387 lines
14 KiB
C
387 lines
14 KiB
C
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/*
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* ISO9660 support routines for PhysicsFS.
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*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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* This file originally written by Christoph Nelles, but was largely
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* rewritten by Ryan C. Gordon (so please harass Ryan about bugs and not
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* Christoph).
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*/
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/*
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* Handles CD-ROM disk images (and raw CD-ROM devices).
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*
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* Not supported:
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* - Rock Ridge (needed for sparse files, device nodes and symlinks, etc).
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* - Non 2048 Sectors
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* - TRANS.TBL (maps 8.3 filenames on old discs to long filenames).
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* - Multiextents (4gb max file size without it).
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* - UDF
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*
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* Deviations from the standard
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* - Ignores mandatory sort order
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* - Allows various invalid file names
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*
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* Problems
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* - Ambiguities in the standard
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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_ISO9660
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#include <time.h>
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/* ISO9660 often stores values in both big and little endian formats: little
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first, followed by big. While technically there might be different values
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in each, we just always use the littleendian ones and swap ourselves. The
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fields aren't aligned anyhow, so you have to serialize them in any case
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to avoid crashes on many CPU archs in any case. */
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static int iso9660LoadEntries(PHYSFS_Io *io, const int joliet,
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const char *base, const PHYSFS_uint64 dirstart,
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const PHYSFS_uint64 dirend, void *unpkarc);
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static int iso9660AddEntry(PHYSFS_Io *io, const int joliet, const int isdir,
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const char *base, PHYSFS_uint8 *fname,
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const int fnamelen, const PHYSFS_sint64 ts,
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const PHYSFS_uint64 pos, const PHYSFS_uint64 len,
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void *unpkarc)
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{
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char *fullpath;
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char *fnamecpy;
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size_t baselen;
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size_t fullpathlen;
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void *entry;
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int i;
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if (fnamelen == 1 && ((fname[0] == 0) || (fname[0] == 1)))
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return 1; /* Magic that represents "." and "..", ignore */
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BAIL_IF(fnamelen == 0, PHYSFS_ERR_CORRUPT, 0);
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assert(fnamelen > 0);
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assert(fnamelen <= 255);
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BAIL_IF(joliet && (fnamelen % 2), PHYSFS_ERR_CORRUPT, 0);
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/* Joliet is UCS-2, so at most UTF-8 will double the byte size */
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baselen = strlen(base);
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fullpathlen = baselen + (fnamelen * (joliet ? 2 : 1)) + 2;
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fullpath = (char *) __PHYSFS_smallAlloc(fullpathlen);
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BAIL_IF(!fullpath, PHYSFS_ERR_OUT_OF_MEMORY, 0);
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fnamecpy = fullpath;
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if (baselen > 0)
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{
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snprintf(fullpath, fullpathlen, "%s/", base);
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fnamecpy += baselen + 1;
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fullpathlen -= baselen - 1;
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} /* if */
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if (joliet)
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{
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PHYSFS_uint16 *ucs2 = (PHYSFS_uint16 *) fname;
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int total = fnamelen / 2;
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for (i = 0; i < total; i++)
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ucs2[i] = PHYSFS_swapUBE16(ucs2[i]);
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ucs2[total] = '\0';
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PHYSFS_utf8FromUcs2(ucs2, fnamecpy, fullpathlen);
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} /* if */
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else
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{
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for (i = 0; i < fnamelen; i++)
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{
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/* We assume the filenames are low-ASCII; consider the archive
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corrupt if we see something above 127, since we don't know the
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encoding. (We can change this later if we find out these exist
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and are intended to be, say, latin-1 or UTF-8 encoding). */
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BAIL_IF(fname[i] > 127, PHYSFS_ERR_CORRUPT, 0);
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fnamecpy[i] = fname[i];
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} /* for */
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fnamecpy[fnamelen] = '\0';
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if (!isdir)
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{
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/* find last SEPARATOR2 */
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char *ptr = strrchr(fnamecpy, ';');
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if (ptr && (ptr != fnamecpy))
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*(ptr--) = '\0';
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else
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ptr = fnamecpy + (fnamelen - 1);
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/* chop out any trailing '.', as done in all implementations */
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if (*ptr == '.')
