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Rev | Author | Line No. | Line |
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5596 | serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; FAT functions for KolibriOS ;; |
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7 | ;; ;; |
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8 | ;; Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it ;; |
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9 | ;; ;; |
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10 | ;; See file COPYING for details ;; |
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5594 | serge | 11 | ;; 06.2015 fs_read64 - pathoswithin ;; |
5596 | serge | 12 | ;; 04.02.2007 LFN create folder - diamond ;; |
13 | ;; 08.10.2006 LFN delete file/folder - diamond ;; |
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14 | ;; 20.08.2006 LFN set file size (truncate/extend) - diamond ;; |
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15 | ;; 17.08.2006 LFN write/append to file - diamond ;; |
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16 | ;; 23.06.2006 LFN start application - diamond ;; |
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17 | ;; 15.06.2006 LFN get/set file/folder info - diamond ;; |
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18 | ;; 27.05.2006 LFN create/rewrite file - diamond ;; |
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19 | ;; 04.05.2006 LFN read folder - diamond ;; |
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20 | ;; 29.04.2006 Elimination of hangup after the ;; |
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21 | ;; expiration hd_wait_timeout - Mario79 ;; |
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22 | ;; 23.04.2006 LFN read file - diamond ;; |
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23 | ;; 28.01.2006 find all Fat16/32 partition in all input point ;; |
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24 | ;; to MBR, see file part_set.inc - Mario79 ;; |
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25 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
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26 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
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27 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
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28 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
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29 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
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30 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
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31 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
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32 | ;; 08.11.2004 rename - ATV ;; |
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33 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
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34 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
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35 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
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5594 | serge | 36 | ;; 06.09.2004 Fix free space - Mario79 ;; |
37 | ;; 24.05.2004 Write back buffer for File_write - VT ;; |
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38 | ;; 20.05.2004 File_read function to work with syscall 58 - VT ;; |
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39 | ;; 30.03.2004 Error parameters at function return - VT ;; |
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40 | ;; 29.06.2002 Improved fat32 verification - VT ;; |
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41 | ;; 20.05.2002 Hd status check - VT ;; |
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42 | ;; 01.05.2002 Bugfix in device write - VT ;; |
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5596 | serge | 43 | ;; ;; |
5594 | serge | 44 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
4287 | Serge | 45 | |
5596 | serge | 46 | $Revision: 5578 $ |
4287 | Serge | 47 | |
48 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
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49 | |||
50 | PUSHAD_EAX equ [esp+28] |
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51 | PUSHAD_ECX equ [esp+24] |
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52 | PUSHAD_EDX equ [esp+20] |
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53 | PUSHAD_EBX equ [esp+16] |
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54 | PUSHAD_EBP equ [esp+8] |
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55 | PUSHAD_ESI equ [esp+4] |
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56 | PUSHAD_EDI equ [esp+0] |
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57 | |||
58 | ; Internal data for every FAT partition. |
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59 | struct FAT PARTITION |
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60 | fs_type db ? |
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61 | fat16_root db 0 ; flag for fat16 rootdir |
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62 | fat_change db 0 ; 1=fat has changed |
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5594 | serge | 63 | rb 1 |
5596 | serge | 64 | Lock MUTEX ? ; currently operations with one partition |
5594 | serge | 65 | ; can not be executed in parallel since the legacy code is not ready |
4287 | Serge | 66 | SECTORS_PER_FAT dd 0x1f3a |
67 | NUMBER_OF_FATS dd 0x2 |
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68 | SECTORS_PER_CLUSTER dd 0x8 |
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69 | BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes |
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70 | ROOT_CLUSTER dd 2 ; first rootdir cluster |
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71 | FAT_START dd 0 ; start of fat table |
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72 | ROOT_START dd 0 ; start of rootdir (only fat16) |
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73 | ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16) |
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74 | DATA_START dd 0 ; start of data area (=first cluster 2) |
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75 | LAST_CLUSTER dd 0 ; last availabe cluster |
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76 | ADR_FSINFO dd 0 ; used only by fat32 |
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77 | |||
78 | fatRESERVED dd 0x0FFFFFF6 |
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79 | fatBAD dd 0x0FFFFFF7 |
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80 | fatEND dd 0x0FFFFFF8 |
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81 | fatMASK dd 0x0FFFFFFF |
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82 | |||
83 | fatStartScan dd 2 |
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84 | cluster_tmp dd 0 ; used by analyze_directory |
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85 | ; and analyze_directory_to_write |
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86 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
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87 | longname_sec2 dd 0 ; directory sectors for delete long filename |
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88 | fat_in_cache dd -1 |
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89 | |||
90 | ; For FAT16/FAT32, this points to 512-byte buffer for the current sector of FAT. |
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91 | ; For FAT12, the entire FAT structure is read |
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92 | ; and unpacked from 12bit per cluster to word per cluster. |
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5594 | serge | 93 | |
4287 | Serge | 94 | ; Note: work with unpacked copy of FAT12 means |
95 | ; additional memory and additional code for packing/unpacking. |
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96 | ; I'm not sure that the economy justifies the cost, but anyway, |
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97 | ; there is how work was done before my edits, and I'm just keeping the principle. |
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98 | fat_cache_ptr dd ? |
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99 | fat12_unpacked_ptr dd ? |
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100 | buffer rb 512 |
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101 | fsinfo_buffer rb 512 |
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102 | ends |
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103 | |||
104 | uglobal |
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105 | align 4 |
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106 | partition_count dd 0 ; partitions found by set_FAT32_variables |
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5594 | serge | 107 | hd_error dd 0 |
4287 | Serge | 108 | hd_setup dd 0 |
109 | hd_wait_timeout dd 0 |
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110 | cache_search_start dd 0 ; used by find_empty_slot |
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111 | endg |
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112 | |||
113 | uglobal |
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114 | align 4 |
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5594 | serge | 115 | Sector512: ; label for dev_hdcd.inc |
116 | buffer: |
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117 | rb 512 |
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4287 | Serge | 118 | endg |
119 | |||
120 | iglobal |
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121 | align 4 |
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122 | fat_user_functions: |
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123 | dd fat_free |
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124 | dd (fat_user_functions_end - fat_user_functions - 4) / 4 |
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125 | dd fat_Read |
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126 | dd fat_ReadFolder |
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127 | dd fat_Rewrite |
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128 | dd fat_Write |
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129 | dd fat_SetFileEnd |
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130 | dd fat_GetFileInfo |
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131 | dd fat_SetFileInfo |
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132 | dd 0 |
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133 | dd fat_Delete |
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134 | dd fat_CreateFolder |
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135 | fat_user_functions_end: |
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136 | endg |
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137 | |||
138 | ; these labels are located before the main function to make |
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139 | ; most of jumps to these be short |
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140 | fat_create_partition.free_return0: |
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141 | mov eax, ebp |
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142 | call free |
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143 | pop ebp |
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144 | fat_create_partition.return0: |
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145 | xor eax, eax |
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146 | ret |
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147 | fat_create_partition: |
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5201 | serge | 148 | ; sector size must be 512 |
149 | cmp dword [esi+DISK.MediaInfo.SectorSize], 512 |
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150 | jnz .return0 |
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4287 | Serge | 151 | ; bootsector must have been successfully read |
152 | cmp dword [esp+4], 0 |
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153 | jnz .return0 |
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154 | ; bootsector signature must be correct |
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155 | cmp word [ebx+0x1fe], 0xaa55 |
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156 | jnz .return0 |
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157 | ; sectors per cluster must be nonzero |
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158 | cmp byte [ebx+0xd], 0 |
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159 | jz .return0 |
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160 | ; bytes per sector must be 0x200 |
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161 | cmp word [ebx+0xb], 0x200 |
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162 | jnz .return0 |
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163 | ; number of fats must be nonzero |
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164 | cmp byte [ebx+0x10], 0 |
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165 | jz .return0 |
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166 | ; The only reason to be invalid partition now is FAT12. Since the test for |
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167 | ; FAT size requires knowledge of some calculated values, which are also used |
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168 | ; in the normal operation, let's hope for the best and allocate data now; if |
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169 | ; it will prove wrong, just deallocate it. |
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170 | movi eax, sizeof.FAT |
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171 | call malloc |
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172 | test eax, eax |
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173 | jz .return0 |
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174 | mov ecx, dword [ebp+PARTITION.FirstSector] |
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175 | mov dword [eax+FAT.FirstSector], ecx |
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176 | mov ecx, dword [ebp+PARTITION.FirstSector+4] |
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177 | mov dword [eax+FAT.FirstSector+4], ecx |
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178 | mov ecx, dword [ebp+PARTITION.Length] |
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179 | mov dword [eax+FAT.Length], ecx |
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180 | mov ecx, dword [ebp+PARTITION.Length+4] |
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181 | mov dword [eax+FAT.Length+4], ecx |
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182 | mov ecx, [ebp+PARTITION.Disk] |
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183 | mov [eax+FAT.Disk], ecx |
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184 | mov [eax+FAT.FSUserFunctions], fat_user_functions |
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185 | or [eax+FAT.fat_in_cache], -1 |
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186 | mov [eax+FAT.fat_change], 0 |
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187 | push ebp |
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188 | mov ebp, eax |
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189 | |||
190 | lea ecx, [ebp+FAT.Lock] |
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191 | call mutex_init |
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192 | |||
193 | movzx eax, word [ebx+0xe] ; sectors reserved |
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194 | mov [ebp+FAT.FAT_START], eax |
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195 | |||
196 | movzx eax, byte [ebx+0xd] ; sectors per cluster |
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197 | mov [ebp+FAT.SECTORS_PER_CLUSTER], eax |
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198 | |||
199 | movzx ecx, word [ebx+0xb] ; bytes per sector |
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200 | mov [ebp+FAT.BYTES_PER_SECTOR], ecx |
