|
Packit Service |
5195f2 |
/* lzo1b_d.ch -- implementation of the LZO1B decompression algorithm
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
This file is part of the LZO real-time data compression library.
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
|
|
Packit Service |
5195f2 |
All Rights Reserved.
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
The LZO library is free software; you can redistribute it and/or
|
|
Packit Service |
5195f2 |
modify it under the terms of the GNU General Public License as
|
|
Packit Service |
5195f2 |
published by the Free Software Foundation; either version 2 of
|
|
Packit Service |
5195f2 |
the License, or (at your option) any later version.
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
The LZO library is distributed in the hope that it will be useful,
|
|
Packit Service |
5195f2 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit Service |
5195f2 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
Packit Service |
5195f2 |
GNU General Public License for more details.
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
You should have received a copy of the GNU General Public License
|
|
Packit Service |
5195f2 |
along with the LZO library; see the file COPYING.
|
|
Packit Service |
5195f2 |
If not, write to the Free Software Foundation, Inc.,
|
|
Packit Service |
5195f2 |
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
Markus F.X.J. Oberhumer
|
|
Packit Service |
5195f2 |
<markus@oberhumer.com>
|
|
Packit Service |
5195f2 |
http://www.oberhumer.com/opensource/lzo/
|
|
Packit Service |
5195f2 |
*/
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#include "lzo1_d.ch"
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/***********************************************************************
|
|
Packit Service |
5195f2 |
// decompress a block of data.
|
|
Packit Service |
5195f2 |
************************************************************************/
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
LZO_PUBLIC(int)
|
|
Packit Service |
5195f2 |
DO_DECOMPRESS ( const lzo_bytep in , lzo_uint in_len,
|
|
Packit Service |
5195f2 |
lzo_bytep out, lzo_uintp out_len,
|
|
Packit Service |
5195f2 |
lzo_voidp wrkmem )
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
lzo_bytep op;
|
|
Packit Service |
5195f2 |
const lzo_bytep ip;
|
|
Packit Service |
5195f2 |
lzo_uint t;
|
|
Packit Service |
5195f2 |
const lzo_bytep m_pos;
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
const lzo_bytep const ip_end = in + in_len;
|
|
Packit Service |
5195f2 |
#if defined(HAVE_ANY_OP)
|
|
Packit Service |
5195f2 |
lzo_bytep const op_end = out + *out_len;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
LZO_UNUSED(wrkmem);
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
op = out;
|
|
Packit Service |
5195f2 |
ip = in;
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
while (TEST_IP_AND_TEST_OP)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
t = *ip++; /* get marker */
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
if (t < R0MIN) /* a literal run */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
if (t == 0) /* a R0 literal run */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
NEED_IP(1);
|
|
Packit Service |
5195f2 |
t = *ip++;
|
|
Packit Service |
5195f2 |
if (t >= R0FAST - R0MIN) /* a long R0 run */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
t -= R0FAST - R0MIN;
|
|
Packit Service |
5195f2 |
if (t == 0)
|
|
Packit Service |
5195f2 |
t = R0FAST;
|
|
Packit Service |
5195f2 |
else
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
#if 0
|
|
Packit Service |
5195f2 |
t = 256u << ((unsigned) t);
|
|
Packit Service |
5195f2 |
#else
|
|
Packit Service |
5195f2 |
/* help the optimizer */
|
|
Packit Service |
5195f2 |
lzo_uint tt = 256;
|
|
Packit Service |
5195f2 |
do tt <<= 1; while (--t > 0);
|
|
