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Rev | Author | Line No. | Line |
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425 | victor | 1 | $Revision: 437 $ |
431 | serge | 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
3 | ;; ;; |
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4 | ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; |
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5 | ;; Distributed under terms of the GNU General Public License ;; |
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6 | ;; ;; |
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7 | ;; RAMDISK functions ;; |
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8 | ;; (C) 2004 Ville Turjanmaa, License: GPL ;; |
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9 | ;; Addings by M.Lisovin ;; |
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10 | ;; LFN support by diamond ;; |
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11 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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1 | ha | 12 | |
5 | halyavin | 13 | ; calculate fat chain |
1 | ha | 14 | |
5 | halyavin | 15 | calculatefatchain: |
16 | |||
17 | pushad |
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18 | |||
381 | serge | 19 | mov esi,RAMDISK+512 |
20 | mov edi,RAMDISK_FAT |
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5 | halyavin | 21 | |
22 | fcnew: |
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23 | mov eax,dword [esi] |
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24 | mov ebx,dword [esi+4] |
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25 | mov ecx,dword [esi+8] |
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26 | mov edx,ecx |
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27 | shr edx,4 ;8 ok |
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28 | shr dx,4 ;7 ok |
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29 | xor ch,ch |
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30 | shld ecx,ebx,20 ;6 ok |
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31 | shr cx,4 ;5 ok |
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32 | shld ebx,eax,12 |
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33 | and ebx,0x0fffffff ;4 ok |
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34 | shr bx,4 ;3 ok |
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35 | shl eax,4 |
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36 | and eax,0x0fffffff ;2 ok |
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37 | shr ax,4 ;1 ok |
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78 | diamond | 38 | mov dword [edi],eax |
39 | mov dword [edi+4],ebx |
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40 | mov dword [edi+8],ecx |
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41 | mov dword [edi+12],edx |
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42 | add edi,16 |
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5 | halyavin | 43 | add esi,12 |
44 | |||
381 | serge | 45 | cmp edi,RAMDISK_FAT+2856*2 ;2849 clusters |
5 | halyavin | 46 | jnz fcnew |
47 | |||
48 | popad |
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49 | ret |
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50 | |||
51 | |||
52 | restorefatchain: ; restore fat chain |
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53 | |||
54 | pushad |
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55 | |||
381 | serge | 56 | mov esi,RAMDISK_FAT |
57 | mov edi,RAMDISK+512 |
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5 | halyavin | 58 | |
59 | fcnew2: |
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60 | mov eax,dword [esi] |
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61 | mov ebx,dword [esi+4] |
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62 | shl ax,4 |
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63 | shl eax,4 |
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64 | shl bx,4 |
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65 | shr ebx,4 |
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66 | shrd eax,ebx,8 |
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67 | shr ebx,8 |
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78 | diamond | 68 | mov dword [edi],eax |
69 | mov word [edi+4],bx |
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70 | add edi,6 |
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5 | halyavin | 71 | add esi,8 |
72 | |||
381 | serge | 73 | cmp edi,RAMDISK+512+4278 ;4274 bytes - all used FAT |
5 | halyavin | 74 | jb fcnew2 |
75 | |||
381 | serge | 76 | mov esi,RAMDISK+512 ; duplicate fat chain |
77 | mov edi,RAMDISK+512+0x1200 |
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5 | halyavin | 78 | mov ecx,1069 ;4274/4 |
79 | cld |
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80 | rep movsd |
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81 | |||
82 | popad |
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83 | ret |
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84 | |||
85 | |||
1 | ha | 86 | ramdisk_free_space: |
87 | ;--------------------------------------------- |
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88 | ; |
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89 | ; returns free space in edi |
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90 | ; rewr.by Mihasik |
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91 | ;--------------------------------------------- |
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92 | |||
93 | push eax ebx ecx |
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94 | |||
381 | serge | 95 | mov edi,RAMDISK_FAT ;start of FAT |
1 | ha | 96 | xor ax,ax ;Free cluster=0x0000 in FAT |
97 | xor ebx,ebx ;counter |
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5 | halyavin | 98 | mov ecx,2849 ;2849 clusters |
1 | ha | 99 | cld |
100 | rdfs1: |
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101 | repne scasw |
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102 | jnz rdfs2 ;if last cluster not 0 |
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103 | inc ebx |
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78 | diamond | 104 | test ecx, ecx |
105 | jnz rdfs1 |
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1 | ha | 106 | rdfs2: |
107 | shl ebx,9 ;free clusters*512 |
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108 | mov edi,ebx |
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247 | serge | 109 | |
1 | ha | 110 | pop ecx ebx eax |
111 | ret |
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112 | |||
113 | |||
114 | expand_filename: |
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115 | ;--------------------------------------------- |
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116 | ; |
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117 | ; exapand filename with '.' to 11 character |
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118 | ; eax - pointer to filename |
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119 | ;--------------------------------------------- |
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120 | |||
121 | push esi edi ebx |
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122 | |||
123 | mov edi,esp ; check for '.' in the name |
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124 | add edi,12+8 |
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125 | |||
126 | mov esi,eax |
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127 | |||
128 | mov eax,edi |
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129 | mov [eax+0],dword ' ' |
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130 | mov [eax+4],dword ' ' |
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131 | mov [eax+8],dword ' ' |
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132 | |||
133 | flr1: |
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134 | |||
135 | cmp [esi],byte '.' |
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136 | jne flr2 |
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137 | mov edi,eax |
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138 | add edi,7 |
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139 | jmp flr3 |
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140 | |||
141 | flr2: |
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142 | |||
143 | mov bl,[esi] |
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144 | mov [edi],bl |
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145 | |||
146 | flr3: |
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147 | |||
148 | inc esi |
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149 | inc edi |
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150 | |||
151 | mov ebx,eax |
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152 | add ebx,11 |
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153 | |||
154 | cmp edi,ebx |
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155 | jbe flr1 |
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156 | |||
157 | pop ebx edi esi |
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158 | ret |
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159 | |||
160 | fileread: |
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161 | ;---------------------------------------------------------------- |
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162 | ; |
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163 | ; fileread - sys floppy |
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164 | ; |
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165 | ; eax points to filename 11 chars |
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166 | ; ebx first wanted block ; 1+ ; if 0 then set to 1 |
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167 | ; ecx number of blocks to read ; 1+ ; if 0 then set to 1 |
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168 | ; edx mem location to return data |
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169 | ; esi length of filename 12*X 0=root |
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170 | ; |
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171 | ; ret ebx = size or 0xffffffff file not found |
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172 | ; eax = 0 ok read or other = errormsg |
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173 | ; |
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174 | ;-------------------------------------------------------------- |
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175 | test ebx,ebx ;if ebx=0 - set to 1 |
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176 | jnz frfl5 |
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177 | inc ebx |
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178 | frfl5: |
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179 | test ecx,ecx ;if ecx=0 - set to 1 |
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180 | jnz frfl6 |
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181 | inc ecx |
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182 | frfl6: |
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183 | test esi,esi ; return ramdisk root |
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184 | jnz fr_noroot ;if not root |
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185 | cmp ebx,14 ;14 clusters=root dir |
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186 | ja oorr |
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187 | cmp ecx,14 |
