minivmac4ios/libhfs/low.c

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2016-05-21 13:01:57 +00:00
/*
* libhfs - library for reading and writing Macintosh HFS volumes
* Copyright (C) 1996-1998 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.
*
* $Id: low.c,v 1.8 1998/11/02 22:09:03 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include <stdlib.h>
# include <string.h>
# include <errno.h>
# include "libhfs.h"
# include "low.h"
# include "data.h"
# include "block.h"
# include "file.h"
/*
* NAME: low->getddr()
* DESCRIPTION: read a driver descriptor record
*/
int l_getddr(hfsvol *vol, Block0 *ddr)
{
block b;
const byte *ptr = b;
int i;
if (b_readpb(vol, 0, &b, 1) == -1)
goto fail;
d_fetchsw(&ptr, &ddr->sbSig);
d_fetchsw(&ptr, &ddr->sbBlkSize);
d_fetchsl(&ptr, &ddr->sbBlkCount);
d_fetchsw(&ptr, &ddr->sbDevType);
d_fetchsw(&ptr, &ddr->sbDevId);
d_fetchsl(&ptr, &ddr->sbData);
d_fetchsw(&ptr, &ddr->sbDrvrCount);
d_fetchsl(&ptr, &ddr->ddBlock);
d_fetchsw(&ptr, &ddr->ddSize);
d_fetchsw(&ptr, &ddr->ddType);
for (i = 0; i < 243; ++i)
d_fetchsw(&ptr, &ddr->ddPad[i]);
ASSERT(ptr - b == HFS_BLOCKSZ);
return 0;
fail:
return -1;
}
/*
* NAME: low->putddr()
* DESCRIPTION: write a driver descriptor record
*/
int l_putddr(hfsvol *vol, const Block0 *ddr)
{
block b;
byte *ptr = b;
int i;
d_storesw(&ptr, ddr->sbSig);
d_storesw(&ptr, ddr->sbBlkSize);
d_storesl(&ptr, ddr->sbBlkCount);
d_storesw(&ptr, ddr->sbDevType);
d_storesw(&ptr, ddr->sbDevId);
d_storesl(&ptr, ddr->sbData);
d_storesw(&ptr, ddr->sbDrvrCount);
d_storesl(&ptr, ddr->ddBlock);
d_storesw(&ptr, ddr->ddSize);
d_storesw(&ptr, ddr->ddType);
for (i = 0; i < 243; ++i)
d_storesw(&ptr, ddr->ddPad[i]);
ASSERT(ptr - b == HFS_BLOCKSZ);
if (b_writepb(vol, 0, &b, 1) == -1)
goto fail;
return 0;
fail:
return -1;
}
/*
* NAME: low->getpmentry()
* DESCRIPTION: read a partition map entry
*/
int l_getpmentry(hfsvol *vol, Partition *map, unsigned long bnum)
{
block b;
const byte *ptr = b;
int i;
if (b_readpb(vol, bnum, &b, 1) == -1)
goto fail;
d_fetchsw(&ptr, &map->pmSig);
d_fetchsw(&ptr, &map->pmSigPad);
d_fetchsl(&ptr, &map->pmMapBlkCnt);
d_fetchsl(&ptr, &map->pmPyPartStart);
d_fetchsl(&ptr, &map->pmPartBlkCnt);
strncpy((char *) map->pmPartName, (const char *) ptr, 32);
map->pmPartName[32] = 0;
ptr += 32;
strncpy((char *) map->pmParType, (const char *) ptr, 32);
map->pmParType[32] = 0;
ptr += 32;
d_fetchsl(&ptr, &map->pmLgDataStart);
d_fetchsl(&ptr, &map->pmDataCnt);
d_fetchsl(&ptr, &map->pmPartStatus);
