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diff --git a/lzo/src/lzo1x_d.ch b/lzo/src/lzo1x_d.ch
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-/* lzo1x_d.ch -- implementation of the LZO1X decompression 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 "lzo1_d.ch"
-
-
-/***********************************************************************
-// decompress a block of data.
-************************************************************************/
-
-#if defined(DO_DECOMPRESS)
-LZO_PUBLIC(int)
-DO_DECOMPRESS ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-#endif
-{
- register lzo_bytep op;
- register const lzo_bytep ip;
- register lzo_uint t;
-#if defined(COPY_DICT)
- lzo_uint m_off;
- const lzo_bytep dict_end;
-#else
- register const lzo_bytep m_pos;
-#endif
-
- const lzo_bytep const ip_end = in + in_len;
-#if defined(HAVE_ANY_OP)
- lzo_bytep const op_end = out + *out_len;
-#endif
-#if defined(LZO1Z)
- lzo_uint last_m_off = 0;
-#endif
-
- LZO_UNUSED(wrkmem);
-
-#if defined(COPY_DICT)
- if (dict)
- {
- if (dict_len > M4_MAX_OFFSET)
- {
- dict += dict_len - M4_MAX_OFFSET;
- dict_len = M4_MAX_OFFSET;
- }
- dict_end = dict + dict_len;
- }
- else
- {
- dict_len = 0;
- dict_end = NULL;
- }
-#endif /* COPY_DICT */
-
- *out_len = 0;
-
- op = out;
- ip = in;
-
- if (*ip > 17)
- {
- t = *ip++ - 17;
- if (t < 4)
- goto match_next;
- assert(t > 0); NEED_OP(t); NEED_IP(t+1);
- do *op++ = *ip++; while (--t > 0);
- goto first_literal_run;
- }
-
- while (TEST_IP && TEST_OP)
- {
- t = *ip++;
- if (t >= 16)
- goto match;
- /* a literal run */
- if (t == 0)
- {
- NEED_IP(1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP(1);
- }
- t += 15 + *ip++;
- }
- /* copy literals */
- assert(t > 0); NEED_OP(t+3); NEED_IP(t+4);
-#if defined(LZO_UNALIGNED_OK_8) && defined(LZO_UNALIGNED_OK_4)
- t += 3;
- if (t >= 8) do
- {
- UA_COPY64(op,ip);
- op += 8; ip += 8; t -= 8;
- } while (t >= 8);
- if (t >= 4)
- {
- UA_COPY32(op,ip);
- op += 4; ip += 4; t -= 4;
- }
- if (t > 0)
- {
- *op++ = *ip++;
- if (t > 1) { *op++ = *ip++; if (t > 2) { *op++ = *ip++; } }
- }
-#elif defined(LZO_UNALIGNED_OK_4) || defined(LZO_ALIGNED_OK_4)
-#if !defined(LZO_UNALIGNED_OK_4)
- if (PTR_ALIGNED2_4(op,ip))
- {
-#endif
- UA_COPY32(op,ip);
- op += 4; ip += 4;
- if (--t > 0)
- {
- if (t >= 4)
- {
- do {
- UA_COPY32(op,ip);
- op += 4; ip += 4; t -= 4;
- } while (t >= 4);
- if (t > 0) do *op++ = *ip++; while (--t > 0);
- }
- else
- do *op++ = *ip++; while (--t > 0);
- }
-#if !defined(LZO_UNALIGNED_OK_4)
- }
- else
-#endif
-#endif
-#if !defined(LZO_UNALIGNED_OK_4) && !defined(LZO_UNALIGNED_OK_8)
- {
- *op++ = *ip++; *op++ = *ip++; *op++ = *ip++;
- do *op++ = *ip++; while (--t > 0);
- }
-#endif
-
-
-first_literal_run:
-
-
- t = *ip++;
- if (t >= 16)
- goto match;
-#if defined(COPY_DICT)
-#if defined(LZO1Z)
- m_off = (1 + M2_MAX_OFFSET) + (t << 6) + (*ip++ >> 2);
- last_m_off = m_off;
-#else
- m_off = (1 + M2_MAX_OFFSET) + (t >> 2) + (*ip++ << 2);
-#endif
- NEED_OP(3);
- t = 3; COPY_DICT(t,m_off)
