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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 UNPKentry *mvlLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
{
PHYSFS_uint32 location = 8; /* sizeof sig. */
UNPKentry *entries = NULL;
UNPKentry *entry = NULL;
entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
location += (17 * fileCount);
for (entry = entries; fileCount > 0; fileCount--, entry++)
{
if (!__PHYSFS_readAll(io, &entry->name, 13)) goto failed;
if (!__PHYSFS_readAll(io, &entry->size, 4)) goto failed;
entry->size = PHYSFS_swapULE32(entry->size);
entry->startPos = location;
location += entry->size;
} /* for */
return entries;
failed:
allocator.Free(entries);
return NULL;
} /* mvlLoadEntries */
static void *MVL_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
PHYSFS_uint8 buf[4];
PHYSFS_uint32 count = 0;
UNPKentry *entries = NULL;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_MACRO(!__PHYSFS_readAll(io, buf, 4), ERRPASS, NULL);
BAIL_IF_MACRO(memcmp(buf, "DMVL", 4) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof(count)), ERRPASS, NULL);
count = PHYSFS_swapULE32(count);
entries = mvlLoadEntries(io, count);
return (!entries) ? NULL : UNPK_openArchive(io, entries, count);
} /* MVL_openArchive */
const PHYSFS_Archiver __PHYSFS_Archiver_MVL =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"MVL",
"Descent II Movielib format",
"Bradley Bell <btb@icculus.org>",
"http://icculus.org/physfs/",
0, /* supportsSymlinks */
},
MVL_openArchive,
UNPK_enumerateFiles,
UNPK_openRead,
UNPK_openWrite,
UNPK_openAppend,
UNPK_remove,
UNPK_mkdir,
UNPK_closeArchive,
UNPK_stat
};
#endif /* defined PHYSFS_SUPPORTS_MVL */
/* end of archiver_mvl.c ... */