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-rw-r--r--src/liblzma/lzma/lzma_encoder_private.h174
1 files changed, 64 insertions, 110 deletions
diff --git a/src/liblzma/lzma/lzma_encoder_private.h b/src/liblzma/lzma/lzma_encoder_private.h
index a16051f8..7533bc79 100644
--- a/src/liblzma/lzma/lzma_encoder_private.h
+++ b/src/liblzma/lzma/lzma_encoder_private.h
@@ -21,20 +21,27 @@
#ifndef LZMA_LZMA_ENCODER_PRIVATE_H
#define LZMA_LZMA_ENCODER_PRIVATE_H
-#include "lzma_encoder.h"
-#include "lzma_common.h"
#include "lz_encoder.h"
#include "range_encoder.h"
+#include "lzma_common.h"
+#include "lzma_encoder.h"
+
+// Macro to compare if the first two bytes in two buffers differ. This is
+// needed in lzma_lzma_optimum_*() to test if the match is at least
+// MATCH_LEN_MIN bytes. Unaligned access gives tiny gain so there's no
+// reason to not use it when it is supported.
+#ifdef HAVE_FAST_UNALIGNED_ACCESS
+# define not_equal_16(a, b) \
+ (*(const uint16_t *)(a) != *(const uint16_t *)(b))
+#else
+# define not_equal_16(a, b) \
+ ((a)[0] != (b)[0] || (a)[1] != (b)[1])
+#endif
-#define move_pos(num) \
-do { \
- assert((int32_t)(num) >= 0); \
- if ((num) != 0) { \
- coder->additional_offset += num; \
- coder->lz.skip(&coder->lz, num); \
- } \
-} while (0)
+
+// Optimal - Number of entries in the optimum array.
+#define OPTS (1 << 12)
typedef struct {
@@ -54,7 +61,7 @@ typedef struct {
typedef struct {
lzma_lzma_state state;
- bool prev_1_is_char;
+ bool prev_1_is_literal;
bool prev_2;
uint32_t pos_prev_2;
@@ -70,132 +77,79 @@ typedef struct {
struct lzma_coder_s {
- // Next coder in the chain
- lzma_next_coder next;
-
- // In window and match finder
- lzma_lz_encoder lz;
-
- // Range encoder
+ /// Range encoder
lzma_range_encoder rc;
- // State
+ /// State
lzma_lzma_state state;
- uint8_t previous_byte;
+
+ /// The four most recent match distances
uint32_t reps[REP_DISTANCES];
- // Misc
- uint32_t match_distances[MATCH_MAX_LEN * 2 + 2 + 1];
- uint32_t num_distance_pairs;
- uint32_t additional_offset;
- uint32_t now_pos; // Lowest 32 bits are enough here.
- bool best_compression; ///< True when LZMA_MODE_BEST is used
+ /// Array of match candidates
+ lzma_match matches[MATCH_LEN_MAX + 1];
+
+ /// Number of match candidates in matches[]
+ uint32_t matches_count;
+
+ /// Varibale to hold the length of the longest match between calls
+ /// to lzma_lzma_optimum_*().
+ uint32_t longest_match_length;
+
+ /// True if using getoptimumfast
+ bool fast_mode;
+
+ /// True if the encoder has been initialized by encoding the first
+ /// byte as a literal.
bool is_initialized;
+
+ /// True if the range encoder has been flushed, but not all bytes
+ /// have been written to the output buffer yet.
bool is_flushed;
- bool write_eopm;
- // Literal encoder
- lzma_literal_coder literal_coder;
+ uint32_t pos_mask; ///< (1 << pos_bits) - 1
+ uint32_t literal_context_bits;
+ uint32_t literal_pos_mask;
- // Bit encoders
+ // These are the same as in lzma_decoder.c. See comments there.
