305 lines
7.4 KiB
C
305 lines
7.4 KiB
C
/****************************************************************************
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* libs/libc/lzf/lzf_c.c
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*
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* Copyright (c) 2000-2010 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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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "lzf/lzf.h"
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#ifdef CONFIG_LIBC_LZF
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lzf_decompress
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*
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* Description:
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* Decompress data compressed with some version of the lzf_compress
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* function and stored at location in_data and length in_len. The result
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* will be stored at out_data up to a maximum of out_len characters.
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*
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* If the output buffer is not large enough to hold the decompressed
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* data, a 0 is returned and errno is set to E2BIG. Otherwise the number
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* of decompressed bytes (i.e. the original length of the data) is
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* returned.
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*
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* If an error in the compressed data is detected, a zero is returned and
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* errno is set to EINVAL.
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*
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* This function is very fast, about as fast as a copying loop.
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*
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****************************************************************************/
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unsigned int lzf_decompress (FAR const void *const in_data,
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unsigned int in_len, FAR void *out_data,
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unsigned int out_len)
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{
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FAR uint8_t const *ip = (const uint8_t *)in_data;
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FAR uint8_t *op = (uint8_t *)out_data;
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FAR uint8_t const *const in_end = ip + in_len;
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FAR uint8_t *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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#ifdef lzf_movsb
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lzf_movsb(op, ip, ctrl);
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#else
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switch (ctrl)
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{
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case 32:
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*op++ = *ip++;
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case 31:
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*op++ = *ip++;
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case 30:
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*op++ = *ip++;
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case 29:
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*op++ = *ip++;
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case 28:
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*op++ = *ip++;
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case 27:
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*op++ = *ip++;
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case 26:
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*op++ = *ip++;
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case 25:
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*op++ = *ip++;
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case 24:
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*op++ = *ip++;
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case 23:
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*op++ = *ip++;
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case 22:
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*op++ = *ip++;
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case 21:
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*op++ = *ip++;
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case 20:
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*op++ = *ip++;
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case 19:
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*op++ = *ip++;
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case 18:
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*op++ = *ip++;
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case 17:
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*op++ = *ip++;
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case 16:
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*op++ = *ip++;
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case 15:
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*op++ = *ip++;
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case 14:
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*op++ = *ip++;
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case 13:
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*op++ = *ip++;
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case 12:
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*op++ = *ip++;
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case 11:
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*op++ = *ip++;
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case 10:
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*op++ = *ip++;
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case 9:
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*op++ = *ip++;
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case 8:
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*op++ = *ip++;
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case 7:
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*op++ = *ip++;
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case 6:
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*op++ = *ip++;
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case 5:
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*op++ = *ip++;
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case 4:
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*op++ = *ip++;
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case 3:
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*op++ = *ip++;
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case 2:
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*op++ = *ip++;
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case 1:
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*op++ = *ip++;
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}
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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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FAR uint8_t *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 < (uint8_t *)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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#ifdef lzf_movsb
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len += 2;
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lzf_movsb(op, ref, len);
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#else
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switch (len)
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{
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default:
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len += 2;
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if (op >= ref + len)
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{
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/* Disjunct areas */
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memcpy (op, ref, len);
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op += len;
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}
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else
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{
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/* Overlapping, use octet by octet copying */
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do
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{
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*op++ = *ref++;
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}
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while (--len);
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}
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break;
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case 9:
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*op++ = *ref++;
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case 8:
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*op++ = *ref++;
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case 7:
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*op++ = *ref++;
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case 6:
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*op++ = *ref++;
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case 5:
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*op++ = *ref++;
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case 4:
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*op++ = *ref++;
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case 3:
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*op++ = *ref++;
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case 2:
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*op++ = *ref++;
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case 1:
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*op++ = *ref++;
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case 0:
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/* Two octets more */
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*op++ = *ref++;
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*op++ = *ref++;
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}
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#endif
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}
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}
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while (ip < in_end);
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return op - (uint8_t *)out_data;
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}
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#endif /* CONFIG_LIBC_LZF */
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