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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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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
5 | halyavin | 8 | ; calculate fat chain |
1 | ha | 9 | |
5 | halyavin | 10 | calculatefatchain: |
11 | |||
12 | pushad |
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13 | |||
14 | mov esi,0x100000+512 |
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15 | mov edi,0x280000 |
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16 | |||
17 | fcnew: |
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18 | mov eax,dword [esi] |
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19 | mov ebx,dword [esi+4] |
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20 | mov ecx,dword [esi+8] |
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21 | mov edx,ecx |
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22 | shr edx,4 ;8 ok |
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23 | shr dx,4 ;7 ok |
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24 | xor ch,ch |
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25 | shld ecx,ebx,20 ;6 ok |
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26 | shr cx,4 ;5 ok |
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27 | shld ebx,eax,12 |
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28 | and ebx,0x0fffffff ;4 ok |
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29 | shr bx,4 ;3 ok |
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30 | shl eax,4 |
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31 | and eax,0x0fffffff ;2 ok |
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32 | shr ax,4 ;1 ok |
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33 | mov dword [edi],eax |
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34 | add edi,4 |
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35 | mov dword [edi],ebx |
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36 | add edi,4 |
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37 | mov dword [edi],ecx |
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38 | add edi,4 |
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39 | mov dword [edi],edx |
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40 | add edi,4 |
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41 | add esi,12 |
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42 | |||
43 | cmp edi,0x280000+2856*2 ;2849 clusters |
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44 | jnz fcnew |
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45 | |||
46 | popad |
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47 | ret |
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48 | |||
49 | |||
50 | restorefatchain: ; restore fat chain |
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51 | |||
52 | pushad |
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53 | |||
54 | mov esi,0x280000 |
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55 | mov edi,0x100000+512 |
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56 | |||
57 | fcnew2: |
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58 | mov eax,dword [esi] |
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59 | mov ebx,dword [esi+4] |
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60 | shl ax,4 |
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61 | shl eax,4 |
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62 | shl bx,4 |
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63 | shr ebx,4 |
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64 | shrd eax,ebx,8 |
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65 | shr ebx,8 |
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66 | mov dword [edi],eax |
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67 | add edi,4 |
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68 | mov word [edi],bx |
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69 | add edi,2 |
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70 | add esi,8 |
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71 | |||
72 | cmp edi,0x100000+512+4278 ;4274 bytes - all used FAT |
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73 | jb fcnew2 |
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74 | |||
75 | mov esi,0x100000+512 ; duplicate fat chain |
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76 | mov edi,0x100000+512+0x1200 |
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77 | mov ecx,1069 ;4274/4 |
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78 | cld |
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79 | rep movsd |
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80 | |||
81 | popad |
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82 | ret |
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83 | |||
84 | |||
1 | ha | 85 | ramdisk_free_space: |
86 | ;--------------------------------------------- |
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87 | ; |
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88 | ; returns free space in edi |
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89 | ; rewr.by Mihasik |
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90 | ;--------------------------------------------- |
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91 | |||
92 | push eax ebx ecx |
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93 | |||
94 | mov edi,0x280000 ;start of FAT |
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95 | xor ax,ax ;Free cluster=0x0000 in FAT |
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96 | xor ebx,ebx ;counter |
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5 | halyavin | 97 | mov ecx,2849 ;2849 clusters |
1 | ha | 98 | cld |
99 | rdfs1: |
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100 | repne scasw |
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101 | jnz rdfs2 ;if last cluster not 0 |
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102 | inc ebx |
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103 | jcxz rdfs2 ;if last cluster=0 |
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104 | jmp rdfs1 ;if not last |
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105 | rdfs2: |
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106 | shl ebx,9 ;free clusters*512 |
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107 | mov edi,ebx |
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108 | |||
109 | pop ecx ebx eax |
