113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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* GRP support routines for PhysicsFS.
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*
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* This driver handles BUILD engine archives ("groupfiles"). This format
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* (but not this driver) was put together by Ken Silverman.
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*
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* The format is simple enough. In Ken's words:
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*
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* What's the .GRP file format?
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*
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* The ".grp" file format is just a collection of a lot of files stored
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* into 1 big one. I tried to make the format as simple as possible: The
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* first 12 bytes contains my name, "KenSilverman". The next 4 bytes is
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* the number of files that were compacted into the group file. Then for
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* each file, there is a 16 byte structure, where the first 12 bytes are
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* the filename, and the last 4 bytes are the file's size. The rest of
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* the group file is just the raw data packed one after the other in the
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* same order as the list of files.
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*
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* (That info is from http://www.advsys.net/ken/build.htm ...)
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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 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_GRP
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static UNPKentry *grpLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
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{
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PHYSFS_uint32 location = 16; /* sizeof sig. */
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UNPKentry *entries = NULL;
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UNPKentry *entry = NULL;
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char *ptr = NULL;
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entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
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BAIL_IF(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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location += (16 * fileCount);
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for (entry = entries; fileCount > 0; fileCount--, entry++)
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{
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GOTO_IF_ERRPASS(!__PHYSFS_readAll(io, &entry->name, 12), failed);
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GOTO_IF_ERRPASS(!__PHYSFS_readAll(io, &entry->size, 4), failed);
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entry->name[12] = '\0'; /* name isn't null-terminated in file. */
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if ((ptr = strchr(entry->name, ' ')) != NULL)
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*ptr = '\0'; /* trim extra spaces. */
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entry->size = PHYSFS_swapULE32(entry->size);
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entry->startPos = location;
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location += entry->size;
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} /* for */
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return entries;
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failed:
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allocator.Free(entries);
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return NULL;
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} /* grpLoadEntries */
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static void *GRP_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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PHYSFS_uint8 buf[12];
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PHYSFS_uint32 count = 0;
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UNPKentry *entries = 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, sizeof (buf)), NULL);
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if (memcmp(buf, "KenSilverman", sizeof (buf)) != 0)
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BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL);
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count = PHYSFS_swapULE32(count);
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entries = grpLoadEntries(io, count);
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BAIL_IF_ERRPASS(!entries, NULL);
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return UNPK_openArchive(io, entries, count);
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} /* GRP_openArchive */
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const PHYSFS_Archiver __PHYSFS_Archiver_GRP =
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{
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CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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{
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"GRP",
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"Build engine Groupfile format",
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"Ryan C. Gordon <icculus@icculus.org>",
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"https://icculus.org/physfs/",
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0, /* supportsSymlinks */
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},
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GRP_openArchive,
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UNPK_enumerateFiles,
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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_GRP */
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/* end of archiver_grp.c ... */
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