115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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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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*
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* The 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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* another, divided by a 17 bytes header, which specifies the name
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* and length (in bytes) of the forthcoming file! So you just read
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* the header with its information of how big the following file is,
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* and then skip exact that number of bytes to get to the next file
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* in that HOG.
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*
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* char sig[3] = {'D', 'H', 'F'}; // "DHF"=Descent HOG File
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*
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* struct {
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* char file_name[13]; // Filename, padded to 13 bytes with 0s
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* int file_size; // filesize in bytes
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* char data[file_size]; // The file data
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* } FILE_STRUCT; // Repeated until the end of the file.
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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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* 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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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_HOG
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static int hogLoadEntries(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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while (pos < iolen)
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{
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PHYSFS_uint32 size;
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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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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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/* skip over entry */
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BAIL_IF_ERRPASS(!io->seek(io, pos), 0);
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} /* while */
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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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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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*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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{
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UNPK_abandonArchive(unpkarc);
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return NULL;
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} /* if */
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return unpkarc;
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} /* HOG_openArchive */
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const PHYSFS_Archiver __PHYSFS_Archiver_HOG =
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{
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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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"Bradley Bell <btb@icculus.org>",
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"https://icculus.org/physfs/",
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0, /* supportsSymlinks */
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},
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HOG_openArchive,
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UNPK_enumerate,
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UNPK_openRead,
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UNPK_openWrite,
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UNPK_openAppend,
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UNPK_remove,
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UNPK_mkdir,
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UNPK_stat,
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UNPK_closeArchive
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};
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#endif /* defined PHYSFS_SUPPORTS_HOG */
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/* end of physfs_archiver_hog.c ... */
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