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110 | ret |
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111 | |||
112 | |||
113 | expand_filename: |
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114 | ;--------------------------------------------- |
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115 | ; |
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116 | ; exapand filename with '.' to 11 character |
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117 | ; eax - pointer to filename |
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118 | ;--------------------------------------------- |
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119 | |||
120 | push esi edi ebx |
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121 | |||
122 | mov edi,esp ; check for '.' in the name |
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123 | add edi,12+8 |
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124 | |||
125 | mov esi,eax |
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126 | |||
127 | mov eax,edi |
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128 | mov [eax+0],dword ' ' |
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129 | mov [eax+4],dword ' ' |
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130 | mov [eax+8],dword ' ' |
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131 | |||
132 | flr1: |
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133 | |||
134 | cmp [esi],byte '.' |
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135 | jne flr2 |
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136 | mov edi,eax |
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137 | add edi,7 |
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138 | jmp flr3 |
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139 | |||
140 | flr2: |
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141 | |||
142 | mov bl,[esi] |
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143 | mov [edi],bl |
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144 | |||
145 | flr3: |
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146 | |||
147 | inc esi |
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148 | inc edi |
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149 | |||
150 | mov ebx,eax |
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151 | add ebx,11 |
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152 | |||
153 | cmp edi,ebx |
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154 | jbe flr1 |
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155 | |||
156 | pop ebx edi esi |
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157 | ret |
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158 | |||
159 | fileread: |
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160 | ;---------------------------------------------------------------- |
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161 | ; |
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162 | ; fileread - sys floppy |
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163 | ; |
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164 | ; eax points to filename 11 chars |
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165 | ; ebx first wanted block ; 1+ ; if 0 then set to 1 |
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166 | ; ecx number of blocks to read ; 1+ ; if 0 then set to 1 |
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167 | ; edx mem location to return data |
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168 | ; esi length of filename 12*X 0=root |
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169 | ; |
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170 | ; ret ebx = size or 0xffffffff file not found |
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171 | ; eax = 0 ok read or other = errormsg |
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172 | ; |
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173 | ;-------------------------------------------------------------- |
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174 | test ebx,ebx ;if ebx=0 - set to 1 |
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175 | jnz frfl5 |
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176 | inc ebx |
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177 | frfl5: |
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178 | test ecx,ecx ;if ecx=0 - set to 1 |
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179 | jnz frfl6 |
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180 | inc ecx |
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181 | frfl6: |
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182 | test esi,esi ; return ramdisk root |
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183 | jnz fr_noroot ;if not root |
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184 | cmp ebx,14 ;14 clusters=root dir |
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185 | ja oorr |
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186 | cmp ecx,14 |
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187 | ja oorr |
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188 | jmp fr_do |
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189 | oorr: |
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190 | mov eax,5 ;out of root range (fnf) |
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191 | xor ebx,ebx |
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192 | dec ebx ;0xffffffff |
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193 | ret |
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194 | |||
195 | fr_do: ;reading rootdir |
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196 | mov edi,edx |
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197 | dec ebx |
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198 | push edx |
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199 | mov edx,ecx |
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200 | add edx,ebx |
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5 | halyavin | 201 | cmp edx,15 ;ebx+ecx=14+1 |
1 | ha | 202 | pushf |
203 | jbe fr_do1 |
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204 | sub edx,14 |
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205 | sub ecx,edx |
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206 | fr_do1: |
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207 | shl ebx,9 |
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208 | mov esi,0x100000+512*19 |
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209 | add esi,ebx |