+ probability literal[LITERAL_CODERS_MAX][LITERAL_CODER_SIZE];
probability is_match[STATES][POS_STATES_MAX];
probability is_rep[STATES];
probability is_rep0[STATES];
probability is_rep1[STATES];
probability is_rep2[STATES];
probability is_rep0_long[STATES][POS_STATES_MAX];
- probability pos_encoders[FULL_DISTANCES - END_POS_MODEL_INDEX];
+ probability pos_slot[LEN_TO_POS_STATES][POS_SLOTS];
+ probability pos_special[FULL_DISTANCES - END_POS_MODEL_INDEX];
+ probability pos_align[ALIGN_TABLE_SIZE];
- // Bit Tree Encoders
- probability pos_slot_encoder[LEN_TO_POS_STATES][1 << POS_SLOT_BITS];
- probability pos_align_encoder[1 << ALIGN_BITS];
-
- // Length encoders
+ // These are the same as in lzma_decoder.c except that the encoders
+ // include also price tables.
lzma_length_encoder match_len_encoder;
lzma_length_encoder rep_len_encoder;
- lzma_length_encoder *prev_len_encoder;
- // Optimal
- lzma_optimal optimum[OPTS];
- uint32_t optimum_end_index;
- uint32_t optimum_current_index;
- uint32_t longest_match_length;
- bool longest_match_was_found;
-
- // Prices
- uint32_t pos_slot_prices[LEN_TO_POS_STATES][DIST_TABLE_SIZE_MAX];
+ // Price tables
+ uint32_t pos_slot_prices[LEN_TO_POS_STATES][POS_SLOTS];
uint32_t distances_prices[LEN_TO_POS_STATES][FULL_DISTANCES];
- uint32_t align_prices[ALIGN_TABLE_SIZE];
- uint32_t align_price_count;
uint32_t dist_table_size;
uint32_t match_price_count;
- // LZMA specific settings
- uint32_t dictionary_size; ///< Size in bytes
- uint32_t fast_bytes;
- uint32_t pos_state_bits;
- uint32_t pos_mask; ///< (1 << pos_state_bits) - 1
-};
-
-
-extern void lzma_length_encoder_update_table(lzma_length_encoder *lencoder,
- const uint32_t pos_state);
+ uint32_t align_prices[ALIGN_TABLE_SIZE];
+ uint32_t align_price_count;
-extern bool lzma_lzma_encode(lzma_coder *coder, uint8_t *restrict out,
- size_t *restrict out_pos, size_t out_size);
+ // Optimal
+ uint32_t opts_end_index;
+ uint32_t opts_current_index;
+ lzma_optimal opts[OPTS];
+};
-extern void lzma_get_optimum(lzma_coder *restrict coder,
- uint32_t *restrict back_res, uint32_t *restrict len_res);
-extern void lzma_get_optimum_fast(lzma_coder *restrict coder,
+extern void lzma_lzma_optimum_fast(
+ lzma_coder *restrict coder, lzma_mf *restrict mf,
uint32_t *restrict back_res, uint32_t *restrict len_res);
-
-// NOTE: Don't add 'restrict'.
-static inline void
-lzma_read_match_distances(lzma_coder *coder,
- uint32_t *len_res, uint32_t *num_distance_pairs)
-{
- *len_res = 0;
-
- coder->lz.get_matches(&coder->lz, coder->match_distances);
-
- *num_distance_pairs = coder->match_distances[0];
-
- if (*num_distance_pairs > 0) {
- *len_res = coder->match_distances[*num_distance_pairs - 1];
- assert(*len_res <= MATCH_MAX_LEN);
-
- if (*len_res == coder->fast_bytes) {
- uint32_t offset = *len_res - 1;
- const uint32_t distance = coder->match_distances[
- *num_distance_pairs] + 1;
- uint32_t limit = MATCH_MAX_LEN - *len_res;
-
- assert(offset + limit < coder->lz.keep_size_after);
- assert(coder->lz.read_pos <= coder->lz.write_pos);
-
- // If we are close to end of the stream, we may need
- // to limit the length of the match.
- if (coder->lz.write_pos - coder->lz.read_pos
- < offset + limit)
- limit = coder->lz.write_pos
- - (coder->lz.read_pos + offset);
-
- offset += coder->lz.read_pos;
- uint32_t i = 0;
- while (i < limit && coder->lz.buffer[offset + i]
- == coder->lz.buffer[
- offset + i - distance])
- ++i;
-
- *len_res += i;
- }
- }
-
- ++coder->additional_offset;
-
- return;
-}
+extern void lzma_lzma_optimum_normal(lzma_coder *restrict coder,
+ lzma_mf *restrict mf, uint32_t *restrict back_res,
+ uint32_t *restrict len_res, uint32_t position);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 11:10:44 +0000