archiver_grp.c
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/*
* GRP support routines for PhysicsFS.
*
* This driver handles BUILD engine archives ("groupfiles"). This format
* (but not this driver) was put together by Ken Silverman.
*
* The format is simple enough. In Ken's words:
*
* What's the .GRP file format?
*
* The ".grp" file format is just a collection of a lot of files stored
* into 1 big one. I tried to make the format as simple as possible: The
* first 12 bytes contains my name, "KenSilverman". The next 4 bytes is
* the number of files that were compacted into the group file. Then for
* each file, there is a 16 byte structure, where the first 12 bytes are
* the filename, and the last 4 bytes are the file's size. The rest of
* the group file is just the raw data packed one after the other in the
* same order as the list of files.
*
* (That info is from http://www.advsys.net/ken/build.htm ...)
*
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* Please see the file LICENSE.txt in the source's root directory.
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*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#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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PHYSFS_uint32 location = 16; /* sizeof sig. */
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UNPKentry *entries = NULL;
UNPKentry *entry = NULL;
char *ptr = NULL;
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entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
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BAIL_IF_MACRO(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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GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->name, 12), ERRPASS, failed);
GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->size, 4), ERRPASS, failed);
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entry->name[12] = '\0'; /* name isn't null-terminated in file. */
if ((ptr = strchr(entry->name, ' ')) != NULL)
*ptr = '\0'; /* trim extra spaces. */
entry->size = PHYSFS_swapULE32(entry->size);
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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allocator.Free(entries);
return NULL;
} /* grpLoadEntries */
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static void *GRP_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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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_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, buf, sizeof (buf)), ERRPASS, NULL);
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if (memcmp(buf, "KenSilverman", sizeof (buf)) != 0)
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BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof(count)), ERRPASS, NULL);
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count = PHYSFS_swapULE32(count);
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entries = grpLoadEntries(io, count);
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BAIL_IF_MACRO(!entries, ERRPASS, 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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{
"GRP",
"Build engine Groupfile format",
"Ryan C. Gordon <icculus@icculus.org>",
"http://icculus.org/physfs/",
},
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GRP_openArchive, /* openArchive() method */
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UNPK_enumerateFiles, /* enumerateFiles() method */
UNPK_openRead, /* openRead() method */
UNPK_openWrite, /* openWrite() method */
UNPK_openAppend, /* openAppend() method */
UNPK_remove, /* remove() method */
UNPK_mkdir, /* mkdir() method */
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UNPK_closeArchive, /* closeArchive() method */
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UNPK_stat /* stat() method */
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#endif /* defined PHYSFS_SUPPORTS_GRP */
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/* end of archiver_grp.c ... */