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-rw-r--r--encoder_base.h247
1 files changed, 137 insertions, 110 deletions
diff --git a/encoder_base.h b/encoder_base.h
index 3209922..c4cfcca 100644
--- a/encoder_base.h
+++ b/encoder_base.h
@@ -1,28 +1,20 @@
/* Lzlib - Compression library for the lzip format
- Copyright (C) 2009-2016 Antonio Diaz Diaz.
+ Copyright (C) 2009-2017 Antonio Diaz Diaz.
- This 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.
+ This library is free software. Redistribution and use in source and
+ binary forms, with or without modification, are permitted provided
+ that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
This 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 this library. If not, see <http://www.gnu.org/licenses/>.
-
- As a special exception, you may use this file as part of a free
- software library without restriction. Specifically, if other files
- instantiate templates or use macros or inline functions from this
- file, or you compile this file and link it with other files to
- produce an executable, this file does not by itself cause the
- resulting executable to be covered by the GNU General Public
- License. This exception does not however invalidate any other
- reasons why the executable file might be covered by the GNU General
- Public License.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
enum { price_shift_bits = 6,
@@ -149,22 +141,48 @@ static inline int price0( const Bit_model probability )
static inline int price1( const Bit_model probability )
{ return get_price( bit_model_total - probability ); }
-static inline int price_bit( const Bit_model bm, const int bit )
- { if( bit ) return price1( bm ); else return price0( bm ); }
+static inline int price_bit( const Bit_model bm, const bool bit )
+ { return ( bit ? price1( bm ) : price0( bm ) ); }
-static inline int price_symbol( const Bit_model bm[], int symbol,
- const int num_bits )
+static inline int price_symbol3( const Bit_model bm[], int symbol )
{
- int price = 0;
- symbol |= ( 1 << num_bits );
- while( symbol > 1 )
- {
- const int bit = symbol & 1;
- symbol >>= 1;
- price += price_bit( bm[symbol], bit );
- }
- return price;
+ int price;
+ bool bit = symbol & 1;
+ symbol |= 8; symbol >>= 1;
+ price = price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ return price + price_bit( bm[1], symbol & 1 );
+ }
+
+
+static inline int price_symbol6( const Bit_model bm[], unsigned symbol )
+ {
+ int price;
+ bool bit = symbol & 1;
+ symbol |= 64; symbol >>= 1;
+ price = price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ return price + price_bit( bm[1], symbol & 1 );
+ }
+
+
+static inline int price_symbol8( const Bit_model bm[], int symbol )
+ {
+ int price;
+ bool bit = symbol & 1;
+ symbol |= 0x100; symbol >>= 1;
+ price = price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+ return price + price_bit( bm[1], symbol & 1 );
}
@@ -176,33 +194,29 @@ static inline int price_symbol_reversed( const Bit_model bm[], int symbol,
int i;
for( i = num_bits; i > 0; --i )
{
- const int bit = symbol & 1;
+ const bool bit = symbol & 1;
+ symbol >>= 1;
price += price_bit( bm[model], bit );
model = ( model << 1 ) | bit;
- symbol >>= 1;
}
return price;
}
-static inline int price_matched( const Bit_model bm[], int symbol,
