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/* lzo1x_c.ch -- implementation of the LZO1[XY]-1 compression algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 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 1 && defined(DO_COMPRESS) && !defined(do_compress)
/* choose a unique name to better help PGO optimizations */
# define do_compress LZO_PP_ECONCAT2(DO_COMPRESS,_core)
#endif
/***********************************************************************
// compress a block of data.
************************************************************************/
static __lzo_noinline lzo_uint
do_compress ( const lzo_bytep in , lzo_uint in_len,
lzo_bytep out, lzo_uintp out_len,
lzo_uint ti, lzo_voidp wrkmem)
{
const lzo_bytep ip;
lzo_bytep op;
const lzo_bytep const in_end = in + in_len;
const lzo_bytep const ip_end = in + in_len - 20;
const lzo_bytep ii;
lzo_dict_p const dict = (lzo_dict_p) wrkmem;
op = out;
ip = in;
ii = ip;
ip += ti < 4 ? 4 - ti : 0;
for (;;)
{
const lzo_bytep m_pos;
#if !(LZO_DETERMINISTIC)
LZO_DEFINE_UNINITIALIZED_VAR(lzo_uint, m_off, 0);
lzo_uint m_len;
lzo_uint dindex;
next:
if __lzo_unlikely(ip >= ip_end)
break;
DINDEX1(dindex,ip);
GINDEX(m_pos,m_off,dict,dindex,in);
if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET))
goto literal;
#if 1
if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
goto try_match;
DINDEX2(dindex,ip);
#endif
GINDEX(m_pos,m_off,dict,dindex,in);
if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET))
goto literal;
if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
goto try_match;
goto literal;
try_match:
#if (LZO_OPT_UNALIGNED32)
if (UA_GET_NE32(m_pos) != UA_GET_NE32(ip))
#else
if (m_pos[0] != ip[0] || m_pos[1] != ip[1] || m_pos[2] != ip[2] || m_pos[3] != ip[3])
#endif
{
/* a literal */
literal:
UPDATE_I(dict,0,dindex,ip,in);
ip += 1 + ((ip - ii) >> 5);
continue;
}
/*match:*/
UPDATE_I(dict,0,dindex,ip,in);
#else
lzo_uint m_off;
lzo_uint m_len;
{
lzo_uint32_t dv;
lzo_uint dindex;
literal:
ip += 1 + ((ip - ii) >> 5);
next:
if __lzo_unlikely(ip >= ip_end)
break;
dv = UA_GET_LE32(ip);
dindex = DINDEX(dv,ip);
GINDEX(m_off,m_pos,in+dict,dindex,in);
UPDATE_I(dict,0,dindex,ip,in);
if __lzo_unlikely(dv != UA_GET_LE32(m_pos))
goto literal;
}
#endif
/* a match */
ii -= ti; ti = 0;
{
lzo_uint t = pd(ip,ii);
if (t != 0)
{
if (t <= 3)
{
op[-2] = LZO_BYTE(op[-2] | t);
#if (LZO_OPT_UNALIGNED32)
UA_COPY4(op, ii);
op += t;
#else
{ do *op++ = *ii++; while (--t > 0); }
#endif
}
#if (LZO_OPT_UNALIGNED32) || (LZO_OPT_UNALIGNED64)
else if (t <= 16)
{
*op++ = LZO_BYTE(t - 3);
UA_COPY8(op, ii);
UA_COPY8(op+8, ii+8);
op += t;
}
#endif
else
{
if (t <= 18)
*op++ = LZO_BYTE(t - 3);
else
{
lzo_uint tt = t - 18;
*op++ = 0;
while __lzo_unlikely(tt > 255)
{
tt -= 255;
UA_SET1(op, 0);
op++;
}
assert(tt > 0);
*op++ = LZO_BYTE(tt);
}
#if (LZO_OPT_UNALIGNED32) || (LZO_OPT_UNALIGNED64)
do {
UA_COPY8(op, ii);
UA_COPY8(op+8, ii+8);
op += 16; ii += 16; t -= 16;
} while (t >= 16); if (t > 0)
#endif
{ do *op++ = *ii++; while (--t > 0); }
}
}
}
m_len = 4;
{
#if (LZO_OPT_UNALIGNED64)
lzo_uint64_t v;
v = UA_GET_NE64(ip + m_len) ^ UA_GET_NE64(m_pos + m_len);
if __lzo_unlikely(v == 0) {
do {
m_len += 8;
v = UA_GET_NE64(ip + m_len) ^ UA_GET_NE64(m_pos + m_len);
if __lzo_unlikely(ip + m_len >= ip_end)
goto m_len_done;
} while (v == 0);
}
#if (LZO_ABI_BIG_ENDIAN) && defined(lzo_bitops_ctlz64)
m_len += lzo_bitops_ctlz64(v) / CHAR_BIT;
#elif (LZO_ABI_BIG_ENDIAN)
if ((v >> (64 - CHAR_BIT)) == 0) do {
v <<= CHAR_BIT;
m_len += 1;
} while ((v >> (64 - CHAR_BIT)) == 0);
#elif (LZO_ABI_LITTLE_ENDIAN) && defined(lzo_bitops_cttz64)
m_len += lzo_bitops_cttz64(v) / CHAR_BIT;
#elif (LZO_ABI_LITTLE_ENDIAN)