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201 | |||
202 | movzx eax, word [ebx+0x11] ; count of rootdir entries (=0 fat32) |
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203 | shl eax, 5 ; mul 32 |
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204 | dec ecx |
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205 | add eax, ecx ; round up if not equal count |
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206 | inc ecx ; bytes per sector |
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207 | xor edx, edx |
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208 | div ecx |
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209 | mov [ebp+FAT.ROOT_SECTORS], eax ; count of rootdir sectors |
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210 | |||
211 | movzx eax, word [ebx+0x16] ; sectors per fat <65536 |
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212 | test eax, eax |
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213 | jnz @f |
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214 | mov eax, [ebx+0x24] ; sectors per fat |
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215 | @@: |
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216 | mov [ebp+FAT.SECTORS_PER_FAT], eax |
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217 | |||
218 | movzx eax, byte [ebx+0x10] ; number of fats |
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219 | mov [ebp+FAT.NUMBER_OF_FATS], eax |
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220 | mul [ebp+FAT.SECTORS_PER_FAT] |
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221 | test edx, edx |
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222 | jnz .free_return0 |
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223 | add eax, [ebp+FAT.FAT_START] |
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224 | jc .free_return0 |
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225 | mov [ebp+FAT.ROOT_START], eax ; rootdir = fat_start + fat_size * fat_count |
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226 | add eax, [ebp+FAT.ROOT_SECTORS] ; rootdir sectors should be 0 on fat32 |
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227 | jc .free_return0 |
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228 | mov [ebp+FAT.DATA_START], eax ; data area = rootdir + rootdir_size |
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229 | |||
230 | movzx eax, word [ebx+0x13] ; total sector count <65536 |
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231 | test eax, eax |
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232 | jnz @f |
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233 | mov eax, [ebx+0x20] ; total sector count |
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234 | @@: |
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235 | ; total sector count must not exceed partition size |
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236 | cmp dword [ebp+FAT.Length+4], 0 |
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237 | jnz @f |
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238 | cmp eax, dword [ebp+FAT.Length] |
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239 | ja .free_return0 |
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240 | @@: |
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241 | mov dword [ebp+FAT.Length], eax |
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242 | and dword [ebp+FAT.Length+4], 0 |
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243 | sub eax, [ebp+FAT.DATA_START] ; eax = count of data sectors |
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244 | jc .free_return0 |
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245 | xor edx, edx |
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246 | div [ebp+FAT.SECTORS_PER_CLUSTER] |
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247 | inc eax |
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248 | mov [ebp+FAT.LAST_CLUSTER], eax |
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249 | dec eax ; cluster count |
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250 | jz .free_return0 |
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251 | mov [ebp+FAT.fatStartScan], 2 |
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252 | |||
253 | ; limits by Microsoft Hardware White Paper v1.03 |
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254 | cmp eax, 4085 ; 0xff5 |
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255 | jb .fat12 |
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256 | cmp eax, 65525 ; 0xfff5 |
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257 | jb .fat16 |
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258 | .fat32: |
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259 | mov eax, [ebx+0x2c] ; rootdir cluster |
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260 | mov [ebp+FAT.ROOT_CLUSTER], eax |
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261 | movzx eax, word [ebx+0x30] |
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262 | mov [ebp+FAT.ADR_FSINFO], eax |
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263 | push ebx |
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264 | add ebx, 512 |
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265 | call fs_read32_sys |
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266 | test eax, eax |
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267 | jnz @f |
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268 | mov eax, [ebx+0x1ec] |
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269 | cmp eax, -1 |
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270 | jz @f |
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271 | mov [ebp+FAT.fatStartScan], eax |
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272 | @@: |
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273 | pop ebx |
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274 | mov [ebp+FAT.fatRESERVED], 0x0FFFFFF6 |
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275 | mov [ebp+FAT.fatBAD], 0x0FFFFFF7 |
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276 | mov [ebp+FAT.fatEND], 0x0FFFFFF8 |
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277 | mov [ebp+FAT.fatMASK], 0x0FFFFFFF |
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278 | mov al, 32 |
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279 | .fat_not_12_finalize: |
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280 | mov [ebp+FAT.fs_type], al |
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281 | ; For FAT16 and FAT32, allocate 512 bytes for FAT cache. |
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282 | mov eax, 512 |
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283 | call malloc |
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284 | test eax, eax |
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285 | jz .free_return0 |
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286 | mov [ebp+FAT.fat_cache_ptr], eax |
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287 | mov eax, ebp |
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288 | pop ebp |
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289 | ret |
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290 | .fat16: |
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291 | and [ebp+FAT.ROOT_CLUSTER], 0 |
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292 | mov [ebp+FAT.fatRESERVED], 0x0000FFF6 |
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293 | mov [ebp+FAT.fatBAD], 0x0000FFF7 |
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294 | mov [ebp+FAT.fatEND], 0x0000FFF8 |
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295 | mov [ebp+FAT.fatMASK], 0x0000FFFF |
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296 | mov al, 16 |
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297 | jmp .fat_not_12_finalize |
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298 | .fat12: |
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299 | and [ebp+FAT.ROOT_CLUSTER], 0 |
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300 | mov [ebp+FAT.fatRESERVED], 0xFF6 |
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301 | mov [ebp+FAT.fatBAD], 0xFF7 |
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302 | mov [ebp+FAT.fatEND], 0xFFF |
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303 | mov [ebp+FAT.fatMASK], 0xFFF |
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304 | mov al, 12 |
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305 | mov [ebp+FAT.fs_type], al |
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306 | ; For FAT12, allocate&read data for entire table: |
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307 | ; calculate A = ALIGN_UP(NUM_CLUSTERS, 8), |
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308 | ; calculatefatchain/restorefatchain will process A items, |
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309 | ; allocate ALIGN_UP(A*3/2, 512) bytes for FAT table plus A*2 bytes for unpacked data. |
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310 | mov eax, [ebp+FAT.LAST_CLUSTER] |
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311 | and eax, not 7 |
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312 | add eax, 8 |
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313 | mov edx, eax |
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314 | lea eax, [eax*3] |
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315 | add eax, 512*2-1 |
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316 | shr eax, 10 |
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317 | shl eax, 9 |
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318 | lea eax, [eax+edx*2] |
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319 | call malloc |
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320 | test eax, eax |
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321 | jz .free_return0 |
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322 | ; Read ALIGN_UP(NUM_CLUSTERS*3/2, 512) bytes. |
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323 | ; Note that this can be less than allocated, this is ok, |
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324 | ; overallocation simplifies calculatefatchain/restorefatchain. |
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325 | push ebx |
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326 | mov [ebp+FAT.fat_cache_ptr], eax |
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327 | mov edx, [ebp+FAT.LAST_CLUSTER] |
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328 | lea edx, [(edx+1)*3 + 512*2-1] |
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329 | shr edx, 10 |
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330 | xchg eax, ebx |
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331 | xor eax, eax |
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332 | .read_fat: |
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333 | push eax |
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334 | add eax, [ebp+FAT.FAT_START] |
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335 | call fs_read32_sys |
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336 | test eax, eax |
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337 | pop eax |
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338 | jz @f |
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339 | dbgstr 'Failed to read FAT table' |
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340 | mov eax, [ebp+FAT.fat_cache_ptr] |
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341 | call free |
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342 | pop ebx |
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343 | jmp .free_return0 |
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344 | @@: |
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345 | add ebx, 512 |
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346 | inc eax |
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347 | cmp eax, edx |
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348 | jb .read_fat |
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349 | mov [ebp+FAT.fat12_unpacked_ptr], ebx |
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350 | call calculatefatchain |
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351 | pop ebx |
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352 | mov eax, ebp |
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353 | pop ebp |
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354 | ret |
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355 | |||
356 | fat_free: |
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357 | push eax |
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358 | mov eax, [eax+FAT.fat_cache_ptr] |
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359 | call free |
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360 | pop eax |
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361 | jmp free |
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362 | |||
363 | calculatefatchain: |
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364 | |||
365 | pushad |
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366 | |||
367 | mov esi, [ebp+FAT.fat_cache_ptr] |
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368 | mov edi, [ebp+FAT.fat12_unpacked_ptr] |
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369 | |||
370 | mov edx, [ebp+FAT.LAST_CLUSTER] |
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371 | and edx, not 7 |
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372 | lea edx, [edi+(edx+8)*2] |
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373 | push edx |
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374 | |||
375 | fcnew: |
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376 | mov eax, dword [esi] |
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377 | mov ebx, dword [esi+4] |
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378 | mov ecx, dword [esi+8] |
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379 | mov edx, ecx |
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380 | shr edx, 4;8 ok |
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381 | shr dx, 4;7 ok |
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382 | xor ch, ch |
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383 | shld ecx, ebx, 20;6 ok |
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384 | shr cx, 4;5 ok |
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385 | shld ebx, eax, 12 |
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386 | and ebx, 0x0fffffff;4 ok |
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387 | shr bx, 4;3 ok |
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388 | shl eax, 4 |
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389 | and eax, 0x0fffffff;2 ok |
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390 | shr ax, 4;1 ok |
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391 | mov dword [edi], eax |
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392 | mov dword [edi+4], ebx |
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393 | mov dword [edi+8], ecx |
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394 | mov dword [edi+12], edx |
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395 | add edi, 16 |
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396 | add esi, 12 |
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397 | |||
398 | cmp edi, [esp] |
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399 | jnz fcnew |
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400 | pop eax |
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401 | |||
402 | popad |
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403 | ret |
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404 | |||
405 | |||
406 | restorefatchain: ; restore fat chain |
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407 | |||
408 | pushad |
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409 | |||
410 | mov esi, [ebp+FAT.fat12_unpacked_ptr] |
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411 | mov edi, [ebp+FAT.fat_cache_ptr] |