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188 | ja oorr |
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189 | jmp fr_do |
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190 | oorr: |
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191 | mov eax,5 ;out of root range (fnf) |
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192 | xor ebx,ebx |
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193 | dec ebx ;0xffffffff |
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194 | ret |
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195 | |||
196 | fr_do: ;reading rootdir |
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197 | mov edi,edx |
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198 | dec ebx |
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199 | push edx |
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247 | serge | 200 | mov edx,ecx |
1 | ha | 201 | add edx,ebx |
5 | halyavin | 202 | cmp edx,15 ;ebx+ecx=14+1 |
1 | ha | 203 | pushf |
204 | jbe fr_do1 |
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205 | sub edx,14 |
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206 | sub ecx,edx |
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207 | fr_do1: |
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208 | shl ebx,9 |
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381 | serge | 209 | mov esi,RAMDISK+512*19 |
1 | ha | 210 | add esi,ebx |
211 | shl ecx,7 |
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212 | cld |
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213 | rep movsd |
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214 | popf |
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215 | pop edx |
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5 | halyavin | 216 | jae fr_do2 |
1 | ha | 217 | xor eax,eax ; ok read |
218 | xor ebx,ebx |
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219 | ret |
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220 | fr_do2: ;if last cluster |
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221 | mov eax,6 ;end of file |
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222 | xor ebx,ebx |
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223 | ret |
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224 | |||
225 | fr_noroot: |
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226 | |||
227 | sub esp,32 |
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228 | call expand_filename |
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229 | |||
230 | dec ebx |
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231 | |||
232 | push eax |
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233 | |||
234 | push eax ebx ecx edx esi edi |
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235 | call rd_findfile |
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236 | je fifound |
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237 | add esp,32+28 ;if file not found |
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238 | ret |
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239 | |||
240 | fifound: |
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241 | |||
242 | mov ebx,[edi-11+28] ;file size |
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243 | mov [esp+20],ebx |
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244 | mov [esp+24],ebx |
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245 | add edi,0xf |
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246 | movzx eax,word [edi] |
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247 | mov edi,eax ;edi=cluster |
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248 | |||
249 | frnew: |
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250 | |||
251 | add eax,31 ;bootsector+2*fat+filenames |
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252 | shl eax,9 ;*512 |
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381 | serge | 253 | add eax,RAMDISK ;image base |
1 | ha | 254 | mov ebx,[esp+8] |
255 | mov ecx,512 ;[esp+4] |
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256 | |||
257 | cmp [esp+16],dword 0 ; wanted cluster ? |
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258 | jne frfl7 |
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259 | call memmove |
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260 | add [esp+8],dword 512 |
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261 | dec dword [esp+12] ; last wanted cluster ? |
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262 | je frnoread |
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263 | jmp frfl8 |
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264 | frfl7: |
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265 | dec dword [esp+16] |
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266 | frfl8: |
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381 | serge | 267 | movzx eax,word [edi*2+RAMDISK_FAT] ; find next cluster from FAT |
1 | ha | 268 | mov edi,eax |
269 | cmp edi,4095 ;eof - cluster |
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270 | jz frnoread2 |
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271 | |||
272 | cmp [esp+24],dword 512 ;eof - size |
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273 | jb frnoread |
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274 | sub [esp+24],dword 512 |
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275 | |||
276 | jmp frnew |
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277 | |||
278 | frnoread2: |
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279 | |||
280 | cmp [esp+16],dword 0 ; eof without read ? |
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281 | je frnoread |
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282 | |||
283 | pop edi esi edx ecx |
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284 | add esp,4 |
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285 | pop ebx ; ebx <- eax : size of file |
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286 | add esp,36 |
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287 | mov eax,6 ; end of file |
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288 | ret |
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289 | |||
290 | frnoread: |
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291 | |||
292 | pop edi esi edx ecx |
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293 | add esp,4 |
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294 | pop ebx ; ebx <- eax : size of file |
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295 | add esp,36 |
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296 | xor eax,eax ;read ok |
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297 | ret |
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298 | |||
299 | filedelete: |
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300 | ;-------------------------------------------- |
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301 | ; |
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302 | ; filedelete - sys floppy |
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303 | ; in: |
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304 | ; eax - pointer to filename 11 chars |
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305 | ; |
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306 | ; out: |
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307 | ; eax - 0 = successful, 5 = file not found |
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308 | ; |
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309 | ;-------------------------------------------- |
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310 | |||
311 | sub esp,32 |
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312 | call expand_filename |
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313 | |||
314 | push eax ebx ecx edx esi edi |
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247 | serge | 315 | |
1 | ha | 316 | call rd_findfile |
317 | je fifoundd |
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318 | pop edi esi edx ecx ebx eax ;file not found |
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319 | add esp,32 |
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320 | mov eax,5 |
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321 | ret |
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322 | |||
323 | fifoundd: |
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324 | |||
325 | mov [edi-11],byte 0xE5 ;mark filename deleted |
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326 | add edi,0xf |
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327 | movzx eax,word [edi] |
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328 | mov edi,eax ;edi = cluster |
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329 | |||
330 | frnewd: |
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331 | |||
332 | shl edi,1 ;find next cluster from FAT |
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381 | serge | 333 | add edi,RAMDISK_FAT |
1 | ha | 334 | movzx eax,word [edi] |
335 | mov [edi],word 0x0 ;clear fat chain cluster |
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336 | mov edi,eax |
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337 | cmp edi,dword 0xff8 ;last cluster ? |
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338 | jb frnewd |
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339 | |||
340 | pop edi esi edx ecx ebx eax |
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341 | add esp,32 |
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342 | xor eax,eax ; file found |
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343 | ret |
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344 | |||
345 | |||
247 | serge | 346 | |
1 | ha | 347 | filesave: |
348 | ;---------------------------------------------------------- |
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349 | ; |
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350 | ; filesave - sys floppy |
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351 | ; |
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352 | ; eax points to filename 11 chars |
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353 | ; |
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354 | ; eax ; pointer to file name |
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355 | ; ebx ; buffer |
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356 | ; ecx ; count to write in bytes |
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357 | ; edx ; 0 create new , 1 append |
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358 | ; |
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359 | ;----------------------------------------------------------- |
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360 | |||
361 | sub esp,32 |
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362 | call expand_filename |
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363 | test edx,edx |
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364 | jnz fsdel |
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365 | pusha |
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366 | call filedelete |
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367 | popa |
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368 | |||
369 | fsdel: |
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370 | |||
371 | call ramdisk_free_space |
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372 | cmp ecx,edi |
