||
1719 | |||
1720 | inc eax ; next sector |
||
1721 | dec ecx |
||
1722 | jnz clear_new_sector |
||
1723 | |||
1724 | mov eax,esi |
||
1725 | call get_FAT ; get next cluster |
||
1726 | jmp clear_new_cluster ; clear it |
||
1727 | |||
1728 | clear_write_last: |
||
1729 | mov eax,edi |
||
1730 | mov ebx,deltree_buffer |
||
1731 | call hd_write ; write directory sector to disk |
||
1732 | |||
1733 | clear_end: |
||
1734 | popad |
||
1735 | clc |
||
1736 | ret |
||
1737 | |||
1738 | clear_error: |
||
1739 | popad |
||
1740 | stc |
||
1741 | ret |
||
1742 | |||
1743 | |||
1744 | delete_entry_name: |
||
1745 | ;----------------------------------------------------- |
||
1746 | ; input : eax = directory sector |
||
1747 | ; ebx = directory pointer in buffer |
||
1748 | ; longname_sec = 2 previous directory sectors |
||
1749 | ; output : ecx = first cluster |
||
1750 | ; change : eax,ebx,edx |
||
1751 | ;----------------------------------------------------- |
||
1752 | mov byte [ebx],0xe5 |
||
1753 | mov ecx,[ebx+20-2] ; first cluster of file |
||
1754 | mov cx,[ebx+26] ; 0 length files start cluster = 0 |
||
1755 | and ecx,[fatMASK] |
||
1756 | |||
1757 | delete_empty: |
||
1758 | sub ebx,32 |
||
1759 | cmp ebx,buffer |
||
1760 | jnb delete_test_long |
||
1761 | |||
1762 | mov ebx,buffer |
||
1763 | call hd_write ; write directory sector back |
||
1764 | xor eax,eax |
||
1765 | xchg eax,[longname_sec2] |
||
1766 | xchg eax,[longname_sec1] |
||
1767 | test eax,eax ; is there previous directory sector? |
||
1768 | jz delete_name_end ; no |
||
1769 | |||
1770 | mov ebx,buffer |
||
1771 | call hd_read ; read previous sector |
||
1772 | mov ebx,buffer+0x1e0 ; start from last entry |
||
1773 | |||
1774 | delete_test_long: |
||
1775 | mov dh,[ebx+11] ; file attribute |
||
1776 | and dh,0xf |
||
1777 | cmp dh,0xf |
||
1778 | jne delete_write_buffer |
||
1779 | |||
1780 | cmp byte [ebx],0x40 ; end of long dir entry? |
||
1781 | mov byte [ebx],0xe5 |
||
1782 | jb delete_empty |
||
1783 | |||
1784 | delete_write_buffer: |
||
1785 | mov ebx,buffer |
||
1786 | call hd_write ; write directory sector back |
||
1787 | |||
1788 | delete_name_end: |
||
1789 | ret |
||
1790 | |||
1791 | |||
1792 | rename: |
||
1793 | ;----------------------------------------------------------- |
||
1794 | ; input : eax = source directory name |
||
1795 | ; edx = source path |
||
1796 | ; ebx = dest directory name |
||
1797 | ; edi = dest path |
||
1798 | ; output : eax = 0 - ok |
||
1799 | ; 3 - unknown FS |
||
1800 | ; 5 - file not found |
||
1801 | ; 8 - disk full |
||
1802 | ; 10 - access denied |
||
1803 | ;----------------------------------------------------------- |
||
1804 | cmp [fat_type],0 |
||
1805 | jnz fat_ok_for_rename |
||
1806 | mov eax,ERROR_UNKNOWN_FS |
||
1807 | ret |
||
1808 | |||
1809 | fat_ok_for_rename: |
||
1810 | ; call reserve_hd1 |
||
1811 | |||
1812 | pushad |
||
1813 | |||
1814 | mov ebx,edx ; source path |
||
1815 | call get_cluster_of_a_path |
||
1816 | jc rename_entry_not_found |
||
1817 | |||
1818 | mov ebx,PUSHAD_EAX ; source directory name |
||
1819 | call analyze_directory |
||
1820 | jc rename_entry_not_found |
||
1821 | |||
1822 | mov [sector_tmp],eax ; save source sector |
||
1823 | mov [entry_pos],ebx |
||
1824 | mov esi,ebx |
||
1825 | mov edi,dir_entry |
||
1826 | mov ecx,32/4 |
||
1827 | cld |
||
1828 | rep movsd ; save entry |
||
1829 | |||
1830 | mov ebx,PUSHAD_EDI ; dest path |
||
1831 | call get_cluster_of_a_path |
||
1832 | jc rename_entry_not_found |
||
1833 | |||
1834 | mov edx,eax ; save dest directory cluster |
||
1835 | mov ebx,PUSHAD_EBX ; dest directory name |
||
1836 | push [longname_sec1] |
||
1837 | push [longname_sec2] |
||
1838 | call analyze_directory ; check if entry already exist |
||
1839 | pop [longname_sec2] |
||
1840 | pop [longname_sec1] |
||
1841 | jnc rename_entry_already_exist |
||
1842 | |||
1843 | mov eax,edx |
||