- int match_byte )
+static inline int price_matched( const Bit_model bm[], unsigned symbol,
+ unsigned match_byte )
{
int price = 0;
- int mask = 0x100;
+ unsigned mask = 0x100;
symbol |= mask;
-
- do {
- int match_bit, bit;
- match_byte <<= 1;
- match_bit = match_byte & mask;
- symbol <<= 1;
- bit = symbol & 0x100;
- price += price_bit( bm[match_bit+(symbol>>9)+mask], bit );
- mask &= ~(match_byte ^ symbol); /* if( match_bit != bit ) mask = 0; */
+ while( true )
+ {
+ const unsigned match_bit = ( match_byte <<= 1 ) & mask;
+ const bool bit = ( symbol <<= 1 ) & 0x100;
+ price += price_bit( bm[(symbol>>9)+match_bit+mask], bit );
+ if( symbol >= 0x10000 ) return price;
+ mask &= ~(match_bit ^ symbol); /* if( match_bit != bit ) mask = 0; */
}
- while( symbol < 0x10000 );
- return price;
}
@@ -264,10 +278,8 @@ static inline int Mb_free_bytes( const struct Matchfinder_base * const mb )
return mb->buffer_size - mb->stream_pos; }
static inline bool Mb_enough_available_bytes( const struct Matchfinder_base * const mb )
- {
- return ( mb->pos + mb->after_size <= mb->stream_pos ||
- ( Mb_flushing_or_end( mb ) && mb->pos < mb->stream_pos ) );
- }
+ { return ( mb->pos + mb->after_size <= mb->stream_pos ||
+ ( Mb_flushing_or_end( mb ) && mb->pos < mb->stream_pos ) ); }
static inline const uint8_t *
Mb_ptr_to_current_pos( const struct Matchfinder_base * const mb )
@@ -284,13 +296,11 @@ static int Mb_write_data( struct Matchfinder_base * const mb,
}
static inline int Mb_true_match_len( const struct Matchfinder_base * const mb,
- const int index, const int distance,
- int len_limit )
+ const int index, const int distance )
{
- const uint8_t * const data = mb->buffer + mb->pos + index;
- int i = 0;
- if( index + len_limit > Mb_available_bytes( mb ) )
- len_limit = Mb_available_bytes( mb ) - index;
+ const uint8_t * const data = mb->buffer + mb->pos;
+ int i = index;
+ const int len_limit = min( Mb_available_bytes( mb ), max_match_len );
while( i < len_limit && data[i-distance] == data[i] ) ++i;
return i;
}
@@ -317,9 +327,9 @@ struct Range_encoder
static inline void Re_shift_low( struct Range_encoder * const renc )
{
- const bool carry = ( renc->low > 0xFFFFFFFFU );
- if( carry || renc->low < 0xFF000000U )
+ if( renc->low >> 24 != 0xFF )
{
+ const bool carry = ( renc->low > 0xFFFFFFFFU );
Cb_put_byte( &renc->cb, renc->cache + carry );
for( ; renc->ff_count > 0; --renc->ff_count )
Cb_put_byte( &renc->cb, 0xFF + carry );
@@ -384,18 +394,18 @@ static inline void Re_flush( struct Range_encoder * const renc )
static inline void Re_encode( struct Range_encoder * const renc,
const int symbol, const int num_bits )
{
- int i;
- for( i = num_bits - 1; i >= 0; --i )
+ unsigned mask;
+ for( mask = 1 << ( num_bits - 1 ); mask > 0; mask >>= 1 )
{
renc->range >>= 1;
- if( (symbol >> i) & 1 ) renc->low += renc->range;
+ if( symbol & mask ) renc->low += renc->range;
if( renc->range <= 0x00FFFFFFU )
{ renc->range <<= 8; Re_shift_low( renc ); }
}
}
static inline void Re_encode_bit( struct Range_encoder * const renc,
- Bit_model * const probability, const int bit )
+ Bit_model * const probability, const bool bit )
{
const uint32_t bound = ( renc->range >> bit_model_total_bits ) * *probability;
if( !bit )
@@ -409,56 +419,78 @@ static inline void Re_encode_bit( struct Range_encoder * const renc,
