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-rw-r--r--encoder_base.h612
1 files changed, 612 insertions, 0 deletions
diff --git a/encoder_base.h b/encoder_base.h
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+/* Lzlib - Compression library for the lzip format
+ Copyright (C) 2009-2022 Antonio Diaz Diaz.
+
+ 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.
+*/
+
+enum { price_shift_bits = 6,
+ price_step_bits = 2 };
+
+static const uint8_t dis_slots[1<<10] =
+ {
+ 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,
+ 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19 };
+
+static inline uint8_t get_slot( const unsigned dis )
+ {
+ if( dis < (1 << 10) ) return dis_slots[dis];
+ if( dis < (1 << 19) ) return dis_slots[dis>> 9] + 18;
+ if( dis < (1 << 28) ) return dis_slots[dis>>18] + 36;
+ return dis_slots[dis>>27] + 54;
+ }
+
+
+static const short prob_prices[bit_model_total >> price_step_bits] =
+{
+640, 539, 492, 461, 438, 419, 404, 390, 379, 369, 359, 351, 343, 336, 330, 323,
+318, 312, 307, 302, 298, 293, 289, 285, 281, 277, 274, 270, 267, 264, 261, 258,
+255, 252, 250, 247, 244, 242, 239, 237, 235, 232, 230, 228, 226, 224, 222, 220,
+218, 216, 214, 213, 211, 209, 207, 206, 204, 202, 201, 199, 198, 196, 195, 193,
+192, 190, 189, 188, 186, 185, 184, 182, 181, 180, 178, 177, 176, 175, 174, 172,
+171, 170, 169, 168, 167, 166, 165, 164, 163, 162, 161, 159, 158, 157, 157, 156,
+155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 145, 144, 143, 142, 141,
+140, 140, 139, 138, 137, 136, 136, 135, 134, 133, 133, 132, 131, 130, 130, 129,
+128, 127, 127, 126, 125, 125, 124, 123, 123, 122, 121, 121, 120, 119, 119, 118,
+117, 117, 116, 115, 115, 114, 114, 113, 112, 112, 111, 111, 110, 109, 109, 108,
+108, 107, 106, 106, 105, 105, 104, 104, 103, 103, 102, 101, 101, 100, 100, 99,
+ 99, 98, 98, 97, 97, 96, 96, 95, 95, 94, 94, 93, 93, 92, 92, 91,
+ 91, 90, 90, 89, 89, 88, 88, 88, 87, 87, 86, 86, 85, 85, 84, 84,
+ 83, 83, 83, 82, 82, 81, 81, 80, 80, 80, 79, 79, 78, 78, 77, 77,
+ 77, 76, 76, 75, 75, 75, 74, 74, 73, 73, 73, 72, 72, 71, 71, 71,
+ 70, 70, 70, 69, 69, 68, 68, 68, 67, 67, 67, 66, 66, 65, 65, 65,
+ 64, 64, 64, 63, 63, 63, 62, 62, 61, 61, 61, 60, 60, 60, 59, 59,
+ 59, 58, 58, 58, 57, 57, 57, 56, 56, 56, 55, 55, 55, 54, 54, 54,
+ 53, 53, 53, 53, 52, 52, 52, 51, 51, 51, 50, 50, 50, 49, 49, 49,
+ 48, 48, 48, 48, 47, 47, 47, 46, 46, 46, 45, 45, 45, 45, 44, 44,
+ 44, 43, 43, 43, 43, 42, 42, 42, 41, 41, 41, 41, 40, 40, 40, 40,
+ 39, 39, 39, 38, 38, 38, 38, 37, 37, 37, 37, 36, 36, 36, 35, 35,
+ 35, 35, 34, 34, 34, 34, 33, 33, 33, 33, 32, 32, 32, 32, 31, 31,
+ 31, 31, 30, 30, 30, 30, 29, 29, 29, 29, 28, 28, 28, 28, 27, 27,
+ 27, 27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 24, 24, 24, 24, 23,
+ 23, 23, 23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 20, 20, 20, 20,
+ 20, 19, 19, 19, 19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 16,
+ 16, 16, 16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 13, 13, 13,
+ 13, 13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 10,
+ 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7,
+ 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4,
+ 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1 };
+
+static inline int get_price( const int probability )
+ { return prob_prices[probability >> price_step_bits]; }
+
+
+static inline int price0( const Bit_model probability )
+ { return get_price( 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 bool bit )
+ { return ( bit ? price1( bm ) : price0( bm ) ); }
+
+
+static inline int price_symbol3( const Bit_model bm[], int symbol )
+ {
+ 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 );
+ return price + price_bit( bm[1], symbol & 1 );
+ }
+
+
+static inline int price_symbol6( const Bit_model bm[], unsigned symbol )
+ {
+ 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 );