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412 | |||
413 | mov edx, [ebp+FAT.LAST_CLUSTER] |
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414 | and edx, not 7 |
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415 | lea edx, [esi+(edx+8)*2] |
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416 | |||
417 | fcnew2: |
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418 | mov eax, dword [esi] |
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419 | mov ebx, dword [esi+4] |
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420 | shl ax, 4 |
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421 | shl eax, 4 |
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422 | shl bx, 4 |
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423 | shr ebx, 4 |
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424 | shrd eax, ebx, 8 |
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425 | shr ebx, 8 |
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426 | mov dword [edi], eax |
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427 | mov word [edi+4], bx |
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428 | add edi, 6 |
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429 | add esi, 8 |
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430 | |||
431 | cmp esi, edx |
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432 | jb fcnew2 |
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433 | |||
434 | mov esi, [ebp+FAT.NUMBER_OF_FATS] |
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435 | mov edx, [ebp+FAT.LAST_CLUSTER] |
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436 | lea edx, [(edx+1)*3 + 512*2-1] |
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437 | shr edx, 10 |
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438 | push [ebp+FAT.FAT_START] |
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439 | |||
440 | .write_fats: |
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441 | xor eax, eax |
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442 | mov ebx, [ebp+FAT.fat_cache_ptr] |
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443 | .loop1: |
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444 | push eax |
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445 | add eax, [esp+4] |
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446 | call fs_write32_sys |
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447 | test eax, eax |
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448 | pop eax |
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449 | jnz .fail |
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450 | add ebx, 512 |
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451 | inc eax |
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452 | cmp eax, edx |
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453 | jb .loop1 |
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454 | pop eax |
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455 | add eax, [ebp+FAT.SECTORS_PER_FAT] |
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456 | push eax |
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457 | dec esi |
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458 | jnz .write_fats |
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459 | pop eax |
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460 | |||
461 | popad |
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462 | ret |
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463 | .fail: |
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464 | dbgstr 'Failed to save FAT' |
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465 | popad |
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466 | ret |
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467 | |||
468 | iglobal |
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469 | label fat_legal_chars byte |
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470 | ; 0 = not allowed |
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471 | ; 1 = allowed only in long names |
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472 | ; 3 = allowed |
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473 | times 32 db 0 |
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474 | ; ! " # $ % & ' ( ) * + , - . / |
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475 | db 1,3,0,3,3,3,3,3,3,3,0,1,1,3,3,0 |
||
476 | ; 0 1 2 3 4 5 6 7 8 9 : ; < = > ? |
||
477 | db 3,3,3,3,3,3,3,3,3,3,0,1,0,1,0,0 |
||
478 | ; @ A B C D E F G H I J K L M N O |
||
479 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
480 | ; P Q R S T U V W X Y Z [ \ ] ^ _ |
||
481 | db 3,3,3,3,3,3,3,3,3,3,3,1,0,1,3,3 |
||
482 | ; ` a b c d e f g h i j k l m n o |
||
483 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
484 | ; p q r s t u v w x y z { | } ~ |
||
485 | db 3,3,3,3,3,3,3,3,3,3,3,3,0,3,3,0 |
||
486 | endg |
||
487 | |||
488 | fat_name_is_legal: |
||
489 | ; in: esi->(long) name |
||
490 | ; out: CF set <=> legal |
||
491 | ; destroys eax |
||
492 | push esi |
||
493 | xor eax, eax |
||
494 | @@: |
||
495 | lodsb |
||
496 | test al, al |
||
497 | jz .done |
||
498 | cmp al, 80h |
||
499 | jae .big |
||
500 | test [fat_legal_chars+eax], 1 |
||
501 | jnz @b |
||
502 | .err: |
||
503 | pop esi |
||
504 | clc |
||
505 | ret |
||
506 | .big: |
||
507 | ; 0x80-0xAF, 0xE0-0xEF |
||
508 | cmp al, 0xB0 |
||
509 | jb @b |
||
510 | cmp al, 0xE0 |
||
511 | jb .err |
||
512 | cmp al, 0xF0 |
||
513 | jb @b |
||
514 | jmp .err |
||
515 | .done: |
||
516 | sub esi, [esp] |
||
517 | cmp esi, 257 |
||
518 | pop esi |
||
519 | ret |
||
520 | |||
521 | fat_next_short_name: |
||
522 | ; in: edi->8+3 name |
||
523 | ; out: name corrected |
||
524 | ; CF=1 <=> error |
||
525 | pushad |
||
526 | mov ecx, 8 |
||
527 | mov al, '~' |
||
528 | std |
||
529 | push edi |
||
530 | add edi, 7 |
||
531 | repnz scasb |
||
532 | pop edi |
||
533 | cld |
||
534 | jz .tilde |
||
535 | ; tilde is not found, insert "~1" at end |
||
536 | add edi, 6 |
||
537 | cmp word [edi], ' ' |
||
538 | jnz .insert_tilde |
||
539 | @@: |
||
540 | dec edi |
||
541 | cmp byte [edi], ' ' |
||
542 | jz @b |
||
543 | inc edi |
||
544 | .insert_tilde: |
||
545 | mov word [edi], '~1' |
||
546 | popad |
||
547 | clc |
||
548 | ret |
||
549 | .tilde: |
||
550 | push edi |
||
551 | add edi, 7 |
||
552 | xor ecx, ecx |
||
553 | @@: |
||
554 | ; after tilde may be only digits and trailing spaces |
||
555 | cmp byte [edi], '~' |
||
556 | jz .break |
||
557 | cmp byte [edi], ' ' |
||
558 | jz .space |
||
559 | cmp byte [edi], '9' |
||
560 | jnz .found |
||
561 | dec edi |
||
562 | jmp @b |
||
563 | .space: |
||
564 | dec edi |
||
565 | inc ecx |
||
566 | jmp @b |
||
567 | .found: |
||
568 | inc byte [edi] |
||
569 | add dword [esp], 8 |
||
570 | jmp .zerorest |
||
571 | .break: |
||
572 | jecxz .noplace |
||
573 | inc edi |
||
574 | mov al, '1' |
||
575 | @@: |
||
576 | xchg al, [edi] |
||
577 | inc edi |
||
578 | cmp al, ' ' |
||
579 | mov al, '0' |
||
580 | jnz @b |
||
581 | .succ: |
||
582 | pop edi |
||
583 | popad |
||
584 | clc |
||
585 | ret |
||
586 | .noplace: |
||
587 | dec edi |
||
588 | cmp edi, [esp] |
||
589 | jz .err |
||
590 | add dword [esp], 8 |
||
591 | mov word [edi], '~1' |
||
592 | inc edi |
||
593 | inc edi |
||
594 | @@: |
||
595 | mov byte [edi], '0' |
||
596 | .zerorest: |
||
597 | inc edi |
||
598 | cmp edi, [esp] |
||
599 | jb @b |
||
600 | pop edi |
||
601 | popad |
||
602 | ;clc ; automatically |
||
603 | ret |
||
604 | .err: |
||
605 | pop edi |
||
606 | popad |
||
607 | stc |
||
608 | ret |
||
609 | |||
610 | fat_gen_short_name: |
||
611 | ; in: esi->long name |
||
612 | ; edi->buffer (8+3=11 chars) |
||
613 | ; out: buffer filled |
||
614 | pushad |
||
615 | mov eax, ' ' |
||
616 | push edi |
||
617 | stosd |
||
618 | stosd |
||
619 | stosd |
||
620 | pop edi |
||
621 | xor eax, eax |
||
622 | movi ebx, 8 |
||
623 | lea ecx, [edi+8] |
||
624 | .loop: |
||
625 | lodsb |
||
626 | test al, al |
||
627 | jz .done |
||
628 | call char_toupper |
||
629 | cmp al, ' ' |
||
630 | jz .space |
||
631 | cmp al, 80h |
||
632 | ja .big |
||
633 | test [fat_legal_chars+eax], 2 |
||
634 | jnz .symbol |
||
635 | .inv_symbol: |
||
636 | mov al, '_' |
||
637 | or bh, 1 |
||
638 | .symbol: |
||
639 | cmp al, '.' |
||
640 | jz .dot |
||
641 | .normal_symbol: |
||
642 | dec bl |
||
643 | jns .store |
||
644 | mov bl, 0 |
||
645 | .space: |
||
646 | or bh, 1 |
||
647 | jmp .loop |
||
648 | .store: |
||
649 | stosb |
||
650 | jmp .loop |
||
651 | .big: |
||
652 | cmp al, 0xB0 |
||
653 | jb .normal_symbol |
||
654 | cmp al, 0xE0 |
||
655 | jb .inv_symbol |
||
656 | cmp al, 0xF0 |
||
657 | jb .normal_symbol |
||
658 | jmp .inv_symbol |
||
659 | .dot: |
||
660 | test bh, 2 |
||
661 | jz .firstdot |
||
662 | pop ebx |
||
663 | add ebx, edi |
||
664 | sub ebx, ecx |
||
665 | push ebx |
||
666 | cmp ebx, ecx |
||
667 | jb @f |
||
668 | pop ebx |
||
669 | push ecx |
||
670 | @@: |
||
671 | cmp edi, ecx |
||
672 | jbe .skip |
||
673 | @@: |
||
674 | dec edi |
||
675 | mov al, [edi] |
||
676 | dec ebx |
||
677 | mov [ebx], al |
||
678 | mov byte [edi], ' ' |
||
679 | cmp edi, ecx |
||
680 | ja @b |
||
681 | .skip: |
||
682 | mov bh, 3 |
||
683 | jmp @f |
||
684 | .firstdot: |
||
685 | cmp bl, 8 |
||
686 | jz .space |
||
687 | push edi |
||
688 | or bh, 2 |
||
689 | @@: |
||
690 | mov edi, ecx |
||
691 | mov bl, 3 |
||
692 | jmp .loop |
||
693 | .done: |
||
694 | test bh, 2 |
||
695 | jz @f |
||
696 | pop edi |
||
697 | @@: |
||
698 | lea edi, [ecx-8] |
||
699 | test bh, 1 |
||
700 | jz @f |
||
701 | call fat_next_short_name |
||
702 | @@: |
||
703 | popad |
||
704 | ret |
||
705 | |||
706 | fat12_free_space: |
||
707 | ;--------------------------------------------- |
||
708 | ; |
||
709 | ; returns free space in edi |
||
710 | ; rewr.by Mihasik |
||
711 | ;--------------------------------------------- |
||
712 | |||
713 | push eax ebx ecx |
||
714 | |||
715 | mov edi, [ebp+FAT.fat12_unpacked_ptr];start of FAT |
||
716 | xor ax, ax;Free cluster=0x0000 in FAT |
||
717 | xor ebx, ebx;counter |
||
718 | mov ecx, [ebp+FAT.LAST_CLUSTER] |
||
719 | inc ecx |
||
720 | cld |
||
721 | rdfs1: |
||
722 | repne scasw |
||
723 | jnz rdfs2 ;if last cluster not 0 |
||
724 | inc ebx |
||
725 | test ecx, ecx |
||
726 | jnz rdfs1 |
||
727 | rdfs2: |
||
728 | shl ebx, 9;free clusters*512 |
||
729 | mov edi, ebx |
||
730 | |||
731 | pop ecx ebx eax |
||
732 | ret |
||
733 | |||
734 | |||
735 | |||
736 | set_FAT: |
||
737 | ;-------------------------------- |
||
738 | ; input : EAX = cluster |
||
739 | ; EDX = value to save |
||
740 | ; EBP = pointer to FAT structure |
||
741 | ; output : EDX = old value |
||
742 | ;-------------------------------- |
||
743 | ; out: CF set <=> error |
||
744 | push eax ebx esi |
||
745 | |||
746 | cmp eax, 2 |
||
747 | jb sfc_error |
||
748 | cmp eax, [ebp+FAT.LAST_CLUSTER] |
||
749 | ja sfc_error |
||
750 | cmp [ebp+FAT.fs_type], 12 |
||
751 | je set_FAT12 |
||
752 | cmp [ebp+FAT.fs_type], 16 |
||
753 | je sfc_1 |
||
754 | add eax, eax |
||
755 | sfc_1: |
||
756 | add eax, eax |
||
757 | mov esi, 511 |
||
758 | and esi, eax ; esi = position in fat sector |
||
759 | shr eax, 9 ; eax = fat sector |
||
760 | add eax, [ebp+FAT.FAT_START] |
||
761 | mov ebx, [ebp+FAT.fat_cache_ptr] |
||
762 | |||
763 | cmp eax, [ebp+FAT.fat_in_cache]; is fat sector already in memory? |
||
764 | je sfc_in_cache ; yes |
||
765 | |||
766 | cmp [ebp+FAT.fat_change], 0; is fat changed? |
||
767 | je sfc_no_change ; no |
||
768 | call write_fat_sector; yes. write it into disk |
||
769 | jc sfc_error |
||
770 | |||
771 | sfc_no_change: |
||
772 | mov [ebp+FAT.fat_in_cache], eax; save fat sector |
||
773 | call fs_read32_sys |
||
774 | test eax, eax |
||
775 | jne sfc_error |
||
776 | |||
777 | |||
778 | sfc_in_cache: |
||
779 | cmp [ebp+FAT.fs_type], 16 |
||
780 | jne sfc_test32 |
||
781 | |||
782 | sfc_set16: |
||
783 | xchg [ebx+esi], dx ; save new value and get old value |
||
784 | jmp sfc_write |
||
785 | |||
786 | sfc_test32: |
||
787 | mov eax, [ebp+FAT.fatMASK] |
||
788 | |||
789 | sfc_set32: |
||
790 | and edx, eax |
||
791 | xor eax, -1 ; mask for high bits |
||
792 | and eax, [ebx+esi] ; get high 4 bits |
||
793 | or eax, edx |
||
794 | mov edx, [ebx+esi] ; get old value |
||
795 | mov [ebx+esi], eax ; save new value |
||
796 | |||
797 | sfc_write: |
||
798 | mov [ebp+FAT.fat_change], 1; fat has changed |
||
799 | |||
800 | sfc_nonzero: |
||
801 | and edx, [ebp+FAT.fatMASK] |
||
802 | |||
803 | sfc_return: |
||
804 | pop esi ebx eax |
||
805 | ret |
||
806 | sfc_error: |
||
807 | stc |
||
808 | jmp sfc_return |
||
809 | |||
810 | set_FAT12: |
||
811 | test edx, 0xF000 |
||
812 | jnz sfc_error |
||
813 | mov ebx, [ebp+FAT.fat12_unpacked_ptr] |
||
814 | xchg [ebx+eax*2], dx |
||
815 | mov [ebp+FAT.fat_change], 1 |
||
816 | pop esi ebx eax |
||
817 | clc |
||
818 | ret |
||
819 | |||
820 | get_FAT: |
||
821 | ;-------------------------------- |
||
822 | ; input : EAX = cluster |
||
823 | ; EBP = pointer to FAT structure |
||
824 | ; output : EAX = next cluster |
||
825 | ;-------------------------------- |
||
826 | ; out: CF set <=> error |
||
827 | push ebx esi |
||
828 | |||
829 | cmp [ebp+FAT.fs_type], 12 |
||
830 | je get_FAT12 |
||
831 | |||
832 | cmp [ebp+FAT.fs_type], 16 |
||
833 | je gfc_1 |
||
834 | add eax, eax |
||
835 | gfc_1: |
||
836 | add eax, eax |
||
837 | mov esi, 511 |
||
838 | and esi, eax ; esi = position in fat sector |
||
839 | shr eax, 9 ; eax = fat sector |
||
840 | add eax, [ebp+FAT.FAT_START] |
||
841 | mov ebx, [ebp+FAT.fat_cache_ptr] |
||
842 | |||
843 | cmp eax, [ebp+FAT.fat_in_cache]; is fat sector already in memory? |
||
844 | je gfc_in_cache |
||
845 | |||
846 | cmp [ebp+FAT.fat_change], 0; is fat changed? |
||
847 | je gfc_no_change ; no |
||
848 | call write_fat_sector; yes. write it into disk |
||
849 | jc hd_error_01 |
||
850 | |||
851 | gfc_no_change: |
||
852 | mov [ebp+FAT.fat_in_cache], eax |
||
853 | call fs_read32_sys |
||
854 | test eax, eax |
||
855 | jne hd_error_01 |
||
856 | |||
857 | gfc_in_cache: |
||
858 | mov eax, [ebx+esi] |
||
859 | and eax, [ebp+FAT.fatMASK] |
||
860 | gfc_return: |
||
861 | pop esi ebx |
||
862 | ret |
||
863 | hd_error_01: |
||
864 | stc |
||
865 | jmp gfc_return |
||
866 | |||
867 | get_FAT12: |
||
868 | mov ebx, [ebp+FAT.fat12_unpacked_ptr] |
||
869 | movzx eax, word [ebx+eax*2] |
||
870 | pop esi ebx |
||
871 | clc |
||
872 | ret |
||
873 | |||
874 | |||
875 | get_free_FAT: |
||
876 | ;----------------------------------------------------------- |
||
877 | ; output : if CARRY=0 EAX = # first cluster found free |
||
878 | ; if CARRY=1 disk full |
||
879 | ; Note : for more speed need to use fat_cache directly |
||
880 | ;----------------------------------------------------------- |
||
881 | push ecx |
||
882 | mov ecx, [ebp+FAT.LAST_CLUSTER]; counter for full disk |
||
883 | mov eax, [ebp+FAT.fatStartScan] |
||
884 | cmp [ebp+FAT.fs_type], 12 |
||
885 | jz get_free_FAT12 |
||
886 | dec ecx |
||
887 | cmp eax, 2 |
||
888 | jb gff_reset |
||
889 | |||
890 | gff_test: |
||
891 | cmp eax, [ebp+FAT.LAST_CLUSTER]; if above last cluster start at cluster 2 |
||
892 | jbe gff_in_range |
||
893 | gff_reset: |
||
894 | mov eax, 2 |
||
895 | |||
896 | gff_in_range: |
||
897 | push eax |
||
898 | call get_FAT ; get cluster state |
||
899 | jc gff_not_found_1 |
||
900 | |||
901 | test eax, eax ; is it free? |
||
902 | pop eax |
||
903 | je gff_found ; yes |
||
904 | inc eax ; next cluster |
||
905 | dec ecx ; is all checked? |
||
906 | jnz gff_test ; no |
||
907 | |||
908 | gff_not_found: |
||
909 | pop ecx ; yes. disk is full |
||
910 | stc |
||
911 | ret |
||
912 | |||
913 | gff_not_found_1: |
||
914 | pop eax |
||
915 | jmp gff_not_found |
||
916 | |||
917 | gff_found: |
||
918 | lea ecx, [eax+1] |
||
919 | mov [ebp+FAT.fatStartScan], ecx |
||
920 | pop ecx |
||
921 | clc |
||
922 | ret |
||
923 | |||
924 | get_free_FAT12: |
||
925 | push edx edi |
||
926 | mov edi, [ebp+FAT.fat12_unpacked_ptr] |
||
927 | cmp eax, 2 |
||
928 | jb .reset |
||
929 | cmp eax, ecx |
||
930 | jbe @f |
||
931 | .reset: |
||
932 | mov eax, 2 |
||
933 | @@: |
||
934 | mov edx, eax |
||
935 | lea edi, [edi+eax*2] |
||
936 | sub ecx, eax |
||
