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diff --git a/lzo/src/lzo_swd.ch b/lzo/src/lzo_swd.ch
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-/* lzo_swd.ch -- sliding window dictionary
-
- 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/
- */
-
-
-#if (LZO_UINT_MAX < LZO_0xffffffffL)
-# error "LZO_UINT_MAX"
-#endif
-#if defined(LZO_DEBUG)
-# include <stdio.h>
-#endif
-#if defined(__LZO_CHECKER)
-# include <stdlib.h>
-#endif
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-/* unsigned type for dictionary access - don't waste memory here */
-#if (0UL + SWD_N + SWD_F + SWD_F < 0UL + USHRT_MAX)
- typedef unsigned short swd_uint;
-# define SWD_UINT_MAX USHRT_MAX
-#elif (0UL + SWD_N + SWD_F + SWD_F < 0UL + UINT_MAX)
- typedef unsigned swd_uint;
-# define SWD_UINT_MAX UINT_MAX
-#else
- typedef lzo_uint swd_uint;
-# define SWD_UINT_MAX LZO_UINT_MAX
-#endif
-#define swd_uintp swd_uint __LZO_MMODEL *
-#define SWD_UINT(x) ((swd_uint)(x))
-
-
-#ifndef SWD_HSIZE
-# define SWD_HSIZE 16384
-#endif
-#ifndef SWD_MAX_CHAIN
-# define SWD_MAX_CHAIN 2048
-#endif
-
-#if !defined(HEAD3)
-#if 1
-# define HEAD3(b,p) \
- ((DMUL(0x9f5f,(((((lzo_xint)b[p]<<5)^b[p+1])<<5)^b[p+2]))>>5) & (SWD_HSIZE-1))
-#else
-# define HEAD3(b,p) \
- ((DMUL(0x9f5f,(((((lzo_xint)b[p+2]<<5)^b[p+1])<<5)^b[p]))>>5) & (SWD_HSIZE-1))
-#endif
-#endif
-
-#if !(SWD_NO_HEAD2) && (SWD_THRESHOLD == 1) && !defined(HEAD2)
-# if 1 && defined(LZO_UNALIGNED_OK_2)
-# define HEAD2(b,p) UA_GET16((b)+(p))
-# else
-# define HEAD2(b,p) (b[p] ^ ((unsigned)b[p+1]<<8))
-# endif
-# define NIL2 SWD_UINT_MAX
-#endif
-#ifndef IF_HEAD2
-#define IF_HEAD2(s) /*empty*/
-#endif
-
-
-typedef struct
-{
-/* public - "built-in" */
- lzo_uint swd_n;
- lzo_uint swd_f;
- lzo_uint swd_threshold;
-
-/* public - configuration */
- lzo_uint max_chain;
- lzo_uint nice_length;
- lzo_bool use_best_off;
- lzo_uint lazy_insert;
-
-/* public - output */
- lzo_uint m_len;
- lzo_uint m_off;
- lzo_uint look;
- int b_char;
-#if defined(SWD_BEST_OFF)
- lzo_uint best_off[ SWD_BEST_OFF ];
-#endif
-
-/* semi public */
- LZO_COMPRESS_T *c;
- lzo_uint m_pos;
-#if defined(SWD_BEST_OFF)
- lzo_uint best_pos[ SWD_BEST_OFF ];
-#endif
-
-/* private */
- const lzo_bytep dict;
- const lzo_bytep dict_end;
- lzo_uint dict_len;
-
-/* private */
- lzo_uint ip; /* input pointer (lookahead) */
- lzo_uint bp; /* buffer pointer */
- lzo_uint rp; /* remove pointer */
- lzo_uint b_size;
-
- lzo_bytep b_wrap;
-
- lzo_uint node_count;
- lzo_uint first_rp;
-
-#if defined(__LZO_MMODEL_HUGE)
-# define A(type, n) ((((n) * sizeof(type)) + 3UL) &~ 3UL)
-
-# define O_b(s) (0L)
-# define O_head3(s) (O_b(s) + A(char, 0UL + SWD_N + SWD_F + SWD_F))
-# define O_succ3(s) (O_head3(s) + A(swd_uint, 0UL + SWD_HSIZE))
-# define O_best3(s) (O_succ3(s) + A(swd_uint, 0UL + SWD_N + SWD_F))
-# define O_llen3(s) (O_best3(s) + A(swd_uint, 0UL + SWD_N + SWD_F))
-# ifdef HEAD2
-# define O_head2(s) (O_llen3(s) + A(swd_uint, 0UL + SWD_HSIZE))
