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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