Packit Service |
5195f2 |
t = tt;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
NEED_IP(t); NEED_OP(t);
|
|
Packit Service |
5195f2 |
#if 1 && (LZO_OPT_UNALIGNED32)
|
|
Packit Service |
5195f2 |
do {
|
|
Packit Service |
5195f2 |
UA_COPY4(op+0, ip+0);
|
|
Packit Service |
5195f2 |
UA_COPY4(op+4, ip+4);
|
|
Packit Service |
5195f2 |
op += 8; ip += 8;
|
|
Packit Service |
5195f2 |
t -= 8;
|
|
Packit Service |
5195f2 |
} while (t > 0);
|
|
Packit Service |
5195f2 |
#else
|
|
Packit Service |
5195f2 |
MEMCPY8_DS(op,ip,t);
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
continue;
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
t += R0MIN; /* a short R0 run */
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
NEED_IP(t); NEED_OP(t);
|
|
Packit Service |
5195f2 |
/* copy literal run */
|
|
Packit Service |
5195f2 |
#if 1 && (LZO_OPT_UNALIGNED32)
|
|
Packit Service |
5195f2 |
if (t >= 4)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
do {
|
|
Packit Service |
5195f2 |
UA_COPY4(op, ip);
|
|
Packit Service |
5195f2 |
op += 4; ip += 4; t -= 4;
|
|
Packit Service |
5195f2 |
} while (t >= 4);
|
|
Packit Service |
5195f2 |
if (t > 0) do *op++ = *ip++; while (--t > 0);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
else
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
#if (M3O_BITS < 7)
|
|
Packit Service |
5195f2 |
literal1:
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
do *op++ = *ip++; while (--t > 0);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if (M3O_BITS == 7)
|
|
Packit Service |
5195f2 |
literal2:
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/* after a literal a match must follow */
|
|
Packit Service |
5195f2 |
while (TEST_IP_AND_TEST_OP)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
t = *ip++; /* get R1 marker */
|
|
Packit Service |
5195f2 |
if (t >= R0MIN)
|
|
Packit Service |
5195f2 |
goto match;
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
NEED_IP(2); NEED_OP(M2_MIN_LEN + 1);
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/* R1 match - a M2_MIN_LEN match + 1 byte literal */
|
|
Packit Service |
5195f2 |
assert((t & M2O_MASK) == t);
|
|
Packit Service |
5195f2 |
m_pos = op - M2_MIN_OFFSET;
|
|
Packit Service |
5195f2 |
m_pos -= t | (((lzo_uint) *ip++) << M2O_BITS);
|
|
Packit Service |
5195f2 |
assert(m_pos >= out); assert(m_pos < op);
|
|
Packit Service |
5195f2 |
TEST_LB(m_pos);
|
|
Packit Service |
5195f2 |
COPY_M2;
|
|
Packit Service |
5195f2 |
*op++ = *ip++;
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if defined(HAVE_TEST_IP) || defined(HAVE_TEST_OP)
|
|
Packit Service |
5195f2 |
break;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
match:
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
if (t >= M2_MARKER) /* a M2 match */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
/* get match offset */
|
|
Packit Service |
5195f2 |
NEED_IP(1);
|
|
Packit Service |
5195f2 |
m_pos = op - M2_MIN_OFFSET;
|
|
Packit Service |
5195f2 |
m_pos -= (t & M2O_MASK) | (((lzo_uint) *ip++) << M2O_BITS);
|
|
Packit Service |
5195f2 |
assert(m_pos >= out); assert(m_pos < op);
|
|
Packit Service |
5195f2 |
TEST_LB(m_pos);
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/* get match len */
|
|
Packit Service |
5195f2 |
t = (t >> M2O_BITS) - 1;
|
|
Packit Service |
5195f2 |
NEED_OP(t + M2_MIN_LEN - 1);
|
|
Packit Service |
5195f2 |
COPY_M2X;
|
|
Packit Service |
5195f2 |
MEMCPY_DS(op,m_pos,t);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
else /* a M3 or M4 match */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
/* get match len */
|
|
Packit Service |
5195f2 |
t &= M3L_MASK;
|
|
Packit Service |
5195f2 |
if (t == 0) /* a M4 match */
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
NEED_IP(1);
|
|
Packit Service |
5195f2 |
while (*ip == 0)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
t += 255;
|
|
