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/*
* Creation Date: <2001/05/06 22:27:09 samuel>
* Time-stamp: <2003/12/12 02:24:56 samuel>
*
* <fs.c>
*
* I/O API used by the filesystem code
*
* Copyright (C) 2001, 2002, 2003 Samuel Rydh (samuel@ibrium.se)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation
*
*/
#include "config.h"
#include "libopenbios/bindings.h"
#include "fs/fs.h"
#include "libc/diskio.h"
#include "os.h"
#include "hfs_mdb.h"
/************************************************************************/
/* functionsions used by the various filesystems */
/************************************************************************/
char *
get_hfs_vol_name( int fd, char *buf, int size )
{
char sect[512];
hfs_mdb_t *mdb = (hfs_mdb_t*)§
seek_io( fd, 0x400 );
read_io( fd, sect, sizeof(sect) );
if( hfs_get_ushort(mdb->drSigWord) == HFS_SIGNATURE ) {
unsigned int n = mdb->drVN[0];
if( n >= size )
n = size - 1;
memcpy( buf, &mdb->drVN[1], n );
buf[n] = 0;
} else if( hfs_get_ushort(mdb->drSigWord) == HFS_PLUS_SIGNATURE ) {
strncpy( buf, "Unembedded HFS+", size );
} else {
strncpy( buf, "Error", size );
}
return buf;
}
unsigned long
os_read( int fd, void *buf, unsigned long len, int blksize_bits )
{
/* printk("os_read %d\n", (int)len); */
int cnt = read_io( fd, buf, len << blksize_bits );
return (cnt > 0)? (cnt >> blksize_bits) : cnt;
}
unsigned long
os_seek( int fd, unsigned long blknum, int blksize_bits )
{
/* printk("os_seek %d\n", blknum ); */
long long offs = (long long)blknum << blksize_bits;
/* offset == -1 means seek to EOF */
if( (int)blknum == -1 )
offs = -1;
if( seek_io(fd, offs) ) {
/* printk("os_seek failure\n"); */
return (unsigned long)-1;
}
if( (int)blknum == -1 ) {
if( (offs=tell(fd)) < 0 )
return -1;
blknum = offs >> blksize_bits;
}
return blknum;
}
void
os_seek_offset( int fd, long long offset )
{
seek_io(fd, offset);
}
int
os_same( int fd1, int fd2 )
{
return fd1 == fd2;
}
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