-# define O_END(s) (O_head2(s) + A(swd_uint, 0UL + 65536L))
-# else
-# define O_END(s) (O_llen3(s) + A(swd_uint, 0UL + SWD_HSIZE))
-# endif
-
-# define S_DEF(s,type,off) ((type) ((lzo_bytep)s + 0L + sizeof(*s) + off))
-# define s_b(s) S_DEF(s, lzo_bytep, O_b(s))
-# define s_head3(s) S_DEF(s, swd_uintp, O_head3(s))
-# define s_succ3(s) S_DEF(s, swd_uintp, O_succ3(s))
-# define s_best3(s) S_DEF(s, swd_uintp, O_best3(s))
-# define s_llen3(s) S_DEF(s, swd_uintp, O_llen3(s))
-# ifdef HEAD2
-# define s_head2(s) S_DEF(s, swd_uintp, O_head2(s))
-# endif
-
-#elif defined(__LZO_CHECKER)
- /* malloc arrays of the exact size to detect any overrun */
- unsigned char *b;
- swd_uint *head3;
- swd_uint *succ3;
- swd_uint *best3;
- swd_uint *llen3;
-# ifdef HEAD2
- swd_uint *head2;
-# endif
-
-#else
- unsigned char b [ SWD_N + SWD_F + SWD_F ];
- swd_uint head3 [ SWD_HSIZE ];
- swd_uint succ3 [ SWD_N + SWD_F ];
- swd_uint best3 [ SWD_N + SWD_F ];
- swd_uint llen3 [ SWD_HSIZE ];
-# ifdef HEAD2
- swd_uint head2 [ 65536L ];
-# endif
-#endif
-}
-lzo_swd_t;
-#define lzo_swd_p lzo_swd_t __LZO_MMODEL *
-
-
-#if defined(__LZO_MMODEL_HUGE)
-#define SIZEOF_LZO_SWD_T O_END(0)
-#else
-#define s_b(s) s->b
-#define s_head3(s) s->head3
-#define s_succ3(s) s->succ3
-#define s_best3(s) s->best3
-#define s_llen3(s) s->llen3
-#ifdef HEAD2
-#define s_head2(s) s->head2
-#endif
-#define SIZEOF_LZO_SWD_T (sizeof(lzo_swd_t))
-#endif
-
-
-/* Access macro for head3.
- * head3[key] may be uninitialized if the list is emtpy,
- * but then its value will never be used.
- */
-#if defined(__LZO_CHECKER)
-# define s_get_head3(s,key) \
- ((s_llen3(s)[key] == 0) ? SWD_UINT_MAX : s_head3(s)[key])
-#else
-# define s_get_head3(s,key) s_head3(s)[key]
-#endif
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static
-void swd_initdict(lzo_swd_p s, const lzo_bytep dict, lzo_uint dict_len)
-{
- s->dict = s->dict_end = NULL;
- s->dict_len = 0;
-
- if (!dict || dict_len == 0)
- return;
- if (dict_len > s->swd_n)
- {
- dict += dict_len - s->swd_n;
- dict_len = s->swd_n;
- }
-
- s->dict = dict;
- s->dict_len = dict_len;
- s->dict_end = dict + dict_len;
- lzo_memcpy(s_b(s),dict,dict_len);
- s->ip = dict_len;
-}
-
-
-static
-void swd_insertdict(lzo_swd_p s, lzo_uint node, lzo_uint len)
-{
- lzo_uint key;
-
- s->node_count = s->swd_n - len;
- s->first_rp = node;
-
- if (len) do
- {
- key = HEAD3(s_b(s),node);
- s_succ3(s)[node] = s_get_head3(s,key);
- s_head3(s)[key] = SWD_UINT(node);
- s_best3(s)[node] = SWD_UINT(s->swd_f + 1);
- s_llen3(s)[key]++;
- assert(s_llen3(s)[key] <= s->swd_n);
-
-#ifdef HEAD2
- IF_HEAD2(s) {
- key = HEAD2(s_b(s),node);
- s_head2(s)[key] = SWD_UINT(node);
- }
-#endif
-
- node++;
- }
- while (--len != 0);
-}
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static
-int swd_init(lzo_swd_p s, const lzo_bytep dict, lzo_uint dict_len)
-{
-#if defined(__LZO_CHECKER)
- s->b = (lzo_bytep) malloc(SWD_N + SWD_F + SWD_F);
