LXR qemu/block/dmg-lzfse.c

   1/*
   2 * DMG lzfse uncompression
   3 *
   4 * Copyright (c) 2018 Julio Cesar Faracco
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24#include "qemu/osdep.h"
  25#include "dmg.h"
  26#include <lzfse.h>
  27
  28static int dmg_uncompress_lzfse_do(char *next_in, unsigned int avail_in,
  29                                   char *next_out, unsigned int avail_out)
  30{
  31    size_t out_size = lzfse_decode_buffer((uint8_t *) next_out, avail_out,
  32                                          (uint8_t *) next_in, avail_in,
  33                                          NULL);
  34
  35    /* We need to decode the single chunk only. */
  36    /* So, out_size == avail_out is not an error here. */
  37    if (out_size > 0) {
  38        return out_size;
  39    }
  40    return -1;
  41}
  42
  43__attribute__((constructor))
  44static void dmg_lzfse_init(void)
  45{
  46    assert(!dmg_uncompress_lzfse);
  47    dmg_uncompress_lzfse = dmg_uncompress_lzfse_do;
  48}
  49