misc/libphysfs/archiver_slb.c
author nemo
Mon, 10 Apr 2017 12:06:43 -0400
changeset 12218 bb5522e88ab2
permissions -rw-r--r--
bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash

/*
 * SLB support routines for PhysicsFS.
 *
 * This driver handles SLB archives ("slab files"). This uncompressed format
 * is used in I-War / Independence War and Independence War: Defiance.
 *
 * The format begins with four zero bytes (version?), the file count and the
 * location of the table of contents. Each ToC entry contains a 64-byte buffer
 * containing a zero-terminated filename, the offset of the data, and its size.
 * All the filenames begin with the separator character '\'. 
 *
 * Please see the file LICENSE.txt in the source's root directory.
 *
 * This file written by Aleksi Nurmi, based on the GRP archiver by
 * Ryan C. Gordon.
 */

#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"

#if PHYSFS_SUPPORTS_SLB

static UNPKentry *slbLoadEntries(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++)
    {
        char *ptr;

        /* don't include the '\' in the beginning */
        char backslash;
        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &backslash, 1), ERRPASS, failed);
        GOTO_IF_MACRO(backslash != '\\', ERRPASS, failed);

        /* read the rest of the buffer, 63 bytes */
        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->name, 63), ERRPASS, failed);
        entry->name[63] = '\0'; /* in case the name lacks the null terminator */

        /* convert backslashes */
        for (ptr = entry->name; *ptr; ptr++)
        {
            if (*ptr == '\\')
                *ptr = '/';
        } /* for */

        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->startPos, 4),
                      ERRPASS, failed);
        entry->startPos = PHYSFS_swapULE32(entry->startPos);

        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->size, 4), ERRPASS, failed);
        entry->size = PHYSFS_swapULE32(entry->size);
    } /* for */
    
    return entries;

failed:
    allocator.Free(entries);
    return NULL;

} /* slbLoadEntries */


static void *SLB_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
    PHYSFS_uint32 version;
    PHYSFS_uint32 count = 0;
    PHYSFS_uint32 tocPos = 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, &version, sizeof(version)),
                  ERRPASS, NULL);
    version = PHYSFS_swapULE32(version);
    BAIL_IF_MACRO(version != 0, ERRPASS, NULL);

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

    /* offset of the table of contents */
    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &tocPos, sizeof(tocPos)),
                  ERRPASS, NULL);
    tocPos = PHYSFS_swapULE32(tocPos);
    
    /* seek to the table of contents */
    BAIL_IF_MACRO(!io->seek(io, tocPos), ERRPASS, NULL);

    entries = slbLoadEntries(io, count);
    BAIL_IF_MACRO(!entries, ERRPASS, NULL);

    return UNPK_openArchive(io, entries, count);
} /* SLB_openArchive */


const PHYSFS_Archiver __PHYSFS_Archiver_SLB =
{
    CURRENT_PHYSFS_ARCHIVER_API_VERSION,
    {
        "SLB",
        "I-War / Independence War Slab file",
        "Aleksi Nurmi <aleksi.nurmi@gmail.com>",
        "https://bitbucket.org/ahnurmi/",
        0,  /* supportsSymlinks */
    },
    SLB_openArchive,
    UNPK_enumerateFiles,
    UNPK_openRead,
    UNPK_openWrite,
    UNPK_openAppend,
    UNPK_remove,
    UNPK_mkdir,
    UNPK_stat,
    UNPK_closeArchive
};

#endif  /* defined PHYSFS_SUPPORTS_SLB */

/* end of archiver_slb.c ... */