1844 | call analyze_directory_to_write |
||
1845 | jc rename_disk_full |
||
1846 | |||
1847 | mov esi,dir_entry |
||
1848 | mov edi,ebx |
||
1849 | mov ecx,32/4 |
||
1850 | cld |
||
1851 | rep movsd ; copy entry |
||
1852 | mov esi,PUSHAD_EBX ; dest directory name |
||
1853 | mov edi,ebx |
||
1854 | mov ecx,11 |
||
1855 | rep movsb ; copy name |
||
1856 | |||
1857 | mov ebx,buffer ; save the directory name,length,cluster |
||
1858 | call hd_write |
||
1859 | |||
1860 | test byte [dir_entry+11],0x10 ; is it directory? |
||
1861 | jz rename_not_dir ; no |
||
1862 | mov eax,[dir_entry+20-2] ; FAT entry |
||
1863 | mov ax,[dir_entry+26] |
||
1864 | and eax,[fatMASK] |
||
1865 | call change_2dot_cluster |
||
1866 | |||
1867 | rename_not_dir: |
||
1868 | mov eax,[sector_tmp] |
||
1869 | mov ebx,buffer |
||
1870 | call hd_read ; read source directory sector |
||
1871 | |||
1872 | mov ebx,[entry_pos] |
||
1873 | call delete_entry_name |
||
1874 | |||
1875 | popad |
||
1876 | call update_disk ; write all of cache and fat to hd |
||
1877 | mov [hd1_status],0 |
||
1878 | xor eax,eax |
||
1879 | ret |
||
1880 | |||
1881 | rename_entry_not_found: |
||
1882 | popad |
||
1883 | mov [hd1_status],0 |
||
1884 | mov eax,ERROR_FILE_NOT_FOUND |
||
1885 | ret |
||
1886 | |||
1887 | rename_entry_already_exist: |
||
1888 | popad |
||
1889 | mov [hd1_status],0 |
||
1890 | mov eax,ERROR_ACCESS_DENIED |
||
1891 | ret |
||
1892 | |||
1893 | rename_disk_full: |
||
1894 | popad |
||
1895 | mov [hd1_status],0 |
||
1896 | mov eax,ERROR_DISK_FULL |
||
1897 | ret |
||
1898 | |||
1899 | |||
1900 | change_2dot_cluster: |
||
1901 | ;----------------------------------------------------------- |
||
1902 | ; input : eax = directory cluster |
||
1903 | ; edx = value to save |
||
1904 | ; change : eax,ebx,edx |
||
1905 | ;----------------------------------------------------------- |
||
1906 | cmp eax,[LAST_CLUSTER] |
||
1907 | ja not_2dot ; too big cluster number, something is wrong |
||
1908 | sub eax,2 |
||
1909 | jb not_2dot |
||
1910 | |||
1911 | imul eax,[SECTORS_PER_CLUSTER] |
||
1912 | add eax,[DATA_START] |
||
1913 | mov ebx,buffer |
||
1914 | call hd_read |
||
1915 | |||
1916 | cmp dword [ebx+32],'.. ' |
||
1917 | jnz not_2dot |
||
1918 | |||
1919 | cmp edx,[ROOT_CLUSTER] ; is rootdir cluster? |
||
1920 | jne not_2dot_root |
||
1921 | xor edx,edx ; yes. set it zero |
||
1922 | |||
1923 | not_2dot_root: |
||
1924 | mov [ebx+32+26],dx ; 16 bits low of cluster |
||
1925 | shr edx,16 |
||
1926 | mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16) |
||
1927 | call hd_write |
||
1928 | |||
1929 | not_2dot: |
||
1930 | ret |
||
1931 | |||
1932 | |||
1933 | get_filesize: |
||
1934 | ;----------------------------------------------------------- |
||
1935 | ; input : eax = file name |
||
1936 | ; edx = path |
||
1937 | ; edi = if 0 - read rootdir else normal dir/file size |
||
1938 | ; output : eax = 0 - ok |
||
1939 | ; 3 - unknown FS |
||
1940 | ; 5 - file not found |
||
1941 | ; ebx = file size |
||
1942 | ;----------------------------------------------------------- |
||
1943 | cmp [fat_type],0 |
||
1944 | jnz get_filesize_fat_ok |
||
1945 | xor ebx,ebx |
||
1946 | mov eax,ERROR_UNKNOWN_FS |
||
1947 | ret |
||
1948 | |||
1949 | get_filesize_fat_ok: |
||
1950 | ; call reserve_hd1 |
||
1951 | |||
1952 | pushad |
||
1953 | xor eax,eax |
||
1954 | test edi,edi ; is read rootdir? |
||
1955 | je get_filesize_dirsize ; yes |
||
1956 | |||
1957 | get_filesize_no_root: |
||
1958 | mov ebx,edx |
||
1959 | call get_cluster_of_a_path |
||
1960 | jc get_filesize_not_found |
||
1961 | |||
1962 | mov ebx,PUSHAD_EAX ; file name |
||
1963 | call analyze_directory |
||
1964 | jc get_filesize_not_found |
||
1965 | |||
1966 | mov eax,[ebx+28] ; file size |
||
1967 | test byte [ebx+11],0x10 ; is it directory? |
||
1968 | jz get_filesize_set_size ; no |
||
1969 | |||
1970 | mov eax,[ebx+20-2] ; FAT entry |
||
