source: xtideuniversalbios/trunk/Serial_Server/library/File.h@ 219

Last change on this file since 219 was 219, checked in by gregli@…, 13 years ago

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

File size: 2.2 KB
Line 
1//======================================================================
2//
3// Project: XTIDE Universal BIOS, Serial Port Server
4//
5// File: file.h - File access via standard "stdio.h" routines
6//
7// Routines for accessing the file system using generic routines, which
8// should work on all systems. The issue with using these is that
9// ftell() and fseek() are limited to 2 GB files (signed 32-bit quantities)
10// and there is no standard for 64-bit quantities. So, look for a
11// OS specific version of this file in the distribution, such as
12// win32/win32file.h which may be in use instead.
13//
14
15#include <stdio.h>
16
17class FileAccess
18{
19public:
20 void Create( char *p_name )
21 {
22 fp = fopen( p_name, "r" );
23
24 if( fp )
25 log( -1, "Create Failure: '%s' already exists", p_name );
26
27 if( !(fp = fopen( p_name, "w" )) )
28 log( -1, "Could not create file '%s'", p_name );
29
30 name = p_name;
31 }
32
33 void Open( char *p_name )
34 {
35 fp = fopen( p_name, "r+" );
36 if( !fp )
37 log( -1, "Could not Open '%s'", p_name );
38 name = p_name;
39 }
40
41 void Close()
42 {
43 if( fp )
44 fclose( fp );
45 fp = NULL;
46 }
47
48 unsigned long SizeSectors(void)
49 {
50 long filesize;
51
52 fseek( fp, 0, SEEK_END );
53 filesize = ftell( fp );
54
55 if( filesize == 0 || filesize == -1L )
56 log( -1, "Could not get file size for '%s', file possibly larger than 2 GB", name );
57
58 if( filesize & 0x1ff )
59 log( -1, "'%s' not made up of 512 byte sectors", name );
60
61 return( filesize >> 9 ); // 512 bytes per sector
62 }
63
64 void SeekSectors( unsigned long lba )
65 {
66 if( fseek( fp, lba * 512, SEEK_SET ) )
67 log( -1, "'%s', Failed to seek to lba=%lu", name, lba );
68 }
69
70 void Read( void *buff, unsigned long len )
71 {
72 if( fread( buff, 1, 512, fp ) != 512 )
73 log( -1, "'%s', Failed to read sector", name );
74 }
75
76 void Write( void *buff, unsigned long len )
77 {
78 if( fwrite( buff, 1, 512, fp ) != 512 )
79 log( -1, "'%s', Failed to write sector", name );
80 }
81
82 FileAccess()
83 {
84 fp = NULL;
85 name = NULL;
86 }
87
88 const static unsigned long MaxSectors = 4194303; // limited by signed 32-bit file sizes
89#define USAGE_MAXSECTORS "2048 MB (signed 32-bit file size limit)"
90
91private:
92 FILE *fp;
93 char *name;
94};
95
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