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*ptr = '\0';
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} /* if */
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} /* else */
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entry = UNPK_addEntry(unpkarc, fullpath, isdir, ts, ts, pos, len);
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if ((entry) && (isdir))
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{
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if (!iso9660LoadEntries(io, joliet, fullpath, pos, pos + len, unpkarc))
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entry = NULL; /* so we report a failure later. */
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} /* if */
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__PHYSFS_smallFree(fullpath);
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return entry != NULL;
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} /* iso9660AddEntry */
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static int iso9660LoadEntries(PHYSFS_Io *io, const int joliet,
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const char *base, const PHYSFS_uint64 dirstart,
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const PHYSFS_uint64 dirend, void *unpkarc)
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{
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PHYSFS_uint64 readpos = dirstart;
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while (1)
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{
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PHYSFS_uint8 recordlen;
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PHYSFS_uint8 extattrlen;
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PHYSFS_uint32 extent;
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PHYSFS_uint32 datalen;
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PHYSFS_uint8 ignore[4];
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PHYSFS_uint8 year, month, day, hour, minute, second, offset;
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PHYSFS_uint8 flags;
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PHYSFS_uint8 fnamelen;
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PHYSFS_uint8 fname[256];
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PHYSFS_sint64 timestamp;
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struct tm t;
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int isdir;
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int multiextent;
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BAIL_IF_ERRPASS(!io->seek(io, readpos), 0);
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/* recordlen = 0 -> no more entries or fill entry */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &recordlen, 1), 0);
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if (recordlen > 0)
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readpos += recordlen; /* ready to seek to next record. */
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else
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{
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PHYSFS_uint64 nextpos;
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/* if we are in the last sector of the directory & it's 0 -> end */
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if ((dirend - 2048) <= (readpos - 1))
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break; /* finished */
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/* else skip to the next sector & continue; */
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nextpos = (((readpos - 1) / 2048) + 1) * 2048;
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/* whoops, can't make forward progress! */
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BAIL_IF(nextpos == readpos, PHYSFS_ERR_CORRUPT, 0);
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readpos = nextpos;
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continue; /* start back at upper loop. */
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} /* else */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &extattrlen, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &extent, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* extent be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &datalen, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* datalen be */
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/* record timestamp */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &year, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &month, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &day, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &hour, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &minute, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &second, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &offset, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &flags, 1), 0);
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isdir = (flags & (1 << 1)) != 0;
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multiextent = (flags & (1 << 7)) != 0;
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BAIL_IF(multiextent, PHYSFS_ERR_UNSUPPORTED, 0); /* !!! FIXME */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 1), 0); /* unit size */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 1), 0); /* interleave gap */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* seqnum le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* seqnum be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &fnamelen, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, fname, fnamelen), 0);
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t.tm_sec = second;
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t.tm_min = minute;
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t.tm_hour = hour;
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t.tm_mday = day;
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t.tm_mon = month - 1;
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t.tm_year = year;
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t.tm_wday = 0;
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t.tm_yday = 0;
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t.tm_isdst = -1;
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timestamp = (PHYSFS_sint64) mktime(&t);
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extent += extattrlen; /* skip extended attribute record. */
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/* infinite loop, corrupt file? */
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BAIL_IF((extent * 2048) == dirstart, PHYSFS_ERR_CORRUPT, 0);
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if (!iso9660AddEntry(io, joliet, isdir, base, fname, fnamelen,
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timestamp, extent * 2048, datalen, unpkarc))
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{
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return 0;
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} /* if */
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} /* while */
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return 1;
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} /* iso9660LoadEntries */
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static int parseVolumeDescriptor(PHYSFS_Io *io, PHYSFS_uint64 *_rootpos,
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PHYSFS_uint64 *_rootlen, int *_joliet,
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int *_claimed)
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{
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PHYSFS_uint64 pos = 32768; /* start at the Primary Volume Descriptor */