937 | inc ecx |
||
938 | xor eax, eax |
||
939 | repnz scasw |
||
940 | jz .found |
||
941 | cmp edx, 2 |
||
942 | jz .notfound |
||
943 | mov edi, [ebp+FAT.fat12_unpacked_ptr] |
||
944 | lea ecx, [edx-2] |
||
945 | repnz scasw |
||
946 | jnz .notfound |
||
947 | .found: |
||
948 | sub edi, [ebp+FAT.fat12_unpacked_ptr] |
||
949 | shr edi, 1 |
||
950 | mov [ebp+FAT.fatStartScan], edi |
||
951 | lea eax, [edi-1] |
||
952 | pop edi edx ecx |
||
953 | ret |
||
954 | .notfound: |
||
955 | pop edi edx ecx |
||
956 | stc |
||
957 | ret |
||
958 | |||
959 | |||
960 | write_fat_sector: |
||
961 | ;----------------------------------------------------------- |
||
962 | ; write changed fat to disk |
||
963 | ;----------------------------------------------------------- |
||
964 | push eax ebx ecx |
||
965 | |||
966 | mov [ebp+FAT.fat_change], 0 |
||
967 | mov eax, [ebp+FAT.fat_in_cache] |
||
968 | cmp eax, -1 |
||
969 | jz write_fat_not_used |
||
970 | mov ebx, [ebp+FAT.fat_cache_ptr] |
||
971 | mov ecx, [ebp+FAT.NUMBER_OF_FATS] |
||
972 | |||
973 | write_next_fat: |
||
974 | push eax |
||
975 | call fs_write32_sys |
||
976 | test eax, eax |
||
977 | pop eax |
||
978 | jnz write_fat_not_used |
||
979 | |||
980 | add eax, [ebp+FAT.SECTORS_PER_FAT] |
||
981 | dec ecx |
||
982 | jnz write_next_fat |
||
983 | |||
984 | write_fat_not_used: |
||
985 | pop ecx ebx eax |
||
986 | ret |
||
987 | |||
988 | |||
989 | |||
990 | |||
991 | |||
992 | bcd2bin: |
||
993 | ;---------------------------------- |
||
994 | ; input : AL=BCD number (eg. 0x11) |
||
995 | ; output : AH=0 |
||
996 | ; AL=decimal number (eg. 11) |
||
997 | ;---------------------------------- |
||
998 | xor ah, ah |
||
999 | shl ax, 4 |
||
1000 | shr al, 4 |
||
1001 | aad |
||
1002 | ret |
||
1003 | |||
1004 | |||
1005 | get_date_for_file: |
||
1006 | ;----------------------------------------------------- |
||
1007 | ; Get date from CMOS and pack day,month,year in AX |
||
1008 | ; DATE bits 0..4 : day of month 0..31 |
||
1009 | ; 5..8 : month of year 1..12 |
||
1010 | ; 9..15 : count of years from 1980 |
||
1011 | ;----------------------------------------------------- |
||
1012 | mov al, 0x7 ;day |
||
1013 | out 0x70, al |
||
1014 | in al, 0x71 |
||
1015 | call bcd2bin |
||
1016 | ror eax, 5 |
||
1017 | |||
1018 | mov al, 0x8 ;month |
||
1019 | out 0x70, al |
||
1020 | in al, 0x71 |
||
1021 | call bcd2bin |
||
1022 | ror eax, 4 |
||
1023 | |||
1024 | mov al, 0x9 ;year |
||
1025 | out 0x70, al |
||
1026 | in al, 0x71 |
||
1027 | call bcd2bin |
||
1028 | add ax, 20 ;because CMOS return only the two last |
||
1029 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
1030 | rol eax, 9 ;need the difference with 1980 (eg. 2001-1980) |
||
1031 | ret |
||
1032 | |||
1033 | |||
1034 | get_time_for_file: |
||
1035 | ;----------------------------------------------------- |
||
1036 | ; Get time from CMOS and pack hour,minute,second in AX |
||
1037 | ; TIME bits 0..4 : second (the low bit is lost) |
||
1038 | ; 5..10 : minute 0..59 |
||
1039 | ; 11..15 : hour 0..23 |
||
1040 | ;----------------------------------------------------- |
||
1041 | mov al, 0x0 ;second |
||
1042 | out 0x70, al |
||
1043 | in al, 0x71 |
||
1044 | call bcd2bin |
||
1045 | ror eax, 6 |
||
1046 | |||
1047 | mov al, 0x2 ;minute |
||
1048 | out 0x70, al |
||
1049 | in al, 0x71 |
||
1050 | call bcd2bin |
||
1051 | ror eax, 6 |
||
1052 | |||
1053 | mov al, 0x4 ;hour |
||
1054 | out 0x70, al |
||
1055 | in al, 0x71 |
||
1056 | call bcd2bin |
||
1057 | rol eax, 11 |
||
1058 | ret |
||
1059 | |||
1060 | |||
1061 | set_current_time_for_entry: |
||
1062 | ;----------------------------------------------------- |
||
1063 | ; Set current time/date for file entry |
||
1064 | ; input : ebx = file entry pointer |
||
1065 | ;----------------------------------------------------- |
||
1066 | push eax |
||
1067 | call get_time_for_file; update files date/time |
||
1068 | mov [ebx+22], ax |
||
1069 | call get_date_for_file |
||
1070 | mov [ebx+24], ax |
||
1071 | pop eax |
||
1072 | ret |
||
1073 | |||
1074 | |||
1075 | |||
1076 | add_disk_free_space: |
||
1077 | ;----------------------------------------------------- |
||
1078 | ; input : ecx = cluster count |
||
1079 | ; Note : negative = remove clusters from free space |
||
1080 | ; positive = add clusters to free space |
||
1081 | ;----------------------------------------------------- |
||
1082 | test ecx, ecx ; no change |
||
1083 | je add_dfs_no |
||
1084 | cmp [ebp+FAT.fs_type], 32 ; free disk space only used by fat32 |
||
1085 | jne add_dfs_no |
||
1086 | |||
1087 | push eax ebx |
||
1088 | mov eax, [ebp+FAT.ADR_FSINFO] |
||
1089 | lea ebx, [ebp+FAT.fsinfo_buffer] |
||
1090 | call fs_read32_sys |
||
1091 | test eax, eax |
||
1092 | jnz add_not_fs |
||
1093 | |||
1094 | cmp dword [ebx+0x1fc], 0xaa550000; check sector id |
||
1095 | jne add_not_fs |
||
1096 | |||
1097 | add [ebx+0x1e8], ecx |
||
1098 | push [ebp+FAT.fatStartScan] |
||
1099 | pop dword [ebx+0x1ec] |
||
1100 | mov eax, [ebp+FAT.ADR_FSINFO] |
||
1101 | call fs_write32_sys |
||
1102 | ; jc add_not_fs |
||
1103 | |||
1104 | add_not_fs: |
||
1105 | pop ebx eax |
||
1106 | |||
1107 | add_dfs_no: |
||
1108 | ret |
||
1109 | |||
1110 | |||
1111 | |||
1112 | clear_cluster_chain: |
||
1113 | ;----------------------------------------------------- |
||
1114 | ; input : eax = first cluster |
||
1115 | ;----------------------------------------------------- |
||
1116 | push eax ecx edx |
||
1117 | xor ecx, ecx ; cluster count |
||
1118 | |||
1119 | clean_new_chain: |
||
1120 | cmp eax, [ebp+FAT.LAST_CLUSTER]; end of file |
||
1121 | ja delete_OK |
||
1122 | cmp eax, 2 ; unfinished fat chain or zero length file |
||
1123 | jb delete_OK |
||
1124 | cmp eax, [ebp+FAT.ROOT_CLUSTER]; don't remove root cluster |
||
1125 | jz delete_OK |
||
1126 | |||
1127 | xor edx, edx |
||
1128 | call set_FAT ; clear fat entry |
||
1129 | jc access_denied_01 |
||
1130 | |||
1131 | inc ecx ; update cluster count |
||
1132 | mov eax, edx ; old cluster |
||
1133 | jmp clean_new_chain |
||
1134 | |||
1135 | delete_OK: |
||
1136 | call add_disk_free_space; add clusters to free disk space |
||
1137 | clc |
||
1138 | access_denied_01: |
||
1139 | pop edx ecx eax |
||
1140 | ret |
||
1141 | |||
1142 | |||
1143 | if 0 |
||
1144 | get_hd_info: |
||
1145 | ;----------------------------------------------------------- |
||
1146 | ; output : eax = 0 - ok |
||
1147 | ; 3 - unknown FS |
||
1148 | ; 10 - access denied |
||
1149 | ; edx = cluster size in bytes |
||
1150 | ; ebx = total clusters on disk |
||
1151 | ; ecx = free clusters on disk |
||
1152 | ;----------------------------------------------------------- |
||
1153 | cmp [ebp+FAT.fs_type], 16 |
||
1154 | jz info_fat_ok |
||
1155 | cmp [ebp+FAT.fs_type], 32 |
||
1156 | jz info_fat_ok |
||
1157 | xor edx, edx |
||
1158 | xor ebx, ebx |
||
1159 | xor ecx, ecx |
||
1160 | mov eax, ERROR_UNKNOWN_FS |
||
1161 | ret |
||
1162 | |||
1163 | info_fat_ok: |
||
1164 | ; call reserve_hd1 |
||
1165 | |||
1166 | xor ecx, ecx ; count of free clusters |
||
1167 | mov eax, 2 |
||
1168 | mov ebx, [ebp+FAT.LAST_CLUSTER] |
||
1169 | |||
1170 | info_cluster: |
||
1171 | push eax |
||
1172 | call get_FAT ; get cluster info |
||
1173 | jc info_access_denied |
||
1174 | |||
1175 | test eax, eax ; is it free? |
||
1176 | jnz info_used ; no |
||
1177 | inc ecx |
||
1178 | |||
1179 | info_used: |
||
1180 | pop eax |
||
1181 | inc eax |
||
1182 | cmp eax, ebx ; is above last cluster? |
||
1183 | jbe info_cluster ; no. test next cluster |
||
1184 | |||
1185 | dec ebx ; cluster count |
||
1186 | imul edx, [ebp+FAT.SECTORS_PER_CLUSTER], 512; cluster size in bytes |
||
1187 | xor eax, eax |
||
1188 | ret |
||
1189 | |||
1190 | info_access_denied: |
||
1191 | add esp, 4 |
||
1192 | xor edx, edx |
||
1193 | xor ebx, ebx |
||
1194 | xor ecx, ecx |
||
1195 | mov eax, ERROR_ACCESS_DENIED |
||
1196 | ret |
||
1197 | end if |
||
1198 | |||
1199 | update_disk: |
||
1200 | cmp [ebp+FAT.fat_change], 0 ; is fat changed? |
||
1201 | je upd_no_change |
||
1202 | cmp [ebp+FAT.fs_type], 12 |
||
1203 | jz .fat12 |
||
1204 | ;----------------------------------------------------------- |
||
1205 | ; write changed fat and cache to disk |
||
1206 | ;----------------------------------------------------------- |
||
1207 | |||
1208 | call write_fat_sector |
||
1209 | jc update_disk_acces_denied |
||
1210 | jmp upd_no_change |
||
1211 | .fat12: |
||
1212 | call restorefatchain |
||
1213 | mov [ebp+FAT.fat_change], 0 |
||
1214 | |||
1215 | upd_no_change: |
||
1216 | |||
1217 | push esi |
||
1218 | mov esi, [ebp+PARTITION.Disk] |
||
1219 | call disk_sync |
||
1220 | pop esi |
||
1221 | update_disk_acces_denied: |
||
1222 | ret |
||
1223 | |||
1224 | fat_lock: |
||
1225 | lea ecx, [ebp+FAT.Lock] |
||
1226 | jmp mutex_lock |
||
1227 | fat_unlock: |
||
1228 | lea ecx, [ebp+FAT.Lock] |
||
1229 | jmp mutex_unlock |
||
1230 | |||
1231 | ; \begin{diamond} |
||
1232 | uni2ansi_str: |
||
1233 | ; convert UNICODE zero-terminated string to ASCII-string (codepage 866) |
||
1234 | ; in: esi->source, edi->buffer (may be esi=edi) |
||
1235 | ; destroys: eax,esi,edi |
||
1236 | lodsw |
||
1237 | test ax, ax |
||
1238 | jz .done |
||
1239 | cmp ax, 0x80 |
||
1240 | jb .ascii |
||
1241 | cmp ax, 0x401 |
||
1242 | jz .yo1 |
||
1243 | cmp ax, 0x451 |
||
1244 | jz .yo2 |
||
1245 | cmp ax, 0x410 |
||
1246 | jb .unk |
||
1247 | cmp ax, 0x440 |
||
1248 | jb .rus1 |
||
1249 | cmp ax, 0x450 |
||
1250 | jb .rus2 |
||
1251 | .unk: |
||
1252 | mov al, '_' |
||
1253 | jmp .doit |
||
1254 | .yo1: |
||
1255 | mov al, 0xF0 ; 'Ё' |
||
1256 | jmp .doit |
||
1257 | .yo2: |
||
1258 | mov al, 0xF1 ; 'ё' |
||
1259 | jmp .doit |
||
1260 | .rus1: |
||
1261 | ; 0x410-0x43F -> 0x80-0xAF |
||
1262 | add al, 0x70 |
||
1263 | jmp .doit |
||
1264 | .rus2: |
||
1265 | ; 0x440-0x44F -> 0xE0-0xEF |
||
1266 | add al, 0xA0 |
||
1267 | .ascii: |
||
1268 | .doit: |
||
1269 | stosb |
||
1270 | jmp uni2ansi_str |
||
1271 | .done: |
||
1272 | mov byte [edi], 0 |
||
1273 | ret |
||
1274 | |||
1275 | ansi2uni_char: |
||
1276 | ; convert ANSI character in al to UNICODE character in ax, using cp866 encoding |
||
1277 | mov ah, 0 |
||
1278 | ; 0x00-0x7F - trivial map |
||
1279 | cmp al, 0x80 |
||
1280 | jb .ret |
||
1281 | ; 0x80-0xAF -> 0x410-0x43F |
||
1282 | cmp al, 0xB0 |
||
1283 | jae @f |
||
1284 | add ax, 0x410-0x80 |
||
1285 | .ret: |
||
1286 | ret |
||
1287 | @@: |
||
1288 | ; 0xE0-0xEF -> 0x440-0x44F |
||
1289 | cmp al, 0xE0 |
||
1290 | jb .unk |
||
1291 | cmp al, 0xF0 |
||
1292 | jae @f |
||
1293 | add ax, 0x440-0xE0 |
||
1294 | ret |
||
1295 | ; 0xF0 -> 0x401 |
||
1296 | ; 0xF1 -> 0x451 |
||
1297 | @@: |
||
1298 | cmp al, 0xF0 ; 'Ё' |
||
1299 | jz .yo1 |
||
1300 | cmp al, 0xF1 ; 'ё' |
||
1301 | jz .yo2 |
||
1302 | .unk: |
||
1303 | mov al, '_' ; ah=0 |
||
1304 | ret |
||
1305 | .yo1: |
||
1306 | mov ax, 0x401 |
||
1307 | ret |
||
1308 | .yo2: |
||
1309 | mov ax, 0x451 |
||
1310 | ret |
||
1311 | |||
1312 | char_toupper: |
||
1313 | ; convert character to uppercase, using cp866 encoding |
||
1314 | ; in: al=symbol |
||
1315 | ; out: al=converted symbol |
||
1316 | cmp al, 'a' |
||
1317 | jb .ret |
||
1318 | cmp al, 'z' |
||
1319 | jbe .az |
||
1320 | cmp al, 0xF1 ; 'ё' |
||
1321 | jz .yo1 |
||
1322 | cmp al, 0xA0 ; 'а' |
||
1323 | jb .ret |
||
1324 | cmp al, 0xE0 ; 'р' |
||
1325 | jb .rus1 |
||
1326 | cmp al, 0xEF ; 'я' |
||
1327 | ja .ret |
||
1328 | ; 0xE0-0xEF -> 0x90-0x9F |
||
1329 | sub al, 0xE0-0x90 |
||
1330 | .ret: |
||
1331 | ret |
||
1332 | .rus1: |
||
1333 | ; 0xA0-0xAF -> 0x80-0x8F |
||
1334 | .az: |
||
1335 | and al, not 0x20 |
||
1336 | ret |
||
1337 | .yo1: |
||
1338 | ; 0xF1 -> 0xF0 |
||
1339 | dec ax |
||
1340 | ret |
||
1341 | |||
1342 | fat_get_name: |
||
1343 | ; in: edi->FAT entry |
||
1344 | ; out: CF=1 - no valid entry |
||
1345 | ; else CF=0 and ebp->ASCIIZ-name |
||
1346 | ; (maximum length of filename is 255 (wide) symbols without trailing 0, |
||
1347 | ; but implementation requires buffer 261 words) |
||
1348 | ; destroys eax |
||
1349 | cmp byte [edi], 0 |
||
1350 | jz .no |
||
1351 | cmp byte [edi], 0xE5 |
||
1352 | jnz @f |
||
1353 | .no: |
||
1354 | stc |
||
1355 | ret |
||
1356 | @@: |
||
1357 | cmp byte [edi+11], 0xF |
||
1358 | jz .longname |
||
1359 | test byte [edi+11], 8 |
||
1360 | jnz .no |
||
1361 | push ecx |
||
1362 | push edi ebp |
||
1363 | test byte [ebp-4], 1 |
||
1364 | jnz .unicode_short |
||
1365 | |||
1366 | mov eax, [edi] |
||
1367 | mov ecx, [edi+4] |
||
1368 | mov [ebp], eax |
||
1369 | mov [ebp+4], ecx |
||
1370 | |||
1371 | mov ecx, 8 |
||
1372 | @@: |
||
1373 | cmp byte [ebp+ecx-1], ' ' |
||
1374 | loope @b |
||
1375 | |||
1376 | mov eax, [edi+8] |
||
1377 | cmp al, ' ' |
||
1378 | je .done |
||
1379 | shl eax, 8 |
||
1380 | mov al, '.' |
||
1381 | |||
1382 | lea ebp, [ebp+ecx+1] |
||
1383 | mov [ebp], eax |
||
1384 | mov ecx, 3 |
||
1385 | @@: |
||
1386 | rol eax, 8 |
||
1387 | cmp al, ' ' |
||
1388 | jne .done |
||
1389 | loop @b |
||
1390 | dec ebp |
||
1391 | .done: |
||
1392 | and byte [ebp+ecx+1], 0 ; CF=0 |
||
1393 | pop ebp edi ecx |
||
1394 | ret |
||
1395 | .unicode_short: |
||
1396 | mov ecx, 8 |
||
1397 | push ecx |
||
1398 | @@: |
||
1399 | mov al, [edi] |
||
1400 | inc edi |
||
1401 | call ansi2uni_char |
||
1402 | mov [ebp], ax |
||
1403 | inc ebp |
||
1404 | inc ebp |
||
1405 | loop @b |
||
1406 | pop ecx |
||
1407 | @@: |
||
1408 | cmp word [ebp-2], ' ' |
||
1409 | jnz @f |
||
1410 | dec ebp |
||
1411 | dec ebp |
||
1412 | loop @b |
||
1413 | @@: |
||
1414 | mov word [ebp], '.' |
||
1415 | inc ebp |
||
1416 | inc ebp |
||
1417 | mov ecx, 3 |
||
1418 | push ecx |
||
1419 | @@: |
||
1420 | mov al, [edi] |
||
1421 | inc edi |
||
1422 | call ansi2uni_char |
||
1423 | mov [ebp], ax |
||
1424 | inc ebp |
||
1425 | inc ebp |
||
1426 | loop @b |
||
1427 | pop ecx |
||
1428 | @@: |
||
1429 | cmp word [ebp-2], ' ' |
||
1430 | jnz @f |
||
1431 | dec ebp |
||
1432 | dec ebp |
||
1433 | loop @b |
||
1434 | dec ebp |
||
1435 | dec ebp |
||
1436 | @@: |
||
1437 | and word [ebp], 0 ; CF=0 |
||
1438 | pop ebp edi ecx |
||
1439 | ret |
||
1440 | .longname: |
||
1441 | ; LFN |
||
1442 | mov al, byte [edi] |
||
1443 | and eax, 0x3F |
||
1444 | dec eax |
||
1445 | cmp al, 20 |
||
1446 | jae .no ; ignore invalid entries |
||
1447 | mov word [ebp+260*2], 0 ; force null-terminating for orphans |
||
1448 | imul eax, 13*2 |
||
1449 | add ebp, eax |
||
1450 | test byte [edi], 0x40 |
||
1451 | jz @f |
||
1452 | mov word [ebp+13*2], 0 |
||
1453 | @@: |
||
1454 | push eax |
||
1455 | ; now copy name from edi to ebp ... |
||
1456 | mov eax, [edi+1] |
||
1457 | mov [ebp], eax ; symbols 1,2 |
||
1458 | mov eax, [edi+5] |
||
1459 | mov [ebp+4], eax ; 3,4 |
||
1460 | mov eax, [edi+9] |
||
1461 | mov [ebp+8], ax ; 5 |
||
1462 | mov eax, [edi+14] |
||
1463 | mov [ebp+10], eax ; 6,7 |
||
1464 | mov eax, [edi+18] |
||
1465 | mov [ebp+14], eax ; 8,9 |
||
1466 | mov eax, [edi+22] |
||
1467 | mov [ebp+18], eax ; 10,11 |
||
1468 | mov eax, [edi+28] |
||
1469 | mov [ebp+22], eax ; 12,13 |
||
1470 | ; ... done |
||
1471 | pop eax |
||
1472 | sub ebp, eax |
||
1473 | test eax, eax |
||
1474 | jz @f |
||
1475 | ; if this is not first entry, more processing required |
||
1476 | stc |
||
1477 | ret |
||
1478 | @@: |
||
1479 | ; if this is first entry: |
||
1480 | test byte [ebp-4], 1 |
||
1481 | jnz .ret |
||
1482 | ; buffer at ebp contains UNICODE name, convert it to ANSI |
||
1483 | push esi edi |
||
1484 | mov esi, ebp |
||
1485 | mov edi, ebp |
||
1486 | call uni2ansi_str |
||
1487 | pop edi esi |
||
1488 | .ret: |
||
1489 | clc |
||
1490 | ret |
||
1491 | |||
1492 | fat_compare_name: |
||
1493 | ; compares ASCIIZ-names, case-insensitive (cp866 encoding) |
||
1494 | ; in: esi->name, ebp->name |
||
1495 | ; out: if names match: ZF=1 and esi->next component of name |
||
1496 | ; else: ZF=0, esi is not changed |
||
1497 | ; destroys eax |
||
1498 | push ebp esi |
||
1499 | .loop: |
||
1500 | mov al, [ebp] |
||
1501 | inc ebp |
||
1502 | call char_toupper |
||
1503 | push eax |
||
1504 | lodsb |
||
1505 | call char_toupper |
||
1506 | cmp al, [esp] |
||
1507 | jnz .done |
||
1508 | pop eax |
||
1509 | test al, al |
||
1510 | jnz .loop |
||
1511 | dec esi |
||
1512 | pop eax |
||
1513 | pop ebp |
||
1514 | xor eax, eax ; set ZF flag |
||
1515 | ret |
||
1516 | .done: |
||
