517 lines
10 KiB
C
517 lines
10 KiB
C
/*
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* libhfs - library for reading and writing Macintosh HFS volumes
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* Copyright (C) 1996-1998 Robert Leslie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: file.c,v 1.9 1998/11/02 22:08:59 rob Exp $
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*/
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# include <string.h>
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# include <errno.h>
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# include "libhfs.h"
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# include "file.h"
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# include "btree.h"
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# include "record.h"
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# include "volume.h"
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/*
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* NAME: file->init()
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* DESCRIPTION: initialize file structure
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*/
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void f_init(hfsfile *file, hfsvol *vol, long cnid, const char *name)
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{
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int i;
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file->vol = vol;
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file->parid = 0;
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strcpy(file->name, name);
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file->cat.cdrType = cdrFilRec;
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file->cat.cdrResrv2 = 0;
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file->cat.u.fil.filFlags = 0;
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file->cat.u.fil.filTyp = 0;
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file->cat.u.fil.filUsrWds.fdType = 0;
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file->cat.u.fil.filUsrWds.fdCreator = 0;
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file->cat.u.fil.filUsrWds.fdFlags = 0;
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file->cat.u.fil.filUsrWds.fdLocation.v = 0;
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file->cat.u.fil.filUsrWds.fdLocation.h = 0;
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file->cat.u.fil.filUsrWds.fdFldr = 0;
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file->cat.u.fil.filFlNum = cnid;
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file->cat.u.fil.filStBlk = 0;
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file->cat.u.fil.filLgLen = 0;
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file->cat.u.fil.filPyLen = 0;
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file->cat.u.fil.filRStBlk = 0;
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file->cat.u.fil.filRLgLen = 0;
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file->cat.u.fil.filRPyLen = 0;
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file->cat.u.fil.filCrDat = 0;
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file->cat.u.fil.filMdDat = 0;
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file->cat.u.fil.filBkDat = 0;
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file->cat.u.fil.filFndrInfo.fdIconID = 0;
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for (i = 0; i < 4; ++i)
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file->cat.u.fil.filFndrInfo.fdUnused[i] = 0;
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file->cat.u.fil.filFndrInfo.fdComment = 0;
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file->cat.u.fil.filFndrInfo.fdPutAway = 0;
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file->cat.u.fil.filClpSize = 0;
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for (i = 0; i < 3; ++i)
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{
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file->cat.u.fil.filExtRec[i].xdrStABN = 0;
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file->cat.u.fil.filExtRec[i].xdrNumABlks = 0;
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file->cat.u.fil.filRExtRec[i].xdrStABN = 0;
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file->cat.u.fil.filRExtRec[i].xdrNumABlks = 0;
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}
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file->cat.u.fil.filResrv = 0;
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f_selectfork(file, fkData);
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file->flags = 0;
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file->prev = 0;
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file->next = 0;
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}
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/*
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* NAME: file->selectfork()
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* DESCRIPTION: choose a fork for file operations
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*/
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void f_selectfork(hfsfile *file, int fork)
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{
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file->fork = fork;
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memcpy(&file->ext, fork == fkData ?
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&file->cat.u.fil.filExtRec : &file->cat.u.fil.filRExtRec,
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sizeof(ExtDataRec));
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file->fabn = 0;
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file->pos = 0;
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}
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/*
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* NAME: file->getptrs()
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* DESCRIPTION: make pointers to the current fork's lengths and extents
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*/
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void f_getptrs(hfsfile *file, ExtDataRec **extrec,
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unsigned long **lglen, unsigned long **pylen)
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{
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if (file->fork == fkData)
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{
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if (extrec)
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*extrec = &file->cat.u.fil.filExtRec;
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if (lglen)
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*lglen = &file->cat.u.fil.filLgLen;
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if (pylen)
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*pylen = &file->cat.u.fil.filPyLen;
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}
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else
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{
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if (extrec)
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*extrec = &file->cat.u.fil.filRExtRec;
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if (lglen)
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*lglen = &file->cat.u.fil.filRLgLen;
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if (pylen)
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*pylen = &file->cat.u.fil.filRPyLen;
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}
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}
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/*
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* NAME: file->doblock()
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* DESCRIPTION: read or write a numbered block from a file
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*/
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int f_doblock(hfsfile *file, unsigned long num, block *bp,
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int (*func)(hfsvol *, unsigned int, unsigned int, block *))
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{
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unsigned int abnum;
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unsigned int blnum;
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unsigned int fabn;
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int i;
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abnum = num / file->vol->lpa;
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blnum = num % file->vol->lpa;
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/* locate the appropriate extent record */
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fabn = file->fabn;
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if (abnum < fabn)
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{
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ExtDataRec *extrec;
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f_getptrs(file, &extrec, 0, 0);
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fabn = file->fabn = 0;
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memcpy(&file->ext, extrec, sizeof(ExtDataRec));
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}
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else
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abnum -= fabn;
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while (1)
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{