1971 | mov ax,[ebx+26] |
||
1972 | and eax,[fatMASK] |
||
1973 | |||
1974 | get_filesize_dirsize: |
||
1975 | call get_dir_size |
||
1976 | |||
1977 | get_filesize_set_size: |
||
1978 | mov PUSHAD_EBX,eax |
||
1979 | popad |
||
1980 | mov [hd1_status],0 |
||
1981 | xor eax,eax |
||
1982 | ret |
||
1983 | |||
1984 | get_filesize_not_found: |
||
1985 | popad |
||
1986 | mov [hd1_status],0 |
||
1987 | xor ebx,ebx |
||
1988 | mov eax,ERROR_FILE_NOT_FOUND |
||
1989 | ret |
||
1990 | |||
1991 | |||
1992 | get_fileattr: |
||
1993 | ;----------------------------------------------------------- |
||
1994 | ; input : eax = file name |
||
1995 | ; edx = path |
||
1996 | ; output : eax = 0 - ok |
||
1997 | ; 3 - unknown FS |
||
1998 | ; 5 - file not found |
||
1999 | ; ebx = file attribute |
||
2000 | ;----------------------------------------------------------- |
||
2001 | cmp [fat_type],0 |
||
2002 | jnz get_fileattr_fat_ok |
||
2003 | xor ebx,ebx |
||
2004 | mov eax,ERROR_UNKNOWN_FS |
||
2005 | ret |
||
2006 | |||
2007 | get_fileattr_fat_ok: |
||
2008 | ; call reserve_hd1 |
||
2009 | |||
2010 | pushad |
||
2011 | mov ebx,edx |
||
2012 | call get_cluster_of_a_path |
||
2013 | jc get_fileattr_not_found |
||
2014 | |||
2015 | mov ebx,PUSHAD_EAX ; file name |
||
2016 | call analyze_directory |
||
2017 | jc get_fileattr_not_found |
||
2018 | |||
2019 | movzx eax,byte [ebx+11] ; file attribute |
||
2020 | mov PUSHAD_EBX,eax |
||
2021 | popad |
||
2022 | mov [hd1_status],0 |
||
2023 | xor eax,eax |
||
2024 | ret |
||
2025 | |||
2026 | get_fileattr_not_found: |
||
2027 | popad |
||
2028 | mov [hd1_status],0 |
||
2029 | xor ebx,ebx |
||
2030 | mov eax,ERROR_FILE_NOT_FOUND |
||
2031 | ret |
||
2032 | |||
2033 | |||
2034 | get_filedate: |
||
2035 | ;----------------------------------------------------------- |
||
2036 | ; input : eax = file name |
||
2037 | ; edx = path |
||
2038 | ; output : eax = 0 - ok |
||
2039 | ; 3 - unknown FS |
||
2040 | ; 5 - file not found |
||
2041 | ; ebx = file date/time |
||
2042 | ; bits 31..25 = year-1980 |
||
2043 | ; bits 24..21 = month |
||
2044 | ; bits 20..16 = day |
||
2045 | ; bits 15..11 = hour |
||
2046 | ; bits 10..5 = minute |
||
2047 | ; bits 4..0 = second/2 |
||
2048 | ;----------------------------------------------------------- |
||
2049 | cmp [fat_type],0 |
||
2050 | jnz get_filedate_fat_ok |
||
2051 | xor ebx,ebx |
||
2052 | mov eax,ERROR_UNKNOWN_FS |
||
2053 | ret |
||
2054 | |||
2055 | get_filedate_fat_ok: |
||
2056 | ; call reserve_hd1 |
||
2057 | |||
2058 | pushad |
||
2059 | mov ebx,edx |
||
2060 | call get_cluster_of_a_path |
||
2061 | jc get_filedate_not_found |
||
2062 | |||
2063 | mov ebx,PUSHAD_EAX ; file name |
||
2064 | call analyze_directory |
||
2065 | jc get_filedate_not_found |
||
2066 | |||
2067 | mov eax,[ebx+22] ; file date/time |
||
2068 | mov PUSHAD_EBX,eax |
||
2069 | popad |
||
2070 | mov [hd1_status],0 |
||
2071 | xor eax,eax |
||
2072 | ret |
||
2073 | |||
2074 | get_filedate_not_found: |
||
2075 | popad |
||
2076 | mov [hd1_status],0 |
||
2077 | xor ebx,ebx |
||
2078 | mov eax,ERROR_FILE_NOT_FOUND |
||
2079 | ret |
||
2080 | |||
2081 | |||
2082 | get_hd_info: |
||
2083 | ;----------------------------------------------------------- |
||
2084 | ; output : eax = 0 - ok |
||
2085 | ; 3 - unknown FS |
||
2086 | ; edx = cluster size in bytes |
||
2087 | ; ebx = total clusters on disk |
||
2088 | ; ecx = free clusters on disk |
||
2089 | ;----------------------------------------------------------- |
||
2090 | cmp [fat_type],0 |
||
2091 | jnz info_fat_ok |
||
2092 | xor edx,edx |
||
2093 | xor ebx,ebx |
||
2094 | xor ecx,ecx |
||
2095 | mov eax,ERROR_UNKNOWN_FS |
||
2096 | ret |
||
2097 | |||
2098 | info_fat_ok: |
||
2099 | ; call reserve_hd1 |
||
2100 | |||
2101 | xor ecx,ecx ; count of free clusters |
||
2102 | mov eax,2 |
||
2103 | mov ebx,[LAST_CLUSTER] |
||
2104 | |||
2105 | info_cluster: |
||
2106 | push eax |