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int found = 0;
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int done = 0;
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*_joliet = 0;
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while (!done)
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{
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PHYSFS_uint8 type;
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PHYSFS_uint8 identifier[5];
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PHYSFS_uint8 version;
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PHYSFS_uint8 flags;
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PHYSFS_uint8 escapeseqs[32];
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PHYSFS_uint8 ignore[32];
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PHYSFS_uint16 blocksize;
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PHYSFS_uint32 extent;
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PHYSFS_uint32 datalen;
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BAIL_IF_ERRPASS(!io->seek(io, pos), 0);
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pos += 2048; /* each volume descriptor is 2048 bytes */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &type, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &identifier, 5), 0);
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if (memcmp(identifier, "CD001", 5) != 0) /* maybe not an iso? */
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{
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BAIL_IF(!*_claimed, PHYSFS_ERR_UNSUPPORTED, 0);
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continue; /* just skip this one */
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} /* if */
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*_claimed = 1; /* okay, this is probably an iso. */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &version, 1), 0); /* version */
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BAIL_IF(version != 1, PHYSFS_ERR_UNSUPPORTED, 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &flags, 1), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 32), 0); /* system id */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 32), 0); /* volume id */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 8), 0); /* reserved */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* space le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* space be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, escapeseqs, 32), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* setsize le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* setsize be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* seq num le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* seq num be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &blocksize, 2), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 2), 0); /* blocklen be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* pthtablen le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* pthtablen be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* pthtabpos le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* optpthtabpos le */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* pthtabpos be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* optpthtabpos be */
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/* root directory record... */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 1), 0); /* len */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 1), 0); /* attr len */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &extent, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* extent be */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &datalen, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, ignore, 4), 0); /* datalen be */
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/* !!! FIXME: deal with this properly. */
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blocksize = PHYSFS_swapULE32(blocksize);
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BAIL_IF(blocksize && (blocksize != 2048), PHYSFS_ERR_UNSUPPORTED, 0);
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switch (type)
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{
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case 1: /* Primary Volume Descriptor */
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case 2: /* Supplementary Volume Descriptor */
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if (found < type)
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{
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*_rootpos = PHYSFS_swapULE32(extent) * 2048;
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*_rootlen = PHYSFS_swapULE32(datalen);
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found = type;
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if (found == 2) /* possible Joliet volume */
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{
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const PHYSFS_uint8 *s = escapeseqs;
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*_joliet = !(flags & 1) &&
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(s[0] == 0x25) && (s[1] == 0x2F) &&
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((s[2] == 0x40) || (s[2] == 0x43) || (s[2] == 0x45));
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} /* if */
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} /* if */
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break;
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case 255: /* type 255 terminates the volume descriptor list */
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done = 1;
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break;
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default:
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break; /* skip unknown types. */
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} /* switch */
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} /* while */
|
||
|
|
|
||
|
|
BAIL_IF(!found, PHYSFS_ERR_CORRUPT, 0);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
} /* parseVolumeDescriptor */
|
||
|
|
|
||
|
|
|
||
|
|
static void *ISO9660_openArchive(PHYSFS_Io *io, const char *filename,
|
||
|
|
int forWriting, int *claimed)
|
||
|
|
{
|
||
|
|
PHYSFS_uint64 rootpos = 0;
|
||
|
|
PHYSFS_uint64 len = 0;
|
||
|
|
int joliet = 0;
|
||
|
|
void *unpkarc = NULL;
|
||
|
|
|
||
|
|
assert(io != NULL); /* shouldn't ever happen. */
|
||
|
|
|
||
|
|
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
|
||
|
|
|
||
|
|
if (!parseVolumeDescriptor(io, &rootpos, &len, &joliet, claimed))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
unpkarc = UNPK_openArchive(io);
|
||
|
|
BAIL_IF_ERRPASS(!unpkarc, NULL);
|
||
|
|
|
||
|
|
if (!iso9660LoadEntries(io, joliet, "", rootpos, rootpos + len, unpkarc))
|
||
|
|
{
|
||
|
|
UNPK_abandonArchive(unpkarc);
|
||
|
|
return NULL;
|
||
|
|
} /* if */
|
||
|
|
|
||
|
|
return unpkarc;
|
||
|
|
} /* ISO9660_openArchive */
|
||
|
|
|
||
|
|
|
||
|
|
const PHYSFS_Archiver __PHYSFS_Archiver_ISO9660 =
|
||
|
|
{
|
||
|
|
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
|
||
|
|
{
|
||
|
|
"ISO",
|
||
|
|
"ISO9660 image file",
|
||
|
|
"Ryan C. Gordon <icculus@icculus.org>",
|
||
|
|
"https://icculus.org/physfs/",
|
||
|
|
0, /* supportsSymlinks */
|
||
|
|
},
|
||
|
|
ISO9660_openArchive,
|
||
|
|
UNPK_enumerate,
|
||
|
|
UNPK_openRead,
|
||
|
|
UNPK_openWrite,
|
||
|
|
UNPK_openAppend,
|
||
|
|
UNPK_remove,
|
||
|
|
UNPK_mkdir,
|
||
|
|
UNPK_stat,
|
||
|
|
UNPK_closeArchive
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* defined PHYSFS_SUPPORTS_ISO9660 */
|
||
|
|
|
||
|
|
/* end of physfs_archiver_iso9660.c ... */
|
||
|
|
|