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Rev | Author | Line No. | Line |
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2783 | clevermous | 1 | fat32_parse_dir: |
2 | ; in: eax=directory cluster |
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3 | ; out: eax=entry cluster |
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4 | xor bx, bx |
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5 | mov di, bx |
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6 | push eax |
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7 | call read_cluster |
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8 | movzx cx, byte [7C0Dh] |
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9 | shl cx, 4 |
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10 | .scan_cluster: |
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11 | pop eax |
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12 | cmp byte [es:di], 0 |
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13 | jz file_not_found |
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14 | mov si, [esp+2] |
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15 | push eax |
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16 | call fat_compare_name |
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17 | jz .file_found |
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18 | and di, not 1Fh |
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19 | add di, 20h |
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20 | loop .scan_cluster |
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21 | pop eax |
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22 | call next_cluster |
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23 | jnc file_not_found |
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24 | jc fat32_parse_dir |
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25 | .file_found: |
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26 | pop eax |
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27 | mov si, [esp+2] |
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28 | mov [cur_obj], si |
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29 | and di, not 1Fh |
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30 | mov si, directory_string |
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31 | mov ax, [es:di+14h] |
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32 | and ax, 0xFFF |
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33 | shl eax, 10h |
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34 | mov ax, [es:di+1Ah] |
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35 | test eax, eax |
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36 | mov si, nodata_string |
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37 | jz find_error_si |
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38 | ret 2 |
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39 | |||
40 | fat_compare_name: |
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41 | push cx |
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42 | mov cx, 9 |
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43 | .scan: |
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44 | lodsb |
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45 | cmp al, '.' |
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46 | jz .ext |
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47 | cmp al, 0 |
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48 | jz .nameend |
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49 | cmp al, 'a' |
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50 | jb .notletter |
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51 | cmp al, 'z' |
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52 | ja .notletter |
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53 | or byte [es:di], 20h |
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54 | .notletter: |
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55 | scasb |
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56 | loopz .scan |
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57 | .notfound: |
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58 | inc cx ; to clear ZF flag |
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59 | pop cx |
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60 | ret |
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61 | .ext: |
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62 | mov al, ' ' |
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63 | dec cx |
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64 | repz scasb |
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65 | jnz .notfound |
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66 | test di, 1 |
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67 | jnz .notfound |
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68 | mov cx, 4 |
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69 | jmp .scan |
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70 | .nameend: |
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71 | mov al, ' ' |
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72 | dec cx |
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73 | repz scasb |
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74 | jnz .notfound |
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75 | test di, 1 |
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76 | jnz .file_found |
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77 | mov cx, 3 |
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78 | repz scasb |
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79 | jnz .notfound |
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80 | .file_found: |
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81 | xor cx, cx ; to set ZF flag |
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82 | pop cx |
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83 | ret |