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373 | jbe rd_do_save |
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374 | add esp,32 |
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375 | mov eax,8 ;disk full |
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376 | ret |
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377 | |||
378 | rd_do_save: |
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379 | |||
380 | push eax ebx ecx edx esi edi |
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381 | |||
381 | serge | 382 | mov edi,RAMDISK+512*18+512 ;Point at directory |
1 | ha | 383 | mov edx,224 +1 |
384 | ; find an empty spot for filename in the root dir |
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385 | l20ds: |
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386 | dec edx |
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387 | jz frnoreadds |
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388 | l21ds: |
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389 | cmp [edi],byte 0xE5 |
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390 | jz fifoundds |
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391 | cmp [edi],byte 0x0 |
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392 | jz fifoundds |
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393 | add edi,32 ; Advance to next entry |
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394 | jmp l20ds |
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395 | fifoundds: |
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396 | |||
397 | push edi ; move the filename to root dir |
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398 | mov esi,[esp+4+20] |
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399 | mov ecx,11 |
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400 | cld |
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401 | rep movsb |
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402 | pop edi |
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403 | mov edx,edi |
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404 | add edx,11+0xf ; edx <- cluster save position |
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405 | mov ebx,[esp+12] ; save file size |
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406 | mov [edi+28],ebx |
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407 | mov [edi+11],byte 0x20 ; attribute |
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408 | ; Ivan Poddubny 11/12/2003: |
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409 | call get_date_for_file ; from FAT32.INC |
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410 | mov [edi+24],ax ; date |
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411 | call get_time_for_file ; from FAT32.INC |
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412 | mov [edi+22],ax ; time |
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413 | ; End |
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381 | serge | 414 | mov edi,RAMDISK_FAT ;pointer to first cluster |
1 | ha | 415 | mov ecx,2849 |
416 | cld |
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417 | frnewds: |
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418 | xor ax,ax |
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419 | repne scasw |
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420 | mov ebx,2848 |
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421 | sub ebx,ecx |
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422 | mov [edx],bx ; save next cluster pos. to prev cl. |
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423 | mov edx,edi ; next save pos abs mem add |
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424 | dec edx |
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425 | dec edx |
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426 | call fdc_filesave |
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427 | pusha ; move save to floppy cluster |
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428 | add ebx,31 |
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429 | shl ebx,9 |
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381 | serge | 430 | add ebx,RAMDISK |
1 | ha | 431 | mov eax,[esp+32+16] |
432 | mov ecx,512 |
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433 | call memmove |
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434 | popa |
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435 | |||
436 | mov eax,[esp+12] |
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437 | cmp eax,512 |
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48 | halyavin | 438 | jbe flnsa |
1 | ha | 439 | sub eax,512 |
440 | mov [esp+12],eax |
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78 | diamond | 441 | add dword [esp+16], 512 |
1 | ha | 442 | jmp frnewds |
443 | |||
444 | flnsa: |
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78 | diamond | 445 | mov [edi-2],word 4095 ; mark end of file - last cluster |
1 | ha | 446 | |
447 | frnoreadds: |
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448 | |||
449 | pop edi esi edx ecx ebx eax |
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450 | add esp,32 |
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451 | |||
19 | mario79 | 452 | ; pusha |
453 | ; cli |
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454 | ; call fdc_commitfile |
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455 | ; sti |
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456 | ; popa |
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1 | ha | 457 | |
458 | xor eax,eax ;ok write |
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459 | ret |
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460 | |||
461 | rd_findfile: |
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462 | ;by Mihasik |
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463 | ;IN: eax - pointer to filename OUT: filestring+11 in edi or notZero in flags and fnf in eax,ebx |
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464 | |||
381 | serge | 465 | mov edi,RAMDISK+512*18+512 ;Point at directory |
1 | ha | 466 | cld |
467 | rd_newsearch: |
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468 | mov esi,eax |
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469 | mov ecx,11 |
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470 | rep cmpsb |
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471 | je rd_ff |
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472 | add cl,21 |
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473 | add edi,ecx |
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381 | serge | 474 | cmp edi,RAMDISK+512*33 |
1 | ha | 475 | jb rd_newsearch |
476 | mov eax,5 ;if file not found - eax=5 |
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477 | xor ebx,ebx |
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247 | serge | 478 | dec ebx ;ebx=0xffffffff and zf=0 |
1 | ha | 479 | rd_ff: |
247 | serge | 480 | ret |
1 | ha | 481 | |
71 | diamond | 482 | ; \begin{diamond} |
483 | |||
484 | uni2ansi_str: |
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485 | ; convert UNICODE zero-terminated string to ASCII-string (codepage 866) |
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486 | ; in: esi->source, edi->buffer (may be esi=edi) |
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487 | ; destroys: eax,esi,edi |
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83 | diamond | 488 | lodsw |
489 | test ax, ax |
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490 | jz .done |
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491 | cmp ax, 0x80 |
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492 | jb .ascii |
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493 | cmp ax, 0x401 |
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494 | jz .yo1 |
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495 | cmp ax, 0x451 |
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496 | jz .yo2 |
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497 | cmp ax, 0x410 |
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498 | jb .unk |
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499 | cmp ax, 0x440 |
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500 | jb .rus1 |
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501 | cmp ax, 0x450 |
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502 | jb .rus2 |
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71 | diamond | 503 | .unk: |
83 | diamond | 504 | mov al, '_' |
505 | jmp .doit |
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71 | diamond | 506 | .yo1: |
83 | diamond | 507 | mov al, 'ð' |
508 | jmp .doit |
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71 | diamond | 509 | .yo2: |
83 | diamond | 510 | mov al, 'ñ' |
511 | jmp .doit |
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71 | diamond | 512 | .rus1: |
513 | ; 0x410-0x43F -> 0x80-0xAF |
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83 | diamond | 514 | add al, 0x70 |
515 | jmp .doit |
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71 | diamond | 516 | .rus2: |
75 | diamond | 517 | ; 0x440-0x44F -> 0xE0-0xEF |
83 | diamond | 518 | add al, 0xA0 |
71 | diamond | 519 | .ascii: |
520 | .doit: |
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83 | diamond | 521 | stosb |
522 | jmp uni2ansi_str |
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71 | diamond | 523 | .done: |
83 | diamond | 524 | mov byte [edi], 0 |
525 | ret |
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71 | diamond | 526 | |
75 | diamond | 527 | ansi2uni_char: |
528 | ; convert ANSI character in al to UNICODE character in ax, using cp866 encoding |
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529 | mov ah, 0 |
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530 | ; 0x00-0x7F - trivial map |
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531 | cmp al, 0x80 |
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532 | jb .ret |
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533 | ; 0x80-0xAF -> 0x410-0x43F |
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534 | cmp al, 0xB0 |
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535 | jae @f |
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536 | add ax, 0x410-0x80 |
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537 | .ret: |
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538 | ret |
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539 | @@: |
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540 | ; 0xE0-0xEF -> 0x440-0x44F |
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541 | cmp al, 0xE0 |
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542 | jb .unk |
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543 | cmp al, 0xF0 |
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544 | jae @f |
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545 | add ax, 0x440-0xE0 |
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546 | ret |
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547 | ; 0xF0 -> 0x401 |
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548 | ; 0xF1 -> 0x451 |
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549 | @@: |
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550 | cmp al, 'ð' |
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551 | jz .yo1 |
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552 | cmp al, 'ñ' |
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553 | jz .yo2 |
