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-/* lzo1x_oo.ch -- LZO1X compressed data optimizer
-
- 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/
- */
-
-
-#define TEST_IP (ip < ip_end)
-#define TEST_OP (op <= op_end)
-
-#define NO_LIT LZO_UINT_MAX
-
-
-/***********************************************************************
-//
-************************************************************************/
-
-static void copy2(lzo_bytep ip, const lzo_bytep m_pos, lzo_uint off)
-{
- assert(off > 0);
- ip[0] = m_pos[0];
- if (off == 1)
- ip[1] = m_pos[0];
- else
- ip[1] = m_pos[1];
-}
-
-
-static void copy3(lzo_bytep ip, const lzo_bytep m_pos, lzo_uint off)
-{
- assert(off > 0);
- ip[0] = m_pos[0];
- if (off == 1)
- {
- ip[2] = ip[1] = m_pos[0];
- }
- else if (off == 2)
- {
- ip[1] = m_pos[1];
- ip[2] = m_pos[0];
- }
- else
- {
- ip[1] = m_pos[1];
- ip[2] = m_pos[2];
- }
-}
-
-
-/***********************************************************************
-// optimize a block of data.
-************************************************************************/
-
-LZO_PUBLIC(int)
-DO_OPTIMIZE ( lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- lzo_bytep op;
- lzo_bytep ip;
- lzo_uint t;
- lzo_bytep m_pos;
- lzo_bytep const ip_end = in + in_len;
- lzo_bytep const op_end = out + *out_len;
- lzo_bytep litp = NULL;
- lzo_uint lit = 0;
- lzo_uint next_lit = NO_LIT;
- lzo_uint nl;
- unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
-
- LZO_UNUSED(wrkmem);
-
- *out_len = 0;
-
- op = out;
- ip = in;
-
- assert(in_len >= 3);
- if (*ip > 17)
- {
- t = *ip++ - 17;
- if (t < 4)
- goto match_next;
- goto first_literal_run;
- }
- assert(*ip < 16 || (*ip == 17 && in_len == 3));
-
- while (TEST_IP && TEST_OP)
- {
- t = *ip++;
- if (t >= 16)
- goto match;
- /* a literal run */
- litp = ip - 1;
- if (t == 0)
- {
- t = 15;
- while (*ip == 0)
- t += 255, ip++;
- t += *ip++;
- }
- lit = t + 3;
- /* copy literals */
-copy_literal_run:
- *op++ = *ip++; *op++ = *ip++; *op++ = *ip++;
-first_literal_run:
- do *op++ = *ip++; while (--t > 0);
-
-
- t = *ip++;
-
- if (t >= 16)
- goto match;
-#if defined(LZO1X)
- m_pos = op - 1 - 0x800;
-#elif defined(LZO1Y)
- m_pos = op - 1 - 0x400;
-#endif
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
- *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
- lit = 0;
- goto match_done;
-
-
- /* handle matches */
- do {
- if (t < 16) /* a M1 match */
- {
- m_pos = op - 1;
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
-
- if (litp == NULL)
- goto copy_m1;
-
- /* assert that there was a match just before */
- assert(lit >= 1 && lit <= 3);
- assert(litp == ip - 2 - lit - 2);
- assert((lzo_uint)(*litp & 3) == lit);
- nl = ip[-2] & 3;
- /* test if a match follows */
- if (nl == 0 && lit == 1 && ip[0] >= 16)
- {
- next_lit = nl;
- /* adjust length of previous short run */
- lit += 2;
- *litp = LZO_BYTE((*litp & ~3) | lit);
- /* copy over the 2 literals that replace the match */
- copy2(ip-2,m_pos,pd(op,m_pos));
- o_m1_a++;
- }
- /* test if a literal run follows */
- else if (nl == 0 && ip[0] < 16 && ip[0] != 0 &&
- (lit + 2 + ip[0] < 16))
- {
- t = *ip++;
- /* remove short run */
- *litp &= ~3;
- /* copy over the 2 literals that replace the match */
- copy2(ip-3+1,m_pos,pd(op,m_pos));
- /* move literals 1 byte ahead */
- litp += 2;
- if (lit > 0)
- lzo_memmove(litp+1,litp,lit);
- /* insert new length of long literal run */
- lit += 2 + t + 3; assert(lit <= 18);
- *litp = LZO_BYTE(lit - 3);
