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archiver_mvl.c
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/
archiver_mvl.c
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/*
* MVL support routines for PhysicsFS.
*
* This driver handles Descent II Movielib archives.
*
* The file format of MVL is quite easy...
*
* //MVL File format - Written by Heiko Herrmann
* char sig[4] = {'D','M', 'V', 'L'}; // "DMVL"=Descent MoVie Library
*
* int num_files; // the number of files in this MVL
*
* struct {
* char file_name[13]; // Filename, padded to 13 bytes with 0s
* int file_size; // filesize in bytes
* }DIR_STRUCT[num_files];
*
* struct {
* char data[file_size]; // The file data
* }FILE_STRUCT[num_files];
*
* (That info is from http://www.descent2.com/ddn/specs/mvl/)
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Bradley Bell.
* Based on grp.c by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_MVL
static int mvlLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
{
PHYSFS_uint32 location = 8 + (17 * count); /* past sig+metadata. */
PHYSFS_uint32 i;
for (i = 0; i < count; i++)
{
PHYSFS_uint32 size;
char name[13];
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 13), 0);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
name[12] = '\0'; /* just in case. */
size = PHYSFS_swapULE32(size);
BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, location, size), 0);
location += size;
} /* for */
return 1;
} /* mvlLoadEntries */
static void *MVL_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
PHYSFS_uint8 buf[4];
PHYSFS_uint32 count = 0;
void *unpkarc;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 4), NULL);
BAIL_IF(memcmp(buf, "DMVL", 4) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL);
count = PHYSFS_swapULE32(count);
unpkarc = UNPK_openArchive(io, count);
BAIL_IF_ERRPASS(!unpkarc, NULL);
if (!mvlLoadEntries(io, count, unpkarc))
{
UNPK_closeArchive(unpkarc);
return NULL;
} /* if */
return unpkarc;
} /* MVL_openArchive */
const PHYSFS_Archiver __PHYSFS_Archiver_MVL =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"MVL",
"Descent II Movielib format",
"Bradley Bell <btb@icculus.org>",
"https://icculus.org/physfs/",
0, /* supportsSymlinks */
},
MVL_openArchive,
UNPK_enumerateFiles,
UNPK_openRead,
UNPK_openWrite,
UNPK_openAppend,
UNPK_remove,
UNPK_mkdir,
UNPK_stat,
UNPK_closeArchive
};
#endif /* defined PHYSFS_SUPPORTS_MVL */
/* end of archiver_mvl.c ... */