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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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11 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
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12 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
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13 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
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14 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
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15 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
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16 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
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17 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
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18 | ;; 08.11.2004 rename - ATV ;; |
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19 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
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20 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
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21 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
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22 | ;; 06.9.2004 Fix free space by Mario79 added - MH ;; |
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23 | ;; 24.5.2004 Write back buffer for File_write -VT ;; |
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24 | ;; 20.5.2004 File_read function to work with syscall 58 - VT ;; |
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25 | ;; 30.3.2004 Error parameters at function return - VT ;; |
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26 | ;; 01.5.2002 Bugfix in device write - VT ;; |
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27 | ;; 20.5.2002 Hd status check - VT ;; |
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28 | ;; 29.6.2002 Improved fat32 verification - VT ;; |
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29 | ;; ;; |
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30 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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31 | |||
32 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
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33 | |||
34 | ERROR_DISK_BASE equ 1 |
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35 | ERROR_UNSUPPORTED_FS equ 2 |
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36 | ERROR_UNKNOWN_FS equ 3 |
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37 | ERROR_PARTITION equ 4 |
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38 | ERROR_FILE_NOT_FOUND equ 5 |
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39 | ERROR_END_OF_FILE equ 6 |
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40 | ERROR_MEMORY_POINTER equ 7 |
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41 | ERROR_DISK_FULL equ 8 |
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42 | ERROR_FAT_TABLE equ 9 |
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43 | ERROR_ACCESS_DENIED equ 10 |
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44 | |||
45 | PUSHAD_EAX equ [esp+28] |
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46 | PUSHAD_ECX equ [esp+24] |
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47 | PUSHAD_EDX equ [esp+20] |
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48 | PUSHAD_EBX equ [esp+16] |
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49 | PUSHAD_EBP equ [esp+8] |
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50 | PUSHAD_ESI equ [esp+4] |
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51 | PUSHAD_EDI equ [esp+0] |
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52 | |||
53 | align 4 |
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54 | ;****************************************************** |
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55 | ; Please do not change this place - variables in text |
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56 | ; Mario79 |
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57 | ; START place |
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58 | ;****************************************************** |
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59 | PARTITION_START dd 0x3f |
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60 | PARTITION_END dd 0 |
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61 | SECTORS_PER_FAT dd 0x1f3a |
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62 | NUMBER_OF_FATS dd 0x2 |
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63 | SECTORS_PER_CLUSTER dd 0x8 |
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64 | BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes |
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65 | ROOT_CLUSTER dd 2 ; first rootdir cluster |
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66 | FAT_START dd 0 ; start of fat table |
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67 | ROOT_START dd 0 ; start of rootdir (only fat16) |
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68 | ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16) |
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69 | DATA_START dd 0 ; start of data area (=first cluster 2) |
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70 | LAST_CLUSTER dd 0 ; last availabe cluster |
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71 | ADR_FSINFO dd 0 ; used only by fat32 |
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72 | |||
73 | fatRESERVED dd 0x0FFFFFF6 |
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74 | fatBAD dd 0x0FFFFFF7 |
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75 | fatEND dd 0x0FFFFFF8 |
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76 | fatMASK dd 0x0FFFFFFF |
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77 | |||
78 | fat_type db 0 ; 0=none, 16=fat16, 32=fat32 |
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79 | ;*************************************************************************** |
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80 | ; End place |
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81 | ; Mario79 |
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82 | ;*************************************************************************** |
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83 | cluster dd 0 ; used by file_write,makedir,append |
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84 | partition_count dd 0 ; partitions found by set_FAT32_variables |
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85 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
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86 | longname_sec2 dd 0 ; directory sectors for delete long filename |
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87 | |||
88 | hd_error dd 0 ; set by wait_for_sector_buffer |
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89 | hd_setup dd 0 |
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90 | hd_wait_timeout dd 0 |
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91 | |||
92 | cluster_tmp dd 0 ; used by analyze_directory |
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93 | ; and analyze_directory_to_write |
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94 | |||
95 | file_size dd 0 ; used by file_read |
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96 | |||
97 | sector_tmp dd 0 ; used by rename,append,file_write |
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98 | entry_pos dd 0 ; used by rename,append,file_write |
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99 | |||
100 | old_filesize dd 0 ; used by append |
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101 | new_filepos dd 0 ; used by append |
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102 | bytes2write dd 0 ; used by append |
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103 | |||
104 | cache_search_start dd 0 ; used by find_empty_slot |
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105 | |||
106 | fat_in_cache dd -1 |
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107 | fat_cache: times 512 db 0 |
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108 | |||
109 | uglobal |
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110 | Sector512: ; label for dev_hdcd.inc |
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111 | buffer: times 512 db 0 |
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112 | deltree_buffer: times 512 db 0 |
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113 | endg |
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114 | |||
115 | iglobal |
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116 | NewDirEntry1 db ". ",0x10 |
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117 | times 20 db 0 |
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118 | NewDirEntry2 db ".. ",0x10 |
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119 | times 20 db 0 |
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120 | endg |
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121 | |||
122 | uglobal |
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123 | dir_entry: times 32 db 0 |
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124 | |||
125 | startpath: times 255 db 0 |
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126 | |||
127 | fat16_root db 0 ; flag for fat16 rootdir |
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128 | f_del db 0 ; 1=overwrite fat entry |
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129 | fat_change db 0 ; 1=fat has changed |
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130 | |||
131 | endg |
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132 | |||
133 | iglobal |
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134 | partition_types: ; list of fat16/32 partitions |
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135 | db 0x04 ; DOS: fat16 <32M |
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136 | db 0x06 ; DOS: fat16 >32M |
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137 | db 0x0b ; WIN95: fat32 |
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138 | db 0x0c ; WIN95: fat32, LBA-mapped |
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139 | db 0x0e ; WIN95: fat16, LBA-mapped |
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140 | db 0x14 ; Hidden DOS: fat16 <32M |
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141 | db 0x16 ; Hidden DOS: fat16 >32M |
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142 | db 0x1b ; Hidden WIN95: fat32 |
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143 | db 0x1c ; Hidden WIN95: fat32, LBA-mapped |
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144 | db 0x1e ; Hidden WIN95: fat16, LBA-mapped |
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145 | db 0xc4 ; DRDOS/secured: fat16 <32M |
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146 | db 0xc6 ; DRDOS/secured: fat16 >32M |
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147 | db 0xcb ; DRDOS/secured: fat32 |
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148 | db 0xcc ; DRDOS/secured: fat32, LBA-mapped |
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149 | db 0xce ; DRDOS/secured: fat16, LBA-mapped |
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150 | db 0xd4 ; Old Multiuser DOS secured: fat16 <32M |
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151 | db 0xd6 ; Old Multiuser DOS secured: fat16 >32M |
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152 | partition_types_end: |
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153 | |||
154 | |||
155 | extended_types: ; list of extended partitions |
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156 | db 0x05 ; DOS: extended partition |
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157 | db 0x0f ; WIN95: extended partition, LBA-mapped |
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158 | db 0xc5 ; DRDOS/secured: extended partition |
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159 | db 0xd5 ; Old Multiuser DOS secured: extended partition |
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160 | extended_types_end: |
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161 | |||
162 | endg |
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163 | |||
164 | |||
165 | reserve_hd1: |
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166 | |||
167 | cli |
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168 | cmp [hd1_status],0 |
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169 | je reserve_ok1 |
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170 | |||
171 | sti |
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172 | call change_task |
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173 | jmp reserve_hd1 |
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174 | |||
175 | reserve_ok1: |
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176 | |||
177 | push eax |
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178 | mov eax,[0x3000] |
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179 | shl eax,5 |