- s->head3 = (swd_uintp) malloc(sizeof(swd_uint) * SWD_HSIZE);
- s->succ3 = (swd_uintp) malloc(sizeof(swd_uint) * (SWD_N + SWD_F));
- s->best3 = (swd_uintp) malloc(sizeof(swd_uint) * (SWD_N + SWD_F));
- s->llen3 = (swd_uintp) malloc(sizeof(swd_uint) * SWD_HSIZE);
-#ifdef HEAD2
- IF_HEAD2(s) {
- s->head2 = (swd_uintp) malloc(sizeof(swd_uint) * 65536L);
- }
-#endif
-#endif
-
- s->m_len = 0;
- s->m_off = 0;
-#if defined(SWD_BEST_OFF)
- {
- unsigned i;
- for (i = 0; i < SWD_BEST_OFF; i++)
- s->best_off[i] = s->best_pos[i] = 0;
- }
-#endif
-
- s->swd_n = SWD_N;
- s->swd_f = SWD_F;
- s->swd_threshold = SWD_THRESHOLD;
-
- /* defaults */
- s->max_chain = SWD_MAX_CHAIN;
- s->nice_length = s->swd_f;
- s->use_best_off = 0;
- s->lazy_insert = 0;
-
- s->b_size = s->swd_n + s->swd_f;
-#if 0
- if (2 * s->swd_f >= s->swd_n || s->b_size + s->swd_f >= SWD_UINT_MAX)
- return LZO_E_ERROR;
-#else
- LZO_COMPILE_TIME_ASSERT(!(0ul + 2 * SWD_F >= SWD_N))
- LZO_COMPILE_TIME_ASSERT(!(0ul + SWD_N + SWD_F + SWD_F >= SWD_UINT_MAX))
-#endif
- s->b_wrap = s_b(s) + s->b_size;
- s->node_count = s->swd_n;
-
- lzo_memset(s_llen3(s), 0, (lzo_uint)sizeof(s_llen3(s)[0]) * (lzo_uint)SWD_HSIZE);
-#ifdef HEAD2
- IF_HEAD2(s) {
-#if 1
- lzo_memset(s_head2(s), 0xff, (lzo_uint)sizeof(s_head2(s)[0]) * 65536L);
- assert(s_head2(s)[0] == NIL2);
-#else
- lzo_uint32 i;
- for (i = 0; i < 65536L; i++)
- s_head2(s)[i] = NIL2;
-#endif
- }
-#endif
-
- s->ip = 0;
- swd_initdict(s,dict,dict_len);
- s->bp = s->ip;
- s->first_rp = s->ip;
-
- assert(s->ip + s->swd_f <= s->b_size);
-#if 1
- s->look = (lzo_uint) (s->c->in_end - s->c->ip);
- if (s->look > 0)
- {
- if (s->look > s->swd_f)
- s->look = s->swd_f;
- lzo_memcpy(&s_b(s)[s->ip],s->c->ip,s->look);
- s->c->ip += s->look;
- s->ip += s->look;
- }
-#else
- s->look = 0;
- while (s->look < s->swd_f)
- {
- int c;
- if ((c = getbyte(*(s->c))) < 0)
- break;
- s_b(s)[s->ip] = LZO_BYTE(c);
- s->ip++;
- s->look++;
- }
-#endif
- if (s->ip == s->b_size)
- s->ip = 0;
-
- if (s->look >= 2 && s->dict_len > 0)
- swd_insertdict(s,0,s->dict_len);
-
- s->rp = s->first_rp;
- if (s->rp >= s->node_count)
- s->rp -= s->node_count;
- else
- s->rp += s->b_size - s->node_count;
-
-#if 1 || defined(__LZO_CHECKER)
- /* initialize memory for the first few HEAD3 (if s->ip is not far
- * enough ahead to do this job for us). The value doesn't matter. */
- if (s->look < 3) {
- lzo_bytep p = &s_b(s)[s->bp+s->look];
- p[0] = p[1] = p[2] = 0;
- }
-#endif
-
- return LZO_E_OK;
-}
-
-
-static
-void swd_exit(lzo_swd_p s)
-{
-#if defined(__LZO_CHECKER)
- /* free in reverse order of allocations */
-#ifdef HEAD2
- free(s->head2); s->head2 = NULL;
-#endif
- free(s->llen3); s->llen3 = NULL;
- free(s->best3); s->best3 = NULL;
- free(s->succ3); s->succ3 = NULL;
- free(s->head3); s->head3 = NULL;
- free(s->b); s->b = NULL;
-#else
- LZO_UNUSED(s);
-#endif
-}
-
-
-#define swd_pos2off(s,pos) \
- (s->bp > (pos) ? s->bp - (pos) : s->b_size - ((pos) - s->bp))
