record.c

创建一个符合iso-9660标准的iso文件系统

/*
 * 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 <stdxlib.h>
#include <strdefs.h>
#include <errno.h>

#include "internal.h"
#include "data.h"
#include "record.h"

/*
 * NAME:	record->packcatkey()
 * DESCRIPTION:	pack a catalog record key
 */
void r_packcatkey(key, pkey, len)
	CatKeyRec	*key;
	unsigned char	*pkey;
	int		*len;
{
  unsigned char *start = pkey;

  d_storeb(&pkey, key->ckrKeyLen);
  d_storeb(&pkey, key->ckrResrv1);
  d_storel(&pkey, key->ckrParID);
  d_stores(&pkey, key->ckrCName, sizeof(key->ckrCName));

  if (len)
    *len = HFS_RECKEYSKIP(start);
}

/*
 * NAME:	record->unpackcatkey()
 * DESCRIPTION:	unpack a catalog record key
 */
void r_unpackcatkey(pkey, key)
	unsigned char	*pkey;
	CatKeyRec	*key;
{
  d_fetchb(&pkey, (char *) &key->ckrKeyLen);
  d_fetchb(&pkey, (char *) &key->ckrResrv1);
  d_fetchl(&pkey, (long *) &key->ckrParID);
  d_fetchs(&pkey, key->ckrCName, sizeof(key->ckrCName));
}

/*
 * NAME:	record->packextkey()
 * DESCRIPTION:	pack an extents record key
 */
void r_packextkey(key, pkey, len)
	ExtKeyRec	*key;
	unsigned char	*pkey;
	int		*len;
{
  unsigned char *start = pkey;

  d_storeb(&pkey, key->xkrKeyLen);
  d_storeb(&pkey, key->xkrFkType);
  d_storel(&pkey, key->xkrFNum);
  d_storew(&pkey, key->xkrFABN);

  if (len)
    *len = HFS_RECKEYSKIP(start);
}

/*
 * NAME:	record->unpackextkey()
 * DESCRIPTION:	unpack an extents record key
 */
void r_unpackextkey(pkey, key)
	unsigned char	*pkey;
	ExtKeyRec	*key;
{
  d_fetchb(&pkey, (char *) &key->xkrKeyLen);
  d_fetchb(&pkey, (char *) &key->xkrFkType);
  d_fetchl(&pkey, (long *) &key->xkrFNum);
  d_fetchw(&pkey, (short *) &key->xkrFABN);
}

/*
 * NAME:	record->comparecatkeys()
 * DESCRIPTION:	compare two (packed) catalog record keys
 */
int r_comparecatkeys(pkey1, pkey2)
	unsigned char	*pkey1;
	unsigned char	*pkey2;
{
  CatKeyRec key1;
  CatKeyRec key2;
  int diff;

  r_unpackcatkey(pkey1, &key1);
  r_unpackcatkey(pkey2, &key2);

  diff = key1.ckrParID - key2.ckrParID;
  if (diff)
    return diff;

  return d_relstring(key1.ckrCName, key2.ckrCName);
}

/*
 * NAME:	record->compareextkeys()
 * DESCRIPTION:	compare two (packed) extents record keys
 */
int r_compareextkeys(pkey1, pkey2)
	unsigned char	*pkey1;
	unsigned char	*pkey2;
{
  ExtKeyRec key1;
  ExtKeyRec key2;
  int diff;

  r_unpackextkey(pkey1, &key1);
  r_unpackextkey(pkey2, &key2);

  diff = key1.xkrFNum - key2.xkrFNum;
  if (diff)
    return diff;

  diff = (unsigned char) key1.xkrFkType -
         (unsigned char) key2.xkrFkType;
  if (diff)
    return diff;

  return key1.xkrFABN - key2.xkrFABN;
}

/*
 * NAME:	record->packcatdata()
 * DESCRIPTION:	pack catalog record data
 */
void r_packcatdata(data, pdata, len)
	CatDataRec	*data;
	unsigned char	*pdata;
	int		*len;
{
  unsigned char *start = pdata;
  int i;

  d_storeb(&pdata, data->cdrType);
  d_storeb(&pdata, data->cdrResrv2);

  switch (data->cdrType)
    {
    case cdrDirRec:
      d_storew(&pdata, data->u.dir.dirFlags);
      d_storew(&pdata, data->u.dir.dirVal);
      d_storel(&pdata, data->u.dir.dirDirID);
      d_storel(&pdata, data->u.dir.dirCrDat);
      d_storel(&pdata, data->u.dir.dirMdDat);
      d_storel(&pdata, data->u.dir.dirBkDat);

      d_storew(&pdata, data->u.dir.dirUsrInfo.frRect.top);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frRect.left);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frRect.bottom);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frRect.right);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frFlags);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frLocation.v);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frLocation.h);
      d_storew(&pdata, data->u.dir.dirUsrInfo.frView);