1517 | cmp al, '/' |
||
1518 | jnz @f |
||
1519 | cmp byte [esp], 0 |
||
1520 | jnz @f |
||
1521 | mov [esp+4], esi |
||
1522 | @@: |
||
1523 | pop eax |
||
1524 | pop esi ebp |
||
1525 | ret |
||
1526 | |||
1527 | fat_find_lfn: |
||
1528 | ; in: esi->name |
||
1529 | ; [esp+4] = next |
||
1530 | ; [esp+8] = first |
||
1531 | ; [esp+C]... - possibly parameters for first and next |
||
1532 | ; out: CF=1 - file not found, eax=error code |
||
1533 | ; else CF=0, esi->next name component, edi->direntry |
||
1534 | pusha |
||
1535 | lea eax, [esp+0Ch+20h] |
||
1536 | call dword [eax-4] |
||
1537 | jc .reterr |
||
1538 | sub esp, 262*2 ; reserve place for LFN |
||
1539 | push 0 ; for fat_get_name: read ASCII name |
||
1540 | .l1: |
||
1541 | lea ebp, [esp+4] |
||
1542 | call fat_get_name |
||
1543 | jc .l2 |
||
1544 | call fat_compare_name |
||
1545 | jz .found |
||
1546 | .l2: |
||
1547 | mov ebp, [esp+8+262*2+4] |
||
1548 | lea eax, [esp+0Ch+20h+262*2+4] |
||
1549 | call dword [eax-8] |
||
1550 | jnc .l1 |
||
1551 | add esp, 262*2+4 |
||
1552 | .reterr: |
||
1553 | mov [esp+28], eax |
||
1554 | stc |
||
1555 | popa |
||
1556 | ret |
||
1557 | .found: |
||
1558 | add esp, 262*2+4 |
||
1559 | mov ebp, [esp+8] |
||
1560 | ; if this is LFN entry, advance to true entry |
||
1561 | cmp byte [edi+11], 0xF |
||
1562 | jnz @f |
||
1563 | lea eax, [esp+0Ch+20h] |
||
1564 | call dword [eax-8] |
||
1565 | jc .reterr |
||
1566 | @@: |
||
1567 | add esp, 8 ; CF=0 |
||
1568 | push esi |
||
1569 | push edi |
||
1570 | popa |
||
1571 | ret |
||
1572 | |||
1573 | fat_time_to_bdfe: |
||
1574 | ; in: eax=FAT time |
||
1575 | ; out: eax=BDFE time |
||
1576 | push ecx edx |
||
1577 | mov ecx, eax |
||
1578 | mov edx, eax |
||
1579 | shr eax, 11 |
||
1580 | shl eax, 16 ; hours |
||
1581 | and edx, 0x1F |
||
1582 | add edx, edx |
||
1583 | mov al, dl ; seconds |
||
1584 | shr ecx, 5 |
||
1585 | and ecx, 0x3F |
||
1586 | mov ah, cl ; minutes |
||
1587 | pop edx ecx |
||
1588 | ret |
||
1589 | |||
1590 | fat_date_to_bdfe: |
||
1591 | push ecx edx |
||
1592 | mov ecx, eax |
||
1593 | mov edx, eax |
||
1594 | shr eax, 9 |
||
1595 | add ax, 1980 |
||
1596 | shl eax, 16 ; year |
||
1597 | and edx, 0x1F |
||
1598 | mov al, dl ; day |
||
1599 | shr ecx, 5 |
||
1600 | and ecx, 0xF |
||
1601 | mov ah, cl ; month |
||
1602 | pop edx ecx |
||
1603 | ret |
||
1604 | |||
1605 | bdfe_to_fat_time: |
||
1606 | push edx |
||
1607 | mov edx, eax |
||
1608 | shr eax, 16 |
||
1609 | and dh, 0x3F |
||
1610 | shl eax, 6 |
||
1611 | or al, dh |
||
1612 | shr dl, 1 |
||
1613 | and dl, 0x1F |
||
1614 | shl eax, 5 |
||
1615 | or al, dl |
||
1616 | pop edx |
||
1617 | ret |
||
1618 | |||
1619 | bdfe_to_fat_date: |
||
1620 | push edx |
||
1621 | mov edx, eax |
||
1622 | shr eax, 16 |
||
1623 | sub ax, 1980 |
||
1624 | and dh, 0xF |
||
1625 | shl eax, 4 |
||
1626 | or al, dh |
||
1627 | and dl, 0x1F |
||
1628 | shl eax, 5 |
||
1629 | or al, dl |
||
1630 | pop edx |
||
1631 | ret |
||
1632 | |||
1633 | fat_entry_to_bdfe: |
||
1634 | ; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi |
||
1635 | ; destroys eax |
||
1636 | mov eax, [ebp-4] |
||
1637 | mov [esi+4], eax ; ASCII/UNICODE name |
||
1638 | fat_entry_to_bdfe2: |
||
1639 | movzx eax, byte [edi+11] |
||
1640 | mov [esi], eax ; attributes |
||
1641 | movzx eax, word [edi+14] |
||
1642 | call fat_time_to_bdfe |
||
1643 | mov [esi+8], eax ; creation time |
||
1644 | movzx eax, word [edi+16] |
||
1645 | call fat_date_to_bdfe |
||
1646 | mov [esi+12], eax ; creation date |
||
1647 | and dword [esi+16], 0 ; last access time is not supported on FAT |
||
1648 | movzx eax, word [edi+18] |
||
1649 | call fat_date_to_bdfe |
||
1650 | mov [esi+20], eax ; last access date |
||
1651 | movzx eax, word [edi+22] |
||
1652 | call fat_time_to_bdfe |
||
1653 | mov [esi+24], eax ; last write time |
||
1654 | movzx eax, word [edi+24] |
||
1655 | call fat_date_to_bdfe |
||
1656 | mov [esi+28], eax ; last write date |
||
1657 | mov eax, [edi+28] |
||
1658 | mov [esi+32], eax ; file size (low dword) |
||
1659 | xor eax, eax |
||
1660 | mov [esi+36], eax ; file size (high dword) |
||
1661 | test ebp, ebp |
||
1662 | jz .ret |
||
1663 | push ecx edi |
||
1664 | lea edi, [esi+40] |
||
1665 | mov esi, ebp |
||
1666 | test byte [esi-4], 1 |
||
1667 | jz .ansi |
||
1668 | mov ecx, 260/2 |
||
1669 | rep movsd |
||
1670 | mov [edi-2], ax |
||
1671 | @@: |
||
1672 | mov esi, edi |
||
1673 | pop edi ecx |
||
1674 | .ret: |
||
1675 | ret |
||
1676 | .ansi: |
||
1677 | mov ecx, 264/4 |
||
1678 | rep movsd |
||
1679 | mov [edi-1], al |
||
1680 | jmp @b |
||
1681 | |||
1682 | bdfe_to_fat_entry: |
||
1683 | ; convert BDFE at edx to FAT entry at edi |
||
1684 | ; destroys eax |
||
1685 | ; attributes byte |
||
1686 | test byte [edi+11], 8 ; volume label? |
||
1687 | jnz @f |
||
1688 | mov al, [edx] |
||
1689 | and al, 0x27 |
||
1690 | and byte [edi+11], 0x10 |
||
1691 | or byte [edi+11], al |
||
1692 | @@: |
||
1693 | mov eax, [edx+8] |
||
1694 | call bdfe_to_fat_time |
||
1695 | mov [edi+14], ax ; creation time |
||
1696 | mov eax, [edx+12] |
||
1697 | call bdfe_to_fat_date |
||
1698 | mov [edi+16], ax ; creation date |
||
1699 | mov eax, [edx+20] |
||
1700 | call bdfe_to_fat_date |
||
1701 | mov [edi+18], ax ; last access date |
||
1702 | mov eax, [edx+24] |
||
1703 | call bdfe_to_fat_time |
||
1704 | mov [edi+22], ax ; last write time |
||
1705 | mov eax, [edx+28] |
||
1706 | call bdfe_to_fat_date |
||
1707 | mov [edi+24], ax ; last write date |
||
1708 | ret |
||
1709 | |||
1710 | hd_find_lfn: |
||
1711 | ; in: ebp -> FAT structure |
||
1712 | ; in: esi+[esp+4] -> name |
||
1713 | ; out: CF=1 - file not found, eax=error code |
||
1714 | ; else CF=0 and edi->direntry, eax=sector |
||
1715 | ; destroys eax |
||
1716 | push esi edi |
||
1717 | push 0 |
||
1718 | push 0 |
||
1719 | push fat1x_root_first |
||
1720 | push fat1x_root_next |
||
1721 | mov eax, [ebp+FAT.ROOT_CLUSTER] |
||
1722 | cmp [ebp+FAT.fs_type], 32 |
||
1723 | jz .fat32 |
||
1724 | .loop: |
||
1725 | and [ebp+FAT.longname_sec1], 0 |
||
1726 | and [ebp+FAT.longname_sec2], 0 |
||
1727 | call fat_find_lfn |
||
1728 | jc .notfound |
||
1729 | cmp byte [esi], 0 |
||
1730 | jz .found |
||
1731 | .continue: |
||
1732 | test byte [edi+11], 10h |
||
1733 | jz .notfound |
||
1734 | and dword [esp+12], 0 |
||
1735 | mov eax, [edi+20-2] |
||
1736 | mov ax, [edi+26] ; cluster |
||
1737 | .fat32: |
||
1738 | mov [esp+8], eax |
||
1739 | mov dword [esp+4], fat_notroot_first |
||
1740 | mov dword [esp], fat_notroot_next |
||
1741 | jmp .loop |
||
1742 | .notfound: |
||
1743 | add esp, 16 |
||
1744 | pop edi esi |
||
1745 | stc |
||
1746 | ret 4 |
||
1747 | .found: |
||
1748 | lea eax, [esp+4+24] |
||
1749 | cmp dword [eax], 0 |
||
1750 | jz @f |
||
1751 | mov esi, [eax] |
||
1752 | and dword [eax], 0 |
||
1753 | jmp .continue |
||
1754 | @@: |
||
1755 | lea eax, [esp+8] |
||
1756 | cmp dword [eax], 0 |
||
1757 | jz .root |
||
1758 | call fat_get_sector |
||
1759 | jmp .cmn |
||
1760 | .root: |
||
1761 | mov eax, [eax+4] |
||
1762 | add eax, [ebp+FAT.ROOT_START] |
||
1763 | .cmn: |
||
1764 | add esp, 20 ; CF=0 |
||
1765 | pop esi |
||
1766 | ret 4 |
||
1767 | |||
1768 | ;---------------------------------------------------------------- |
||
1769 | ; fat_Read - FAT implementation of reading a file |
||
1770 | ; in: ebp = pointer to FAT structure |
||
1771 | ; in: esi+[esp+4] = name |
||
1772 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
1773 | ; out: eax, ebx = return values for sysfunc 70 |
||
1774 | ;---------------------------------------------------------------- |
||
1775 | fat_Read: |
||
1776 | call fat_lock |
||
1777 | push edi |
||
1778 | cmp byte [esi], 0 |
||
1779 | jnz @f |
||
1780 | .noaccess: |
||
1781 | pop edi |
||
1782 | call fat_unlock |
||
1783 | or ebx, -1 |
||
1784 | mov eax, ERROR_ACCESS_DENIED |
||
1785 | ret |
||
1786 | @@: |
||
5594 | serge | 1787 | stdcall hd_find_lfn, [esp+8] |
4287 | Serge | 1788 | jnc .found |
1789 | pop edi |
||
1790 | push eax |
||
1791 | call fat_unlock |
||
1792 | pop eax |
||
1793 | or ebx, -1 |
||
1794 | ret |
||
1795 | .found: |
||
5594 | serge | 1796 | test byte [edi+11], 0x10 ; do not allow read directories |
4287 | Serge | 1797 | jnz .noaccess |
1798 | cmp dword [ebx+8], 0 |
||
1799 | jz @f |
||
1800 | xor ebx, ebx |
||
1801 | call fat_unlock |
||
1802 | mov eax, ERROR_END_OF_FILE |
||
1803 | pop edi |
||
1804 | ret |
||
1805 | @@: |
||
5594 | serge | 1806 | mov edx, [ebx+4] ; file offset |
4287 | Serge | 1807 | mov ecx, [ebx+12] ; size |
5594 | serge | 1808 | mov ebx, [ebx+16] ; buffer |
1809 | push ebx |
||
4287 | Serge | 1810 | push 0 |
1811 | mov eax, [edi+28] |
||
5594 | serge | 1812 | sub eax, edx |
1813 | jb .fileEnd |
||
4287 | Serge | 1814 | cmp eax, ecx |
1815 | jae @f |
||
1816 | mov ecx, eax |
||
1817 | mov byte [esp], 6 |
||
1818 | @@: |
||
1819 | mov eax, [edi+20-2] |
||
1820 | mov ax, [edi+26] |
||
5594 | serge | 1821 | ; now eax=cluster, ebx=buffer for data, ecx=count, edx=position |
1822 | mov edi, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
1823 | shl edi, 9 |
||
1824 | @@: |
||
4287 | Serge | 1825 | cmp eax, 2 |
5594 | serge | 1826 | jb .fileEnd |
4287 | Serge | 1827 | cmp eax, [ebp+FAT.fatRESERVED] |
5594 | serge | 1828 | jae .fileEnd |
1829 | sub edx, edi |
||
1830 | jc @f |
||
1831 | call get_FAT |
||
1832 | jc .noaccess2 |
||
1833 | jmp @b |
||
1834 | @@: |
||
1835 | mov esi, eax |
||
4287 | Serge | 1836 | dec eax |
1837 | dec eax |
||
5594 | serge | 1838 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
4287 | Serge | 1839 | add eax, [ebp+FAT.DATA_START] |
5594 | serge | 1840 | add edx, edi |
1841 | jz .alignedCluster |
||
1842 | mov edi, edx |
||
1843 | shr edi, 9 |
||
1844 | add eax, edi |
||
1845 | and edx, 511 |
||
5984 | serge | 1846 | cmp ecx, 512 |
1847 | jc .sectorPiece |
||
1848 | test edx, edx |
||
5594 | serge | 1849 | jz .alignedSector |
1850 | .sectorPiece: |
||
4287 | Serge | 1851 | push eax ebx |
1852 | lea ebx, [ebp+FAT.buffer] |
||
1853 | call fs_read32_app |
||
1854 | test eax, eax |
||
1855 | mov eax, ebx |
||
1856 | pop ebx |
||
5594 | serge | 1857 | jne .noaccess3 |
1858 | add eax, edx |
||
4287 | Serge | 1859 | push ecx |
5594 | serge | 1860 | add ecx, edx |
4287 | Serge | 1861 | cmp ecx, 512 |
1862 | jbe @f |
||
1863 | mov ecx, 512 |
||
1864 | @@: |
||
5594 | serge | 1865 | sub ecx, edx |
4287 | Serge | 1866 | call memmove |
1867 | sub [esp], ecx |
||
5594 | serge | 1868 | add ebx, ecx |
1869 | pop ecx eax |
||
1870 | xor edx, edx |
||
1871 | inc edi |
||
4287 | Serge | 1872 | inc eax |
5594 | serge | 1873 | test ecx, ecx |
1874 | jz .done |
||
1875 | .alignedSector: |
||
1876 | shl edi, 9 |
||
1877 | add ecx, edi |
||
1878 | mov edi, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
1879 | shl edi, 9 |
||
1880 | .alignedCluster: |
||
1881 | cmp ecx, 512 |
||
1882 | jc .sectorPiece |
||
1883 | mov edx, eax |
||
1884 | mov eax, esi |
||
1885 | @@: |
||
1886 | sub ecx, edi |
||
1887 | jbe .readEnd |
||
4287 | Serge | 1888 | call get_FAT |
5594 | serge | 1889 | jc .noaccess4 |
1890 | cmp eax, 2 |
||
1891 | jb .fileEnd2 |
||
1892 | cmp eax, [ebp+FAT.fatRESERVED] |
||
1893 | jae .fileEnd2 |
||
1894 | inc esi |
||
1895 | cmp eax, esi |
||
1896 | jz @b |
||
1897 | .fragmentEnd: |
||
1898 | xchg eax, esi |
||
1899 | dec eax |
||
1900 | dec eax |
||
1901 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
1902 | add eax, [ebp+FAT.DATA_START] |
||
1903 | push ecx |
||
1904 | mov ecx, eax |
||
5984 | serge | 1905 | mov eax, esi |
1906 | dec eax |
||
1907 | dec eax |
||
1908 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
1909 | add eax, [ebp+FAT.DATA_START] |
||
1910 | push eax |
||
1911 | .readFragment: |
||
1912 | sub ecx, edx |
||
5594 | serge | 1913 | mov eax, edx |
1914 | xor edx, edx |
||
1915 | call fs_read64_app |
||
1916 | shl ecx, 9 |
||
1917 | add ebx, ecx |
||
1918 | test eax, eax |
||
4287 | Serge | 1919 | pop eax |
5594 | serge | 1920 | jnz .noaccess3 |
1921 | pop ecx |
||
1922 | xor edx, edx |
||
1923 | jcxz .done |
||
1924 | jmp .alignedCluster |
||
1925 | .readEnd: |
||
1926 | add ecx, edi |
||
1927 | mov edi, ecx |
||
1928 | and ecx, 511 |
||
1929 | shr edi, 9 |
||
1930 | dec eax |
||
1931 | dec eax |
||
1932 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
1933 | add eax, [ebp+FAT.DATA_START] |
||
1934 | add eax, edi |
||
5984 | serge | 1935 | push ecx |
1936 | push eax |
||
1937 | mov ecx, eax |
||
5594 | serge | 1938 | jmp .readFragment |
1939 | .noaccess3: |
||
4287 | Serge | 1940 | pop eax |
5594 | serge | 1941 | .noaccess2: |
1942 | mov byte [esp], ERROR_DEVICE |
||
4287 | Serge | 1943 | .done: |
1944 | call fat_unlock |
||
1945 | pop eax edx edi |
||
1946 | sub ebx, edx |
||
1947 | ret |
||
5594 | serge | 1948 | .fileEnd: |
1949 | mov byte [esp], ERROR_END_OF_FILE |
||
1950 | jmp .done |
||
1951 | .noaccess4: |
||
1952 | mov byte [esp], ERROR_DEVICE |
||
1953 | jmp @f |
||
1954 | .fileEnd2: |
||
1955 | mov byte [esp], ERROR_END_OF_FILE |
||
1956 | @@: |
||
1957 | inc esi |
||
1958 | xor ecx, ecx |
||
1959 | jmp .fragmentEnd |
||
4287 | Serge | 1960 | |
1961 | ;---------------------------------------------------------------- |
||
1962 | ; fat_ReadFolder - FAT implementation of reading a folder |
||
1963 | ; in: ebp = pointer to FAT structure |
||
1964 | ; in: esi+[esp+4] = name |
||
1965 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
1966 | ; out: eax, ebx = return values for sysfunc 70 |
||
1967 | ;---------------------------------------------------------------- |
||
1968 | fat_ReadFolder: |
||
1969 | call fat_lock |
||
1970 | mov eax, [ebp+FAT.ROOT_CLUSTER] |
||
1971 | push edi |
||
1972 | cmp byte [esi], 0 |
||
1973 | jz .doit |
||
1974 | stdcall hd_find_lfn, [esp+4+4] |
||
1975 | jnc .found |
||
1976 | pop edi |
||
1977 | push eax |
||
1978 | call fat_unlock |
||
1979 | pop eax |
||
1980 | or ebx, -1 |
||
1981 | ret |
||
1982 | .found: |
||
1983 | test byte [edi+11], 0x10 ; do not allow read files |
||
1984 | jnz .found_dir |
||
1985 | pop edi |
||
1986 | call fat_unlock |
||
1987 | or ebx, -1 |
||
1988 | mov eax, ERROR_ACCESS_DENIED |
||
1989 | ret |
||
1990 | .found_dir: |
||
1991 | mov eax, [edi+20-2] |
||
1992 | mov ax, [edi+26] ; eax=cluster |
||
1993 | .doit: |
||
1994 | push esi |
||
1995 | sub esp, 262*2 ; reserve space for LFN |
||
1996 | push dword [ebx+8] ; for fat_get_name: read ANSI/UNICODE name |
||
1997 | mov edx, [ebx+16] ; pointer to buffer |
||
1998 | ; init header |
||
1999 | push eax |
||
2000 | mov edi, edx |
||
2001 | mov ecx, 32/4 |
||
2002 | xor eax, eax |
||
2003 | rep stosd |
||
2004 | pop eax |
||
2005 | mov byte [edx], 1 ; version |
||
2006 | mov esi, edi ; esi points to BDFE |
||
2007 | mov ecx, [ebx+12] ; number of blocks to read |
||
2008 | mov ebx, [ebx+4] ; index of the first block |
||
2009 | .new_cluster: |
||
2010 | mov [ebp+FAT.cluster_tmp], eax |
||
2011 | test eax, eax |
||
2012 | jnz @f |
||
2013 | cmp [ebp+FAT.fs_type], 32 |
||
2014 | jz .notfound |
||
2015 | mov eax, [ebp+FAT.ROOT_START] |
||
2016 | push [ebp+FAT.ROOT_SECTORS] |
||
2017 | push ebx |
||
2018 | jmp .new_sector |
||
2019 | @@: |
||
2020 | dec eax |
||
2021 | dec eax |
||
2022 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2023 | push [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2024 | add eax, [ebp+FAT.DATA_START] |
||
2025 | push ebx |
||
2026 | .new_sector: |
||
2027 | lea ebx, [ebp+FAT.buffer] |
||
2028 | mov edi, ebx |
||
2029 | push eax |
||
2030 | call fs_read32_sys |
||
2031 | test eax, eax |
||
2032 | pop eax |
||
2033 | jnz .notfound2 |
||
2034 | add ebx, 512 |
||
2035 | push eax |
||
2036 | .l1: |
||
2037 | push ebp |
||
2038 | lea ebp, [esp+20] |
||
2039 | call fat_get_name |
||
2040 | pop ebp |
||
2041 | jc .l2 |
||
2042 | cmp byte [edi+11], 0xF |
||
2043 | jnz .do_bdfe |
||
2044 | add edi, 0x20 |
||
2045 | cmp edi, ebx |
||
2046 | jb .do_bdfe |
||
2047 | pop eax |
||
2048 | inc eax |
||
2049 | dec dword [esp+4] |
||
2050 | jnz @f |
||
2051 | mov eax, [ebp+FAT.cluster_tmp] |
||
2052 | test eax, eax |
||
2053 | jz .done |
||
2054 | call get_FAT |
||
2055 | jc .notfound2 |
||
2056 | cmp eax, 2 |
||
2057 | jb .done |
||
2058 | cmp eax, [ebp+FAT.fatRESERVED] |
||
2059 | jae .done |
||
2060 | push eax |
||
2061 | mov eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2062 | mov [esp+8], eax |
||
