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
  29 static 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))
  56 static void dmg_bz2_init(void)
  57 {
  58     assert(!dmg_uncompress_bz2);
  59     dmg_uncompress_bz2 = dmg_uncompress_bz2_do;
  60 }