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-rw-r--r--lzo/src/lzo2a_9x.c364
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diff --git a/lzo/src/lzo2a_9x.c b/lzo/src/lzo2a_9x.c
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-/* lzo2a_9x.c -- implementation of the LZO2A-999 compression algorithm
-
- This file is part of the LZO real-time data compression library.
-
- Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
- Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
- All Rights Reserved.
-
- The LZO library is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of
- the License, or (at your option) any later version.
-
- The LZO library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with the LZO library; see the file COPYING.
- If not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
- Markus F.X.J. Oberhumer
- <markus@oberhumer.com>
- http://www.oberhumer.com/opensource/lzo/
- */
-
-
-
-#include "config2a.h"
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-#define SWD_THRESHOLD 1 /* lower limit for match length */
-#define SWD_F 2048 /* upper limit for match length */
-
-
-#define LZO2A 1
-#define LZO_COMPRESS_T lzo2a_999_t
-#define lzo_swd_t lzo2a_999_swd_t
-#include "lzo_mchw.ch"
-
-
-#if (LZO_CC_BORLANDC && LZO_MM_FLAT)
-# if ((__BORLANDC__) >= 0x0450 && (__BORLANDC__) < 0x0460)
- /* avoid internal compiler error */
-# pragma option -Od
-# endif
-#endif
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-#define putbyte(x) *op++ = LZO_BYTE(x)
-
-#define putbits(j,x) \
- if (k == 0) bitp = op++; \
- SETBITS(j,x); \
- if (k >= 8) { *bitp = LZO_BYTE(MASKBITS(8)); DUMPBITS(8); \
- if (k > 0) bitp = op++; }
-
-#define putbit(x) putbits(1,x)
-
-
-/***********************************************************************
-// this is a public function, but there is no prototype in a header file
-************************************************************************/
-
-LZO_EXTERN(int)
-lzo2a_999_compress_callback ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem,
- lzo_callback_p cb,
- lzo_uint max_chain );
-
-LZO_PUBLIC(int)
-lzo2a_999_compress_callback ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem,
- lzo_callback_p cb,
- lzo_uint max_chain )
-{
- lzo_bytep op;
- lzo_bytep bitp = 0;
- lzo_uint m_len, m_off;
- LZO_COMPRESS_T cc;
- LZO_COMPRESS_T * const c = &cc;
- lzo_swd_p const swd = (lzo_swd_p) wrkmem;
- int r;
-
- lzo_uint32 b = 0; /* bit buffer */
- unsigned k = 0; /* bits in bit buffer */
-
- /* sanity check */
- LZO_COMPILE_TIME_ASSERT(LZO2A_999_MEM_COMPRESS >= SIZEOF_LZO_SWD_T)
-
- c->init = 0;
- c->ip = c->in = in;
- c->in_end = in + in_len;
- c->cb = cb;
- c->m1 = c->m2 = c->m3 = c->m4 = 0;
-
- op = out;
-
- r = init_match(c,swd,NULL,0,0);
- if (r != 0)
- return r;
- if (max_chain > 0)
- swd->max_chain = max_chain;
-
- r = find_match(c,swd,0,0);
- if (r != 0)
- return r;
- while (c->look > 0)
- {
- lzo_uint lazy_match_min_gain = 0;
-#if (SWD_N >= 8192)
- lzo_uint extra1 = 0;
-#endif
- lzo_uint extra2 = 0;
- lzo_uint ahead = 0;
-
- m_len = c->m_len;
- m_off = c->m_off;
-
-#if (SWD_N >= 8192)
- if (m_off >= 8192)
- {
- if (m_len < M3_MIN_LEN)
- m_len = 0;
- else
- lazy_match_min_gain = 1;
- }
- else
-#endif
- if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
- {
- lazy_match_min_gain = 2;
-#if (SWD_N >= 8192)
- extra1 = 3;
-#endif
- extra2 = 2;
- }
- else if (m_len >= 10)
- lazy_match_min_gain = 1;
- else if (m_len >= 3)
- {