+ 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 )
+ {
+ 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 );
+ 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 );
+ }
+
+
+static inline int price_symbol_reversed( const Bit_model bm[], int symbol,
+ const int num_bits )
+ {
+ int price = 0;
+ int model = 1;
+ int i;
+ for( i = num_bits; i > 0; --i )
+ {
+ const bool bit = symbol & 1;
+ symbol >>= 1;
+ price += price_bit( bm[model], bit );
+ model <<= 1; model |= bit;
+ }
+ return price;
+ }
+
+
+static inline int price_matched( const Bit_model bm[], unsigned symbol,
+ unsigned match_byte )
+ {
+ int price = 0;
+ unsigned mask = 0x100;
+ symbol |= mask;
+ 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; */
+ }
+ }
+
+
+struct Matchfinder_base
+ {
+ unsigned long long partial_data_pos;
+ uint8_t * buffer; /* input buffer */
+ int32_t * prev_positions; /* 1 + last seen position of key. else 0 */
+ int32_t * pos_array; /* may be tree or chain */
+ int before_size; /* bytes to keep in buffer before dictionary */
+ int after_size; /* bytes to keep in buffer after pos */
+ int buffer_size;
+ int dictionary_size; /* bytes to keep in buffer before pos */
+ int pos; /* current pos in buffer */
+ int cyclic_pos; /* cycles through [0, dictionary_size] */
+ int stream_pos; /* first byte not yet read from file */
+ int pos_limit; /* when reached, a new block must be read */
+ int key4_mask;
+ int num_prev_positions23;
+ int num_prev_positions; /* size of prev_positions */
+ int pos_array_size;
+ int saved_dictionary_size; /* dictionary_size restored by Mb_reset */
+ bool at_stream_end; /* stream_pos shows real end of file */
+ bool sync_flush_pending;
+ };
+
+static bool Mb_normalize_pos( struct Matchfinder_base * const mb );
+
+static bool Mb_init( struct Matchfinder_base * const mb, const int before_size,
+ const int dict_size, const int after_size,
+ const int dict_factor, const int num_prev_positions23,
+ const int pos_array_factor );
+
+static inline void Mb_free( struct Matchfinder_base * const mb )
+ { free( mb->prev_positions ); free( mb->buffer ); }
+
+static inline uint8_t Mb_peek( const struct Matchfinder_base * const mb,
+ const int distance )
+ { return mb->buffer[mb->pos-distance]; }
+
+static inline int Mb_available_bytes( const struct Matchfinder_base * const mb )
+ { return mb->stream_pos - mb->pos; }
+
+static inline unsigned long long
+Mb_data_position( const struct Matchfinder_base * const mb )
+ { return mb->partial_data_pos + mb->pos; }
+
+static inline void Mb_finish( struct Matchfinder_base * const mb )
+ { mb->at_stream_end = true; mb->sync_flush_pending = false; }
+
+static inline bool Mb_data_finished( const struct Matchfinder_base * const mb )
+ { return mb->at_stream_end && mb->pos >= mb->stream_pos; }
+
+static inline bool Mb_flushing_or_end( const struct Matchfinder_base * const mb )
+ { return mb->at_stream_end || mb->sync_flush_pending; }
+
+static inline int Mb_free_bytes( const struct Matchfinder_base * const mb )
+ { if( Mb_flushing_or_end( mb ) ) return 0;
+ 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 ) ); }
+
+static inline const uint8_t *
+Mb_ptr_to_current_pos( const struct Matchfinder_base * const mb )
+ { return mb->buffer + mb->pos; }
+
+static int Mb_write_data( struct Matchfinder_base * const mb,
+ const uint8_t * const inbuf, const int size )
+ {
+ const int sz = min( mb->buffer_size - mb->stream_pos, size );
+ if( Mb_flushing_or_end( mb ) || sz <= 0 ) return 0;
+ memcpy( mb->buffer + mb->stream_pos, inbuf, sz );
+ mb->stream_pos += sz;
+ return sz;
+ }
+
+static inline int Mb_true_match_len( const struct Matchfinder_base * const mb,
+ const int index, const int distance )
+ {
+ 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;
+ }
+
+static inline bool Mb_move_pos( struct Matchfinder_base * const mb )
+ {
+ if( ++mb->cyclic_pos > mb->dictionary_size ) mb->cyclic_pos = 0;