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210 | shl ecx,7 |
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211 | cld |
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212 | rep movsd |
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213 | popf |
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214 | pop edx |
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5 | halyavin | 215 | jae fr_do2 |
1 | ha | 216 | xor eax,eax ; ok read |
217 | xor ebx,ebx |
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218 | ret |
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219 | fr_do2: ;if last cluster |
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220 | mov eax,6 ;end of file |
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221 | xor ebx,ebx |
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222 | ret |
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223 | |||
224 | fr_noroot: |
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225 | |||
226 | sub esp,32 |
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227 | call expand_filename |
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228 | |||
229 | dec ebx |
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230 | |||
231 | push eax |
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232 | |||
233 | push eax ebx ecx edx esi edi |
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234 | call rd_findfile |
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235 | je fifound |
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236 | add esp,32+28 ;if file not found |
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237 | ret |
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238 | |||
239 | fifound: |
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240 | |||
241 | mov ebx,[edi-11+28] ;file size |
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242 | mov [esp+20],ebx |
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243 | mov [esp+24],ebx |
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244 | add edi,0xf |
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245 | movzx eax,word [edi] |
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246 | mov edi,eax ;edi=cluster |
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247 | |||
248 | frnew: |
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249 | |||
250 | add eax,31 ;bootsector+2*fat+filenames |
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251 | shl eax,9 ;*512 |
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252 | add eax,0x100000 ;image base |
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253 | mov ebx,[esp+8] |
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254 | mov ecx,512 ;[esp+4] |
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255 | |||
256 | cmp [esp+16],dword 0 ; wanted cluster ? |
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257 | jne frfl7 |
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258 | call memmove |
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259 | add [esp+8],dword 512 |
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260 | dec dword [esp+12] ; last wanted cluster ? |
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261 | je frnoread |
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262 | jmp frfl8 |
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263 | frfl7: |
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264 | dec dword [esp+16] |
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265 | frfl8: |
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71 | diamond | 266 | movzx eax,word [edi*2+0x280000] ; find next cluster from FAT |
1 | ha | 267 | mov edi,eax |
268 | cmp edi,4095 ;eof - cluster |
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269 | jz frnoread2 |
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270 | |||
271 | cmp [esp+24],dword 512 ;eof - size |
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272 | jb frnoread |
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273 | sub [esp+24],dword 512 |
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274 | |||
275 | jmp frnew |
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276 | |||
277 | frnoread2: |
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278 | |||
279 | cmp [esp+16],dword 0 ; eof without read ? |
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280 | je frnoread |
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281 | |||
282 | pop edi esi edx ecx |
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283 | add esp,4 |
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284 | pop ebx ; ebx <- eax : size of file |
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285 | add esp,36 |
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286 | mov eax,6 ; end of file |
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287 | ret |
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288 | |||
289 | frnoread: |
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290 | |||
291 | pop edi esi edx ecx |
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292 | add esp,4 |
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293 | pop ebx ; ebx <- eax : size of file |
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294 | add esp,36 |
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295 | xor eax,eax ;read ok |
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296 | ret |
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297 | |||
298 | filedelete: |
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299 | ;-------------------------------------------- |
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300 | ; |
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301 | ; filedelete - sys floppy |
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302 | ; in: |
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303 | ; eax - pointer to filename 11 chars |
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304 | ; |
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305 | ; out: |
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306 | ; eax - 0 = successful, 5 = file not found |
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307 | ; |
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308 | ;-------------------------------------------- |
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309 | |||
310 | sub esp,32 |
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311 | call expand_filename |