2063 | pop eax |
||
2064 | mov [ebp+FAT.cluster_tmp], eax |
||
2065 | dec eax |
||
2066 | dec eax |
||
2067 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2068 | add eax, [ebp+FAT.DATA_START] |
||
2069 | @@: |
||
2070 | lea ebx, [ebp+FAT.buffer] |
||
2071 | mov edi, ebx |
||
2072 | push eax |
||
2073 | call fs_read32_sys |
||
2074 | test eax, eax |
||
2075 | pop eax |
||
2076 | jnz .notfound2 |
||
2077 | add ebx, 512 |
||
2078 | push eax |
||
2079 | .do_bdfe: |
||
2080 | inc dword [edx+8] ; new file found |
||
2081 | dec dword [esp+4] |
||
2082 | jns .l2 |
||
2083 | dec ecx |
||
2084 | js .l2 |
||
2085 | inc dword [edx+4] ; new file block copied |
||
2086 | push ebp |
||
2087 | lea ebp, [esp+20] |
||
2088 | call fat_entry_to_bdfe |
||
2089 | pop ebp |
||
2090 | .l2: |
||
2091 | add edi, 0x20 |
||
2092 | cmp edi, ebx |
||
2093 | jb .l1 |
||
2094 | pop eax |
||
2095 | inc eax |
||
2096 | dec dword [esp+4] |
||
2097 | jnz .new_sector |
||
2098 | mov eax, [ebp+FAT.cluster_tmp] |
||
2099 | test eax, eax |
||
2100 | jz .done |
||
2101 | call get_FAT |
||
2102 | jc .notfound2 |
||
2103 | cmp eax, 2 |
||
2104 | jb .done |
||
2105 | cmp eax, [ebp+FAT.fatRESERVED] |
||
2106 | jae .done |
||
2107 | push eax |
||
2108 | mov eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2109 | mov [esp+8], eax |
||
2110 | pop eax |
||
2111 | pop ebx |
||
2112 | add esp, 4 |
||
2113 | jmp .new_cluster |
||
2114 | .notfound2: |
||
2115 | add esp, 8 |
||
2116 | .notfound: |
||
2117 | add esp, 262*2+4 |
||
2118 | pop esi edi |
||
2119 | mov ebx, [edx+4] |
||
2120 | call fat_unlock |
||
2121 | mov eax, ERROR_DEVICE |
||
2122 | ret |
||
2123 | .done: |
||
2124 | add esp, 262*2+4+8 |
||
2125 | mov ebx, [edx+4] |
||
2126 | xor eax, eax |
||
2127 | dec ecx |
||
2128 | js @f |
||
2129 | mov al, ERROR_END_OF_FILE |
||
2130 | @@: |
||
2131 | push eax |
||
2132 | call fat_unlock |
||
2133 | pop eax |
||
2134 | pop esi edi |
||
2135 | ret |
||
2136 | |||
2137 | fat1x_root_next: |
||
2138 | push ecx |
||
2139 | lea ecx, [ebp+FAT.buffer+0x200-0x20] |
||
2140 | cmp edi, ecx |
||
2141 | jae fat1x_root_next_sector |
||
2142 | pop ecx |
||
2143 | add edi, 0x20 |
||
2144 | ret ; CF=0 |
||
2145 | fat1x_root_next_sector: |
||
2146 | ; read next sector |
||
2147 | push [ebp+FAT.longname_sec2] |
||
2148 | pop [ebp+FAT.longname_sec1] |
||
2149 | mov ecx, [eax+4] |
||
2150 | push ecx |
||
2151 | add ecx, [ebp+FAT.ROOT_START] |
||
2152 | mov [ebp+FAT.longname_sec2], ecx |
||
2153 | pop ecx |
||
2154 | inc ecx |
||
2155 | mov [eax+4], ecx |
||
2156 | cmp ecx, [ebp+FAT.ROOT_SECTORS] |
||
2157 | pop ecx |
||
2158 | jb fat1x_root_first |
||
2159 | mov eax, ERROR_FILE_NOT_FOUND |
||
2160 | stc |
||
2161 | ret |
||
2162 | fat1x_root_first: |
||
2163 | mov eax, [eax+4] |
||
2164 | add eax, [ebp+FAT.ROOT_START] |
||
2165 | push ebx |
||
2166 | lea edi, [ebp+FAT.buffer] |
||
2167 | mov ebx, edi |
||
2168 | call fs_read32_sys |
||
2169 | pop ebx |
||
2170 | test eax, eax |
||
2171 | jnz .readerr |
||
2172 | ret ; CF=0 |
||
2173 | .readerr: |
||
2174 | mov eax, ERROR_DEVICE |
||
2175 | stc |
||
2176 | ret |
||
2177 | .notfound: |
||
2178 | mov eax, ERROR_FILE_NOT_FOUND |
||
2179 | stc |
||
2180 | ret |
||
2181 | fat1x_root_begin_write: |
||
2182 | push edi eax |
||
2183 | call fat1x_root_first |
||
2184 | pop eax edi |
||
2185 | ret |
||
2186 | fat1x_root_end_write: |
||
2187 | pusha |
||
2188 | mov eax, [eax+4] |
||
2189 | add eax, [ebp+FAT.ROOT_START] |
||
2190 | lea ebx, [ebp+FAT.buffer] |
||
2191 | call fs_write32_sys |
||
2192 | popa |
||
2193 | ret |
||
2194 | fat1x_root_next_write: |
||
2195 | push ecx |
||
2196 | lea ecx, [ebp+FAT.buffer+0x200] |
||
2197 | cmp edi, ecx |
||
2198 | jae @f |
||
2199 | pop ecx |
||
2200 | ret |
||
2201 | @@: |
||
2202 | call fat1x_root_end_write |
||
2203 | jmp fat1x_root_next_sector |
||
2204 | fat1x_root_extend_dir: |
||
2205 | stc |
||
2206 | ret |
||
2207 | |||
2208 | fat_notroot_next: |
||
2209 | push ecx |
||
2210 | lea ecx, [ebp+FAT.buffer+0x200-0x20] |
||
2211 | cmp edi, ecx |
||
2212 | jae fat_notroot_next_sector |
||
2213 | pop ecx |
||
2214 | add edi, 0x20 |
||
2215 | ret ; CF=0 |
||
2216 | fat_notroot_next_sector: |
||
2217 | push [ebp+FAT.longname_sec2] |
||
2218 | pop [ebp+FAT.longname_sec1] |
||
2219 | push eax |
||
2220 | call fat_get_sector |
||
2221 | mov [ebp+FAT.longname_sec2], eax |
||
2222 | pop eax |
||
2223 | mov ecx, [eax+4] |
||
2224 | inc ecx |
||
2225 | cmp ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2226 | jae fat_notroot_next_cluster |
||
2227 | mov [eax+4], ecx |
||
2228 | jmp @f |
||
2229 | fat_notroot_next_cluster: |
||
2230 | push eax |
||
2231 | mov eax, [eax] |
||
2232 | call get_FAT |
||
2233 | mov ecx, eax |
||
2234 | pop eax |
||
2235 | jc fat_notroot_first.deverr |
||
2236 | cmp ecx, 2 |
||
2237 | jb fat_notroot_next_err |
||
2238 | cmp ecx, [ebp+FAT.fatRESERVED] |
||
2239 | jae fat_notroot_next_err |
||
2240 | mov [eax], ecx |
||
2241 | and dword [eax+4], 0 |
||
2242 | @@: |
||
2243 | pop ecx |
||
2244 | fat_notroot_first: |
||
2245 | call fat_get_sector |
||
2246 | push ebx |
||
2247 | lea edi, [ebp+FAT.buffer] |
||
2248 | mov ebx, edi |
||
2249 | call fs_read32_sys |
||
2250 | pop ebx |
||
2251 | test eax, eax |
||
2252 | jz .ret ; CF=0 |
||
2253 | push ecx |
||
2254 | .deverr: |
||
2255 | pop ecx |
||
2256 | mov eax, ERROR_DEVICE |
||
2257 | stc |
||
2258 | .ret: |
||
2259 | ret |
||
2260 | fat_notroot_next_err: |
||
2261 | pop ecx |
||
2262 | mov eax, ERROR_FILE_NOT_FOUND |
||
2263 | stc |
||
2264 | ret |
||
2265 | fat_notroot_begin_write: |
||
2266 | push eax edi |
||
2267 | call fat_notroot_first |
||
2268 | pop edi eax |
||
2269 | ret |
||
2270 | fat_notroot_end_write: |
||
2271 | call fat_get_sector |
||
2272 | push ebx |
||
2273 | lea ebx, [ebp+FAT.buffer] |
||
2274 | call fs_write32_sys |
||
2275 | pop ebx |
||
2276 | ret |
||
2277 | fat_notroot_next_write: |
||
2278 | push ecx |
||
2279 | lea ecx, [ebp+FAT.buffer+0x200] |
||
2280 | cmp edi, ecx |
||
2281 | jae @f |
||
2282 | pop ecx |
||
2283 | ret |
||
2284 | @@: |
||
2285 | push eax |
||
2286 | call fat_notroot_end_write |
||
2287 | pop eax |
||
2288 | jmp fat_notroot_next_sector |
||
2289 | fat_notroot_extend_dir: |
||
2290 | push eax |
||
2291 | call get_free_FAT |
||
2292 | jnc .found |
||
2293 | pop eax |
||
2294 | ret ; CF=1 |
||
2295 | .found: |
||
2296 | push edx |
||
2297 | mov edx, [ebp+FAT.fatEND] |
||
2298 | call set_FAT |
||
2299 | jc .writeerr |
||
2300 | mov edx, eax |
||
2301 | mov eax, [esp+4] |
||
2302 | mov eax, [eax] |
||
2303 | push edx |
||
2304 | call set_FAT |
||
2305 | pop edx |
||
2306 | jnc @f |
||
2307 | .writeerr: |
||
2308 | pop edx |
||
2309 | pop eax |
||
2310 | stc |
||
2311 | ret |
||
2312 | @@: |
||
2313 | push ecx |
||
2314 | or ecx, -1 |
||
2315 | call add_disk_free_space |
||
2316 | ; zero new cluster |
||
2317 | mov ecx, 512/4 |
||
2318 | lea edi, [ebp+FAT.buffer] |
||
2319 | push edi |
||
2320 | xor eax, eax |
||
2321 | rep stosd |
||
2322 | pop edi |
||
2323 | pop ecx |
||
2324 | mov eax, [esp+4] |
||
2325 | mov [eax], edx |
||
2326 | and dword [eax+4], 0 |
||
2327 | pop edx |
||
2328 | mov eax, [eax] |
||
2329 | dec eax |
||
2330 | dec eax |
||
2331 | push ebx ecx |
||
2332 | mov ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2333 | imul eax, ecx |
||
2334 | add eax, [ebp+FAT.DATA_START] |
||
2335 | mov ebx, edi |
||
2336 | @@: |
||
2337 | push eax |
||
2338 | call fs_write32_sys |
||
2339 | pop eax |
||
2340 | inc eax |
||
2341 | loop @b |
||
2342 | pop ecx ebx eax |
||
2343 | clc |
||
2344 | ret |
||
2345 | |||
2346 | fat_get_sector: |
||
2347 | push ecx |
||
2348 | mov ecx, [eax] |
||
2349 | dec ecx |
||
2350 | dec ecx |
||
2351 | imul ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2352 | add ecx, [ebp+FAT.DATA_START] |
||
2353 | add ecx, [eax+4] |
||
2354 | mov eax, ecx |
||
2355 | pop ecx |
||
2356 | ret |
||
2357 | |||
2358 | fshrad: |
||
2359 | call fat_unlock |
||
2360 | mov eax, ERROR_ACCESS_DENIED |
||
2361 | xor ebx, ebx |
||
2362 | ret |
||
2363 | |||
2364 | ;---------------------------------------------------------------- |
||
2365 | ; fat_CreateFolder - FAT implementation of creating a folder |
||
2366 | ; in: ebp = pointer to FAT structure |
||
2367 | ; in: esi+[esp+4] = name |
||
2368 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
2369 | ; out: eax, ebx = return values for sysfunc 70 |
||
2370 | ;---------------------------------------------------------------- |
||
2371 | fat_CreateFolder: |
||
2372 | push 1 |
||
2373 | jmp fat_Rewrite.common |
||
2374 | |||
2375 | ;---------------------------------------------------------------- |
||
2376 | ; fat_Rewrite - FAT implementation of creating a new file |
||
2377 | ; in: ebp = pointer to FAT structure |
||
2378 | ; in: esi+[esp+4] = name |
||
2379 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
2380 | ; out: eax, ebx = return values for sysfunc 70 |
||
2381 | ;---------------------------------------------------------------- |
||
2382 | fat_Rewrite: |
||
2383 | push 0 |
||
2384 | .common: |
||
2385 | call fat_lock |
||
2386 | pop eax |
||
2387 | cmp byte [esi], 0 |
||
2388 | jz fshrad |
||
2389 | mov ecx, [ebx+12] |
||
2390 | mov edx, [ebx+16] |
||
2391 | pushad |
||
2392 | xor edi, edi |
||
2393 | mov edx, [esp+4+20h] |
||
2394 | push esi |
||
2395 | test edx, edx |
||
2396 | jz @f |
||
2397 | mov esi, edx |
||
2398 | @@: |
||
2399 | lodsb |
||
2400 | test al, al |
||
2401 | jz @f |
||
2402 | cmp al, '/' |
||
2403 | jnz @b |
||
2404 | lea edi, [esi-1] |
||
2405 | jmp @b |
||
2406 | @@: |
||
2407 | pop esi |
||
2408 | test edi, edi |
||
2409 | jnz .noroot |
||
2410 | test edx, edx |
||
2411 | jnz .hasebp |
||
2412 | mov edx, [ebp+FAT.ROOT_CLUSTER] |
||
2413 | cmp [ebp+FAT.fs_type], 32 |
||
2414 | jz .pushnotroot |
||
2415 | xor edx, edx |
||
2416 | push edx |
||
2417 | push fat1x_root_extend_dir |
||
2418 | push fat1x_root_end_write |
||
2419 | push fat1x_root_next_write |
||
2420 | push fat1x_root_begin_write |
||
2421 | push edx |
||
2422 | push edx |
||
2423 | push fat1x_root_first |
||
2424 | push fat1x_root_next |
||
2425 | jmp .common1 |
||
2426 | .hasebp: |
||
2427 | mov eax, ERROR_ACCESS_DENIED |
||
2428 | cmp byte [edx], 0 |
||
2429 | jz .ret1 |
||
2430 | stdcall hd_find_lfn, 0 |
||
2431 | mov esi, [esp+4+20h] |
||
2432 | jc .ret1 |
||
2433 | jmp .common0 |
||
2434 | .noroot: |
||
2435 | mov eax, ERROR_ACCESS_DENIED |
||
2436 | cmp byte [edi+1], 0 |
||
2437 | jz .ret1 |
||
2438 | ; check existence |
||
2439 | mov byte [edi], 0 |
||
2440 | push edi |
||
2441 | stdcall hd_find_lfn, [esp+4+24h] |
||
2442 | pop esi |
||
2443 | mov byte [esi], '/' |
||
2444 | jnc @f |
||
2445 | .notfound0: |
||
2446 | mov eax, ERROR_FILE_NOT_FOUND |
||
2447 | .ret1: |
||
2448 | mov [esp+28], eax |
||
2449 | call fat_unlock |
||
2450 | popad |
||
2451 | xor ebx, ebx |
||
2452 | ret |
||
2453 | @@: |
||
2454 | inc esi |
||
2455 | .common0: |
||
2456 | test byte [edi+11], 0x10 ; must be directory |
||
2457 | mov eax, ERROR_ACCESS_DENIED |
||
2458 | jz .ret1 |
||
2459 | mov edx, [edi+20-2] |
||
2460 | mov dx, [edi+26] ; ebp=cluster |
||
2461 | mov eax, ERROR_FAT_TABLE |
||
2462 | cmp edx, 2 |
||
2463 | jb .ret1 |
||
2464 | .pushnotroot: |
||
2465 | push edx |
||
2466 | push fat_notroot_extend_dir |
||
2467 | push fat_notroot_end_write |
||
2468 | push fat_notroot_next_write |
||
2469 | push fat_notroot_begin_write |
||
2470 | push 0 |
||
2471 | push edx |
||
2472 | push fat_notroot_first |
||
2473 | push fat_notroot_next |
||
2474 | .common1: |
||
2475 | call fat_find_lfn |
||
2476 | jc .notfound |
||
2477 | ; found |
||
2478 | test byte [edi+11], 10h |
||
2479 | jz .exists_file |
||
2480 | ; found directory; if we are creating directory, return OK, |
||
2481 | ; if we are creating file, say "access denied" |
||
2482 | add esp, 36 |
||
2483 | call fat_unlock |
||
2484 | popad |
||
2485 | test al, al |
||
2486 | mov eax, ERROR_ACCESS_DENIED |
||
2487 | jz @f |
||
2488 | mov al, 0 |
||
2489 | @@: |
||
2490 | xor ebx, ebx |
||
2491 | ret |
||
2492 | .exists_file: |
||
2493 | ; found file; if we are creating directory, return "access denied", |
||
2494 | ; if we are creating file, delete existing file and continue |
||
2495 | cmp byte [esp+36+28], 0 |
||
2496 | jz @f |
||
2497 | add esp, 36 |
||
2498 | call fat_unlock |
||
2499 | popad |
||
2500 | mov eax, ERROR_ACCESS_DENIED |
||
2501 | xor ebx, ebx |
||
2502 | ret |
||
2503 | @@: |
||
2504 | ; delete FAT chain |
||
2505 | push edi |
||
2506 | xor eax, eax |
||
2507 | mov dword [edi+28], eax ; zero size |
||
2508 | xor ecx, ecx |
||
2509 | mov eax, [edi+20-2] |
||
2510 | mov ax, [edi+26] |
||
2511 | mov word [edi+20], cx |
||
2512 | mov word [edi+26], cx |
||
2513 | test eax, eax |
||
2514 | jz .done1 |
||
2515 | @@: |
||
2516 | cmp eax, [ebp+FAT.fatRESERVED] |
||
2517 | jae .done1 |
||
2518 | push edx |
||
2519 | xor edx, edx |
||
2520 | call set_FAT |
||
2521 | mov eax, edx |
||
2522 | pop edx |
||
2523 | jc .done1 |
||
2524 | inc ecx |
||
2525 | jmp @b |
||
2526 | .done1: |
||
2527 | pop edi |
||
2528 | call get_time_for_file |
||
2529 | mov [edi+22], ax |
||
2530 | call get_date_for_file |
||
2531 | mov [edi+24], ax |
||
2532 | mov [edi+18], ax |
||
2533 | or byte [edi+11], 20h ; set 'archive' attribute |
||
2534 | jmp .doit |
||
2535 | .notfound: |
||
2536 | ; file is not found; generate short name |
||
2537 | call fat_name_is_legal |
||
2538 | jc @f |
||
2539 | add esp, 36 |
||
2540 | call fat_unlock |
||
2541 | popad |
||
2542 | mov eax, ERROR_FILE_NOT_FOUND |
||
2543 | xor ebx, ebx |
||
2544 | ret |
||
2545 | @@: |
||
2546 | sub esp, 12 |
||
2547 | mov edi, esp |
||
2548 | call fat_gen_short_name |
||
2549 | .test_short_name_loop: |
||
2550 | push esi edi ecx |
||
2551 | mov esi, edi |
||
2552 | lea eax, [esp+12+12+8] |
||
2553 | mov edx, [eax+24] |
||
2554 | mov [eax], edx |
||
2555 | and dword [eax+4], 0 |
||
2556 | call dword [eax-4] |
||
2557 | jc .found |
||
2558 | .test_short_name_entry: |
||
2559 | cmp byte [edi+11], 0xF |
||
2560 | jz .test_short_name_cont |
||
2561 | mov ecx, 11 |
||
2562 | push esi edi |
||
2563 | repz cmpsb |
||
2564 | pop edi esi |
||
2565 | jz .short_name_found |
||
2566 | .test_short_name_cont: |
||
2567 | lea eax, [esp+12+12+8] |
||
2568 | call dword [eax-8] |
||
2569 | jnc .test_short_name_entry |
||
2570 | jmp .found |
||
2571 | .short_name_found: |
||
2572 | pop ecx edi esi |
||
2573 | call fat_next_short_name |
||
2574 | jnc .test_short_name_loop |
||
2575 | .disk_full: |
||
2576 | add esp, 12+36 |
||
2577 | call fat_unlock |
||
2578 | popa |
||
2579 | mov eax, ERROR_DISK_FULL |
||
2580 | xor ebx, ebx |
||
2581 | ret |
||
2582 | .found: |
||
2583 | pop ecx edi esi |
||
2584 | ; now find space in directory |
||
2585 | ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' |
||
2586 | mov al, '~' |
||
2587 | push ecx edi |
||
2588 | mov ecx, 8 |
||
2589 | repnz scasb |
||
2590 | movi eax, 1 ; 1 entry |
||
2591 | jnz .notilde |
||
2592 | ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total |
||
2593 | xor eax, eax |
||
2594 | @@: |
||
2595 | cmp byte [esi], 0 |
||
2596 | jz @f |
||
2597 | inc esi |
||
2598 | inc eax |
||
2599 | jmp @b |
||
2600 | @@: |
||
2601 | sub esi, eax |
||
2602 | add eax, 12+13 |
||
2603 | mov ecx, 13 |
||
2604 | push edx |
||
2605 | cdq |
||
2606 | div ecx |
||
2607 | pop edx |
||
2608 | .notilde: |
||
2609 | push -1 |
||
2610 | push -1 |
||
2611 | push -1 |
||
2612 | ; find |
||
2613 | xor ecx, ecx |
||
2614 | push eax |
||
2615 | lea eax, [esp+16+8+12+8] |
||
2616 | mov edx, [eax+24] |
||
2617 | mov [eax], edx |
||
2618 | and dword [eax+4], 0 |
||
2619 | call dword [eax-4] |
||
2620 | pop eax |
||
2621 | jnc .scan_dir |
||
2622 | .fsfrfe3: |
||
2623 | add esp, 12+8+12+36 |
||
2624 | call fat_unlock |
||
2625 | popad |
||
2626 | mov eax, ERROR_DEVICE |
||
2627 | xor ebx, ebx |
||
2628 | ret |
||
2629 | .scan_dir: |
||
2630 | cmp byte [edi], 0 |
||
2631 | jz .free |
||
2632 | cmp byte [edi], 0xE5 |
||
2633 | jz .free |
||
2634 | xor ecx, ecx |
||
2635 | .scan_cont: |
||
2636 | push eax |
||
2637 | lea eax, [esp+16+8+12+8] |
||
2638 | call dword [eax-8] |
||
2639 | mov edx, eax |
||
2640 | pop eax |
||
2641 | jnc .scan_dir |
||
2642 | cmp edx, ERROR_DEVICE |
||
2643 | jz .fsfrfe3 |
||
2644 | push eax |
||
2645 | lea eax, [esp+16+8+12+8] |
||
2646 | call dword [eax+20] ; extend directory |