||
2107 | call get_FAT ; get cluster info |
||
2108 | test eax,eax ; is it free? |
||
2109 | jnz info_used ; no |
||
2110 | inc ecx |
||
2111 | |||
2112 | info_used: |
||
2113 | pop eax |
||
2114 | inc eax |
||
2115 | cmp eax,ebx ; is above last cluster? |
||
2116 | jbe info_cluster ; no. test next cluster |
||
2117 | |||
2118 | dec ebx ; cluster count |
||
2119 | imul edx,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
2120 | mov [hd1_status],0 |
||
2121 | xor eax,eax |
||
2122 | ret |
||
2123 | |||
2124 | |||
2125 | update_disk: |
||
2126 | ;----------------------------------------------------------- |
||
2127 | ; write changed fat and cache to disk |
||
2128 | ;----------------------------------------------------------- |
||
2129 | cmp [fat_change],0 ; is fat changed? |
||
2130 | je upd_no_change |
||
2131 | |||
2132 | call write_fat_sector |
||
2133 | |||
2134 | upd_no_change: |
||
2135 | |||
2136 | call write_cache |
||
2137 | ret |
||
2138 | |||
2139 | |||
2140 | ;************************************************************************** |
||
2141 | ; |
||
2142 | ; 0x600008 - first entry in cache list |
||
2143 | ; |
||
2144 | ; +0 - lba sector |
||
2145 | ; +4 - state of cache sector |
||
2146 | ; 0 = empty |
||
2147 | ; 1 = used for read ( same as in hd ) |
||
2148 | ; 2 = used for write ( differs from hd ) |
||
2149 | ; |
||
2150 | ; +65536 - cache entries |
||
2151 | ; |
||
2152 | ;************************************************************************** |
||
2153 | |||
2154 | |||
2155 | hd_read: |
||
2156 | ;----------------------------------------------------------- |
||
2157 | ; input : eax = block to read |
||
2158 | ; ebx = destination |
||
2159 | ;----------------------------------------------------------- |
||
2160 | push ecx esi edi ; scan cache |
||
2161 | |||
2162 | mov ecx,cache_max ; entries in cache |
||
2163 | mov esi,0x600000+8 |
||
2164 | mov edi,1 |
||
2165 | |||
2166 | hdreadcache: |
||
2167 | |||
2168 | cmp dword [esi+4],0 ; empty |
||
2169 | je nohdcache |
||
2170 | |||
2171 | cmp [esi],eax ; correct sector |
||
2172 | je yeshdcache |
||
2173 | |||
2174 | nohdcache: |
||
2175 | |||
2176 | add esi,8 |
||
2177 | inc edi |
||
2178 | dec ecx |
||
2179 | jnz hdreadcache |
||
2180 | |||
2181 | call find_empty_slot ; ret in edi |
||
2182 | |||
2183 | call wait_for_hd_idle |
||
2184 | push eax edx |
||
2185 | |||
2186 | cli |
||
2187 | xor eax,eax |
||
2188 | mov edx,[hdbase] |
||
2189 | inc edx |
||
2190 | out dx,al ; ATAFeatures ðåãèñòð "îñîáåííîñòåé" |
||
2191 | inc edx |
||
2192 | inc eax |
||
2193 | out dx,al ; ATASectorCount ñ÷åò÷èê ñåêòîðîâ |
||
2194 | inc edx |
||
2195 | mov eax,[esp+4] |
||
2196 | out dx,al ; ATASectorNumber ðåãèñòð íîìåðà ñåêòîðà |
||
2197 | shr eax,8 |
||
2198 | inc edx |
||
2199 | out dx,al ; ATACylinder íîìåð öèëèíäðà (ìëàäøèé áàéò) |
||
2200 | shr eax,8 |
||
2201 | inc edx |
||
2202 | out dx,al ; íîìåð öèëèíäðà (ñòàðøèé áàéò) |
||
2203 | shr eax,8 |
||
2204 | inc edx |
||
2205 | and al,1+2+4+8 |
||
2206 | add al,byte [hdid] |
||
2207 | add al,128+64+32 |
||
2208 | out dx,al ; íîìåð ãîëîâêè/íîìåð äèñêà |
||
2209 | inc edx |
||
2210 | mov al,20h |
||
2211 | out dx,al ; ATACommand ðåãèñòð êîìàíä |
||
2212 | sti |
||
2213 | |||
2214 | call wait_for_sector_buffer |
||
2215 | |||
2216 | cmp [hd_error],0 |
||
2217 | jne hd_read_error |
||
2218 | |||
2219 | cli |
||
2220 | push edi |
||
2221 | shl edi,9 |
||
2222 | add edi,0x600000+65536 |
||
2223 | mov ecx,256 |
||
2224 | mov edx,[hdbase] |
||
2225 | cld |
||
2226 | rep insw |
||
2227 | pop edi |
||
2228 | sti |
||
2229 | |||
2230 | pop edx eax |
||
2231 | blok_read_2: |
||
2232 | lea esi,[edi*8+0x600000] |
||
2233 | mov [esi],eax ; sector number |
||
2234 | mov dword [esi+4],1 ; hd read - mark as same as in hd |
||
2235 | |||
2236 | yeshdcache: |
||
2237 | |||
2238 | mov esi,edi |
||
2239 | shl esi,9 |
||
2240 | add esi,0x600000+65536 |
||