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312 | |||
313 | push eax ebx ecx edx esi edi |
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314 | |||
315 | call rd_findfile |
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316 | je fifoundd |
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317 | pop edi esi edx ecx ebx eax ;file not found |
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318 | add esp,32 |
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319 | mov eax,5 |
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320 | ret |
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321 | |||
322 | fifoundd: |
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323 | |||
324 | mov [edi-11],byte 0xE5 ;mark filename deleted |
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325 | add edi,0xf |
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326 | movzx eax,word [edi] |
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327 | mov edi,eax ;edi = cluster |
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328 | |||
329 | frnewd: |
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330 | |||
331 | shl edi,1 ;find next cluster from FAT |
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332 | add edi,0x280000 |
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333 | movzx eax,word [edi] |
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334 | mov [edi],word 0x0 ;clear fat chain cluster |
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335 | mov edi,eax |
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336 | cmp edi,dword 0xff8 ;last cluster ? |
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337 | jb frnewd |
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338 | |||
339 | pop edi esi edx ecx ebx eax |
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340 | add esp,32 |
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341 | xor eax,eax ; file found |
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342 | ret |
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343 | |||
344 | |||
345 | |||
346 | filesave: |
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347 | ;---------------------------------------------------------- |
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348 | ; |
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349 | ; filesave - sys floppy |
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350 | ; |
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351 | ; eax points to filename 11 chars |
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352 | ; |
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353 | ; eax ; pointer to file name |
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354 | ; ebx ; buffer |
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355 | ; ecx ; count to write in bytes |
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356 | ; edx ; 0 create new , 1 append |
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357 | ; |
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358 | ;----------------------------------------------------------- |
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359 | |||
360 | sub esp,32 |
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361 | call expand_filename |
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362 | test edx,edx |
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363 | jnz fsdel |
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364 | pusha |
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365 | call filedelete |
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366 | popa |
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367 | |||
368 | fsdel: |
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369 | |||
370 | call ramdisk_free_space |
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371 | cmp ecx,edi |
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372 | jbe rd_do_save |
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373 | add esp,32 |
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374 | mov eax,8 ;disk full |
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375 | ret |
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376 | |||
377 | rd_do_save: |
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378 | |||
379 | push eax ebx ecx edx esi edi |
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380 | |||
381 | mov edi,0x100000+512*18+512 ;Point at directory |
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382 | mov edx,224 +1 |
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383 | ; find an empty spot for filename in the root dir |
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384 | l20ds: |
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385 | dec edx |
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386 | test edx,edx |
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387 | jz frnoreadds |
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388 | l21ds: |
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389 | cmp [edi],byte 0xE5 |
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390 | jz fifoundds |
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391 | cmp [edi],byte 0x0 |
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392 | jz fifoundds |
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393 | add edi,32 ; Advance to next entry |
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394 | jmp l20ds |
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395 | fifoundds: |
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396 | |||
397 | push edi ; move the filename to root dir |
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398 | mov esi,[esp+4+20] |
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399 | mov ecx,11 |
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400 | cld |
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401 | rep movsb |
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402 | pop edi |
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403 | mov edx,edi |
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404 | add edx,11+0xf ; edx <- cluster save position |
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405 | mov ebx,[esp+12] ; save file size |
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406 | mov [edi+28],ebx |
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407 | mov [edi+11],byte 0x20 ; attribute |
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408 | ; Ivan Poddubny 11/12/2003: |
