source: xtideuniversalbios/trunk/Serial_Server/win32/Win32File.h @ 225

Last change on this file since 225 was 225, checked in by gregli@…, 11 years ago

Serial Server, minor improvements to file handling.

File size: 2.8 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    int Create( char *p_name )
21    {
22        fp = CreateFileA( p_name, GENERIC_WRITE, 0, 0, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, 0 );
23
24        if( fp == INVALID_HANDLE_VALUE )
25        {
26            if( GetLastError() == ERROR_FILE_EXISTS )
27            {
28                log( 0, "'%s', file already exists", p_name );
29                return( 0 );
30            }
31            else
32                log( -1, "'%s', could not create file", p_name );
33        }
34
35        name = p_name;
36
37        return( 1 );
38    }
39
40    void Open( char *p_name )
41    {
42        fp = CreateFileA( p_name, GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
43
44        if( fp == INVALID_HANDLE_VALUE )
45            log( -1, "'%s', could not open file", p_name );
46
47        name = p_name;
48    }
49
50    void Close()
51    {
52        if( fp )
53        {
54            if( !CloseHandle( fp ) )
55                log( 0, "'%s', could not close file handle", name ? name : "unknown" );         
56        }
57    }
58
59    unsigned long SizeSectors(void)
60    {
61        LARGE_INTEGER li;
62        unsigned long i;
63
64        if( !GetFileSizeEx( fp, &li ) )
65            log( -1, "'%s', could not retrieve file size (error %ul)", name, GetLastError() );
66
67        if( li.LowPart & 0x1ff )
68            log( -1, "'%s', file size is not a multiple of 512 byte sectors", name );
69
70        if( li.HighPart > 0x1f )
71            log( -1, "'%s', file size greater than LBA28 limit of 137,438,952,960 bytes", name );
72
73        i = ((li.HighPart << 23 ) & 0xff800000) | ((li.LowPart >> 9) & 0x7fffff);
74
75        return( (unsigned long) i );
76    }
77
78    void SeekSectors( unsigned long lba )
79    {
80        LARGE_INTEGER dist;
81
82        dist.HighPart = lba >> 23;
83        dist.LowPart = lba << 9;
84
85        if( !SetFilePointerEx( fp, dist, NULL, FILE_BEGIN ) )
86            log( -1, "'%s', Failed to seek to lba=%lu", name, lba );
87    }
88
89    void Read( void *buff, unsigned long len )
90    {
91        unsigned long out_len;
92
93        if( !ReadFile( fp, buff, len, &out_len, NULL ) || len != out_len )
94            log( -1, "'%s', ReadFile failed", name );
95    }
96
97    void Write( void *buff, unsigned long len )
98    {
99        unsigned long out_len;
100
101        if( !WriteFile( fp, buff, len, &out_len, NULL ) || len != out_len )
102            log( -1, "'%s', WriteFile failed", name );
103    }
104
105    FileAccess()
106    {
107        fp = NULL;
108        name = NULL;
109    }
110
111    // LBA 28 limit - 28-bits (could be 1 more, but not worth pushing it)
112    const static unsigned long MaxSectors = 0xfffffff; 
113#define USAGE_MAXSECTORS "137438 MB (LBA28 limit)"
114
115private:
116    HANDLE fp;
117    char *name;
118};
119
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