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