misc/libphysfs/archiver_hog.c
author koda
Mon, 01 Jun 2015 14:39:25 +0200
branch0.9.20
changeset 9934 57f9ce8b2854
parent 8524 a65e9bcf0a03
child 12213 bb5522e88ab2
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/*
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 * HOG support routines for PhysicsFS.
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 *
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 * This driver handles Descent I/II HOG archives.
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 *
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 * The format is very simple:
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 *
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 *   The file always starts with the 3-byte signature "DHF" (Descent
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 *   HOG file). After that the files of a HOG are just attached after
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 *   another, divided by a 17 bytes header, which specifies the name
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 *   and length (in bytes) of the forthcoming file! So you just read
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 *   the header with its information of how big the following file is,
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 *   and then skip exact that number of bytes to get to the next file
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 *   in that HOG.
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 *
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 *    char sig[3] = {'D', 'H', 'F'}; // "DHF"=Descent HOG File
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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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 *     char data[file_size]; // The file data
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 *    } FILE_STRUCT; // Repeated until the end of the file.
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 *
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 * (That info is from http://www.descent2.com/ddn/specs/hog/)
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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_HOG
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static UNPKentry *hogLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 *_entCount)
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{
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    const PHYSFS_uint64 iolen = io->length(io);
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    PHYSFS_uint32 entCount = 0;
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    void *ptr = NULL;
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    UNPKentry *entries = NULL;
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    UNPKentry *entry = NULL;
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    PHYSFS_uint32 size = 0;
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    PHYSFS_uint32 pos = 3;
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    while (pos < iolen)
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    {
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        entCount++;
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        ptr = allocator.Realloc(ptr, sizeof (UNPKentry) * entCount);
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        GOTO_IF_MACRO(ptr == NULL, PHYSFS_ERR_OUT_OF_MEMORY, failed);
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        entries = (UNPKentry *) ptr;
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        entry = &entries[entCount-1];
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->name, 13), ERRPASS, failed);
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        pos += 13;
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &size, 4), ERRPASS, failed);
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        pos += 4;
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        entry->size = PHYSFS_swapULE32(size);
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        entry->startPos = pos;
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        pos += size;
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        /* skip over entry */
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        GOTO_IF_MACRO(!io->seek(io, pos), ERRPASS, failed);
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    } /* while */
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    *_entCount = entCount;
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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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} /* hogLoadEntries */
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static void *HOG_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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    PHYSFS_uint8 buf[3];
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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, 3), ERRPASS, NULL);
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    BAIL_IF_MACRO(memcmp(buf, "DHF", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
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    entries = hogLoadEntries(io, &count);
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    BAIL_IF_MACRO(!entries, ERRPASS, NULL);
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    return UNPK_openArchive(io, entries, count);
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} /* HOG_openArchive */
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const PHYSFS_Archiver __PHYSFS_Archiver_HOG =
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{
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    {
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        "HOG",
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        "Descent I/II HOG file 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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    HOG_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_HOG */
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/* end of hog.c ... */
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