d_fetchsl(&ptr, &map->pmLgBootStart);
d_fetchsl(&ptr, &map->pmBootSize);
d_fetchsl(&ptr, &map->pmBootAddr);
d_fetchsl(&ptr, &map->pmBootAddr2);
d_fetchsl(&ptr, &map->pmBootEntry);
d_fetchsl(&ptr, &map->pmBootEntry2);
d_fetchsl(&ptr, &map->pmBootCksum);
strncpy((char *) map->pmProcessor, (const char *) ptr, 16);
map->pmProcessor[16] = 0;
ptr += 16;
for (i = 0; i < 188; ++i)
d_fetchsw(&ptr, &map->pmPad[i]);
ASSERT(ptr - b == HFS_BLOCKSZ);
return 0;
fail:
return -1;
}
/*
* NAME: low->putpmentry()
* DESCRIPTION: write a partition map entry
*/
int l_putpmentry(hfsvol *vol, const Partition *map, unsigned long bnum)
{
block b;
byte *ptr = b;
int i;
d_storesw(&ptr, map->pmSig);
d_storesw(&ptr, map->pmSigPad);
d_storesl(&ptr, map->pmMapBlkCnt);
d_storesl(&ptr, map->pmPyPartStart);
d_storesl(&ptr, map->pmPartBlkCnt);
memset(ptr, 0, 32);
strncpy((char *) ptr, (const char *) map->pmPartName, 32);
ptr += 32;
memset(ptr, 0, 32);
strncpy((char *) ptr, (const char *) map->pmParType, 32);
ptr += 32;
d_storesl(&ptr, map->pmLgDataStart);
d_storesl(&ptr, map->pmDataCnt);
d_storesl(&ptr, map->pmPartStatus);
d_storesl(&ptr, map->pmLgBootStart);
d_storesl(&ptr, map->pmBootSize);
d_storesl(&ptr, map->pmBootAddr);
d_storesl(&ptr, map->pmBootAddr2);
d_storesl(&ptr, map->pmBootEntry);
d_storesl(&ptr, map->pmBootEntry2);
d_storesl(&ptr, map->pmBootCksum);
memset(ptr, 0, 16);
strncpy((char *) ptr, (const char *) map->pmProcessor, 16);
ptr += 16;
for (i = 0; i < 188; ++i)
d_storesw(&ptr, map->pmPad[i]);
ASSERT(ptr - b == HFS_BLOCKSZ);
if (b_writepb(vol, bnum, &b, 1) == -1)
goto fail;
return 0;
fail:
return -1;
}
/*
* NAME: low->getbb()
* DESCRIPTION: read a volume's boot blocks
*/
int l_getbb(hfsvol *vol, BootBlkHdr *bb, byte *bootcode)
{
block b;
const byte *ptr = b;
if (b_readlb(vol, 0, &b) == -1)
goto fail;
d_fetchsw(&ptr, &bb->bbID);
d_fetchsl(&ptr, &bb->bbEntry);
d_fetchsw(&ptr, &bb->bbVersion);
d_fetchsw(&ptr, &bb->bbPageFlags);
d_fetchstr(&ptr, bb->bbSysName, sizeof(bb->bbSysName));
d_fetchstr(&ptr, bb->bbShellName, sizeof(bb->bbShellName));
d_fetchstr(&ptr, bb->bbDbg1Name, sizeof(bb->bbDbg1Name));
d_fetchstr(&ptr, bb->bbDbg2Name, sizeof(bb->bbDbg2Name));
d_fetchstr(&ptr, bb->bbScreenName, sizeof(bb->bbScreenName));
d_fetchstr(&ptr, bb->bbHelloName, sizeof(bb->bbHelloName));
d_fetchstr(&ptr, bb->bbScrapName, sizeof(bb->bbScrapName));
d_fetchsw(&ptr, &bb->bbCntFCBs);
d_fetchsw(&ptr, &bb->bbCntEvts);
d_fetchsl(&ptr, &bb->bb128KSHeap);
d_fetchsl(&ptr, &bb->bb256KSHeap);
