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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 | |||
15 | mov esi,0x100000+512 |
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16 | mov edi,0x280000 |
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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 | |||
41 | cmp edi,0x280000+2856*2 ;2849 clusters |
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42 | jnz fcnew |
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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 | |||
52 | mov esi,0x280000 |
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53 | mov edi,0x100000+512 |
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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 | |||
69 | cmp edi,0x100000+512+4278 ;4274 bytes - all used FAT |
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70 | jb fcnew2 |
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71 | |||
72 | mov esi,0x100000+512 ; duplicate fat chain |
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73 | mov edi,0x100000+512+0x1200 |
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74 | mov ecx,1069 ;4274/4 |
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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 | |||
91 | mov edi,0x280000 ;start of FAT |
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92 | xor ax,ax ;Free cluster=0x0000 in FAT |
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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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105 | |||
106 | pop ecx ebx eax |
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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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196 | mov edx,ecx |
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197 | add edx,ebx |
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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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205 | mov esi,0x100000+512*19 |
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206 | add esi,ebx |
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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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249 | add eax,0x100000 ;image base |
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250 | mov ebx,[esp+8] |
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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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71 | diamond | 263 | movzx eax,word [edi*2+0x280000] ; 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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311 | |||
312 | call rd_findfile |
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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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329 | add edi,0x280000 |
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330 | movzx eax,word [edi] |
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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 | |||
342 | |||
343 | filesave: |
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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 | |||
378 | mov edi,0x100000+512*18+512 ;Point at directory |
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379 | mov edx,224 +1 |
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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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410 | mov edi,0x280000 ;pointer to first cluster |
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411 | mov ecx,2849 |
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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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426 | add ebx,0x100000 |
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427 | mov eax,[esp+32+16] |
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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 | |||
461 | mov edi,0x100000+512*18+512 ;Point at directory |
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462 | cld |
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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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470 | cmp edi,0x100000+512*33 |
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471 | jb rd_newsearch |
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472 | mov eax,5 ;if file not found - eax=5 |
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473 | xor ebx,ebx |
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474 | dec ebx ;ebx=0xffffffff and zf=0 |
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475 | rd_ff: |
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476 | ret |
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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 |
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83 | diamond | 591 | cmp byte [edi], 0 |
592 | jz .no |
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593 | cmp byte [edi], 0xE5 |
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594 | jnz @f |
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71 | diamond | 595 | .no: |
83 | diamond | 596 | stc |
597 | ret |
||
71 | diamond | 598 | @@: |
83 | diamond | 599 | cmp byte [edi+11], 0xF |
600 | jz .longname |
||
601 | push ecx |
||
602 | mov ecx, 8 |
||
603 | push edi ebp ecx |
||
