/
archiver_grp.c
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/
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 ...)
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_GRP
static UNPKentry *grpLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
{
PHYSFS_uint32 location = 16; /* sizeof sig. */
UNPKentry *entries = NULL;
UNPKentry *entry = NULL;
char *ptr = NULL;
entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
BAIL_IF(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
location += (16 * fileCount);
for (entry = entries; fileCount > 0; fileCount--, entry++)
{
GOTO_IF_ERRPASS(!__PHYSFS_readAll(io, &entry->name, 12), failed);
GOTO_IF_ERRPASS(!__PHYSFS_readAll(io, &entry->size, 4), failed);
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;
location += entry->size;
} /* for */
return entries;
failed:
allocator.Free(entries);
return NULL;
} /* grpLoadEntries */
static void *GRP_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
PHYSFS_uint8 buf[12];
PHYSFS_uint32 count = 0;
UNPKentry *entries = NULL;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL);
if (memcmp(buf, "KenSilverman", sizeof (buf)) != 0)
BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL);
count = PHYSFS_swapULE32(count);
entries = grpLoadEntries(io, count);
BAIL_IF_ERRPASS(!entries, NULL);
return UNPK_openArchive(io, entries, count);
} /* GRP_openArchive */
const PHYSFS_Archiver __PHYSFS_Archiver_GRP =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"GRP",
"Build engine Groupfile format",
"Ryan C. Gordon <icculus@icculus.org>",
"https://icculus.org/physfs/",
0, /* supportsSymlinks */
},
GRP_openArchive,
UNPK_enumerateFiles,
UNPK_openRead,
UNPK_openWrite,
UNPK_openAppend,
UNPK_remove,
UNPK_mkdir,
UNPK_stat,
UNPK_closeArchive
};
#endif /* defined PHYSFS_SUPPORTS_GRP */
/* end of archiver_grp.c ... */