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409 | call get_date_for_file ; from FAT32.INC |
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410 | mov [edi+24],ax ; date |
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411 | call get_time_for_file ; from FAT32.INC |
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412 | mov [edi+22],ax ; time |
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413 | ; End |
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414 | mov edi,0x280000 ;pointer to first cluster |
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415 | mov ecx,2849 |
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416 | cld |
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417 | frnewds: |
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418 | xor ax,ax |
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419 | repne scasw |
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420 | mov ebx,2848 |
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421 | sub ebx,ecx |
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422 | mov [edx],bx ; save next cluster pos. to prev cl. |
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423 | mov edx,edi ; next save pos abs mem add |
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424 | dec edx |
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425 | dec edx |
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426 | call fdc_filesave |
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427 | pusha ; move save to floppy cluster |
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428 | add ebx,31 |
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429 | shl ebx,9 |
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430 | add ebx,0x100000 |
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431 | mov eax,[esp+32+16] |
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432 | mov ecx,512 |
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433 | call memmove |
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434 | popa |
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435 | |||
436 | mov eax,[esp+12] |
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437 | cmp eax,512 |
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48 | halyavin | 438 | jbe flnsa |
1 | ha | 439 | sub eax,512 |
440 | mov [esp+12],eax |
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441 | mov eax,[esp+16] |
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442 | add eax,512 |
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443 | mov [esp+16],eax |
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444 | jmp frnewds |
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445 | |||
446 | flnsa: |
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447 | dec edi |
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448 | dec edi |
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449 | mov [edi],word 4095 ; mark end of file - last cluster |
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450 | |||
451 | frnoreadds: |
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452 | |||
453 | pop edi esi edx ecx ebx eax |
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454 | add esp,32 |
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455 | |||
19 | mario79 | 456 | ; pusha |
457 | ; cli |
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458 | ; call fdc_commitfile |
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459 | ; sti |
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460 | ; popa |
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1 | ha | 461 | |
462 | xor eax,eax ;ok write |
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463 | ret |
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464 | |||
465 | rd_findfile: |
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466 | ;by Mihasik |
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467 | ;IN: eax - pointer to filename OUT: filestring+11 in edi or notZero in flags and fnf in eax,ebx |
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468 | |||
469 | mov edi,0x100000+512*18+512 ;Point at directory |
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470 | cld |
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471 | rd_newsearch: |
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472 | mov esi,eax |
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473 | mov ecx,11 |
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474 | rep cmpsb |
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475 | je rd_ff |
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476 | add cl,21 |
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477 | add edi,ecx |
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478 | cmp edi,0x100000+512*33 |
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479 | jb rd_newsearch |
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480 | mov eax,5 ;if file not found - eax=5 |
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481 | xor ebx,ebx |
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482 | dec ebx ;ebx=0xffffffff and zf=0 |
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483 | rd_ff: |
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484 | ret |
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485 | |||
486 | rd_getfileinfo: |
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487 | ;get date, time, size or attributes of file |
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488 | ;IN: eax - pointer to file, ebx - type of function: 12-get filesize, 13-get fileattr, 14-get filedate |
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489 | ;ecx - filelengh 0=root |
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490 | ;OUT: eax=0 - Ok or 5 - file not found ebx - date/time, size or attributes |
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491 | test ecx,ecx |
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492 | jnz no_getfinfo_root |
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493 | mov eax,5 ;if root - fnf |
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494 | xor ebx,ebx |
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495 | dec ebx |
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496 | ret |
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497 | no_getfinfo_root: ;if not root |
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498 | sub esp,32 |
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499 | call expand_filename |