if ((v & UCHAR_MAX) == 0) do {
v >>= CHAR_BIT;
m_len += 1;
} while ((v & UCHAR_MAX) == 0);
#else
if (ip[m_len] == m_pos[m_len]) do {
m_len += 1;
} while (ip[m_len] == m_pos[m_len]);
#endif
#elif (LZO_OPT_UNALIGNED32)
lzo_uint32_t v;
v = UA_GET_NE32(ip + m_len) ^ UA_GET_NE32(m_pos + m_len);
if __lzo_unlikely(v == 0) {
do {
m_len += 4;
v = UA_GET_NE32(ip + m_len) ^ UA_GET_NE32(m_pos + m_len);
if (v != 0)
break;
m_len += 4;
v = UA_GET_NE32(ip + m_len) ^ UA_GET_NE32(m_pos + m_len);
if __lzo_unlikely(ip + m_len >= ip_end)
goto m_len_done;
} while (v == 0);
}
#if (LZO_ABI_BIG_ENDIAN) && defined(lzo_bitops_ctlz32)
m_len += lzo_bitops_ctlz32(v) / CHAR_BIT;
#elif (LZO_ABI_BIG_ENDIAN)
if ((v >> (32 - CHAR_BIT)) == 0) do {
v <<= CHAR_BIT;
m_len += 1;
} while ((v >> (32 - CHAR_BIT)) == 0);
#elif (LZO_ABI_LITTLE_ENDIAN) && defined(lzo_bitops_cttz32)
m_len += lzo_bitops_cttz32(v) / CHAR_BIT;
#elif (LZO_ABI_LITTLE_ENDIAN)
if ((v & UCHAR_MAX) == 0) do {
v >>= CHAR_BIT;
m_len += 1;
} while ((v & UCHAR_MAX) == 0);
#else
if (ip[m_len] == m_pos[m_len]) do {
m_len += 1;
} while (ip[m_len] == m_pos[m_len]);
#endif
#else
if __lzo_unlikely(ip[m_len] == m_pos[m_len]) {
do {
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if (ip[m_len] != m_pos[m_len])
break;
m_len += 1;
if __lzo_unlikely(ip + m_len >= ip_end)
goto m_len_done;
} while (ip[m_len] == m_pos[m_len]);
}
#endif
}
m_len_done:
m_off = pd(ip,m_pos);
ip += m_len;
ii = ip;
if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
{
m_off -= 1;
#if defined(LZO1X)
*op++ = LZO_BYTE(((m_len - 1) << 5) | ((m_off & 7) << 2));
*op++ = LZO_BYTE(m_off >> 3);
#elif defined(LZO1Y)
*op++ = LZO_BYTE(((m_len + 1) << 4) | ((m_off & 3) << 2));
*op++ = LZO_BYTE(m_off >> 2);
#endif
}
else if (m_off <= M3_MAX_OFFSET)
{
m_off -= 1;
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 __lzo_unlikely(m_len > 255)
{
m_len -= 255;
UA_SET1(op, 0);
op++;
}
*op++ = LZO_BYTE(m_len);
}
*op++ = LZO_BYTE(m_off << 2);
*op++ = LZO_BYTE(m_off >> 6);
}
else
{
m_off -= 0x4000;
if (m_len <= M4_MAX_LEN)
*op++ = LZO_BYTE(M4_MARKER | ((m_off >> 11) & 8) | (m_len - 2));
else
{
m_len -= M4_MAX_LEN;
*op++ = LZO_BYTE(M4_MARKER | ((m_off >> 11) & 8));
while __lzo_unlikely(m_len > 255)
{
m_len -= 255;
UA_SET1(op, 0);
op++;
}
*op++ = LZO_BYTE(m_len);
}
*op++ = LZO_BYTE(m_off << 2);
*op++ = LZO_BYTE(m_off >> 6);
}
goto next;
}
*out_len = pd(op, out);
return pd(in_end,ii-ti);
}
/***********************************************************************
// public entry point
************************************************************************/
LZO_PUBLIC(int)
DO_COMPRESS ( const lzo_bytep in , lzo_uint in_len,
lzo_bytep out, lzo_uintp out_len,
lzo_voidp wrkmem )
{
const lzo_bytep ip = in;
lzo_bytep op = out;
lzo_uint l = in_len;
lzo_uint t = 0;
while (l > 20)
{
lzo_uint ll = l;
lzo_uintptr_t ll_end;
#if 0 || (LZO_DETERMINISTIC)
ll = LZO_MIN(ll, 49152);
#endif
ll_end = (lzo_uintptr_t)ip + ll;
if ((ll_end + ((t + ll) >> 5)) <= ll_end || (const lzo_bytep)(ll_end + ((t + ll) >> 5)) <= ip + ll)
break;
#if (LZO_DETERMINISTIC)
lzo_memset(wrkmem, 0, ((lzo_uint)1 << D_BITS) * sizeof(lzo_dict_t));
#endif
t = do_compress(ip,ll,op,out_len,t,wrkmem);
ip += ll;
op += *out_len;
l -= ll;
}
t += l;
if (t > 0)
{
const lzo_bytep ii = in + in_len - t;
if (op == out && t <= 238)
*op++ = LZO_BYTE(17 + t);
else if (t <= 3)
op[-2] = LZO_BYTE(op[-2] | t);
else if (t <= 18)
*op++ = LZO_BYTE(t - 3);
else
{
lzo_uint tt = t - 18;
*op++ = 0;
while (tt > 255)
{
tt -= 255;
UA_SET1(op, 0);
op++;
}
assert(tt > 0);
*op++ = LZO_BYTE(tt);
}
UA_COPYN(op, ii, t);
op += t;
}
*op++ = M4_MARKER | 1;
*op++ = 0;
*op++ = 0;
*out_len = pd(op, out);
return LZO_E_OK;
}
/* vim:set ts=4 sw=4 et: */
|