-#else /* !COPY_DICT */
-#if defined(LZO1Z)
- t = (1 + M2_MAX_OFFSET) + (t << 6) + (*ip++ >> 2);
- m_pos = op - t;
- last_m_off = t;
-#else
- m_pos = op - (1 + M2_MAX_OFFSET);
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
-#endif
- TEST_LB(m_pos); NEED_OP(3);
- *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos;
-#endif /* COPY_DICT */
- goto match_done;
-
-
- /* handle matches */
- do {
-match:
- if (t >= 64) /* a M2 match */
- {
-#if defined(COPY_DICT)
-#if defined(LZO1X)
- m_off = 1 + ((t >> 2) & 7) + (*ip++ << 3);
- t = (t >> 5) - 1;
-#elif defined(LZO1Y)
- m_off = 1 + ((t >> 2) & 3) + (*ip++ << 2);
- t = (t >> 4) - 3;
-#elif defined(LZO1Z)
- m_off = t & 0x1f;
- if (m_off >= 0x1c)
- m_off = last_m_off;
- else
- {
- m_off = 1 + (m_off << 6) + (*ip++ >> 2);
- last_m_off = m_off;
- }
- t = (t >> 5) - 1;
-#endif
-#else /* !COPY_DICT */
-#if defined(LZO1X)
- m_pos = op - 1;
- m_pos -= (t >> 2) & 7;
- m_pos -= *ip++ << 3;
- t = (t >> 5) - 1;
-#elif defined(LZO1Y)
- m_pos = op - 1;
- m_pos -= (t >> 2) & 3;
- m_pos -= *ip++ << 2;
- t = (t >> 4) - 3;
-#elif defined(LZO1Z)
- {
- lzo_uint off = t & 0x1f;
- m_pos = op;
- if (off >= 0x1c)
- {
- assert(last_m_off > 0);
- m_pos -= last_m_off;
- }
- else
- {
- off = 1 + (off << 6) + (*ip++ >> 2);
- m_pos -= off;
- last_m_off = off;
- }
- }
- t = (t >> 5) - 1;
-#endif
- TEST_LB(m_pos); assert(t > 0); NEED_OP(t+3-1);
- goto copy_match;
-#endif /* COPY_DICT */
- }
- else if (t >= 32) /* a M3 match */
- {
- t &= 31;
- if (t == 0)
- {
- NEED_IP(1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP(1);
- }
- t += 31 + *ip++;
- }
-#if defined(COPY_DICT)
-#if defined(LZO1Z)
- m_off = 1 + (ip[0] << 6) + (ip[1] >> 2);
- last_m_off = m_off;
-#else
- m_off = 1 + (ip[0] >> 2) + (ip[1] << 6);
-#endif
-#else /* !COPY_DICT */
-#if defined(LZO1Z)
- {
- lzo_uint off = 1 + (ip[0] << 6) + (ip[1] >> 2);
- m_pos = op - off;
- last_m_off = off;
- }
-#elif defined(LZO_UNALIGNED_OK_2) && defined(LZO_ABI_LITTLE_ENDIAN)
- m_pos = op - 1;
- m_pos -= UA_GET16(ip) >> 2;
-#else
- m_pos = op - 1;
- m_pos -= (ip[0] >> 2) + (ip[1] << 6);
-#endif
-#endif /* COPY_DICT */
- ip += 2;
- }
- else if (t >= 16) /* a M4 match */
- {
-#if defined(COPY_DICT)
- m_off = (t & 8) << 11;
-#else /* !COPY_DICT */
- m_pos = op;
- m_pos -= (t & 8) << 11;
-#endif /* COPY_DICT */
- t &= 7;
- if (t == 0)
- {
- NEED_IP(1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP(1);
- }
- t += 7 + *ip++;
- }
-#if defined(COPY_DICT)
-#if defined(LZO1Z)
- m_off += (ip[0] << 6) + (ip[1] >> 2);
-#else
- m_off += (ip[0] >> 2) + (ip[1] << 6);
-#endif
- ip += 2;
- if (m_off == 0)
- goto eof_found;
- m_off += 0x4000;
-#if defined(LZO1Z)
- last_m_off = m_off;
-#endif
-#else /* !COPY_DICT */
-#if defined(LZO1Z)
- m_pos -= (ip[0] << 6) + (ip[1] >> 2);
-#elif defined(LZO_UNALIGNED_OK_2) && defined(LZO_ABI_LITTLE_ENDIAN)
- m_pos -= UA_GET16(ip) >> 2;
-#else
- m_pos -= (ip[0] >> 2) + (ip[1] << 6);
-#endif
- ip += 2;
- if (m_pos == op)
- goto eof_found;
- m_pos -= 0x4000;
