hog: Added support for HOG2 (Descent 3) archives.
This commit is contained in:
Ryan C. Gordon
parent
9cb45dc6cb
commit
a8180f0e4c
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@ -145,7 +145,7 @@
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* - .ISO (ISO9660 files, CD-ROM images)
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* - .GRP (Build Engine groupfile archives)
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* - .PAK (Quake I/II archive format)
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* - .HOG (Descent I/II HOG file archives)
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* - .HOG (Descent I/II/III HOG file archives)
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* - .MVL (Descent II movielib archives)
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* - .WAD (DOOM engine archives)
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* - .VDF (Gothic I/II engine archives)
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@ -1,9 +1,9 @@
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/*
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* HOG support routines for PhysicsFS.
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*
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* This driver handles Descent I/II HOG archives.
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* This driver handles Descent I/II/III HOG archives.
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*
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* The format is very simple:
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* The Descent I/II format is very simple:
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*
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* The file always starts with the 3-byte signature "DHF" (Descent
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* HOG file). After that the files of a HOG are just attached after
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@ -23,10 +23,23 @@
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*
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* (That info is from http://www.descent2.com/ddn/specs/hog/)
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*
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* Descent 3 moved to HOG2 format, which starts with the chars "HOG2",
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* then 32-bits for the number of contained files, 32 bits for the offset
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* to the first file's data, then 56 bytes of 0xFF (reserved?). Then for
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* each file, there's 36 bytes for filename (null-terminated, rest of bytes
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* are garbage), 32-bits unknown/reserved (always zero?), 32-bits of length
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* of file data, 32-bits of time since Unix epoch. Then immediately following,
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* for each file is their uncompressed content, you can find its offset
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* by starting at the initial data offset and adding the filesize of each
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* prior file.
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*
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* This information was found at:
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* https://web.archive.org/web/20020213004051/http://descent-3.com/ddn/specs/hog/
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*
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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 written by Bradley Bell.
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* Based on grp.c by Ryan C. Gordon.
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* This file written by Bradley Bell and Ryan C. Gordon.
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*/
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#define __PHYSICSFS_INTERNAL__
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@ -34,7 +47,15 @@
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#if PHYSFS_SUPPORTS_HOG
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static int hogLoadEntries(PHYSFS_Io *io, void *arc)
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static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val)
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{
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PHYSFS_uint32 v;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
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*val = PHYSFS_swapULE32(v);
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return 1;
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} /* readui32 */
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static int hog1LoadEntries(PHYSFS_Io *io, void *arc)
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{
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const PHYSFS_uint64 iolen = io->length(io);
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PHYSFS_uint32 pos = 3;
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@ -45,11 +66,10 @@ static int hogLoadEntries(PHYSFS_Io *io, void *arc)
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char name[13];
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 13), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
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BAIL_IF_ERRPASS(!readui32(io, &size), 0);
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name[12] = '\0'; /* just in case. */
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pos += 13 + 4;
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size = PHYSFS_swapULE32(size);
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BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
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pos += size;
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@ -60,24 +80,60 @@ static int hogLoadEntries(PHYSFS_Io *io, void *arc)
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return 1;
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} /* hogLoadEntries */
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static int hog2LoadEntries(PHYSFS_Io *io, void *arc)
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{
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PHYSFS_uint32 numfiles;
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PHYSFS_uint32 pos;
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PHYSFS_uint32 i;
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BAIL_IF_ERRPASS(!readui32(io, &numfiles), 0);
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BAIL_IF_ERRPASS(!readui32(io, &pos), 0);
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BAIL_IF_ERRPASS(!io->seek(io, 68), 0); /* skip to end of header. */
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for (i = 0; i < numfiles; i++) {
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char name[37];
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PHYSFS_uint32 reserved;
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PHYSFS_uint32 size;
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PHYSFS_uint32 mtime;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 36), 0);
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BAIL_IF_ERRPASS(!readui32(io, &reserved), 0);
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BAIL_IF_ERRPASS(!readui32(io, &size), 0);
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BAIL_IF_ERRPASS(!readui32(io, &mtime), 0);
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name[36] = '\0'; /* just in case */
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BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, mtime, mtime, pos, size), 0);
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pos += size;
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}
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return 1;
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} /* hogLoadEntries */
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static void *HOG_openArchive(PHYSFS_Io *io, const char *name,
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int forWriting, int *claimed)
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{
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PHYSFS_uint8 buf[3];
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void *unpkarc = NULL;
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int hog1 = 0;
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assert(io != NULL); /* shouldn't ever happen. */
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BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 3), NULL);
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BAIL_IF(memcmp(buf, "DHF", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
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if (memcmp(buf, "DHF", 3) == 0)
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hog1 = 1; /* original HOG (Descent 1 and 2) archive */
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else
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{
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BAIL_IF(memcmp(buf, "HOG", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL); /* Not HOG2 */
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 1), NULL);
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BAIL_IF(buf[0] != '2', PHYSFS_ERR_UNSUPPORTED, NULL); /* Not HOG2 */
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} /* else */
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*claimed = 1;
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unpkarc = UNPK_openArchive(io);
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BAIL_IF_ERRPASS(!unpkarc, NULL);
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if (!hogLoadEntries(io, unpkarc))
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if (!(hog1 ? hog1LoadEntries(io, unpkarc) : hog2LoadEntries(io, unpkarc)))
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{
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UNPK_abandonArchive(unpkarc);
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return NULL;
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@ -92,7 +148,7 @@ const PHYSFS_Archiver __PHYSFS_Archiver_HOG =
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CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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{
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"HOG",
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"Descent I/II HOG file format",
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"Descent I/II/III HOG file format",
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"Bradley Bell <btb@icculus.org>",
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"https://icculus.org/physfs/",
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0, /* supportsSymlinks */
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