141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*
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* Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License version 2 (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of the above. If you wish to
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* allow the use of your version of this file only under the terms of the
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* GPL and not to allow others to use your version of this file under the
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* BSD license, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the GPL. If
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* you do not delete the provisions above, a recipient may use your version
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* of this file under either the BSD or the GPL.
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*/
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#include "lzfP.h"
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#if AVOID_ERRNO
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# define SET_ERRNO(n)
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#else
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# include <errno.h>
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# define SET_ERRNO(n) errno = (n)
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#endif
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unsigned int
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lzf_decompress (const void *const in_data, unsigned int in_len,
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void *out_data, unsigned int out_len)
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{
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u8 const *ip = (const u8 *)in_data;
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u8 *op = (u8 *)out_data;
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u8 const *const in_end = ip + in_len;
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u8 *const out_end = op + out_len;
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do
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{
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unsigned int ctrl = *ip++;
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if (ctrl < (1 << 5)) /* literal run */
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{
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ctrl++;
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if (op + ctrl > out_end)
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{
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SET_ERRNO (E2BIG);
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return 0;
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}
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#if CHECK_INPUT
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if (ip + ctrl > in_end)
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{
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SET_ERRNO (EINVAL);
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return 0;
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}
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#endif
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#if USE_MEMCPY
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memcpy (op, ip, ctrl);
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op += ctrl;
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ip += ctrl;
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#else
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do
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*op++ = *ip++;
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while (--ctrl);
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#endif
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}
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else /* back reference */
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{
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unsigned int len = ctrl >> 5;
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u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
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#if CHECK_INPUT
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if (ip >= in_end)
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{
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SET_ERRNO (EINVAL);
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return 0;
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}
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#endif
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if (len == 7)
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{
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len += *ip++;
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#if CHECK_INPUT
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if (ip >= in_end)
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{
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SET_ERRNO (EINVAL);
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return 0;
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}
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#endif
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}
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ref -= *ip++;
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if (op + len + 2 > out_end)
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{
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SET_ERRNO (E2BIG);
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return 0;
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}
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if (ref < (u8 *)out_data)
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{
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SET_ERRNO (EINVAL);
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return 0;
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}
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*op++ = *ref++;
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*op++ = *ref++;
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do
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*op++ = *ref++;
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while (--len);
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}
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}
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while (ip < in_end);
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return op - (u8 *)out_data;
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}
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