- lazy_match_min_gain = 1;
-#if (SWD_N >= 8192)
- extra1 = 1;
-#endif
- }
- else
- m_len = 0;
-
-
- /* try a lazy match */
- if (lazy_match_min_gain > 0 && c->look > m_len)
- {
- unsigned char lit = LZO_BYTE(swd->b_char);
-
- r = find_match(c,swd,1,0);
- assert(r == 0); LZO_UNUSED(r);
- assert(c->look > 0);
-
-#if (SWD_N >= 8192)
- if (m_off < 8192 && c->m_off >= 8192)
- lazy_match_min_gain += extra1;
- else
-#endif
- if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
- {
- if (!(c->m_len >= M1_MIN_LEN &&
- c->m_len <= M1_MAX_LEN && c->m_off <= 256))
- lazy_match_min_gain += extra2;
- }
- if (c->m_len >= M1_MIN_LEN &&
- c->m_len <= M1_MAX_LEN && c->m_off <= 256)
- {
- lazy_match_min_gain -= 1;
- }
-
- if ((lzo_int) lazy_match_min_gain < 1)
- lazy_match_min_gain = 1;
-
- if (c->m_len >= m_len + lazy_match_min_gain)
- {
- c->lazy++;
-#if !defined(NDEBUG)
- m_len = c->m_len;
- m_off = c->m_off;
- assert(lzo_memcmp(c->ip - c->look, c->ip - c->look - m_off,
- m_len) == 0);
- assert(m_len >= 3 || (m_len >= 2 && m_off <= 256));
-#endif
- /* code literal */
- putbit(0);
- putbyte(lit);
- c->lit_bytes++;
- continue;
- }
- else
- ahead = 1;
- assert(m_len > 0);
- }
-
-
- if (m_len == 0)
- {
- /* a literal */
- putbit(0);
- putbyte(swd->b_char);
- c->lit_bytes++;
- r = find_match(c,swd,1,0);
- assert(r == 0); LZO_UNUSED(r);
- }
- else
- {
- assert(m_len >= M1_MIN_LEN);
- assert(m_off > 0);
- assert(m_off <= SWD_N);
-
- /* 2 - code match */
- if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
- {
- putbit(1);
- putbit(0);
- putbits(2,m_len - M1_MIN_LEN);
- putbyte(m_off - 1);
- c->m1++;
- }
-#if (SWD_N >= 8192)
- else if (m_off >= 8192)
- {
- unsigned len = m_len;
- assert(m_len >= M3_MIN_LEN);
- putbit(1);
- putbit(1);
- putbyte(m_off & 31);
- putbyte(m_off >> 5);
- putbit(1);
- len -= M3_MIN_LEN - 1;
- while (len > 255)
- {
- len -= 255;
- putbyte(0);
- }
- putbyte(len);
- c->m4++;
- }
-#endif
- else
- {
- assert(m_len >= 3);
-
- putbit(1);
- putbit(1);
- if (m_len <= 9)
- {
- putbyte(((m_len - 2) << 5) | (m_off & 31));
- putbyte(m_off >> 5);
- c->m2++;
- }
- else
- {
- lzo_uint len = m_len;
- putbyte(m_off & 31);
- putbyte(m_off >> 5);
-#if (SWD_N >= 8192)
- putbit(0);
-#endif
- len -= 10 - 1;
- while (len > 255)
- {
- len -= 255;
- putbyte(0);
- }
- putbyte(len);
- c->m3++;
- }
- }
- r = find_match(c,swd,m_len,1+ahead);
- assert(r == 0); LZO_UNUSED(r);
- }
-
- c->codesize = pd(op, out);
- }
-
-#if defined(LZO_EOF_CODE)
- /* code EOF code */
- putbit(1);
- putbit(1);
- putbyte(1 << 5);
- putbyte(0);
-#endif
-
- /* flush remaining bits */
- assert(k < CHAR_BIT);
- if (k > 0)
- {
- assert(b == MASKBITS(k));
- assert(op - bitp > 1);
- *bitp = LZO_BYTE(MASKBITS(k));
- DUMPBITS(k);
- assert(b == 0);
- assert(k == 0);
- }
-
- assert(c->textsize == in_len);
- c->codesize = pd(op, out);
-
- *out_len = pd(op, out);
-
- if (c->cb && c->cb->nprogress)
- (*c->cb->nprogress)(c->cb, c->textsize, c->codesize, 0);
-
-#if 0
- printf("%ld -> %ld: %ld %ld %ld %ld %ld %ld\n",
- (long) c->textsize, (long) c->codesize,
- c->lit_bytes, c->m1, c->m2, c->m3, c->m4, c->lazy);
-#endif
- return LZO_E_OK;
-}
-
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-LZO_PUBLIC(int)
-lzo2a_999_compress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- return lzo2a_999_compress_callback(in,in_len,out,out_len,wrkmem,
- (lzo_callback_p) 0, 0);
-}
-
-
-/*
-vi:ts=4:et
-*/
-
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