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-rw-r--r--lzo/src/lzo1f_9x.c348
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diff --git a/lzo/src/lzo1f_9x.c b/lzo/src/lzo1f_9x.c
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-/* lzo1f_9x.c -- implementation of the LZO1F-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 "config1f.h"
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-#define SWD_N 16383 /* size of ring buffer */
-#define SWD_THRESHOLD 2 /* lower limit for match length */
-#define SWD_F 2048 /* upper limit for match length */
-
-
-#define LZO1F 1
-#define LZO_COMPRESS_T lzo1f_999_t
-#define lzo_swd_t lzo1f_999_swd_t
-#include "lzo_mchw.ch"
-
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static lzo_bytep
-code_match ( LZO_COMPRESS_T *c, lzo_bytep op, lzo_uint m_len, lzo_uint m_off )
-{
- if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
- {
- m_off -= 1;
- *op++ = LZO_BYTE(((m_len - 2) << 5) | ((m_off & 7) << 2));
- *op++ = LZO_BYTE(m_off >> 3);
- c->m2_m++;
- }
- else if (m_len == M2_MIN_LEN && m_off <= 2 * M2_MAX_OFFSET &&
- c->r1_lit > 0)
- {
- assert(m_off > M2_MAX_OFFSET);
- m_off -= 1 + M2_MAX_OFFSET;
- *op++ = LZO_BYTE(((m_off & 7) << 2));
- *op++ = LZO_BYTE(m_off >> 3);
- c->r1_r++;
- }
- else
- {
- if (m_len <= M3_MAX_LEN)
- *op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
- else
- {
- m_len -= M3_MAX_LEN;
- *op++ = M3_MARKER | 0;
- while (m_len > 255)
- {
- m_len -= 255;
- *op++ = 0;
- }
- assert(m_len > 0);
- *op++ = LZO_BYTE(m_len);
- }
- *op++ = LZO_BYTE((m_off & 63) << 2);
- *op++ = LZO_BYTE(m_off >> 6);
- c->m3_m++;
- }
-
- return op;
-}
-
-
-static lzo_bytep
-STORE_RUN ( lzo_bytep op, const lzo_bytep ii, lzo_uint t, lzo_bytep out )
-{
- if (t < 4 && op > out)
- op[-2] |= LZO_BYTE(t);
- else if (t <= 31)
- *op++ = LZO_BYTE(t);
- else
- {
- lzo_uint tt = t - 31;
-
- *op++ = 0;
- while (tt > 255)
- {
- tt -= 255;
- *op++ = 0;
- }
- assert(tt > 0);
- *op++ = LZO_BYTE(tt);
- }
- do *op++ = *ii++; while (--t > 0);
-
- return op;
-}
-
-
-/***********************************************************************
-// this is a public function, but there is no prototype in a header file
-************************************************************************/
-
-LZO_EXTERN(int)
-lzo1f_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)
-lzo1f_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;
- const lzo_bytep ii;
- lzo_uint lit;
- 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;
-
- /* sanity check */
- LZO_COMPILE_TIME_ASSERT(LZO1F_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->r1_r = c->m2_m = c->m3_m = 0;
-
- op = out;
- ii = c->ip; /* point to start of literal run */
- lit = 0;
- c->r1_lit = c->r1_m_len = 0;
-
- 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)
- {
- int lazy_match_min_gain = -1;
- lzo_uint ahead = 0;
-
- m_len = c->m_len;
- m_off = c->m_off;
-
- assert(c->ip - c->look >= in);
- if (lit == 0)
- ii = c->ip - c->look;
- assert(ii + lit == c->ip - c->look);
- assert(swd->b_char == *(c->ip - c->look));
-
- if ((m_len < M2_MIN_LEN) ||
- (m_len < M3_MIN_LEN && m_off > M2_MAX_OFFSET))
- {
- m_len = 0;
- }
- else
- {
- assert(c->ip - c->look - m_off >= in);
- assert(c->ip - c->look - m_off + m_len < c->ip);
- assert(lzo_memcmp(c->ip - c->look, c->ip - c->look - m_off,
- m_len) == 0);
-
- if (lit < 3)
- lazy_match_min_gain = 1;
- else if (lit == 3)
- lazy_match_min_gain = 3;
- else if (lit == 31)
- lazy_match_min_gain = 3;
- else
- lazy_match_min_gain = 1;
- }
-
- /* try a lazy match */
- if (m_len > 0 && lazy_match_min_gain >= 0 && c->look > m_len)
- {
- r = find_match(c,swd,1,0);
- assert(r == 0); LZO_UNUSED(r);
- assert(c->look > 0);
-
- if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET &&
- c->m_off > M2_MAX_OFFSET)
- {
- lazy_match_min_gain += 1;
- }
- else if (c->m_len <= M2_MAX_LEN &&
- c->m_off <= M2_MAX_OFFSET &&
- m_off > M2_MAX_OFFSET)
- {
- if (lazy_match_min_gain > 0)
- lazy_match_min_gain -= 1;
- }
- else if (m_len == M2_MIN_LEN && c->m_len == M2_MIN_LEN &&
- c->m_off <= 2 * M2_MAX_OFFSET &&
- m_off > M2_MAX_OFFSET)
- {
- if (lazy_match_min_gain > 0)
- 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);
-#endif
- lit++;
- assert(ii + lit == c->ip - c->look);
- continue;
- }
- else
- {
- ahead = 1;
- assert(ii + lit + 1 == c->ip - c->look);
- }
- assert(m_len > 0);
- }
- assert(ii + lit + ahead == c->ip - c->look);
-
-
- if (m_len == 0)
- {
- /* a literal */
- lit++;
- r = find_match(c,swd,1,0);
- assert(r == 0); LZO_UNUSED(r);
- }
- else
- {
- /* 1 - store run */
- if (lit > 0)
- {
- op = STORE_RUN(op,ii,lit,out);
- c->r1_m_len = m_len;
- c->r1_lit = lit;
- lit = 0;
- }
- else
- c->r1_lit = c->r1_m_len = 0;
-
- /* 2 - code match */
- op = code_match(c,op,m_len,m_off);
- r = find_match(c,swd,m_len,1+ahead);
- assert(r == 0); LZO_UNUSED(r);
- }
-
- c->codesize = pd(op, out);
- }
-
-
- /* store final run */
- if (lit > 0)
- op = STORE_RUN(op,ii,lit,out);
-
-#if defined(LZO_EOF_CODE)
- *op++ = M3_MARKER | 1;
- *op++ = 0;
- *op++ = 0;
-#endif
-
- c->codesize = pd(op, out);
- assert(c->textsize == in_len);
-
- *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\n",
- (long) c->textsize, (long)in_len, (long) c->codesize,
- c->r1_r, c->m2_m, c->m3_m, c->lazy);
-#endif
- return LZO_E_OK;
-}
-
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-LZO_PUBLIC(int)
-lzo1f_999_compress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- return lzo1f_999_compress_callback(in,in_len,out,out_len,wrkmem,
- (lzo_callback_p) 0, 0);
-}
-
-
-/*
-vi:ts=4:et
-*/
-
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