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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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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | |||
9 | ramdisk_free_space: |
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10 | ;--------------------------------------------- |
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11 | ; |
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12 | ; returns free space in edi |
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13 | ; rewr.by Mihasik |
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14 | ;--------------------------------------------- |
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15 | |||
16 | push eax ebx ecx |
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17 | |||
18 | mov edi,0x280000 ;start of FAT |
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19 | xor ax,ax ;Free cluster=0x0000 in FAT |
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20 | xor ebx,ebx ;counter |
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21 | mov ecx,2847 ;2849 ;2849 clusters |
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22 | cld |
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23 | rdfs1: |
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24 | repne scasw |
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25 | jnz rdfs2 ;if last cluster not 0 |
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26 | inc ebx |
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27 | jcxz rdfs2 ;if last cluster=0 |
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28 | jmp rdfs1 ;if not last |
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29 | rdfs2: |
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30 | shl ebx,9 ;free clusters*512 |
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31 | mov edi,ebx |
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32 | |||
33 | pop ecx ebx eax |
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34 | ret |
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35 | |||
36 | |||
37 | expand_filename: |
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38 | ;--------------------------------------------- |
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39 | ; |
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40 | ; exapand filename with '.' to 11 character |
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41 | ; eax - pointer to filename |
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42 | ;--------------------------------------------- |
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43 | |||
44 | push esi edi ebx |
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45 | |||
46 | mov edi,esp ; check for '.' in the name |
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47 | add edi,12+8 |
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48 | |||
49 | mov esi,eax |
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50 | |||
51 | mov eax,edi |
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52 | mov [eax+0],dword ' ' |
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53 | mov [eax+4],dword ' ' |
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54 | mov [eax+8],dword ' ' |
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55 | |||
56 | flr1: |
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57 | |||
58 | cmp [esi],byte '.' |
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59 | jne flr2 |
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60 | mov edi,eax |
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61 | add edi,7 |
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62 | jmp flr3 |
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63 | |||
64 | flr2: |
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65 | |||
66 | mov bl,[esi] |
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67 | mov [edi],bl |
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68 | |||
69 | flr3: |
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70 | |||
71 | inc esi |
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72 | inc edi |
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73 | |||
74 | mov ebx,eax |
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75 | add ebx,11 |
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76 | |||
77 | cmp edi,ebx |
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78 | jbe flr1 |
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79 | |||
80 | pop ebx edi esi |
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81 | ret |
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82 | |||
83 | fileread: |
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84 | ;---------------------------------------------------------------- |
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85 | ; |
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86 | ; fileread - sys floppy |
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87 | ; |
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88 | ; eax points to filename 11 chars |
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89 | ; ebx first wanted block ; 1+ ; if 0 then set to 1 |
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90 | ; ecx number of blocks to read ; 1+ ; if 0 then set to 1 |
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91 | ; edx mem location to return data |
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92 | ; esi length of filename 12*X 0=root |
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93 | ; |
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94 | ; ret ebx = size or 0xffffffff file not found |
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95 | ; eax = 0 ok read or other = errormsg |
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96 | ; |
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97 | ;-------------------------------------------------------------- |
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98 | test ebx,ebx ;if ebx=0 - set to 1 |
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99 | jnz frfl5 |
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100 | inc ebx |
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101 | frfl5: |
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102 | test ecx,ecx ;if ecx=0 - set to 1 |
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103 | jnz frfl6 |
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104 | inc ecx |
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105 | frfl6: |
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106 | test esi,esi ; return ramdisk root |
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107 | jnz fr_noroot ;if not root |
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108 | cmp ebx,14 ;14 clusters=root dir |
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109 | ja oorr |
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110 | cmp ecx,14 |
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111 | ja oorr |
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112 | jmp fr_do |
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113 | oorr: |
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114 | mov eax,5 ;out of root range (fnf) |
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115 | xor ebx,ebx |
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116 | dec ebx ;0xffffffff |
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117 | ret |
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118 | |||
