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-rw-r--r--encoder_base.h121
1 files changed, 58 insertions, 63 deletions
diff --git a/encoder_base.h b/encoder_base.h
index 9ce622c..e186c2d 100644
--- a/encoder_base.h
+++ b/encoder_base.h
@@ -1,5 +1,5 @@
/* Lzip - LZMA lossless data compressor
- Copyright (C) 2008-2016 Antonio Diaz Diaz.
+ Copyright (C) 2008-2017 Antonio Diaz Diaz.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -85,13 +85,13 @@ inline int price0( const Bit_model bm )
inline int price1( const Bit_model bm )
{ return prob_prices[bit_model_total - bm.probability]; }
-inline int price_bit( const Bit_model bm, const int bit )
- { if( bit ) return price1( bm ); else return price0( bm ); }
+inline int price_bit( const Bit_model bm, const bool bit )
+ { return ( bit ? price1( bm ) : price0( bm ) ); }
inline int price_symbol3( const Bit_model bm[], int symbol )
{
- int bit = symbol & 1;
+ bool bit = symbol & 1;
symbol |= 8; symbol >>= 1;
int price = price_bit( bm[symbol], bit );
bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
@@ -99,9 +99,9 @@ inline int price_symbol3( const Bit_model bm[], int symbol )
}
-inline int price_symbol6( const Bit_model bm[], int symbol )
+inline int price_symbol6( const Bit_model bm[], unsigned symbol )
{
- int bit = symbol & 1;
+ bool bit = symbol & 1;
symbol |= 64; symbol >>= 1;
int price = price_bit( bm[symbol], bit );
bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
@@ -114,7 +114,7 @@ inline int price_symbol6( const Bit_model bm[], int symbol )
inline int price_symbol8( const Bit_model bm[], int symbol )
{
- int bit = symbol & 1;
+ bool bit = symbol & 1;
symbol |= 0x100; symbol >>= 1;
int price = price_bit( bm[symbol], bit );
bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
@@ -134,31 +134,29 @@ inline int price_symbol_reversed( const Bit_model bm[], int symbol,
int model = 1;
for( int 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;
}
-inline int price_matched( const Bit_model bm[], int symbol, int match_byte )
+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 {
- match_byte <<= 1;
- const int match_bit = match_byte & mask;
- symbol <<= 1;
- const int 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;
}
@@ -203,12 +201,11 @@ public:
bool data_finished() const { return at_stream_end && pos >= stream_pos; }
const uint8_t * ptr_to_current_pos() const { return buffer + pos; }
- int true_match_len( const int index, const int distance, int len_limit ) const
+ int true_match_len( const int index, const int distance ) const
{
- const uint8_t * const data = buffer + pos + index;
- int i = 0;
- if( index + len_limit > available_bytes() )
- len_limit = available_bytes() - index;
+ const uint8_t * const data = buffer + pos;
+ int i = index;
+ const int len_limit = std::min( available_bytes(), (int)max_match_len );
while( i < len_limit && data[i-distance] == data[i] ) ++i;
return i;
}
@@ -238,9 +235,9 @@ class Range_encoder
void shift_low()
{
- const bool carry = ( low > 0xFFFFFFFFU );
- if( carry || low < 0xFF000000U )
+ if( low >> 24 != 0xFF )
{
+ const bool carry = ( low > 0xFFFFFFFFU );
put_byte( cache + carry );
for( ; ff_count > 0; --ff_count ) put_byte( 0xFF + carry );
cache = low >> 24;
@@ -291,15 +288,15 @@ public:
void encode( const int symbol, const int num_bits )
{
- for( int i = num_bits - 1; i >= 0; --i )
+ for( unsigned mask = 1 << ( num_bits - 1 ); mask > 0; mask >>= 1 )
{
range >>= 1;
- if( (symbol >> i) & 1 ) low += range;
+ if( symbol & mask ) low += range;
if( range <= 0x00FFFFFFU ) { range <<= 8; shift_low(); }
}
}
- void encode_bit( Bit_model & bm, const int bit )
+ void encode_bit( Bit_model & bm, const bool bit )
{
const uint32_t bound = ( range >> bit_model_total_bits ) * bm.probability;
if( !bit )
@@ -319,17 +316,17 @@ public:
void encode_tree3( Bit_model bm[], const int symbol )
{
int model = 1;
- int bit = ( symbol >> 2 ) & 1;
+ bool bit = ( symbol >> 2 ) & 1;