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180 | mov eax,[eax+0x3000+4] |
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181 | mov [hd1_status],eax |
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182 | pop eax |
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183 | sti |
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184 | ret |
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185 | |||
186 | |||
187 | clear_hd_cache: |
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188 | |||
189 | push eax ecx edi |
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190 | mov edi,0x600000 |
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191 | mov ecx,16384 |
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192 | xor eax,eax |
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193 | cld |
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194 | rep stosd ; clear hd cache with 0 |
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195 | mov [cache_search_start],eax |
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196 | mov [fat_in_cache],-1 |
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197 | mov [fat_change],0 |
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198 | pop edi ecx eax |
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199 | ret |
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200 | |||
201 | problem_partition db 0 ; used for partitions search |
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202 | |||
203 | ; Partition chain used: |
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204 | ; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4 |
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205 | ;========================================================== |
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206 | ; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +-- |
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207 | ; extended --+ extended --+ extended --+ extended --+ |
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208 | ; 0 0 0 0 |
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209 | ; 0 0 0 0 |
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210 | ; Notes: |
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211 | ; - extended partition need to be in second entry on table |
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212 | ; - it will skip over removed partitions |
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213 | |||
214 | set_FAT32_variables: |
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215 | mov [0xfe10],dword 0 ; entries in hd cache |
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216 | mov [problem_partition],0 |
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217 | call reserve_hd1 |
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218 | call clear_hd_cache |
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219 | |||
220 | cmp dword [hdpos],0 |
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221 | je problem_hd |
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222 | |||
223 | pushad |
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224 | xor ecx,ecx ; partition count |
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225 | mov edx,-1 ; flag for partition |
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226 | xor eax,eax ; read MBR |
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227 | xor ebp,ebp ; extended partition start |
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228 | |||
229 | new_partition: |
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230 | test ebp,ebp ; is there extended partition? |
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231 | jnz extended_already_set ; yes |
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232 | xchg ebp,eax ; no. set it now |
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233 | |||
234 | extended_already_set: |
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235 | add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start |
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236 | mov ebx,buffer |
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237 | call hd_read |
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238 | |||
239 | cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector? |
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240 | jnz end_partition_chain |
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241 | cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition |
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242 | jz next_partition |
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243 | |||
244 | push eax ecx |
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245 | mov edi,partition_types |
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246 | mov ecx,partition_types_end-partition_types |
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247 | mov al,[ebx+0x1be+4] ; get partition type |
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248 | cld |
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249 | repne scasb ; is partition type ok? |
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250 | pop ecx eax |
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251 | jnz next_partition ; no. skip over |
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252 | |||
253 | inc ecx |
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254 | cmp ecx,[fat32part] ; is it wanted partition? |
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255 | jnz next_partition ; no |
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256 | |||
257 | mov edx,eax ; start sector |
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258 | add edx,[ebx+0x1be+8] ; add relative start |
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259 | |||
260 | next_partition: |
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261 | push ecx |
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262 | mov edi,extended_types |
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263 | mov ecx,extended_types_end-extended_types |
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264 | mov al,[ebx+0x1be+4+16] ; get second partition type |
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265 | cld |
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266 | repne scasb ; is it extended partition? |
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267 | pop ecx |
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268 | jnz end_partition_chain ; no. end chain |
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269 | |||
270 | mov eax,[ebx+0x1be+8+16] ; get start of extended partition |
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271 | test eax,eax ; is there extended partition? |
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272 | jnz new_partition ; yes. read it |
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273 | |||
274 | end_partition_chain: |
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275 | mov [partition_count],ecx |
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276 | |||
277 | cmp edx,-1 ; found wanted partition? |
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278 | jnz hd_and_partition_ok ; yes. install it |
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279 | jmp problem_partition_or_fat |
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280 | |||
281 | problem_fat_dec_count: ; bootsector is missing or another problem |
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282 | dec [partition_count] ; remove it from partition_count |
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283 | |||
284 | problem_partition_or_fat: |
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285 | popad |
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286 | |||
287 | problem_hd: |
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288 | mov [fat_type],0 |
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289 | mov [hd1_status],0 ; free |
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290 | mov [problem_partition],1 |
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291 | ret |
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292 | |||
293 | hd_and_partition_ok: |
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294 | mov eax,edx |
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295 | mov [PARTITION_START],eax |
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296 | |||
297 | mov [hd_setup],1 |
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298 | mov ebx,buffer |
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299 | call hd_read ; read boot sector of partition |
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300 | mov [hd_setup],0 |
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301 | |||
302 | cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector? |
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303 | jnz problem_fat_dec_count |
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304 | |||
305 | movzx eax,word [ebx+0xe] ; sectors reserved |
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306 | add eax,[PARTITION_START] |
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307 | mov [FAT_START],eax ; fat_start = partition_start + reserved |
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308 | |||
309 | movzx eax,byte [ebx+0xd] ; sectors per cluster |
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310 | mov [SECTORS_PER_CLUSTER],eax |
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311 | |||
312 | movzx ecx,word [ebx+0xb] ; bytes per sector |
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313 | mov [BYTES_PER_SECTOR],ecx |
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314 | |||
315 | movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32) |
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316 | mov edx,32 |
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317 | mul edx |
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318 | dec ecx |
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319 | add eax,ecx ; round up if not equal count |
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320 | inc ecx ; bytes per sector |
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321 | div ecx |
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322 | mov [ROOT_SECTORS],eax ; count of rootdir sectors |
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323 | |||
324 | movzx eax,word [ebx+0x16] ; sectors per fat <65536 |
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325 | test eax,eax |
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326 | jnz fat16_fatsize |
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327 | mov eax,[ebx+0x24] ; sectors per fat |
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328 | fat16_fatsize: |
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329 | mov [SECTORS_PER_FAT],eax |
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330 | |||
331 | movzx eax,byte [ebx+0x10] ; number of fats |
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332 | test eax,eax ; if 0 it's not fat partition |
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333 | jz problem_fat_dec_count |
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334 | mov [NUMBER_OF_FATS],eax |
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335 | imul eax,[SECTORS_PER_FAT] |
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336 | add eax,[FAT_START] |
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337 | mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count |
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338 | add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32 |
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339 | mov [DATA_START],eax ; data area = rootdir + rootdir_size |
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340 | |||
341 | movzx eax,word [ebx+0x13] ; total sector count <65536 |
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342 | test eax,eax |
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343 | jnz fat16_total |
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344 | mov eax,[ebx+0x20] ; total sector count |
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345 | fat16_total: |
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346 | add eax,[PARTITION_START] |
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347 | dec eax |
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348 | mov [PARTITION_END],eax |
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349 | inc eax |
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350 | sub eax,[DATA_START] ; eax = count of data sectors |
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351 | xor edx,edx |
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352 | div dword [SECTORS_PER_CLUSTER] |
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353 | inc eax |
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354 | mov [LAST_CLUSTER],eax |
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355 | dec eax ; cluster count |
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356 | |||
357 | ; limits by Microsoft Hardware White Paper v1.03 |
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358 | cmp eax,4085 ; 0xff5 |
