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block: adding lzfse decompressing support as a module.

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QEMU dmg support includes zlib and bzip2, but it does not contains lzfse
support. This commit adds the source file to extend compression support
for new DMGs.

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Julio Faracco 2018-11-05 13:08:03 -02:00 committed by Kevin Wolf
parent d8d5fefd86
commit c13e80d792
1 changed files with 49 additions and 0 deletions
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block/dmg-lzfse.c Normal file
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/*
* DMG lzfse uncompression
*
* Copyright (c) 2018 Julio Cesar Faracco
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "dmg.h"
#include <lzfse.h>
static int dmg_uncompress_lzfse_do(char *next_in, unsigned int avail_in,
char *next_out, unsigned int avail_out)
{
size_t out_size = lzfse_decode_buffer((uint8_t *) next_out, avail_out,
(uint8_t *) next_in, avail_in,
NULL);
/* We need to decode the single chunk only. */
/* So, out_size == avail_out is not an error here. */
if (out_size > 0) {
return out_size;
}
return -1;
}
__attribute__((constructor))
static void dmg_lzfse_init(void)
{
assert(!dmg_uncompress_lzfse);
dmg_uncompress_lzfse = dmg_uncompress_lzfse_do;
}