-#if defined(LZO1Z)
- last_m_off = pd((const lzo_bytep)op, m_pos);
-#endif
-#endif /* COPY_DICT */
- }
- else /* a M1 match */
- {
-#if defined(COPY_DICT)
-#if defined(LZO1Z)
- m_off = 1 + (t << 6) + (*ip++ >> 2);
- last_m_off = m_off;
-#else
- m_off = 1 + (t >> 2) + (*ip++ << 2);
-#endif
- NEED_OP(2);
- t = 2; COPY_DICT(t,m_off)
-#else /* !COPY_DICT */
-#if defined(LZO1Z)
- t = 1 + (t << 6) + (*ip++ >> 2);
- m_pos = op - t;
- last_m_off = t;
-#else
- m_pos = op - 1;
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
-#endif
- TEST_LB(m_pos); NEED_OP(2);
- *op++ = *m_pos++; *op++ = *m_pos;
-#endif /* COPY_DICT */
- goto match_done;
- }
-
- /* copy match */
-#if defined(COPY_DICT)
-
- NEED_OP(t+3-1);
- t += 3-1; COPY_DICT(t,m_off)
-
-#else /* !COPY_DICT */
-
- TEST_LB(m_pos); assert(t > 0); NEED_OP(t+3-1);
-#if defined(LZO_UNALIGNED_OK_8) && defined(LZO_UNALIGNED_OK_4)
- if (op - m_pos >= 8)
- {
- t += (3 - 1);
- if (t >= 8) do
- {
- UA_COPY64(op,m_pos);
- op += 8; m_pos += 8; t -= 8;
- } while (t >= 8);
- if (t >= 4)
- {
- UA_COPY32(op,m_pos);
- op += 4; m_pos += 4; t -= 4;
- }
- if (t > 0)
- {
- *op++ = m_pos[0];
- if (t > 1) { *op++ = m_pos[1]; if (t > 2) { *op++ = m_pos[2]; } }
- }
- }
- else
-#elif defined(LZO_UNALIGNED_OK_4) || defined(LZO_ALIGNED_OK_4)
-#if !defined(LZO_UNALIGNED_OK_4)
- if (t >= 2 * 4 - (3 - 1) && PTR_ALIGNED2_4(op,m_pos))
- {
- assert((op - m_pos) >= 4); /* both pointers are aligned */
-#else
- if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4)
- {
-#endif
- UA_COPY32(op,m_pos);
- op += 4; m_pos += 4; t -= 4 - (3 - 1);
- do {
- UA_COPY32(op,m_pos);
- op += 4; m_pos += 4; t -= 4;
- } while (t >= 4);
- if (t > 0) do *op++ = *m_pos++; while (--t > 0);
- }
- else
-#endif
- {
-copy_match:
- *op++ = *m_pos++; *op++ = *m_pos++;
- do *op++ = *m_pos++; while (--t > 0);
- }
-
-#endif /* COPY_DICT */
-
-match_done:
-#if defined(LZO1Z)
- t = ip[-1] & 3;
-#else
- t = ip[-2] & 3;
-#endif
- if (t == 0)
- break;
-
- /* copy literals */
-match_next:
- assert(t > 0); assert(t < 4); NEED_OP(t); NEED_IP(t+1);
-#if 0
- do *op++ = *ip++; while (--t > 0);
-#else
- *op++ = *ip++;
- if (t > 1) { *op++ = *ip++; if (t > 2) { *op++ = *ip++; } }
-#endif
- t = *ip++;
- } while (TEST_IP && TEST_OP);
- }
-
-#if defined(HAVE_TEST_IP) || defined(HAVE_TEST_OP)
- /* no EOF code was found */
- *out_len = pd(op, out);
- return LZO_E_EOF_NOT_FOUND;
-#endif
-
-eof_found:
- assert(t == 1);
- *out_len = pd(op, out);
- return (ip == ip_end ? LZO_E_OK :
- (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
-
-
-#if defined(HAVE_NEED_IP)
-input_overrun:
- *out_len = pd(op, out);
- return LZO_E_INPUT_OVERRUN;
-#endif
-
-#if defined(HAVE_NEED_OP)
-output_overrun:
- *out_len = pd(op, out);
- return LZO_E_OUTPUT_OVERRUN;
-#endif
-
-#if defined(LZO_TEST_OVERRUN_LOOKBEHIND)
-lookbehind_overrun:
- *out_len = pd(op, out);
- return LZO_E_LOOKBEHIND_OVERRUN;
-#endif
-}
-
-
-/*
-vi:ts=4:et
-*/
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 02:40:57 +0000