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359 | jb problem_fat_dec_count ; fat12 not supported |
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360 | cmp eax,65525 ; 0xfff5 |
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361 | jb fat16_partition |
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362 | |||
363 | fat32_partition: |
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364 | mov eax,[ebx+0x2c] ; rootdir cluster |
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365 | mov [ROOT_CLUSTER],eax |
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366 | movzx eax,word [ebx+0x30] ; fs info sector |
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367 | add eax,[PARTITION_START] |
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368 | mov [ADR_FSINFO],eax |
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369 | |||
370 | popad |
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371 | |||
372 | mov [fatRESERVED],0x0FFFFFF6 |
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373 | mov [fatBAD],0x0FFFFFF7 |
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374 | mov [fatEND],0x0FFFFFF8 |
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375 | mov [fatMASK],0x0FFFFFFF |
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376 | mov [fat_type],32 ; Fat32 |
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377 | mov [hd1_status],0 ; free |
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378 | ret |
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379 | |||
380 | fat16_partition: |
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381 | xor eax,eax |
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382 | mov [ROOT_CLUSTER],eax |
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383 | |||
384 | popad |
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385 | |||
386 | mov [fatRESERVED],0x0000FFF6 |
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387 | mov [fatBAD],0x0000FFF7 |
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388 | mov [fatEND],0x0000FFF8 |
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389 | mov [fatMASK],0x0000FFFF |
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390 | mov [fat_type],16 ; Fat16 |
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391 | mov [hd1_status],0 ; free |
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392 | ret |
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393 | |||
394 | |||
395 | set_FAT: |
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396 | ;-------------------------------- |
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397 | ; input : EAX = cluster |
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398 | ; EDX = value to save |
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399 | ; output : EDX = old value |
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400 | ;-------------------------------- |
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401 | push eax ebx esi |
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402 | |||
403 | cmp eax,2 |
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404 | jb sfc_error |
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405 | cmp eax,[LAST_CLUSTER] |
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406 | ja sfc_error |
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407 | cmp [fat_type],16 |
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408 | je sfc_1 |
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409 | add eax,eax |
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410 | sfc_1: |
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411 | add eax,eax |
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412 | mov esi,511 |
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413 | and esi,eax ; esi = position in fat sector |
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414 | shr eax,9 ; eax = fat sector |
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415 | add eax,[FAT_START] |
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416 | mov ebx,fat_cache |
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417 | |||
418 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
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419 | je sfc_in_cache ; yes |
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420 | |||
421 | cmp [fat_change],0 ; is fat changed? |
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422 | je sfc_no_change ; no |
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423 | call write_fat_sector ; yes. write it into disk |
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424 | |||
425 | sfc_no_change: |
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426 | mov [fat_in_cache],eax ; save fat sector |
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427 | call hd_read |
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428 | |||
429 | sfc_in_cache: |
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430 | cmp [fat_type],16 |
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431 | jne sfc_test32 |
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432 | |||
433 | cmp [f_del],1 ; overwrite previous value? |
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434 | je sfc_set16 ; yes |
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435 | cmp word [ebx+esi],0 ; is cluster free? |
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436 | je sfc_set16 ; yes |
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437 | mov dword [8*0x100000],0xffffff |
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438 | mov edx,[ebx+esi] ; get old value |
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439 | jmp sfc_nonzero |
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440 | |||
441 | sfc_set16: |
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442 | xchg [ebx+esi],dx ; save new value and get old value |
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443 | jmp sfc_write |
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444 | |||
445 | sfc_test32: |
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446 | mov eax,[fatMASK] |
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447 | cmp [f_del],1 ; overwrite previous value? |
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448 | je sfc_set32 ; yes |
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449 | test eax,[ebx+esi] ; is cluster free? |
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450 | je sfc_set32 ; yes |
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451 | mov dword [8*0x100000],0xffffff |
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452 | mov edx,[ebx+esi] ; get old value |
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453 | jmp sfc_nonzero |
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454 | |||
455 | sfc_set32: |
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456 | and edx,eax |
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457 | xor eax,-1 ; mask for high bits |
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458 | and eax,[ebx+esi] ; get high 4 bits |
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459 | or eax,edx |
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460 | mov edx,[ebx+esi] ; get old value |
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461 | mov [ebx+esi],eax ; save new value |
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462 | |||
463 | sfc_write: |
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464 | mov [fat_change],1 ; fat has changed |
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465 | |||
466 | sfc_nonzero: |
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467 | and edx,[fatMASK] |
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468 | |||
469 | sfc_error: |
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470 | pop esi ebx eax |
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471 | ret |
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472 | |||
473 | |||
474 | get_FAT: |
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475 | ;-------------------------------- |
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476 | ; input : EAX = cluster |
||
477 | ; output : EAX = next cluster |
||
478 | ;-------------------------------- |
||
479 | push ebx esi |
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480 | |||
481 | cmp [fat_type],16 |
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482 | je gfc_1 |
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483 | add eax,eax |
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484 | gfc_1: |
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485 | add eax,eax |
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486 | mov esi,511 |
||
487 | and esi,eax ; esi = position in fat sector |
||
488 | shr eax,9 ; eax = fat sector |
||
489 | add eax,[FAT_START] |
||
490 | mov ebx,fat_cache |
||
491 | |||
492 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
||
493 | je gfc_in_cache |
||
494 | |||
495 | cmp [fat_change],0 ; is fat changed? |
||
496 | je gfc_no_change ; no |
||
497 | call write_fat_sector ; yes. write it into disk |
||
498 | |||
499 | gfc_no_change: |
||
500 | mov [fat_in_cache],eax |
||
501 | call hd_read |
||
502 | |||
503 | gfc_in_cache: |
||
504 | mov eax,[ebx+esi] |
||
505 | and eax,[fatMASK] |
||
506 | pop esi ebx |
||
507 | ret |
||
508 | |||
509 | |||
510 | get_free_FAT: |
||
511 | ;----------------------------------------------------------- |
||
512 | ; input : EAX = # cluster for start the searching |
||
513 | ; output : if CARRY=0 EAX = # first cluster found free |
||
514 | ; if CARRY=1 disk full |
||
515 | ; Note : for more speed need to use fat_cache directly |
||
516 | ;----------------------------------------------------------- |
||
517 | push ecx |
||
518 | mov ecx,[LAST_CLUSTER] ; counter for full disk |
||
519 | sub ecx,2 |
||
520 | |||
521 | gff_test: |
||
522 | cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2 |
||
523 | jbe gff_in_range |
||
524 | mov eax,2 |
||
525 | |||
526 | gff_in_range: |
||
527 | push eax |
||
528 | call get_FAT ; get cluster state |
||
529 | test eax,eax ; is it free? |
||
530 | pop eax |
||
531 | je gff_found ; yes |
||
532 | inc eax ; next cluster |
||
533 | dec ecx ; is all checked? |
||
534 | jns gff_test ; no |
||
535 | |||
536 | gff_not_found: |
||
537 | pop ecx ; yes. disk is full |
||
538 | stc |
||
539 | ret |
||
540 | |||
541 | gff_found: |
||
542 | pop ecx |
||
543 | clc |
||
544 | ret |
||
545 | |||
546 | |||
547 | write_fat_sector: |
||
548 | ;----------------------------------------------------------- |
||
549 | ; write changed fat to disk |
||
550 | ;----------------------------------------------------------- |
||
551 | push eax ebx ecx |
||
552 | |||
553 | mov [fat_change],0 |
||
554 | mov eax,[fat_in_cache] |
||
555 | cmp eax,-1 |
||
556 | jz write_fat_not_used |
||
557 | mov ebx,fat_cache |
||
558 | mov ecx,[NUMBER_OF_FATS] |
||
559 | |||
560 | write_next_fat: |
||
561 | call hd_write |
||
562 | add eax,[SECTORS_PER_FAT] |
||
563 | dec ecx |
||
564 | jnz write_next_fat |
||
565 | |||
566 | write_fat_not_used: |
||
567 | pop ecx ebx eax |
||
568 | ret |
||
569 | |||
570 | |||
571 | analyze_directory: |
||
572 | ;----------------------------------------------------------- |
||
573 | ; input : EAX = first cluster of the directory |
||
574 | ; EBX = pointer to filename |
||
575 | ; output : IF CARRY=0 EAX = sector where th file is found |
||
576 | ; EBX = pointer in buffer |
||
577 | ; [buffer .. buffer+511] |
||
578 | ; ECX,EDX,ESI,EDI not changed |
||
579 | ; IF CARRY=1 filename not found |
||
580 | ; Note : if cluster=0 it's changed to read rootdir |
||
581 | ; save 2 previous directory sectors in longname_sec |
||
582 | ;----------------------------------------------------------- |
||
583 | push ecx edx esi edi ebx ; ebx = [esp+0] |
||
584 | mov [longname_sec1],0 |
||
585 | mov [longname_sec2],0 |
||
586 | |||
587 | adr_new_cluster: |
||
588 | mov [cluster_tmp],eax |
||
589 | mov [fat16_root],0 |
||
590 | cmp eax,[LAST_CLUSTER] |
||
591 | ja adr_not_found ; too big cluster number, something is wrong |
||
592 | cmp eax,2 |
||
593 | jnb adr_data_cluster |
||
594 | |||
595 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
596 | cmp [fat_type],16 |
||
597 | jne adr_data_cluster |
||
598 | mov eax,[ROOT_START] |
||
599 | mov edx,[ROOT_SECTORS] |
||
600 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
601 | jmp adr_new_sector |
||
602 | |||
603 | adr_data_cluster: |
||
604 | sub eax,2 |
||
605 | mov edx,[SECTORS_PER_CLUSTER] |
||
606 | imul eax,edx |
||
607 | add eax,[DATA_START] |
||
608 | |||
609 | adr_new_sector: |
||
610 | mov ebx,buffer |
||
611 | call hd_read |
||
612 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
||
613 | |||
614 | adr_analyze: |
||
615 | mov edi,[ebx+11] ; file attribute |
||
616 | and edi,0xf |
||
617 | cmp edi,0xf |
||
618 | je adr_long_filename |
||
619 | test edi,0x8 ; skip over volume label |
||
620 | jne adr_long_filename ; Note: label can be same name as file/dir |
||
621 | |||
622 | mov esi,[esp+0] ; filename need to be uppercase |
||
623 | mov edi,ebx |
||
624 | push ecx |
||
625 | mov ecx,11 |
||
626 | cld |
||
627 | rep cmpsb ; compare 8+3 filename |
||
628 | pop ecx |
||
629 | je adr_found |
||
630 | |||
631 | adr_long_filename: |