+ if( ++mb->pos >= mb->pos_limit ) return Mb_normalize_pos( mb );
+ return true;
+ }
+
+
+struct Range_encoder
+ {
+ struct Circular_buffer cb;
+ unsigned min_free_bytes;
+ uint64_t low;
+ unsigned long long partial_member_pos;
+ uint32_t range;
+ unsigned ff_count;
+ uint8_t cache;
+ Lzip_header header;
+ };
+
+static inline void Re_shift_low( struct Range_encoder * const renc )
+ {
+ 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 );
+ renc->cache = renc->low >> 24;
+ }
+ else ++renc->ff_count;
+ renc->low = ( renc->low & 0x00FFFFFFU ) << 8;
+ }
+
+static inline void Re_reset( struct Range_encoder * const renc,
+ const unsigned dictionary_size )
+ {
+ int i;
+ Cb_reset( &renc->cb );
+ renc->low = 0;
+ renc->partial_member_pos = 0;
+ renc->range = 0xFFFFFFFFU;
+ renc->ff_count = 0;
+ renc->cache = 0;
+ Lh_set_dictionary_size( renc->header, dictionary_size );
+ for( i = 0; i < Lh_size; ++i )
+ Cb_put_byte( &renc->cb, renc->header[i] );
+ }
+
+static inline bool Re_init( struct Range_encoder * const renc,
+ const unsigned dictionary_size,
+ const unsigned min_free_bytes )
+ {
+ if( !Cb_init( &renc->cb, 65536 + min_free_bytes ) ) return false;
+ renc->min_free_bytes = min_free_bytes;
+ Lh_set_magic( renc->header );
+ Re_reset( renc, dictionary_size );
+ return true;
+ }
+
+static inline void Re_free( struct Range_encoder * const renc )
+ { Cb_free( &renc->cb ); }
+
+static inline unsigned long long
+Re_member_position( const struct Range_encoder * const renc )
+ { return renc->partial_member_pos + Cb_used_bytes( &renc->cb ) + renc->ff_count; }
+
+static inline bool Re_enough_free_bytes( const struct Range_encoder * const renc )
+ { return Cb_free_bytes( &renc->cb ) >= renc->min_free_bytes + renc->ff_count; }
+
+static inline int Re_read_data( struct Range_encoder * const renc,
+ uint8_t * const out_buffer, const int out_size )
+ {
+ const int size = Cb_read_data( &renc->cb, out_buffer, out_size );
+ if( size > 0 ) renc->partial_member_pos += size;
+ return size;
+ }
+
+static inline void Re_flush( struct Range_encoder * const renc )
+ {
+ int i; for( i = 0; i < 5; ++i ) Re_shift_low( renc );
+ renc->low = 0;
+ renc->range = 0xFFFFFFFFU;
+ renc->ff_count = 0;
+ renc->cache = 0;
+ }
+
+static inline void Re_encode( struct Range_encoder * const renc,
+ const int symbol, const int num_bits )
+ {
+ unsigned mask;
+ for( mask = 1 << ( num_bits - 1 ); mask > 0; mask >>= 1 )
+ {
+ renc->range >>= 1;
+ 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 bool bit )
+ {
+ const uint32_t bound = ( renc->range >> bit_model_total_bits ) * *probability;
+ if( !bit )
+ {
+ renc->range = bound;
+ *probability += (bit_model_total - *probability) >> bit_model_move_bits;
+ }
+ else
+ {
+ renc->low += bound;
+ renc->range -= bound;
+ *probability -= *probability >> bit_model_move_bits;
+ }
+ 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 )
+ {
+ bool bit = ( symbol >> 2 ) & 1;
+ Re_encode_bit( renc, &bm[1], bit );
+ int model = 2 | bit;
+ bit = ( symbol >> 1 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+ Re_encode_bit( renc, &bm[model], symbol & 1 );
+ }
+
+static inline void Re_encode_tree6( struct Range_encoder * const renc,
+ Bit_model bm[], const unsigned symbol )
+ {
+ bool bit = ( symbol >> 5 ) & 1;
+ Re_encode_bit( renc, &bm[1], bit );
+ int model = 2 | bit;
+ bit = ( symbol >> 4 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+ bit = ( symbol >> 3 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+ bit = ( symbol >> 2 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+ bit = ( symbol >> 1 ) & 1;
+ Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= 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 model = 1;
+ int i;
+ for( i = 7; i >= 0; --i )
+ {
+ const bool bit = ( symbol >> i ) & 1;
+ Re_encode_bit( renc, &bm[model], bit );
+ model <<= 1; model |= bit;
+ }
+ }
+
+static inline void Re_encode_tree_reversed( struct Range_encoder * const renc,