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unsigned int n;
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for (i = 0; i < 3; ++i)
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{
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n = file->ext[i].xdrNumABlks;
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if (abnum < n)
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return func(file->vol, file->ext[i].xdrStABN + abnum, blnum, bp);
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fabn += n;
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abnum -= n;
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}
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if (v_extsearch(file, fabn, &file->ext, 0) <= 0)
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goto fail;
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file->fabn = fabn;
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}
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fail:
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return -1;
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}
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/*
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* NAME: file->addextent()
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* DESCRIPTION: add an extent to a file
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*/
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int f_addextent(hfsfile *file, ExtDescriptor *blocks)
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{
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hfsvol *vol = file->vol;
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ExtDataRec *extrec;
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unsigned long *pylen;
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unsigned int start, end;
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node n;
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int i;
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f_getptrs(file, &extrec, 0, &pylen);
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start = file->fabn;
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end = *pylen / vol->mdb.drAlBlkSiz;
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n.nnum = 0;
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i = -1;
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while (start < end)
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{
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for (i = 0; i < 3; ++i)
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{
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unsigned int num;
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num = file->ext[i].xdrNumABlks;
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start += num;
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if (start == end)
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break;
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else if (start > end)
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ERROR(EIO, "file extents exceed file physical length");
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else if (num == 0)
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ERROR(EIO, "empty file extent");
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}
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if (start == end)
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break;
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if (v_extsearch(file, start, &file->ext, &n) <= 0)
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goto fail;
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file->fabn = start;
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}
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if (i >= 0 &&
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file->ext[i].xdrStABN + file->ext[i].xdrNumABlks == blocks->xdrStABN)
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file->ext[i].xdrNumABlks += blocks->xdrNumABlks;
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else
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{
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/* create a new extent descriptor */
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if (++i < 3)
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file->ext[i] = *blocks;
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else
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{
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ExtKeyRec key;
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byte record[HFS_MAX_EXTRECLEN];
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unsigned int reclen;
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/* record is full; create a new one */
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file->ext[0] = *blocks;
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for (i = 1; i < 3; ++i)
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{
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file->ext[i].xdrStABN = 0;
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file->ext[i].xdrNumABlks = 0;
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}
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file->fabn = start;
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r_makeextkey(&key, file->fork, file->cat.u.fil.filFlNum, end);
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r_packextrec(&key, &file->ext, record, &reclen);
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if (bt_insert(&vol->ext, record, reclen) == -1)
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goto fail;
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i = -1;
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}
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}
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if (i >= 0)
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{
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/* store the modified extent record */
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if (file->fabn)
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{
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if ((n.nnum == 0 &&
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v_extsearch(file, file->fabn, 0, &n) <= 0) ||
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v_putextrec(&file->ext, &n) == -1)
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goto fail;
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}
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else
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memcpy(extrec, &file->ext, sizeof(ExtDataRec));
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}
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*pylen += blocks->xdrNumABlks * vol->mdb.drAlBlkSiz;
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file->flags |= HFS_FILE_UPDATE_CATREC;
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return 0;
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fail:
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return -1;
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}
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/*
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* NAME: file->alloc()
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* DESCRIPTION: reserve allocation blocks for a file
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*/
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long f_alloc(hfsfile *file)
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{
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hfsvol *vol = file->vol;
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unsigned long clumpsz;
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ExtDescriptor blocks;
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clumpsz = file->cat.u.fil.filClpSize;
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if (clumpsz == 0)
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{
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if (file == &vol->ext.f)
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clumpsz = vol->mdb.drXTClpSiz;
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else if (file == &vol->cat.f)
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clumpsz = vol->mdb.drCTClpSiz;
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else
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clumpsz = vol->mdb.drClpSiz;
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}
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blocks.xdrNumABlks = clumpsz / vol->mdb.drAlBlkSiz;
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if (v_allocblocks(vol, &blocks) == -1)
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goto fail;
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if (f_addextent(file, &blocks) == -1)
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{
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v_freeblocks(vol, &blocks);
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goto fail;
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}
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return blocks.xdrNumABlks;
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fail:
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return -1;
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}
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/*
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* NAME: file->trunc()