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500 | call rd_findfile |
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501 | je fifoundi |
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502 | add esp,32 ;if file not found |
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503 | ret |
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504 | fifoundi: |
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505 | cmp ebx,13 |
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506 | jne no_rd_attr |
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507 | movzx ebx,byte [edi] ;get attributes |
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508 | jmp rd_getfileinfo_end |
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509 | no_rd_attr: |
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510 | cmp ebx,14 |
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511 | jne no_rd_date |
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512 | mov ebx,dword [edi+11] ;get date/time |
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513 | jmp rd_getfileinfo_end |
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514 | no_rd_date: |
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515 | mov ebx,dword [edi+17] ;get size |
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516 | rd_getfileinfo_end: |
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517 | xor eax,eax |
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518 | add esp,32 |
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71 | diamond | 519 | ret |
520 | |||
521 | ; \begin{diamond} |
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522 | |||
523 | uni2ansi_str: |
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524 | ; convert UNICODE zero-terminated string to ASCII-string (codepage 866) |
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525 | ; in: esi->source, edi->buffer (may be esi=edi) |
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526 | ; destroys: eax,esi,edi |
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527 | lodsw |
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528 | test ax, ax |
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529 | jz .done |
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530 | cmp ax, 0x80 |
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531 | jb .ascii |
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532 | cmp ax, 0x401 |
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533 | jz .yo1 |
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534 | cmp ax, 0x451 |
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535 | jz .yo2 |
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536 | cmp ax, 0x410 |
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537 | jb .unk |
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538 | cmp ax, 0x440 |
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539 | jb .rus1 |
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540 | cmp ax, 0x450 |
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541 | jb .rus2 |
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542 | .unk: |
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543 | mov al, '_' |
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544 | jmp .doit |
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545 | .yo1: |
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546 | mov al, 'ð' |
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547 | jmp .doit |
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548 | .yo2: |
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549 | mov al, 'ñ' |
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550 | jmp .doit |
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551 | .rus1: |
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552 | ; 0x410-0x43F -> 0x80-0xAF |
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553 | add al, 0x70 |
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554 | jmp .doit |
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555 | .rus2: |
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75 | diamond | 556 | ; 0x440-0x44F -> 0xE0-0xEF |
71 | diamond | 557 | add al, 0xA0 |
558 | .ascii: |
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559 | .doit: |
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560 | stosb |
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561 | jmp uni2ansi_str |
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562 | .done: |
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563 | mov byte [edi], 0 |
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564 | ret |
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565 | |||
75 | diamond | 566 | ansi2uni_char: |
567 | ; convert ANSI character in al to UNICODE character in ax, using cp866 encoding |
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568 | mov ah, 0 |
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569 | ; 0x00-0x7F - trivial map |
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570 | cmp al, 0x80 |
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571 | jb .ret |
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572 | ; 0x80-0xAF -> 0x410-0x43F |
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573 | cmp al, 0xB0 |
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574 | jae @f |
||
575 | add ax, 0x410-0x80 |
||
576 | .ret: |
||
577 | ret |
||
578 | @@: |
||
579 | ; 0xE0-0xEF -> 0x440-0x44F |
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580 | cmp al, 0xE0 |
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581 | jb .unk |
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582 | cmp al, 0xF0 |
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583 | jae @f |
||
584 | add ax, 0x440-0xE0 |
||
585 | ret |
||
586 | ; 0xF0 -> 0x401 |
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587 | ; 0xF1 -> 0x451 |
||
588 | @@: |
||
589 | cmp al, 'ð' |
||
590 | jz .yo1 |
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591 | cmp al, 'ñ' |
||
592 | jz .yo2 |
||
593 | .unk: |
||
594 | mov al, '_' ; ah=0 |
||
595 | ret |
||
596 | .yo1: |
||
597 | mov ax, 0x401 |
||
598 | ret |
||
599 | .yo2: |
||
600 | mov ax, 0x451 |
||
601 | ret |
||
602 | |||
71 | diamond | 603 | char_toupper: |
604 | ; convert character to uppercase, using cp866 encoding |
||
605 | ; in: al=symbol |
||
606 | ; out: al=converted symbol |
||
607 | cmp al, 'a' |
||
608 | jb .ret |
||
609 | cmp al, 'z' |
||
610 | jbe .az |
||
611 | cmp al, ' ' |
||
612 | jb .ret |
||
613 | cmp al, 'à' |
||
614 | jb .rus1 |
||
615 | cmp al, 'ï' |
