source: xtideuniversalbios/trunk/Serial_Server/win32/Win32File.h @ 219

Last change on this file since 219 was 219, checked in by gregli@…, 11 years ago

Serial Server, more minor improvements, added support for larger than 2 GB disks under Win32

File size: 2.6 KB
Line 
1//======================================================================
2//
3// Project:     XTIDE Universal BIOS, Serial Port Server
4//
5// File:        Win32File.h - Microsoft Windows file system access.
6//
7// Routines for accessing the file system under Win32.  It's important
8// to use these direct Win32 calls for large files, since FILE * routines,
9// in particular ftell() and fseek(), are limites to signed 32-bits (2 GB).
10// These are also likely faster since they are more direct.
11//
12
13#include <windows.h>
14#include <stdio.h>
15#include "../library/library.h"
16
17class FileAccess
18{
19public:
20    void Create( char *p_name )
21    {
22        fp = CreateFileA( p_name, GENERIC_WRITE, 0, 0, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, 0 );
23        if( !fp )
24            log( -1, "'%s', could not create file", p_name );
25        name = p_name;
26    }
27
28    void Open( char *p_name )
29    {
30        fp = CreateFileA( p_name, GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
31        if( !fp )
32            log( -1, "'%s', could not open file", p_name );
33        name = p_name;
34    }
35
36    void Close()
37    {
38        if( fp )
39        {
40            if( !CloseHandle( fp ) )
41                log( 0, "'%s', could not close file handle", name ? name : "unknown" );         
42        }
43    }
44
45    unsigned long SizeSectors(void)
46    {
47        LARGE_INTEGER li;
48        unsigned long i;
49
50        if( !GetFileSizeEx( fp, &li ) )
51            log( -1, "'%s', could not retrieve file size (error %ul)", name, GetLastError() );
52
53        if( li.LowPart & 0x1ff )
54            log( -1, "'%s', file size is not a multiple of 512 byte sectors", name );
55
56        if( li.HighPart > 0x1f )
57            log( -1, "'%s', file size greater than LBA28 limit of 137,438,952,960 bytes", name );
58
59        i = ((li.HighPart << 23 ) & 0xff800000) | ((li.LowPart >> 9) & 0x7fffff);
60
61        return( (unsigned long) i );
62    }
63
64    void SeekSectors( unsigned long lba )
65    {
66        LARGE_INTEGER dist;
67
68        dist.HighPart = lba >> 23;
69        dist.LowPart = lba << 9;
70
71        if( !SetFilePointerEx( fp, dist, NULL, FILE_BEGIN ) )
72            log( -1, "'%s', Failed to seek to lba=%lu", name, lba );
73    }
74
75    void Read( void *buff, unsigned long len )
76    {
77        unsigned long out_len;
78
79        if( !ReadFile( fp, buff, len, &out_len, NULL ) || len != out_len )
80            log( -1, "'%s', ReadFile failed" );
81    }
82
83    void Write( void *buff, unsigned long len )
84    {
85        unsigned long out_len;
86
87        if( !WriteFile( fp, buff, len, &out_len, NULL ) || len != out_len )
88            log( -1, "'%s', WriteFile failed" );
89    }
90
91    FileAccess()
92    {
93        fp = NULL;
94        name = NULL;
95    }
96
97    // LBA 28 limit - 28-bits (could be 1 more, but not worth pushing it)
98    const static unsigned long MaxSectors = 0xfffffff; 
99#define USAGE_MAXSECTORS "137438 MB (LBA28 limit)"
100
101private:
102    HANDLE fp;
103    char *name;
104};
105
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