renc->range -= bound;
*probability -= *probability >> bit_model_move_bits;
}
- if( renc->range <= 0x00FFFFFFU )
- { renc->range <<= 8; Re_shift_low( renc ); }
+ if( renc->range <= 0x00FFFFFFU ) { renc->range <<= 8; Re_shift_low( renc ); }
+ }
+
+static inline void Re_encode_tree3( struct Range_encoder * const renc,
+ Bit_model bm[], const int symbol )
+ {
+ int model = 1;
+ bool bit = ( symbol >> 2 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ bit = ( symbol >> 1 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ Re_encode_bit( renc, &bm[model], symbol & 1 );
}
-static inline void Re_encode_tree( struct Range_encoder * const renc,
- Bit_model bm[], const int symbol, const int num_bits )
+static inline void Re_encode_tree6( struct Range_encoder * const renc,
+ Bit_model bm[], const unsigned symbol )
+ {
+ int model = 1;
+ bool bit = ( symbol >> 5 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ bit = ( symbol >> 4 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ bit = ( symbol >> 3 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ bit = ( symbol >> 2 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ bit = ( symbol >> 1 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model = ( model << 1 ) | bit;
+ Re_encode_bit( renc, &bm[model], symbol & 1 );
+ }
+
+static inline void Re_encode_tree8( struct Range_encoder * const renc,
+ Bit_model bm[], const int symbol )
{
- int mask = ( 1 << ( num_bits - 1 ) );
int model = 1;
int i;
- for( i = num_bits; i > 0; --i, mask >>= 1 )
+ for( i = 7; i >= 0; --i )
{
- const int bit = ( symbol & mask );
+ const bool bit = ( symbol >> i ) & 1;
Re_encode_bit( renc, &bm[model], bit );
- model <<= 1;
- if( bit ) model |= 1;
+ model = ( model << 1 ) | bit;
}
}
static inline void Re_encode_tree_reversed( struct Range_encoder * const renc,
- Bit_model bm[], int symbol, const int num_bits )
+ Bit_model bm[], int symbol, const int num_bits )
{
int model = 1;
int i;
for( i = num_bits; i > 0; --i )
{
- const int bit = symbol & 1;
+ const bool bit = symbol & 1;
+ symbol >>= 1;
Re_encode_bit( renc, &bm[model], bit );
model = ( model << 1 ) | bit;
- symbol >>= 1;
}
}
static inline void Re_encode_matched( struct Range_encoder * const renc,
- Bit_model bm[], int symbol,
- int match_byte )
+ Bit_model bm[], unsigned symbol,
+ unsigned match_byte )
{
- int mask = 0x100;
+ unsigned mask = 0x100;
symbol |= mask;
-
- do {
- int match_bit, bit;
- match_byte <<= 1;
- match_bit = match_byte & mask;
- symbol <<= 1;
- bit = symbol & 0x100;
- Re_encode_bit( renc, &bm[match_bit+(symbol>>9)+mask], bit );
- mask &= ~(match_byte ^ symbol); /* if( match_bit != bit ) mask = 0; */
+ while( true )
+ {
+ const unsigned match_bit = ( match_byte <<= 1 ) & mask;
+ const bool bit = ( symbol <<= 1 ) & 0x100;
+ Re_encode_bit( renc, &bm[(symbol>>9)+match_bit+mask], bit );
+ if( symbol >= 0x10000 ) break;
+ mask &= ~(match_bit ^ symbol); /* if( match_bit != bit ) mask = 0; */
}
- while( symbol < 0x10000 );
}
static inline void Re_encode_len( struct Range_encoder * const renc,
@@ -468,17 +500,15 @@ static inline void Re_encode_len( struct Range_encoder * const renc,
bool bit = ( ( symbol -= min_match_len ) >= len_low_symbols );
Re_encode_bit( renc, &lm->choice1, bit );
if( !bit )
- Re_encode_tree( renc, lm->bm_low[pos_state], symbol, len_low_bits );