-
- o_m1_b++;
- *op++ = *m_pos++; *op++ = *m_pos++;
- goto copy_literal_run;
- }
-copy_m1:
- *op++ = *m_pos++; *op++ = *m_pos++;
- }
- else
- {
-match:
- if (t >= 64) /* a M2 match */
- {
- m_pos = op - 1;
-#if defined(LZO1X)
- m_pos -= (t >> 2) & 7;
- m_pos -= *ip++ << 3;
- t = (t >> 5) - 1;
-#elif defined(LZO1Y)
- m_pos -= (t >> 2) & 3;
- m_pos -= *ip++ << 2;
- t = (t >> 4) - 3;
-#endif
- if (litp == NULL)
- goto copy_m;
-
- nl = ip[-2] & 3;
- /* test if in beetween two long literal runs */
- if (t == 1 && lit > 3 && nl == 0 &&
- ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16))
- {
- assert(*litp == lit - 3);
- t = *ip++;
- /* copy over the 3 literals that replace the match */
- copy3(ip-1-2,m_pos,pd(op,m_pos));
- /* set new length of previous literal run */
- lit += 3 + t + 3; assert(lit <= 18);
- *litp = LZO_BYTE(lit - 3);
- o_m2++;
- *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
- goto copy_literal_run;
- }
- }
- else
- {
- if (t >= 32) /* a M3 match */
- {
- t &= 31;
- if (t == 0)
- {
- t = 31;
- while (*ip == 0)
- t += 255, ip++;
- t += *ip++;
- }
- m_pos = op - 1;
- m_pos -= *ip++ >> 2;
- m_pos -= *ip++ << 6;
- }
- else /* a M4 match */
- {
- m_pos = op;
- m_pos -= (t & 8) << 11;
- t &= 7;
- if (t == 0)
- {
- t = 7;
- while (*ip == 0)
- t += 255, ip++;
- t += *ip++;
- }
- m_pos -= *ip++ >> 2;
- m_pos -= *ip++ << 6;
- if (m_pos == op)
- goto eof_found;
- m_pos -= 0x4000;
- }
- if (litp == NULL)
- goto copy_m;
-
- nl = ip[-2] & 3;
- /* test if in beetween two matches */
- if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16)
- {
- assert(litp == ip - 3 - lit - 2);
- assert((lzo_uint)(*litp & 3) == lit);
- next_lit = nl;
- /* make a previous short run */
- lit += 3;
- *litp = LZO_BYTE((*litp & ~3) | lit);
- /* copy over the 3 literals that replace the match */
- copy3(ip-3,m_pos,pd(op,m_pos));
- o_m3_a++;
- }
- /* test if a literal run follows */
- else if (t == 1 && lit <= 3 && nl == 0 &&
- ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16))
- {
- assert(litp == ip - 3 - lit - 2);
- assert((lzo_uint)(*litp & 3) == lit);
- t = *ip++;
- /* remove short run */
- *litp &= ~3;
- /* copy over the 3 literals that replace the match */
- copy3(ip-4+1,m_pos,pd(op,m_pos));
- /* move literals 1 byte ahead */
- litp += 2;
- if (lit > 0)
- lzo_memmove(litp+1,litp,lit);
- /* insert new length of long literal run */
- lit += 3 + t + 3; assert(lit <= 18);
- *litp = LZO_BYTE(lit - 3);
-
- o_m3_b++;
- *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
- goto copy_literal_run;
- }
- }
-copy_m:
- *op++ = *m_pos++; *op++ = *m_pos++;
- do *op++ = *m_pos++; while (--t > 0);
- }
-
-match_done:
- if (next_lit == NO_LIT)
- {
- t = ip[-2] & 3;
- lit = t;
- litp = ip - 2;
- }
- else
- t = next_lit;
- assert(t <= 3);
- next_lit = NO_LIT;
- if (t == 0)
- break;
- /* copy literals */
-match_next:
- do *op++ = *ip++; while (--t > 0);
- t = *ip++;
- } while (TEST_IP && TEST_OP);
- }
-
- /* no EOF code was found */
- *out_len = pd(op, out);
- return LZO_E_EOF_NOT_FOUND;
-
-eof_found:
- assert(t == 1);
-#if 0
- printf("optimize: %5lu %5lu %5lu %5lu %5lu\n",
- o_m1_a, o_m1_b, o_m2, o_m3_a, o_m3_b);
-#endif
- LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
- LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
- *out_len = pd(op, out);
- return (ip == ip_end ? LZO_E_OK :
- (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
-}
-
-
-/*
-vi:ts=4:et
-*/
-
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