116 lines
3.3 KiB
C
116 lines
3.3 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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#if (defined PHYSFS_SUPPORTS_MVL)
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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static inline int readAll(PHYSFS_Io *io, void *buf, const PHYSFS_uint64 len)
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{
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return (io->read(io, buf, len) == len);
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} /* readAll */
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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, 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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GOTO_IF_MACRO(!readAll(io, &entry->name, 13), NULL, mvlLoad_failed);
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GOTO_IF_MACRO(!readAll(io, &entry->size, 4), NULL, mvlLoad_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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mvlLoad_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 entryCount = 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, ERR_ARC_IS_READ_ONLY, 0);
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BAIL_IF_MACRO(!readAll(io, buf, 4), NULL, NULL);
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BAIL_IF_MACRO(memcmp(buf, "DMVL", 4) != 0, ERR_NOT_AN_ARCHIVE, NULL);
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BAIL_IF_MACRO(!readAll(io, &entryCount, sizeof (entryCount)), NULL, NULL);
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entryCount = PHYSFS_swapULE32(entryCount);
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entries = mvlLoadEntries(io, entryCount);
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BAIL_IF_MACRO(entries == NULL, NULL, NULL);
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return UNPK_openArchive(io, entries, entryCount);
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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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MVL_ARCHIVE_DESCRIPTION,
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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_dirClose, /* dirClose() 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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