encode_bit( bm[model], bit ); model = ( model << 1 ) | bit;
bit = ( symbol >> 1 ) & 1;
encode_bit( bm[model], bit ); model = ( model << 1 ) | bit;
encode_bit( bm[model], symbol & 1 );
}
- void encode_tree6( Bit_model bm[], const int symbol )
+ void encode_tree6( Bit_model bm[], const unsigned symbol )
{
int model = 1;
- int bit = ( symbol >> 5 ) & 1;
+ bool bit = ( symbol >> 5 ) & 1;
encode_bit( bm[model], bit ); model = ( model << 1 ) | bit;
bit = ( symbol >> 4 ) & 1;
encode_bit( bm[model], bit ); model = ( model << 1 ) | bit;
@@ -345,13 +342,12 @@ public:
void encode_tree8( Bit_model bm[], const int symbol )
{
int model = 1;
- int mask = ( 1 << 7 );
- do {
- const int bit = ( symbol & mask );
+ for( int i = 7; i >= 0; --i )
+ {
+ const bool bit = ( symbol >> i ) & 1;
encode_bit( bm[model], bit );
- model <<= 1; if( bit ) ++model;
+ model = ( model << 1 ) | bit;
}
- while( mask >>= 1 );
}
void encode_tree_reversed( Bit_model bm[], int symbol, const int num_bits )
@@ -359,44 +355,41 @@ public:
int model = 1;
for( int i = num_bits; i > 0; --i )
{
- const int bit = symbol & 1;
+ const bool bit = symbol & 1;
+ symbol >>= 1;
encode_bit( bm[model], bit );
model = ( model << 1 ) | bit;
- symbol >>= 1;
}
}
- void encode_matched( Bit_model bm[], int symbol, int match_byte )
+ void encode_matched( Bit_model bm[], unsigned symbol, unsigned match_byte )
{
- int mask = 0x100;
+ unsigned mask = 0x100;
symbol |= mask;
-
- do {
- match_byte <<= 1;
- const int match_bit = match_byte & mask;
- symbol <<= 1;
- const int bit = symbol & 0x100;
- encode_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;
+ encode_bit( bm[(symbol>>9)+match_bit+mask], bit );
+ if( symbol >= 0x10000 ) break;
+ mask &= ~(match_bit ^ symbol); // if( match_bit != bit ) mask = 0;
}
- while( symbol < 0x10000 );
}
void encode_len( Len_model & lm, int symbol, const int pos_state )
{
- symbol -= min_match_len;
- bool bit = ( symbol >= len_low_symbols );
+ bool bit = ( ( symbol -= min_match_len ) >= len_low_symbols );
encode_bit( lm.choice1, bit );
if( !bit )
encode_tree3( lm.bm_low[pos_state], symbol );
else
{
- bit = ( symbol >= len_low_symbols + len_mid_symbols );
+ bit = ( ( symbol -= len_low_symbols ) >= len_mid_symbols );
encode_bit( lm.choice2, bit );
if( !bit )
- encode_tree3( lm.bm_mid[pos_state], symbol - len_low_symbols );
+ encode_tree3( lm.bm_mid[pos_state], symbol );
else
- encode_tree8( lm.bm_high, symbol - len_low_symbols - len_mid_symbols );
+ encode_tree8( lm.bm_high, symbol - len_mid_symbols );
}
}
};
@@ -418,15 +411,17 @@ protected:
Bit_model bm_rep2[State::states];
Bit_model bm_len[State::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];
Len_model match_len_model;
Len_model rep_len_model;
Range_encoder renc;
- LZ_encoder_base( const int before, const int dict_size, const int after_size,
- const int dict_factor, const int num_prev_positions23,
- const int pos_array_factor, const int ifd, const int outfd )
+ LZ_encoder_base( const int before, const int dict_size,
+ const int after_size, const int dict_factor,
+ const int num_prev_positions23,
+ const int pos_array_factor,
+ const int ifd, const int outfd )
:
Matchfinder_base( before, dict_size, after_size, dict_factor,
num_prev_positions23, pos_array_factor, ifd ),
@@ -455,7 +450,7 @@ protected:
void encode_pair( const unsigned dis, const int len, const int pos_state )
{
renc.encode_len( match_len_model, len, pos_state );
- const int dis_slot = get_slot( dis );
+ const unsigned dis_slot = get_slot( dis );
renc.encode_tree6( bm_dis_slot[get_len_state(len)], dis_slot );
if( dis_slot >= start_dis_model )
@@ -465,7 +460,7 @@ protected:
const unsigned direct_dis = dis - base;
if( dis_slot < end_dis_model )
- renc.encode_tree_reversed( bm_dis + base - dis_slot - 1, direct_dis,
+ renc.encode_tree_reversed( bm_dis + ( base - dis_slot ), direct_dis,
direct_bits );
else
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-02 01:39:39 +0000