misc/libphysfs/archiver_qpak.c
author nemo
Wed, 14 Mar 2018 11:36:43 -0400
changeset 13201 25502e6b3e08
parent 12213 bb5522e88ab2
permissions -rw-r--r--
While the intent was good, saving column width/sort was unfortunately not handling the addition of new columns and old configs were losing columns. If this is restored, it should have some check on column with invalidation of config.

/*
 * QPAK support routines for PhysicsFS.
 *
 *  This archiver handles the archive format utilized by Quake 1 and 2.
 *  Quake3-based games use the PkZip/Info-Zip format (which our zip.c
 *  archiver handles).
 *
 *  ========================================================================
 *
 *  This format info (in more detail) comes from:
 *     http://debian.fmi.uni-sofia.bg/~sergei/cgsr/docs/pak.txt
 *
 *  Quake PAK Format
 *
 *  Header
 *   (4 bytes)  signature = 'PACK'
 *   (4 bytes)  directory offset
 *   (4 bytes)  directory length
 *
 *  Directory
 *   (56 bytes) file name
 *   (4 bytes)  file position
 *   (4 bytes)  file length
 *
 *  ========================================================================
 *
 * Please see the file LICENSE.txt in the source's root directory.
 *
 *  This file written by Ryan C. Gordon.
 */

#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"

#if PHYSFS_SUPPORTS_QPAK

#define QPAK_SIG 0x4B434150   /* "PACK" in ASCII. */

static UNPKentry *qpakLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
{
    UNPKentry *entries = NULL;
    UNPKentry *entry = NULL;

    entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
    BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    for (entry = entries; fileCount > 0; fileCount--, entry++)
    {
        if (!__PHYSFS_readAll(io, &entry->name, 56)) goto failed;
        if (!__PHYSFS_readAll(io, &entry->startPos, 4)) goto failed;
        if (!__PHYSFS_readAll(io, &entry->size, 4)) goto failed;
        entry->size = PHYSFS_swapULE32(entry->size);
        entry->startPos = PHYSFS_swapULE32(entry->startPos);
    } /* for */

    return entries;

failed:
    allocator.Free(entries);
    return NULL;
} /* qpakLoadEntries */


static void *QPAK_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
    UNPKentry *entries = NULL;
    PHYSFS_uint32 val = 0;
    PHYSFS_uint32 pos = 0;
    PHYSFS_uint32 count = 0;

    assert(io != NULL);  /* shouldn't ever happen. */

    BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);

    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
    if (PHYSFS_swapULE32(val) != QPAK_SIG)
        BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);

    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
    pos = PHYSFS_swapULE32(val);  /* directory table offset. */

    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
    count = PHYSFS_swapULE32(val);

    /* corrupted archive? */
    BAIL_IF_MACRO((count % 64) != 0, PHYSFS_ERR_CORRUPT, NULL);
    count /= 64;

    BAIL_IF_MACRO(!io->seek(io, pos), ERRPASS, NULL);

    entries = qpakLoadEntries(io, count);
    BAIL_IF_MACRO(!entries, ERRPASS, NULL);
    return UNPK_openArchive(io, entries, count);
} /* QPAK_openArchive */


const PHYSFS_Archiver __PHYSFS_Archiver_QPAK =
{
    CURRENT_PHYSFS_ARCHIVER_API_VERSION,
    {
        "PAK",
        "Quake I/II format",
        "Ryan C. Gordon <icculus@icculus.org>",
        "https://icculus.org/physfs/",
        0,  /* supportsSymlinks */
    },
    QPAK_openArchive,
    UNPK_enumerateFiles,
    UNPK_openRead,
    UNPK_openWrite,
    UNPK_openAppend,
    UNPK_remove,
    UNPK_mkdir,
    UNPK_stat,
    UNPK_closeArchive
};

#endif  /* defined PHYSFS_SUPPORTS_QPAK */

/* end of archiver_qpak.c ... */