CHNOSProject/chnos/tolset_chn_000/chnos_008/chnos/file.c

   1 \r
   2 #include "core.h"\r
   3 \r
   4 void decode_fat(ushort *fat, bool backup)\r
   5 {\r
   6         int i, j = 0;\r
   7         uchar *img;\r
   8 \r
   9         if(backup)      img = (uchar *)ADR_DISKIMG + 0x00001400;\r
  10         else            img = (uchar *)ADR_DISKIMG + 0x00000200;\r
  11 \r
  12         for(i = 0; i < 2880; i += 2){\r
  13                 fat[i + 0] = (img[j + 0]        | img[j + 1] << 8) & 0xfff;\r
  14                 fat[i + 1] = (img[j + 1] >> 4   | img[j + 2] << 4) & 0xfff;\r
  15                 j += 3;\r
  16         }\r
  17         return;\r
  18 }\r
  19 \r
  20 void load_file(uint finfo_no, uchar *buf)\r
  21 {\r
  22         int i;\r
  23         uchar *img;\r
  24         uint size;\r
  25         ushort clustno;\r
  26 \r
  27         if(finfo_no > 224) return;\r
  28 \r
  29         img = (uchar *)ADR_DISKIMG + 0x00003e00;\r
  30         size = system.io.file.list[finfo_no].size;\r
  31         clustno = system.io.file.list[finfo_no].clustno;\r
  32 \r
  33 \r
  34         for(;;){\r
  35                 if(size <= 512){\r
  36                         for(i = 0; i < size; i++){\r
  37                                 buf[i] = img[clustno * 512 + i];\r
  38                         }\r
  39                         break;\r
  40                 }\r
  41                 for(i = 0; i < 512; i++){\r
  42                         buf[i] = img[clustno * 512 + i];\r
  43                 }\r
  44                 size -= 512;\r
  45                 buf += 512;\r
  46                 clustno = system.io.file.fat[clustno];\r
  47                 \r
  48         }\r
  49 }\r
  50 \r
  51 uint search_file(char *name)\r
  52 {\r
  53         int i, j;\r
  54         uchar s[12];\r
  55 \r
  56         for(j = 0; j < 11; j++){\r
  57                 s[j] = ' ';\r
  58         }\r
  59         j = 0;\r
  60         for(i = 0; j < 11 && name[i] != 0x00; i++){\r
  61                 if(name[i] == '.' && j <= 8){\r
  62                         j = 8;\r
  63                 } else{\r
  64                         s[j] = name[i];\r
  65                         if('a' <= s[j] && s[j] <= 'z'){\r
  66                                 s[j] -= 0x20;\r
  67                         }\r
  68                         j++;\r
  69                 }\r
  70         }\r
  71         for(i = 0; i < 224; ){\r
  72                 if(system.io.file.list[i].name[0] == 0x00) break;\r
  73                 if((system.io.file.list[i].type & 0x18) == 0){\r
  74                         for(j = 0; j < 11; j++){\r
  75                                 if(system.io.file.list[i].name[j] != s[j]) goto next_file;\r
  76                         }\r
  77                         break; \r
  78                 }\r
  79 next_file:\r
  80                 i++;\r
  81         }\r
  82         if(i < 224 && system.io.file.list[i].name[0] != 0x00){\r
  83                 return i;\r
  84         } else {\r
  85                 return 0xFFFFFFFF;\r
  86         }\r
  87 }\r