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static __lzo_inline
-void swd_getbyte(lzo_swd_p s)
-{
- int c;
-
- if ((c = getbyte(*(s->c))) < 0)
- {
- if (s->look > 0)
- --s->look;
-#if defined(__LZO_CHECKER)
- /* initialize memory - value doesn't matter */
- s_b(s)[s->ip] = 0;
- if (s->ip < s->swd_f)
- s->b_wrap[s->ip] = 0;
-#endif
- }
- else
- {
- s_b(s)[s->ip] = LZO_BYTE(c);
- if (s->ip < s->swd_f)
- s->b_wrap[s->ip] = LZO_BYTE(c);
- }
- if (++s->ip == s->b_size)
- s->ip = 0;
- if (++s->bp == s->b_size)
- s->bp = 0;
- if (++s->rp == s->b_size)
- s->rp = 0;
-}
-
-
-/***********************************************************************
-// remove node from lists
-************************************************************************/
-
-static __lzo_inline
-void swd_remove_node(lzo_swd_p s, lzo_uint node)
-{
- if (s->node_count == 0)
- {
- lzo_uint key;
-
-#ifdef LZO_DEBUG
- if (s->first_rp != LZO_UINT_MAX)
- {
- if (node != s->first_rp)
- printf("Remove %5ld: %5ld %5ld %5ld %5ld %6ld %6ld\n",
- (long)node, (long)s->rp, (long)s->ip, (long)s->bp,
- (long)s->first_rp, (long)(s->ip - node),
- (long)(s->ip - s->bp));
- assert(node == s->first_rp);
- s->first_rp = LZO_UINT_MAX;
- }
-#endif
-
- key = HEAD3(s_b(s),node);
- assert(s_llen3(s)[key] > 0);
- --s_llen3(s)[key];
-
-#ifdef HEAD2
- IF_HEAD2(s) {
- key = HEAD2(s_b(s),node);
- assert(s_head2(s)[key] != NIL2);
- if ((lzo_uint) s_head2(s)[key] == node)
- s_head2(s)[key] = NIL2;
- }
-#endif
- }
- else
- --s->node_count;
-}
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static
-void swd_accept(lzo_swd_p s, lzo_uint n)
-{
- assert(n <= s->look);
-
- if (n) do
- {
- lzo_uint key;
-
- swd_remove_node(s,s->rp);
-
- /* add bp into HEAD3 */
- key = HEAD3(s_b(s),s->bp);
- s_succ3(s)[s->bp] = s_get_head3(s,key);
- s_head3(s)[key] = SWD_UINT(s->bp);
- s_best3(s)[s->bp] = SWD_UINT(s->swd_f + 1);
- s_llen3(s)[key]++;
- assert(s_llen3(s)[key] <= s->swd_n);
-
-#ifdef HEAD2
- /* add bp into HEAD2 */
- IF_HEAD2(s) {
- key = HEAD2(s_b(s),s->bp);
- s_head2(s)[key] = SWD_UINT(s->bp);
- }
-#endif
-
- swd_getbyte(s);
- } while (--n != 0);
-}
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static
-void swd_search(lzo_swd_p s, lzo_uint node, lzo_uint cnt)
-{
- const lzo_bytep p1;
- const lzo_bytep p2;
- const lzo_bytep px;
- lzo_uint m_len = s->m_len;
- const lzo_bytep b = s_b(s);
- const lzo_bytep bp = s_b(s) + s->bp;
- const lzo_bytep bx = s_b(s) + s->bp + s->look;
- unsigned char scan_end1;
-
- assert(s->m_len > 0);
-
- scan_end1 = bp[m_len - 1];
- for ( ; cnt-- > 0; node = s_succ3(s)[node])
- {
- p1 = bp;
- p2 = b + node;
- px = bx;
-
- assert(m_len < s->look);
-
- if (
-#if 1
- p2[m_len - 1] == scan_end1 &&
- p2[m_len] == p1[m_len] &&
-#endif
- p2[0] == p1[0] &&
- p2[1] == p1[1])
- {
- lzo_uint i;
- assert(lzo_memcmp(bp,&b[node],3) == 0);
-
-#if 0 && defined(LZO_UNALIGNED_OK_4)
- p1 += 3; p2 += 3;
- while (p1 + 4 <= px && UA_GET32(p1) == UA_GET32(p2))
