/*

 * 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>",

        "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 ... */