101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Original source:
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* Copyright (c) 2003 by Joergen Ibsen / Jibz
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*
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* Rockbox adaptation:
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* Copyright (c) 2010 by Marcin Bukat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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* tinfzlib - tiny zlib decompressor
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*
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* Copyright (c) 2003 by Joergen Ibsen / Jibz
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* All Rights Reserved
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*
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* http://www.ibsensoftware.com/
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*
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* This software is provided 'as-is', without any express
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* or implied warranty. In no event will the authors be
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* held liable for any damages arising from the use of
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* this software.
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*
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* Permission is granted to anyone to use this software
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* for any purpose, including commercial applications,
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* and to alter it and redistribute it freely, subject to
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* the following restrictions:
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*
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* 1. The origin of this software must not be
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* misrepresented; you must not claim that you
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* wrote the original software. If you use this
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* software in a product, an acknowledgment in
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* the product documentation would be appreciated
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* but is not required.
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*
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* 2. Altered source versions must be plainly marked
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* as such, and must not be misrepresented as
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* being the original software.
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*
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* 3. This notice may not be removed or altered from
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* any source distribution.
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*/
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#include "tinf.h"
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/* This routine do not check adler32 checksum
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* as it is tailored to be used as PNG decompressor
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* and PNG has crc32 check of the compressed block
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* already
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*/
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int tinf_zlib_uncompress(void *dest, unsigned int *destLen,
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const void *source, unsigned int sourceLen)
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{
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unsigned char *src = (unsigned char *)source;
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unsigned char *dst = (unsigned char *)dest;
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int res;
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unsigned char cmf, flg;
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/* -- get header bytes -- */
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cmf = src[0];
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flg = src[1];
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/* -- check format -- */
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/* check checksum */
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if (((cmf << 8) + flg) % 31) return TINF_DATA_ERROR;
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/* check method is deflate */
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if ((cmf & 0x0f) != 8) return TINF_DATA_ERROR;
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/* check window size is valid */
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if ((cmf >> 4) > 7) return TINF_DATA_ERROR;
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/* check there is no preset dictionary */
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if (flg & 0x20) return TINF_DATA_ERROR;
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/* -- inflate -- */
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res = tinf_uncompress(dst, destLen, src + 2, sourceLen - 6);
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if (res != TINF_OK) return TINF_DATA_ERROR;
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return TINF_OK;
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}
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