2241 | mov edi,ebx |
||
2242 | mov ecx,512/4 |
||
2243 | cld |
||
2244 | rep movsd ; move data |
||
2245 | ; blok_read_2: |
||
2246 | pop edi esi ecx |
||
2247 | ret |
||
2248 | |||
2249 | |||
2250 | hd_write: |
||
2251 | ;----------------------------------------------------------- |
||
2252 | ; input : eax = block |
||
2253 | ; ebx = pointer to memory |
||
2254 | ;----------------------------------------------------------- |
||
2255 | push ecx esi edi |
||
2256 | |||
2257 | ; check if the cache already has the sector and overwrite it |
||
2258 | |||
2259 | mov ecx,cache_max |
||
2260 | mov esi,0x600000+8 |
||
2261 | mov edi,1 |
||
2262 | |||
2263 | hdwritecache: |
||
2264 | |||
2265 | cmp dword [esi+4],0 ; if cache slot is empty |
||
2266 | je not_in_cache_write |
||
2267 | |||
2268 | cmp [esi],eax ; if the slot has the sector |
||
2269 | je yes_in_cache_write |
||
2270 | |||
2271 | not_in_cache_write: |
||
2272 | |||
2273 | add esi,8 |
||
2274 | inc edi |
||
2275 | dec ecx |
||
2276 | jnz hdwritecache |
||
2277 | |||
2278 | ; sector not found in cache |
||
2279 | ; write the block to a new location |
||
2280 | |||
2281 | call find_empty_slot ; ret in edi |
||
2282 | |||
2283 | lea esi,[edi*8+0x600000] |
||
2284 | mov [esi],eax ; sector number |
||
2285 | |||
2286 | yes_in_cache_write: |
||
2287 | |||
2288 | mov dword [esi+4],2 ; write - differs from hd |
||
2289 | |||
2290 | shl edi,9 |
||
2291 | add edi,0x600000+65536 |
||
2292 | mov esi,ebx |
||
2293 | mov ecx,512/4 |
||
2294 | cld |
||
2295 | rep movsd ; move data |
||
2296 | |||
2297 | pop edi esi ecx |
||
2298 | ret |
||
2299 | |||
2300 | |||
2301 | write_cache: |
||
2302 | ;----------------------------------------------------------- |
||
2303 | ; write all changed sectors to disk |
||
2304 | ;----------------------------------------------------------- |
||
2305 | push eax ecx edx esi edi |
||
2306 | |||
2307 | ; write difference ( 2 ) from cache to hd |
||
2308 | |||
2309 | mov ecx,cache_max |
||
2310 | mov esi,0x600000+8 |
||
2311 | mov edi,1 |
||
2312 | |||
2313 | write_cache_more: |
||
2314 | |||
2315 | cmp dword [esi+4],2 ; if cache slot is not different |
||
2316 | jne does_not_need_writing |
||
2317 | |||
2318 | mov dword [esi+4],1 ; same as in hd |
||
2319 | mov eax,[esi] ; eax = sector to write |
||
2320 | |||
2321 | cmp eax,[PARTITION_START] |
||
2322 | jb danger |
||
2323 | cmp eax,[PARTITION_END] |
||
2324 | ja danger |
||
2325 | |||
2326 | call wait_for_hd_idle |
||
2327 | |||
2328 | cli |
||
2329 | xor eax,eax |
||
2330 | mov edx,[hdbase] |
||
2331 | inc edx |
||
2332 | out dx,al |
||
2333 | inc edx |
||
2334 | inc eax |
||
2335 | out dx,al |
||
2336 | inc edx |
||
2337 | mov eax,[esi] ; eax = sector to write |
||
2338 | out dx,al |
||
2339 | shr eax,8 |
||
2340 | inc edx |
||
2341 | out dx,al |
||
2342 | shr eax,8 |
||
2343 | inc edx |
||
2344 | out dx,al |
||
2345 | shr eax,8 |
||
2346 | inc edx |
||
2347 | and al,1+2+4+8 |
||
2348 | add al,byte [hdid] |
||
2349 | add al,128+64+32 |
||
2350 | out dx,al |
||
2351 | inc edx |
||
2352 | mov al,30h |
||
2353 | out dx,al |
||
2354 | sti |
||
2355 | |||
2356 | call wait_for_sector_buffer |
||
2357 | |||
2358 | cmp [hd_error],0 |
||
2359 | jne hd_write_error |
||
2360 | |||
2361 | push ecx esi |
||
2362 | |||
2363 | cli |
||
2364 | mov esi,edi |
||
2365 | shl esi,9 |
||
2366 | add esi,0x600000+65536 ; esi = from memory position |
||
2367 | mov ecx,256 |
||
2368 | mov edx,[hdbase] |
||
2369 | cld |
||
2370 | rep outsw |
||
2371 | sti |
||
2372 | |||
2373 | pop esi ecx |
||
2374 | |||
2375 | danger: |
||
2376 | does_not_need_writing: |
||
2377 | |||
2378 | add esi,8 |
||
2379 | inc edi |
||
2380 | dec ecx |
||
2381 | jnz write_cache_more |
||
2382 | |||
2383 | pop edi esi edx ecx eax |
||
2384 | ret |
||
2385 | |||
2386 | |||
2387 | find_empty_slot: |
||
2388 | ;----------------------------------------------------------- |
||
