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