[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: Win32File.h - Microsoft Windows file system access. |
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| 6 | // |
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| 7 | // Routines for accessing the file system under Win32. It's important |
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| 8 | // to use these direct Win32 calls for large files, since FILE * routines, |
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| 9 | // in particular ftell() and fseek(), are limites to signed 32-bits (2 GB). |
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| 10 | // These are also likely faster since they are more direct. |
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| 11 | // |
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| 12 | |
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| 13 | #include <windows.h> |
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| 14 | #include <stdio.h> |
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| 15 | #include "../library/library.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 = CreateFileA( p_name, GENERIC_WRITE, 0, 0, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, 0 ); |
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| 23 | if( !fp ) |
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| 24 | log( -1, "'%s', could not create file", p_name ); |
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| 25 | name = p_name; |
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| 26 | } |
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| 27 | |
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| 28 | void Open( char *p_name ) |
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| 29 | { |
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| 30 | fp = CreateFileA( p_name, GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 ); |
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| 31 | if( !fp ) |
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| 32 | log( -1, "'%s', could not open file", p_name ); |
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| 33 | name = p_name; |
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| 34 | } |
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| 35 | |
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| 36 | void Close() |
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| 37 | { |
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| 38 | if( fp ) |
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| 39 | { |
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| 40 | if( !CloseHandle( fp ) ) |
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| 41 | log( 0, "'%s', could not close file handle", name ? name : "unknown" ); |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | unsigned long SizeSectors(void) |
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| 46 | { |
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| 47 | LARGE_INTEGER li; |
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| 48 | unsigned long i; |
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| 49 | |
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| 50 | if( !GetFileSizeEx( fp, &li ) ) |
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| 51 | log( -1, "'%s', could not retrieve file size (error %ul)", name, GetLastError() ); |
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| 52 | |
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| 53 | if( li.LowPart & 0x1ff ) |
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| 54 | log( -1, "'%s', file size is not a multiple of 512 byte sectors", name ); |
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| 55 | |
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| 56 | if( li.HighPart > 0x1f ) |
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| 57 | log( -1, "'%s', file size greater than LBA28 limit of 137,438,952,960 bytes", name ); |
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| 58 | |
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| 59 | i = ((li.HighPart << 23 ) & 0xff800000) | ((li.LowPart >> 9) & 0x7fffff); |
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| 60 | |
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| 61 | return( (unsigned long) i ); |
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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 | LARGE_INTEGER dist; |
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| 67 | |
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| 68 | dist.HighPart = lba >> 23; |
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| 69 | dist.LowPart = lba << 9; |
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| 70 | |
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| 71 | if( !SetFilePointerEx( fp, dist, NULL, FILE_BEGIN ) ) |
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| 72 | log( -1, "'%s', Failed to seek to lba=%lu", name, lba ); |
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| 73 | } |
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| 74 | |
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| 75 | void Read( void *buff, unsigned long len ) |
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| 76 | { |
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| 77 | unsigned long out_len; |
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| 78 | |
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| 79 | if( !ReadFile( fp, buff, len, &out_len, NULL ) || len != out_len ) |
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| 80 | log( -1, "'%s', ReadFile failed" ); |
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| 81 | } |
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| 82 | |
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| 83 | void Write( void *buff, unsigned long len ) |
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| 84 | { |
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| 85 | unsigned long out_len; |
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| 86 | |
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| 87 | if( !WriteFile( fp, buff, len, &out_len, NULL ) || len != out_len ) |
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| 88 | log( -1, "'%s', WriteFile failed" ); |
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| 89 | } |
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| 90 | |
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| 91 | FileAccess() |
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| 92 | { |
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| 93 | fp = NULL; |
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| 94 | name = NULL; |
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| 95 | } |
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| 96 | |
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| 97 | // LBA 28 limit - 28-bits (could be 1 more, but not worth pushing it) |
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| 98 | const static unsigned long MaxSectors = 0xfffffff; |
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| 99 | #define USAGE_MAXSECTORS "137438 MB (LBA28 limit)" |
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| 100 | |
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| 101 | private: |
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| 102 | HANDLE fp; |
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| 103 | char *name; |
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| 104 | }; |
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| 105 | |
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