||
632 | add ebx,32 ; position of next dir entry |
||
633 | dec ecx |
||
634 | jnz adr_analyze |
||
635 | |||
636 | mov ecx,[longname_sec1] ; save 2 previous directory sectors |
||
637 | mov [longname_sec1],eax ; for delete long filename |
||
638 | mov [longname_sec2],ecx |
||
639 | inc eax ; next sector |
||
640 | dec edx |
||
641 | jne adr_new_sector |
||
642 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
643 | je adr_not_found |
||
644 | |||
645 | adr_next_cluster: |
||
646 | mov eax,[cluster_tmp] |
||
647 | call get_FAT ; get next cluster |
||
648 | cmp eax,2 ; incorrect fat chain? |
||
649 | jb adr_not_found ; yes |
||
650 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
651 | jb adr_new_cluster ; no. analyse it |
||
652 | |||
653 | adr_not_found: |
||
654 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
655 | stc ; file not found |
||
656 | ret |
||
657 | |||
658 | adr_found: |
||
659 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
660 | clc ; file found |
||
661 | ret |
||
662 | |||
663 | |||
664 | analyze_directory_to_write: |
||
665 | ;----------------------------------------------------------- |
||
666 | ; input : EAX = first cluster of the directory |
||
667 | ; output : IF CARRY=0 EAX = sector where the empty pos is found |
||
668 | ; EBX = pointer in buffer |
||
669 | ; [buffer .. buffer+511] |
||
670 | ; ECX,EDX,ESI,EDI not changed |
||
671 | ; IF CARRY=1 disk full or fat corrupted |
||
672 | ; Note : if cluster=0 it's changed to read rootdir |
||
673 | ;----------------------------------------------------------- |
||
674 | push ecx edx edi |
||
675 | |||
676 | adw_new_cluster: |
||
677 | mov [cluster_tmp],eax |
||
678 | mov [fat16_root],0 |
||
679 | cmp eax,[LAST_CLUSTER] |
||
680 | ja adw_not_found ; too big cluster number, something is wrong |
||
681 | cmp eax,2 |
||
682 | jnb adw_data_cluster |
||
683 | |||
684 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
685 | cmp [fat_type],16 |
||
686 | jne adw_data_cluster |
||
687 | mov eax,[ROOT_START] |
||
688 | mov edx,[ROOT_SECTORS] |
||
689 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
690 | jmp adw_new_sector |
||
691 | |||
692 | adw_data_cluster: |
||
693 | sub eax,2 |
||
694 | mov edx,[SECTORS_PER_CLUSTER] |
||
695 | imul eax,edx |
||
696 | add eax,[DATA_START] |
||
697 | |||
698 | adw_new_sector: |
||
699 | mov ebx,buffer |
||
700 | call hd_read |
||
701 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
||
702 | |||
703 | adw_analyze: |
||
704 | cmp byte [ebx],0x00 ; is free entry? |
||
705 | je adw_found ; yes |
||
706 | cmp byte [ebx],0xe5 ; is deleted entry? |
||
707 | je adw_found ; yes |
||
708 | add ebx,32 ; position of next dir entry |
||
709 | dec ecx |
||
710 | jnz adw_analyze |
||
711 | |||
712 | inc eax ; next sector |
||
713 | dec edx |
||
714 | jne adw_new_sector |
||
715 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
716 | je adw_not_found |
||
717 | |||
718 | mov eax,[cluster_tmp] |
||
719 | call get_FAT ; get next cluster |
||
720 | cmp eax,2 ; incorrect fat chain? |
||
721 | jb adw_not_found ; yes |
||
722 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
723 | jb adw_new_cluster ; no. analyse it |
||
724 | |||
725 | mov eax,2 ; this block of code add a new cluster |
||
726 | call get_free_FAT ; for the directory because the directory |
||
727 | jc adw_not_found ; is full |
||
728 | |||
729 | mov edx,[fatEND] ; new end for directory |
||
730 | call set_FAT |
||
731 | |||
732 | push eax ; save new cluster |
||
733 | mov edx,eax |
||
734 | mov eax,[cluster_tmp] ; change last cluster to point new cluster |
||
735 | mov [f_del],1 |
||
736 | call set_FAT |
||
737 | mov [f_del],0 |
||
738 | |||
739 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
740 | call add_disk_free_space |
||
741 | |||
742 | mov ecx,512/4 |
||
743 | xor eax,eax |
||
744 | mov edi,buffer |
||
745 | cld |
||
746 | rep stosd ; clear new directory cluster |
||
747 | pop eax |
||
748 | |||
749 | sub eax,2 |
||
750 | mov ecx,[SECTORS_PER_CLUSTER] |
||
751 | imul eax,ecx |
||
752 | add eax,[DATA_START] |
||
753 | mov ebx,buffer |
||
754 | push eax ; save sector number |
||
755 | |||
756 | adw_set_empty_directory: |
||
757 | call hd_write |
||
758 | inc eax ; next sector |
||
759 | dec ecx |
||
760 | jnz adw_set_empty_directory |
||
761 | |||
762 | pop eax |
||
763 | |||
764 | adw_found: |
||
765 | pop edi edx ecx |
||
766 | clc ; free space found |
||
767 | ret |
||
768 | |||
769 | adw_not_found: |
||
770 | pop edi edx ecx |
||
771 | stc ; free space not found |
||
772 | ret |
||
773 | |||
774 | |||
775 | get_data_cluster: |
||
776 | ;----------------------------------------------------------- |
||
777 | ; input : EAX = cluster |
||
778 | ; EBX = pointer to buffer |
||
779 | ; EDX = # blocks to read in buffer |
||
780 | ; ESI = # blocks to skip over |
||
781 | ; output : if CARRY=0 ok EBX/EDX/ESI updated |
||
782 | ; if CARRY=1 cluster out of range |
||
783 | ; Note : if cluster=0 it's changed to read rootdir |
||
784 | ;----------------------------------------------------------- |
||
785 | push eax ecx |
||
786 | |||
787 | mov [fat16_root],0 |
||
788 | cmp eax,[LAST_CLUSTER] |
||
789 | ja gdc_error ; too big cluster number, something is wrong |
||
790 | cmp eax,2 |
||
791 | jnb gdc_cluster |
||
792 | |||
793 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
794 | cmp [fat_type],16 |
||
795 | jne gdc_cluster |
||
796 | mov eax,[ROOT_START] |
||
797 | mov ecx,[ROOT_SECTORS] ; Note: not cluster size |
||
798 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
799 | jmp gdc_read |
||
800 | |||
801 | gdc_cluster: |
||
802 | sub eax,2 |
||
803 | mov ecx,[SECTORS_PER_CLUSTER] |
||
804 | imul eax,ecx |
||
805 | add eax,[DATA_START] |
||
806 | |||
807 | gdc_read: |
||
808 | test esi,esi ; first wanted block |
||
809 | je gdcl1 ; yes, skip count is 0 |
||
810 | dec esi |
||
811 | jmp gdcl2 |
||
812 | |||
813 | gdcl1: |
||
814 | call hd_read |
||
815 | add ebx,512 ; update pointer |
||
816 | dec edx |
||
817 | |||
818 | gdcl2: |
||
819 | test edx,edx ; is all read? |
||
820 | je out_of_read |
||
821 | |||
822 | inc eax ; next sector |
||
823 | dec ecx |
||
824 | jnz gdc_read |
||
825 | |||
826 | out_of_read: |
||
827 | pop ecx eax |
||
828 | clc |
||
829 | ret |
||
830 | |||
831 | gdc_error: |
||
832 | pop ecx eax |
||
833 | stc |
||
834 | ret |
||
835 | |||
836 | |||
837 | set_data_cluster: |
||
838 | ;----------------------------------------------------------- |
||
839 | ; input : EAX = cluster |
||
840 | ; EBX = pointer to buffer |
||
841 | ; output : if CARRY=0 ok |
||
842 | ; if CARRY=1 cluster out of range |
||
843 | ;----------------------------------------------------------- |
||
844 | push eax ebx edx |
||
845 | |||
846 | cmp eax,[LAST_CLUSTER] |
||
847 | ja sdc_error ; too big cluster number, something is wrong |
||
848 | sub eax,2 |
||
849 | jb sdc_error ; don't allow rootdir write |
||
850 | |||
851 | mov edx,[SECTORS_PER_CLUSTER] |
||
852 | imul eax,edx |
||
853 | add eax,[DATA_START] |
||
854 | |||
855 | sdc_write: |
||
856 | call hd_write |
||
857 | add ebx,512 ; update pointer |
||
858 | inc eax |
||
859 | dec edx |
||
860 | jnz sdc_write |
||
861 | pop edx ebx eax |
||
862 | clc |
||
863 | ret |
||
864 | |||
865 | sdc_error: |
||
866 | pop edx ebx eax |
||
867 | stc |
||
868 | ret |
||
869 | |||
870 | |||
871 | get_cluster_of_a_path: |
||
872 | ;--------------------------------------------------------- |
||
873 | ; input : EBX = pointer to a path string |
||
874 | ; (example: the path "/files/data/document" become |
||
875 | ; "files......data.......document...0" |
||
876 | ; '.' = space char |
||
877 | ; '0' = char(0) (ASCII=0) !!! ) |
||
878 | ; output : if (CARRY=1) -> ERROR in the PATH |
||
879 | ; if (CARRY=0) -> EAX=cluster |
||
880 | ;--------------------------------------------------------- |
||
881 | push ebx edx |
||
882 | |||
883 | mov eax,[ROOT_CLUSTER] |
||
884 | mov edx,ebx |
||
885 | |||
886 | search_end_of_path: |
||
887 | cmp byte [edx],0 |
||
888 | je found_end_of_path |
||
889 | |||
890 | inc edx ; '/' |
||
891 | mov ebx,edx |
||
892 | call analyze_directory |
||
893 | jc directory_not_found |
||
894 | |||
895 | mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field |
||
896 | mov ax,[ebx+26] ; read the LOW 16bit cluster field |
||
897 | and eax,[fatMASK] |
||
898 | add edx,11 ; 8+3 (name+extension) |
||
899 | jmp search_end_of_path |
||
900 | |||
901 | found_end_of_path: |
||
902 | pop edx ebx |
||
903 | clc ; no errors |
||
904 | ret |
||
905 | |||
906 | directory_not_found: |
||
907 | pop edx ebx |
||
908 | stc ; errors occour |
||
909 | ret |
||
910 | |||
911 | |||
912 | bcd2bin: |
||
913 | ;---------------------------------- |
||
914 | ; input : AL=BCD number (eg. 0x11) |
||
915 | ; output : AH=0 |
||
916 | ; AL=decimal number (eg. 11) |
||
917 | ;---------------------------------- |
||
918 | xor ah,ah |
||
919 | shl ax,4 |
||
920 | shr al,4 |
||
921 | aad |
||
922 | ret |
||
923 | |||
924 | |||
925 | get_date_for_file: |
||
926 | ;----------------------------------------------------- |
||
927 | ; Get date from CMOS and pack day,month,year in AX |
||
928 | ; DATE bits 0..4 : day of month 0..31 |
||
929 | ; 5..8 : month of year 1..12 |
||
930 | ; 9..15 : count of years from 1980 |
||
931 | ;----------------------------------------------------- |
||
932 | mov al,0x7 ;day |
||
933 | out 0x70,al |
||
934 | in al,0x71 |
||
935 | call bcd2bin |
||
936 | ror eax,5 |
||
937 | |||
938 | mov al,0x8 ;month |
||
939 | out 0x70,al |
||
940 | in al,0x71 |
||
941 | call bcd2bin |
||
942 | ror eax,4 |
||
943 | |||
944 | mov al,0x9 ;year |
||
945 | out 0x70,al |
||
946 | in al,0x71 |
||
947 | call bcd2bin |
||
948 | add ax,20 ;because CMOS return only the two last |
||
949 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
950 | rol eax,9 ;need the difference with 1980 (eg. 2001-1980) |
||
951 | ret |
||
952 | |||
953 | |||
954 | get_time_for_file: |
||
955 | ;----------------------------------------------------- |
||
956 | ; Get time from CMOS and pack hour,minute,second in AX |
||
957 | ; TIME bits 0..4 : second (the low bit is lost) |
||
958 | ; 5..10 : minute 0..59 |
||
959 | ; 11..15 : hour 0..23 |
||
960 | ;----------------------------------------------------- |
||
961 | mov al,0x0 ;second |
||
962 | out 0x70,al |
||
963 | in al,0x71 |
||
964 | call bcd2bin |
||
965 | ror eax,6 |
||
966 | |||
967 | mov al,0x2 ;minute |
||
968 | out 0x70,al |
||
969 | in al,0x71 |
||
970 | call bcd2bin |
||
971 | ror eax,6 |
||
972 | |||
973 | mov al,0x4 ;hour |
||
974 | out 0x70,al |
||
975 | in al,0x71 |
||
976 | call bcd2bin |
||
977 | rol eax,11 |
||
978 | ret |
||
979 | |||
980 | |||
981 | set_current_time_for_entry: |
||
982 | ;----------------------------------------------------- |
||
983 | ; Set current time/date for file entry |
||
984 | ; input : ebx = file entry pointer |
||
985 | ;----------------------------------------------------- |
||
986 | push eax |
||
987 | call get_time_for_file ; update files date/time |
||
988 | mov [ebx+22],ax |
||
989 | call get_date_for_file |
||
990 | mov [ebx+24],ax |
||
991 | pop eax |
||
992 | ret |
||
993 | |||
994 | |||
995 | makedir: |
||
996 | ;----------------------------------------------------- |
||
997 | ; input : eax = directory name |
||
998 | ; edx = path |
||
999 | ; output : eax = 0 - ok |
||
1000 | ; 3 - unknown FS |
||
1001 | ; 5 - file not found |
||
1002 | ; 8 - disk full |
||
1003 | ; 10 - access denied |
||
1004 | ; Note : can only make one directory at time |
||
1005 | ;----------------------------------------------------- |
||
1006 | cmp [fat_type],0 |
||
1007 | jnz make_dir_fat_ok |
||
1008 | mov eax,ERROR_UNKNOWN_FS |
||
1009 | ret |
||
1010 | |||
1011 | make_dir_fat_ok: |
||
1012 | ; call reserve_hd1 |
||
1013 | |||
1014 | pushad |
||
1015 | |||
1016 | mov ebx,edx |
||
1017 | call get_cluster_of_a_path |
||
1018 | jnc make_dir_found_path |
||
1019 | |||
1020 | make_dir_path_not_found: |
||
1021 | popad |
||
1022 | call update_disk ; write all of cache and fat to hd |
||
1023 | mov [hd1_status],0 |
||
1024 | mov eax,ERROR_FILE_NOT_FOUND |
||
1025 | ret |
||
1026 | |||
1027 | make_dir_disk_full: |
||
1028 | popad |
||
1029 | call update_disk ; write all of cache and fat to hd |
||
1030 | mov [hd1_status],0 |
||
1031 | mov eax,ERROR_DISK_FULL |
||
1032 | ret |
||
1033 | |||
1034 | make_dir_already_exist: |
||
1035 | mov eax,[cluster] ; directory cluster |
||
1036 | xor edx,edx ; free |
||
1037 | mov [f_del],1 |
||
1038 | call set_FAT |
||
1039 | mov [f_del],0 |
||
1040 | |||
1041 | popad |
||
1042 | call update_disk ; write all of cache and fat to hd |
||
1043 | mov [hd1_status],0 |
||
1044 | mov eax,ERROR_ACCESS_DENIED |
||
1045 | ret |
||
1046 | |||
1047 | make_dir_found_path: |
||
1048 | cmp eax,[ROOT_CLUSTER] |
||
1049 | jnz make_dir_not_root |
||
1050 | xor eax,eax |
||
1051 | |||
1052 | make_dir_not_root: |
||
1053 | mov ecx,eax ; directorys start cluster |
||
1054 | mov word [NewDirEntry2+26],cx ; 16 bits low of cluster |
||
1055 | shr ecx,16 |
||
1056 | mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1057 | |||
1058 | push eax ; save parent directory cluster |
||
1059 | mov eax,2 |
||
1060 | call get_free_FAT |
||
1061 | mov [cluster],eax ; first free cluster |
||
1062 | pop eax |
||
1063 | jc make_dir_disk_full |
||
1064 | |||
1065 | push eax |
||
1066 | mov eax,[cluster] ; directory cluster |