78 | diamond | 604 | test byte [ebp-4], 1 |
75 | diamond | 605 | jnz .unicode_short |
71 | diamond | 606 | @@: |
83 | diamond | 607 | mov al, [edi] |
608 | inc edi |
||
609 | mov [ebp], al |
||
610 | inc ebp |
||
611 | loop @b |
||
612 | pop ecx |
||
71 | diamond | 613 | @@: |
83 | diamond | 614 | cmp byte [ebp-1], ' ' |
615 | jnz @f |
||
616 | dec ebp |
||
617 | loop @b |
||
71 | diamond | 618 | @@: |
83 | diamond | 619 | mov byte [ebp], '.' |
620 | inc ebp |
||
621 | mov ecx, 3 |
||
622 | push ecx |
||
71 | diamond | 623 | @@: |
83 | diamond | 624 | mov al, [edi] |
625 | inc edi |
||
626 | mov [ebp], al |
||
627 | inc ebp |
||
628 | loop @b |
||
629 | pop ecx |
||
71 | diamond | 630 | @@: |
83 | diamond | 631 | cmp byte [ebp-1], ' ' |
632 | jnz @f |
||
633 | dec ebp |
||
634 | loop @b |
||
635 | dec ebp |
||
71 | diamond | 636 | @@: |
83 | diamond | 637 | and byte [ebp], 0 ; CF=0 |
638 | pop ebp edi ecx |
||
639 | ret |
||
75 | diamond | 640 | .unicode_short: |
641 | @@: |
||
642 | mov al, [edi] |
||
643 | inc edi |
||
644 | call ansi2uni_char |
||
645 | mov [ebp], ax |
||
646 | inc ebp |
||
647 | inc ebp |
||
648 | loop @b |
||
649 | pop ecx |
||
650 | @@: |
||
83 | diamond | 651 | cmp word [ebp-2], ' ' |
652 | jnz @f |
||
653 | dec ebp |
||
654 | dec ebp |
||
655 | loop @b |
||
75 | diamond | 656 | @@: |
83 | diamond | 657 | mov word [ebp], '.' |
658 | inc ebp |
||
659 | inc ebp |
||
660 | mov ecx, 3 |
||
661 | push ecx |
||
75 | diamond | 662 | @@: |
83 | diamond | 663 | mov al, [edi] |
664 | inc edi |
||
665 | call ansi2uni_char |
||
666 | mov [ebp], ax |
||
75 | diamond | 667 | inc ebp |
668 | inc ebp |
||
669 | loop @b |
||
670 | pop ecx |
||
671 | @@: |
||
83 | diamond | 672 | cmp word [ebp-2], ' ' |
673 | jnz @f |
||
674 | dec ebp |
||
675 | dec ebp |
||
676 | loop @b |
||
677 | dec ebp |
||
678 | dec ebp |
||
75 | diamond | 679 | @@: |
83 | diamond | 680 | and word [ebp], 0 ; CF=0 |
681 | pop ebp edi ecx |
||
682 | ret |
||
71 | diamond | 683 | .longname: |
684 | ; LFN |
||
83 | diamond | 685 | mov al, byte [edi] |
686 | and eax, 0x3F |
||
687 | dec eax |
||
688 | cmp al, 20 |
||
689 | jae .no ; ignore invalid entries |
||
690 | mov word [ebp+260*2], 0 ; force null-terminating for orphans |
||
691 | imul eax, 13*2 |
||
692 | add ebp, eax |
||
693 | test byte [edi], 0x40 |
||
694 | jz @f |
||
695 | mov word [ebp+13*2], 0 |
||
71 | diamond | 696 | @@: |
83 | diamond | 697 | push eax |
71 | diamond | 698 | ; now copy name from edi to ebp ... |
83 | diamond | 699 | mov eax, [edi+1] |
700 | mov [ebp], eax ; symbols 1,2 |
||
701 | mov eax, [edi+5] |
||
702 | mov [ebp+4], eax ; 3,4 |
||
703 | mov eax, [edi+9] |
||
704 | mov [ebp+8], ax ; 5 |
||
705 | mov eax, [edi+14] |
||
706 | mov [ebp+10], eax ; 6,7 |
||
707 | mov eax, [edi+18] |
||
708 | mov [ebp+14], eax ; 8,9 |
||
709 | mov eax, [edi+22] |
||
710 | mov [ebp+18], eax ; 10,11 |
||
711 | mov eax, [edi+28] |
||
712 | mov [ebp+22], eax ; 12,13 |
||
71 | diamond | 713 | ; ... done |
83 | diamond | 714 | pop eax |
715 | sub ebp, eax |
||
716 | test eax, eax |
||
717 | jz @f |
||
71 | diamond | 718 | ; if this is not first entry, more processing required |
83 | diamond | 719 | stc |
720 | ret |
||
71 | diamond | 721 | @@: |
722 | ; if this is first entry: |
||
78 | diamond | 723 | test byte [ebp-4], 1 |
75 | diamond | 724 | jnz .ret |
71 | diamond | 725 | ; buffer at ebp contains UNICODE name, convert it to ANSI |
83 | diamond | 726 | push esi edi |
727 | mov esi, ebp |
||
728 | mov edi, ebp |
||
729 | call uni2ansi_str |
||
730 | pop edi esi |
||
75 | diamond | 731 | .ret: |
83 | diamond | 732 | clc |
733 | ret |
||
71 | diamond | 734 | |
735 | fat_compare_name: |
||
736 | ; compares ASCIIZ-names, case-insensitive (cp866 encoding) |
||
737 | ; in: esi->name, ebp->name |
||
738 | ; out: if names match: ZF=1 and esi->next component of name |
||
739 | ; else: ZF=0, esi is not changed |
||
740 | ; destroys eax |
||
83 | diamond | 741 | push ebp esi |
71 | diamond | 742 | .loop: |
83 | diamond | 743 | mov al, [ebp] |
744 | inc ebp |
||
745 | call char_toupper |
||
746 | push eax |
||
747 | lodsb |
||
748 | call char_toupper |
||
749 | cmp al, [esp] |
||
750 | jnz .done |
||
751 | pop eax |
||
752 | test al, al |
||
753 | jnz .loop |
||
754 | dec esi |
||
755 | pop eax |
||
756 | pop ebp |
||
757 | xor eax, eax ; set ZF flag |
||
758 | ret |
||
71 | diamond | 759 | .done: |
83 | diamond | 760 | cmp al, '/' |
761 | jnz @f |
||
762 | cmp byte [esp], 0 |
||
763 | jnz @f |
||
764 | mov [esp+4], esi |
||
71 | diamond | 765 | @@: |
83 | diamond | 766 | pop eax |
767 | pop esi ebp |
||
768 | ret |
||
71 | diamond | 769 | |
75 | diamond | 770 | fat_time_to_bdfe: |
771 | ; in: eax=FAT time |
||
772 | ; out: eax=BDFE time |
||
83 | diamond | 773 | push ecx edx |
774 | mov ecx, eax |
||
775 | mov edx, eax |
||
776 | shr eax, 11 |
||
777 | shl eax, 16 ; hours |
||
778 | and edx, 0x1F |
||
779 | add edx, edx |
||
780 | mov al, dl ; seconds |
||
781 | shr ecx, 5 |
||
782 | and ecx, 0x3F |
||
783 | mov ah, cl ; minutes |
||
784 | pop edx ecx |
||
785 | ret |
||
75 | diamond | 786 | |
787 | fat_date_to_bdfe: |
||
83 | diamond | 788 | push ecx edx |
789 | mov ecx, eax |
||
790 | mov edx, eax |
||
791 | shr eax, 9 |
||
792 | add ax, 1980 |
||
793 | shl eax, 16 ; year |
||
794 | and edx, 0x1F |
||
795 | mov al, dl ; day |
||
796 | shr ecx, 5 |
||
797 | and ecx, 0xF |
||
798 | mov ah, cl ; month |
||
799 | pop edx ecx |
||
800 | ret |
||
75 | diamond | 801 | |
86 | diamond | 802 | bdfe_to_fat_time: |