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554 | .unk: |
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555 | mov al, '_' ; ah=0 |
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556 | ret |
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557 | .yo1: |
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558 | mov ax, 0x401 |
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559 | ret |
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560 | .yo2: |
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561 | mov ax, 0x451 |
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562 | ret |
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563 | |||
71 | diamond | 564 | char_toupper: |
565 | ; convert character to uppercase, using cp866 encoding |
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566 | ; in: al=symbol |
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567 | ; out: al=converted symbol |
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83 | diamond | 568 | cmp al, 'a' |
569 | jb .ret |
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570 | cmp al, 'z' |
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571 | jbe .az |
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572 | cmp al, ' ' |
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573 | jb .ret |
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574 | cmp al, 'à' |
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575 | jb .rus1 |
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576 | cmp al, 'ï' |
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577 | ja .ret |
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71 | diamond | 578 | ; 0xE0-0xEF -> 0x90-0x9F |
83 | diamond | 579 | sub al, 'à'-'' |
71 | diamond | 580 | .ret: |
83 | diamond | 581 | ret |
71 | diamond | 582 | .rus1: |
583 | ; 0xA0-0xAF -> 0x80-0x8F |
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584 | .az: |
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83 | diamond | 585 | and al, not 0x20 |
586 | ret |
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71 | diamond | 587 | |
588 | fat_get_name: |
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589 | ; in: edi->FAT entry |
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590 | ; out: CF=1 - no valid entry |
||
591 | ; else CF=0 and ebp->ASCIIZ-name |
||
592 | ; (maximum length of filename is 255 (wide) symbols without trailing 0, |
||
593 | ; but implementation requires buffer 261 words) |
||
594 | ; destroys eax |
||
83 | diamond | 595 | cmp byte [edi], 0 |
596 | jz .no |
||
597 | cmp byte [edi], 0xE5 |
||
598 | jnz @f |
||
71 | diamond | 599 | .no: |
83 | diamond | 600 | stc |
601 | ret |
||
71 | diamond | 602 | @@: |
83 | diamond | 603 | cmp byte [edi+11], 0xF |
604 | jz .longname |
||
399 | diamond | 605 | test byte [edi+11], 8 |
606 | jnz .no |
||
83 | diamond | 607 | push ecx |
247 | serge | 608 | push edi ebp |
78 | diamond | 609 | test byte [ebp-4], 1 |
75 | diamond | 610 | jnz .unicode_short |
247 | serge | 611 | |
612 | mov eax, [edi] |
||
613 | mov ecx, [edi+4] |
||
614 | mov [ebp], eax |
||
615 | mov [ebp+4], ecx |
||
616 | |||
617 | mov ecx, 8 |
||
71 | diamond | 618 | @@: |
247 | serge | 619 | cmp byte [ebp+ecx-1], ' ' |
620 | loope @b |
||
621 | |||
622 | mov eax, [edi+8] |
||
623 | cmp al, ' ' |
||
624 | je .done |
||
625 | shl eax, 8 |
||
626 | mov al, '.' |
||
627 | |||
628 | lea ebp, [ebp+ecx+1] |
||
629 | mov [ebp], eax |
||
83 | diamond | 630 | mov ecx, 3 |
71 | diamond | 631 | @@: |
247 | serge | 632 | rol eax, 8 |
633 | cmp al, ' ' |
||
634 | jne .done |
||
635 | loop @b |
||
636 | dec ebp |
||
637 | .done: |
||
638 | and byte [ebp+ecx+1], 0 ; CF=0 |
||
83 | diamond | 639 | pop ebp edi ecx |
640 | ret |
||
75 | diamond | 641 | .unicode_short: |
247 | serge | 642 | mov ecx, 8 |
643 | push ecx |
||
75 | diamond | 644 | @@: |
645 | mov al, [edi] |
||
646 | inc edi |
||
647 | call ansi2uni_char |
||
648 | mov [ebp], ax |
||
649 | inc ebp |
||
650 | inc ebp |
||
651 | loop @b |
||
652 | pop ecx |
||
653 | @@: |
||
83 | diamond | 654 | cmp word [ebp-2], ' ' |
655 | jnz @f |
||
656 | dec ebp |
||
657 | dec ebp |
||
658 | loop @b |
||
75 | diamond | 659 | @@: |
83 | diamond | 660 | mov word [ebp], '.' |
661 | inc ebp |
||
662 | inc ebp |
||
663 | mov ecx, 3 |
||
664 | push ecx |
||
75 | diamond | 665 | @@: |
83 | diamond | 666 | mov al, [edi] |
667 | inc edi |
||
668 | call ansi2uni_char |
||
669 | mov [ebp], ax |
||
75 | diamond | 670 | inc ebp |
671 | inc ebp |
||
672 | loop @b |
||
673 | pop ecx |
||
674 | @@: |
||
83 | diamond | 675 | cmp word [ebp-2], ' ' |
676 | jnz @f |
||
677 | dec ebp |
||
678 | dec ebp |
||
679 | loop @b |
||
680 | dec ebp |
||
681 | dec ebp |
||
75 | diamond | 682 | @@: |
83 | diamond | 683 | and word [ebp], 0 ; CF=0 |
684 | pop ebp edi ecx |
||
685 | ret |
||
71 | diamond | 686 | .longname: |
687 | ; LFN |
||
83 | diamond | 688 | mov al, byte [edi] |
689 | and eax, 0x3F |
||
690 | dec eax |
||
691 | cmp al, 20 |
||
692 | jae .no ; ignore invalid entries |
||
693 | mov word [ebp+260*2], 0 ; force null-terminating for orphans |
||
694 | imul eax, 13*2 |
||
695 | add ebp, eax |
||
696 | test byte [edi], 0x40 |
||
697 | jz @f |
||
698 | mov word [ebp+13*2], 0 |
||
71 | diamond | 699 | @@: |
83 | diamond | 700 | push eax |
71 | diamond | 701 | ; now copy name from edi to ebp ... |
83 | diamond | 702 | mov eax, [edi+1] |
703 | mov [ebp], eax ; symbols 1,2 |
||
704 | mov eax, [edi+5] |
||
705 | mov [ebp+4], eax ; 3,4 |
||
706 | mov eax, [edi+9] |
||
707 | mov [ebp+8], ax ; 5 |
||
708 | mov eax, [edi+14] |
||
709 | mov [ebp+10], eax ; 6,7 |
||
710 | mov eax, [edi+18] |
||
711 | mov [ebp+14], eax ; 8,9 |
||
712 | mov eax, [edi+22] |
||
713 | mov [ebp+18], eax ; 10,11 |
||
714 | mov eax, [edi+28] |
||
715 | mov [ebp+22], eax ; 12,13 |
||
71 | diamond | 716 | ; ... done |
83 | diamond | 717 | pop eax |
718 | sub ebp, eax |
||
719 | test eax, eax |
||
720 | jz @f |
||
71 | diamond | 721 | ; if this is not first entry, more processing required |
83 | diamond | 722 | stc |
723 | ret |
||
71 | diamond | 724 | @@: |
725 | ; if this is first entry: |
||
78 | diamond | 726 | test byte [ebp-4], 1 |
75 | diamond | 727 | jnz .ret |
71 | diamond | 728 | ; buffer at ebp contains UNICODE name, convert it to ANSI |
83 | diamond | 729 | push esi edi |
730 | mov esi, ebp |
||
731 | mov edi, ebp |
||
732 | call uni2ansi_str |
||
733 | pop edi esi |
||
75 | diamond | 734 | .ret: |
83 | diamond | 735 | clc |
736 | ret |
||
71 | diamond | 737 | |
738 | fat_compare_name: |
||
739 | ; compares ASCIIZ-names, case-insensitive (cp866 encoding) |
||
740 | ; in: esi->name, ebp->name |
||
741 | ; out: if names match: ZF=1 and esi->next component of name |
||
742 | ; else: ZF=0, esi is not changed |
||
743 | ; destroys eax |
||
83 | diamond | 744 | push ebp esi |
71 | diamond | 745 | .loop: |
83 | diamond | 746 | mov al, [ebp] |
747 | inc ebp |
||
748 | call char_toupper |
||
749 | push eax |
||
750 | lodsb |
||
751 | call char_toupper |
||
752 | cmp al, [esp] |
||
753 | jnz .done |
||
754 | pop eax |
||
755 | test al, al |
||
756 | jnz .loop |
||
757 | dec esi |
||
758 | pop eax |
||
759 | pop ebp |
||
760 | xor eax, eax ; set ZF flag |
||
761 | ret |
||
71 | diamond | 762 | .done: |
83 | diamond | 763 | cmp al, '/' |
764 | jnz @f |
||
765 | cmp byte [esp], 0 |
||
766 | jnz @f |
||
767 | mov [esp+4], esi |
||
71 | diamond | 768 | @@: |
83 | diamond | 769 | pop eax |
770 | pop esi ebp |
||
771 | ret |
||
71 | diamond | 772 | |
75 | diamond | 773 | fat_time_to_bdfe: |
774 | ; in: eax=FAT time |
||
775 | ; out: eax=BDFE time |
||
83 | diamond | 776 | push ecx edx |
777 | mov ecx, eax |
||
778 | mov edx, eax |
||
779 | shr eax, 11 |
||
780 | shl eax, 16 ; hours |
||
781 | and edx, 0x1F |
||
782 | add edx, edx |
||
783 | mov al, dl ; seconds |
||
784 | shr ecx, 5 |
||
785 | and ecx, 0x3F |
||
786 | mov ah, cl ; minutes |
||
787 | pop edx ecx |
||
788 | ret |
||
75 | diamond | 789 | |
790 | fat_date_to_bdfe: |
||
83 | diamond | 791 | push ecx edx |
792 | mov ecx, eax |
||
793 | mov edx, eax |
||
794 | shr eax, 9 |
||
795 | add ax, 1980 |
||
796 | shl eax, 16 ; year |
||
797 | and edx, 0x1F |
||
798 | mov al, dl ; day |
||
799 | shr ecx, 5 |
||
800 | and ecx, 0xF |
||
801 | mov ah, cl ; month |
||
802 | pop edx ecx |
||
803 | ret |
||
75 | diamond | 804 | |
86 | diamond | 805 | bdfe_to_fat_time: |
806 | push edx |
||
807 | mov edx, eax |
||
808 | shr eax, 16 |
||
809 | and dh, 0x3F |
||
810 | shl eax, 6 |
||
811 | or al, dh |
||
812 | shr dl, 1 |
||
813 | and dl, 0x1F |
||
814 | shl eax, 5 |
||
815 | or al, dl |
||
816 | pop edx |
||
817 | ret |
||
818 | |||
819 | bdfe_to_fat_date: |
||
820 | push edx |
||
821 | mov edx, eax |
||
822 | shr eax, 16 |
||
823 | sub ax, 1980 |
||
824 | and dh, 0xF |
||
825 | shl eax, 4 |
||
826 | or al, dh |
||
827 | and dl, 0x1F |
||
828 | shl eax, 5 |
||
829 | or al, dl |
||
830 | pop edx |
||
831 | ret |
||
832 | |||
75 | diamond | 833 | fat_entry_to_bdfe: |
834 | ; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi |
||
835 | ; destroys eax |
||
86 | diamond | 836 | mov eax, [ebp-4] |
837 | mov [esi+4], eax ; ASCII/UNICODE name |
||
838 | fat_entry_to_bdfe2: |
||
75 | diamond | 839 | movzx eax, byte [edi+11] |
840 | mov [esi], eax ; attributes |
||
841 | movzx eax, word [edi+14] |
||
842 | call fat_time_to_bdfe |
||
843 | mov [esi+8], eax ; creation time |
||
844 | movzx eax, word [edi+16] |
||
845 | call fat_date_to_bdfe |
||
846 | mov [esi+12], eax ; creation date |
||
847 | and dword [esi+16], 0 ; last access time is not supported on FAT |
||
848 | movzx eax, word [edi+18] |
||
849 | call fat_date_to_bdfe |
||
850 | mov [esi+20], eax ; last access date |
||
851 | movzx eax, word [edi+22] |
||
852 | call fat_time_to_bdfe |
||
853 | mov [esi+24], eax ; last write time |
||
854 | movzx eax, word [edi+24] |
||
855 | call fat_date_to_bdfe |
||
856 | mov [esi+28], eax ; last write date |
||
857 | mov eax, [edi+28] |
||
858 | mov [esi+32], eax ; file size (low dword) |
||
859 | xor eax, eax |
||
860 | mov [esi+36], eax ; file size (high dword) |
||
86 | diamond | 861 | test ebp, ebp |
862 | jz .ret |
||
75 | diamond | 863 | push ecx edi |
864 | lea edi, [esi+40] |
||
865 | mov esi, ebp |
||
78 | diamond | 866 | test byte [esi-4], 1 |
867 | jz .ansi |
||
868 | mov ecx, 260/2 |
||
75 | diamond | 869 | rep movsd |
78 | diamond | 870 | mov [edi-2], ax |
871 | @@: |
||
75 | diamond | 872 | mov esi, edi |
873 | pop edi ecx |
||
86 | diamond | 874 | .ret: |
75 | diamond | 875 | ret |
78 | diamond | 876 | .ansi: |
877 | mov ecx, 264/4 |
||
878 | rep movsd |
||
879 | mov [edi-1], al |
||
880 | jmp @b |
||
75 | diamond | 881 | |
86 | diamond | 882 | bdfe_to_fat_entry: |
883 | ; convert BDFE at edx to FAT entry at edi |
||
884 | ; destroys eax |
||
885 | ; attributes byte |
||
886 | test byte [edi+11], 8 ; volume label? |
||
887 | jnz @f |
||
888 | mov al, [edx] |
||
889 | and al, 0x27 |
||
890 | and byte [edi+11], 0x10 |
||
891 | or byte [edi+11], al |
||
892 | @@: |
||
893 | mov eax, [edx+8] |
||
894 | call bdfe_to_fat_time |
||
895 | mov [edi+14], ax ; creation time |
||
896 | mov eax, [edx+12] |
||
897 | call bdfe_to_fat_date |
||
898 | mov [edi+16], ax ; creation date |
||
899 | mov eax, [edx+20] |
||
900 | call bdfe_to_fat_date |
||
901 | mov [edi+18], ax ; last access date |
||
902 | mov eax, [edx+24] |
||
903 | call bdfe_to_fat_time |
||
904 | mov [edi+22], ax ; last write time |
||
905 | mov eax, [edx+28] |
||
906 | call bdfe_to_fat_date |
||
907 | mov [edi+24], ax ; last write date |
||
908 | ret |
||
909 | |||
910 | ramdisk_root_first: |