||
1067 | mov edx,[fatEND] ; end for directory |
||
1068 | call set_FAT |
||
1069 | pop eax |
||
1070 | |||
1071 | mov ebx,PUSHAD_EAX ; dir name |
||
1072 | push eax |
||
1073 | call analyze_directory ; check if directory already exist |
||
1074 | pop eax |
||
1075 | jnc make_dir_already_exist ; need to free allocated cluster! |
||
1076 | |||
1077 | call analyze_directory_to_write |
||
1078 | jc make_dir_already_exist ; need to free allocated cluster! |
||
1079 | |||
1080 | mov esi,PUSHAD_EAX ; dir name |
||
1081 | mov edi,ebx ; pointer in buffer |
||
1082 | mov ecx,11 |
||
1083 | cld |
||
1084 | rep movsb |
||
1085 | |||
1086 | mov dword [ebx+28],0 ; dir size is always 0 |
||
1087 | mov ecx,[cluster] |
||
1088 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1089 | mov word [NewDirEntry1+26],cx |
||
1090 | shr ecx,16 |
||
1091 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1092 | mov word [NewDirEntry1+20],cx |
||
1093 | mov byte [ebx+11],0x10 ; attribute = directory |
||
1094 | |||
1095 | call set_current_time_for_entry |
||
1096 | mov ecx,[ebx+22] |
||
1097 | mov dword [NewDirEntry1+22],ecx |
||
1098 | mov dword [NewDirEntry2+22],ecx |
||
1099 | |||
1100 | mov ebx,buffer ; save the directory name,length,cluster |
||
1101 | call hd_write |
||
1102 | |||
1103 | mov ecx,512/4 |
||
1104 | xor eax,eax |
||
1105 | mov edi,buffer |
||
1106 | cld |
||
1107 | rep stosd ; clear new directory cluster |
||
1108 | |||
1109 | mov eax,[cluster] ; new directory cluster |
||
1110 | sub eax,2 |
||
1111 | mov edx,[SECTORS_PER_CLUSTER] |
||
1112 | imul eax,edx |
||
1113 | add eax,[DATA_START] |
||
1114 | mov ebx,buffer |
||
1115 | add eax,edx ; start from last sector |
||
1116 | |||
1117 | dir_set_empty_directory: |
||
1118 | dec eax ; next sector |
||
1119 | cmp edx,1 ; is first directory sector? |
||
1120 | jnz not_first_sector ; no. write empty sector |
||
1121 | mov esi,NewDirEntry1 |
||
1122 | mov edi,buffer |
||
1123 | mov ecx,64/4 |
||
1124 | cld |
||
1125 | rep movsd ; copy 2 first directory entrys "." and ".." |
||
1126 | |||
1127 | not_first_sector: |
||
1128 | call hd_write |
||
1129 | dec edx |
||
1130 | jnz dir_set_empty_directory |
||
1131 | |||
1132 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1133 | call add_disk_free_space |
||
1134 | |||
1135 | popad |
||
1136 | call update_disk ; write all of cache and fat to hd |
||
1137 | mov [hd1_status],0 |
||
1138 | xor eax,eax |
||
1139 | ret |
||
1140 | |||
1141 | |||
1142 | removedir: |
||
1143 | ;----------------------------------------------------- |
||
1144 | ; input : eax = file/directory name |
||
1145 | ; edx = path |
||
1146 | ; output : eax = 0 - ok |
||
1147 | ; 3 - unknown FS |
||
1148 | ; 5 - file not found |
||
1149 | ; 10 - access denied |
||
1150 | ;----------------------------------------------------- |
||
1151 | cmp [fat_type],0 |
||
1152 | jnz remove_dir_fat_ok |
||
1153 | mov eax,ERROR_UNKNOWN_FS |
||
1154 | ret |
||
1155 | |||
1156 | remove_dir_fat_ok: |
||
1157 | ; call reserve_hd1 |
||
1158 | |||
1159 | push edi |
||
1160 | mov edi,1 ; allow directory remove |
||
1161 | call file_delete |
||
1162 | pop edi |
||
1163 | |||
1164 | call update_disk ; write all of cache and fat to hd |
||
1165 | mov [hd1_status],0 |
||
1166 | ret |
||
1167 | |||
1168 | |||
1169 | add_disk_free_space: |
||
1170 | ;----------------------------------------------------- |
||
1171 | ; input : ecx = cluster count |
||
1172 | ; Note : negative = remove clusters from free space |
||
1173 | ; positive = add clusters to free space |
||
1174 | ;----------------------------------------------------- |
||
1175 | test ecx,ecx ; no change |
||
1176 | je add_dfs_no |
||
1177 | cmp [fat_type],32 ; free disk space only used by fat32 |
||
1178 | jne add_dfs_no |
||
1179 | |||
1180 | push eax ebx |
||
1181 | mov eax,[ADR_FSINFO] |
||
1182 | mov ebx,buffer |
||
1183 | call hd_read |
||
1184 | cmp dword [ebx+0x1fc],0xaa550000 ; check sector id |
||
1185 | jne add_not_fs |
||
1186 | |||
1187 | add [ebx+0x1e8],ecx |
||
1188 | call hd_write |
||
1189 | |||
1190 | add_not_fs: |
||
1191 | pop ebx eax |
||
1192 | |||
1193 | add_dfs_no: |
||
1194 | ret |
||
1195 | |||
1196 | |||
1197 | file_append: |
||
1198 | ;----------------------------------------------------- |
||
1199 | ; input : eax = file name |
||
1200 | ; edx = path |
||
1201 | ; ecx = pointer to buffer |
||
1202 | ; ebx = bytes to write (0 = truncate file) |
||
1203 | ; esi = start position (-1 = end of file) |
||
1204 | ; output : eax = 0 - ok |
||
1205 | ; 3 - unknown FS |
||
1206 | ; 5 - file not found |
||
1207 | ; 6 - end of file |
||
1208 | ; 8 - disk full |
||
1209 | ; 9 - fat table corrupted |
||
1210 | ; 10 - access denied |
||
1211 | ; ebx = bytes written |
||
1212 | ;----------------------------------------------------- |
||
1213 | cmp [fat_type],0 |
||
1214 | jnz append_fat_ok |
||
1215 | mov eax,ERROR_UNKNOWN_FS |
||
1216 | ret |
||
1217 | |||
1218 | append_fat_ok: |
||
1219 | ; call reserve_hd1 |
||
1220 | |||
1221 | pushad |
||
1222 | |||
1223 | mov ebx,edx |
||
1224 | call get_cluster_of_a_path |
||
1225 | jc append_not_found |
||
1226 | |||
1227 | mov ebx,PUSHAD_EAX ; file name |
||
1228 | call analyze_directory |
||
1229 | jc append_not_found |
||
1230 | |||
1231 | mov [sector_tmp],eax |
||
1232 | mov [entry_pos],ebx |
||
1233 | |||
1234 | test byte [ebx+11],0x10 ; is it directory? |
||
1235 | jnz append_access ; yes |
||
1236 | |||
1237 | mov ecx,[ebx+28] ; file size |
||
1238 | mov edi,PUSHAD_ESI ; write position |
||
1239 | cmp edi,-1 ; -1 = eof |
||
1240 | jnz append_inside_file |
||
1241 | mov edi,ecx ; file size |
||
1242 | |||
1243 | append_inside_file: |
||
1244 | cmp edi,ecx ; start above old file size? |
||
1245 | ja append_eof ; yes |
||
1246 | |||
1247 | mov [old_filesize],ecx |
||
1248 | mov [new_filepos],edi |
||
1249 | |||
1250 | mov ecx,PUSHAD_EBX ; bytes to write |
||
1251 | test ecx,ecx ; truncate? |
||
1252 | jz append_truncate ; yes |
||
1253 | |||
1254 | mov [bytes2write],ecx ; bytes to write |
||
1255 | mov esi,PUSHAD_ECX ; pointer to buffer |
||
1256 | mov eax,[ebx+20-2] ; FAT entry |
||
1257 | mov ax,[ebx+26] |
||
1258 | and eax,[fatMASK] |
||
1259 | jnz append_find_pos ; first cluster <> 0 |
||
1260 | |||
1261 | mov eax,2 |
||
1262 | call get_free_FAT |
||
1263 | jc append_disk_full |
||
1264 | mov ecx,eax ; set files first cluster |
||
1265 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1266 | shr ecx,16 |
||
1267 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1268 | mov edx,[fatEND] ; new end for cluster chain |
||
1269 | call set_FAT |
||
1270 | |||
1271 | push eax ; save first cluster |
||
1272 | mov eax,[sector_tmp] |
||
1273 | mov ebx,buffer |
||
1274 | call hd_write ; write new file entry back to disk |
||
1275 | pop eax |
||
1276 | |||
1277 | append_remove_free: |
||
1278 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1279 | call add_disk_free_space ; Note: uses buffer |
||
1280 | |||
1281 | append_found_cluster: |
||
1282 | mov [cluster],eax |
||
1283 | sub eax,2 |
||
1284 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1285 | imul eax,ecx |
||
1286 | add eax,[DATA_START] |
||
1287 | xor edi,edi |
||
1288 | |||
1289 | append_new_sector: |
||
1290 | push ecx |
||
1291 | mov ecx,[bytes2write] ; bytes left in buffer |
||
1292 | mov ebx,512 |
||
1293 | sub ebx,edi ; bytes left in sector |
||
1294 | cmp ecx,ebx |
||
1295 | jb append_bytes_ok |
||
1296 | mov ecx,ebx |
||
1297 | |||
1298 | append_bytes_ok: |
||
1299 | cmp ecx,512 ; overwrite full sector? |
||
1300 | jz append_full_sector ; yes |
||
1301 | mov ebx,buffer ; overwrite part of sector |
||
1302 | call hd_read ; read old sector |
||
1303 | |||
1304 | append_full_sector: |
||
1305 | sub [bytes2write],ecx |
||
1306 | add [new_filepos],ecx |
||
1307 | add edi,buffer |
||
1308 | cld |
||
1309 | rep movsb |
||
1310 | pop ecx |
||
1311 | |||
1312 | mov ebx,buffer |
||
1313 | call hd_write |
||
1314 | cmp [bytes2write],0 ; is all done? |
||
1315 | jz append_done |
||
1316 | xor edi,edi |
||
1317 | inc eax |
||
1318 | dec ecx |
||
1319 | jnz append_new_sector |
||
1320 | |||
1321 | mov eax,[cluster] |
||
1322 | call get_FAT |
||
1323 | cmp eax,2 |
||
1324 | jb append_fat |
||
1325 | cmp eax,[LAST_CLUSTER] |
||
1326 | jbe append_found_cluster |
||
1327 | |||
1328 | append_alloc_cluster: |
||
1329 | mov eax,2 ; ToDo: use temp array to keep track |
||
1330 | call get_free_FAT ; of last free cluster |
||
1331 | jc append_disk_full |
||
1332 | push eax ; save new cluster |
||
1333 | mov edx,[fatEND] ; new end for cluster chain |
||
1334 | call set_FAT |
||
1335 | mov edx,eax |
||
1336 | mov eax,[cluster] |
||
1337 | mov [f_del],1 |
||
1338 | call set_FAT ; update previous cluster |
||
1339 | mov [f_del],0 |
||
1340 | pop eax |
||
1341 | jmp append_remove_free |
||
1342 | |||
1343 | append_find_pos: |
||
1344 | call find_filepos |
||
1345 | mov [cluster],ebx |
||
1346 | jnc append_new_sector |
||
1347 | test edi,edi |
||
1348 | jz append_alloc_cluster |
||
1349 | |||
1350 | append_fat: |
||
1351 | mov eax,ERROR_FAT_TABLE |
||
1352 | jmp append_ret_code |
||
1353 | |||
1354 | append_disk_full: |
||
1355 | mov eax,ERROR_DISK_FULL |
||
1356 | jmp append_ret_code |
||
1357 | |||
1358 | append_done: |
||
1359 | xor eax,eax |
||
1360 | |||
1361 | append_ret_code: |
||
1362 | mov PUSHAD_EAX,eax ; return code |
||
1363 | |||
1364 | mov eax,[sector_tmp] ; update directory entry |
||
1365 | mov ebx,buffer |
||
1366 | call hd_read |
||
1367 | mov ebx,[entry_pos] |
||
1368 | mov ecx,[new_filepos] |
||
1369 | cmp ecx,[old_filesize] ; is file pos above old size? |
||
1370 | jbe append_size_ok ; no |
||
1371 | mov [ebx+28],ecx ; new file size |
||
1372 | |||
1373 | append_size_ok: |
||
1374 | call set_current_time_for_entry |
||
1375 | mov ebx,buffer |
||
1376 | call hd_write ; write new file entry back to disk |
||
1377 | |||
1378 | sub ecx,PUSHAD_ESI ; start position |
||
1379 | mov PUSHAD_EBX,ecx ; bytes written |
||
1380 | popad |
||
1381 | call update_disk ; write all of cache and fat to hd |
||
1382 | mov [hd1_status],0 |
||
1383 | ret |
||
1384 | |||
1385 | append_eof: |
||
1386 | popad |
||
1387 | mov [hd1_status],0 |
||
1388 | xor ebx,ebx |
||
1389 | mov eax,ERROR_END_OF_FILE |
||
1390 | ret |
||
1391 | |||
1392 | append_not_found: |
||
1393 | popad |
||
1394 | mov [hd1_status],0 |
||
1395 | xor ebx,ebx |
||
1396 | mov eax,ERROR_FILE_NOT_FOUND |
||
1397 | ret |
||
1398 | |||
1399 | append_access: |
||
1400 | popad |
||
1401 | mov [hd1_status],0 |
||
1402 | xor ebx,ebx |
||
1403 | mov eax,ERROR_ACCESS_DENIED |
||
1404 | ret |
||
1405 | |||
1406 | append_truncate: |
||
1407 | mov edx,[ebx+20-2] ; FAT entry |
||
1408 | mov dx,[ebx+26] |
||
1409 | and edx,[fatMASK] |
||
1410 | mov [ebx+28],edi ; set new file size |
||
1411 | test edi,edi ; 0 length file? |
||
1412 | jnz truncate_save_size ; no |
||
1413 | mov [ebx+20],di ; FAT entry = 0 |
||
1414 | mov [ebx+26],di |
||
1415 | |||
1416 | truncate_save_size: |
||
1417 | call set_current_time_for_entry |
||
1418 | mov ebx,buffer |
||
1419 | call hd_write |
||
1420 | mov eax,edx ; first cluster |
||
1421 | test edi,edi ; 0 length file? |
||
1422 | jz truncate_clear_chain |
||
1423 | |||
1424 | imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes |
||
1425 | |||
1426 | truncate_new_cluster: |
||
1427 | cmp eax,2 ; incorrect fat chain? |
||
1428 | jb truncate_eof ; yes |
||
1429 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1430 | jnb truncate_eof ; yes |
||
1431 | sub edi,esi |
||
1432 | jbe truncate_pos_found |
||
1433 | call get_FAT ; get next cluster |
||
1434 | jmp truncate_new_cluster |
||
1435 | |||
1436 | truncate_pos_found: |
||
1437 | mov edx,[fatEND] ; new end for cluster chain |
||
1438 | mov [f_del],1 |
||
1439 | call set_FAT |
||
1440 | mov [f_del],0 |
||
1441 | mov eax,edx ; clear rest of chain |
||
1442 | |||
1443 | truncate_clear_chain: |
||
1444 | call clear_cluster_chain |
||
1445 | |||
1446 | truncate_eof: |
||
1447 | popad |
||
1448 | call update_disk ; write all of cache and fat to hd |
||
1449 | mov [hd1_status],0 |
||
1450 | xor ebx,ebx |
||
1451 | xor eax,eax |
||
1452 | ret |
||
1453 | |||
1454 | |||
1455 | find_filepos: |
||
1456 | ;----------------------------------------------------- |
||
1457 | ; input : eax = first cluster |
||
1458 | ; edi = bytes to skip over (start position) |
||
1459 | ; output : if CARRY=0 file position found |
||
1460 | ; if CARRY=1 end of file found |
||
1461 | ; eax = current file sector |
||
1462 | ; ebx = last cluster |
||
1463 | ; ecx = sector count in last cluster |
||
1464 | ; edi = bytes to skip over (sector position) |
||
1465 | ;----------------------------------------------------- |
||
1466 | push esi |
||
1467 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1468 | imul esi,ecx,512 ; esi = cluster size in bytes |
||
1469 | mov ebx,eax |
||
1470 | |||
1471 | filepos_new_cluster: |
||
1472 | cmp eax,2 ; incorrect fat chain? |
||
1473 | jb filepos_eof ; yes |
||
1474 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1475 | jnb filepos_eof ; yes |
||
1476 | |||
1477 | mov ebx,eax |
||
1478 | cmp edi,esi ; skip over full cluster? |
||
1479 | jb filepos_cluster_ok ; no |
||
1480 | |||
1481 | sub edi,esi |
||
1482 | call get_FAT ; get next cluster |
||
1483 | jmp filepos_new_cluster |
||
1484 | |||
1485 | filepos_cluster_ok: |
||
