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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)block.c 1.3 01/11/01 joerg */
/*
* hfsutils - tools for reading and writing Macintosh HFS volumes
* Copyright (C) 1996, 1997 Robert Leslie
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h>
#include <strdefs.h>
#include <unixstd.h>
#include <errno.h>
#include "internal.h"
#include "data.h"
#include "block.h"
#include "low.h"
#ifdef DEBUG
#include <stdio.h>
#endif /* DEBUG */
/*
* NAME: block->readlb()
* DESCRIPTION: read a logical block from a volume
*/
int b_readlb(hfsvol *vol, unsigned long num, block *bp)
{
#ifndef APPLE_HYB
int bytes;
#endif
#ifdef APPLE_HYB
block *b;
hce_mem *hce;
#ifdef DEBUG
fprintf(stderr,"b_readlb: start block = %d\n", vol->vstart + num);
#endif /* DEBUG */
hce = vol->hce;
/* Check to see if requested block is in the HFS header or catalog/exents
files. If it is, read info from memory copy. If not, then something
has gone horribly wrong ... */
if (num < hce->hfs_hdr_size)
b = (block *)hce->hfs_hdr + num;
else if (num < hce->hfs_hdr_size + hce->hfs_ce_size)
b = (block *)hce->hfs_ce + num - hce->hfs_hdr_size;
else
{
ERROR(EIO, "should not happen!");
return -1;
}
memcpy(bp, b, HFS_BLOCKSZ);
#else
if (lseek(vol->fd, (vol->vstart + num) * HFS_BLOCKSZ, SEEK_SET) < 0)
{
ERROR(errno, "error seeking device");
return -1;
}
bytes = read(vol->fd, bp, HFS_BLOCKSZ);
if (bytes < 0)
{
ERROR(errno, "error reading from device");
return -1;
}
else if (bytes == 0)
{
ERROR(EIO, "read EOF on volume");
return -1;
}
else if (bytes != HFS_BLOCKSZ)
{
ERROR(EIO, "read incomplete block");
return -1;
}
#endif /* APPLE_HYB */
return 0;
}
/*
* NAME: block->writelb()
* DESCRIPTION: write a logical block to a volume
*/
int b_writelb(hfsvol *vol, unsigned long num, block *bp)
{
#ifndef APPLE_HYB
int bytes;
#endif
#ifdef APPLE_HYB
block *b;
hce_mem *hce;
#ifdef DEBUG
fprintf(stderr,"b_writelb: start block = %d\n", vol->vstart + num);
#endif /* DEBUG */
hce = vol->hce;
/* Check to see if requested block is in the HFS header or catalog/exents
files. If it is, write info to memory copy. If not, then it's a block
for an ordinary file - and as we are writing the files later, then just
ignore and return OK */
if (num < hce->hfs_hdr_size)
b = (block *)hce->hfs_hdr + num;
else if (num < hce->hfs_hdr_size + hce->hfs_ce_size)
b = (block *)hce->hfs_ce + num - hce->hfs_hdr_size;
else
{
#ifdef DEBUG
fprintf(stderr,"b_writelb: ignoring\n");
#endif /* DEBUG */
return 0;
}
memcpy(b, bp, HFS_BLOCKSZ);
#else
if (lseek(vol->fd, (vol->vstart + num) * HFS_BLOCKSZ, SEEK_SET) < 0)
{
ERROR(errno, "error seeking device");
return -1;
}
bytes = write(vol->fd, bp, HFS_BLOCKSZ);
if (bytes < 0)
{
ERROR(errno, "error writing to device");
return -1;
}
else if (bytes != HFS_BLOCKSZ)
{
ERROR(EIO, "wrote incomplete block");
return -1;
}
#endif /* APPLE_HYB */
return 0;
}
/*
* NAME: block->readab()
* DESCRIPTION: read a block from an allocation block from a volume
*/
int b_readab(hfsvol *vol, unsigned int anum, unsigned int idx, block *bp)
{
/* verify the allocation block exists and is marked as in-use */
if (anum >= vol->mdb.drNmAlBlks)
{
ERROR(EIO, "read nonexistent block");
return -1;
}
else if (vol->vbm && ! BMTST(vol->vbm, anum))
{
ERROR(EIO, "read unallocated block");
return -1;
}
return b_readlb(vol, vol->mdb.drAlBlSt + anum * vol->lpa + idx, bp);
}
/*
* NAME: b->writeab()
* DESCRIPTION: write a block to an allocation block to a volume
*/
int b_writeab(hfsvol *vol, unsigned int anum, unsigned int idx, block *bp)
{
/* verify the allocation block exists and is marked as in-use */
if (anum >= vol->mdb.drNmAlBlks)
{
ERROR(EIO, "write nonexistent block");
return -1;
}
else if (vol->vbm && ! BMTST(vol->vbm, anum))
{
ERROR(EIO, "write unallocated block");
return -1;
}
vol->mdb.drAtrb &= ~HFS_ATRB_UMOUNTED;
vol->mdb.drLsMod = d_tomtime(time(0));
++vol->mdb.drWrCnt;
vol->flags |= HFS_UPDATE_MDB;
return b_writelb(vol, vol->mdb.drAlBlSt + anum * vol->lpa + idx, bp);
}
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