d_fetchsl(&ptr, &bb->bbSysHeapSize);
d_fetchsw(&ptr, &bb->filler);
d_fetchsl(&ptr, &bb->bbSysHeapExtra);
d_fetchsl(&ptr, &bb->bbSysHeapFract);
ASSERT(ptr - b == 148);
if (bootcode)
{
memcpy(bootcode, ptr, HFS_BOOTCODE1LEN);
if (b_readlb(vol, 1, &b) == -1)
goto fail;
memcpy(bootcode + HFS_BOOTCODE1LEN, b, HFS_BOOTCODE2LEN);
}
return 0;
fail:
return -1;
}
/*
* NAME: low->putbb()
* DESCRIPTION: write a volume's boot blocks
*/
int l_putbb(hfsvol *vol, const BootBlkHdr *bb, const byte *bootcode)
{
block b;
byte *ptr = b;
d_storesw(&ptr, bb->bbID);
d_storesl(&ptr, bb->bbEntry);
d_storesw(&ptr, bb->bbVersion);
d_storesw(&ptr, bb->bbPageFlags);
d_storestr(&ptr, bb->bbSysName, sizeof(bb->bbSysName));
d_storestr(&ptr, bb->bbShellName, sizeof(bb->bbShellName));
d_storestr(&ptr, bb->bbDbg1Name, sizeof(bb->bbDbg1Name));
d_storestr(&ptr, bb->bbDbg2Name, sizeof(bb->bbDbg2Name));
d_storestr(&ptr, bb->bbScreenName, sizeof(bb->bbScreenName));
d_storestr(&ptr, bb->bbHelloName, sizeof(bb->bbHelloName));
d_storestr(&ptr, bb->bbScrapName, sizeof(bb->bbScrapName));
d_storesw(&ptr, bb->bbCntFCBs);
d_storesw(&ptr, bb->bbCntEvts);
d_storesl(&ptr, bb->bb128KSHeap);
d_storesl(&ptr, bb->bb256KSHeap);
d_storesl(&ptr, bb->bbSysHeapSize);
d_storesw(&ptr, bb->filler);
d_storesl(&ptr, bb->bbSysHeapExtra);
d_storesl(&ptr, bb->bbSysHeapFract);
ASSERT(ptr - b == 148);
if (bootcode)
memcpy(ptr, bootcode, HFS_BOOTCODE1LEN);
else
memset(ptr, 0, HFS_BOOTCODE1LEN);
if (b_writelb(vol, 0, &b) == -1)
goto fail;
if (bootcode)
memcpy(&b, bootcode + HFS_BOOTCODE1LEN, HFS_BOOTCODE2LEN);
else
memset(&b, 0, HFS_BOOTCODE2LEN);
if (b_writelb(vol, 1, &b) == -1)
goto fail;
return 0;
fail:
return -1;
}
/*
* NAME: low->getmdb()
* DESCRIPTION: read a master directory block
*/
int l_getmdb(hfsvol *vol, MDB *mdb, int backup)
{
block b;
const byte *ptr = b;
int i;
if (b_readlb(vol, backup ? vol->vlen - 2 : 2, &b) == -1)
goto fail;
d_fetchsw(&ptr, &mdb->drSigWord);
d_fetchsl(&ptr, &mdb->drCrDate);
d_fetchsl(&ptr, &mdb->drLsMod);
d_fetchsw(&ptr, &mdb->drAtrb);
d_fetchuw(&ptr, &mdb->drNmFls);
d_fetchuw(&ptr, &mdb->drVBMSt);
d_fetchuw(&ptr, &mdb->drAllocPtr);
d_fetchuw(&ptr, &mdb->drNmAlBlks);
d_fetchul(&ptr, &mdb->drAlBlkSiz);
d_fetchul(&ptr, &mdb->drClpSiz);
d_fetchuw(&ptr, &mdb->drAlBlSt);
d_fetchsl(&ptr, &mdb->drNxtCNID);
d_fetchuw(&ptr, &mdb->drFreeBks);
d_fetchstr(&ptr, mdb->drVN, sizeof(mdb->drVN));
ASSERT(ptr - b == 64);
d_fetchsl(&ptr, &mdb->drVolBkUp);
d_fetchsw(&ptr, &mdb->drVSeqNum);