||
381 | serge | 911 | mov edi, RAMDISK+512*19 |
86 | diamond | 912 | clc |
913 | ret |
||
914 | ramdisk_root_next: |
||
915 | add edi, 0x20 |
||
381 | serge | 916 | cmp edi, RAMDISK+512*33 |
86 | diamond | 917 | cmc |
918 | ret |
||
919 | |||
91 | diamond | 920 | ramdisk_root_extend_dir: |
921 | stc |
||
922 | ret |
||
923 | |||
171 | diamond | 924 | uglobal |
925 | ; this is for delete support |
||
926 | rd_prev_sector dd ? |
||
927 | rd_prev_prev_sector dd ? |
||
928 | endg |
||
929 | |||
91 | diamond | 930 | ramdisk_notroot_next: |
931 | add edi, 0x20 |
||
932 | test edi, 0x1FF |
||
933 | jz ramdisk_notroot_next_sector |
||
934 | ret ; CF=0 |
||
935 | ramdisk_notroot_next_sector: |
||
936 | push ecx |
||
937 | mov ecx, [eax] |
||
171 | diamond | 938 | push [rd_prev_sector] |
939 | pop [rd_prev_prev_sector] |
||
940 | mov [rd_prev_sector], ecx |
||
381 | serge | 941 | mov ecx, [ecx*2+RAMDISK_FAT] |
91 | diamond | 942 | and ecx, 0xFFF |
943 | cmp ecx, 2849 |
||
944 | jae ramdisk_notroot_first.err2 |
||
945 | mov [eax], ecx |
||
946 | pop ecx |
||
947 | ramdisk_notroot_first: |
||
948 | mov eax, [eax] |
||
949 | cmp eax, 2 |
||
950 | jb .err |
||
951 | cmp eax, 2849 |
||
952 | jae .err |
||
953 | shl eax, 9 |
||
381 | serge | 954 | lea edi, [eax+(31 shl 9)+RAMDISK] |
91 | diamond | 955 | clc |
956 | ret |
||
957 | .err2: |
||
958 | pop ecx |
||
959 | .err: |
||
960 | stc |
||
961 | ret |
||
962 | ramdisk_notroot_next_write: |
||
963 | test edi, 0x1FF |
||
964 | jz ramdisk_notroot_next_sector |
||
965 | ramdisk_root_next_write: |
||
966 | ret |
||
967 | |||
968 | ramdisk_notroot_extend_dir: |
||
969 | pusha |
||
970 | xor eax, eax |
||
381 | serge | 971 | mov edi, RAMDISK_FAT |
91 | diamond | 972 | mov ecx, 2849 |
973 | repnz scasw |
||
974 | jnz .notfound |
||
975 | mov word [edi-2], 0xFFF |
||
381 | serge | 976 | sub edi, RAMDISK_FAT |
91 | diamond | 977 | shr edi, 1 |
978 | dec edi |
||
979 | mov eax, [esp+28] |
||
980 | mov ecx, [eax] |
||
381 | serge | 981 | mov [RAMDISK_FAT+ecx*2], di |
91 | diamond | 982 | mov [eax], edi |
983 | shl edi, 9 |
||
381 | serge | 984 | add edi, (31 shl 9)+RAMDISK |
91 | diamond | 985 | mov [esp], edi |
986 | xor eax, eax |
||
987 | mov ecx, 128 |
||
988 | rep stosd |
||
989 | popa |
||
990 | clc |
||
991 | ret |
||
992 | .notfound: |
||
993 | popa |
||
994 | stc |
||
995 | ret |
||
996 | |||
71 | diamond | 997 | rd_find_lfn: |
998 | ; in: esi->name |
||
999 | ; out: CF=1 - file not found |
||
1000 | ; else CF=0 and edi->direntry |
||
86 | diamond | 1001 | push esi edi |
91 | diamond | 1002 | push 0 |
86 | diamond | 1003 | push ramdisk_root_first |
1004 | push ramdisk_root_next |
||
91 | diamond | 1005 | .loop: |
86 | diamond | 1006 | call fat_find_lfn |
1007 | jc .notfound |
||
1008 | cmp byte [esi], 0 |
||
91 | diamond | 1009 | jz .found |
1010 | test byte [edi+11], 10h |
||
1011 | jz .notfound |
||
1012 | movzx eax, word [edi+26] |
||
1013 | mov [esp+8], eax |
||
1014 | mov dword [esp+4], ramdisk_notroot_first |
||
1015 | mov dword [esp], ramdisk_notroot_next |
||
1016 | jmp .loop |
||
1017 | .notfound: |
||
86 | diamond | 1018 | add esp, 12 |
1019 | pop edi esi |
||
78 | diamond | 1020 | stc |
1021 | ret |
||
91 | diamond | 1022 | .found: |
1023 | mov eax, [esp+8] |
||
1024 | add esp, 16 ; CF=0 |
||
1025 | pop esi |
||
1026 | ret |
||
71 | diamond | 1027 | |
1028 | ;---------------------------------------------------------------- |
||
1029 | ; |
||
1030 | ; fs_RamdiskRead - LFN variant for reading sys floppy |
||
1031 | ; |
||
1032 | ; esi points to filename |
||
1033 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
1034 | ; may be ebx=0 - start from first byte |
||
1035 | ; ecx number of bytes to read, 0+ |
||
1036 | ; edx mem location to return data |
||
1037 | ; |
||
77 | diamond | 1038 | ; ret ebx = bytes read or 0xffffffff file not found |
71 | diamond | 1039 | ; eax = 0 ok read or other = errormsg |
1040 | ; |
||
1041 | ;-------------------------------------------------------------- |
||
1042 | fs_RamdiskRead: |
||
75 | diamond | 1043 | cmp byte [esi], 0 |
1044 | jnz @f |
||
1045 | or ebx, -1 |
||
1046 | mov eax, 10 ; access denied |
||
1047 | ret |
||
71 | diamond | 1048 | @@: |
75 | diamond | 1049 | push edi |
1050 | call rd_find_lfn |
||
1051 | jnc .found |
||
1052 | pop edi |
||
1053 | or ebx, -1 |
||
1054 | mov eax, 5 ; file not found |
||
1055 | ret |
||
71 | diamond | 1056 | .found: |
75 | diamond | 1057 | test ebx, ebx |
1058 | jz .l1 |
||
1059 | cmp dword [ebx+4], 0 |
||
1060 | jz @f |
||
77 | diamond | 1061 | xor ebx, ebx |
71 | diamond | 1062 | .reteof: |
75 | diamond | 1063 | mov eax, 6 ; EOF |
1064 | pop edi |
||
1065 | ret |
||
71 | diamond | 1066 | @@: |
75 | diamond | 1067 | mov ebx, [ebx] |
71 | diamond | 1068 | .l1: |
77 | diamond | 1069 | push ecx edx |
1070 | push 0 |
||
1071 | mov eax, [edi+28] |
||
1072 | sub eax, ebx |
||
1073 | jb .eof |
||
1074 | cmp eax, ecx |
||
1075 | jae @f |
||
1076 | mov ecx, eax |
||
1077 | mov byte [esp], 6 ; EOF |
||
1078 | @@: |
||
75 | diamond | 1079 | movzx edi, word [edi+26] ; cluster |
71 | diamond | 1080 | .new: |
75 | diamond | 1081 | jecxz .done |
1082 | test edi, edi |
||
1083 | jz .eof |
||
1084 | cmp edi, 0xFF8 |
||
1085 | jae .eof |
||
1086 | lea eax, [edi+31] ; bootsector+2*fat+filenames |
||
1087 | shl eax, 9 ; *512 |
||
381 | serge | 1088 | add eax, RAMDISK ; image base |
71 | diamond | 1089 | ; now eax points to data of cluster |
75 | diamond | 1090 | sub ebx, 512 |
1091 | jae .skip |
||
1092 | lea eax, [eax+ebx+512] |
||
1093 | neg ebx |
||
1094 | push ecx |
||
1095 | cmp ecx, ebx |
||
1096 | jbe @f |
||
1097 | mov ecx, ebx |
||
71 | diamond | 1098 | @@: |
75 | diamond | 1099 | mov ebx, edx |
1100 | call memmove |
||
1101 | add edx, ecx |
||
1102 | sub [esp], ecx |
||
1103 | pop ecx |
||
1104 | xor ebx, ebx |
||
71 | diamond | 1105 | .skip: |
381 | serge | 1106 | movzx edi, word [edi*2+RAMDISK_FAT] ; find next cluster from FAT |
75 | diamond | 1107 | jmp .new |
71 | diamond | 1108 | .eof: |
77 | diamond | 1109 | mov ebx, edx |
1110 | pop eax edx ecx |
||
1111 | sub ebx, edx |
||
75 | diamond | 1112 | jmp .reteof |
71 | diamond | 1113 | .done: |
77 | diamond | 1114 | mov ebx, edx |
1115 | pop eax edx ecx edi |
||
1116 | sub ebx, edx |
||
75 | diamond | 1117 | ret |
71 | diamond | 1118 | |
75 | diamond | 1119 | ;---------------------------------------------------------------- |
1120 | ; |
||
1121 | ; fs_RamdiskReadFolder - LFN variant for reading sys floppy folder |
||
1122 | ; |
||
1123 | ; esi points to filename; only root is folder on ramdisk |
||
78 | diamond | 1124 | ; ebx pointer to structure 32-bit number = first wanted block |
1125 | ; & flags (bitfields) |
||
1126 | ; flags: bit 0: 0=ANSI names, 1=UNICODE names |
||
75 | diamond | 1127 | ; ecx number of blocks to read, 0+ |
1128 | ; edx mem location to return data |
||
1129 | ; |
||
1130 | ; ret ebx = size or 0xffffffff file not found |
||
1131 | ; eax = 0 ok read or other = errormsg |
||
1132 | ; |
||
1133 | ;-------------------------------------------------------------- |
||
1134 | fs_RamdiskReadFolder: |
||
91 | diamond | 1135 | push edi |
75 | diamond | 1136 | cmp byte [esi], 0 |
91 | diamond | 1137 | jz .root |
1138 | call rd_find_lfn |
||
1139 | jnc .found |
||
1140 | pop edi |
||
75 | diamond | 1141 | or ebx, -1 |
91 | diamond | 1142 | mov eax, ERROR_FILE_NOT_FOUND |
75 | diamond | 1143 | ret |
91 | diamond | 1144 | .found: |
1145 | test byte [edi+11], 0x10 |
||
1146 | jnz .found_dir |
||
1147 | pop edi |
||
1148 | or ebx, -1 |
||
1149 | mov eax, ERROR_ACCESS_DENIED |
||
1150 | ret |
||
1151 | .found_dir: |
||
1152 | movzx eax, word [edi+26] |
||
1153 | add eax, 31 |
||
1154 | push 0 |
||
1155 | jmp .doit |
||
1156 | .root: |
||
1157 | mov eax, 19 |
||
1158 | push 14 |
||
1159 | .doit: |
||
1160 | push esi ecx ebp |
||
1161 | sub esp, 262*2 ; reserve space for LFN |
||
1162 | mov ebp, esp |
||
1163 | push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names |
||
1164 | mov ebx, [ebx] |
||
75 | diamond | 1165 | ; init header |
91 | diamond | 1166 | push eax ecx |
75 | diamond | 1167 | mov edi, edx |
1168 | mov ecx, 32/4 |
||
1169 | xor eax, eax |
||
1170 | rep stosd |
||
1171 | mov byte [edx], 1 ; version |
||
91 | diamond | 1172 | pop ecx eax |
75 | diamond | 1173 | mov esi, edi ; esi points to block of data of folder entry (BDFE) |
91 | diamond | 1174 | .main_loop: |
1175 | mov edi, eax |
||
1176 | shl edi, 9 |
||
381 | serge | 1177 | add edi, RAMDISK |
91 | diamond | 1178 | push eax |
75 | diamond | 1179 | .l1: |
1180 | call fat_get_name |
||
1181 | jc .l2 |
||
1182 | cmp byte [edi+11], 0xF |
||
91 | diamond | 1183 | jnz .do_bdfe |
75 | diamond | 1184 | add edi, 0x20 |
91 | diamond | 1185 | test edi, 0x1FF |
1186 | jnz .do_bdfe |
||
1187 | pop eax |
||
1188 | inc eax |
||
1189 | dec byte [esp+262*2+16] |
||
1190 | jz .done |
||
1191 | jns @f |
||
1192 | ; read next sector from FAT |
||
381 | serge | 1193 | mov eax, [(eax-31-1)*2+RAMDISK_FAT] |
91 | diamond | 1194 | and eax, 0xFFF |
1195 | cmp eax, 0xFF8 |
||
1196 | jae .done |
||
1197 | add eax, 31 |
||
1198 | mov byte [esp+262*2+16], 0 |
||
75 | diamond | 1199 | @@: |
91 | diamond | 1200 | mov edi, eax |
1201 | shl edi, 9 |
||
381 | serge | 1202 | add edi, RAMDISK |
91 | diamond | 1203 | push eax |
1204 | .do_bdfe: |
||
75 | diamond | 1205 | inc dword [edx+8] ; new file found |
1206 | dec ebx |
||
1207 | jns .l2 |
||
1208 | dec ecx |
||
1209 | js .l2 |
||
1210 | inc dword [edx+4] ; new file block copied |
||
1211 | call fat_entry_to_bdfe |
||
1212 | .l2: |
||
1213 | add edi, 0x20 |
||
91 | diamond | 1214 | test edi, 0x1FF |
1215 | jnz .l1 |
||
1216 | pop eax |
||
1217 | inc eax |
||
1218 | dec byte [esp+262*2+16] |
||
1219 | jz .done |
||
1220 | jns @f |
||
1221 | ; read next sector from FAT |
||
381 | serge | 1222 | mov eax, [(eax-31-1)*2+RAMDISK_FAT] |
91 | diamond | 1223 | and eax, 0xFFF |
1224 | cmp eax, 0xFF8 |
||
1225 | jae .done |
||
1226 | add eax, 31 |
||
1227 | mov byte [esp+262*2+16], 0 |
||
1228 | @@: |
||
1229 | jmp .main_loop |
||
1230 | .done: |
||
75 | diamond | 1231 | add esp, 262*2+4 |
1232 | pop ebp |
||
77 | diamond | 1233 | mov ebx, [edx+4] |
75 | diamond | 1234 | xor eax, eax |
1235 | dec ecx |
||
1236 | js @f |
||
1237 | mov al, ERROR_END_OF_FILE |
||
1238 | @@: |
||
91 | diamond | 1239 | pop ecx esi edi edi |
75 | diamond | 1240 | ret |
1241 | |||
83 | diamond | 1242 | iglobal |
1243 | label fat_legal_chars byte |
||
1244 | ; 0 = not allowed |
||
1245 | ; 1 = allowed only in long names |
||
1246 | ; 3 = allowed |
||
1247 | times 32 db 0 |
||
1248 | ; ! " # $ % & ' ( ) * + , - . / |
||
1249 | db 1,3,0,3,3,3,3,3,3,3,0,1,1,3,3,0 |
||
1250 | ; 0 1 2 3 4 5 6 7 8 9 : ; < = > ? |
||
1251 | db 3,3,3,3,3,3,3,3,3,3,0,1,0,1,0,0 |
||
1252 | ; @ A B C D E F G H I J K L M N O |
||
1253 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
1254 | ; P Q R S T U V W X Y Z [ \ ] ^ _ |
||
1255 | db 3,3,3,3,3,3,3,3,3,3,3,1,0,1,3,3 |
||
1256 | ; ` a b c d e f g h i j k l m n o |
||
1257 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
1258 | ; p q r s t u v w x y z { | } ~ |
||
1259 | db 3,3,3,3,3,3,3,3,3,3,3,3,0,3,3,0 |
||
1260 | endg |
||
1261 | |||
1262 | fat_name_is_legal: |
||
1263 | ; in: esi->(long) name |
||
1264 | ; out: CF set <=> legal |
||
1265 | ; destroys eax |
||
1266 | push esi |
||
1267 | xor eax, eax |
||
1268 | @@: |
||
1269 | lodsb |
||
1270 | test al, al |
||
1271 | jz .done |
||
1272 | cmp al, 80h |
||
1273 | jae .big |
||
1274 | test [fat_legal_chars+eax], 1 |
||
1275 | jnz @b |
||
1276 | .err: |
||
1277 | pop esi |
||
1278 | clc |
||
1279 | ret |
||
1280 | .big: |