119 | fr_do: ;reading rootdir |
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120 | mov edi,edx |
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121 | dec ebx |
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122 | push edx |
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123 | mov edx,ecx |
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124 | add edx,ebx |
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125 | cmp edx,14 ;ebx+ecx=14 |
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126 | pushf |
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127 | jbe fr_do1 |
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128 | sub edx,14 |
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129 | sub ecx,edx |
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130 | fr_do1: |
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131 | shl ebx,9 |
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132 | mov esi,0x100000+512*19 |
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133 | add esi,ebx |
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134 | shl ecx,7 |
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135 | cld |
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136 | rep movsd |
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137 | popf |
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138 | pop edx |
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139 | ; jae fr_do2 |
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140 | xor eax,eax ; ok read |
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141 | xor ebx,ebx |
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142 | ret |
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143 | fr_do2: ;if last cluster |
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144 | mov eax,6 ;end of file |
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145 | xor ebx,ebx |
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146 | ret |
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147 | |||
148 | fr_noroot: |
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149 | |||
150 | sub esp,32 |
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151 | call expand_filename |
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152 | |||
153 | dec ebx |
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154 | |||
155 | push eax |
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156 | |||
157 | push eax ebx ecx edx esi edi |
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158 | call rd_findfile |
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159 | je fifound |
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160 | add esp,32+28 ;if file not found |
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161 | ret |
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162 | |||
163 | fifound: |
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164 | |||
165 | mov ebx,[edi-11+28] ;file size |
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166 | mov [esp+20],ebx |
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167 | mov [esp+24],ebx |
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168 | add edi,0xf |
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169 | movzx eax,word [edi] |
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170 | mov edi,eax ;edi=cluster |
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171 | |||
172 | frnew: |
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173 | |||
174 | add eax,31 ;bootsector+2*fat+filenames |
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175 | shl eax,9 ;*512 |
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176 | add eax,0x100000 ;image base |
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177 | mov ebx,[esp+8] |
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178 | mov ecx,512 ;[esp+4] |
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179 | |||
180 | cmp [esp+16],dword 0 ; wanted cluster ? |
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181 | jne frfl7 |
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182 | call memmove |
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183 | add [esp+8],dword 512 |
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184 | dec dword [esp+12] ; last wanted cluster ? |
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185 | cmp [esp+12],dword 0 |
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186 | je frnoread |
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187 | jmp frfl8 |
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188 | frfl7: |
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189 | dec dword [esp+16] |
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190 | frfl8: |
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191 | shl edi,1 ;find next cluster from FAT |
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192 | add edi,0x280000 |
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193 | movzx eax,word [edi] |
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194 | mov edi,eax |
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195 | cmp edi,4095 ;eof - cluster |
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196 | jz frnoread2 |
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197 | |||
198 | cmp [esp+24],dword 512 ;eof - size |
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199 | jb frnoread |
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200 | sub [esp+24],dword 512 |
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201 | |||
202 | jmp frnew |
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203 | |||
204 | frnoread2: |
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205 | |||
206 | cmp [esp+16],dword 0 ; eof without read ? |
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207 | je frnoread |
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208 | |||
209 | pop edi esi edx ecx |
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210 | add esp,4 |
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211 | pop ebx ; ebx <- eax : size of file |
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212 | add esp,36 |
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213 | mov eax,6 ; end of file |
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214 | ret |
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215 | |||
216 | frnoread: |
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217 | |||
218 | pop edi esi edx ecx |
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219 | add esp,4 |
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220 | pop ebx ; ebx <- eax : size of file |
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221 | add esp,36 |
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222 | xor eax,eax ;read ok |
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223 | ret |
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224 | |||
225 | filedelete: |
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226 | ;-------------------------------------------- |
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227 | ; |
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228 | ; filedelete - sys floppy |
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229 | ; in: |
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230 | ; eax - pointer to filename 11 chars |
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231 | ; |
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232 | ; out: |
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233 | ; eax - 0 = successful, 5 = file not found |