803 | push edx |
||
804 | mov edx, eax |
||
805 | shr eax, 16 |
||
806 | and dh, 0x3F |
||
807 | shl eax, 6 |
||
808 | or al, dh |
||
809 | shr dl, 1 |
||
810 | and dl, 0x1F |
||
811 | shl eax, 5 |
||
812 | or al, dl |
||
813 | pop edx |
||
814 | ret |
||
815 | |||
816 | bdfe_to_fat_date: |
||
817 | push edx |
||
818 | mov edx, eax |
||
819 | shr eax, 16 |
||
820 | sub ax, 1980 |
||
821 | and dh, 0xF |
||
822 | shl eax, 4 |
||
823 | or al, dh |
||
824 | and dl, 0x1F |
||
825 | shl eax, 5 |
||
826 | or al, dl |
||
827 | pop edx |
||
828 | ret |
||
829 | |||
75 | diamond | 830 | fat_entry_to_bdfe: |
831 | ; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi |
||
832 | ; destroys eax |
||
86 | diamond | 833 | mov eax, [ebp-4] |
834 | mov [esi+4], eax ; ASCII/UNICODE name |
||
835 | fat_entry_to_bdfe2: |
||
75 | diamond | 836 | movzx eax, byte [edi+11] |
837 | mov [esi], eax ; attributes |
||
838 | movzx eax, word [edi+14] |
||
839 | call fat_time_to_bdfe |
||
840 | mov [esi+8], eax ; creation time |
||
841 | movzx eax, word [edi+16] |
||
842 | call fat_date_to_bdfe |
||
843 | mov [esi+12], eax ; creation date |
||
844 | and dword [esi+16], 0 ; last access time is not supported on FAT |
||
845 | movzx eax, word [edi+18] |
||
846 | call fat_date_to_bdfe |
||
847 | mov [esi+20], eax ; last access date |
||
848 | movzx eax, word [edi+22] |
||
849 | call fat_time_to_bdfe |
||
850 | mov [esi+24], eax ; last write time |
||
851 | movzx eax, word [edi+24] |
||
852 | call fat_date_to_bdfe |
||
853 | mov [esi+28], eax ; last write date |
||
854 | mov eax, [edi+28] |
||
855 | mov [esi+32], eax ; file size (low dword) |
||
856 | xor eax, eax |
||
857 | mov [esi+36], eax ; file size (high dword) |
||
86 | diamond | 858 | test ebp, ebp |
859 | jz .ret |
||
75 | diamond | 860 | push ecx edi |
861 | lea edi, [esi+40] |
||
862 | mov esi, ebp |
||
78 | diamond | 863 | test byte [esi-4], 1 |
864 | jz .ansi |
||
865 | mov ecx, 260/2 |
||
75 | diamond | 866 | rep movsd |
78 | diamond | 867 | mov [edi-2], ax |
868 | @@: |
||
75 | diamond | 869 | mov esi, edi |
870 | pop edi ecx |
||
86 | diamond | 871 | .ret: |
75 | diamond | 872 | ret |
78 | diamond | 873 | .ansi: |
874 | mov ecx, 264/4 |
||
875 | rep movsd |
||
876 | mov [edi-1], al |
||
877 | jmp @b |
||
75 | diamond | 878 | |
86 | diamond | 879 | bdfe_to_fat_entry: |
880 | ; convert BDFE at edx to FAT entry at edi |
||
881 | ; destroys eax |
||
882 | ; attributes byte |
||
883 | test byte [edi+11], 8 ; volume label? |
||
884 | jnz @f |
||
885 | mov al, [edx] |
||
886 | and al, 0x27 |
||
887 | and byte [edi+11], 0x10 |
||
888 | or byte [edi+11], al |
||
889 | @@: |
||
890 | mov eax, [edx+8] |
||
891 | call bdfe_to_fat_time |
||
892 | mov [edi+14], ax ; creation time |
||
893 | mov eax, [edx+12] |
||
894 | call bdfe_to_fat_date |
||
895 | mov [edi+16], ax ; creation date |
||
896 | mov eax, [edx+20] |
||
897 | call bdfe_to_fat_date |
||
898 | mov [edi+18], ax ; last access date |
||
899 | mov eax, [edx+24] |
||
900 | call bdfe_to_fat_time |
||
901 | mov [edi+22], ax ; last write time |
||
902 | mov eax, [edx+28] |
||
903 | call bdfe_to_fat_date |
||
904 | mov [edi+24], ax ; last write date |
||
905 | ret |
||
906 | |||
907 | ramdisk_root_first: |
||
908 | mov edi, 0x100000+512*19 |
||
909 | clc |
||
910 | ret |
||
911 | ramdisk_root_next: |
||
912 | add edi, 0x20 |
||
913 | cmp edi, 0x100000+512*33 |
||
914 | cmc |
||
915 | ret |
||
916 | |||
91 | diamond | 917 | ramdisk_root_extend_dir: |
918 | stc |
||
919 | ret |
||
920 | |||
921 | ramdisk_notroot_next: |
||
922 | add edi, 0x20 |
||
923 | test edi, 0x1FF |
||
924 | jz ramdisk_notroot_next_sector |
||
925 | ret ; CF=0 |
||
926 | ramdisk_notroot_next_sector: |
||
927 | push ecx |
||
928 | mov ecx, [eax] |
||
929 | mov ecx, [ecx*2+0x280000] |
||
930 | and ecx, 0xFFF |
||
931 | cmp ecx, 2849 |
||
932 | jae ramdisk_notroot_first.err2 |
||
933 | mov [eax], ecx |
||
934 | pop ecx |
||
935 | ramdisk_notroot_first: |
||
936 | mov eax, [eax] |
||
937 | cmp eax, 2 |
||
938 | jb .err |
||
939 | cmp eax, 2849 |
||
940 | jae .err |
||
941 | shl eax, 9 |
||
942 | lea edi, [eax+(31 shl 9)+0x100000] |
||
943 | clc |
||
944 | ret |
||
945 | .err2: |
||
946 | pop ecx |
||
947 | .err: |
||
948 | stc |
||
949 | ret |
||
950 | ramdisk_notroot_next_write: |
||
951 | test edi, 0x1FF |
||
952 | jz ramdisk_notroot_next_sector |
||
953 | ramdisk_root_next_write: |
||
954 | ret |
||
955 | |||
956 | ramdisk_notroot_extend_dir: |
||
957 | pusha |
||
958 | xor eax, eax |
||
959 | mov edi, 0x280000 |
||
960 | mov ecx, 2849 |
||
961 | repnz scasw |
||
962 | jnz .notfound |
||
963 | mov word [edi-2], 0xFFF |
||
964 | sub edi, 0x280000 |
||
965 | shr edi, 1 |
||
966 | dec edi |
||
967 | mov eax, [esp+28] |
||
968 | mov ecx, [eax] |
||
969 | mov [0x280000+ecx*2], di |
||
970 | mov [eax], edi |
||
971 | shl edi, 9 |
||
972 | add edi, (31 shl 9)+0x100000 |
||
973 | mov [esp], edi |
||
974 | xor eax, eax |
||
975 | mov ecx, 128 |
||
976 | rep stosd |
||
977 | popa |
||
978 | clc |
||
979 | ret |
||
980 | .notfound: |
||
981 | popa |
||
982 | stc |
||
983 | ret |
||
984 | |||
71 | diamond | 985 | rd_find_lfn: |
986 | ; in: esi->name |
||
987 | ; out: CF=1 - file not found |
||
988 | ; else CF=0 and edi->direntry |
||
86 | diamond | 989 | push esi edi |
91 | diamond | 990 | push 0 |
86 | diamond | 991 | push ramdisk_root_first |
992 | push ramdisk_root_next |
||
91 | diamond | 993 | .loop: |
86 | diamond | 994 | call fat_find_lfn |
995 | jc .notfound |
||
996 | cmp byte [esi], 0 |
||