d_fetchul(&ptr, &mdb->drWrCnt);
d_fetchul(&ptr, &mdb->drXTClpSiz);
d_fetchul(&ptr, &mdb->drCTClpSiz);
d_fetchuw(&ptr, &mdb->drNmRtDirs);
d_fetchul(&ptr, &mdb->drFilCnt);
d_fetchul(&ptr, &mdb->drDirCnt);
for (i = 0; i < 8; ++i)
d_fetchsl(&ptr, &mdb->drFndrInfo[i]);
ASSERT(ptr - b == 124);
d_fetchuw(&ptr, &mdb->drEmbedSigWord);
d_fetchuw(&ptr, &mdb->drEmbedExtent.xdrStABN);
d_fetchuw(&ptr, &mdb->drEmbedExtent.xdrNumABlks);
d_fetchul(&ptr, &mdb->drXTFlSize);
for (i = 0; i < 3; ++i)
{
d_fetchuw(&ptr, &mdb->drXTExtRec[i].xdrStABN);
d_fetchuw(&ptr, &mdb->drXTExtRec[i].xdrNumABlks);
}
ASSERT(ptr - b == 146);
d_fetchul(&ptr, &mdb->drCTFlSize);
for (i = 0; i < 3; ++i)
{
d_fetchuw(&ptr, &mdb->drCTExtRec[i].xdrStABN);
d_fetchuw(&ptr, &mdb->drCTExtRec[i].xdrNumABlks);
}
ASSERT(ptr - b == 162);
return 0;
fail:
return -1;
}
/*
* NAME: low->putmdb()
* DESCRIPTION: write master directory block(s)
*/
int l_putmdb(hfsvol *vol, const MDB *mdb, int backup)
{
block b;
byte *ptr = b;
int i;
d_storesw(&ptr, mdb->drSigWord);
d_storesl(&ptr, mdb->drCrDate);
d_storesl(&ptr, mdb->drLsMod);
d_storesw(&ptr, mdb->drAtrb);
d_storeuw(&ptr, mdb->drNmFls);
d_storeuw(&ptr, mdb->drVBMSt);
d_storeuw(&ptr, mdb->drAllocPtr);
d_storeuw(&ptr, mdb->drNmAlBlks);
d_storeul(&ptr, mdb->drAlBlkSiz);
d_storeul(&ptr, mdb->drClpSiz);
d_storeuw(&ptr, mdb->drAlBlSt);
d_storesl(&ptr, mdb->drNxtCNID);
d_storeuw(&ptr, mdb->drFreeBks);
d_storestr(&ptr, mdb->drVN, sizeof(mdb->drVN));
ASSERT(ptr - b == 64);
d_storesl(&ptr, mdb->drVolBkUp);
d_storesw(&ptr, mdb->drVSeqNum);
d_storeul(&ptr, mdb->drWrCnt);
d_storeul(&ptr, mdb->drXTClpSiz);
d_storeul(&ptr, mdb->drCTClpSiz);
d_storeuw(&ptr, mdb->drNmRtDirs);
d_storeul(&ptr, mdb->drFilCnt);
d_storeul(&ptr, mdb->drDirCnt);
for (i = 0; i < 8; ++i)
d_storesl(&ptr, mdb->drFndrInfo[i]);
ASSERT(ptr - b == 124);
d_storeuw(&ptr, mdb->drEmbedSigWord);
d_storeuw(&ptr, mdb->drEmbedExtent.xdrStABN);
d_storeuw(&ptr, mdb->drEmbedExtent.xdrNumABlks);
d_storeul(&ptr, mdb->drXTFlSize);
for (i = 0; i < 3; ++i)
{
d_storeuw(&ptr, mdb->drXTExtRec[i].xdrStABN);
d_storeuw(&ptr, mdb->drXTExtRec[i].xdrNumABlks);
}
ASSERT(ptr - b == 146);
d_storeul(&ptr, mdb->drCTFlSize);
for (i = 0; i < 3; ++i)
{
d_storeuw(&ptr, mdb->drCTExtRec[i].xdrStABN);
d_storeuw(&ptr, mdb->drCTExtRec[i].xdrNumABlks);
}
ASSERT(ptr - b == 162);
memset(ptr, 0, HFS_BLOCKSZ - (ptr - b));
if (b_writelb(vol, 2, &b) == -1 ||
(backup && b_writelb(vol, vol->vlen - 2, &b) == -1))
goto fail;
return 0;
fail:
return -1;
}