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234 | ; |
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235 | ;-------------------------------------------- |
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236 | |||
237 | sub esp,32 |
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238 | call expand_filename |
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239 | |||
240 | push eax ebx ecx edx esi edi |
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241 | |||
242 | call rd_findfile |
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243 | je fifoundd |
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244 | pop edi esi edx ecx ebx eax ;file not found |
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245 | add esp,32 |
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246 | mov eax,5 |
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247 | ret |
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248 | |||
249 | fifoundd: |
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250 | |||
251 | mov [edi-11],byte 0xE5 ;mark filename deleted |
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252 | add edi,0xf |
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253 | movzx eax,word [edi] |
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254 | mov edi,eax ;edi = cluster |
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255 | |||
256 | frnewd: |
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257 | |||
258 | shl edi,1 ;find next cluster from FAT |
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259 | add edi,0x280000 |
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260 | movzx eax,word [edi] |
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261 | mov [edi],word 0x0 ;clear fat chain cluster |
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262 | mov edi,eax |
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263 | cmp edi,dword 0xff8 ;last cluster ? |
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264 | jb frnewd |
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265 | |||
266 | pop edi esi edx ecx ebx eax |
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267 | add esp,32 |
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268 | xor eax,eax ; file found |
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269 | ret |
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270 | |||
271 | |||
272 | |||
273 | filesave: |
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274 | ;---------------------------------------------------------- |
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275 | ; |
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276 | ; filesave - sys floppy |
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277 | ; |
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278 | ; eax points to filename 11 chars |
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279 | ; |
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280 | ; eax ; pointer to file name |
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281 | ; ebx ; buffer |
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282 | ; ecx ; count to write in bytes |
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283 | ; edx ; 0 create new , 1 append |
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284 | ; |
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285 | ;----------------------------------------------------------- |
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286 | |||
287 | sub esp,32 |
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288 | call expand_filename |
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289 | test edx,edx |
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290 | jnz fsdel |
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291 | pusha |
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292 | call filedelete |
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293 | popa |
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294 | |||
295 | fsdel: |
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296 | |||
297 | call ramdisk_free_space |
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298 | cmp ecx,edi |
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299 | jbe rd_do_save |
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300 | add esp,32 |
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301 | mov eax,8 ;disk full |
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302 | ret |
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303 | |||
304 | rd_do_save: |
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305 | |||
306 | push eax ebx ecx edx esi edi |
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307 | |||
308 | mov edi,0x100000+512*18+512 ;Point at directory |
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309 | mov edx,224 +1 |
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310 | ; find an empty spot for filename in the root dir |
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311 | l20ds: |
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312 | dec edx |
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313 | test edx,edx |
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314 | jz frnoreadds |
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315 | l21ds: |
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316 | cmp [edi],byte 0xE5 |
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317 | jz fifoundds |
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318 | cmp [edi],byte 0x0 |
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319 | jz fifoundds |
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320 | add edi,32 ; Advance to next entry |
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321 | jmp l20ds |
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322 | fifoundds: |
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323 | |||
324 | push edi ; move the filename to root dir |
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325 | mov esi,[esp+4+20] |
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326 | mov ecx,11 |
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327 | cld |
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328 | rep movsb |
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329 | pop edi |
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330 | mov edx,edi |
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331 | add edx,11+0xf ; edx <- cluster save position |
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332 | mov ebx,[esp+12] ; save file size |
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333 | mov [edi+28],ebx |
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334 | mov [edi+11],byte 0x20 ; attribute |
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335 | ; Ivan Poddubny 11/12/2003: |
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336 | call get_date_for_file ; from FAT32.INC |
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337 | mov [edi+24],ax ; date |
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338 | call get_time_for_file ; from FAT32.INC |
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339 | mov [edi+22],ax ; time |
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340 | ; End |
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341 | mov edi,0x280000 ;pointer to first cluster |
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342 | mov ecx,2849 |