||
2647 | pop eax |
||
2648 | jnc .scan_dir |
||
2649 | add esp, 12+8+12+36 |
||
2650 | call fat_unlock |
||
2651 | popad |
||
2652 | mov eax, ERROR_DISK_FULL |
||
2653 | xor ebx, ebx |
||
2654 | ret |
||
2655 | .free: |
||
2656 | test ecx, ecx |
||
2657 | jnz @f |
||
2658 | mov [esp], edi |
||
2659 | mov ecx, [esp+12+8+12+8] |
||
2660 | mov [esp+4], ecx |
||
2661 | mov ecx, [esp+12+8+12+12] |
||
2662 | mov [esp+8], ecx |
||
2663 | xor ecx, ecx |
||
2664 | @@: |
||
2665 | inc ecx |
||
2666 | cmp ecx, eax |
||
2667 | jb .scan_cont |
||
2668 | ; found! |
||
2669 | push esi ecx |
||
2670 | ; If creating a directory, allocate one data cluster now and fail immediately |
||
2671 | ; if this is impossible. This prevents from creating an invalid directory entry |
||
2672 | ; on a full disk. |
||
2673 | ; yup, the argument is quite non-intuitive... but what should I do if |
||
2674 | ; the entire function uses such arguments? BTW, it refers to al from pushad, |
||
2675 | ; which in turn is filled with 0 in fat_Rewrite and 1 in fat_CreateFolder. |
||
2676 | cmp byte [esp+8+12+8+12+36+28], 0 |
||
2677 | jz .no.preallocate.folder.data |
||
2678 | call get_free_FAT |
||
2679 | jnc @f |
||
2680 | add esp, 8+12+8 |
||
2681 | jmp .disk_full |
||
2682 | @@: |
||
2683 | mov [esp+8+12+8+12+36+20], eax ; store the cluster somewhere |
||
2684 | .no.preallocate.folder.data: |
||
2685 | ; calculate name checksum |
||
2686 | mov esi, [esp+8+12] |
||
2687 | mov ecx, 11 |
||
2688 | xor eax, eax |
||
2689 | @@: |
||
2690 | ror al, 1 |
||
2691 | add al, [esi] |
||
2692 | inc esi |
||
2693 | loop @b |
||
2694 | pop ecx esi |
||
2695 | pop edi |
||
2696 | pop dword [esp+8+12+12] |
||
2697 | pop dword [esp+8+12+12] |
||
2698 | ; edi points to first entry in free chunk |
||
2699 | dec ecx |
||
2700 | jz .nolfn |
||
2701 | push esi |
||
2702 | push eax |
||
2703 | lea eax, [esp+8+8+12+8] |
||
2704 | call dword [eax+8] ; begin write |
||
2705 | mov al, 40h |
||
2706 | .writelfn: |
||
2707 | or al, cl |
||
2708 | mov esi, [esp+4] |
||
2709 | push ecx |
||
2710 | dec ecx |
||
2711 | imul ecx, 13 |
||
2712 | add esi, ecx |
||
2713 | stosb |
||
2714 | mov cl, 5 |
||
2715 | call fat_read_symbols |
||
2716 | mov ax, 0xF |
||
2717 | stosw |
||
2718 | mov al, [esp+4] |
||
2719 | stosb |
||
2720 | mov cl, 6 |
||
2721 | call fat_read_symbols |
||
2722 | xor eax, eax |
||
2723 | stosw |
||
2724 | mov cl, 2 |
||
2725 | call fat_read_symbols |
||
2726 | pop ecx |
||
2727 | lea eax, [esp+8+8+12+8] |
||
2728 | call dword [eax+12] ; next write |
||
2729 | xor eax, eax |
||
2730 | loop .writelfn |
||
2731 | pop eax |
||
2732 | pop esi |
||
2733 | ; lea eax, [esp+8+12+8] |
||
2734 | ; call dword [eax+16] ; end write |
||
2735 | .nolfn: |
||
2736 | xchg esi, [esp] |
||
2737 | mov ecx, 11 |
||
2738 | rep movsb |
||
2739 | mov word [edi], 20h ; attributes |
||
2740 | sub edi, 11 |
||
2741 | pop esi ecx |
||
2742 | add esp, 12 |
||
2743 | mov byte [edi+13], 0 ; tenths of a second at file creation time |
||
2744 | call get_time_for_file |
||
2745 | mov [edi+14], ax ; creation time |
||
2746 | mov [edi+22], ax ; last write time |
||
2747 | call get_date_for_file |
||
2748 | mov [edi+16], ax ; creation date |
||
2749 | mov [edi+24], ax ; last write date |
||
2750 | mov [edi+18], ax ; last access date |
||
2751 | xor ecx, ecx |
||
2752 | mov word [edi+20], cx ; high word of cluster |
||
2753 | mov word [edi+26], cx ; low word of cluster - to be filled |
||
2754 | mov dword [edi+28], ecx ; file size - to be filled |
||
2755 | cmp byte [esp+36+28], cl |
||
2756 | jz .doit |
||
2757 | ; create directory |
||
2758 | mov byte [edi+11], 10h ; attributes: folder |
||
2759 | mov esi, edi |
||
2760 | lea eax, [esp+8] |
||
2761 | call dword [eax+16] ; flush directory |
||
2762 | mov eax, [esp+36+20] ; extract saved cluster |
||
2763 | mov [esp+36+20], edi ; this is needed for calculating arg of add_disk_free_space! |
||
2764 | push ecx |
||
2765 | mov ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2766 | shl ecx, 9 |
||
2767 | push ecx |
||
2768 | push edi |
||
2769 | jmp .doit2 |
||
2770 | .doit: |
||
2771 | mov esi, [esp+36+20] |
||
2772 | lea eax, [esp+8] |
||
2773 | call dword [eax+16] ; flush directory |
||
2774 | push ecx |
||
2775 | mov ecx, [esp+4+36+24] |
||
2776 | push ecx |
||
2777 | push edi |
||
2778 | test ecx, ecx |
||
2779 | jz .done |
||
2780 | call get_free_FAT |
||
2781 | jc .diskfull |
||
2782 | .doit2: |
||
2783 | push eax |
||
2784 | mov [edi+26], ax |
||
2785 | shr eax, 16 |
||
2786 | mov [edi+20], ax |
||
2787 | lea eax, [esp+16+8] |
||
2788 | call dword [eax+16] ; flush directory |
||
2789 | pop eax |
||
2790 | push edx |
||
2791 | mov edx, [ebp+FAT.fatEND] |
||
2792 | call set_FAT |
||
2793 | pop edx |
||
2794 | .write_cluster: |
||
2795 | push eax |
||
2796 | dec eax |
||
2797 | dec eax |
||
2798 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2799 | add eax, [ebp+FAT.DATA_START] |
||
2800 | push [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2801 | ; write data |
||
2802 | .write_sector: |
||
2803 | cmp byte [esp+20+36+28], 0 |
||
2804 | jnz .writedir |
||
2805 | mov ecx, 512 |
||
2806 | cmp dword [esp+12], ecx |
||
2807 | jb .writeshort |
||
2808 | ; we can write directly from given buffer |
||
2809 | mov ebx, esi |
||
2810 | add esi, ecx |
||
2811 | jmp .writecommon |
||
2812 | .writeshort: |
||
2813 | mov ecx, [esp+12] |
||
2814 | push ecx |
||
2815 | lea edi, [ebp+FAT.buffer] |
||
2816 | mov ebx, edi |
||
2817 | rep movsb |
||
2818 | .writedircont: |
||
2819 | lea ecx, [ebp+FAT.buffer+0x200] |
||
2820 | sub ecx, edi |
||
2821 | push eax |
||
2822 | xor eax, eax |
||
2823 | rep stosb |
||
2824 | pop eax |
||
2825 | pop ecx |
||
2826 | .writecommon: |
||
2827 | push eax |
||
2828 | call fs_write32_app |
||
2829 | test eax, eax |
||
2830 | pop eax |
||
2831 | jnz .writeerr |
||
2832 | inc eax |
||
2833 | sub dword [esp+12], ecx |
||
2834 | jz .writedone |
||
2835 | dec dword [esp] |
||
2836 | jnz .write_sector |
||
2837 | pop eax |
||
2838 | ; allocate new cluster |
||
2839 | pop eax |
||
2840 | mov ecx, eax |
||
2841 | call get_free_FAT |
||
2842 | jc .diskfull |
||
2843 | push edx |
||
2844 | mov edx, [ebp+FAT.fatEND] |
||
2845 | call set_FAT |
||
2846 | xchg eax, ecx |
||
2847 | mov edx, ecx |
||
2848 | call set_FAT |
||
2849 | pop edx |
||
2850 | xchg eax, ecx |
||
2851 | jmp .write_cluster |
||
2852 | .diskfull: |
||
2853 | mov eax, ERROR_DISK_FULL |
||
2854 | jmp .ret |
||
2855 | .writeerr: |
||
2856 | pop eax eax |
||
2857 | sub esi, ecx |
||
2858 | mov eax, ERROR_DEVICE |
||
2859 | jmp .ret |
||
2860 | .writedone: |
||
2861 | pop eax eax |
||
2862 | .done: |
||
2863 | xor eax, eax |
||
2864 | .ret: |
||
2865 | pop edi ecx |
||
2866 | sub esi, [esp+4+36+20] |
||
2867 | mov [esp+4+36+28], eax |
||
2868 | mov [esp+4+36+16], esi |
||
2869 | lea eax, [esp+12] |
||
2870 | call dword [eax+8] |
||
2871 | mov [edi+28], esi |
||
2872 | call dword [eax+16] |
||
2873 | mov [esp+36+16], ebx |
||
2874 | lea eax, [esi+511] |
||
2875 | shr eax, 9 |
||
2876 | mov ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2877 | lea eax, [eax+ecx-1] |
||
2878 | xor edx, edx |
||
2879 | div ecx |
||
2880 | pop ecx |
||
2881 | sub ecx, eax |
||
2882 | call add_disk_free_space |
||
2883 | add esp, 36 |
||
2884 | call update_disk |
||
2885 | call fat_unlock |
||
2886 | popad |
||
2887 | ret |
||
2888 | .writedir: |
||
2889 | push 512 |
||
2890 | lea edi, [ebp+FAT.buffer] |
||
2891 | mov ebx, edi |
||
2892 | mov ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
2893 | shl ecx, 9 |
||
2894 | cmp ecx, [esp+16] |
||
2895 | jnz .writedircont |
||
2896 | dec dword [esp+20] |
||
2897 | push esi |
||
2898 | mov ecx, 32/4 |
||
2899 | rep movsd |
||
2900 | pop esi |
||
2901 | mov dword [edi-32], '. ' |
||
2902 | mov dword [edi-32+4], ' ' |
||
2903 | mov dword [edi-32+8], ' ' |
||
2904 | mov byte [edi-32+11], 10h |
||
2905 | push esi |
||
2906 | mov ecx, 32/4 |
||
2907 | rep movsd |
||
2908 | pop esi |
||
2909 | mov dword [edi-32], '.. ' |
||
2910 | mov dword [edi-32+4], ' ' |
||
2911 | mov dword [edi-32+8], ' ' |
||
2912 | mov byte [edi-32+11], 10h |
||
2913 | mov ecx, [esp+20+36] |
||
2914 | cmp ecx, [ebp+FAT.ROOT_CLUSTER] |
||
2915 | jnz @f |
||
2916 | xor ecx, ecx |
||
2917 | @@: |
||
2918 | mov word [edi-32+26], cx |
||
2919 | shr ecx, 16 |
||
2920 | mov [edi-32+20], cx |
||
2921 | jmp .writedircont |
||
2922 | |||
2923 | fat_read_symbol: |
||
2924 | or ax, -1 |
||
2925 | test esi, esi |
||
2926 | jz .retFFFF |
||
2927 | lodsb |
||
2928 | test al, al |
||
2929 | jnz ansi2uni_char |
||
2930 | xor eax, eax |
||
2931 | xor esi, esi |
||
2932 | .retFFFF: |
||
2933 | ret |
||
2934 | |||
2935 | fat_read_symbols: |
||
2936 | call fat_read_symbol |
||
2937 | stosw |
||
2938 | loop fat_read_symbols |
||
2939 | ret |
||
2940 | |||
2941 | |||
2942 | fat_Write.access_denied: |
||
2943 | push ERROR_ACCESS_DENIED |
||
2944 | fat_Write.ret0: |
||
2945 | pop eax |
||
2946 | xor ebx, ebx |
||
2947 | ret |
||
2948 | |||
2949 | fat_Write.ret11: |
||
2950 | push ERROR_DEVICE |
||
2951 | jmp fat_Write.ret0 |
||
2952 | |||
2953 | ;---------------------------------------------------------------- |
||
2954 | ; fat_Write - FAT implementation of writing to file |
||
2955 | ; in: ebp = pointer to FAT structure |
||
2956 | ; in: esi+[esp+4] = name |
||
2957 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
2958 | ; out: eax, ebx = return values for sysfunc 70 |
||
2959 | ;---------------------------------------------------------------- |
||
2960 | fat_Write: |
||
2961 | cmp byte [esi], 0 |
||
2962 | jz .access_denied |
||
2963 | call fat_lock |
||
2964 | push edi |
||
2965 | stdcall hd_find_lfn, [esp+4+4] |
||
2966 | jnc .found |
||
2967 | pop edi |
||
2968 | push eax |
||
2969 | call fat_unlock |
||
2970 | jmp .ret0 |
||
2971 | .found: |
||
2972 | ; FAT does not support files larger than 4GB |
||
2973 | cmp dword [ebx+8], 0 |
||
2974 | jz @f |
||
2975 | .eof: |
||
2976 | pop edi |
||
2977 | push ERROR_END_OF_FILE |
||
2978 | call fat_unlock |
||
2979 | jmp .ret0 |
||
2980 | @@: |
||
2981 | mov ecx, [ebx+12] |
||
2982 | mov edx, [ebx+16] |
||
2983 | mov ebx, [ebx+4] |
||
2984 | ; now edi points to direntry, ebx=start byte to write, |
||
2985 | ; ecx=number of bytes to write, edx=data pointer |
||
2986 | |||
2987 | ; extend file if needed |
||
2988 | add ecx, ebx |
||
2989 | jc .eof ; FAT does not support files larger than 4GB |
||
2990 | push edx |
||
2991 | push eax ; save directory sector |
||
2992 | push 0 ; return value=0 |
||
2993 | |||
2994 | call get_time_for_file |
||
2995 | mov [edi+22], ax ; last write time |
||
2996 | call get_date_for_file |
||
2997 | mov [edi+24], ax ; last write date |
||
2998 | mov [edi+18], ax ; last access date |
||
2999 | |||
3000 | push dword [edi+28] ; save current file size |
||
3001 | cmp ecx, [edi+28] |
||
3002 | jbe .length_ok |
||
3003 | cmp ecx, ebx |
||
3004 | jz .length_ok |
||
3005 | call hd_extend_file |
||
3006 | jnc .length_ok |
||
3007 | mov [esp+4], eax |
||
3008 | ; hd_extend_file can return three error codes: FAT table error, device error or disk full. |
||
3009 | ; First two cases are fatal errors, in third case we may write some data |
||
3010 | cmp al, ERROR_DISK_FULL |
||
3011 | jz .disk_full |
||
3012 | call fat_unlock |
||
3013 | pop eax |
||
3014 | pop eax |
||
3015 | pop ecx |
||
3016 | pop edx |
||
3017 | pop edi |
||
3018 | xor ebx, ebx |
||
3019 | ret |
||
3020 | .disk_full: |
||
3021 | ; correct number of bytes to write |
||
3022 | mov ecx, [edi+28] |
||
3023 | cmp ecx, ebx |
||
3024 | ja .length_ok |
||
3025 | push 0 |
||
3026 | .ret: |
||
3027 | pop eax |
||
3028 | sub edx, [esp+12] |
||
3029 | mov ebx, edx ; ebx=number of written bytes |
||
3030 | call update_disk |
||
3031 | test eax, eax |
||
3032 | jz @f |
||
3033 | mov byte [esp+4], ERROR_DEVICE |
||
3034 | @@: |
||
3035 | call fat_unlock |
||
3036 | pop eax |
||
3037 | pop eax |
||
3038 | pop ecx |
||
3039 | pop edx |
||
3040 | pop edi |
||
3041 | ret |
||
3042 | .length_ok: |
||
3043 | mov esi, [edi+28] |
||
3044 | mov eax, [edi+20-2] |
||
3045 | mov ax, [edi+26] |
||
3046 | mov edi, eax ; edi=current cluster |
||
3047 | push 0 ; current sector in cluster |
||
3048 | ; save directory |
||
3049 | mov eax, [esp+12] |
||
3050 | push ebx |
||
3051 | lea ebx, [ebp+FAT.buffer] |
||
3052 | call fs_write32_sys |
||
3053 | pop ebx |
||
3054 | test eax, eax |
||
3055 | jz @f |
||
3056 | .device_err: |
||
3057 | mov byte [esp+8], ERROR_DEVICE |
||
3058 | jmp .ret |
||
3059 | .fat_err: |
||
3060 | mov byte [esp+8], ERROR_FAT_TABLE |
||
3061 | jmp .ret |
||
3062 | @@: |
||
3063 | |||
3064 | ; now ebx=start pos, ecx=end pos, both lie inside file |
||
3065 | sub ecx, ebx |
||
3066 | jz .ret |
||
3067 | .write_loop: |
||
3068 | ; skip unmodified sectors |
||
3069 | cmp dword [esp+4], 0x200 |
||
3070 | jb .modify |
||
3071 | sub ebx, 0x200 |
||
3072 | jae .skip |
||
3073 | add ebx, 0x200 |
||
3074 | .modify: |
||
3075 | ; get length of data in current sector |
||
3076 | push ecx |
||
3077 | sub ebx, 0x200 |
||
3078 | jb .hasdata |
||
3079 | neg ebx |
||
3080 | xor ecx, ecx |
||
3081 | jmp @f |
||
3082 | .hasdata: |
||
3083 | neg ebx |
||
3084 | cmp ecx, ebx |
||
3085 | jbe @f |
||
3086 | mov ecx, ebx |
||
3087 | @@: |
||
3088 | ; get current sector number |
||
3089 | mov eax, edi |
||
3090 | dec eax |
||
3091 | dec eax |
||
3092 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3093 | add eax, [ebp+FAT.DATA_START] |
||
3094 | add eax, [esp+4] |
||
3095 | ; load sector if needed |
||
3096 | cmp dword [esp+8], 0 ; we don't need to read uninitialized data |
||
3097 | jz .noread |
||
3098 | cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten |
||
3099 | jz .noread |
||
3100 | cmp ecx, esi ; (same for the last sector) |
||
3101 | jz .noread |
||
3102 | push eax ebx |
||
3103 | lea ebx, [ebp+FAT.buffer] |
||
3104 | call fs_read32_app |
||
3105 | test eax, eax |
||
3106 | pop ebx eax |
||
3107 | jz @f |
||
3108 | .device_err2: |
||
3109 | pop ecx |
||
3110 | jmp .device_err |
||
3111 | @@: |
||
3112 | .noread: |
||
3113 | ; zero uninitialized data if file was extended (because hd_extend_file does not this) |
||
3114 | push eax ecx edi |
||
3115 | xor eax, eax |
||
3116 | mov ecx, 0x200 |
||
3117 | sub ecx, [esp+8+12] |
||
3118 | jbe @f |
||
3119 | lea edi, [ebp+FAT.buffer] |
||
3120 | add edi, [esp+8+12] |
||
3121 | rep stosb |
||
3122 | @@: |
||
3123 | ; zero uninitialized data in the last sector |
||
3124 | mov ecx, 0x200 |
||
3125 | sub ecx, esi |
||
3126 | jbe @f |
||
3127 | lea edi, [ebp+FAT.buffer+esi] |
||
3128 | rep stosb |
||
3129 | @@: |
||
3130 | pop edi ecx |
||
3131 | ; copy new data |
||
3132 | mov eax, edx |
||
3133 | neg ebx |
||
3134 | jecxz @f |
||
3135 | lea ebx, [ebp+FAT.buffer+0x200+ebx] |
||
3136 | call memmove |
||
3137 | xor ebx, ebx |
||
3138 | @@: |
||
3139 | pop eax |
||
3140 | ; save sector |
||
3141 | push ebx |
||
3142 | lea ebx, [ebp+FAT.buffer] |
||
3143 | call fs_write32_app |
||
3144 | pop ebx |
||
3145 | test eax, eax |
||
3146 | jnz .device_err2 |
||
3147 | add edx, ecx |
||
3148 | sub [esp], ecx |
||
3149 | pop ecx |
||
3150 | jz .ret |
||
3151 | .skip: |
||
3152 | ; next sector |
||
3153 | pop eax |
||
3154 | inc eax |
||
3155 | push eax |
||
3156 | cmp eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3157 | jb @f |
||
3158 | and dword [esp], 0 |
||
3159 | mov eax, edi |
||
3160 | call get_FAT |
||
3161 | mov edi, eax |
||
3162 | jc .device_err |
||
3163 | cmp edi, 2 |
||
3164 | jb .fat_err |
||
3165 | cmp edi, [ebp+FAT.fatRESERVED] |
||
3166 | jae .fat_err |
||
3167 | @@: |
||
3168 | sub esi, 0x200 |
||
3169 | jae @f |
||
3170 | xor esi, esi |
||
3171 | @@: |
||
3172 | sub dword [esp+4], 0x200 |
||
3173 | jae @f |
||
3174 | and dword [esp+4], 0 |
||
3175 | @@: |
||
3176 | jmp .write_loop |
||
3177 | |||
3178 | hd_extend_file.zero_size: |
||
3179 | xor eax, eax |
||
3180 | jmp hd_extend_file.start_extend |
||
3181 | |||
3182 | ; extends file on hd to given size (new data area is undefined) |
||
3183 | ; in: edi->direntry, ecx=new size |
||
3184 | ; out: CF=0 => OK, eax=0 |
||
3185 | ; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL or ERROR_DEVICE) |
||
3186 | hd_extend_file: |
||
3187 | push esi |
||
3188 | mov esi, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3189 | imul esi, [ebp+FAT.BYTES_PER_SECTOR] |
