[219] | 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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[225] | 20 | int Create( char *p_name ) |
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[219] | 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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[225] | 25 | { |
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| 26 | log( 0, "'%s' file already exists", p_name ); |
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| 27 | fclose( fp ); |
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| 28 | return( 0 ); |
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| 29 | } |
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[219] | 30 | |
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| 31 | if( !(fp = fopen( p_name, "w" )) ) |
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| 32 | log( -1, "Could not create file '%s'", p_name ); |
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| 33 | |
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| 34 | name = p_name; |
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[225] | 35 | |
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| 36 | return( 1 ); |
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[219] | 37 | } |
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| 38 | |
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| 39 | void Open( char *p_name ) |
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| 40 | { |
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| 41 | fp = fopen( p_name, "r+" ); |
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| 42 | if( !fp ) |
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| 43 | log( -1, "Could not Open '%s'", p_name ); |
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| 44 | name = p_name; |
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| 45 | } |
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| 46 | |
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| 47 | void Close() |
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| 48 | { |
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| 49 | if( fp ) |
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| 50 | fclose( fp ); |
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| 51 | fp = NULL; |
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| 52 | } |
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| 53 | |
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| 54 | unsigned long SizeSectors(void) |
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| 55 | { |
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| 56 | long filesize; |
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| 57 | |
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| 58 | fseek( fp, 0, SEEK_END ); |
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| 59 | filesize = ftell( fp ); |
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| 60 | |
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| 61 | if( filesize == 0 || filesize == -1L ) |
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| 62 | log( -1, "Could not get file size for '%s', file possibly larger than 2 GB", name ); |
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| 63 | |
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| 64 | if( filesize & 0x1ff ) |
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| 65 | log( -1, "'%s' not made up of 512 byte sectors", name ); |
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| 66 | |
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| 67 | return( filesize >> 9 ); // 512 bytes per sector |
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| 68 | } |
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| 69 | |
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| 70 | void SeekSectors( unsigned long lba ) |
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| 71 | { |
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| 72 | if( fseek( fp, lba * 512, SEEK_SET ) ) |
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| 73 | log( -1, "'%s', Failed to seek to lba=%lu", name, lba ); |
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| 74 | } |
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| 75 | |
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| 76 | void Read( void *buff, unsigned long len ) |
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| 77 | { |
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| 78 | if( fread( buff, 1, 512, fp ) != 512 ) |
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| 79 | log( -1, "'%s', Failed to read sector", name ); |
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| 80 | } |
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| 81 | |
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| 82 | void Write( void *buff, unsigned long len ) |
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| 83 | { |
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| 84 | if( fwrite( buff, 1, 512, fp ) != 512 ) |
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| 85 | log( -1, "'%s', Failed to write sector", name ); |
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| 86 | } |
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| 87 | |
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| 88 | FileAccess() |
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| 89 | { |
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| 90 | fp = NULL; |
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| 91 | name = NULL; |
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| 92 | } |
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| 93 | |
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| 94 | const static unsigned long MaxSectors = 4194303; // limited by signed 32-bit file sizes |
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| 95 | #define USAGE_MAXSECTORS "2048 MB (signed 32-bit file size limit)" |
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| 96 | |
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| 97 | private: |
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| 98 | FILE *fp; |
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| 99 | char *name; |
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| 100 | }; |
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| 101 | |
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