91 | diamond | 997 | jz .found |
998 | test byte [edi+11], 10h |
||
999 | jz .notfound |
||
1000 | movzx eax, word [edi+26] |
||
1001 | mov [esp+8], eax |
||
1002 | mov dword [esp+4], ramdisk_notroot_first |
||
1003 | mov dword [esp], ramdisk_notroot_next |
||
1004 | jmp .loop |
||
1005 | .notfound: |
||
86 | diamond | 1006 | add esp, 12 |
1007 | pop edi esi |
||
78 | diamond | 1008 | stc |
1009 | ret |
||
91 | diamond | 1010 | .found: |
1011 | mov eax, [esp+8] |
||
1012 | add esp, 16 ; CF=0 |
||
1013 | pop esi |
||
1014 | ret |
||
71 | diamond | 1015 | |
1016 | ;---------------------------------------------------------------- |
||
1017 | ; |
||
1018 | ; fs_RamdiskRead - LFN variant for reading sys floppy |
||
1019 | ; |
||
1020 | ; esi points to filename |
||
1021 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
1022 | ; may be ebx=0 - start from first byte |
||
1023 | ; ecx number of bytes to read, 0+ |
||
1024 | ; edx mem location to return data |
||
1025 | ; |
||
77 | diamond | 1026 | ; ret ebx = bytes read or 0xffffffff file not found |
71 | diamond | 1027 | ; eax = 0 ok read or other = errormsg |
1028 | ; |
||
1029 | ;-------------------------------------------------------------- |
||
1030 | fs_RamdiskRead: |
||
75 | diamond | 1031 | cmp byte [esi], 0 |
1032 | jnz @f |
||
1033 | or ebx, -1 |
||
1034 | mov eax, 10 ; access denied |
||
1035 | ret |
||
71 | diamond | 1036 | @@: |
75 | diamond | 1037 | push edi |
1038 | call rd_find_lfn |
||
1039 | jnc .found |
||
1040 | pop edi |
||
1041 | or ebx, -1 |
||
1042 | mov eax, 5 ; file not found |
||
1043 | ret |
||
71 | diamond | 1044 | .found: |
75 | diamond | 1045 | test ebx, ebx |
1046 | jz .l1 |
||
1047 | cmp dword [ebx+4], 0 |
||
1048 | jz @f |
||
77 | diamond | 1049 | xor ebx, ebx |
71 | diamond | 1050 | .reteof: |
75 | diamond | 1051 | mov eax, 6 ; EOF |
1052 | pop edi |
||
1053 | ret |
||
71 | diamond | 1054 | @@: |
75 | diamond | 1055 | mov ebx, [ebx] |
71 | diamond | 1056 | .l1: |
77 | diamond | 1057 | push ecx edx |
1058 | push 0 |
||
1059 | mov eax, [edi+28] |
||
1060 | sub eax, ebx |
||
1061 | jb .eof |
||
1062 | cmp eax, ecx |
||
1063 | jae @f |
||
1064 | mov ecx, eax |
||
1065 | mov byte [esp], 6 ; EOF |
||
1066 | @@: |
||
75 | diamond | 1067 | movzx edi, word [edi+26] ; cluster |
71 | diamond | 1068 | .new: |
75 | diamond | 1069 | jecxz .done |
1070 | test edi, edi |
||
1071 | jz .eof |
||
1072 | cmp edi, 0xFF8 |
||
1073 | jae .eof |
||
1074 | lea eax, [edi+31] ; bootsector+2*fat+filenames |
||
1075 | shl eax, 9 ; *512 |
||
1076 | add eax, 0x100000 ; image base |
||
71 | diamond | 1077 | ; now eax points to data of cluster |
75 | diamond | 1078 | sub ebx, 512 |
1079 | jae .skip |
||
1080 | lea eax, [eax+ebx+512] |
||
1081 | neg ebx |
||
1082 | push ecx |
||
1083 | cmp ecx, ebx |
||
1084 | jbe @f |
||
1085 | mov ecx, ebx |
||
71 | diamond | 1086 | @@: |
75 | diamond | 1087 | mov ebx, edx |
1088 | call memmove |
||
1089 | add edx, ecx |
||
1090 | sub [esp], ecx |
||
1091 | pop ecx |
||
1092 | xor ebx, ebx |
||
71 | diamond | 1093 | .skip: |
75 | diamond | 1094 | movzx edi, word [edi*2+0x280000] ; find next cluster from FAT |
1095 | jmp .new |
||
71 | diamond | 1096 | .eof: |
77 | diamond | 1097 | mov ebx, edx |
1098 | pop eax edx ecx |
||
1099 | sub ebx, edx |
||
75 | diamond | 1100 | jmp .reteof |
71 | diamond | 1101 | .done: |
77 | diamond | 1102 | mov ebx, edx |
1103 | pop eax edx ecx edi |
||
1104 | sub ebx, edx |
||
75 | diamond | 1105 | ret |
71 | diamond | 1106 | |
75 | diamond | 1107 | ;---------------------------------------------------------------- |
1108 | ; |
||
1109 | ; fs_RamdiskReadFolder - LFN variant for reading sys floppy folder |
||
1110 | ; |
||
1111 | ; esi points to filename; only root is folder on ramdisk |
||
78 | diamond | 1112 | ; ebx pointer to structure 32-bit number = first wanted block |
1113 | ; & flags (bitfields) |
||
1114 | ; flags: bit 0: 0=ANSI names, 1=UNICODE names |
||
75 | diamond | 1115 | ; ecx number of blocks to read, 0+ |
1116 | ; edx mem location to return data |
||
1117 | ; |
||
1118 | ; ret ebx = size or 0xffffffff file not found |
||
1119 | ; eax = 0 ok read or other = errormsg |
||
1120 | ; |
||
1121 | ;-------------------------------------------------------------- |
||
1122 | fs_RamdiskReadFolder: |
||
91 | diamond | 1123 | push edi |
75 | diamond | 1124 | cmp byte [esi], 0 |
91 | diamond | 1125 | jz .root |
1126 | call rd_find_lfn |
||
1127 | jnc .found |
||
1128 | pop edi |
||
75 | diamond | 1129 | or ebx, -1 |
91 | diamond | 1130 | mov eax, ERROR_FILE_NOT_FOUND |
75 | diamond | 1131 | ret |
91 | diamond | 1132 | .found: |
1133 | test byte [edi+11], 0x10 |
||
1134 | jnz .found_dir |
||
1135 | pop edi |
||
1136 | or ebx, -1 |
||
1137 | mov eax, ERROR_ACCESS_DENIED |
||
1138 | ret |
||
1139 | .found_dir: |
||
1140 | movzx eax, word [edi+26] |
||
1141 | add eax, 31 |
||
1142 | push 0 |
||
1143 | jmp .doit |
||
1144 | .root: |
||
1145 | mov eax, 19 |
||
1146 | push 14 |
||
1147 | .doit: |
||
1148 | push esi ecx ebp |
||
1149 | sub esp, 262*2 ; reserve space for LFN |
||
1150 | mov ebp, esp |
||
1151 | push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names |
||
1152 | mov ebx, [ebx] |
||
75 | diamond | 1153 | ; init header |
91 | diamond | 1154 | push eax ecx |
75 | diamond | 1155 | mov edi, edx |
1156 | mov ecx, 32/4 |
||
1157 | xor eax, eax |
||
1158 | rep stosd |
||
1159 | mov byte [edx], 1 ; version |
||
91 | diamond | 1160 | pop ecx eax |
75 | diamond | 1161 | mov esi, edi ; esi points to block of data of folder entry (BDFE) |