Packit Service |
5195f2 |
ip++;
|
|
Packit Service |
5195f2 |
TEST_OV(t);
|
|
Packit Service |
5195f2 |
NEED_IP(1);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
t += (M4_MIN_LEN - M3_MIN_LEN) + *ip++;
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/* get match offset */
|
|
Packit Service |
5195f2 |
NEED_IP(2);
|
|
Packit Service |
5195f2 |
m_pos = op - (M3_MIN_OFFSET - M3_EOF_OFFSET);
|
|
Packit Service |
5195f2 |
m_pos -= *ip++ & M3O_MASK;
|
|
Packit Service |
5195f2 |
m_pos -= (lzo_uint)(*ip++) << M3O_BITS;
|
|
Packit Service |
5195f2 |
#if defined(LZO_EOF_CODE)
|
|
Packit Service |
5195f2 |
if (m_pos == op)
|
|
Packit Service |
5195f2 |
goto eof_found;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/* copy match */
|
|
Packit Service |
5195f2 |
assert(m_pos >= out); assert(m_pos < op);
|
|
Packit Service |
5195f2 |
TEST_LB(m_pos); NEED_OP(t + M3_MIN_LEN - 1);
|
|
Packit Service |
5195f2 |
#if (LZO_OPT_UNALIGNED32)
|
|
Packit Service |
5195f2 |
if (t >= 2 * 4 - (M3_MIN_LEN - 1) && (op - m_pos) >= 4)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
UA_COPY4(op, m_pos);
|
|
Packit Service |
5195f2 |
op += 4; m_pos += 4; t -= 4 - (M3_MIN_LEN - 1);
|
|
Packit Service |
5195f2 |
do {
|
|
Packit Service |
5195f2 |
UA_COPY4(op, m_pos);
|
|
Packit Service |
5195f2 |
op += 4; m_pos += 4; t -= 4;
|
|
Packit Service |
5195f2 |
} while (t >= 4);
|
|
Packit Service |
5195f2 |
if (t > 0) do *op++ = *m_pos++; while (--t > 0);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
else
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
COPY_M3X;
|
|
Packit Service |
5195f2 |
MEMCPY_DS(op,m_pos,t);
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if (M3O_BITS < 7)
|
|
Packit Service |
5195f2 |
t = ip[-2] >> M3O_BITS;
|
|
Packit Service |
5195f2 |
if (t)
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
NEED_IP(t); NEED_OP(t);
|
|
Packit Service |
5195f2 |
goto literal1;
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
#elif (M3O_BITS == 7)
|
|
Packit Service |
5195f2 |
/* optimized version */
|
|
Packit Service |
5195f2 |
if (ip[-2] & (1 << M3O_BITS))
|
|
Packit Service |
5195f2 |
{
|
|
Packit Service |
5195f2 |
NEED_IP(1); NEED_OP(1);
|
|
Packit Service |
5195f2 |
*op++ = *ip++;
|
|
Packit Service |
5195f2 |
goto literal2;
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if defined(LZO_EOF_CODE)
|
|
Packit Service |
5195f2 |
#if defined(HAVE_TEST_IP) || defined(HAVE_TEST_OP)
|
|
Packit Service |
5195f2 |
/* no EOF code was found */
|
|
Packit Service |
5195f2 |
*out_len = pd(op, out);
|
|
Packit Service |
5195f2 |
return LZO_E_EOF_NOT_FOUND;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
eof_found:
|
|
Packit Service |
5195f2 |
assert(t == 1);
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
*out_len = pd(op, out);
|
|
Packit Service |
5195f2 |
return (ip == ip_end ? LZO_E_OK :
|
|
Packit Service |
5195f2 |
(ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if defined(HAVE_NEED_IP)
|
|
Packit Service |
5195f2 |
input_overrun:
|
|
Packit Service |
5195f2 |
*out_len = pd(op, out);
|
|
Packit Service |
5195f2 |
return LZO_E_INPUT_OVERRUN;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if defined(HAVE_NEED_OP)
|
|
Packit Service |
5195f2 |
output_overrun:
|
|
Packit Service |
5195f2 |
*out_len = pd(op, out);
|
|
Packit Service |
5195f2 |
return LZO_E_OUTPUT_OVERRUN;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
#if defined(LZO_TEST_OVERRUN_LOOKBEHIND)
|
|
Packit Service |
5195f2 |
lookbehind_overrun:
|
|
Packit Service |
5195f2 |
*out_len = pd(op, out);
|
|
Packit Service |
5195f2 |
return LZO_E_LOOKBEHIND_OVERRUN;
|
|
Packit Service |
5195f2 |
#endif
|
|
Packit Service |
5195f2 |
}
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
|
|
Packit Service |
5195f2 |
/*
|
|
Packit Service |
5195f2 |
vi:ts=4:et
|
|
Packit Service |
5195f2 |
*/
|
|
Packit Service |
5195f2 |
|