1 | //====================================================================== |
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2 | // |
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3 | // Project: XTIDE Universal BIOS, Serial Port Server |
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4 | // |
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5 | // File: file.h - File access via standard "stdio.h" routines |
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6 | // |
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7 | // Routines for accessing the file system using generic routines, which |
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8 | // should work on all systems. The issue with using these is that |
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9 | // ftell() and fseek() are limited to 2 GB files (signed 32-bit quantities) |
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10 | // and there is no standard for 64-bit quantities. So, look for a |
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11 | // OS specific version of this file in the distribution, such as |
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12 | // win32/win32file.h which may be in use instead. |
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13 | // |
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14 | |
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15 | #include <stdio.h> |
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16 | |
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17 | class FileAccess |
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18 | { |
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19 | public: |
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20 | void Create( char *p_name ) |
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21 | { |
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22 | fp = fopen( p_name, "r" ); |
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23 | |
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24 | if( fp ) |
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25 | log( -1, "Create Failure: '%s' already exists", p_name ); |
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26 | |
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27 | if( !(fp = fopen( p_name, "w" )) ) |
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28 | log( -1, "Could not create file '%s'", p_name ); |
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29 | |
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30 | name = p_name; |
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31 | } |
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32 | |
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33 | void Open( char *p_name ) |
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34 | { |
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35 | fp = fopen( p_name, "r+" ); |
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36 | if( !fp ) |
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37 | log( -1, "Could not Open '%s'", p_name ); |
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38 | name = p_name; |
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39 | } |
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40 | |
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41 | void Close() |
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42 | { |
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43 | if( fp ) |
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44 | fclose( fp ); |
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45 | fp = NULL; |
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46 | } |
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47 | |
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48 | unsigned long SizeSectors(void) |
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49 | { |
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50 | long filesize; |
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51 | |
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52 | fseek( fp, 0, SEEK_END ); |
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53 | filesize = ftell( fp ); |
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54 | |
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55 | if( filesize == 0 || filesize == -1L ) |
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56 | log( -1, "Could not get file size for '%s', file possibly larger than 2 GB", name ); |
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57 | |
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58 | if( filesize & 0x1ff ) |
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59 | log( -1, "'%s' not made up of 512 byte sectors", name ); |
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60 | |
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61 | return( filesize >> 9 ); // 512 bytes per sector |
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62 | } |
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63 | |
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64 | void SeekSectors( unsigned long lba ) |
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65 | { |
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66 | if( fseek( fp, lba * 512, SEEK_SET ) ) |
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67 | log( -1, "'%s', Failed to seek to lba=%lu", name, lba ); |
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68 | } |
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69 | |
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70 | void Read( void *buff, unsigned long len ) |
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71 | { |
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72 | if( fread( buff, 1, 512, fp ) != 512 ) |
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73 | log( -1, "'%s', Failed to read sector", name ); |
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74 | } |
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75 | |
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76 | void Write( void *buff, unsigned long len ) |
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77 | { |
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78 | if( fwrite( buff, 1, 512, fp ) != 512 ) |
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79 | log( -1, "'%s', Failed to write sector", name ); |
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80 | } |
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81 | |
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82 | FileAccess() |
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83 | { |
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84 | fp = NULL; |
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85 | name = NULL; |
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86 | } |
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87 | |
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88 | const static unsigned long MaxSectors = 4194303; // limited by signed 32-bit file sizes |
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89 | #define USAGE_MAXSECTORS "2048 MB (signed 32-bit file size limit)" |
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90 | |
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91 | private: |
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92 | FILE *fp; |
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93 | char *name; |
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94 | }; |
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95 | |
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