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343 | cld |
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344 | frnewds: |
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345 | xor ax,ax |
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346 | repne scasw |
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347 | mov ebx,2848 |
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348 | sub ebx,ecx |
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349 | mov [edx],bx ; save next cluster pos. to prev cl. |
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350 | mov edx,edi ; next save pos abs mem add |
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351 | dec edx |
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352 | dec edx |
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353 | call fdc_filesave |
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354 | pusha ; move save to floppy cluster |
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355 | add ebx,31 |
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356 | shl ebx,9 |
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357 | add ebx,0x100000 |
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358 | mov eax,[esp+32+16] |
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359 | mov ecx,512 |
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360 | call memmove |
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361 | popa |
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362 | |||
363 | mov eax,[esp+12] |
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364 | cmp eax,512 |
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365 | jb flnsa |
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366 | sub eax,512 |
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367 | mov [esp+12],eax |
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368 | mov eax,[esp+16] |
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369 | add eax,512 |
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370 | mov [esp+16],eax |
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371 | jmp frnewds |
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372 | |||
373 | flnsa: |
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374 | dec edi |
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375 | dec edi |
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376 | mov [edi],word 4095 ; mark end of file - last cluster |
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377 | |||
378 | frnoreadds: |
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379 | |||
380 | pop edi esi edx ecx ebx eax |
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381 | add esp,32 |
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382 | |||
383 | pusha |
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384 | cli |
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385 | call fdc_commitfile |
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386 | sti |
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387 | popa |
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388 | |||
389 | xor eax,eax ;ok write |
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390 | ret |
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391 | |||
392 | rd_findfile: |
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393 | ;by Mihasik |
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394 | ;IN: eax - pointer to filename OUT: filestring+11 in edi or notZero in flags and fnf in eax,ebx |
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395 | |||
396 | mov edi,0x100000+512*18+512 ;Point at directory |
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397 | cld |
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398 | rd_newsearch: |
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399 | mov esi,eax |
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400 | mov ecx,11 |
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401 | rep cmpsb |
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402 | je rd_ff |
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403 | add cl,21 |
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404 | add edi,ecx |
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405 | cmp edi,0x100000+512*33 |
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406 | jb rd_newsearch |
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407 | mov eax,5 ;if file not found - eax=5 |
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408 | xor ebx,ebx |
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409 | dec ebx ;ebx=0xffffffff and zf=0 |
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410 | rd_ff: |
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411 | ret |
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412 | |||
413 | rd_getfileinfo: |
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414 | ;get date, time, size or attributes of file |
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415 | ;IN: eax - pointer to file, ebx - type of function: 12-get filesize, 13-get fileattr, 14-get filedate |
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416 | ;ecx - filelengh 0=root |
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417 | ;OUT: eax=0 - Ok or 5 - file not found ebx - date/time, size or attributes |
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418 | test ecx,ecx |
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419 | jnz no_getfinfo_root |
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420 | mov eax,5 ;if root - fnf |
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421 | xor ebx,ebx |
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422 | dec ebx |
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423 | ret |
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424 | no_getfinfo_root: ;if not root |
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425 | sub esp,32 |
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426 | call expand_filename |
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427 | call rd_findfile |
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428 | je fifoundi |
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429 | add esp,32 ;if file not found |
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430 | ret |
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431 | fifoundi: |
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432 | cmp ebx,13 |
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433 | jne no_rd_attr |
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434 | movzx ebx,byte [edi] ;get attributes |
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435 | jmp rd_getfileinfo_end |
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436 | no_rd_attr: |
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437 | cmp ebx,14 |
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438 | jne no_rd_date |
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439 | mov ebx,dword [edi+11] ;get date/time |
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440 | jmp rd_getfileinfo_end |
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441 | no_rd_date: |
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442 | mov ebx,dword [edi+17] ;get size |
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443 | rd_getfileinfo_end: |
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444 | xor eax,eax |
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445 | add esp,32 |
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446 | ret->->-> |