108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* MVL support routines for PhysicsFS.
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*
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* This driver handles Descent II Movielib archives.
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*
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* The file format of MVL is quite easy...
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*
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* //MVL File format - Written by Heiko Herrmann
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* char sig[4] = {'D','M', 'V', 'L'}; // "DMVL"=Descent MoVie Library
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*
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* int num_files; // the number of files in this MVL
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*
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* struct {
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* char file_name[13]; // Filename, padded to 13 bytes with 0s
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* int file_size; // filesize in bytes
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* }DIR_STRUCT[num_files];
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*
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* struct {
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* char data[file_size]; // The file data
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* }FILE_STRUCT[num_files];
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*
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* (That info is from http://www.descent2.com/ddn/specs/mvl/)
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*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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* This file written by Bradley Bell.
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* Based on grp.c by Ryan C. Gordon.
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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_MVL
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static UNPKentry *mvlLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
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{
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PHYSFS_uint32 location = 8; /* sizeof sig. */
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UNPKentry *entries = NULL;
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UNPKentry *entry = NULL;
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entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
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BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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location += (17 * fileCount);
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for (entry = entries; fileCount > 0; fileCount--, entry++)
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{
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if (!__PHYSFS_readAll(io, &entry->name, 13)) goto failed;
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if (!__PHYSFS_readAll(io, &entry->size, 4)) goto failed;
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entry->size = PHYSFS_swapULE32(entry->size);
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entry->startPos = location;
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location += entry->size;
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} /* for */
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return entries;
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failed:
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allocator.Free(entries);
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return NULL;
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} /* mvlLoadEntries */
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static void *MVL_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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PHYSFS_uint8 buf[4];
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PHYSFS_uint32 count = 0;
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UNPKentry *entries = NULL;
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assert(io != NULL); /* shouldn't ever happen. */
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BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, buf, 4), ERRPASS, NULL);
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BAIL_IF_MACRO(memcmp(buf, "DMVL", 4) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof(count)), ERRPASS, NULL);
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count = PHYSFS_swapULE32(count);
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entries = mvlLoadEntries(io, count);
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return (!entries) ? NULL : UNPK_openArchive(io, entries, count);
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} /* MVL_openArchive */
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const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_MVL =
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{
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"MVL",
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"Descent II Movielib format",
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"Bradley Bell <btb@icculus.org>",
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"http://icculus.org/physfs/",
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};
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const PHYSFS_Archiver __PHYSFS_Archiver_MVL =
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{
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&__PHYSFS_ArchiveInfo_MVL,
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MVL_openArchive, /* openArchive() method */
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UNPK_enumerateFiles, /* enumerateFiles() method */
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UNPK_openRead, /* openRead() method */
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UNPK_openWrite, /* openWrite() method */
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UNPK_openAppend, /* openAppend() method */
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UNPK_remove, /* remove() method */
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UNPK_mkdir, /* mkdir() method */
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UNPK_closeArchive, /* closeArchive() method */
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UNPK_stat /* stat() method */
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};
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#endif /* defined PHYSFS_SUPPORTS_MVL */
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/* end of mvl.c ... */
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