||
1281 | ; 0x80-0xAF, 0xE0-0xEF |
||
1282 | cmp al, 0xB0 |
||
1283 | jb @b |
||
1284 | cmp al, 0xE0 |
||
1285 | jb .err |
||
1286 | cmp al, 0xF0 |
||
1287 | jb @b |
||
1288 | jmp .err |
||
1289 | .done: |
||
1290 | sub esi, [esp] |
||
1291 | cmp esi, 257 |
||
1292 | pop esi |
||
1293 | ret |
||
1294 | |||
1295 | fat_next_short_name: |
||
1296 | ; in: edi->8+3 name |
||
1297 | ; out: name corrected |
||
1298 | ; CF=1 <=> error |
||
1299 | pushad |
||
1300 | mov ecx, 8 |
||
1301 | mov al, '~' |
||
1302 | std |
||
1303 | push edi |
||
1304 | add edi, 7 |
||
1305 | repnz scasb |
||
1306 | pop edi |
||
1307 | cld |
||
1308 | jz .tilde |
||
1309 | ; tilde is not found, insert "~1" at end |
||
1310 | add edi, 6 |
||
1311 | cmp word [edi], ' ' |
||
1312 | jnz .insert_tilde |
||
1313 | @@: dec edi |
||
1314 | cmp byte [edi], ' ' |
||
1315 | jz @b |
||
1316 | inc edi |
||
1317 | .insert_tilde: |
||
1318 | mov word [edi], '~1' |
||
1319 | popad |
||
1320 | ; clc ; CF already cleared |
||
1321 | ret |
||
1322 | .tilde: |
||
1323 | push edi |
||
1324 | add edi, 7 |
||
1325 | xor ecx, ecx |
||
1326 | @@: |
||
1327 | ; after tilde may be only digits and trailing spaces |
||
1328 | cmp byte [edi], '~' |
||
1329 | jz .break |
||
1330 | cmp byte [edi], ' ' |
||
1331 | jz .space |
||
1332 | cmp byte [edi], '9' |
||
1333 | jnz .found |
||
1334 | dec edi |
||
1335 | jmp @b |
||
1336 | .space: |
||
1337 | dec edi |
||
1338 | inc ecx |
||
1339 | jmp @b |
||
1340 | .found: |
||
1341 | inc byte [edi] |
||
1342 | .succ: |
||
1343 | pop edi |
||
1344 | popad |
||
1345 | clc |
||
1346 | ret |
||
1347 | .break: |
||
1348 | jecxz .noplace |
||
1349 | inc edi |
||
1350 | mov al, '1' |
||
1351 | @@: |
||
1352 | xchg al, [edi] |
||
1353 | inc edi |
||
1354 | cmp al, ' ' |
||
1355 | mov al, '0' |
||
1356 | jnz @b |
||
1357 | jmp .succ |
||
1358 | .noplace: |
||
1359 | dec edi |
||
1360 | cmp edi, [esp] |
||
1361 | jz .err |
||
1362 | add dword [esp], 8 |
||
1363 | mov word [edi], '~1' |
||
1364 | inc edi |
||
1365 | inc edi |
||
1366 | @@: |
||
1367 | mov byte [edi], '0' |
||
1368 | inc edi |
||
1369 | cmp edi, [esp] |
||
1370 | jb @b |
||
1371 | pop edi |
||
1372 | popad |
||
1373 | ;clc ; automatically |
||
1374 | ret |
||
1375 | .err: |
||
1376 | pop edi |
||
1377 | popad |
||
1378 | stc |
||
1379 | ret |
||
1380 | |||
1381 | fat_gen_short_name: |
||
1382 | ; in: esi->long name |
||
1383 | ; edi->buffer (8+3=11 chars) |
||
1384 | ; out: buffer filled |
||
1385 | pushad |
||
1386 | mov eax, ' ' |
||
1387 | push edi |
||
1388 | stosd |
||
1389 | stosd |
||
1390 | stosd |
||
1391 | pop edi |
||
1392 | xor eax, eax |
||
1393 | push 8 |
||
1394 | pop ebx |
||
1395 | lea ecx, [edi+8] |
||
1396 | .loop: |
||
1397 | lodsb |
||
1398 | test al, al |
||
1399 | jz .done |
||
1400 | call char_toupper |
||
1401 | cmp al, ' ' |
||
1402 | jz .space |
||
1403 | cmp al, 80h |
||
1404 | ja .big |
||
1405 | test [fat_legal_chars+eax], 2 |
||
1406 | jnz .symbol |
||
1407 | .inv_symbol: |
||
1408 | mov al, '_' |
||
1409 | or bh, 1 |
||
1410 | .symbol: |
||
1411 | cmp al, '.' |
||
1412 | jz .dot |
||
1413 | .normal_symbol: |
||
1414 | dec bl |
||
1415 | jns .store |
||
1416 | mov bl, 0 |
||
1417 | .space: |
||
1418 | or bh, 1 |
||
1419 | jmp .loop |
||
1420 | .store: |
||
1421 | stosb |
||
1422 | jmp .loop |
||
1423 | .big: |
||
1424 | cmp al, 0xB0 |
||
1425 | jb .normal_symbol |
||
1426 | cmp al, 0xE0 |
||
1427 | jb .inv_symbol |
||
1428 | cmp al, 0xF0 |
||
1429 | jb .normal_symbol |
||
1430 | jmp .inv_symbol |
||
1431 | .dot: |
||
1432 | test bh, 2 |
||
1433 | jz .firstdot |
||
1434 | pop ebx |
||
1435 | add ebx, edi |
||
1436 | sub ebx, ecx |
||
1437 | push ebx |
||
1438 | cmp edi, ecx |
||
1439 | jbe .skip |
||
1440 | @@: |
||
1441 | dec edi |
||
1442 | mov al, ' ' |
||
1443 | xchg al, [edi] |
||
1444 | dec ebx |
||
1445 | mov [ebx], al |
||
1446 | cmp edi, ecx |
||
1447 | ja @b |
||
1448 | .skip: |
||
1449 | mov bh, 3 |
||
1450 | jmp @f |
||
1451 | .firstdot: |
||
1452 | cmp bl, 8 |
||
1453 | jz .space |
||
1454 | push edi |
||
1455 | or bh, 2 |
||
1456 | @@: |
||
1457 | mov edi, ecx |
||
1458 | mov bl, 3 |
||
1459 | jmp .loop |
||
1460 | .done: |
||
1461 | test bh, 2 |
||
1462 | jz @f |
||
1463 | pop edi |
||
1464 | @@: |
||
1465 | lea edi, [ecx-8] |
||
1466 | test bh, 1 |
||
1467 | jz @f |
||
1468 | call fat_next_short_name |
||
1469 | @@: |
||
1470 | popad |
||
1471 | ret |
||
1472 | |||
1473 | ;---------------------------------------------------------------- |
||
1474 | ; |
||
321 | diamond | 1475 | ; fs_RamdiskRewrite - LFN variant for writing ramdisk |
1476 | ; fs_RamdiskCreateFolder - create folder on ramdisk |
||
83 | diamond | 1477 | ; |
321 | diamond | 1478 | ; esi points to file/folder name |
83 | diamond | 1479 | ; ebx ignored (reserved) |
321 | diamond | 1480 | ; ecx number of bytes to write, 0+ (ignored for folders) |
1481 | ; edx mem location to data (ignored for folders) |
||
83 | diamond | 1482 | ; |
1483 | ; ret ebx = number of written bytes |
||
1484 | ; eax = 0 ok read or other = errormsg |
||
1485 | ; |
||
1486 | ;-------------------------------------------------------------- |
||
1487 | @@: |
||
1488 | mov eax, ERROR_ACCESS_DENIED |
||
1489 | xor ebx, ebx |
||
1490 | ret |
||
1491 | |||
321 | diamond | 1492 | fs_RamdiskCreateFolder: |
1493 | mov al, 1 ; create folder |
||
1494 | jmp fs_RamdiskRewrite.common |
||
1495 | |||
83 | diamond | 1496 | fs_RamdiskRewrite: |
321 | diamond | 1497 | xor eax, eax ; create file |
1498 | .common: |
||
83 | diamond | 1499 | cmp byte [esi], 0 |
1500 | jz @b |
||
91 | diamond | 1501 | pushad |
1502 | xor ebp, ebp |
||
83 | diamond | 1503 | push esi |
1504 | @@: |
||
1505 | lodsb |
||
1506 | test al, al |
||
1507 | jz @f |
||
1508 | cmp al, '/' |
||
1509 | jnz @b |
||
91 | diamond | 1510 | lea ebp, [esi-1] |
1511 | jmp @b |
||
1512 | @@: |
||
83 | diamond | 1513 | pop esi |
91 | diamond | 1514 | test ebp, ebp |
1515 | jnz .noroot |
||
1516 | push ramdisk_root_extend_dir |
||
1517 | push ramdisk_root_next_write |
||
1518 | push ebp |
||
1519 | push ramdisk_root_first |
||
1520 | push ramdisk_root_next |
||
1521 | jmp .common1 |
||
1522 | .noroot: |
||
335 | diamond | 1523 | mov eax, ERROR_ACCESS_DENIED |
1524 | cmp byte [ebp+1], 0 |
||
1525 | jz .ret1 |
||
91 | diamond | 1526 | ; check existence |
1527 | mov byte [ebp], 0 |
||
1528 | call rd_find_lfn |
||
1529 | mov byte [ebp], '/' |
||
1530 | lea esi, [ebp+1] |
||
1531 | jnc @f |
||
1532 | mov eax, ERROR_FILE_NOT_FOUND |
||
1533 | .ret1: |
||
1534 | mov [esp+28], eax |
||
1535 | popad |
||
83 | diamond | 1536 | xor ebx, ebx |
1537 | ret |
||
1538 | @@: |
||
91 | diamond | 1539 | test byte [edi+11], 0x10 ; must be directory |
1540 | mov eax, ERROR_ACCESS_DENIED |
||
1541 | jz .ret1 |
||
1542 | movzx ebp, word [edi+26] ; ebp=cluster |
||
1543 | mov eax, ERROR_FAT_TABLE |
||
1544 | cmp ebp, 2 |
||
1545 | jb .ret1 |
||
1546 | cmp ebp, 2849 |
||
1547 | jae .ret1 |
||
1548 | push ramdisk_notroot_extend_dir |
||
1549 | push ramdisk_notroot_next_write |
||
1550 | push ebp |
||
1551 | push ramdisk_notroot_first |
||
1552 | push ramdisk_notroot_next |
||
1553 | .common1: |
||
1554 | call fat_find_lfn |
||
83 | diamond | 1555 | jc .notfound |
321 | diamond | 1556 | ; found |
91 | diamond | 1557 | test byte [edi+11], 10h |
321 | diamond | 1558 | jz .exists_file |
1559 | ; found directory; if we are creating directory, return OK, |
||
1560 | ; if we are creating file, say "access denied" |
||
1561 | add esp, 20 |
||
1562 | popad |
||
1563 | test al, al |
||
1564 | mov eax, ERROR_ACCESS_DENIED |
||
91 | diamond | 1565 | jz @f |
321 | diamond | 1566 | mov al, 0 |
1567 | @@: |
||
1568 | xor ebx, ebx |
||
1569 | ret |
||
1570 | .exists_file: |
||
1571 | ; found file; if we are creating directory, return "access denied", |
||
1572 | ; if we are creating file, delete existing file and continue |
||
1573 | cmp byte [esp+20+28], 0 |
||
1574 | jz @f |
||
91 | diamond | 1575 | add esp, 20 |
1576 | popad |
||
1577 | mov eax, ERROR_ACCESS_DENIED |
||
1578 | xor ebx, ebx |
||
1579 | ret |
||
1580 | @@: |
||
1581 | ; delete FAT chain |
||
83 | diamond | 1582 | push edi |
1583 | xor eax, eax |
||
1584 | mov dword [edi+28], eax ; zero size |
||
1585 | xchg ax, word [edi+26] ; start cluster |
||
1586 | test eax, eax |
||
1587 | jz .done1 |
||
1588 | @@: |
||
1589 | cmp eax, 0xFF8 |
||
1590 | jae .done1 |
||
321 | diamond | 1591 | lea edi, [RAMDISK_FAT + eax*2] ; position in FAT |
83 | diamond | 1592 | xor eax, eax |
1593 | xchg ax, [edi] |
||
1594 | jmp @b |
||
1595 | .done1: |
||
1596 | pop edi |
||
1597 | call get_time_for_file |
||
1598 | mov [edi+22], ax |
||
1599 | call get_date_for_file |
||
1600 | mov [edi+24], ax |
||
1601 | mov [edi+18], ax |
||
1602 | or byte [edi+11], 20h ; set 'archive' attribute |
||
1603 | jmp .doit |
||
1604 | .notfound: |
||
1605 | ; file is not found; generate short name |
||
1606 | call fat_name_is_legal |
||
1607 | jc @f |
||
91 | diamond | 1608 | add esp, 20 |
1609 | popad |
||
1610 | mov eax, ERROR_FILE_NOT_FOUND |
||
1611 | xor ebx, ebx |
||
1612 | ret |
||
83 | diamond | 1613 | @@: |
1614 | sub esp, 12 |
||
1615 | mov edi, esp |
||
1616 | call fat_gen_short_name |
||
1617 | .test_short_name_loop: |
||
91 | diamond | 1618 | push esi edi ecx |
1619 | mov esi, edi |
||
1620 | lea eax, [esp+12+12+8] |
||
1621 | mov [eax], ebp |
||
1622 | call dword [eax-4] |
||
1623 | jc .found |
||
83 | diamond | 1624 | .test_short_name_entry: |
91 | diamond | 1625 | cmp byte [edi+11], 0xF |
83 | diamond | 1626 | jz .test_short_name_cont |
1627 | mov ecx, 11 |
||
1628 | push esi edi |
||
1629 | repz cmpsb |
||
1630 | pop edi esi |
||
1631 | jz .short_name_found |
||
1632 | .test_short_name_cont: |
||
91 | diamond | 1633 | lea eax, [esp+12+12+8] |
1634 | call dword [eax-8] |
||
1635 | jnc .test_short_name_entry |
||
83 | diamond | 1636 | jmp .found |
1637 | .short_name_found: |
||
91 | diamond | 1638 | pop ecx edi esi |
83 | diamond | 1639 | call fat_next_short_name |
1640 | jnc .test_short_name_loop |
||
1641 | .disk_full: |
||
91 | diamond | 1642 | add esp, 12+20 |
1643 | popad |
||
83 | diamond | 1644 | mov eax, ERROR_DISK_FULL |
1645 | xor ebx, ebx |
||
1646 | ret |
||
1647 | .found: |
||
91 | diamond | 1648 | pop ecx edi esi |
83 | diamond | 1649 | ; now find space in directory |
1650 | ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' |
||
1651 | mov al, '~' |
||
1652 | push ecx edi |
||
1653 | mov ecx, 8 |
||
1654 | repnz scasb |
||
1655 | push 1 |
||
1656 | pop eax ; 1 entry |
||
1657 | jnz .notilde |
||
1658 | ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total |
||
1659 | xor eax, eax |
||
1660 | @@: |
||
1661 | cmp byte [esi], 0 |
||
1662 | jz @f |
||
1663 | inc esi |
||
1664 | inc eax |
||
1665 | jmp @b |
||
1666 | @@: |
||
1667 | sub esi, eax |
||
1668 | add eax, 12+13 |
||
1669 | mov ecx, 13 |
||
1670 | push edx |
||
1671 | cdq |
||
1672 | div ecx |
||
1673 | pop edx |
||
1674 | .notilde: |
||
91 | diamond | 1675 | push -1 |
1676 | push -1 |
||
83 | diamond | 1677 | ; find |
1678 | xor ecx, ecx |
||
91 | diamond | 1679 | push eax |
1680 | lea eax, [esp+12+8+12+8] |
||
1681 | mov [eax], ebp |
||
1682 | call dword [eax-4] |
||
1683 | pop eax |
||
83 | diamond | 1684 | .scan_dir: |
1685 | cmp byte [edi], 0 |
||
1686 | jz .free |
||
1687 | cmp byte [edi], 0xE5 |
||
1688 | jz .free |
||
1689 | xor ecx, ecx |
||
1690 | .scan_cont: |
||
91 | diamond | 1691 | push eax |
1692 | lea eax, [esp+12+8+12+8] |
||
1693 | call dword [eax-8] |
||
1694 | pop eax |
||
1695 | jnc .scan_dir |
||
1696 | push eax |
||
1697 | lea eax, [esp+12+8+12+8] |
||
1698 | call dword [eax+8] ; extend directory |
