LXR qemu/block/dmg-bz2.c

   1/*
   2 * DMG bzip2 uncompression
   3 *
   4 * Copyright (c) 2004 Johannes E. Schindelin
   5 * Copyright (c) 2016 Red Hat, Inc.
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25#include "qemu/osdep.h"
  26#include "dmg.h"
  27#include <bzlib.h>
  28
  29static int dmg_uncompress_bz2_do(char *next_in, unsigned int avail_in,
  30                                 char *next_out, unsigned int avail_out)
  31{
  32    int ret;
  33    uint64_t total_out;
  34    bz_stream bzstream = {};
  35
  36    ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
  37    if (ret != BZ_OK) {
  38        return -1;
  39    }
  40    bzstream.next_in = next_in;
  41    bzstream.avail_in = avail_in;
  42    bzstream.next_out = next_out;
  43    bzstream.avail_out = avail_out;
  44    ret = BZ2_bzDecompress(&bzstream);
  45    total_out = ((uint64_t)bzstream.total_out_hi32 << 32) +
  46                bzstream.total_out_lo32;
  47    BZ2_bzDecompressEnd(&bzstream);
  48    if (ret != BZ_STREAM_END ||
  49        total_out != avail_out) {
  50        return -1;
  51    }
  52    return 0;
  53}
  54
  55__attribute__((constructor))
  56static void dmg_bz2_init(void)
  57{
  58    assert(!dmg_uncompress_bz2);
  59    dmg_uncompress_bz2 = dmg_uncompress_bz2_do;
  60}
  61