||
3190 | push ecx |
||
3191 | ; find the last cluster of file |
||
3192 | mov eax, [edi+20-2] |
||
3193 | mov ax, [edi+26] |
||
3194 | mov ecx, [edi+28] |
||
3195 | jecxz .zero_size |
||
3196 | .last_loop: |
||
3197 | sub ecx, esi |
||
3198 | jbe .last_found |
||
3199 | call get_FAT |
||
3200 | jnc @f |
||
3201 | .device_err: |
||
3202 | pop ecx |
||
3203 | .device_err2: |
||
3204 | pop esi |
||
3205 | push ERROR_DEVICE |
||
3206 | .ret_err: |
||
3207 | pop eax |
||
3208 | stc |
||
3209 | ret |
||
3210 | @@: |
||
3211 | cmp eax, 2 |
||
3212 | jb .fat_err |
||
3213 | cmp eax, [ebp+FAT.fatRESERVED] |
||
3214 | jb .last_loop |
||
3215 | .fat_err: |
||
3216 | pop ecx esi |
||
3217 | push ERROR_FAT_TABLE |
||
3218 | jmp .ret_err |
||
3219 | .last_found: |
||
3220 | push eax |
||
3221 | call get_FAT |
||
3222 | jnc @f |
||
3223 | pop eax |
||
3224 | jmp .device_err |
||
3225 | @@: |
||
3226 | cmp eax, [ebp+FAT.fatRESERVED] |
||
3227 | pop eax |
||
3228 | jb .fat_err |
||
3229 | ; set length to full number of clusters |
||
3230 | sub [edi+28], ecx |
||
3231 | .start_extend: |
||
3232 | pop ecx |
||
3233 | ; now do extend |
||
3234 | push edx |
||
3235 | mov edx, 2 ; start scan from cluster 2 |
||
3236 | .extend_loop: |
||
3237 | cmp [edi+28], ecx |
||
3238 | jae .extend_done |
||
3239 | ; add new cluster |
||
3240 | push eax |
||
3241 | call get_free_FAT |
||
3242 | jc .disk_full |
||
3243 | mov edx, [ebp+FAT.fatEND] |
||
3244 | call set_FAT |
||
3245 | mov edx, eax |
||
3246 | pop eax |
||
3247 | test eax, eax |
||
3248 | jz .first_cluster |
||
3249 | push edx |
||
3250 | call set_FAT |
||
3251 | pop edx |
||
3252 | jmp @f |
||
3253 | .first_cluster: |
||
3254 | ror edx, 16 |
||
3255 | mov [edi+20], dx |
||
3256 | ror edx, 16 |
||
3257 | mov [edi+26], dx |
||
3258 | @@: |
||
3259 | push ecx |
||
3260 | mov ecx, -1 |
||
3261 | call add_disk_free_space |
||
3262 | pop ecx |
||
3263 | mov eax, edx |
||
3264 | add [edi+28], esi |
||
3265 | jmp .extend_loop |
||
3266 | .extend_done: |
||
3267 | mov [edi+28], ecx |
||
3268 | pop edx esi |
||
3269 | xor eax, eax ; CF=0 |
||
3270 | ret |
||
3271 | .device_err3: |
||
3272 | pop edx |
||
3273 | jmp .device_err2 |
||
3274 | .disk_full: |
||
3275 | pop eax edx esi |
||
3276 | movi eax, ERROR_DISK_FULL |
||
3277 | stc |
||
3278 | ret |
||
3279 | |||
3280 | fat_update_datetime: |
||
3281 | call get_time_for_file |
||
3282 | mov [edi+22], ax ; last write time |
||
3283 | call get_date_for_file |
||
3284 | mov [edi+24], ax ; last write date |
||
3285 | mov [edi+18], ax ; last access date |
||
3286 | ret |
||
3287 | |||
3288 | |||
3289 | ;---------------------------------------------------------------- |
||
3290 | ; fat_SetFileEnd - FAT implementation of setting end-of-file |
||
3291 | ; in: ebp = pointer to FAT structure |
||
3292 | ; in: esi+[esp+4] = name |
||
3293 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
3294 | ; out: eax, ebx = return values for sysfunc 70 |
||
3295 | ;---------------------------------------------------------------- |
||
3296 | fat_SetFileEnd: |
||
3297 | call fat_lock |
||
3298 | push edi |
||
3299 | cmp byte [esi], 0 |
||
3300 | jnz @f |
||
3301 | .access_denied: |
||
3302 | push ERROR_ACCESS_DENIED |
||
3303 | .ret: |
||
3304 | call fat_unlock |
||
3305 | pop eax |
||
3306 | pop edi |
||
3307 | ret |
||
3308 | @@: |
||
3309 | stdcall hd_find_lfn, [esp+4+4] |
||
3310 | jnc @f |
||
3311 | .reteax: |
||
3312 | push eax |
||
3313 | jmp .ret |
||
3314 | @@: |
||
3315 | ; must not be directory |
||
3316 | test byte [edi+11], 10h |
||
3317 | jnz .access_denied |
||
3318 | ; file size must not exceed 4 Gb |
||
3319 | cmp dword [ebx+8], 0 |
||
3320 | jz @f |
||
3321 | push ERROR_END_OF_FILE |
||
3322 | jmp .ret |
||
3323 | @@: |
||
3324 | push eax ; save directory sector |
||
3325 | ; set file modification date/time to current |
||
3326 | call fat_update_datetime |
||
3327 | mov eax, [ebx+4] |
||
3328 | cmp eax, [edi+28] |
||
3329 | jb .truncate |
||
3330 | ja .expand |
||
3331 | pop eax |
||
3332 | lea ebx, [ebp+FAT.buffer] |
||
3333 | call fs_write32_sys |
||
3334 | test eax, eax |
||
3335 | jz @f |
||
3336 | push ERROR_DEVICE |
||
3337 | jmp .ret |
||
3338 | @@: |
||
3339 | push 0 |
||
3340 | jmp .ret |
||
3341 | .expand: |
||
3342 | push ebx ebp ecx |
||
3343 | push dword [edi+28] ; save old size |
||
3344 | mov ecx, eax |
||
3345 | call hd_extend_file |
||
3346 | push eax ; return code |
||
3347 | jnc .expand_ok |
||
3348 | cmp al, ERROR_DISK_FULL |
||
3349 | jz .disk_full |
||
3350 | .pop_ret: |
||
3351 | call update_disk |
||
3352 | pop eax ecx ecx ebp ebx ecx |
||
3353 | jmp .reteax |
||
3354 | .expand_ok: |
||
3355 | .disk_full: |
||
3356 | ; save directory |
||
3357 | mov eax, [edi+28] |
||
3358 | xchg eax, [esp+20] |
||
3359 | lea ebx, [ebp+FAT.buffer] |
||
3360 | call fs_write32_sys |
||
3361 | test eax, eax |
||
3362 | mov eax, [edi+20-2] |
||
3363 | mov ax, [edi+26] |
||
3364 | mov edi, eax |
||
3365 | jz @f |
||
3366 | .pop_ret11: |
||
3367 | mov byte [esp], ERROR_DEVICE |
||
3368 | jmp .pop_ret |
||
3369 | @@: |
||
3370 | test edi, edi |
||
3371 | jz .pop_ret |
||
3372 | ; now zero new data |
||
3373 | push 0 |
||
3374 | ; edi=current cluster, [esp]=sector in cluster |
||
3375 | ; [esp+24]=new size, [esp+8]=old size, [esp+4]=return code |
||
3376 | .zero_loop: |
||
3377 | cmp edi, 2 |
||
3378 | jb .error_fat |
||
3379 | cmp edi, [ebp+FAT.fatRESERVED] |
||
3380 | jae .error_fat |
||
3381 | sub dword [esp+8], 0x200 |
||
3382 | jae .next_cluster |
||
3383 | lea eax, [edi-2] |
||
3384 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3385 | add eax, [ebp+FAT.DATA_START] |
||
3386 | add eax, [esp] |
||
3387 | cmp dword [esp+8], -0x200 |
||
3388 | jz .noread |
||
3389 | push eax |
||
3390 | lea ebx, [ebp+FAT.buffer] |
||
3391 | call fs_read32_app |
||
3392 | test eax, eax |
||
3393 | pop eax |
||
3394 | jnz .err_next |
||
3395 | .noread: |
||
3396 | mov ecx, [esp+8] |
||
3397 | neg ecx |
||
3398 | push edi |
||
3399 | lea edi, [ebp+FAT.buffer+0x200] |
||
3400 | add edi, [esp+12] |
||
3401 | push eax |
||
3402 | xor eax, eax |
||
3403 | mov [esp+16], eax |
||
3404 | rep stosb |
||
3405 | pop eax |
||
3406 | pop edi |
||
3407 | call fs_write32_app |
||
3408 | test eax, eax |
||
3409 | jz .next_cluster |
||
3410 | .err_next: |
||
3411 | mov byte [esp+4], ERROR_DEVICE |
||
3412 | .next_cluster: |
||
3413 | pop eax |
||
3414 | sub dword [esp+20], 0x200 |
||
3415 | jbe .pop_ret |
||
3416 | inc eax |
||
3417 | push eax |
||
3418 | cmp eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3419 | jb .zero_loop |
||
3420 | and dword [esp], 0 |
||
3421 | mov eax, edi |
||
3422 | call get_FAT |
||
3423 | mov edi, eax |
||
3424 | jnc .zero_loop |
||
3425 | pop eax |
||
3426 | jmp .pop_ret11 |
||
3427 | .truncate: |
||
3428 | mov [edi+28], eax |
||
3429 | push ecx |
||
3430 | mov ecx, [edi+20-2] |
||
3431 | mov cx, [edi+26] |
||
3432 | push eax |
||
3433 | test eax, eax |
||
3434 | jz .zero_size |
||
3435 | ; find new last cluster |
||
3436 | @@: |
||
3437 | cmp ecx, 2 |
||
3438 | jb .error_fat2 |
||
3439 | cmp ecx, [ebp+FAT.fatRESERVED] |
||
3440 | jae .error_fat2 |
||
3441 | mov eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3442 | shl eax, 9 |
||
3443 | sub [esp], eax |
||
3444 | jbe @f |
||
3445 | mov eax, ecx |
||
3446 | call get_FAT |
||
3447 | mov ecx, eax |
||
3448 | jnc @b |
||
3449 | .device_err3: |
||
3450 | pop eax ecx eax edi |
||
3451 | call update_disk |
||
3452 | call fat_unlock |
||
3453 | movi eax, ERROR_DEVICE |
||
3454 | ret |
||
3455 | @@: |
||
3456 | ; we will zero data at the end of last sector - remember it |
||
3457 | push ecx |
||
3458 | ; terminate FAT chain |
||
3459 | push edx |
||
3460 | mov eax, ecx |
||
3461 | mov edx, [ebp+FAT.fatEND] |
||
3462 | call set_FAT |
||
3463 | mov eax, edx |
||
3464 | pop edx |
||
3465 | jnc @f |
||
3466 | .device_err4: |
||
3467 | pop ecx |
||
3468 | jmp .device_err3 |
||
3469 | .zero_size: |
||
3470 | and word [edi+20], 0 |
||
3471 | and word [edi+26], 0 |
||
3472 | push 0 |
||
3473 | mov eax, ecx |
||
3474 | @@: |
||
3475 | ; delete FAT chain |
||
3476 | call clear_cluster_chain |
||
3477 | jc .device_err4 |
||
3478 | ; save directory |
||
3479 | mov eax, [esp+12] |
||
3480 | push ebx |
||
3481 | lea ebx, [ebp+FAT.buffer] |
||
3482 | call fs_write32_sys |
||
3483 | pop ebx |
||
3484 | test eax, eax |
||
3485 | jnz .device_err4 |
||
3486 | ; zero last sector, ignore errors |
||
3487 | pop ecx |
||
3488 | pop eax |
||
3489 | dec ecx |
||
3490 | imul ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3491 | add ecx, [ebp+FAT.DATA_START] |
||
3492 | push eax |
||
3493 | sar eax, 9 |
||
3494 | add ecx, eax |
||
3495 | pop eax |
||
3496 | and eax, 0x1FF |
||
3497 | jz .truncate_done |
||
3498 | push ebx eax |
||
3499 | mov eax, ecx |
||
3500 | lea ebx, [ebp+FAT.buffer] |
||
3501 | call fs_read32_app |
||
3502 | pop eax |
||
3503 | lea edi, [ebp+FAT.buffer+eax] |
||
3504 | push ecx |
||
3505 | mov ecx, 0x200 |
||
3506 | sub ecx, eax |
||
3507 | xor eax, eax |
||
3508 | rep stosb |
||
3509 | pop eax |
||
3510 | call fs_write32_app |
||
3511 | pop ebx |
||
3512 | .truncate_done: |
||
3513 | pop ecx eax edi |
||
3514 | call update_disk |
||
3515 | call fat_unlock |
||
3516 | xor eax, eax |
||
3517 | ret |
||
3518 | .error_fat: |
||
3519 | pop eax |
||
3520 | mov byte [esp], ERROR_FAT_TABLE |
||
3521 | jmp .pop_ret |
||
3522 | .error_fat2: |
||
3523 | pop eax ecx eax edi |
||
3524 | call update_disk |
||
3525 | call fat_unlock |
||
3526 | movi eax, ERROR_FAT_TABLE |
||
3527 | ret |
||
3528 | |||
3529 | ;---------------------------------------------------------------- |
||
3530 | ; fat_GetFileInfo - FAT implementation of getting file info |
||
3531 | ; in: ebp = pointer to FAT structure |
||
3532 | ; in: esi+[esp+4] = name |
||
3533 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
3534 | ; out: eax, ebx = return values for sysfunc 70 |
||
3535 | ;---------------------------------------------------------------- |
||
3536 | fat_GetFileInfo: |
||
3537 | cmp byte [esi], 0 |
||
3538 | jnz @f |
||
3539 | mov eax, 2 |
||
3540 | ret |
||
3541 | @@: |
||
3542 | push edi |
||
3543 | call fat_lock |
||
3544 | stdcall hd_find_lfn, [esp+4+4] |
||
3545 | jc .error |
||
3546 | push ebp |
||
3547 | xor ebp, ebp |
||
3548 | mov esi, [ebx+16] |
||
3549 | mov dword [esi+4], ebp |
||
3550 | call fat_entry_to_bdfe2 |
||
3551 | pop ebp |
||
3552 | call fat_unlock |
||
3553 | xor eax, eax |
||
3554 | pop edi |
||
3555 | ret |
||
3556 | .error: |
||
3557 | push eax |
||
3558 | call fat_unlock |
||
3559 | pop eax |
||
3560 | pop edi |
||
3561 | ret |
||
3562 | |||
3563 | ;---------------------------------------------------------------- |
||
3564 | ; fat_SetFileInfo - FAT implementation of setting file info |
||
3565 | ; in: ebp = pointer to FAT structure |
||
3566 | ; in: esi+[esp+4] = name |
||
3567 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
3568 | ; out: eax, ebx = return values for sysfunc 70 |
||
3569 | ;---------------------------------------------------------------- |
||
3570 | fat_SetFileInfo: |
||
3571 | cmp byte [esi], 0 |
||
3572 | jnz @f |
||
3573 | mov eax, 2 |
||
3574 | ret |
||
3575 | @@: |
||
3576 | push edi |
||
3577 | call fat_lock |
||
3578 | stdcall hd_find_lfn, [esp+4+4] |
||
3579 | jc .error |
||
3580 | push eax |
||
3581 | mov edx, [ebx+16] |
||
3582 | call bdfe_to_fat_entry |
||
3583 | pop eax |
||
3584 | lea ebx, [ebp+FAT.buffer] |
||
3585 | call fs_write32_sys |
||
3586 | call update_disk |
||
3587 | call fat_unlock |
||
3588 | pop edi |
||
3589 | xor eax, eax |
||
3590 | ret |
||
3591 | .error: |
||
3592 | push eax |
||
3593 | call fat_unlock |
||
3594 | pop eax |
||
3595 | pop edi |
||
3596 | ret |
||
3597 | |||
3598 | ;---------------------------------------------------------------- |
||
3599 | ; fat_Delete - FAT implementation of deleting a file/folder |
||
3600 | ; in: ebp = pointer to FAT structure |
||
3601 | ; in: esi+[esp+4] = name |
||
3602 | ; in: ebx = pointer to parameters from sysfunc 70 |
||
3603 | ; out: eax, ebx = return values for sysfunc 70 |
||
3604 | ;---------------------------------------------------------------- |
||
3605 | fat_Delete: |
||
3606 | call fat_lock |
||
3607 | cmp byte [esi], 0 |
||
3608 | jnz @f |
||
3609 | ; cannot delete root! |
||
3610 | .access_denied: |
||
3611 | push ERROR_ACCESS_DENIED |
||
3612 | .pop_ret: |
||
3613 | call fat_unlock |
||
3614 | pop eax |
||
3615 | xor ebx, ebx |
||
3616 | ret |
||
3617 | @@: |
||
3618 | and [ebp+FAT.longname_sec1], 0 |
||
3619 | and [ebp+FAT.longname_sec2], 0 |
||
3620 | push edi |
||
3621 | stdcall hd_find_lfn, [esp+4+4] |
||
3622 | jnc .found |
||
3623 | pop edi |
||
3624 | push ERROR_FILE_NOT_FOUND |
||
3625 | jmp .pop_ret |
||
3626 | .found: |
||
3627 | cmp dword [edi], '. ' |
||
3628 | jz .access_denied2 |
||
3629 | cmp dword [edi], '.. ' |
||
3630 | jz .access_denied2 |
||
3631 | test byte [edi+11], 10h |
||
3632 | jz .dodel |
||
3633 | ; we can delete only empty folders! |
||
3634 | pushad |
||
3635 | mov esi, [edi+20-2] |
||
3636 | mov si, [edi+26] |
||
3637 | xor ecx, ecx |
||
3638 | lea eax, [esi-2] |
||
3639 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3640 | add eax, [ebp+FAT.DATA_START] |
||
3641 | lea ebx, [ebp+FAT.buffer] |
||
3642 | call fs_read32_sys |
||
3643 | test eax, eax |
||
3644 | jnz .err1 |
||
3645 | lea eax, [ebx+0x200] |
||
3646 | add ebx, 2*0x20 |
||
3647 | .checkempty: |
||
3648 | cmp byte [ebx], 0 |
||
3649 | jz .empty |
||
3650 | cmp byte [ebx], 0xE5 |
||
3651 | jnz .notempty |
||
3652 | add ebx, 0x20 |
||
3653 | cmp ebx, eax |
||
3654 | jb .checkempty |
||
3655 | inc ecx |
||
3656 | cmp ecx, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3657 | jb @f |
||
3658 | mov eax, esi |
||
3659 | call get_FAT |
||
3660 | jc .err1 |
||
3661 | cmp eax, 2 |
||
3662 | jb .error_fat |
||
3663 | cmp eax, [ebp+FAT.fatRESERVED] |
||
3664 | jae .empty |
||
3665 | mov esi, eax |
||
3666 | xor ecx, ecx |
||
3667 | @@: |
||
3668 | lea eax, [esi-2] |
||
3669 | imul eax, [ebp+FAT.SECTORS_PER_CLUSTER] |
||
3670 | add eax, [ebp+FAT.DATA_START] |
||
3671 | add eax, ecx |
||
3672 | lea ebx, [ebp+FAT.buffer] |
||
3673 | call fs_read32_sys |
||
3674 | test eax, eax |
||
3675 | lea eax, [ebx+0x200] |
||
3676 | jz .checkempty |
||
3677 | .err1: |
||
3678 | popad |
||
3679 | .err2: |
||
3680 | pop edi |
||
3681 | call fat_unlock |
||
3682 | movi eax, ERROR_DEVICE |
||
3683 | ret |
||
3684 | .error_fat: |
||
3685 | popad |
||
3686 | pop edi |
||
3687 | call fat_unlock |
||
3688 | movi eax, ERROR_FAT_TABLE |
||
3689 | ret |
||
3690 | .notempty: |
||
3691 | popad |
||
3692 | .access_denied2: |
||
3693 | pop edi |
||
3694 | call fat_unlock |
||
3695 | movi eax, ERROR_ACCESS_DENIED |
||
3696 | ret |
||
3697 | .empty: |
||
3698 | popad |
||
3699 | push eax ebx |
||
3700 | lea ebx, [ebp+FAT.buffer] |
||
3701 | call fs_read32_sys |
||
3702 | test eax, eax |
||
3703 | pop ebx eax |
||
3704 | jnz .err2 |
||
3705 | .dodel: |
||
3706 | push eax |
||
3707 | mov eax, [edi+20-2] |
||
3708 | mov ax, [edi+26] |
||
3709 | xchg eax, [esp] |
||
3710 | ; delete folder entry |
||
3711 | mov byte [edi], 0xE5 |
||
3712 | ; delete LFN (if present) |
||
3713 | .lfndel: |
||
3714 | lea edx, [ebp+FAT.buffer] |
||
3715 | cmp edi, edx |
||
3716 | ja @f |
||
3717 | cmp [ebp+FAT.longname_sec2], 0 |
||
3718 | jz .lfndone |
||
3719 | push [ebp+FAT.longname_sec2] |
||
3720 | push [ebp+FAT.longname_sec1] |
||
3721 | pop [ebp+FAT.longname_sec2] |
||
3722 | and [ebp+FAT.longname_sec1], 0 |
||
3723 | push ebx |
||
3724 | mov ebx, edx |
||
3725 | call fs_write32_sys |
||
3726 | mov eax, [esp+4] |
||
3727 | call fs_read32_sys |
||
3728 | pop ebx |
||
3729 | pop eax |
||
3730 | lea edi, [ebp+FAT.buffer+0x200] |
||
3731 | @@: |
||
3732 | sub edi, 0x20 |
||
3733 | cmp byte [edi], 0xE5 |
||
3734 | jz .lfndone |
||
3735 | cmp byte [edi+11], 0xF |
||
3736 | jnz .lfndone |
||
3737 | mov byte [edi], 0xE5 |
||
3738 | jmp .lfndel |
||
3739 | .lfndone: |
||
3740 | push ebx |
||
3741 | lea ebx, [ebp+FAT.buffer] |
||
3742 | call fs_write32_sys |
||
3743 | pop ebx |
||
3744 | ; delete FAT chain |
||
3745 | pop eax |
||
3746 | call clear_cluster_chain |
||
3747 | call update_disk |
||
3748 | call fat_unlock |
||
3749 | pop edi |
||
3750 | xor eax, eax |
||
3751 | ret |
||
3752 | |||
3753 | ; \end{diamond}=>=>=>=>=>=>>65536 |