91 | diamond | 1162 | .main_loop: |
1163 | mov edi, eax |
||
1164 | shl edi, 9 |
||
1165 | add edi, 0x100000 |
||
1166 | push eax |
||
75 | diamond | 1167 | .l1: |
1168 | call fat_get_name |
||
1169 | jc .l2 |
||
1170 | cmp byte [edi+11], 0xF |
||
91 | diamond | 1171 | jnz .do_bdfe |
75 | diamond | 1172 | add edi, 0x20 |
91 | diamond | 1173 | test edi, 0x1FF |
1174 | jnz .do_bdfe |
||
1175 | pop eax |
||
1176 | inc eax |
||
1177 | dec byte [esp+262*2+16] |
||
1178 | jz .done |
||
1179 | jns @f |
||
1180 | ; read next sector from FAT |
||
1181 | mov eax, [(eax-31-1)*2+0x280000] |
||
1182 | and eax, 0xFFF |
||
1183 | cmp eax, 0xFF8 |
||
1184 | jae .done |
||
1185 | add eax, 31 |
||
1186 | mov byte [esp+262*2+16], 0 |
||
75 | diamond | 1187 | @@: |
91 | diamond | 1188 | mov edi, eax |
1189 | shl edi, 9 |
||
1190 | add edi, 0x100000 |
||
1191 | push eax |
||
1192 | .do_bdfe: |
||
75 | diamond | 1193 | inc dword [edx+8] ; new file found |
1194 | dec ebx |
||
1195 | jns .l2 |
||
1196 | dec ecx |
||
1197 | js .l2 |
||
1198 | inc dword [edx+4] ; new file block copied |
||
1199 | call fat_entry_to_bdfe |
||
1200 | .l2: |
||
1201 | add edi, 0x20 |
||
91 | diamond | 1202 | test edi, 0x1FF |
1203 | jnz .l1 |
||
1204 | pop eax |
||
1205 | inc eax |
||
1206 | dec byte [esp+262*2+16] |
||
1207 | jz .done |
||
1208 | jns @f |
||
1209 | ; read next sector from FAT |
||
1210 | mov eax, [(eax-31-1)*2+0x280000] |
||
1211 | and eax, 0xFFF |
||
1212 | cmp eax, 0xFF8 |
||
1213 | jae .done |
||
1214 | add eax, 31 |
||
1215 | mov byte [esp+262*2+16], 0 |
||
1216 | @@: |
||
1217 | jmp .main_loop |
||
1218 | .done: |
||
75 | diamond | 1219 | add esp, 262*2+4 |
1220 | pop ebp |
||
77 | diamond | 1221 | mov ebx, [edx+4] |
75 | diamond | 1222 | xor eax, eax |
1223 | dec ecx |
||
1224 | js @f |
||
1225 | mov al, ERROR_END_OF_FILE |
||
1226 | @@: |
||
91 | diamond | 1227 | pop ecx esi edi edi |
75 | diamond | 1228 | ret |
1229 | |||
83 | diamond | 1230 | iglobal |
1231 | label fat_legal_chars byte |
||
1232 | ; 0 = not allowed |
||
1233 | ; 1 = allowed only in long names |
||
1234 | ; 3 = allowed |
||
1235 | times 32 db 0 |
||
1236 | ; ! " # $ % & ' ( ) * + , - . / |
||
1237 | db 1,3,0,3,3,3,3,3,3,3,0,1,1,3,3,0 |
||
1238 | ; 0 1 2 3 4 5 6 7 8 9 : ; < = > ? |
||
1239 | db 3,3,3,3,3,3,3,3,3,3,0,1,0,1,0,0 |
||
1240 | ; @ A B C D E F G H I J K L M N O |
||
1241 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
1242 | ; P Q R S T U V W X Y Z [ \ ] ^ _ |
||
1243 | db 3,3,3,3,3,3,3,3,3,3,3,1,0,1,3,3 |
||
1244 | ; ` a b c d e f g h i j k l m n o |
||
1245 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
||
1246 | ; p q r s t u v w x y z { | } ~ |
||
1247 | db 3,3,3,3,3,3,3,3,3,3,3,3,0,3,3,0 |
||
1248 | endg |
||
1249 | |||
1250 | fat_name_is_legal: |
||
1251 | ; in: esi->(long) name |
||
1252 | ; out: CF set <=> legal |
||
1253 | ; destroys eax |
||
1254 | push esi |
||
1255 | xor eax, eax |
||
1256 | @@: |
||
1257 | lodsb |
||
1258 | test al, al |
||
1259 | jz .done |
||
1260 | cmp al, 80h |
||
1261 | jae .big |
||
1262 | test [fat_legal_chars+eax], 1 |
||
1263 | jnz @b |
||
1264 | .err: |
||
1265 | pop esi |
||
1266 | clc |
||
1267 | ret |
||
1268 | .big: |
||
1269 | ; 0x80-0xAF, 0xE0-0xEF |
||
1270 | cmp al, 0xB0 |
||
1271 | jb @b |
||
1272 | cmp al, 0xE0 |
||
1273 | jb .err |
||
1274 | cmp al, 0xF0 |
||
1275 | jb @b |
||
1276 | jmp .err |
||
1277 | .done: |
||
1278 | sub esi, [esp] |
||
1279 | cmp esi, 257 |
||
1280 | pop esi |
||
1281 | ret |
||
1282 | |||
1283 | fat_next_short_name: |
||
1284 | ; in: edi->8+3 name |
||
1285 | ; out: name corrected |
||
1286 | ; CF=1 <=> error |
||
1287 | pushad |
||
1288 | mov ecx, 8 |
||
1289 | mov al, '~' |
||
1290 | std |
||
1291 | push edi |
||
1292 | add edi, 7 |
||
1293 | repnz scasb |
||
1294 | pop edi |
||
1295 | cld |
||
1296 | jz .tilde |
||
1297 | ; tilde is not found, insert "~1" at end |
||
1298 | add edi, 6 |
||
1299 | cmp word [edi], ' ' |
||
1300 | jnz .insert_tilde |
||
1301 | @@: dec edi |
||
1302 | cmp byte [edi], ' ' |
||
1303 | jz @b |
||
1304 | inc edi |
||
1305 | .insert_tilde: |
||
1306 | mov word [edi], '~1' |
||
1307 | popad |
||
1308 | ; clc ; CF already cleared |
||
1309 | ret |
||
1310 | .tilde: |
||
1311 | push edi |
||
1312 | add edi, 7 |
||
1313 | xor ecx, ecx |
||
1314 | @@: |
||
1315 | ; after tilde may be only digits and trailing spaces |
||
1316 | cmp byte [edi], '~' |
||
1317 | jz .break |
||
1318 | cmp byte [edi], ' ' |
||
1319 | jz .space |
||
1320 | cmp byte [edi], '9' |
||
1321 | jnz .found |
||
1322 | dec edi |
||
1323 | jmp @b |
||
1324 | .space: |
||
1325 | dec edi |
||
1326 | inc ecx |
||
1327 | jmp @b |
||
1328 | .found: |
||
1329 | inc byte [edi] |
||
1330 | .succ: |
||
1331 | pop edi |
||
1332 | popad |
||
1333 | clc |
||
1334 | ret |
||
1335 | .break: |
||
1336 | jecxz .noplace |
||
1337 | inc edi |
||
1338 | mov al, '1' |
||
1339 | @@: |
||
1340 | xchg al, [edi] |
||
1341 | inc edi |
||
1342 | cmp al, ' ' |
||
1343 | mov al, '0' |
||
1344 | jnz @b |
||
1345 | jmp .succ |
||
1346 | .noplace: |
||
1347 | dec edi |
||
1348 | cmp edi, [esp] |
||
1349 | jz .err |
||
1350 | add dword [esp], 8 |
||
1351 | mov word [edi], '~1' |
||
1352 | inc edi |
||
1353 | inc edi |
||
1354 | @@: |
||
1355 | mov byte [edi], '0' |
||
1356 | inc edi |
||
1357 | cmp edi, [esp] |
||
1358 | jb @b |
||
1359 | pop edi |
||
1360 | popad |
||
1361 | ;clc ; automatically |
||
1362 | ret |
||
1363 | .err: |
||
1364 | pop edi |
||
1365 | popad |
||
1366 | stc |
||
1367 | ret |
||
1368 | |||