2389 | ; find empty or read slot, flush cache if next 10% is used by write |
||
2390 | ; output : edi = cache slot |
||
2391 | ;----------------------------------------------------------- |
||
2392 | push ecx esi |
||
2393 | |||
2394 | search_again: |
||
2395 | |||
2396 | mov ecx,cache_max*10/100 |
||
2397 | mov edi,[cache_search_start] |
||
2398 | |||
2399 | search_for_empty: |
||
2400 | |||
2401 | inc edi |
||
2402 | cmp edi,cache_max |
||
2403 | jbe inside_cache |
||
2404 | mov edi,1 |
||
2405 | |||
2406 | inside_cache: |
||
2407 | |||
2408 | cmp dword [edi*8+0x600000+4],2 ; get cache slot info |
||
2409 | jb found_slot ; it's empty or read |
||
2410 | dec ecx |
||
2411 | jnz search_for_empty |
||
2412 | |||
2413 | call write_cache ; no empty slots found, write all |
||
2414 | jmp search_again ; and start again |
||
2415 | |||
2416 | found_slot: |
||
2417 | |||
2418 | mov [cache_search_start],edi |
||
2419 | |||
2420 | pop esi ecx |
||
2421 | ret |
||
2422 | |||
2423 | |||
2424 | save_hd_wait_timeout: |
||
2425 | |||
2426 | push eax |
||
2427 | mov eax,[timer_ticks];[0xfdf0] |
||
2428 | add eax,300 ; 3 sec timeout |
||
2429 | mov [hd_wait_timeout],eax |
||
2430 | pop eax |
||
2431 | ret |
||
2432 | |||
2433 | |||
2434 | check_hd_wait_timeout: |
||
2435 | |||
2436 | push eax |
||
2437 | mov eax,[hd_wait_timeout] |
||
2438 | cmp [timer_ticks], eax ;[0xfdf0],eax |
||
2439 | jg hd_timeout_error |
||
2440 | pop eax |
||
2441 | ret |
||
2442 | |||
2443 | iglobal |
||
2444 | hd_timeout_str db 'K : FS - HD timeout',13,10,0 |
||
2445 | hd_read_str db 'K : FS - HD read error',13,10,0 |
||
2446 | hd_write_str db 'K : FS - HD write error',13,10,0 |
||
2447 | endg |
||
2448 | |||
2449 | hd_timeout_error: |
||
2450 | |||
2451 | call clear_hd_cache |
||
2452 | call clear_application_table_status |
||
2453 | mov esi,hd_timeout_str |
||
2454 | call sys_msg_board_str |
||
2455 | jmp $ |
||
2456 | |||
2457 | |||
2458 | hd_read_error: |
||
2459 | |||
2460 | call clear_hd_cache |
||
2461 | call clear_application_table_status |
||
2462 | mov esi,hd_read_str |
||
2463 | call sys_msg_board_str |
||
2464 | jmp $ |
||
2465 | |||
2466 | hd_write_error: |
||
2467 | |||
2468 | call clear_hd_cache |
||
2469 | call clear_application_table_status |
||
2470 | mov esi,hd_write_str |
||
2471 | call sys_msg_board_str |
||
2472 | jmp $ |
||
2473 | |||
2474 | |||
2475 | |||
2476 | |||
2477 | wait_for_hd_idle: |
||
2478 | |||
2479 | push eax edx |
||
2480 | |||
2481 | call save_hd_wait_timeout |
||
2482 | |||
2483 | mov edx,[hdbase] |
||
2484 | add edx,0x7 |
||
2485 | |||
2486 | wfhil1: |
||
2487 | |||
2488 | call check_hd_wait_timeout |
||
2489 | |||
2490 | in al,dx |
||
2491 | test al,128 |
||
2492 | jnz wfhil1 |
||
2493 | |||
2494 | pop edx eax |
||
2495 | ret |
||
2496 | |||
2497 | |||
2498 | wait_for_sector_buffer: |
||
2499 | |||
2500 | push eax edx |
||
2501 | |||
2502 | mov edx,[hdbase] |
||
2503 | add edx,0x7 |
||
2504 | |||
2505 | call save_hd_wait_timeout |
||
2506 | |||
2507 | hdwait_sbuf: ; wait for sector buffer to be ready |
||
2508 | |||
2509 | call check_hd_wait_timeout |
||
2510 | |||
2511 | in al,dx |
||
2512 | test al,8 |
||
2513 | jz hdwait_sbuf |
||
2514 | |||
2515 | mov [hd_error],0 |
||
2516 | |||
2517 | cmp [hd_setup],1 ; do not mark error for setup request |
||
2518 | je buf_wait_ok |
||
2519 | |||
2520 | test al,1 ; previous command ended up with an error |
||
2521 | jz buf_wait_ok |
||
2522 | mov [hd_error],1 |
||
2523 | |||
2524 | buf_wait_ok: |
||
2525 | |||
2526 | pop edx eax |
||
2527 | ret |
||
2528 | |||
2529 | |||
2530 | |||
2531 | read_hd_file: |
||
2532 | ;----------------------------------------------------------------- |
||
2533 | ; |
||
2534 | ; Converting old reading function for hd-application start. |
||
2535 | ; |
||
2536 | ; IN: |
||
2537 | ; |
||
2538 | ; eax - pointer to file (0 = read only first sector of drive: eg 'label') |
||
2539 | ; ebx - file lenght |
||