1486 | sub eax,2 |
||
1487 | imul eax,ecx |
||
1488 | add eax,[DATA_START] |
||
1489 | |||
1490 | filepos_new_sector: |
||
1491 | cmp edi,512 ; skip over full sector? |
||
1492 | jb filepos_sector_ok ; no |
||
1493 | sub edi,512 |
||
1494 | inc eax |
||
1495 | dec ecx |
||
1496 | jnz filepos_new_sector |
||
1497 | |||
1498 | filepos_eof: |
||
1499 | pop esi |
||
1500 | stc |
||
1501 | ret |
||
1502 | |||
1503 | filepos_sector_ok: |
||
1504 | pop esi |
||
1505 | clc |
||
1506 | ret |
||
1507 | |||
1508 | |||
1509 | file_write: |
||
1510 | ;-------------------------------------------------------------------------- |
||
1511 | ; INPUT : user-reg register-in-this meaning symbol-in-this-routine |
||
1512 | ; |
||
1513 | ; EAX EDI system call to write / |
||
1514 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1515 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1516 | ; ECX EBX (PAR2) file size PAR2 |
||
1517 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1518 | ; |
||
1519 | ; output : eax = 0 - ok |
||
1520 | ; 3 - unknown FS |
||
1521 | ; 5 - file not found |
||
1522 | ; 8 - disk full |
||
1523 | ; 10 - access denied |
||
1524 | ;-------------------------------------------------------------------------- |
||
1525 | cmp [fat_type],0 |
||
1526 | jnz fat_ok_for_writing |
||
1527 | mov eax,ERROR_UNKNOWN_FS |
||
1528 | ret |
||
1529 | |||
1530 | fat_ok_for_writing: |
||
1531 | ; call reserve_hd1 |
||
1532 | |||
1533 | pushad |
||
1534 | |||
1535 | xor edi,edi ; don't allow directory remove |
||
1536 | call file_delete ; try to delete the file first |
||
1537 | test eax,eax |
||
1538 | jz old_deleted ; deleted ok |
||
1539 | cmp eax,ERROR_FILE_NOT_FOUND |
||
1540 | jnz exit_write_access ; it exist but can't delete |
||
1541 | |||
1542 | old_deleted: |
||
1543 | mov ebx,PUSHAD_EDX |
||
1544 | call get_cluster_of_a_path |
||
1545 | jnc found_directory_for_writing |
||
1546 | |||
1547 | exit_writing_with_error: |
||
1548 | popad |
||
1549 | call update_disk ; write all of cache and fat to hd |
||
1550 | mov [hd1_status],0 |
||
1551 | mov eax,ERROR_FILE_NOT_FOUND |
||
1552 | ret |
||
1553 | |||
1554 | exit_writing_disk_full_clear: |
||
1555 | mov eax,[sector_tmp] |
||
1556 | mov ebx,buffer |
||
1557 | call hd_read ; read directory sector |
||
1558 | mov edx,[entry_pos] |
||
1559 | mov byte [edx],0xe5 ; mark as deleted |
||
1560 | call hd_write |
||
1561 | mov eax,[edx+20-2] ; FAT entry |
||
1562 | mov ax,[edx+26] |
||
1563 | and eax,[fatMASK] |
||
1564 | call clear_cluster_chain |
||
1565 | |||
1566 | exit_writing_disk_full: |
||
1567 | popad |
||
1568 | call update_disk ; write all of cache and fat to hd |
||
1569 | mov [hd1_status],0 |
||
1570 | mov eax,ERROR_DISK_FULL |
||
1571 | ret |
||
1572 | |||
1573 | exit_write_access: |
||
1574 | popad |
||
1575 | call update_disk ; write all of cache and fat to hd |
||
1576 | mov [hd1_status],0 |
||
1577 | mov eax,ERROR_ACCESS_DENIED |
||
1578 | ret |
||
1579 | |||
1580 | found_directory_for_writing: |
||
1581 | call analyze_directory_to_write |
||
1582 | jc exit_writing_disk_full |
||
1583 | |||
1584 | mov [sector_tmp],eax |
||
1585 | mov [entry_pos],ebx |
||
1586 | push eax ; save directory sector |
||
1587 | mov eax,2 |
||
1588 | call get_free_FAT |
||
1589 | mov [cluster],eax ; first free cluster |
||
1590 | pop eax |
||
1591 | jc exit_writing_disk_full |
||
1592 | |||
1593 | mov esi,PUSHAD_EAX ; file name |
||
1594 | mov edi,ebx ; pointer in buffer |
||
1595 | mov ecx,11 |
||
1596 | cld |
||
1597 | rep movsb |
||
1598 | |||
1599 | mov esi,PUSHAD_EBX ; file size (bytes left) |
||
1600 | mov [ebx+28],esi ; file size |
||
1601 | mov ecx,[cluster] |
||
1602 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1603 | shr ecx,16 |
||
1604 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1605 | mov byte [ebx+11],0x20 ; attribute = archive |
||
1606 | |||
1607 | call set_current_time_for_entry |
||
1608 | |||
1609 | mov ebx,buffer ; save the directory name,length,cluster |
||
1610 | call hd_write |
||
1611 | |||
1612 | imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes |
||
1613 | xor ecx,ecx ; cluster count |
||
1614 | mov ebx,PUSHAD_ECX ; ebx = buffer |
||
1615 | |||
1616 | hd_new_block_write: |
||
1617 | |||
1618 | mov eax,[cluster] ; eax = block |
||
1619 | call set_data_cluster |
||
1620 | |||
1621 | sub esi,edi ; sub wrote bytes |
||
1622 | jbe file_saved_OK ; end if all done |
||
1623 | add ebx,edi ; update buffer position |
||
1624 | |||
1625 | inc eax |
||
1626 | call get_free_FAT ; next free in FAT |
||
1627 | jc exit_writing_disk_full_clear |
||
1628 | |||
1629 | mov edx,eax |
||
1630 | xchg eax,[cluster] ; get old cluster and save new cluster |
||
1631 | call set_FAT ; add it in cluster chain |
||
1632 | dec ecx ; update cluster count |
||
1633 | jmp hd_new_block_write |
||
1634 | |||
1635 | file_saved_OK: |
||
1636 | |||
1637 | mov edx,[fatEND] ; new end for cluster chain |
||
1638 | call set_FAT |
||
1639 | dec ecx ; update cluster count |
||
1640 | |||
1641 | call add_disk_free_space ; remove clusters from free disk space |
||
1642 | |||
1643 | popad |
||
1644 | call update_disk ; write all of cache and fat to hd |
||
1645 | mov [hd1_status],0 |
||
1646 | xor eax,eax |
||
1647 | ret |
||
1648 | |||
1649 | |||
1650 | file_read: |
||
1651 | ;-------------------------------------------------------------------------- |
||
1652 | ; INPUT : user-register register-in-this meaning symbol-in-this |
||
1653 | ; |
||
1654 | ; EAX EDI system call to write / |
||
1655 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1656 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1657 | ; ECX EBX (PAR2) vt file blocks to read PAR2 |
||
1658 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1659 | ; EDI ESI vt first 512 block to read |
||
1660 | ; EDI if 0 - read root |
||
1661 | ; |
||
1662 | ; output : eax = 0 - ok |
||
1663 | ; 3 - unknown FS |
||
1664 | ; 5 - file not found |
||
1665 | ; 6 - end of file |
||
1666 | ; 9 - fat table corrupted |
||
1667 | ; ebx = size of file/directory |
||
1668 | ;-------------------------------------------------------------------------- |
||
1669 | cmp [fat_type],0 |
||
1670 | jnz fat_ok_for_reading |
||
1671 | xor ebx,ebx |
||
1672 | mov eax,ERROR_UNKNOWN_FS |
||
1673 | ret |
||
1674 | |||
1675 | fat_ok_for_reading: |
||
1676 | ; call reserve_hd1 |
||
1677 | |||
1678 | pushad |
||
1679 | |||
1680 | mov ebx,edx |
||
1681 | call get_cluster_of_a_path |
||
1682 | jc file_to_read_not_found |
||
1683 | |||
1684 | test edi,edi ; read rootdir |
||
1685 | jne no_read_root |
||
1686 | |||
1687 | xor eax,eax |
||
1688 | call get_dir_size ; return rootdir size |
||
1689 | mov [file_size],eax |
||
1690 | mov eax,[ROOT_CLUSTER] |
||
1691 | jmp file_read_start |
||
1692 | |||
1693 | no_read_root: |
||
1694 | mov ebx,PUSHAD_EAX ; file name |
||
1695 | call analyze_directory |
||
1696 | jc file_to_read_not_found |
||
1697 | |||
1698 | mov eax,[ebx+28] ; file size |
||
1699 | test byte [ebx+11],0x10 ; is it directory? |
||
1700 | jz read_set_size ; no |
||
1701 | |||
1702 | mov eax,[ebx+20-2] ; FAT entry |
||
1703 | mov ax,[ebx+26] |
||
1704 | and eax,[fatMASK] |
||
1705 | call get_dir_size |
||
1706 | |||
1707 | read_set_size: |
||
1708 | mov [file_size],eax |
||
1709 | |||
1710 | mov eax,[ebx+20-2] ; FAT entry |
||
1711 | mov ax,[ebx+26] |
||
1712 | and eax,[fatMASK] |
||
1713 | |||
1714 | file_read_start: |
||
1715 | mov ebx,PUSHAD_ECX ; pointer to buffer |
||
1716 | mov edx,PUSHAD_EBX ; file blocks to read |
||
1717 | mov esi,PUSHAD_ESI ; first 512 block to read |
||
1718 | |||
1719 | file_read_new_cluster: |
||
1720 | call get_data_cluster |
||
1721 | jc file_read_eof ; end of file or cluster out of range |
||
1722 | |||
1723 | test edx,edx ; is all read? |
||
1724 | je file_read_OK ; yes |
||
1725 | |||
1726 | call get_FAT ; get next cluster |
||
1727 | cmp eax,[fatRESERVED] ; end of file |
||
1728 | jnb file_read_eof |
||
1729 | cmp eax,2 ; incorrect fat chain |
||
1730 | jnb file_read_new_cluster |
||
1731 | |||
1732 | popad |
||
1733 | mov [hd1_status],0 |
||
1734 | mov ebx,[file_size] |
||
1735 | mov eax,ERROR_FAT_TABLE |
||
1736 | ret |
||
1737 | |||
1738 | file_read_eof: |
||
1739 | popad |
||
1740 | mov [hd1_status],0 |
||
1741 | mov ebx,[file_size] |
||
1742 | mov eax,ERROR_END_OF_FILE |
||
1743 | ret |
||
1744 | |||
1745 | file_read_OK: |
||
1746 | popad |
||
1747 | mov [hd1_status],0 |
||
1748 | mov ebx,[file_size] |
||
1749 | xor eax,eax |
||
1750 | ret |
||
1751 | |||
1752 | file_to_read_not_found: |
||
1753 | popad |
||
1754 | mov [hd1_status],0 |
||
1755 | xor ebx,ebx |
||
1756 | mov eax,ERROR_FILE_NOT_FOUND |
||
1757 | ret |
||
1758 | |||
1759 | |||
1760 | get_dir_size: |
||
1761 | ;----------------------------------------------------- |
||
1762 | ; input : eax = first cluster (0=rootdir) |
||
1763 | ; output : eax = directory size in bytes |
||
1764 | ;----------------------------------------------------- |
||
1765 | push edx |
||
1766 | xor edx,edx ; count of directory clusters |
||
1767 | test eax,eax |
||
1768 | jnz dir_size_next |
||
1769 | |||
1770 | mov eax,[ROOT_SECTORS] |
||
1771 | shl eax,9 ; fat16 rootdir size in bytes |
||
1772 | cmp [fat_type],16 |
||
1773 | je dir_size_ret |
||
1774 | mov eax,[ROOT_CLUSTER] |
||
1775 | |||
1776 | dir_size_next: |
||
1777 | cmp eax,2 ; incorrect fat chain |
||
1778 | jb dir_size_end |
||
1779 | cmp eax,[fatRESERVED] ; end of directory |
||
1780 | ja dir_size_end |
||
1781 | call get_FAT ; get next cluster |
||
1782 | inc edx |
||
1783 | jmp dir_size_next |
||
1784 | |||
1785 | dir_size_end: |
||
1786 | imul eax,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
1787 | imul eax,edx |
||
1788 | |||
1789 | dir_size_ret: |
||
1790 | pop edx |
||
1791 | ret |
||
1792 | |||
1793 | |||
1794 | file_delete: |
||
1795 | ;----------------------------------------------------- |
||
1796 | ; input : eax = file/directory name |
||
1797 | ; edx = path |
||
1798 | ; edi = 1 - allow directory remove else don't remove directory |
||
1799 | ; output : eax = 0 - ok |
||
1800 | ; 3 - unknown FS |
||
1801 | ; 5 - file not found |
||
1802 | ; 10 - access denied |
||
1803 | ;----------------------------------------------------- |
||
1804 | cmp [fat_type],0 |
||
1805 | jnz file_del_fat_ok |
||
1806 | mov eax,ERROR_UNKNOWN_FS |
||
1807 | ret |
||
1808 | |||
1809 | file_del_fat_ok: |
||
1810 | pushad |
||
1811 | |||
1812 | mov ebx,edx |
||
1813 | call get_cluster_of_a_path |
||
1814 | jc file_to_delete_not_found |
||
1815 | |||
1816 | mov ebx,PUSHAD_EAX ; file/directory name |
||
1817 | call analyze_directory |
||
1818 | jc file_to_delete_not_found |
||
1819 | |||
1820 | test byte [ebx+11],0x10 ; is it directory? |
||
1821 | jz delete_notdir ; no. it's file |
||
1822 | cmp edi,1 ; allow directory remove |
||
1823 | jnz delete_no_access ; no |
||
1824 | |||
1825 | push eax ; save directory sector |
||
1826 | mov eax,[ebx+20-2] ; first cluster of file |
||
1827 | mov ax,[ebx+26] ; 0 length files start cluster = 0 |
||
1828 | and eax,[fatMASK] |
||
1829 | xor ebp,ebp ; counter for directory deepnes |
||
1830 | call clear_directory |
||
1831 | pop eax |
||
1832 | jc delete_no_access |
||
1833 | |||
1834 | push ebx ; save directory pointer in buffer |
||
1835 | mov ebx,buffer |
||
1836 | call hd_read ; read directory sector |
||
1837 | pop ebx |
||
1838 | |||
1839 | delete_notdir: |
||
1840 | call delete_entry_name |
||
1841 | mov eax,ecx ; first cluster of file |
||
1842 | call clear_cluster_chain |
||
1843 | popad |
||
1844 | xor eax,eax |
||
1845 | ret |
||
1846 | |||
1847 | delete_no_access: |
||
1848 | popad |
||
1849 | mov eax,ERROR_ACCESS_DENIED |
||
1850 | ret |
||
1851 | |||
1852 | file_to_delete_not_found: |
||
1853 | popad |
||
1854 | mov eax,ERROR_FILE_NOT_FOUND |
||
1855 | ret |
||
1856 | |||
1857 | |||
1858 | clear_cluster_chain: |
||
1859 | ;----------------------------------------------------- |
||
1860 | ; input : eax = first cluster |
||
1861 | ;----------------------------------------------------- |
||
1862 | push eax ecx edx |
||
1863 | xor ecx,ecx ; cluster count |
||
1864 | mov [f_del],1 ; delete on |
||
1865 | |||
1866 | clean_new_chain: |
||
1867 | cmp eax,[LAST_CLUSTER] ; end of file |
||
1868 | ja delete_OK |
||
1869 | cmp eax,2 ; unfinished fat chain or zero length file |
||
1870 | jb delete_OK |
||
1871 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1872 | jz delete_OK |
||
1873 | |||
1874 | xor edx,edx |
||
1875 | call set_FAT ; clear fat entry |
||
1876 | inc ecx ; update cluster count |
||
1877 | mov eax,edx ; old cluster |
||
1878 | jmp clean_new_chain |
||
1879 | |||
1880 | delete_OK: |
||
1881 | call add_disk_free_space ; add clusters to free disk space |
||
1882 | mov [f_del],0 |
||
1883 | pop edx ecx eax |
||
1884 | ret |
||
1885 | |||
1886 | |||
1887 | clear_directory: |
||
1888 | ;----------------------------------------------------- |
||
1889 | ; input : eax = directory cluster |
||
1890 | ; ebp = directory deepnes |
||
1891 | ; Note : use recursive call |
||
1892 | ;----------------------------------------------------- |
||
1893 | pushad |
||
1894 | inc ebp |
||
1895 | cmp ebp,64 ; if over 63 directory deep |
||
1896 | jnb clear_error ; something must be wrong |
||
1897 | |||
1898 | clear_new_cluster: |
||
1899 | cmp eax,[LAST_CLUSTER] |
||
1900 | ja clear_end |
||
1901 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1902 | jz clear_end |
