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1.1 ! root 1: /* ! 2: * libhfs - library for reading and writing Macintosh HFS volumes ! 3: * Copyright (C) 1996-1998 Robert Leslie ! 4: * ! 5: * This program is free software; you can redistribute it and/or modify ! 6: * it under the terms of the GNU General Public License as published by ! 7: * the Free Software Foundation; either version 2 of the License, or ! 8: * (at your option) any later version. ! 9: * ! 10: * This program is distributed in the hope that it will be useful, ! 11: * but WITHOUT ANY WARRANTY; without even the implied warranty of ! 12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ! 13: * GNU General Public License for more details. ! 14: * ! 15: * You should have received a copy of the GNU General Public License ! 16: * along with this program; if not, write to the Free Software ! 17: * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, ! 18: * MA 02110-1301, USA. ! 19: * ! 20: * $Id: file.c,v 1.9 1998/11/02 22:08:59 rob Exp $ ! 21: */ ! 22: ! 23: #include "config.h" ! 24: #include "libhfs.h" ! 25: #include "file.h" ! 26: #include "btree.h" ! 27: #include "record.h" ! 28: #include "volume.h" ! 29: ! 30: /* ! 31: * NAME: file->init() ! 32: * DESCRIPTION: initialize file structure ! 33: */ ! 34: void f_init(hfsfile *file, hfsvol *vol, long cnid, const char *name) ! 35: { ! 36: int i; ! 37: ! 38: file->vol = vol; ! 39: file->parid = 0; ! 40: ! 41: strcpy(file->name, name); ! 42: ! 43: file->cat.cdrType = cdrFilRec; ! 44: file->cat.cdrResrv2 = 0; ! 45: ! 46: file->cat.u.fil.filFlags = 0; ! 47: file->cat.u.fil.filTyp = 0; ! 48: ! 49: file->cat.u.fil.filUsrWds.fdType = 0; ! 50: file->cat.u.fil.filUsrWds.fdCreator = 0; ! 51: file->cat.u.fil.filUsrWds.fdFlags = 0; ! 52: file->cat.u.fil.filUsrWds.fdLocation.v = 0; ! 53: file->cat.u.fil.filUsrWds.fdLocation.h = 0; ! 54: file->cat.u.fil.filUsrWds.fdFldr = 0; ! 55: ! 56: file->cat.u.fil.filFlNum = cnid; ! 57: file->cat.u.fil.filStBlk = 0; ! 58: file->cat.u.fil.filLgLen = 0; ! 59: file->cat.u.fil.filPyLen = 0; ! 60: file->cat.u.fil.filRStBlk = 0; ! 61: file->cat.u.fil.filRLgLen = 0; ! 62: file->cat.u.fil.filRPyLen = 0; ! 63: file->cat.u.fil.filCrDat = 0; ! 64: file->cat.u.fil.filMdDat = 0; ! 65: file->cat.u.fil.filBkDat = 0; ! 66: ! 67: file->cat.u.fil.filFndrInfo.fdIconID = 0; ! 68: for (i = 0; i < 4; ++i) ! 69: file->cat.u.fil.filFndrInfo.fdUnused[i] = 0; ! 70: file->cat.u.fil.filFndrInfo.fdComment = 0; ! 71: file->cat.u.fil.filFndrInfo.fdPutAway = 0; ! 72: ! 73: file->cat.u.fil.filClpSize = 0; ! 74: ! 75: for (i = 0; i < 3; ++i) ! 76: { ! 77: file->cat.u.fil.filExtRec[i].xdrStABN = 0; ! 78: file->cat.u.fil.filExtRec[i].xdrNumABlks = 0; ! 79: ! 80: file->cat.u.fil.filRExtRec[i].xdrStABN = 0; ! 81: file->cat.u.fil.filRExtRec[i].xdrNumABlks = 0; ! 82: } ! 83: ! 84: file->cat.u.fil.filResrv = 0; ! 85: ! 86: f_selectfork(file, fkData); ! 87: ! 88: file->flags = 0; ! 89: ! 90: file->prev = NULL; ! 91: file->next = NULL; ! 92: } ! 93: ! 94: /* ! 95: * NAME: file->selectfork() ! 96: * DESCRIPTION: choose a fork for file operations ! 97: */ ! 98: void f_selectfork(hfsfile *file, int fork) ! 99: { ! 100: file->fork = fork; ! 101: ! 102: memcpy(&file->ext, fork == fkData ? ! 103: &file->cat.u.fil.filExtRec : &file->cat.u.fil.filRExtRec, ! 104: sizeof(ExtDataRec)); ! 105: ! 106: file->fabn = 0; ! 107: file->pos = 0; ! 108: } ! 109: ! 110: /* ! 111: * NAME: file->getptrs() ! 112: * DESCRIPTION: make pointers to the current fork's lengths and extents ! 113: */ ! 114: void f_getptrs(hfsfile *file, ExtDataRec **extrec, ! 115: unsigned long **lglen, unsigned long **pylen) ! 116: { ! 117: if (file->fork == fkData) ! 118: { ! 119: if (extrec) ! 120: *extrec = &file->cat.u.fil.filExtRec; ! 121: if (lglen) ! 122: *lglen = &file->cat.u.fil.filLgLen; ! 123: if (pylen) ! 124: *pylen = &file->cat.u.fil.filPyLen; ! 125: } ! 126: else ! 127: { ! 128: if (extrec) ! 129: *extrec = &file->cat.u.fil.filRExtRec; ! 130: if (lglen) ! 131: *lglen = &file->cat.u.fil.filRLgLen; ! 132: if (pylen) ! 133: *pylen = &file->cat.u.fil.filRPyLen; ! 134: } ! 135: } ! 136: ! 137: /* ! 138: * NAME: file->doblock() ! 139: * DESCRIPTION: read or write a numbered block from a file ! 140: */ ! 141: int f_doblock(hfsfile *file, unsigned long num, block *bp, ! 142: int (*func)(hfsvol *, unsigned int, unsigned int, block *)) ! 143: { ! 144: unsigned int abnum; ! 145: unsigned int blnum; ! 146: unsigned int fabn; ! 147: int i; ! 148: ! 149: abnum = num / file->vol->lpa; ! 150: blnum = num % file->vol->lpa; ! 151: ! 152: /* locate the appropriate extent record */ ! 153: ! 154: fabn = file->fabn; ! 155: ! 156: if (abnum < fabn) ! 157: { ! 158: ExtDataRec *extrec; ! 159: ! 160: f_getptrs(file, &extrec, NULL, NULL); ! 161: ! 162: fabn = file->fabn = 0; ! 163: memcpy(&file->ext, extrec, sizeof(ExtDataRec)); ! 164: } ! 165: else ! 166: abnum -= fabn; ! 167: ! 168: while (1) ! 169: { ! 170: unsigned int n; ! 171: ! 172: for (i = 0; i < 3; ++i) ! 173: { ! 174: n = file->ext[i].xdrNumABlks; ! 175: ! 176: if (abnum < n) ! 177: return func(file->vol, file->ext[i].xdrStABN + abnum, blnum, bp); ! 178: ! 179: fabn += n; ! 180: abnum -= n; ! 181: } ! 182: ! 183: if (v_extsearch(file, fabn, &file->ext, NULL) <= 0) ! 184: goto fail; ! 185: ! 186: file->fabn = fabn; ! 187: } ! 188: ! 189: fail: ! 190: return -1; ! 191: }
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