2540 | ; ecx - start 512 byte block number |
||
2541 | ; edx - number of blocks to read |
||
2542 | ; esi - pointer to return/work area (atleast 20 000 bytes) |
||
2543 | ; |
||
2544 | ; For new read function |
||
2545 | ; |
||
2546 | ; EAX (PAR0) pointer to file-name |
||
2547 | ; ECX (PAR1) pointer to buffer |
||
2548 | ; EBX (PAR2) vt file blocks to read |
||
2549 | ; EDX (PAR3) pointer to path |
||
2550 | ; ESI vt first 512 block to read |
||
2551 | ; EDI if 0 - return root |
||
2552 | ;-------------------------------------------------------------------------- |
||
2553 | |||
2554 | push ecx esi edi |
||
2555 | mov esi,eax |
||
2556 | mov edi,startpath |
||
2557 | mov ecx,250 |
||
2558 | cld |
||
2559 | rep movsb |
||
2560 | pop edi esi ecx |
||
2561 | |||
2562 | mov eax,startpath |
||
2563 | mov [eax+ebx-12],byte 0 |
||
2564 | |||
2565 | push eax ebx ecx edx esi |
||
2566 | |||
2567 | pop ecx ; pointer to buffer |
||
2568 | add ecx,1024 |
||
2569 | pop ebx ; number of blocks to read |
||
2570 | pop esi ; first block to read |
||
2571 | dec esi |
||
2572 | pop eax ; file length |
||
2573 | pop edx ; pointer to path |
||
2574 | |||
2575 | mov edi,12 |
||
2576 | lea eax,[eax+edx-12+1] |
||
2577 | call file_read |
||
2578 | |||
2579 | ret |
||
2580 | |||
71 | diamond | 2581 | ; \begin{diamond} |
2582 | hd_find_lfn: |
||
2583 | ; in: esi->name |
||
2584 | ; out: CF=1 - file not found |
||
2585 | ; else CF=0 and edi->direntry |
||
2586 | pusha |
||
2587 | sub esp, 262*2 ; allocate space for LFN |
||
2588 | mov ebp, esp |
||
2589 | mov eax, [ROOT_CLUSTER] ; start from root |
||
2590 | .mainloop: |
||
2591 | .new_cluster: |
||
2592 | mov [cluster_tmp], eax |
||
2593 | mov [fat16_root], 0 |
||
2594 | cmp eax, [LAST_CLUSTER] |
||
2595 | ja .notfound |
||
2596 | cmp eax, 2 |
||
2597 | jae .data_cluster |
||
2598 | cmp [fat_type], 16 |
||
2599 | jnz .notfound |
||
2600 | mov eax, [ROOT_START] |
||
2601 | mov ecx, [ROOT_SECTORS] |
||
2602 | mov [fat16_root], 1 |
||
2603 | jmp .new_sector |
||
2604 | .data_cluster: |
||
2605 | dec eax |
||
2606 | dec eax |
||
2607 | mov ecx, [SECTORS_PER_CLUSTER] |
||
2608 | mul ecx |
||
2609 | add eax, [DATA_START] |
||
2610 | .new_sector: |
||
2611 | mov ebx, buffer |
||
2612 | call hd_read |
||
2613 | mov edi, ebx |
||
2614 | add ebx, 512 |
||
2615 | push eax |
||
2616 | .l1: |
||
2617 | call fat_get_name |
||
2618 | jc .l2 |
||
2619 | call fat_compare_name |
||
2620 | jz .found |
||
2621 | .l2: |
||
2622 | add edi, 0x20 |
||
2623 | cmp edi, ebx |
||
2624 | jb .l1 |
||
2625 | pop eax |
||
2626 | inc eax |
||
2627 | loop .new_sector |
||
2628 | cmp [fat16_root], 0 |
||
2629 | jnz .notfound |
||
2630 | mov eax, [cluster_tmp] |
||
2631 | call get_FAT |
||
2632 | cmp eax, 2 |
||
2633 | jb .notfound |
||
2634 | cmp eax, [fatRESERVED] |
||
2635 | jb .new_cluster |
||
2636 | .notfound: |
||
2637 | add esp, 262*2 |
||
2638 | popa |
||
2639 | stc |
||
2640 | ret |
||
2641 | .found: |
||
2642 | pop eax |
||
2643 | ; if this is LFN entry, advance to true entry |
||
2644 | cmp byte [edi+11], 0xF |
||
2645 | jnz .entryfound |
||
2646 | add edi, 0x20 |
||
2647 | cmp edi, ebx |
||
2648 | jb .entryfound |
||
2649 | inc eax |
||
2650 | dec ecx |
||
2651 | jnz .read_entry |
||
2652 | cmp [fat16_root], 0 |
||
2653 | jnz .notfound |
||
2654 | mov eax, [cluster_tmp] |
||
2655 | call get_FAT |
||
2656 | cmp eax, 2 |
||
2657 | jb .notfound |
||
2658 | cmp eax, [fatRESERVED] |
||
2659 | jae .notfound |
||
2660 | dec eax |
||
2661 | dec eax |
||
2662 | mul [SECTORS_PER_CLUSTER] |
||
2663 | add eax, [DATA_START] |
||
2664 | .read_entry: |
||
2665 | mov ebx, [buffer] |
||
2666 | call hd_read |
||
2667 | mov edi, ebx |
||
2668 | .entryfound: |
||
2669 | cmp byte [esi], 0 |
||
2670 | jz .done |
||
2671 | test byte [edi+11], 10h ; is a directory? |
||
2672 | jz .notfound |
||
2673 | mov eax, [edi+20-2] |
||
2674 | mov ax, [edi+26] |
||
2675 | jmp .mainloop |