||
1699 | pop eax |
||
1700 | jnc .scan_dir |
||
1701 | add esp, 8+8+12+20 |
||
1702 | popad |
||
1703 | mov eax, ERROR_DISK_FULL |
||
1704 | xor ebx, ebx |
||
1705 | ret |
||
83 | diamond | 1706 | .free: |
91 | diamond | 1707 | test ecx, ecx |
1708 | jnz @f |
||
1709 | mov [esp], edi |
||
1710 | mov ecx, [esp+8+8+12+8] |
||
1711 | mov [esp+4], ecx |
||
1712 | xor ecx, ecx |
||
1713 | @@: |
||
83 | diamond | 1714 | inc ecx |
1715 | cmp ecx, eax |
||
1716 | jb .scan_cont |
||
1717 | ; found! |
||
1718 | ; calculate name checksum |
||
1719 | push esi ecx |
||
91 | diamond | 1720 | mov esi, [esp+8+8] |
83 | diamond | 1721 | mov ecx, 11 |
1722 | xor eax, eax |
||
1723 | @@: |
||
1724 | ror al, 1 |
||
1725 | add al, [esi] |
||
1726 | inc esi |
||
1727 | loop @b |
||
1728 | pop ecx esi |
||
91 | diamond | 1729 | pop edi |
1730 | pop dword [esp+8+12+8] |
||
83 | diamond | 1731 | ; edi points to last entry in free chunk |
1732 | dec ecx |
||
1733 | jz .nolfn |
||
1734 | push esi |
||
91 | diamond | 1735 | push eax |
1736 | mov al, 40h |
||
83 | diamond | 1737 | .writelfn: |
91 | diamond | 1738 | or al, cl |
1739 | mov esi, [esp+4] |
||
1740 | push ecx |
||
1741 | dec ecx |
||
1742 | imul ecx, 13 |
||
1743 | add esi, ecx |
||
83 | diamond | 1744 | stosb |
1745 | mov cl, 5 |
||
1746 | call .read_symbols |
||
1747 | mov ax, 0xF |
||
1748 | stosw |
||
91 | diamond | 1749 | mov al, [esp+4] |
83 | diamond | 1750 | stosb |
1751 | mov cl, 6 |
||
1752 | call .read_symbols |
||
1753 | xor eax, eax |
||
1754 | stosw |
||
1755 | mov cl, 2 |
||
1756 | call .read_symbols |
||
91 | diamond | 1757 | pop ecx |
1758 | lea eax, [esp+8+8+12+8] |
||
1759 | call dword [eax+4] ; next write |
||
1760 | xor eax, eax |
||
83 | diamond | 1761 | loop .writelfn |
91 | diamond | 1762 | pop eax |
83 | diamond | 1763 | pop esi |
1764 | .nolfn: |
||
1765 | xchg esi, [esp] |
||
1766 | mov ecx, 11 |
||
1767 | rep movsb |
||
1768 | mov word [edi], 20h ; attributes |
||
1769 | sub edi, 11 |
||
1770 | pop esi ecx |
||
1771 | add esp, 12 |
||
1772 | mov byte [edi+13], 0 ; tenths of a second at file creation time |
||
1773 | call get_time_for_file |
||
1774 | mov [edi+14], ax ; creation time |
||
1775 | mov [edi+22], ax ; last write time |
||
1776 | call get_date_for_file |
||
1777 | mov [edi+16], ax ; creation date |
||
1778 | mov [edi+24], ax ; last write date |
||
1779 | mov [edi+18], ax ; last access date |
||
1780 | and word [edi+20], 0 ; high word of cluster |
||
1781 | and word [edi+26], 0 ; low word of cluster - to be filled |
||
1782 | and dword [edi+28], 0 ; file size - to be filled |
||
321 | diamond | 1783 | cmp byte [esp+20+28], 0 |
1784 | jz .doit |
||
1785 | ; create directory |
||
1786 | mov byte [edi+11], 10h ; attributes: folder |
||
1787 | mov ecx, 32*2 |
||
1788 | mov edx, edi |
||
83 | diamond | 1789 | .doit: |
91 | diamond | 1790 | push edx |
83 | diamond | 1791 | push ecx |
1792 | push edi |
||
1793 | add edi, 26 ; edi points to low word of cluster |
||
1794 | push edi |
||
1795 | jecxz .done |
||
1796 | mov ecx, 2849 |
||
321 | diamond | 1797 | mov edi, RAMDISK_FAT |
83 | diamond | 1798 | .write_loop: |
1799 | ; allocate new cluster |
||
1800 | xor eax, eax |
||
1801 | repnz scasw |
||
1802 | jnz .disk_full2 |
||
1803 | dec edi |
||
1804 | dec edi |
||
321 | diamond | 1805 | lea eax, [edi-(RAMDISK_FAT)] |
83 | diamond | 1806 | shr eax, 1 ; eax = cluster |
1807 | mov word [edi], 0xFFF ; mark as last cluster |
||
1808 | xchg edi, [esp] |
||
1809 | stosw |
||
1810 | pop edi |
||
1811 | push edi |
||
1812 | inc ecx |
||
1813 | ; write data |
||
321 | diamond | 1814 | cmp byte [esp+16+20+28], 0 |
1815 | jnz .writedir |
||
83 | diamond | 1816 | shl eax, 9 |
321 | diamond | 1817 | add eax, RAMDISK+31*512 |
1818 | .writefile: |
||
83 | diamond | 1819 | mov ebx, edx |
1820 | xchg eax, ebx |
||
1821 | push ecx |
||
1822 | mov ecx, 512 |
||
1823 | cmp dword [esp+12], ecx |
||
1824 | jae @f |
||
1825 | mov ecx, [esp+12] |
||
1826 | @@: |
||
1827 | call memmove |
||
1828 | add edx, ecx |
||
1829 | sub [esp+12], ecx |
||
1830 | pop ecx |
||
1831 | jnz .write_loop |
||
1832 | .done: |
||
1833 | mov ebx, edx |
||
91 | diamond | 1834 | pop edi edi ecx edx |
83 | diamond | 1835 | sub ebx, edx |
1836 | mov [edi+28], ebx |
||
91 | diamond | 1837 | add esp, 20 |
131 | diamond | 1838 | mov [esp+16], ebx |
91 | diamond | 1839 | popad |
83 | diamond | 1840 | xor eax, eax |
1841 | ret |
||
1842 | .disk_full2: |
||
1843 | mov ebx, edx |
||
91 | diamond | 1844 | pop edi edi ecx edx |
83 | diamond | 1845 | sub ebx, edx |
1846 | mov [edi+28], ebx |
||
91 | diamond | 1847 | add esp, 20 |
131 | diamond | 1848 | mov [esp+16], ebx |
91 | diamond | 1849 | popad |
83 | diamond | 1850 | push ERROR_DISK_FULL |
1851 | pop eax |
||
1852 | ret |
||
321 | diamond | 1853 | .writedir: |
1854 | mov edi, eax |
||
1855 | shl edi, 9 |
||
1856 | add edi, RAMDISK+31*512 |
||
1857 | mov esi, edx |
||
1858 | mov ecx, 32/4 |
||
1859 | push ecx |
||
1860 | rep movsd |
||
1861 | mov dword [edi-32], '. ' |
||
1862 | mov dword [edi-32+4], ' ' |
||
1863 | mov dword [edi-32+8], ' ' |
||
1864 | mov byte [edi-32+11], 10h |
||
1865 | mov word [edi-32+26], ax |
||
1866 | mov esi, edx |
||
1867 | pop ecx |
||
1868 | rep movsd |
||
1869 | mov dword [edi-32], '.. ' |
||
1870 | mov dword [edi-32+4], ' ' |
||
1871 | mov dword [edi-32+8], ' ' |
||
1872 | mov byte [edi-32+11], 10h |
||
1873 | mov eax, [esp+16+8] |
||
1874 | mov word [edi-32+26], ax |
||
437 | diamond | 1875 | xor eax, eax |
1876 | mov ecx, (512-32*2)/4 |
||
1877 | rep stosd |
||
321 | diamond | 1878 | pop edi edi ecx edx |
1879 | add esp, 20 |
||
1880 | popad |
||
1881 | xor eax, eax |
||
1882 | xor ebx, ebx |
||
1883 | ret |
||
83 | diamond | 1884 | |
1885 | .read_symbol: |
||
1886 | or ax, -1 |
||
1887 | test esi, esi |
||
1888 | jz .retFFFF |
||
1889 | lodsb |
||
1890 | test al, al |
||
1891 | jnz ansi2uni_char |
||
1892 | xor eax, eax |
||
1893 | xor esi, esi |
||
1894 | .retFFFF: |
||
1895 | ret |
||
1896 | |||
1897 | .read_symbols: |
||
1898 | call .read_symbol |
||
1899 | stosw |
||
1900 | loop .read_symbols |
||
1901 | ret |
||
1902 | |||
131 | diamond | 1903 | ;---------------------------------------------------------------- |
1904 | ; |
||
1905 | ; fs_RamdiskWrite - LFN variant for writing to sys floppy |
||
1906 | ; |
||
1907 | ; esi points to filename |
||
1908 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
1909 | ; may be ebx=0 - start from first byte |
||
1910 | ; ecx number of bytes to write, 0+ |
||
1911 | ; edx mem location to data |
||
1912 | ; |
||
1913 | ; ret ebx = bytes written (maybe 0) |
||
1914 | ; eax = 0 ok write or other = errormsg |
||
1915 | ; |
||
1916 | ;-------------------------------------------------------------- |
||
1917 | @@: |
||
1918 | push ERROR_ACCESS_DENIED |
||
1919 | fs_RamdiskWrite.ret0: |
||
1920 | pop eax |
||
1921 | xor ebx, ebx |
||
1922 | ret |
||
1923 | |||
1924 | fs_RamdiskWrite: |
||
1925 | cmp byte [esi], 0 |
||
1926 | jz @b |
||
1927 | pushad |
||
1928 | call rd_find_lfn |
||
1929 | jnc .found |
||
1930 | popad |
||
1931 | push ERROR_FILE_NOT_FOUND |
||
1932 | jmp .ret0 |
||
1933 | .found: |
||
1934 | ; must not be directory |
||
1935 | test byte [edi+11], 10h |
||
1936 | jz @f |
||
1937 | popad |
||
1938 | push ERROR_ACCESS_DENIED |
||
1939 | jmp .ret0 |
||
1940 | @@: |
||
1941 | ; FAT does not support files larger than 4GB |
||
1942 | test ebx, ebx |
||
1943 | jz .l1 |
||
1944 | cmp dword [ebx+4], 0 |
||
1945 | jz @f |
||
1946 | .eof: |
||
1947 | popad |
||
1948 | push ERROR_END_OF_FILE |
||
1949 | jmp .ret0 |
||
1950 | @@: |
||
1951 | mov ebx, [ebx] |
||
1952 | .l1: |
||
1953 | ; now edi points to direntry, ebx=start byte to write, |
||
1954 | ; ecx=number of bytes to write, edx=data pointer |
||
133 | diamond | 1955 | call fat_update_datetime |
131 | diamond | 1956 | |
1957 | ; extend file if needed |
||
1958 | add ecx, ebx |
||
1959 | jc .eof ; FAT does not support files larger than 4GB |
||
1960 | push 0 ; return value=0 |
||
1961 | cmp ecx, [edi+28] |
||
1962 | jbe .length_ok |
||
1963 | cmp ecx, ebx |
||
1964 | jz .length_ok |
||
1965 | call ramdisk_extend_file |
||
1966 | jnc .length_ok |
||
1967 | ; ramdisk_extend_file can return two error codes: FAT table error or disk full. |
||
1968 | ; First case is fatal error, in second case we may write some data |
||
1969 | mov [esp], eax |
||
1970 | cmp al, ERROR_DISK_FULL |
||
1971 | jz .disk_full |
||
1972 | pop eax |
||
1973 | mov [esp+28], eax |
||
1974 | popad |
||
1975 | xor ebx, ebx |
||
1976 | ret |
||
1977 | .disk_full: |
||
1978 | ; correct number of bytes to write |
||
1979 | mov ecx, [edi+28] |
||
1980 | cmp ecx, ebx |
||
1981 | ja .length_ok |
||
1982 | .ret: |
||
1983 | pop eax |
||
1984 | mov [esp+28], eax ; eax=return value |
||
1985 | sub edx, [esp+20] |
||
1986 | mov [esp+16], edx ; ebx=number of written bytes |
||
1987 | popad |
||
1988 | ret |
||
1989 | .length_ok: |
||
1990 | ; now ebx=start pos, ecx=end pos, both lie inside file |
||
1991 | sub ecx, ebx |
||
1992 | jz .ret |
||
1993 | movzx edi, word [edi+26] ; starting cluster |
||
1994 | .write_loop: |
||
1995 | sub ebx, 0x200 |
||
1996 | jae .next_cluster |
||
1997 | push ecx |
||
1998 | neg ebx |
||
1999 | cmp ecx, ebx |
||
2000 | jbe @f |
||
2001 | mov ecx, ebx |
||
2002 | @@: |
||
2003 | mov eax, edi |
||
2004 | shl eax, 9 |
||
381 | serge | 2005 | add eax, RAMDISK+31*512+0x200 |
131 | diamond | 2006 | sub eax, ebx |
2007 | mov ebx, eax |
||
2008 | mov eax, edx |
||
2009 | call memmove |
||
2010 | xor ebx, ebx |
||
2011 | add edx, ecx |
||
2012 | sub [esp], ecx |
||
2013 | pop ecx |
||
2014 | jz .ret |
||
2015 | .next_cluster: |
||
381 | serge | 2016 | movzx edi, word [edi*2+RAMDISK_FAT] |
131 | diamond | 2017 | jmp .write_loop |
2018 | |||
2019 | ramdisk_extend_file.zero_size: |
||
2020 | xor eax, eax |
||
2021 | jmp ramdisk_extend_file.start_extend |
||
2022 | |||
2023 | ; extends file on ramdisk to given size, new data area is filled by 0 |
||
2024 | ; in: edi->direntry, ecx=new size |
||
133 | diamond | 2025 | ; out: CF=0 => OK, eax=0 |
131 | diamond | 2026 | ; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL) |
2027 | ramdisk_extend_file: |
||
2028 | push ecx |
||
2029 | ; find the last cluster of file |
||
2030 | movzx eax, word [edi+26] ; first cluster |
||
2031 | mov ecx, [edi+28] |
||
2032 | jecxz .zero_size |
||
2033 | @@: |
||
2034 | sub ecx, 0x200 |
||
2035 | jbe @f |
||
381 | serge | 2036 | mov eax, [eax*2+RAMDISK_FAT] |
131 | diamond | 2037 | and eax, 0xFFF |
2038 | jz .fat_err |
||
2039 | cmp eax, 0xFF8 |
||
2040 | jb @b |
||
2041 | .fat_err: |
||
2042 | pop ecx |
||
2043 | push ERROR_FAT_TABLE |
||
2044 | pop eax |
||
2045 | stc |
||
2046 | ret |
||
2047 | @@: |
||
2048 | push eax |
||
381 | serge | 2049 | mov eax, [eax*2+RAMDISK_FAT] |
131 | diamond | 2050 | and eax, 0xFFF |
2051 | cmp eax, 0xFF8 |
||
2052 | pop eax |
||
2053 | jb .fat_err |
||
2054 | ; set length to full number of sectors and make sure that last sector is zero-padded |
||
2055 | sub [edi+28], ecx |
||
2056 | push eax edi |
||
2057 | mov edi, eax |
||
2058 | shl edi, 9 |
||
381 | serge | 2059 | lea edi, [edi+RAMDISK+31*512+0x200+ecx] |
131 | diamond | 2060 | neg ecx |
2061 | xor eax, eax |
||
2062 | rep stosb |
||
2063 | pop edi eax |
||
2064 | .start_extend: |
||
2065 | pop ecx |
||
2066 | ; now do extend |
||
2067 | push edx esi |
||
381 | serge | 2068 | mov esi, RAMDISK_FAT+2*2 ; start scan from cluster 2 |
131 | diamond | 2069 | mov edx, 2847 ; number of clusters to scan |
2070 | .extend_loop: |
||
2071 | cmp [edi+28], ecx |
||
2072 | jae .extend_done |
||