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* DESCRIPTION: release allocation blocks unneeded by a file
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*/
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int f_trunc(hfsfile *file)
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{
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hfsvol *vol = file->vol;
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ExtDataRec *extrec;
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unsigned long *lglen, *pylen, alblksz, newpylen;
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unsigned int dlen, start, end;
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node n;
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int i;
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if (vol->flags & HFS_VOL_READONLY)
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goto done;
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f_getptrs(file, &extrec, &lglen, &pylen);
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alblksz = vol->mdb.drAlBlkSiz;
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newpylen = (*lglen / alblksz + (*lglen % alblksz != 0)) * alblksz;
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if (newpylen > *pylen)
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ERROR(EIO, "file size exceeds physical length");
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else if (newpylen == *pylen)
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goto done;
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dlen = (*pylen - newpylen) / alblksz;
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start = file->fabn;
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end = newpylen / alblksz;
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if (start >= end)
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{
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start = file->fabn = 0;
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memcpy(&file->ext, extrec, sizeof(ExtDataRec));
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}
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n.nnum = 0;
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i = -1;
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while (start < end)
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{
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for (i = 0; i < 3; ++i)
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{
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unsigned int num;
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num = file->ext[i].xdrNumABlks;
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start += num;
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if (start >= end)
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break;
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else if (num == 0)
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ERROR(EIO, "empty file extent");
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}
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if (start >= end)
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break;
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if (v_extsearch(file, start, &file->ext, &n) <= 0)
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goto fail;
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file->fabn = start;
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}
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if (start > end)
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{
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ExtDescriptor blocks;
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file->ext[i].xdrNumABlks -= start - end;
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dlen -= start - end;
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blocks.xdrStABN = file->ext[i].xdrStABN + file->ext[i].xdrNumABlks;
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blocks.xdrNumABlks = start - end;
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if (v_freeblocks(vol, &blocks) == -1)
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goto fail;
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}
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*pylen = newpylen;
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file->flags |= HFS_FILE_UPDATE_CATREC;
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do
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{
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while (dlen && ++i < 3)
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{
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unsigned int num;
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num = file->ext[i].xdrNumABlks;
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start += num;
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if (num == 0)
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ERROR(EIO, "empty file extent");
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else if (num > dlen)
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ERROR(EIO, "file extents exceed physical size");
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dlen -= num;
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if (v_freeblocks(vol, &file->ext[i]) == -1)
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goto fail;
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file->ext[i].xdrStABN = 0;
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file->ext[i].xdrNumABlks = 0;
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}
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if (file->fabn)
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{
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if (n.nnum == 0 &&
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v_extsearch(file, file->fabn, 0, &n) <= 0)
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goto fail;
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if (file->ext[0].xdrNumABlks)
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{
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if (v_putextrec(&file->ext, &n) == -1)
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goto fail;
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}
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else
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{
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if (bt_delete(&vol->ext, HFS_NODEREC(n, n.rnum)) == -1)
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goto fail;
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n.nnum = 0;
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}
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}
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else
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memcpy(extrec, &file->ext, sizeof(ExtDataRec));
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if (dlen)
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{
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if (v_extsearch(file, start, &file->ext, &n) <= 0)
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goto fail;
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file->fabn = start;
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i = -1;
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}
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}
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while (dlen);
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done:
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return 0;
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fail:
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return -1;
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}
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/*
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* NAME: file->flush()
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* DESCRIPTION: flush all pending changes to an open file
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*/
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int f_flush(hfsfile *file)
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{
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hfsvol *vol = file->vol;
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if (vol->flags & HFS_VOL_READONLY)
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goto done;
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if (file->flags & HFS_FILE_UPDATE_CATREC)
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{
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node n;
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file->cat.u.fil.filStBlk = file->cat.u.fil.filExtRec[0].xdrStABN;
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file->cat.u.fil.filRStBlk = file->cat.u.fil.filRExtRec[0].xdrStABN;
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if (v_catsearch(vol, file->parid, file->name, 0, 0, &n) <= 0 ||
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v_putcatrec(&file->cat, &n) == -1)
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goto fail;
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file->flags &= ~HFS_FILE_UPDATE_CATREC;
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}
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done:
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return 0;
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fail:
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return -1;
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}
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