||
2676 | .done: |
||
2677 | add esp, 262*2+4 ; CF=0 |
||
2678 | push edi |
||
2679 | popad |
||
2680 | ret |
||
2681 | |||
2682 | ;---------------------------------------------------------------- |
||
2683 | ; |
||
2684 | ; fs_HdRead - LFN variant for reading hard disk |
||
2685 | ; |
||
2686 | ; esi points to filename |
||
2687 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
2688 | ; may be ebx=0 - start from first byte |
||
2689 | ; ecx number of bytes to read, 0+ |
||
2690 | ; edx mem location to return data |
||
2691 | ; |
||
2692 | ; ret ebx = size or 0xffffffff file not found |
||
2693 | ; eax = 0 ok read or other = errormsg |
||
2694 | ; |
||
2695 | ;-------------------------------------------------------------- |
||
2696 | fs_HdRead: |
||
2697 | cmp [fat_type], 0 |
||
2698 | jnz @f |
||
2699 | or ebx, -1 |
||
2700 | mov eax, ERROR_UNKNOWN_FS |
||
2701 | ret |
||
2702 | @@: |
||
2703 | push edi |
||
2704 | cmp byte [esi], 0 |
||
2705 | jnz @f |
||
2706 | .noaccess: |
||
2707 | pop edi |
||
2708 | or ebx, -1 |
||
2709 | mov eax, ERROR_ACCESS_DENIED |
||
2710 | ret |
||
2711 | @@: |
||
2712 | call hd_find_lfn |
||
2713 | jnc .found |
||
2714 | pop edi |
||
2715 | or ebx, -1 |
||
2716 | mov eax, ERROR_FILE_NOT_FOUND |
||
2717 | ret |
||
2718 | .found: |
||
2719 | test byte [edi+11], 0x10 ; do not allow read directories |
||
2720 | jnz .noaccess |
||
2721 | test ebx, ebx |
||
2722 | jz .l1 |
||
2723 | cmp dword [ebx+4], 0 |
||
2724 | jz @f |
||
2725 | mov ebx, [edi+28] |
||
2726 | .reteof: |
||
2727 | mov eax, 6 |
||
2728 | pop edi |
||
2729 | ret |
||
2730 | @@: |
||
2731 | mov ebx, [ebx] |
||
2732 | .l1: |
||
2733 | push dword [edi+28] ; file size |
||
2734 | mov eax, [edi+20-2] |
||
2735 | mov ax, [edi+26] |
||
2736 | push ecx edx |
||
2737 | push dword [edi+28] |
||
2738 | ; now eax=cluster, ebx=position, ecx=count, edx=buffer for data |
||
2739 | .new_cluster: |
||
2740 | jecxz .new_sector |
||
2741 | test eax, eax |
||
2742 | jz .eof |
||
2743 | cmp eax, [fatRESERVED] |
||
2744 | jae .eof |
||
2745 | mov [cluster_tmp], eax |
||
2746 | dec eax |
||
2747 | dec eax |
||
2748 | mov edi, [SECTORS_PER_CLUSTER] |
||
2749 | imul eax, edi |
||
2750 | add eax, [DATA_START] |
||
2751 | .new_sector: |
||
2752 | test ecx, ecx |
||
2753 | jz .done |
||
2754 | sub ebx, 512 |
||
2755 | jae .skip |
||
2756 | add ebx, 512 |
||
2757 | jnz .force_buf |
||
2758 | cmp ecx, 512 |
||
2759 | jb .force_buf |
||
2760 | cmp dword [esp], 512 |
||
2761 | jb .force_buf |
||
2762 | ; we may read directly to given buffer |
||
2763 | push ebx |
||
2764 | mov ebx, edx |
||
2765 | call hd_read |
||
2766 | pop ebx |
||
2767 | add edx, 512 |
||
2768 | sub ecx, 512 |
||
2769 | sub dword [esp], 512 |
||
2770 | jmp .skip |
||
2771 | .force_buf: |
||
2772 | ; we must read sector to temporary buffer and then copy it to destination |
||
2773 | push eax ebx |
||
2774 | mov ebx, buffer |
||
2775 | call hd_read |
||
2776 | mov eax, ebx |
||
2777 | pop ebx |
||
2778 | add eax, ebx |
||
2779 | push ecx |
||
2780 | add ecx, ebx |
||
2781 | cmp ecx, 512 |
||
2782 | jbe @f |
||
2783 | mov ecx, 512 |
||
2784 | @@: |
||
2785 | sub ecx, ebx |
||
2786 | cmp ecx, [esp+8] |
||
2787 | jbe @f |
||
2788 | mov ecx, [esp+8] |
||
2789 | @@: |
||
2790 | mov ebx, edx |
||
2791 | call memmove |
||
2792 | add edx, ecx |
||
2793 | sub [esp], ecx |
||
2794 | sub [esp+8], ecx |
||
2795 | pop ecx |
||
2796 | pop eax |
||
2797 | xor ebx, ebx |
||
2798 | cmp [esp], ebx |
||
2799 | jnz .skip |
||
2800 | jecxz .done |
||
2801 | jmp .eof |
||
2802 | .skip: |
||
2803 | inc eax |
||
2804 | dec edi |
||
2805 | jnz .new_sector |
||
2806 | mov eax, [cluster_tmp] |
||
2807 | call get_FAT |
||
2808 | jmp .new_cluster |
||
2809 | .done: |
||
2810 | pop ebx edx ecx ebx edi |
||
2811 | xor eax, eax |
||
2812 | ret |
||
2813 | .eof: |
||
2814 | pop ebx edx ecx ebx |
||
2815 | jmp .reteof |
||
2816 | ; \end{diamond}>>>> |