1369 | fat_gen_short_name: |
||
1370 | ; in: esi->long name |
||
1371 | ; edi->buffer (8+3=11 chars) |
||
1372 | ; out: buffer filled |
||
1373 | pushad |
||
1374 | mov eax, ' ' |
||
1375 | push edi |
||
1376 | stosd |
||
1377 | stosd |
||
1378 | stosd |
||
1379 | pop edi |
||
1380 | xor eax, eax |
||
1381 | push 8 |
||
1382 | pop ebx |
||
1383 | lea ecx, [edi+8] |
||
1384 | .loop: |
||
1385 | lodsb |
||
1386 | test al, al |
||
1387 | jz .done |
||
1388 | call char_toupper |
||
1389 | cmp al, ' ' |
||
1390 | jz .space |
||
1391 | cmp al, 80h |
||
1392 | ja .big |
||
1393 | test [fat_legal_chars+eax], 2 |
||
1394 | jnz .symbol |
||
1395 | .inv_symbol: |
||
1396 | mov al, '_' |
||
1397 | or bh, 1 |
||
1398 | .symbol: |
||
1399 | cmp al, '.' |
||
1400 | jz .dot |
||
1401 | .normal_symbol: |
||
1402 | dec bl |
||
1403 | jns .store |
||
1404 | mov bl, 0 |
||
1405 | .space: |
||
1406 | or bh, 1 |
||
1407 | jmp .loop |
||
1408 | .store: |
||
1409 | stosb |
||
1410 | jmp .loop |
||
1411 | .big: |
||
1412 | cmp al, 0xB0 |
||
1413 | jb .normal_symbol |
||
1414 | cmp al, 0xE0 |
||
1415 | jb .inv_symbol |
||
1416 | cmp al, 0xF0 |
||
1417 | jb .normal_symbol |
||
1418 | jmp .inv_symbol |
||
1419 | .dot: |
||
1420 | test bh, 2 |
||
1421 | jz .firstdot |
||
1422 | pop ebx |
||
1423 | add ebx, edi |
||
1424 | sub ebx, ecx |
||
1425 | push ebx |
||
1426 | cmp edi, ecx |
||
1427 | jbe .skip |
||
1428 | @@: |
||
1429 | dec edi |
||
1430 | mov al, ' ' |
||
1431 | xchg al, [edi] |
||
1432 | dec ebx |
||
1433 | mov [ebx], al |
||
1434 | cmp edi, ecx |
||
1435 | ja @b |
||
1436 | .skip: |
||
1437 | mov bh, 3 |
||
1438 | jmp @f |
||
1439 | .firstdot: |
||
1440 | cmp bl, 8 |
||
1441 | jz .space |
||
1442 | push edi |
||
1443 | or bh, 2 |
||
1444 | @@: |
||
1445 | mov edi, ecx |
||
1446 | mov bl, 3 |
||
1447 | jmp .loop |
||
1448 | .done: |
||
1449 | test bh, 2 |
||
1450 | jz @f |
||
1451 | pop edi |
||
1452 | @@: |
||
1453 | lea edi, [ecx-8] |
||
1454 | test bh, 1 |
||
1455 | jz @f |
||
1456 | call fat_next_short_name |
||
1457 | @@: |
||
1458 | popad |
||
1459 | ret |
||
1460 | |||
1461 | ;---------------------------------------------------------------- |
||
1462 | ; |
||
1463 | ; fs_RamdiskRewrite - LFN variant for writing sys floppy |
||
1464 | ; |
||
1465 | ; esi points to filename |
||
1466 | ; ebx ignored (reserved) |
||
1467 | ; ecx number of bytes to write, 0+ |
||
1468 | ; edx mem location to data |
||
1469 | ; |
||
1470 | ; ret ebx = number of written bytes |
||
1471 | ; eax = 0 ok read or other = errormsg |
||
1472 | ; |
||
1473 | ;-------------------------------------------------------------- |
||
1474 | @@: |
||
1475 | mov eax, ERROR_ACCESS_DENIED |
||
1476 | xor ebx, ebx |
||
1477 | ret |
||
1478 | |||
1479 | fs_RamdiskRewrite: |
||
1480 | cmp byte [esi], 0 |
||
1481 | jz @b |
||
91 | diamond | 1482 | pushad |
1483 | xor ebp, ebp |
||
83 | diamond | 1484 | push esi |
1485 | @@: |
||
1486 | lodsb |
||
1487 | test al, al |
||
1488 | jz @f |
||
1489 | cmp al, '/' |
||
1490 | jnz @b |
||
91 | diamond | 1491 | lea ebp, [esi-1] |
1492 | jmp @b |
||
1493 | @@: |
||
83 | diamond | 1494 | pop esi |
91 | diamond | 1495 | test ebp, ebp |
1496 | jnz .noroot |
||
1497 | push ramdisk_root_extend_dir |
||
1498 | push ramdisk_root_next_write |
||
1499 | push ebp |
||
1500 | push ramdisk_root_first |
||
1501 | push ramdisk_root_next |
||
1502 | jmp .common1 |
||
1503 | .noroot: |
||
1504 | ; check existence |
||
1505 | mov byte [ebp], 0 |
||
1506 | call rd_find_lfn |
||
1507 | mov byte [ebp], '/' |
||
1508 | lea esi, [ebp+1] |
||
1509 | jnc @f |
||
1510 | mov eax, ERROR_FILE_NOT_FOUND |
||
1511 | .ret1: |
||
1512 | mov [esp+28], eax |
||
1513 | popad |
||
83 | diamond | 1514 | xor ebx, ebx |
1515 | ret |
||
1516 | @@: |
||
91 | diamond | 1517 | test byte [edi+11], 0x10 ; must be directory |
1518 | mov eax, ERROR_ACCESS_DENIED |
||
1519 | jz .ret1 |
||
1520 | movzx ebp, word [edi+26] ; ebp=cluster |
||
1521 | mov eax, ERROR_FAT_TABLE |
||
1522 | cmp ebp, 2 |
||
1523 | jb .ret1 |
||
1524 | cmp ebp, 2849 |
||
1525 | jae .ret1 |
||
1526 | push ramdisk_notroot_extend_dir |
||
1527 | push ramdisk_notroot_next_write |
||
1528 | push ebp |
||
1529 | push ramdisk_notroot_first |
||
1530 | push ramdisk_notroot_next |
||
1531 | .common1: |
||
1532 | call fat_find_lfn |
||
83 | diamond | 1533 | jc .notfound |
91 | diamond | 1534 | ; found; must not be directory |
1535 | test byte [edi+11], 10h |
||
1536 | jz @f |
||
1537 | add esp, 20 |
||
1538 | popad |
||
1539 | mov eax, ERROR_ACCESS_DENIED |
||
1540 | xor ebx, ebx |
||
1541 | ret |
||
1542 | @@: |
||
1543 | ; delete FAT chain |
||
83 | diamond | 1544 | push edi |
1545 | xor eax, eax |
||
1546 | mov dword [edi+28], eax ; zero size |
||
1547 | xchg ax, word [edi+26] ; start cluster |
||
1548 | test eax, eax |
||
1549 | jz .done1 |
||
1550 | @@: |
||
1551 | cmp eax, 0xFF8 |
||
1552 | jae .done1 |
||
1553 | lea edi, [0x280000 + eax*2] ; position in FAT |
||
1554 | xor eax, eax |
||
1555 | xchg ax, [edi] |
||
1556 | jmp @b |
||
1557 | .done1: |
||
1558 | pop edi |
||
1559 | call get_time_for_file |
||
1560 | mov [edi+22], ax |
||
1561 | call get_date_for_file |
||
1562 | mov [edi+24], ax |
||
1563 | mov [edi+18], ax |
||
1564 | or byte [edi+11], 20h ; set 'archive' attribute |
||
1565 | jmp .doit |
||
1566 | .notfound: |
||
1567 | ; file is not found; generate short name |
||
1568 | call fat_name_is_legal |
||
1569 | jc @f |
||
91 | diamond | 1570 | add esp, 20 |
1571 | popad |
||
1572 | mov eax, ERROR_FILE_NOT_FOUND |
||
1573 | xor ebx, ebx |