||
1903 | mov esi,eax ; esi = current directory cluster |
||
1904 | sub eax,2 |
||
1905 | jb clear_end |
||
1906 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1907 | imul eax,ecx |
||
1908 | add eax,[DATA_START] |
||
1909 | |||
1910 | clear_new_sector: |
||
1911 | mov edi,eax ; edi = current directory sector |
||
1912 | mov ebx,deltree_buffer |
||
1913 | call hd_read |
||
1914 | mov edx,512/32 ; count of dir entrys per sector = 16 |
||
1915 | |||
1916 | clear_analyze: |
||
1917 | mov al,[ebx+11] ; file attribute |
||
1918 | and al,0xf |
||
1919 | cmp al,0xf |
||
1920 | je clear_long_filename |
||
1921 | |||
1922 | cmp byte [ebx],'.' ; parent or current directory |
||
1923 | je clear_next_entry |
||
1924 | cmp byte [ebx],0xe5 ; deleted |
||
1925 | je clear_next_entry |
||
1926 | cmp byte [ebx],0 ; empty |
||
1927 | je clear_write_last |
||
1928 | ;je clear_next_entry |
||
1929 | |||
1930 | mov eax,[ebx+20-2] ; first cluster of entry |
||
1931 | mov ax,[ebx+26] |
||
1932 | and eax,[fatMASK] |
||
1933 | |||
1934 | test byte [ebx+11],0x10 ; is it directory? |
||
1935 | jz clear_file ; no |
||
1936 | |||
1937 | push eax ebx |
||
1938 | mov eax,edi |
||
1939 | mov ebx,deltree_buffer ; save buffer over recursive call |
||
1940 | call hd_write ; write directory sector to disk |
||
1941 | pop ebx eax |
||
1942 | |||
1943 | call clear_directory ; recursive call !!! |
||
1944 | jc clear_error ; exit if error found |
||
1945 | |||
1946 | push eax ebx |
||
1947 | mov eax,edi |
||
1948 | mov ebx,deltree_buffer |
||
1949 | call hd_read ; read directory sector again |
||
1950 | pop ebx eax |
||
1951 | |||
1952 | clear_file: |
||
1953 | call clear_cluster_chain |
||
1954 | |||
1955 | clear_long_filename: |
||
1956 | mov byte [ebx],0xe5 |
||
1957 | |||
1958 | clear_next_entry: |
||
1959 | add ebx,32 ; position of next dir entry |
||
1960 | dec edx |
||
1961 | jnz clear_analyze |
||
1962 | |||
1963 | mov eax,edi |
||
1964 | mov ebx,deltree_buffer |
||
1965 | call hd_write ; write directory sector to disk |
||
1966 | |||
1967 | inc eax ; next sector |
||
1968 | dec ecx |
||
1969 | jnz clear_new_sector |
||
1970 | |||
1971 | mov eax,esi |
||
1972 | call get_FAT ; get next cluster |
||
1973 | jmp clear_new_cluster ; clear it |
||
1974 | |||
1975 | clear_write_last: |
||
1976 | mov eax,edi |
||
1977 | mov ebx,deltree_buffer |
||
1978 | call hd_write ; write directory sector to disk |
||
1979 | |||
1980 | clear_end: |
||
1981 | popad |
||
1982 | clc |
||
1983 | ret |
||
1984 | |||
1985 | clear_error: |
||
1986 | popad |
||
1987 | stc |
||
1988 | ret |
||
1989 | |||
1990 | |||
1991 | delete_entry_name: |
||
1992 | ;----------------------------------------------------- |
||
1993 | ; input : eax = directory sector |
||
1994 | ; ebx = directory pointer in buffer |
||
1995 | ; longname_sec = 2 previous directory sectors |
||
1996 | ; output : ecx = first cluster |
||
1997 | ; change : eax,ebx,edx |
||
1998 | ;----------------------------------------------------- |
||
1999 | mov byte [ebx],0xe5 |
||
2000 | mov ecx,[ebx+20-2] ; first cluster of file |
||
2001 | mov cx,[ebx+26] ; 0 length files start cluster = 0 |
||
2002 | and ecx,[fatMASK] |
||
2003 | |||
2004 | delete_empty: |
||
2005 | sub ebx,32 |
||
2006 | cmp ebx,buffer |
||
2007 | jnb delete_test_long |
||
2008 | |||
2009 | mov ebx,buffer |
||
2010 | call hd_write ; write directory sector back |
||
2011 | xor eax,eax |
||
2012 | xchg eax,[longname_sec2] |
||
2013 | xchg eax,[longname_sec1] |
||
2014 | test eax,eax ; is there previous directory sector? |
||
2015 | jz delete_name_end ; no |
||
2016 | |||
2017 | mov ebx,buffer |
||
2018 | call hd_read ; read previous sector |
||
2019 | mov ebx,buffer+0x1e0 ; start from last entry |
||
2020 | |||
2021 | delete_test_long: |
||
2022 | mov dh,[ebx+11] ; file attribute |
||
2023 | and dh,0xf |
||
2024 | cmp dh,0xf |
||
2025 | jne delete_write_buffer |
||
2026 | |||
2027 | cmp byte [ebx],0x40 ; end of long dir entry? |
||
2028 | mov byte [ebx],0xe5 |
||
2029 | jb delete_empty |
||
2030 | |||
2031 | delete_write_buffer: |
||
2032 | mov ebx,buffer |
||
2033 | call hd_write ; write directory sector back |
||
2034 | |||
2035 | delete_name_end: |
||
2036 | ret |
||
2037 | |||
2038 | |||
2039 | rename: |
||
2040 | ;----------------------------------------------------------- |
||
2041 | ; input : eax = source directory name |
||
2042 | ; edx = source path |
||
2043 | ; ebx = dest directory name |
||
2044 | ; edi = dest path |
||
2045 | ; output : eax = 0 - ok |
||
2046 | ; 3 - unknown FS |
||
2047 | ; 5 - file not found |
||
2048 | ; 8 - disk full |
||
2049 | ; 10 - access denied |
||
2050 | ;----------------------------------------------------------- |
||
2051 | cmp [fat_type],0 |
||
2052 | jnz fat_ok_for_rename |
||
2053 | mov eax,ERROR_UNKNOWN_FS |
||
2054 | ret |
||
2055 | |||
2056 | fat_ok_for_rename: |
||
2057 | ; call reserve_hd1 |
||
2058 | |||
2059 | pushad |
||
2060 | |||
2061 | mov ebx,edx ; source path |
||
2062 | call get_cluster_of_a_path |
||
2063 | jc rename_entry_not_found |
||
2064 | |||
2065 | mov ebx,PUSHAD_EAX ; source directory name |
||
2066 | call analyze_directory |
||
2067 | jc rename_entry_not_found |
||
2068 | |||
2069 | mov [sector_tmp],eax ; save source sector |
||
2070 | mov [entry_pos],ebx |
||
2071 | mov esi,ebx |
||
2072 | mov edi,dir_entry |
||
2073 | mov ecx,32/4 |
||
2074 | cld |
||
2075 | rep movsd ; save entry |
||
2076 | |||
2077 | mov ebx,PUSHAD_EDI ; dest path |
||
2078 | call get_cluster_of_a_path |
||
2079 | jc rename_entry_not_found |
||
2080 | |||
2081 | mov edx,eax ; save dest directory cluster |
||
2082 | mov ebx,PUSHAD_EBX ; dest directory name |
||
2083 | push [longname_sec1] |
||
2084 | push [longname_sec2] |
||
2085 | call analyze_directory ; check if entry already exist |
||
2086 | pop [longname_sec2] |
||
2087 | pop [longname_sec1] |
||
2088 | jnc rename_entry_already_exist |
||
2089 | |||
2090 | mov eax,edx |
||
2091 | call analyze_directory_to_write |
||
2092 | jc rename_disk_full |
||
2093 | |||
2094 | mov esi,dir_entry |
||
2095 | mov edi,ebx |
||
2096 | mov ecx,32/4 |
||
2097 | cld |
||
2098 | rep movsd ; copy entry |
||
2099 | mov esi,PUSHAD_EBX ; dest directory name |
||
2100 | mov edi,ebx |
||
2101 | mov ecx,11 |
||
2102 | rep movsb ; copy name |
||
2103 | |||
2104 | mov ebx,buffer ; save the directory name,length,cluster |
||
2105 | call hd_write |
||
2106 | |||
2107 | test byte [dir_entry+11],0x10 ; is it directory? |
||
2108 | jz rename_not_dir ; no |
||
2109 | mov eax,[dir_entry+20-2] ; FAT entry |
||
2110 | mov ax,[dir_entry+26] |
||
2111 | and eax,[fatMASK] |
||
2112 | call change_2dot_cluster |
||
2113 | |||
2114 | rename_not_dir: |
||
2115 | mov eax,[sector_tmp] |
||
2116 | mov ebx,buffer |
||
2117 | call hd_read ; read source directory sector |
||
2118 | |||
2119 | mov ebx,[entry_pos] |
||
2120 | call delete_entry_name |
||
2121 | |||
2122 | popad |
||
2123 | call update_disk ; write all of cache and fat to hd |
||
2124 | mov [hd1_status],0 |
||
2125 | xor eax,eax |
||
2126 | ret |
||
2127 | |||
2128 | rename_entry_not_found: |
||
2129 | popad |
||
2130 | mov [hd1_status],0 |
||
2131 | mov eax,ERROR_FILE_NOT_FOUND |
||
2132 | ret |
||
2133 | |||
2134 | rename_entry_already_exist: |
||
2135 | popad |
||
2136 | mov [hd1_status],0 |
||
2137 | mov eax,ERROR_ACCESS_DENIED |
||
2138 | ret |
||
2139 | |||
2140 | rename_disk_full: |
||
2141 | popad |
||
2142 | mov [hd1_status],0 |
||
2143 | mov eax,ERROR_DISK_FULL |
||
2144 | ret |
||
2145 | |||
2146 | |||
2147 | change_2dot_cluster: |
||
2148 | ;----------------------------------------------------------- |
||
2149 | ; input : eax = directory cluster |
||
2150 | ; edx = value to save |
||
2151 | ; change : eax,ebx,edx |
||
2152 | ;----------------------------------------------------------- |
||
2153 | cmp eax,[LAST_CLUSTER] |
||
2154 | ja not_2dot ; too big cluster number, something is wrong |
||
2155 | sub eax,2 |
||
2156 | jb not_2dot |
||
2157 | |||
2158 | imul eax,[SECTORS_PER_CLUSTER] |
||
2159 | add eax,[DATA_START] |
||
2160 | mov ebx,buffer |
||
2161 | call hd_read |
||
2162 | |||
2163 | cmp dword [ebx+32],'.. ' |
||
2164 | jnz not_2dot |
||
2165 | |||
2166 | cmp edx,[ROOT_CLUSTER] ; is rootdir cluster? |
||
2167 | jne not_2dot_root |
||
2168 | xor edx,edx ; yes. set it zero |
||
2169 | |||
2170 | not_2dot_root: |
||
2171 | mov [ebx+32+26],dx ; 16 bits low of cluster |
||
2172 | shr edx,16 |
||
2173 | mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16) |
||
2174 | call hd_write |
||
2175 | |||
2176 | not_2dot: |
||
2177 | ret |
||
2178 | |||
2179 | |||
2180 | get_filesize: |
||
2181 | ;----------------------------------------------------------- |
||
2182 | ; input : eax = file name |
||
2183 | ; edx = path |
||
2184 | ; edi = if 0 - read rootdir else normal dir/file size |
||
2185 | ; output : eax = 0 - ok |
||
2186 | ; 3 - unknown FS |
||
2187 | ; 5 - file not found |
||
2188 | ; ebx = file size |
||
2189 | ;----------------------------------------------------------- |
||
2190 | cmp [fat_type],0 |
||
2191 | jnz get_filesize_fat_ok |
||
2192 | xor ebx,ebx |
||
2193 | mov eax,ERROR_UNKNOWN_FS |
||
2194 | ret |
||
2195 | |||
2196 | get_filesize_fat_ok: |
||
2197 | ; call reserve_hd1 |
||
2198 | |||
2199 | pushad |
||
2200 | xor eax,eax |
||
2201 | test edi,edi ; is read rootdir? |
||
2202 | je get_filesize_dirsize ; yes |
||
2203 | |||
2204 | get_filesize_no_root: |
||
2205 | mov ebx,edx |
||
2206 | call get_cluster_of_a_path |
||
2207 | jc get_filesize_not_found |
||
2208 | |||
2209 | mov ebx,PUSHAD_EAX ; file name |
||
2210 | call analyze_directory |
||
2211 | jc get_filesize_not_found |
||
2212 | |||
2213 | mov eax,[ebx+28] ; file size |
||
2214 | test byte [ebx+11],0x10 ; is it directory? |
||
2215 | jz get_filesize_set_size ; no |
||
2216 | |||
2217 | mov eax,[ebx+20-2] ; FAT entry |
||
2218 | mov ax,[ebx+26] |
||
2219 | and eax,[fatMASK] |
||
2220 | |||
2221 | get_filesize_dirsize: |
||
2222 | call get_dir_size |
||
2223 | |||
2224 | get_filesize_set_size: |
||
2225 | mov PUSHAD_EBX,eax |
||
2226 | popad |
||
2227 | mov [hd1_status],0 |
||
2228 | xor eax,eax |
||
2229 | ret |
||
2230 | |||
2231 | get_filesize_not_found: |
||
2232 | popad |
||
2233 | mov [hd1_status],0 |
||
2234 | xor ebx,ebx |
||
2235 | mov eax,ERROR_FILE_NOT_FOUND |
||
2236 | ret |
||
2237 | |||
2238 | |||
2239 | get_fileattr: |
||
2240 | ;----------------------------------------------------------- |
||
2241 | ; input : eax = file name |
||
2242 | ; edx = path |
||
2243 | ; output : eax = 0 - ok |
||
2244 | ; 3 - unknown FS |
||
2245 | ; 5 - file not found |
||
2246 | ; ebx = file attribute |
||
2247 | ;----------------------------------------------------------- |
||
2248 | cmp [fat_type],0 |
||
2249 | jnz get_fileattr_fat_ok |
||
2250 | xor ebx,ebx |
||
2251 | mov eax,ERROR_UNKNOWN_FS |
||
2252 | ret |
||
2253 | |||
2254 | get_fileattr_fat_ok: |
||
2255 | ; call reserve_hd1 |
||
2256 | |||
2257 | pushad |
||
2258 | mov ebx,edx |
||
2259 | call get_cluster_of_a_path |
||
2260 | jc get_fileattr_not_found |
||
2261 | |||
2262 | mov ebx,PUSHAD_EAX ; file name |
||
2263 | call analyze_directory |
||
2264 | jc get_fileattr_not_found |
||
2265 | |||
2266 | movzx eax,byte [ebx+11] ; file attribute |
||
2267 | mov PUSHAD_EBX,eax |
||
2268 | popad |
||
2269 | mov [hd1_status],0 |
||
2270 | xor eax,eax |
||
2271 | ret |
||
2272 | |||
2273 | get_fileattr_not_found: |
||
2274 | popad |
||
2275 | mov [hd1_status],0 |
||
2276 | xor ebx,ebx |
||
2277 | mov eax,ERROR_FILE_NOT_FOUND |
||
2278 | ret |
||
2279 | |||
2280 | |||
2281 | get_filedate: |
||
2282 | ;----------------------------------------------------------- |
||
2283 | ; input : eax = file name |
||
2284 | ; edx = path |
||
2285 | ; output : eax = 0 - ok |
||
2286 | ; 3 - unknown FS |
||
2287 | ; 5 - file not found |
||
2288 | ; ebx = file date/time |
||
2289 | ; bits 31..25 = year-1980 |
||
2290 | ; bits 24..21 = month |
||
2291 | ; bits 20..16 = day |
||
2292 | ; bits 15..11 = hour |
||
2293 | ; bits 10..5 = minute |
||
2294 | ; bits 4..0 = second/2 |
||
2295 | ;----------------------------------------------------------- |
||
2296 | cmp [fat_type],0 |
||
2297 | jnz get_filedate_fat_ok |
||
2298 | xor ebx,ebx |
||
2299 | mov eax,ERROR_UNKNOWN_FS |
||
2300 | ret |
||
2301 | |||
2302 | get_filedate_fat_ok: |
||
2303 | ; call reserve_hd1 |
||
2304 | |||
2305 | pushad |
||
2306 | mov ebx,edx |
||
2307 | call get_cluster_of_a_path |
||
2308 | jc get_filedate_not_found |
||
2309 | |||
2310 | mov ebx,PUSHAD_EAX ; file name |
||
2311 | call analyze_directory |
||
2312 | jc get_filedate_not_found |
||
2313 | |||
2314 | mov eax,[ebx+22] ; file date/time |
||
2315 | mov PUSHAD_EBX,eax |
||
2316 | popad |
||
2317 | mov [hd1_status],0 |
||
2318 | xor eax,eax |
||
2319 | ret |
||
2320 | |||
2321 | get_filedate_not_found: |
||
2322 | popad |
||
2323 | mov [hd1_status],0 |
||
2324 | xor ebx,ebx |
||
2325 | mov eax,ERROR_FILE_NOT_FOUND |
||
2326 | ret |
||
2327 | |||
2328 | |||
2329 | get_hd_info: |
||
2330 | ;----------------------------------------------------------- |
||
2331 | ; output : eax = 0 - ok |
||
2332 | ; 3 - unknown FS |
||
2333 | ; edx = cluster size in bytes |
||
2334 | ; ebx = total clusters on disk |
||
2335 | ; ecx = free clusters on disk |
||
2336 | ;----------------------------------------------------------- |
||
2337 | cmp [fat_type],0 |
||