2073 | ; add new sector |
||
2074 | push ecx |
||
2075 | mov ecx, edx |
||
2076 | push edi |
||
2077 | mov edi, esi |
||
2078 | jecxz .disk_full |
||
2079 | push eax |
||
2080 | xor eax, eax |
||
2081 | repnz scasw |
||
2082 | pop eax |
||
2083 | jnz .disk_full |
||
2084 | mov word [edi-2], 0xFFF |
||
2085 | mov esi, edi |
||
2086 | mov edx, ecx |
||
381 | serge | 2087 | sub edi, RAMDISK_FAT |
131 | diamond | 2088 | shr edi, 1 |
2089 | dec edi ; now edi=new cluster |
||
2090 | test eax, eax |
||
2091 | jz .first_cluster |
||
381 | serge | 2092 | mov [RAMDISK_FAT+eax*2], di |
131 | diamond | 2093 | jmp @f |
2094 | .first_cluster: |
||
2095 | pop eax ; eax->direntry |
||
2096 | push eax |
||
2097 | mov [eax+26], di |
||
2098 | @@: |
||
2099 | push edi |
||
2100 | shl edi, 9 |
||
381 | serge | 2101 | add edi, RAMDISK+31*512 |
131 | diamond | 2102 | xor eax, eax |
2103 | mov ecx, 512/4 |
||
2104 | rep stosd |
||
2105 | pop eax ; eax=new cluster |
||
2106 | pop edi ; edi->direntry |
||
2107 | pop ecx ; ecx=required size |
||
2108 | add dword [edi+28], 0x200 |
||
2109 | jmp .extend_loop |
||
2110 | .extend_done: |
||
2111 | mov [edi+28], ecx |
||
2112 | pop esi edx |
||
133 | diamond | 2113 | xor eax, eax ; CF=0 |
131 | diamond | 2114 | ret |
2115 | .disk_full: |
||
2116 | pop edi ecx |
||
2117 | pop esi edx |
||
2118 | stc |
||
2119 | push ERROR_DISK_FULL |
||
2120 | pop eax |
||
2121 | ret |
||
2122 | |||
133 | diamond | 2123 | fat_update_datetime: |
2124 | call get_time_for_file |
||
2125 | mov [edi+22], ax ; last write time |
||
2126 | call get_date_for_file |
||
2127 | mov [edi+24], ax ; last write date |
||
2128 | mov [edi+18], ax ; last access date |
||
2129 | ret |
||
2130 | |||
2131 | ;---------------------------------------------------------------- |
||
2132 | ; |
||
2133 | ; fs_RamdiskSetFileEnd - set end of file on ramdisk |
||
2134 | ; |
||
2135 | ; esi points to filename |
||
2136 | ; ebx points to 64-bit number = new file size |
||
2137 | ; ecx ignored (reserved) |
||
2138 | ; edx ignored (reserved) |
||
2139 | ; |
||
2140 | ; ret eax = 0 ok or other = errormsg |
||
2141 | ; |
||
2142 | ;-------------------------------------------------------------- |
||
2143 | fs_RamdiskSetFileEnd: |
||
2144 | cmp byte [esi], 0 |
||
2145 | jnz @f |
||
2146 | .access_denied: |
||
2147 | push ERROR_ACCESS_DENIED |
||
2148 | jmp .ret |
||
2149 | @@: |
||
2150 | push edi |
||
2151 | call rd_find_lfn |
||
2152 | jnc @f |
||
2153 | pop edi |
||
2154 | push ERROR_FILE_NOT_FOUND |
||
2155 | .ret: |
||
2156 | pop eax |
||
2157 | ret |
||
2158 | @@: |
||
2159 | ; must not be directory |
||
2160 | test byte [edi+11], 10h |
||
2161 | jz @f |
||
2162 | pop edi |
||
2163 | jmp .access_denied |
||
2164 | @@: |
||
2165 | ; file size must not exceed 4Gb |
||
2166 | cmp dword [ebx+4], 0 |
||
2167 | jz @f |
||
2168 | pop edi |
||
2169 | push ERROR_END_OF_FILE |
||
2170 | jmp .ret |
||
2171 | @@: |
||
2172 | ; set file modification date/time to current |
||
2173 | call fat_update_datetime |
||
2174 | mov eax, [ebx] |
||
2175 | cmp eax, [edi+28] |
||
2176 | jb .truncate |
||
2177 | ja .expand |
||
2178 | pop edi |
||
2179 | xor eax, eax |
||
2180 | ret |
||
2181 | .expand: |
||
2182 | push ecx |
||
2183 | mov ecx, eax |
||
2184 | call ramdisk_extend_file |
||
2185 | pop ecx |
||
2186 | pop edi |
||
2187 | ret |
||
2188 | .truncate: |
||
2189 | mov [edi+28], eax |
||
2190 | push ecx |
||
2191 | movzx ecx, word [edi+26] |
||
2192 | test eax, eax |
||
2193 | jz .zero_size |
||
2194 | ; find new last sector |
||
2195 | @@: |
||
2196 | sub eax, 0x200 |
||
2197 | jbe @f |
||
381 | serge | 2198 | movzx ecx, word [RAMDISK_FAT+ecx*2] |
133 | diamond | 2199 | jmp @b |
2200 | @@: |
||
2201 | ; zero data at the end of last sector |
||
2202 | push ecx |
||
2203 | mov edi, ecx |
||
2204 | shl edi, 9 |
||
381 | serge | 2205 | lea edi, [edi+RAMDISK+31*512+eax+0x200] |
133 | diamond | 2206 | mov ecx, eax |
2207 | neg ecx |
||
2208 | xor eax, eax |
||
2209 | rep stosb |
||
2210 | pop ecx |
||
2211 | ; terminate FAT chain |
||
381 | serge | 2212 | lea ecx, [RAMDISK_FAT+ecx+ecx] |
133 | diamond | 2213 | push dword [ecx] |
2214 | mov word [ecx], 0xFFF |
||
2215 | pop ecx |
||
2216 | and ecx, 0xFFF |
||
2217 | jmp .delete |
||
2218 | .zero_size: |
||
2219 | and word [edi+26], 0 |
||
2220 | .delete: |
||
2221 | ; delete FAT chain starting with ecx |
||
2222 | ; mark all clusters as free |
||
2223 | cmp ecx, 0xFF8 |
||
2224 | jae .deleted |
||
381 | serge | 2225 | lea ecx, [RAMDISK_FAT+ecx+ecx] |
133 | diamond | 2226 | push dword [ecx] |
2227 | and word [ecx], 0 |
||
2228 | pop ecx |
||
2229 | and ecx, 0xFFF |
||
2230 | jmp .delete |
||
2231 | .deleted: |
||
2232 | pop ecx |
||
2233 | pop edi |
||
2234 | xor eax, eax |
||
2235 | ret |
||
2236 | |||
86 | diamond | 2237 | fs_RamdiskGetFileInfo: |
2238 | cmp byte [esi], 0 |
||
2239 | jnz @f |
||
2240 | mov eax, 2 ; unsupported |
||
2241 | ret |
||
2242 | @@: |
||
2243 | push edi |
||
2244 | call rd_find_lfn |
||
2245 | fs_GetFileInfo_finish: |
||
2246 | jnc @f |
||
2247 | pop edi |
||
2248 | mov eax, ERROR_FILE_NOT_FOUND |
||
2249 | ret |
||
2250 | @@: |
||
2251 | push esi ebp |
||
2252 | xor ebp, ebp |
||
2253 | mov esi, edx |
||
2254 | and dword [esi+4], 0 |
||
2255 | call fat_entry_to_bdfe2 |
||
2256 | pop ebp esi |
||
2257 | pop edi |
||
2258 | xor eax, eax |
||
2259 | ret |
||
2260 | |||
2261 | fs_RamdiskSetFileInfo: |
||
2262 | cmp byte [esi], 0 |
||
2263 | jnz @f |
||
2264 | mov eax, 2 ; unsupported |
||
2265 | ret |
||
2266 | @@: |
||
2267 | push edi |
||
2268 | call rd_find_lfn |
||
2269 | jnc @f |
||
2270 | pop edi |
||
2271 | mov eax, ERROR_FILE_NOT_FOUND |
||
2272 | ret |
||
2273 | @@: |
||
2274 | call bdfe_to_fat_entry |
||
2275 | pop edi |
||
2276 | xor eax, eax |
||
2277 | ret |
||
2278 | |||
91 | diamond | 2279 | ;---------------------------------------------------------------- |
2280 | ; |
||
2281 | ; fs_RamdiskExecute - LFN variant for executing on sys floppy |
||
2282 | ; |
||
2283 | ; esi points to ramdisk filename (e.g. 'launcher') |
||
2284 | ; ebp points to full filename (e.g. '/rd/1/launcher') |
||
2285 | ; dword [ebx] = flags |
||
2286 | ; dword [ebx+4] = cmdline |
||
2287 | ; |
||
2288 | ; ret ebx,edx destroyed |
||
2289 | ; eax > 0 - PID, < 0 - error |
||
2290 | ; |
||
2291 | ;-------------------------------------------------------------- |
||
2292 | fs_RamdiskExecute: |
||
2293 | mov edx, [ebx] |
||
2294 | mov ebx, [ebx+4] |
||
2295 | test ebx, ebx |
||
2296 | jz @f |
||
2297 | add ebx, std_application_base_address |
||
2298 | @@: |
||
2299 | |||
2300 | ;---------------------------------------------------------------- |
||
2301 | ; |
||
2302 | ; fs_RamdiskExecute.flags - second entry |
||
2303 | ; |
||
2304 | ; esi points to ramdisk filename (kernel address) |
||
2305 | ; ebp points to full filename |
||
2306 | ; edx flags |
||
2307 | ; ebx cmdline (kernel address) |
||
2308 | ; |
||
2309 | ; ret eax > 0 - PID, < 0 - error |
||
2310 | ; |
||
2311 | ;-------------------------------------------------------------- |
||
2312 | |||
2313 | .flags: |
||
2314 | cmp byte [esi], 0 |
||
2315 | jnz @f |
||
2316 | ; cannot execute root! |
||
2317 | mov eax, -ERROR_ACCESS_DENIED |
||
2318 | ret |
||
2319 | @@: |
||
2320 | push edi |
||
2321 | call rd_find_lfn |
||
2322 | jnc .found |
||
2323 | pop edi |
||
2324 | mov eax, -ERROR_FILE_NOT_FOUND |
||
2325 | ret |
||
2326 | .found: |
||
2327 | movzx eax, word [edi+26] ; cluster |
||
2328 | push eax |
||
2329 | push dword [edi+28] ; size |
||
2330 | push .DoRead |
||
2331 | call fs_execute |
||
2332 | add esp, 12 |
||
2333 | pop edi |
||
2334 | ret |
||
2335 | |||
2336 | .DoRead: |
||
2337 | ; read next block |
||
2338 | ; in: eax->parameters, edi->buffer |
||
2339 | ; out: eax = error code |
||
2340 | pushad |
||
2341 | cmp dword [eax], 0 ; file size |
||
2342 | jz .eof |
||
2343 | mov edx, [eax+4] ; cluster |
||
2344 | lea esi, [edx+31] |
||
2345 | shl esi, 9 |
||
381 | serge | 2346 | add esi, RAMDISK |
91 | diamond | 2347 | mov ecx, 512/4 |
2348 | rep movsd |
||
2349 | mov ecx, [eax] |
||
2350 | sub ecx, 512 |
||
2351 | jae @f |
||
2352 | add edi, ecx |
||
2353 | neg ecx |
||
2354 | push eax |
||
2355 | xor eax, eax |
||
2356 | rep stosb |
||
2357 | pop eax |
||
2358 | @@: |
||
2359 | mov [eax], ecx |
||
381 | serge | 2360 | mov dx, [edx*2+RAMDISK_FAT] |
91 | diamond | 2361 | mov [eax+4], dx ; high word is already zero |
2362 | popad |
||
2363 | xor eax, eax |
||
2364 | ret |
||
2365 | .eof: |
||
2366 | popad |
||
2367 | mov eax, 6 |
||
2368 | ret |
||
2369 | |||
171 | diamond | 2370 | ;---------------------------------------------------------------- |
2371 | ; |
||
2372 | ; fs_RamdiskDelete - delete file or empty folder from ramdisk |
||
2373 | ; |
||
2374 | ; esi points to filename |
||
2375 | ; |
||
2376 | ; ret eax = 0 ok or other = errormsg |
||
2377 | ; |
||
2378 | ;-------------------------------------------------------------- |
||
2379 | fs_RamdiskDelete: |
||
2380 | cmp byte [esi], 0 |
||
2381 | jnz @f |
||
2382 | ; cannot delete root! |
||
2383 | .access_denied: |
||
2384 | push ERROR_ACCESS_DENIED |
||
2385 | .pop_ret: |
||
2386 | pop eax |
||
2387 | ret |
||
2388 | @@: |
||
2389 | and [rd_prev_sector], 0 |
||
2390 | and [rd_prev_prev_sector], 0 |
||
2391 | push edi |
||
2392 | call rd_find_lfn |
||
2393 | jnc .found |
||
2394 | pop edi |
||
2395 | push ERROR_FILE_NOT_FOUND |
||
2396 | jmp .pop_ret |
||
2397 | .found: |
||
2398 | cmp dword [edi], '. ' |
||
2399 | jz .access_denied2 |
||
2400 | cmp dword [edi], '.. ' |
||
2401 | jz .access_denied2 |
||
2402 | test byte [edi+11], 10h |
||
2403 | jz .dodel |
||
2404 | ; we can delete only empty folders! |
||
2405 | movzx eax, word [edi+26] |
||
2406 | push ebx |
||
2407 | mov ebx, eax |
||
2408 | shl ebx, 9 |
||
2409 | add ebx, RAMDISK + 31*0x200 + 2*0x20 |
||
2410 | .checkempty: |
||
2411 | cmp byte [ebx], 0 |
||
2412 | jz .empty |
||
2413 | cmp byte [ebx], 0xE5 |
||
2414 | jnz .notempty |
||
2415 | add ebx, 0x20 |
||
2416 | test ebx, 0x1FF |
||
2417 | jnz .checkempty |
||
2418 | movzx eax, word [RAMDISK_FAT + eax*2] |
||
2419 | test eax, eax |
||
2420 | jz .empty |
||
2421 | mov ebx, eax |
||
2422 | shl ebx, 9 |
||
2423 | add ebx, RAMDISK + 31*0x200 |
||
2424 | jmp .checkempty |
||
2425 | .notempty: |
||
2426 | pop ebx |
||
2427 | .access_denied2: |
||
2428 | pop edi |
||
2429 | jmp .access_denied |
||
2430 | .empty: |
||
2431 | pop ebx |
||
2432 | .dodel: |
||
2433 | movzx eax, word [edi+26] |
||
2434 | ; delete folder entry |
||
2435 | mov byte [edi], 0xE5 |
||
2436 | ; delete LFN (if present) |
||
2437 | .lfndel: |
||
2438 | test edi, 0x1FF |
||
2439 | jnz @f |
||
2440 | cmp [rd_prev_sector], 0 |
||
2441 | jz @f |
||
2442 | cmp [rd_prev_sector], -1 |
||
2443 | jz .lfndone |
||
2444 | mov edi, [rd_prev_sector] |
||
2445 | push [rd_prev_prev_sector] |
||
2446 | pop [rd_prev_sector] |
||
2447 | or [rd_prev_prev_sector], -1 |
||
2448 | shl edi, 9 |
||
2449 | add edi, RAMDISK + 31*0x200 + 0x200 |
||
2450 | @@: |
||
2451 | sub edi, 0x20 |
||
2452 | cmp byte [edi], 0xE5 |
||
2453 | jz .lfndone |
||
2454 | cmp byte [edi+11], 0xF |
||
2455 | jnz .lfndone |
||
2456 | mov byte [edi], 0xE5 |
||
2457 | jmp .lfndel |
||
2458 | .lfndone: |
||
2459 | ; delete FAT chain |
||
2460 | test eax, eax |
||
2461 | jz .done |
||
2462 | lea eax, [RAMDISK_FAT + eax*2] |
||
2463 | push dword [eax] |
||
2464 | and word [eax], 0 |
||
2465 | pop eax |
||
2466 | and eax, 0xFFF |
||
2467 | jmp .lfndone |
||
2468 | .done: |
||
2469 | pop edi |
||
2470 | xor eax, eax |
||
2471 | ret |
||
2472 | |||
78 | diamond | 2473 | ; \end{diamond}>>=>=>=>=>>->->-> |