||
1574 | ret |
||
83 | diamond | 1575 | @@: |
1576 | sub esp, 12 |
||
1577 | mov edi, esp |
||
1578 | call fat_gen_short_name |
||
1579 | .test_short_name_loop: |
||
91 | diamond | 1580 | push esi edi ecx |
1581 | mov esi, edi |
||
1582 | lea eax, [esp+12+12+8] |
||
1583 | mov [eax], ebp |
||
1584 | call dword [eax-4] |
||
1585 | jc .found |
||
83 | diamond | 1586 | .test_short_name_entry: |
91 | diamond | 1587 | cmp byte [edi+11], 0xF |
83 | diamond | 1588 | jz .test_short_name_cont |
1589 | mov ecx, 11 |
||
1590 | push esi edi |
||
1591 | repz cmpsb |
||
1592 | pop edi esi |
||
1593 | jz .short_name_found |
||
1594 | .test_short_name_cont: |
||
91 | diamond | 1595 | lea eax, [esp+12+12+8] |
1596 | call dword [eax-8] |
||
1597 | jnc .test_short_name_entry |
||
83 | diamond | 1598 | jmp .found |
1599 | .short_name_found: |
||
91 | diamond | 1600 | pop ecx edi esi |
83 | diamond | 1601 | call fat_next_short_name |
1602 | jnc .test_short_name_loop |
||
1603 | .disk_full: |
||
91 | diamond | 1604 | add esp, 12+20 |
1605 | popad |
||
83 | diamond | 1606 | mov eax, ERROR_DISK_FULL |
1607 | xor ebx, ebx |
||
1608 | ret |
||
1609 | .found: |
||
91 | diamond | 1610 | pop ecx edi esi |
83 | diamond | 1611 | ; now find space in directory |
1612 | ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' |
||
1613 | mov al, '~' |
||
1614 | push ecx edi |
||
1615 | mov ecx, 8 |
||
1616 | repnz scasb |
||
1617 | push 1 |
||
1618 | pop eax ; 1 entry |
||
1619 | jnz .notilde |
||
1620 | ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total |
||
1621 | xor eax, eax |
||
1622 | @@: |
||
1623 | cmp byte [esi], 0 |
||
1624 | jz @f |
||
1625 | inc esi |
||
1626 | inc eax |
||
1627 | jmp @b |
||
1628 | @@: |
||
1629 | sub esi, eax |
||
1630 | add eax, 12+13 |
||
1631 | mov ecx, 13 |
||
1632 | push edx |
||
1633 | cdq |
||
1634 | div ecx |
||
1635 | pop edx |
||
1636 | .notilde: |
||
91 | diamond | 1637 | push -1 |
1638 | push -1 |
||
83 | diamond | 1639 | ; find |
1640 | xor ecx, ecx |
||
91 | diamond | 1641 | push eax |
1642 | lea eax, [esp+12+8+12+8] |
||
1643 | mov [eax], ebp |
||
1644 | call dword [eax-4] |
||
1645 | pop eax |
||
83 | diamond | 1646 | .scan_dir: |
1647 | cmp byte [edi], 0 |
||
1648 | jz .free |
||
1649 | cmp byte [edi], 0xE5 |
||
1650 | jz .free |
||
1651 | xor ecx, ecx |
||
1652 | .scan_cont: |
||
91 | diamond | 1653 | push eax |
1654 | lea eax, [esp+12+8+12+8] |
||
1655 | call dword [eax-8] |
||
1656 | pop eax |
||
1657 | jnc .scan_dir |
||
1658 | push eax |
||
1659 | lea eax, [esp+12+8+12+8] |
||
1660 | call dword [eax+8] ; extend directory |
||
1661 | pop eax |
||
1662 | jnc .scan_dir |
||
1663 | add esp, 8+8+12+20 |
||
1664 | popad |
||
1665 | mov eax, ERROR_DISK_FULL |
||
1666 | xor ebx, ebx |
||
1667 | ret |
||
83 | diamond | 1668 | .free: |
91 | diamond | 1669 | test ecx, ecx |
1670 | jnz @f |
||
1671 | mov [esp], edi |
||
1672 | mov ecx, [esp+8+8+12+8] |
||
1673 | mov [esp+4], ecx |
||
1674 | xor ecx, ecx |
||
1675 | @@: |
||
83 | diamond | 1676 | inc ecx |
1677 | cmp ecx, eax |
||
1678 | jb .scan_cont |
||
1679 | ; found! |
||
1680 | ; calculate name checksum |
||
1681 | push esi ecx |
||
91 | diamond | 1682 | mov esi, [esp+8+8] |
83 | diamond | 1683 | mov ecx, 11 |
1684 | xor eax, eax |
||
1685 | @@: |
||
1686 | ror al, 1 |
||
1687 | add al, [esi] |
||
1688 | inc esi |
||
1689 | loop @b |
||
1690 | pop ecx esi |
||
91 | diamond | 1691 | pop edi |
1692 | pop dword [esp+8+12+8] |
||
83 | diamond | 1693 | ; edi points to last entry in free chunk |
1694 | dec ecx |
||
1695 | jz .nolfn |
||
1696 | push esi |
||
91 | diamond | 1697 | push eax |
1698 | mov al, 40h |
||
83 | diamond | 1699 | .writelfn: |
91 | diamond | 1700 | or al, cl |
1701 | mov esi, [esp+4] |
||
1702 | push ecx |
||
1703 | dec ecx |
||
1704 | imul ecx, 13 |
||
1705 | add esi, ecx |
||
83 | diamond | 1706 | stosb |
1707 | mov cl, 5 |
||
1708 | call .read_symbols |
||
1709 | mov ax, 0xF |
||
1710 | stosw |
||
91 | diamond | 1711 | mov al, [esp+4] |
83 | diamond | 1712 | stosb |
1713 | mov cl, 6 |
||
1714 | call .read_symbols |
||
1715 | xor eax, eax |
||
1716 | stosw |
||
1717 | mov cl, 2 |
||
1718 | call .read_symbols |
||
91 | diamond | 1719 | pop ecx |
1720 | lea eax, [esp+8+8+12+8] |
||
1721 | call dword [eax+4] ; next write |
||
1722 | xor eax, eax |
||
83 | diamond | 1723 | loop .writelfn |
91 | diamond | 1724 | pop eax |
83 | diamond | 1725 | pop esi |
1726 | .nolfn: |
||
1727 | xchg esi, [esp] |
||
1728 | mov ecx, 11 |
||
1729 | rep movsb |
||
1730 | mov word [edi], 20h ; attributes |
||
1731 | sub edi, 11 |
||
1732 | pop esi ecx |
||
1733 | add esp, 12 |
||
1734 | mov byte [edi+13], 0 ; tenths of a second at file creation time |
||
1735 | call get_time_for_file |
||
1736 | mov [edi+14], ax ; creation time |
||
1737 | mov [edi+22], ax ; last write time |
||
1738 | call get_date_for_file |
||
1739 | mov [edi+16], ax ; creation date |
||
1740 | mov [edi+24], ax ; last write date |
||
1741 | mov [edi+18], ax ; last access date |
||
1742 | and word [edi+20], 0 ; high word of cluster |
||
1743 | and word [edi+26], 0 ; low word of cluster - to be filled |
||
1744 | and dword [edi+28], 0 ; file size - to be filled |
||
1745 | .doit: |
||
91 | diamond | 1746 | push edx |
83 | diamond | 1747 | push ecx |
1748 | push edi |
||
1749 | add edi, 26 ; edi points to low word of cluster |
||
1750 | push edi |
||
1751 | jecxz .done |
||
1752 | mov ecx, 2849 |
||
1753 | mov edi, 0x280000 |
||
1754 | .write_loop: |
||
1755 | ; allocate new cluster |
||