2338 | jnz info_fat_ok |
||
2339 | xor edx,edx |
||
2340 | xor ebx,ebx |
||
2341 | xor ecx,ecx |
||
2342 | mov eax,ERROR_UNKNOWN_FS |
||
2343 | ret |
||
2344 | |||
2345 | info_fat_ok: |
||
2346 | ; call reserve_hd1 |
||
2347 | |||
2348 | xor ecx,ecx ; count of free clusters |
||
2349 | mov eax,2 |
||
2350 | mov ebx,[LAST_CLUSTER] |
||
2351 | |||
2352 | info_cluster: |
||
2353 | push eax |
||
2354 | call get_FAT ; get cluster info |
||
2355 | test eax,eax ; is it free? |
||
2356 | jnz info_used ; no |
||
2357 | inc ecx |
||
2358 | |||
2359 | info_used: |
||
2360 | pop eax |
||
2361 | inc eax |
||
2362 | cmp eax,ebx ; is above last cluster? |
||
2363 | jbe info_cluster ; no. test next cluster |
||
2364 | |||
2365 | dec ebx ; cluster count |
||
2366 | imul edx,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
2367 | mov [hd1_status],0 |
||
2368 | xor eax,eax |
||
2369 | ret |
||
2370 | |||
2371 | |||
2372 | update_disk: |
||
2373 | ;----------------------------------------------------------- |
||
2374 | ; write changed fat and cache to disk |
||
2375 | ;----------------------------------------------------------- |
||
2376 | cmp [fat_change],0 ; is fat changed? |
||
2377 | je upd_no_change |
||
2378 | |||
2379 | call write_fat_sector |
||
2380 | |||
2381 | upd_no_change: |
||
2382 | |||
2383 | call write_cache |
||
2384 | ret |
||
2385 | |||
2386 | |||
2387 | ;************************************************************************** |
||
2388 | ; |
||
2389 | ; 0x600008 - first entry in cache list |
||
2390 | ; |
||
2391 | ; +0 - lba sector |
||
2392 | ; +4 - state of cache sector |
||
2393 | ; 0 = empty |
||
2394 | ; 1 = used for read ( same as in hd ) |
||
2395 | ; 2 = used for write ( differs from hd ) |
||
2396 | ; |
||
2397 | ; +65536 - cache entries |
||
2398 | ; |
||
2399 | ;************************************************************************** |
||
2400 | |||
2401 | |||
2402 | hd_read: |
||
2403 | ;----------------------------------------------------------- |
||
2404 | ; input : eax = block to read |
||
2405 | ; ebx = destination |
||
2406 | ;----------------------------------------------------------- |
||
2407 | push ecx esi edi ; scan cache |
||
2408 | |||
2409 | mov ecx,cache_max ; entries in cache |
||
2410 | mov esi,0x600000+8 |
||
2411 | mov edi,1 |
||
2412 | |||
2413 | hdreadcache: |
||
2414 | |||
2415 | cmp dword [esi+4],0 ; empty |
||
2416 | je nohdcache |
||
2417 | |||
2418 | cmp [esi],eax ; correct sector |
||
2419 | je yeshdcache |
||
2420 | |||
2421 | nohdcache: |
||
2422 | |||
2423 | add esi,8 |
||
2424 | inc edi |
||
2425 | dec ecx |
||
2426 | jnz hdreadcache |
||
2427 | |||
2428 | call find_empty_slot ; ret in edi |
||
2429 | |||
2430 | call wait_for_hd_idle |
||
2431 | push eax edx |
||
2432 | |||
2433 | cli |
||
2434 | xor eax,eax |
||
2435 | mov edx,[hdbase] |
||
2436 | inc edx |
||
2437 | out dx,al ; ATAFeatures ðåãèñòð "îñîáåííîñòåé" |
||
2438 | inc edx |
||
2439 | inc eax |
||
2440 | out dx,al ; ATASectorCount ñ÷åò÷èê ñåêòîðîâ |
||
2441 | inc edx |
||
2442 | mov eax,[esp+4] |
||
2443 | out dx,al ; ATASectorNumber ðåãèñòð íîìåðà ñåêòîðà |
||
2444 | shr eax,8 |
||
2445 | inc edx |
||
2446 | out dx,al ; ATACylinder íîìåð öèëèíäðà (ìëàäøèé áàéò) |
||
2447 | shr eax,8 |
||
2448 | inc edx |
||
2449 | out dx,al ; íîìåð öèëèíäðà (ñòàðøèé áàéò) |
||
2450 | shr eax,8 |
||
2451 | inc edx |
||
2452 | and al,1+2+4+8 |
||
2453 | add al,byte [hdid] |
||
2454 | add al,128+64+32 |
||
2455 | out dx,al ; íîìåð ãîëîâêè/íîìåð äèñêà |
||
2456 | inc edx |
||
2457 | mov al,20h |
||
2458 | out dx,al ; ATACommand ðåãèñòð êîìàíä |
||
2459 | sti |
||
2460 | |||
2461 | call wait_for_sector_buffer |
||
2462 | |||
2463 | cmp [hd_error],0 |
||
2464 | jne hd_read_error |
||
2465 | |||
2466 | cli |
||
2467 | push edi |
||
2468 | shl edi,9 |
||
2469 | add edi,0x600000+65536 |
||
2470 | mov ecx,256 |
||
2471 | mov edx,[hdbase] |
||
2472 | cld |
||
2473 | rep insw |
||
2474 | pop edi |
||
2475 | sti |
||
2476 | |||
2477 | pop edx eax |
||
2478 | blok_read_2: |
||
2479 | lea esi,[edi*8+0x600000] |
||
2480 | mov [esi],eax ; sector number |
||
2481 | mov dword [esi+4],1 ; hd read - mark as same as in hd |
||
2482 | |||
2483 | yeshdcache: |
||
2484 | |||
2485 | mov esi,edi |
||
2486 | shl esi,9 |
||
2487 | add esi,0x600000+65536 |
||
2488 | mov edi,ebx |
||
2489 | mov ecx,512/4 |
||
2490 | cld |
||
2491 | rep movsd ; move data |
||
2492 | ; blok_read_2: |
||
2493 | pop edi esi ecx |
||
2494 | ret |
||
2495 | |||
2496 | |||
2497 | hd_write: |
||
2498 | ;----------------------------------------------------------- |
||
2499 | ; input : eax = block |
||
2500 | ; ebx = pointer to memory |
||
2501 | ;----------------------------------------------------------- |
||
2502 | push ecx esi edi |
||
2503 | |||
2504 | ; check if the cache already has the sector and overwrite it |
||
2505 | |||
2506 | mov ecx,cache_max |
||
2507 | mov esi,0x600000+8 |
||
2508 | mov edi,1 |
||
2509 | |||
2510 | hdwritecache: |
||
2511 | |||
2512 | cmp dword [esi+4],0 ; if cache slot is empty |
||
2513 | je not_in_cache_write |
||
2514 | |||
2515 | cmp [esi],eax ; if the slot has the sector |
||
2516 | je yes_in_cache_write |
||
2517 | |||
2518 | not_in_cache_write: |
||
2519 | |||
2520 | add esi,8 |
||
2521 | inc edi |
||
2522 | dec ecx |
||
2523 | jnz hdwritecache |
||
2524 | |||
2525 | ; sector not found in cache |
||
2526 | ; write the block to a new location |
||
2527 | |||
2528 | call find_empty_slot ; ret in edi |
||
2529 | |||
2530 | lea esi,[edi*8+0x600000] |
||
2531 | mov [esi],eax ; sector number |
||
2532 | |||
2533 | yes_in_cache_write: |
||
2534 | |||
2535 | mov dword [esi+4],2 ; write - differs from hd |
||
2536 | |||
2537 | shl edi,9 |
||
2538 | add edi,0x600000+65536 |
||
2539 | mov esi,ebx |
||
2540 | mov ecx,512/4 |
||
2541 | cld |
||
2542 | rep movsd ; move data |
||
2543 | |||
2544 | pop edi esi ecx |
||
2545 | ret |
||
2546 | |||
2547 | |||
2548 | write_cache: |
||
2549 | ;----------------------------------------------------------- |
||
2550 | ; write all changed sectors to disk |
||
2551 | ;----------------------------------------------------------- |
||
2552 | push eax ecx edx esi edi |
||
2553 | |||
2554 | ; write difference ( 2 ) from cache to hd |
||
2555 | |||
2556 | mov ecx,cache_max |
||
2557 | mov esi,0x600000+8 |
||
2558 | mov edi,1 |
||
2559 | |||
2560 | write_cache_more: |
||
2561 | |||
2562 | cmp dword [esi+4],2 ; if cache slot is not different |
||
2563 | jne does_not_need_writing |
||
2564 | |||
2565 | mov dword [esi+4],1 ; same as in hd |
||
2566 | mov eax,[esi] ; eax = sector to write |
||
2567 | |||
2568 | cmp eax,[PARTITION_START] |
||
2569 | jb danger |
||
2570 | cmp eax,[PARTITION_END] |
||
2571 | ja danger |
||
2572 | |||
2573 | call wait_for_hd_idle |
||
2574 | |||
2575 | cli |
||
2576 | xor eax,eax |
||
2577 | mov edx,[hdbase] |
||
2578 | inc edx |
||
2579 | out dx,al |
||
2580 | inc edx |
||
2581 | inc eax |
||
2582 | out dx,al |
||
2583 | inc edx |
||
2584 | mov eax,[esi] ; eax = sector to write |
||
2585 | out dx,al |
||
2586 | shr eax,8 |
||
2587 | inc edx |
||
2588 | out dx,al |
||
2589 | shr eax,8 |
||
2590 | inc edx |
||
2591 | out dx,al |
||
2592 | shr eax,8 |
||
2593 | inc edx |
||
2594 | and al,1+2+4+8 |
||
2595 | add al,byte [hdid] |
||
2596 | add al,128+64+32 |
||
2597 | out dx,al |
||
2598 | inc edx |
||
2599 | mov al,30h |
||
2600 | out dx,al |
||
2601 | sti |
||
2602 | |||
2603 | call wait_for_sector_buffer |
||
2604 | |||
2605 | cmp [hd_error],0 |
||
2606 | jne hd_write_error |
||
2607 | |||
2608 | push ecx esi |
||
2609 | |||
2610 | cli |
||
2611 | mov esi,edi |
||
2612 | shl esi,9 |
||
2613 | add esi,0x600000+65536 ; esi = from memory position |
||
2614 | mov ecx,256 |
||
2615 | mov edx,[hdbase] |
||
2616 | cld |
||
2617 | rep outsw |
||
2618 | sti |
||
2619 | |||
2620 | pop esi ecx |
||
2621 | |||
2622 | danger: |
||
2623 | does_not_need_writing: |
||
2624 | |||
2625 | add esi,8 |
||
2626 | inc edi |
||
2627 | dec ecx |
||
2628 | jnz write_cache_more |
||
2629 | |||
2630 | pop edi esi edx ecx eax |
||
2631 | ret |
||
2632 | |||
2633 | |||
2634 | find_empty_slot: |
||
2635 | ;----------------------------------------------------------- |
||
2636 | ; find empty or read slot, flush cache if next 10% is used by write |
||
2637 | ; output : edi = cache slot |
||
2638 | ;----------------------------------------------------------- |
||
2639 | push ecx esi |
||
2640 | |||
2641 | search_again: |
||
2642 | |||
2643 | mov ecx,cache_max*10/100 |
||
2644 | mov edi,[cache_search_start] |
||
2645 | |||
2646 | search_for_empty: |
||
2647 | |||
2648 | inc edi |
||
2649 | cmp edi,cache_max |
||
2650 | jbe inside_cache |
||
2651 | mov edi,1 |
||
2652 | |||
2653 | inside_cache: |
||
2654 | |||
2655 | cmp dword [edi*8+0x600000+4],2 ; get cache slot info |
||
2656 | jb found_slot ; it's empty or read |
||
2657 | dec ecx |
||
2658 | jnz search_for_empty |
||
2659 | |||
2660 | call write_cache ; no empty slots found, write all |
||
2661 | jmp search_again ; and start again |
||
2662 | |||
2663 | found_slot: |
||
2664 | |||
2665 | mov [cache_search_start],edi |
||
2666 | |||
2667 | pop esi ecx |
||
2668 | ret |
||
2669 | |||
2670 | |||
2671 | save_hd_wait_timeout: |
||
2672 | |||
2673 | push eax |
||
2674 | mov eax,[timer_ticks];[0xfdf0] |
||
2675 | add eax,300 ; 3 sec timeout |
||
2676 | mov [hd_wait_timeout],eax |
||
2677 | pop eax |
||
2678 | ret |
||
2679 | |||
2680 | |||
2681 | check_hd_wait_timeout: |
||
2682 | |||
2683 | push eax |
||
2684 | mov eax,[hd_wait_timeout] |
||
2685 | cmp [timer_ticks], eax ;[0xfdf0],eax |
||
2686 | jg hd_timeout_error |
||
2687 | pop eax |
||
2688 | ret |
||
2689 | |||
2690 | iglobal |
||
2691 | hd_timeout_str db 'K : FS - HD timeout',13,10,0 |
||
2692 | hd_read_str db 'K : FS - HD read error',13,10,0 |
||
2693 | hd_write_str db 'K : FS - HD write error',13,10,0 |
||
2694 | endg |
||
2695 | |||
2696 | hd_timeout_error: |
||
2697 | |||
2698 | call clear_hd_cache |
||
2699 | call clear_application_table_status |
||
2700 | mov esi,hd_timeout_str |
||
2701 | call sys_msg_board_str |
||
2702 | jmp $ |
||
2703 | |||
2704 | |||
2705 | hd_read_error: |
||
2706 | |||
2707 | call clear_hd_cache |
||
2708 | call clear_application_table_status |
||
2709 | mov esi,hd_read_str |
||
2710 | call sys_msg_board_str |
||
2711 | jmp $ |
||
2712 | |||
2713 | hd_write_error: |
||
2714 | |||
2715 | call clear_hd_cache |
||
2716 | call clear_application_table_status |
||
2717 | mov esi,hd_write_str |
||
2718 | call sys_msg_board_str |
||
2719 | jmp $ |
||
2720 | |||
2721 | |||
2722 | |||
2723 | |||
2724 | wait_for_hd_idle: |
||
2725 | |||
2726 | push eax edx |
||
2727 | |||
2728 | call save_hd_wait_timeout |
||
2729 | |||
2730 | mov edx,[hdbase] |
||
2731 | add edx,0x7 |
||
2732 | |||
2733 | wfhil1: |
||
2734 | |||
2735 | call check_hd_wait_timeout |
||
2736 | |||
2737 | in al,dx |
||
2738 | test al,128 |
||
2739 | jnz wfhil1 |
||
2740 | |||
2741 | pop edx eax |
||
2742 | ret |
||
2743 | |||
2744 | |||
2745 | wait_for_sector_buffer: |
||
2746 | |||
2747 | push eax edx |
||
2748 | |||
2749 | mov edx,[hdbase] |
||
2750 | add edx,0x7 |
||
2751 | |||
2752 | call save_hd_wait_timeout |
||
2753 | |||
2754 | hdwait_sbuf: ; wait for sector buffer to be ready |
||
2755 | |||
2756 | call check_hd_wait_timeout |
||
2757 | |||
2758 | in al,dx |
||
2759 | test al,8 |
||
2760 | jz hdwait_sbuf |
||
2761 | |||
2762 | mov [hd_error],0 |
||
2763 | |||
2764 | cmp [hd_setup],1 ; do not mark error for setup request |
||
2765 | je buf_wait_ok |
||
2766 | |||
2767 | test al,1 ; previous command ended up with an error |
||
2768 | jz buf_wait_ok |
||
2769 | mov [hd_error],1 |
||
2770 | |||
2771 | buf_wait_ok: |
||
2772 | |||
2773 | pop edx eax |
||
2774 | ret |
||
2775 | |||
2776 | |||
2777 | |||
2778 | read_hd_file: |
||
2779 | ;----------------------------------------------------------------- |
||
2780 | ; |
||
2781 | ; Converting old reading function for hd-application start. |
||
2782 | ; |
||
2783 | ; IN: |
||
2784 | ; |
||
2785 | ; eax - pointer to file (0 = read only first sector of drive: eg 'label') |
||
2786 | ; ebx - file lenght |
||
2787 | ; ecx - start 512 byte block number |
||
2788 | ; edx - number of blocks to read |
||
2789 | ; esi - pointer to return/work area (atleast 20 000 bytes) |
||
2790 | ; |
||
2791 | ; For new read function |
||
2792 | ; |
||
2793 | ; EAX (PAR0) pointer to file-name |
||
2794 | ; ECX (PAR1) pointer to buffer |
||
2795 | ; EBX (PAR2) vt file blocks to read |
||
2796 | ; EDX (PAR3) pointer to path |
||
2797 | ; ESI vt first 512 block to read |
||
2798 | ; EDI if 0 - return root |
||
2799 | ;-------------------------------------------------------------------------- |
||
2800 | |||
2801 | push ecx esi edi |
||
2802 | mov esi,eax |
||
2803 | mov edi,startpath |
||
2804 | mov ecx,250 |
||
2805 | cld |
||
2806 | rep movsb |
||
2807 | pop edi esi ecx |
||
2808 | |||
2809 | mov eax,startpath |
||
2810 | mov [eax+ebx-12],byte 0 |
||
2811 | |||
2812 | push eax ebx ecx edx esi |
||
2813 | |||
2814 | pop ecx ; pointer to buffer |
||
2815 | add ecx,1024 |
||
2816 | pop ebx ; number of blocks to read |
||
2817 | pop esi ; first block to read |
||
2818 | dec esi |
||
2819 | pop eax ; file length |
||
2820 | pop edx ; pointer to path |
||
2821 | |||
2822 | mov edi,12 |
||
2823 | lea eax,[eax+edx-12+1] |
||
2824 | call file_read |
||
2825 | |||
2826 | ret>>>>65536 |
||
2827 |