- p1 += 4, p2 += 4;
- while (p1 < px && *p1 == *p2)
- p1 += 1, p2 += 1;
-#else
- p1 += 2; p2 += 2;
- do {} while (++p1 < px && *p1 == *++p2);
-#endif
- i = pd(p1, bp);
-
-#ifdef LZO_DEBUG
- if (lzo_memcmp(bp,&b[node],i) != 0)
- printf("%5ld %5ld %5ld %02x/%02x %02x/%02x\n",
- (long)s->bp, (long) node, (long) i,
- bp[0], bp[1], b[node], b[node+1]);
-#endif
- assert(lzo_memcmp(bp,&b[node],i) == 0);
-
-#if defined(SWD_BEST_OFF)
- if (i < SWD_BEST_OFF)
- {
- if (s->best_pos[i] == 0)
- s->best_pos[i] = node + 1;
- }
-#endif
- if (i > m_len)
- {
- s->m_len = m_len = i;
- s->m_pos = node;
- if (m_len == s->look)
- return;
- if (m_len >= s->nice_length)
- return;
- if (m_len > (lzo_uint) s_best3(s)[node])
- return;
- scan_end1 = bp[m_len - 1];
- }
- }
- }
-}
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-#ifdef HEAD2
-
-static
-lzo_bool swd_search2(lzo_swd_p s)
-{
- lzo_uint key;
-
- assert(s->look >= 2);
- assert(s->m_len > 0);
-
- key = s_head2(s)[ HEAD2(s_b(s),s->bp) ];
- if (key == NIL2)
- return 0;
-#ifdef LZO_DEBUG
- if (lzo_memcmp(&s_b(s)[s->bp],&s_b(s)[key],2) != 0)
- printf("%5ld %5ld %02x/%02x %02x/%02x\n", (long)s->bp, (long)key,
- s_b(s)[s->bp], s_b(s)[s->bp+1], s_b(s)[key], s_b(s)[key+1]);
-#endif
- assert(lzo_memcmp(&s_b(s)[s->bp],&s_b(s)[key],2) == 0);
-#if defined(SWD_BEST_OFF)
- if (s->best_pos[2] == 0)
- s->best_pos[2] = key + 1;
-#endif
-
- if (s->m_len < 2)
- {
- s->m_len = 2;
- s->m_pos = key;
- }
- return 1;
-}
-
-#endif
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static
-void swd_findbest(lzo_swd_p s)
-{
- lzo_uint key;
- lzo_uint cnt, node;
- lzo_uint len;
-
- assert(s->m_len > 0);
-
- /* get current head, add bp into HEAD3 */
- key = HEAD3(s_b(s),s->bp);
- node = s_succ3(s)[s->bp] = s_get_head3(s,key);
- cnt = s_llen3(s)[key]++;
- assert(s_llen3(s)[key] <= s->swd_n + s->swd_f);
- if (cnt > s->max_chain && s->max_chain > 0)
- cnt = s->max_chain;
- s_head3(s)[key] = SWD_UINT(s->bp);
-
- s->b_char = s_b(s)[s->bp];
- len = s->m_len;
- if (s->m_len >= s->look)
- {
- if (s->look == 0)
- s->b_char = -1;
- s->m_off = 0;
- s_best3(s)[s->bp] = SWD_UINT(s->swd_f + 1);
- }
- else
- {
-#if defined(HEAD2)
- if (swd_search2(s) && s->look >= 3)
- swd_search(s,node,cnt);
-#else
- if (s->look >= 3)
- swd_search(s,node,cnt);
-#endif
- if (s->m_len > len)
- s->m_off = swd_pos2off(s,s->m_pos);
- s_best3(s)[s->bp] = SWD_UINT(s->m_len);
-
-#if defined(SWD_BEST_OFF)
- if (s->use_best_off)
- {
- unsigned i;
- for (i = 2; i < SWD_BEST_OFF; i++)
- if (s->best_pos[i] > 0)
- s->best_off[i] = swd_pos2off(s,s->best_pos[i]-1);
- else
- s->best_off[i] = 0;
- }
-#endif
- }
-
- swd_remove_node(s,s->rp);
-
-#ifdef HEAD2
- /* add bp into HEAD2 */
- IF_HEAD2(s) {
- key = HEAD2(s_b(s),s->bp);
- s_head2(s)[key] = SWD_UINT(s->bp);
- }
-#endif
-}
-
-
-#undef HEAD3
-#undef HEAD2
-#undef IF_HEAD2
-#undef s_get_head3
-
-
-/*
-vi:ts=4:et
-*/
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 19:48:43 +0000