||
616 | ja .ret |
||
617 | ; 0xE0-0xEF -> 0x90-0x9F |
||
618 | sub al, 'à'-'' |
||
619 | .ret: |
||
620 | ret |
||
621 | .rus1: |
||
622 | ; 0xA0-0xAF -> 0x80-0x8F |
||
623 | .az: |
||
624 | and al, not 0x20 |
||
625 | ret |
||
626 | |||
627 | fat_get_name: |
||
628 | ; in: edi->FAT entry |
||
629 | ; out: CF=1 - no valid entry |
||
630 | ; else CF=0 and ebp->ASCIIZ-name |
||
631 | ; (maximum length of filename is 255 (wide) symbols without trailing 0, |
||
632 | ; but implementation requires buffer 261 words) |
||
633 | ; destroys eax |
||
634 | cmp byte [edi], 0 |
||
635 | jz .no |
||
636 | cmp byte [edi], 0xE5 |
||
637 | jnz @f |
||
638 | .no: |
||
639 | stc |
||
640 | ret |
||
641 | @@: |
||
642 | cmp byte [edi+11], 0xF |
||
643 | jz .longname |
||
644 | push ecx |
||
645 | mov ecx, 8 |
||
75 | diamond | 646 | push edi ebp ecx |
647 | cmp byte [ebp-4], 0 |
||
648 | jnz .unicode_short |
||
71 | diamond | 649 | @@: |
650 | mov al, [edi] |
||
651 | inc edi |
||
652 | mov [ebp], al |
||
653 | inc ebp |
||
654 | loop @b |
||
655 | pop ecx |
||
656 | @@: |
||
657 | cmp byte [ebp-1], ' ' |
||
658 | jnz @f |
||
659 | dec ebp |
||
660 | loop @b |
||
661 | @@: |
||
662 | mov byte [ebp], '.' |
||
663 | inc ebp |
||
664 | mov ecx, 3 |
||
665 | push ecx |
||
666 | @@: |
||
667 | mov al, [edi] |
||
668 | inc edi |
||
669 | mov [ebp], al |
||
670 | inc ebp |
||
671 | loop @b |
||
672 | pop ecx |
||
673 | @@: |
||
674 | cmp byte [ebp-1], ' ' |
||
675 | jnz @f |
||
676 | dec ebp |
||
677 | loop @b |
||
678 | dec ebp |
||
679 | @@: |
||
680 | and byte [ebp], 0 ; CF=0 |
||
681 | pop ebp edi ecx |
||
682 | ret |
||
75 | diamond | 683 | .unicode_short: |
684 | @@: |
||
685 | mov al, [edi] |
||
686 | inc edi |
||
687 | call ansi2uni_char |
||
688 | mov [ebp], ax |
||
689 | inc ebp |
||
690 | inc ebp |
||
691 | loop @b |
||
692 | pop ecx |
||
693 | @@: |
||
694 | cmp word [ebp-2], ' ' |
||
695 | jnz @f |
||
696 | dec ebp |
||
697 | dec ebp |
||
698 | loop @b |
||
699 | @@: |
||
700 | mov word [ebp], '.' |
||
701 | inc ebp |
||
702 | inc ebp |
||
703 | mov ecx, 3 |
||
704 | push ecx |
||
705 | @@: |
||
706 | mov al, [edi] |
||
707 | inc edi |
||
708 | call ansi2uni_char |
||
709 | mov [ebp], ax |
||
710 | inc ebp |
||
711 | inc ebp |
||
712 | loop @b |
||
713 | pop ecx |
||
714 | @@: |
||
715 | cmp word [ebp-2], ' ' |
||
716 | jnz @f |
||
717 | dec ebp |
||
718 | dec ebp |
||
719 | loop @b |
||
720 | dec ebp |
||
721 | dec ebp |
||
722 | @@: |
||
723 | and word [ebp], 0 ; CF=0 |
||
724 | pop ebp edi ecx |
||
725 | ret |
||
71 | diamond | 726 | .longname: |
727 | ; LFN |
||
728 | mov al, byte [edi] |
||
729 | and eax, 0x3F |
||
730 | dec eax |
||
731 | cmp al, 20 |
||
732 | jae .no ; ignore invalid entries |
||
733 | mov word [ebp+260*2], 0 ; force null-terminating for orphans |
||
734 | imul eax, 13*2 |
||
735 | add ebp, eax |
||
736 | test byte [edi], 0x40 |
||
737 | jz @f |
||
738 | mov word [ebp+13*2], 0 |
||
739 | @@: |
||
740 | push eax |
||
741 | ; now copy name from edi to ebp ... |
||
742 | mov eax, [edi+1] |
||
743 | mov [ebp], eax ; symbols 1,2 |
||
744 | mov eax, [edi+5] |
||
745 | mov [ebp+4], eax ; 3,4 |
||
746 | mov eax, [edi+9] |
||
747 | mov [ebp+8], ax ; 5 |
||
748 | mov eax, [edi+14] |
||
749 | mov [ebp+10], eax ; 6,7 |
||
750 | mov eax, [edi+18] |
||
751 | mov [ebp+14], eax ; 8,9 |
||
752 | mov eax, [edi+22] |
||
753 | mov [ebp+18], eax ; 10,11 |
||
754 | mov eax, [edi+28] |
||
755 | mov [ebp+22], eax ; 12,13 |
||
756 | ; ... done |
||
757 | pop eax |
||
758 | sub ebp, eax |
||
759 | test eax, eax |
||
760 | jz @f |
||
761 | ; if this is not first entry, more processing required |
||
762 | stc |
||
763 | ret |
||
764 | @@: |
||
765 | ; if this is first entry: |
||
75 | diamond | 766 | cmp byte [ebp-4], 0 |
767 | jnz .ret |
||
71 | diamond | 768 | ; buffer at ebp contains UNICODE name, convert it to ANSI |
769 | push esi edi |
||
770 | mov esi, ebp |
||
771 | mov edi, ebp |
||
772 | call uni2ansi_str |
||
773 | pop edi esi |
||
75 | diamond | 774 | .ret: |
71 | diamond | 775 | clc |
776 | ret |
||
777 | |||
778 | fat_compare_name: |
||
779 | ; compares ASCIIZ-names, case-insensitive (cp866 encoding) |
||
780 | ; in: esi->name, ebp->name |
||
781 | ; out: if names match: ZF=1 and esi->next component of name |
||
782 | ; else: ZF=0, esi is not changed |
||
783 | ; destroys eax |
||
784 | push ebp esi |
||
785 | .loop: |
||
786 | mov al, [ebp] |
||
787 | inc ebp |
||
788 | call char_toupper |
||
789 | push eax |
||
790 | lodsb |
||
791 | call char_toupper |
||
792 | cmp al, [esp] |
||
793 | jnz .done |
||
794 | pop eax |
||
795 | test al, al |
||
796 | jnz .loop |
||
797 | dec esi |
||
798 | pop eax |
||
799 | pop ebp |
||
800 | xor eax, eax ; set ZF flag |
||
801 | ret |
||
802 | .done: |
||
803 | cmp al, '/' |
||
804 | jnz @f |
||
805 | cmp byte [esp], 0 |
||
806 | jnz @f |
||
807 | mov [esp+4], esi |
||
808 | @@: |
||
809 | pop eax |
||
810 | pop esi ebp |
||
811 | ret |
||
812 | |||
75 | diamond | 813 | fat_time_to_bdfe: |
814 | ; in: eax=FAT time |
||
815 | ; out: eax=BDFE time |
||
816 | push ecx edx |
||
817 | mov ecx, eax |
||
818 | mov edx, eax |
||
819 | shr eax, 11 |
||
820 | shl eax, 16 ; hours |
||
821 | and edx, 0x1F |
||
822 | add edx, edx |
||
823 | mov al, dl ; seconds |
||
824 | shr ecx, 5 |
||
825 | and ecx, 0x3F |
||
826 | mov ah, cl ; minutes |
||
827 | pop edx ecx |
||
828 | ret |
||
829 | |||
830 | fat_date_to_bdfe: |
||
831 | push ecx edx |
||
832 | mov ecx, eax |
||
833 | mov edx, eax |
||
834 | shr eax, 9 |
||
835 | add ax, 1980 |
||
836 | shl eax, 16 ; year |
||
837 | and edx, 0x1F |
||
838 | mov al, dl ; day |
||
839 | shr ecx, 5 |
||
840 | and ecx, 0xF |
||
841 | mov ah, cl ; month |
||
842 | pop edx ecx |
||
843 | ret |
||
844 | |||
845 | fat_entry_to_bdfe: |
||
846 | ; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi |
||
847 | ; destroys eax |
||
848 | movzx eax, byte [edi+11] |
||
849 | mov [esi], eax ; attributes |
||
850 | mov eax, [ebp-4] |
||
851 | mov [esi+4], eax ; ASCII/UNICODE name |
||
852 | movzx eax, word [edi+14] |
||
853 | call fat_time_to_bdfe |
||
854 | mov [esi+8], eax ; creation time |
||
855 | movzx eax, word [edi+16] |
||
856 | call fat_date_to_bdfe |
||
857 | mov [esi+12], eax ; creation date |
||
858 | and dword [esi+16], 0 ; last access time is not supported on FAT |
||
859 | movzx eax, word [edi+18] |
||
860 | call fat_date_to_bdfe |
||
861 | mov [esi+20], eax ; last access date |
||
862 | movzx eax, word [edi+22] |
||
863 | call fat_time_to_bdfe |
||
864 | mov [esi+24], eax ; last write time |
||
865 | movzx eax, word [edi+24] |