      d_storew(&pdata, data->u.dir.dirFndrInfo.frScroll.v);
      d_storew(&pdata, data->u.dir.dirFndrInfo.frScroll.h);
      d_storel(&pdata, data->u.dir.dirFndrInfo.frOpenChain);
      d_storew(&pdata, data->u.dir.dirFndrInfo.frUnused);
      d_storew(&pdata, data->u.dir.dirFndrInfo.frComment);
      d_storel(&pdata, data->u.dir.dirFndrInfo.frPutAway);

      for (i = 0; i < 4; ++i)
	d_storel(&pdata, data->u.dir.dirResrv[i]);

      break;

    case cdrFilRec:
      d_storeb(&pdata, data->u.fil.filFlags);
      d_storeb(&pdata, data->u.fil.filTyp);

      d_storel(&pdata, data->u.fil.filUsrWds.fdType);
      d_storel(&pdata, data->u.fil.filUsrWds.fdCreator);
      d_storew(&pdata, data->u.fil.filUsrWds.fdFlags);
      d_storew(&pdata, data->u.fil.filUsrWds.fdLocation.v);
      d_storew(&pdata, data->u.fil.filUsrWds.fdLocation.h);
      d_storew(&pdata, data->u.fil.filUsrWds.fdFldr);

      d_storel(&pdata, data->u.fil.filFlNum);

      d_storew(&pdata, data->u.fil.filStBlk);
      d_storel(&pdata, data->u.fil.filLgLen);
      d_storel(&pdata, data->u.fil.filPyLen);

      d_storew(&pdata, data->u.fil.filRStBlk);
      d_storel(&pdata, data->u.fil.filRLgLen);
      d_storel(&pdata, data->u.fil.filRPyLen);

      d_storel(&pdata, data->u.fil.filCrDat);
      d_storel(&pdata, data->u.fil.filMdDat);
      d_storel(&pdata, data->u.fil.filBkDat);

      d_storew(&pdata, data->u.fil.filFndrInfo.fdIconID);
      for (i = 0; i < 4; ++i)
	d_storew(&pdata, data->u.fil.filFndrInfo.fdUnused[i]);
      d_storew(&pdata, data->u.fil.filFndrInfo.fdComment);
      d_storel(&pdata, data->u.fil.filFndrInfo.fdPutAway);

      d_storew(&pdata, data->u.fil.filClpSize);

      for (i = 0; i < 3; ++i)
	{
	  d_storew(&pdata, data->u.fil.filExtRec[i].xdrStABN);
	  d_storew(&pdata, data->u.fil.filExtRec[i].xdrNumABlks);
	}

      for (i = 0; i < 3; ++i)
	{
	  d_storew(&pdata, data->u.fil.filRExtRec[i].xdrStABN);
	  d_storew(&pdata, data->u.fil.filRExtRec[i].xdrNumABlks);
	}

      d_storel(&pdata, data->u.fil.filResrv);
      break;

    case cdrThdRec:
      for (i = 0; i < 2; ++i)
	d_storel(&pdata, data->u.dthd.thdResrv[i]);

      d_storel(&pdata, data->u.dthd.thdParID);
      d_stores(&pdata, data->u.dthd.thdCName, sizeof(data->u.dthd.thdCName));
      break;

    case cdrFThdRec:
      for (i = 0; i < 2; ++i)
	d_storel(&pdata, data->u.fthd.fthdResrv[i]);

      d_storel(&pdata, data->u.fthd.fthdParID);
      d_stores(&pdata, data->u.fthd.fthdCName, sizeof(data->u.fthd.fthdCName));
      break;

    default:
      abort();
    }

  if (len)
    *len += pdata - start;
}

/*
 * NAME:	record->unpackcatdata()
 * DESCRIPTION:	unpack catalog record data
 */
void r_unpackcatdata(pdata, data)
	unsigned char	*pdata;
	CatDataRec	*data;
{
  int i;

  d_fetchb(&pdata, (char *) &data->cdrType);
  d_fetchb(&pdata, (char *) &data->cdrResrv2);

  switch (data->cdrType)
    {
    case cdrDirRec:
      d_fetchw(&pdata, &data->u.dir.dirFlags);
      d_fetchw(&pdata, (short *) &data->u.dir.dirVal);
      d_fetchl(&pdata, (long *) &data->u.dir.dirDirID);
      d_fetchl(&pdata, &data->u.dir.dirCrDat);
      d_fetchl(&pdata, &data->u.dir.dirMdDat);
      d_fetchl(&pdata, &data->u.dir.dirBkDat);

      d_fetchw(&pdata, &data->u.dir.dirUsrInfo.frRect.top);
      d_fetchw(&pdata, &data->u.dir.dirUsrInfo.frRect.left);