+ Bit_model bm[], int symbol, const int num_bits )
+ {
+ int model = 1;
+ int i;
+ for( i = num_bits; i > 0; --i )
+ {
+ const bool bit = symbol & 1;
+ symbol >>= 1;
+ Re_encode_bit( renc, &bm[model], bit );
+ model <<= 1; model |= bit;
+ }
+ }
+
+static inline void Re_encode_matched( struct Range_encoder * const renc,
+ Bit_model bm[], unsigned symbol,
+ unsigned match_byte )
+ {
+ unsigned mask = 0x100;
+ symbol |= mask;
+ 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; */
+ }
+ }
+
+static inline void Re_encode_len( struct Range_encoder * const renc,
+ struct Len_model * const lm,
+ int symbol, const int pos_state )
+ {
+ bool bit = ( ( symbol -= min_match_len ) >= len_low_symbols );
+ Re_encode_bit( renc, &lm->choice1, bit );
+ if( !bit )
+ Re_encode_tree3( renc, lm->bm_low[pos_state], symbol );
+ else
+ {
+ bit = ( ( symbol -= len_low_symbols ) >= len_mid_symbols );
+ Re_encode_bit( renc, &lm->choice2, bit );
+ if( !bit )
+ Re_encode_tree3( renc, lm->bm_mid[pos_state], symbol );
+ else
+ Re_encode_tree8( renc, lm->bm_high, symbol - len_mid_symbols );
+ }
+ }
+
+
+enum { max_marker_size = 16,
+ num_rep_distances = 4 }; /* must be 4 */
+
+struct LZ_encoder_base
+ {
+ struct Matchfinder_base mb;
+ unsigned long long member_size_limit;
+ uint32_t crc;
+
+ Bit_model bm_literal[1<<literal_context_bits][0x300];
+ Bit_model bm_match[states][pos_states];
+ Bit_model bm_rep[states];
+ Bit_model bm_rep0[states];
+ Bit_model bm_rep1[states];
+ 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+1];
+ Bit_model bm_align[dis_align_size];
+ struct Len_model match_len_model;
+ struct Len_model rep_len_model;
+ struct Range_encoder renc;
+ int reps[num_rep_distances];
+ State state;
+ bool member_finished;
+ };
+
+static void LZeb_reset( struct LZ_encoder_base * const eb,
+ const unsigned long long member_size );
+
+static inline bool LZeb_init( struct LZ_encoder_base * const eb,
+ const int before_size, const int dict_size,
+ const int after_size, const int dict_factor,
+ const int num_prev_positions23,
+ const int pos_array_factor,
+ const unsigned min_free_bytes,
+ const unsigned long long member_size )
+ {
+ if( !Mb_init( &eb->mb, before_size, dict_size, after_size, dict_factor,
+ num_prev_positions23, pos_array_factor ) ) return false;
+ if( !Re_init( &eb->renc, eb->mb.dictionary_size, min_free_bytes ) )
+ return false;
+ LZeb_reset( eb, member_size );
+ return true;
+ }
+
+static inline bool LZeb_member_finished( const struct LZ_encoder_base * const eb )
+ { return ( eb->member_finished && Cb_empty( &eb->renc.cb ) ); }
+
+static inline void LZeb_free( struct LZ_encoder_base * const eb )
+ { Re_free( &eb->renc ); Mb_free( &eb->mb ); }
+
+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,
+ 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,
+ 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,
+ 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,
+ 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 ); }
+
+static inline void LZeb_encode_pair( struct LZ_encoder_base * const eb,
+ const unsigned dis, const int len,
+ const int pos_state )
+ {
+ Re_encode_len( &eb->renc, &eb->match_len_model, len, pos_state );
+ const unsigned dis_slot = get_slot( dis );
+ Re_encode_tree6( &eb->renc, eb->bm_dis_slot[get_len_state(len)], dis_slot );
+
+ if( dis_slot >= start_dis_model )
+ {
+ const int direct_bits = ( dis_slot >> 1 ) - 1;
+ const unsigned base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+ const unsigned direct_dis = dis - base;
+
+ if( dis_slot < end_dis_model )
+ Re_encode_tree_reversed( &eb->renc, eb->bm_dis + ( base - dis_slot ),
+ direct_dis, direct_bits );
+ else
+ {
+ Re_encode( &eb->renc, direct_dis >> dis_align_bits,
+ direct_bits - dis_align_bits );
+ Re_encode_tree_reversed( &eb->renc, eb->bm_align, direct_dis, dis_align_bits );
+ }
+ }
+ }
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-03 02:27:41 +0000