||
866 | call fat_date_to_bdfe |
||
867 | mov [esi+28], eax ; last write date |
||
868 | mov eax, [edi+28] |
||
869 | mov [esi+32], eax ; file size (low dword) |
||
870 | xor eax, eax |
||
871 | mov [esi+36], eax ; file size (high dword) |
||
872 | push ecx edi |
||
873 | lea edi, [esi+40] |
||
874 | mov esi, ebp |
||
875 | mov ecx, 259/2 |
||
876 | rep movsd |
||
877 | movsw |
||
878 | stosw |
||
879 | mov esi, edi |
||
880 | pop edi ecx |
||
881 | ret |
||
882 | |||
71 | diamond | 883 | rd_find_lfn: |
884 | ; in: esi->name |
||
885 | ; out: CF=1 - file not found |
||
886 | ; else CF=0 and edi->direntry |
||
887 | push esi ebp edi |
||
888 | sub esp, 262*2 ; allocate space for LFN |
||
889 | mov ebp, esp ; ebp points to buffer |
||
75 | diamond | 890 | push 0 ; for fat_get_name: read ASCII name |
71 | diamond | 891 | mov edi, 0x100000+512*19 ; to root dir |
892 | .l1: |
||
893 | call fat_get_name |
||
894 | jc .l2 |
||
895 | call fat_compare_name |
||
896 | jz .found |
||
897 | .l2: |
||
898 | add edi, 0x20 |
||
899 | cmp edi, 0x100000+512*33 |
||
900 | jb .l1 |
||
901 | .notfound: |
||
75 | diamond | 902 | add esp, 262*2+4 |
71 | diamond | 903 | pop edi ebp esi |
904 | stc |
||
905 | ret |
||
906 | .found: |
||
907 | ; found |
||
908 | ; if this is LFN entry, advance to true entry |
||
909 | cmp byte [edi+11], 0xF |
||
910 | jnz @f |
||
911 | add edi, 0x20 |
||
912 | @@: |
||
913 | ; folders are not supported |
||
914 | cmp byte [esi], 0 |
||
915 | jnz .notfound |
||
75 | diamond | 916 | add esp, 262*2+4+4 ; CF=0 |
71 | diamond | 917 | pop ebp esi |
918 | ret |
||
919 | |||
920 | ;---------------------------------------------------------------- |
||
921 | ; |
||
922 | ; fs_RamdiskRead - LFN variant for reading sys floppy |
||
923 | ; |
||
924 | ; esi points to filename |
||
925 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
926 | ; may be ebx=0 - start from first byte |
||
927 | ; ecx number of bytes to read, 0+ |
||
928 | ; edx mem location to return data |
||
929 | ; |
||
930 | ; ret ebx = size or 0xffffffff file not found |
||
931 | ; eax = 0 ok read or other = errormsg |
||
932 | ; |
||
933 | ;-------------------------------------------------------------- |
||
934 | fs_RamdiskRead: |
||
75 | diamond | 935 | cmp byte [esi], 0 |
936 | jnz @f |
||
937 | or ebx, -1 |
||
938 | mov eax, 10 ; access denied |
||
939 | ret |
||
71 | diamond | 940 | @@: |
75 | diamond | 941 | push edi |
942 | call rd_find_lfn |
||
943 | jnc .found |
||
944 | pop edi |
||
945 | or ebx, -1 |
||
946 | mov eax, 5 ; file not found |
||
947 | ret |
||
71 | diamond | 948 | .found: |
75 | diamond | 949 | test ebx, ebx |
950 | jz .l1 |
||
951 | cmp dword [ebx+4], 0 |
||
952 | jz @f |
||
953 | mov ebx, [edi+28] |
||
71 | diamond | 954 | .reteof: |
75 | diamond | 955 | mov eax, 6 ; EOF |
956 | pop edi |
||
957 | ret |
||
71 | diamond | 958 | @@: |
75 | diamond | 959 | mov ebx, [ebx] |
71 | diamond | 960 | .l1: |
75 | diamond | 961 | push dword [edi+28] ; file size |
962 | push dword [edi+28] |
||
963 | movzx edi, word [edi+26] ; cluster |
||
964 | push ecx edx |
||
71 | diamond | 965 | .new: |
75 | diamond | 966 | jecxz .done |
967 | test edi, edi |
||
968 | jz .eof |
||
969 | cmp edi, 0xFF8 |
||
970 | jae .eof |
||
971 | lea eax, [edi+31] ; bootsector+2*fat+filenames |
||
972 | shl eax, 9 ; *512 |
||
973 | add eax, 0x100000 ; image base |
||
71 | diamond | 974 | ; now eax points to data of cluster |
75 | diamond | 975 | sub ebx, 512 |
976 | jae .skip |
||
977 | lea eax, [eax+ebx+512] |
||
978 | neg ebx |
||
979 | push ecx |
||
980 | cmp ecx, ebx |
||
981 | jbe @f |
||
982 | mov ecx, ebx |
||
71 | diamond | 983 | @@: |
75 | diamond | 984 | cmp ecx, [esp+12] |
985 | jbe @f |
||
986 | mov ecx, [esp+12] |
||
71 | diamond | 987 | @@: |
75 | diamond | 988 | mov ebx, edx |
989 | call memmove |
||
990 | add edx, ecx |
||
991 | sub [esp], ecx |
||
992 | sub [esp+12], ecx |
||
993 | pop ecx |
||
994 | xor ebx, ebx |
||
995 | cmp [esp+8], ebx |
||
996 | jnz .skip |
||
997 | jecxz .done |
||
998 | jmp .eof |
||
71 | diamond | 999 | .skip: |
75 | diamond | 1000 | movzx edi, word [edi*2+0x280000] ; find next cluster from FAT |
1001 | jmp .new |
||
71 | diamond | 1002 | .eof: |
75 | diamond | 1003 | pop edx ecx ebx ebx |
1004 | jmp .reteof |
||
71 | diamond | 1005 | .done: |
75 | diamond | 1006 | pop edx ecx ebx ebx edi |
1007 | xor eax, eax |
||
1008 | ret |
||
71 | diamond | 1009 | |
75 | diamond | 1010 | ;---------------------------------------------------------------- |
1011 | ; |
||
1012 | ; fs_RamdiskReadFolder - LFN variant for reading sys floppy folder |
||
1013 | ; |
||
1014 | ; esi points to filename; only root is folder on ramdisk |
||
1015 | ; ebx pointer to 32-bit number = first wanted block |
||
1016 | ; ecx number of blocks to read, 0+ |
||
1017 | ; edx mem location to return data |
||
1018 | ; |
||
1019 | ; ret ebx = size or 0xffffffff file not found |
||
1020 | ; eax = 0 ok read or other = errormsg |
||
1021 | ; |
||
1022 | ;-------------------------------------------------------------- |
||
1023 | fs_RamdiskReadFolder: |
||
1024 | mov ebx, [ebx] |
||
1025 | cmp byte [esi], 0 |
||
1026 | jz @f |
||
1027 | ; ramdisk doesn't support folders |
||
1028 | mov eax, ERROR_ACCESS_DENIED |
||
1029 | or ebx, -1 |
||
1030 | ret |
||
1031 | @@: |
||
1032 | push esi edi ecx |
||
1033 | ; init header |
||
1034 | push ecx |
||
1035 | mov edi, edx |
||
1036 | mov ecx, 32/4 |
||
1037 | xor eax, eax |
||
1038 | rep stosd |
||
1039 | mov byte [edx], 1 ; version |
||
1040 | pop ecx |
||
1041 | push ebp |
||
1042 | sub esp, 262*2 ; allocate space for LFN |
||
1043 | mov ebp, esp |
||
1044 | push 1 ; for fat_get_name: read UNICODE name |
||
1045 | ; read root |
||
1046 | mov esi, edi ; esi points to block of data of folder entry (BDFE) |
||
1047 | mov edi, 0x100000+512*19 |
||
1048 | .l1: |
||
1049 | call fat_get_name |
||
1050 | jc .l2 |
||
1051 | cmp byte [edi+11], 0xF |
||
1052 | jnz @f |
||
1053 | add edi, 0x20 |
||
1054 | @@: |
||
1055 | inc dword [edx+8] ; new file found |
||
1056 | dec ebx |
||
1057 | jns .l2 |
||
1058 | dec ecx |
||
1059 | js .l2 |
||
1060 | inc dword [edx+4] ; new file block copied |
||
1061 | call fat_entry_to_bdfe |
||
1062 | .l2: |
||
1063 | add edi, 0x20 |
||
1064 | cmp edi, 0x100000+512*33 |
||
1065 | jb .l1 |
||
1066 | add esp, 262*2+4 |
||
1067 | pop ebp |
||
1068 | mov ebx, [edx+8] |
||
1069 | xor eax, eax |
||
1070 | dec ecx |
||
1071 | js @f |
||
1072 | mov al, ERROR_END_OF_FILE |
||
1073 | @@: |
||
1074 | pop ecx edi esi |
||
1075 | ret |
||
1076 | |||
71 | diamond | 1077 | ; \end{diamond}->->-> |