1756 | xor eax, eax |
||
1757 | repnz scasw |
||
1758 | jnz .disk_full2 |
||
1759 | dec edi |
||
1760 | dec edi |
||
1761 | lea eax, [edi-0x280000] |
||
1762 | shr eax, 1 ; eax = cluster |
||
1763 | mov word [edi], 0xFFF ; mark as last cluster |
||
1764 | xchg edi, [esp] |
||
1765 | stosw |
||
1766 | pop edi |
||
1767 | push edi |
||
1768 | inc ecx |
||
1769 | ; write data |
||
1770 | shl eax, 9 |
||
1771 | add eax, 0x100000+31*512 |
||
1772 | mov ebx, edx |
||
1773 | xchg eax, ebx |
||
1774 | push ecx |
||
1775 | mov ecx, 512 |
||
1776 | cmp dword [esp+12], ecx |
||
1777 | jae @f |
||
1778 | mov ecx, [esp+12] |
||
1779 | @@: |
||
1780 | call memmove |
||
1781 | add edx, ecx |
||
1782 | sub [esp+12], ecx |
||
1783 | pop ecx |
||
1784 | jnz .write_loop |
||
1785 | .done: |
||
1786 | mov ebx, edx |
||
91 | diamond | 1787 | pop edi edi ecx edx |
83 | diamond | 1788 | sub ebx, edx |
1789 | mov [edi+28], ebx |
||
91 | diamond | 1790 | add esp, 20 |
1791 | popad |
||
83 | diamond | 1792 | xor eax, eax |
1793 | ret |
||
1794 | .disk_full2: |
||
1795 | mov ebx, edx |
||
91 | diamond | 1796 | pop edi edi ecx edx |
83 | diamond | 1797 | sub ebx, edx |
1798 | mov [edi+28], ebx |
||
91 | diamond | 1799 | add esp, 20 |
1800 | popad |
||
83 | diamond | 1801 | push ERROR_DISK_FULL |
1802 | pop eax |
||
1803 | ret |
||
1804 | |||
1805 | .read_symbol: |
||
1806 | or ax, -1 |
||
1807 | test esi, esi |
||
1808 | jz .retFFFF |
||
1809 | lodsb |
||
1810 | test al, al |
||
1811 | jnz ansi2uni_char |
||
1812 | xor eax, eax |
||
1813 | xor esi, esi |
||
1814 | .retFFFF: |
||
1815 | ret |
||
1816 | |||
1817 | .read_symbols: |
||
1818 | call .read_symbol |
||
1819 | stosw |
||
1820 | loop .read_symbols |
||
1821 | ret |
||
1822 | |||
86 | diamond | 1823 | fs_RamdiskGetFileInfo: |
1824 | cmp byte [esi], 0 |
||
1825 | jnz @f |
||
1826 | mov eax, 2 ; unsupported |
||
1827 | ret |
||
1828 | @@: |
||
1829 | push edi |
||
1830 | call rd_find_lfn |
||
1831 | fs_GetFileInfo_finish: |
||
1832 | jnc @f |
||
1833 | pop edi |
||
1834 | mov eax, ERROR_FILE_NOT_FOUND |
||
1835 | ret |
||
1836 | @@: |
||
1837 | push esi ebp |
||
1838 | xor ebp, ebp |
||
1839 | mov esi, edx |
||
1840 | and dword [esi+4], 0 |
||
1841 | call fat_entry_to_bdfe2 |
||
1842 | pop ebp esi |
||
1843 | pop edi |
||
1844 | xor eax, eax |
||
1845 | ret |
||
1846 | |||
1847 | fs_RamdiskSetFileInfo: |
||
1848 | cmp byte [esi], 0 |
||
1849 | jnz @f |
||
1850 | mov eax, 2 ; unsupported |
||
1851 | ret |
||
1852 | @@: |
||
1853 | push edi |
||
1854 | call rd_find_lfn |
||
1855 | jnc @f |
||
1856 | pop edi |
||
1857 | mov eax, ERROR_FILE_NOT_FOUND |
||
1858 | ret |
||
1859 | @@: |
||
1860 | call bdfe_to_fat_entry |
||
1861 | pop edi |
||
1862 | xor eax, eax |
||
1863 | ret |
||
1864 | |||
91 | diamond | 1865 | ;---------------------------------------------------------------- |
1866 | ; |
||
1867 | ; fs_RamdiskExecute - LFN variant for executing on sys floppy |
||
1868 | ; |
||
1869 | ; esi points to ramdisk filename (e.g. 'launcher') |
||
1870 | ; ebp points to full filename (e.g. '/rd/1/launcher') |
||
1871 | ; dword [ebx] = flags |
||
1872 | ; dword [ebx+4] = cmdline |
||
1873 | ; |
||
1874 | ; ret ebx,edx destroyed |
||
1875 | ; eax > 0 - PID, < 0 - error |
||
1876 | ; |
||
1877 | ;-------------------------------------------------------------- |
||
1878 | fs_RamdiskExecute: |
||
1879 | mov edx, [ebx] |
||
1880 | mov ebx, [ebx+4] |
||
1881 | test ebx, ebx |
||
1882 | jz @f |
||
1883 | add ebx, std_application_base_address |
||
1884 | @@: |
||
1885 | |||
1886 | ;---------------------------------------------------------------- |
||
1887 | ; |
||
1888 | ; fs_RamdiskExecute.flags - second entry |
||
1889 | ; |
||
1890 | ; esi points to ramdisk filename (kernel address) |
||
1891 | ; ebp points to full filename |
||
1892 | ; edx flags |
||
1893 | ; ebx cmdline (kernel address) |
||
1894 | ; |
||
1895 | ; ret eax > 0 - PID, < 0 - error |
||
1896 | ; |
||
1897 | ;-------------------------------------------------------------- |
||
1898 | |||
1899 | .flags: |
||
1900 | cmp byte [esi], 0 |
||
1901 | jnz @f |
||
1902 | ; cannot execute root! |
||
1903 | mov eax, -ERROR_ACCESS_DENIED |
||
1904 | ret |
||
1905 | @@: |
||
1906 | push edi |
||
1907 | call rd_find_lfn |
||
1908 | jnc .found |
||
1909 | pop edi |
||
1910 | mov eax, -ERROR_FILE_NOT_FOUND |
||
1911 | ret |
||
1912 | .found: |
||
1913 | movzx eax, word [edi+26] ; cluster |
||
1914 | push eax |
||
1915 | push dword [edi+28] ; size |
||
1916 | push .DoRead |
||
1917 | call fs_execute |
||
1918 | add esp, 12 |
||
1919 | pop edi |
||
1920 | ret |
||
1921 | |||
1922 | .DoRead: |
||
1923 | ; read next block |
||
1924 | ; in: eax->parameters, edi->buffer |
||
1925 | ; out: eax = error code |
||
1926 | pushad |
||
1927 | cmp dword [eax], 0 ; file size |
||
1928 | jz .eof |
||
1929 | mov edx, [eax+4] ; cluster |
||
1930 | lea esi, [edx+31] |
||
1931 | shl esi, 9 |
||
1932 | add esi, 0x100000 |
||
1933 | mov ecx, 512/4 |
||
1934 | rep movsd |
||
1935 | mov ecx, [eax] |
||
1936 | sub ecx, 512 |
||
1937 | jae @f |
||
1938 | add edi, ecx |
||
1939 | neg ecx |
||
1940 | push eax |
||
1941 | xor eax, eax |
||
1942 | rep stosb |
||
1943 | pop eax |
||
1944 | @@: |
||
1945 | mov [eax], ecx |
||
1946 | mov dx, [edx*2+0x280000] |
||
1947 | mov [eax+4], dx ; high word is already zero |
||
1948 | popad |
||
1949 | xor eax, eax |
||
1950 | ret |
||
1951 | .eof: |
||
1952 | popad |
||
1953 | mov eax, 6 |
||
1954 | ret |
||
1955 | |||
78 | diamond | 1956 | ; \end{diamond}>>=>=>=>=>>->->-> |