misc/libphysfs/archiver_mvl.c
author Wuzzy <Wuzzy2@mail.ru>
Fri, 09 Mar 2018 19:05:59 +0100
changeset 13145 5083fb0a2992
parent 12213 bb5522e88ab2
permissions -rw-r--r--
A Classic Fairytale: Harden all missions against missing campaign variables in team file and assume default values This assumes the worst case in which the team file is missing all campaign variables except Progress. This has been successfully tested with all 10 missions and still generates a logical storyline. By default, the game assumes: - The cyborg's offer in mission 2 was refused - The traitor in mission 5 was killed As a consequence, missions 8 and 10 use the princessScene cut scene.

/*
 * 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 ... */