+ Re_encode_tree3( renc, lm->bm_low[pos_state], symbol );
else
{
- bit = ( symbol >= len_low_symbols + len_mid_symbols );
+ bit = ( ( symbol -= len_low_symbols ) >= len_mid_symbols );
Re_encode_bit( renc, &lm->choice2, bit );
if( !bit )
- Re_encode_tree( renc, lm->bm_mid[pos_state],
- symbol - len_low_symbols, len_mid_bits );
+ Re_encode_tree3( renc, lm->bm_mid[pos_state], symbol );
else
- Re_encode_tree( renc, lm->bm_high,
- symbol - len_low_symbols - len_mid_symbols, len_high_bits );
+ Re_encode_tree8( renc, lm->bm_high, symbol - len_mid_symbols );
}
}
@@ -500,7 +530,7 @@ struct LZ_encoder_base
Bit_model bm_rep2[states];
Bit_model bm_len[states][pos_states];
Bit_model bm_dis_slot[len_states][1<<dis_slot_bits];
- Bit_model bm_dis[modeled_distances-end_dis_model];
+ Bit_model bm_dis[modeled_distances-end_dis_model+1];
Bit_model bm_align[dis_align_size];
struct Len_model match_len_model;
struct Len_model rep_len_model;
@@ -539,23 +569,21 @@ static inline unsigned LZeb_crc( const struct LZ_encoder_base * const eb )
{ return eb->crc ^ 0xFFFFFFFFU; }
static inline int LZeb_price_literal( const struct LZ_encoder_base * const eb,
- uint8_t prev_byte, uint8_t symbol )
- { return price_symbol( eb->bm_literal[get_lit_state(prev_byte)], symbol, 8 ); }
+ const uint8_t prev_byte, const uint8_t symbol )
+ { return price_symbol8( eb->bm_literal[get_lit_state(prev_byte)], symbol ); }
static inline int LZeb_price_matched( const struct LZ_encoder_base * const eb,
- uint8_t prev_byte, uint8_t symbol,
- uint8_t match_byte )
+ const uint8_t prev_byte, const uint8_t symbol, const uint8_t match_byte )
{ return price_matched( eb->bm_literal[get_lit_state(prev_byte)], symbol,
match_byte ); }
static inline void LZeb_encode_literal( struct LZ_encoder_base * const eb,
- uint8_t prev_byte, uint8_t symbol )
- { Re_encode_tree( &eb->renc,
- eb->bm_literal[get_lit_state(prev_byte)], symbol, 8 ); }
+ const uint8_t prev_byte, const uint8_t symbol )
+ { Re_encode_tree8( &eb->renc, eb->bm_literal[get_lit_state(prev_byte)],
+ symbol ); }
static inline void LZeb_encode_matched( struct LZ_encoder_base * const eb,
- uint8_t prev_byte, uint8_t symbol,
- uint8_t match_byte )
+ const uint8_t prev_byte, const uint8_t symbol, const uint8_t match_byte )
{ Re_encode_matched( &eb->renc, eb->bm_literal[get_lit_state(prev_byte)],
symbol, match_byte ); }
@@ -563,10 +591,9 @@ static inline void LZeb_encode_pair( struct LZ_encoder_base * const eb,
const unsigned dis, const int len,
const int pos_state )
{
- const int dis_slot = get_slot( dis );
+ const unsigned dis_slot = get_slot( dis );
Re_encode_len( &eb->renc, &eb->match_len_model, len, pos_state );
- Re_encode_tree( &eb->renc, eb->bm_dis_slot[get_len_state(len)], dis_slot,
- dis_slot_bits );
+ Re_encode_tree6( &eb->renc, eb->bm_dis_slot[get_len_state(len)], dis_slot );
if( dis_slot >= start_dis_model )
{
@@ -575,7 +602,7 @@ static inline void LZeb_encode_pair( struct LZ_encoder_base * const eb,
const unsigned direct_dis = dis - base;
if( dis_slot < end_dis_model )
- Re_encode_tree_reversed( &eb->renc, eb->bm_dis + base - dis_slot - 1,
+ Re_encode_tree_reversed( &eb->renc, eb->bm_dis + ( base - dis_slot ),
direct_dis, direct_bits );
else
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 16:14:45 +0000