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https://github.com/google/brotli.git
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105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
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/* Copyright 2022 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* Encoder state. */
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#ifndef BROTLI_ENC_STATE_H_
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#define BROTLI_ENC_STATE_H_
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#include <brotli/types.h>
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#include "command.h"
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#include "compress_fragment.h"
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#include "compress_fragment_two_pass.h"
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#include "hash.h"
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#include "memory.h"
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#include "params.h"
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#include "ringbuffer.h"
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typedef enum BrotliEncoderStreamState {
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/* Default state. */
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BROTLI_STREAM_PROCESSING = 0,
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/* Intermediate state; after next block is emitted, byte-padding should be
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performed before getting back to default state. */
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BROTLI_STREAM_FLUSH_REQUESTED = 1,
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/* Last metablock was produced; no more input is acceptable. */
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BROTLI_STREAM_FINISHED = 2,
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/* Flushing compressed block and writing meta-data block header. */
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BROTLI_STREAM_METADATA_HEAD = 3,
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/* Writing metadata block body. */
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BROTLI_STREAM_METADATA_BODY = 4
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} BrotliEncoderStreamState;
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typedef enum BrotliEncoderFlintState {
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BROTLI_FLINT_NEEDS_2_BYTES = 2,
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BROTLI_FLINT_NEEDS_1_BYTE = 1,
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BROTLI_FLINT_WAITING_FOR_PROCESSING = 0,
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BROTLI_FLINT_WAITING_FOR_FLUSHING = -1,
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BROTLI_FLINT_DONE = -2
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} BrotliEncoderFlintState;
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typedef struct BrotliEncoderStateStruct {
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BrotliEncoderParams params;
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MemoryManager memory_manager_;
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uint64_t input_pos_;
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RingBuffer ringbuffer_;
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size_t cmd_alloc_size_;
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Command* commands_;
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size_t num_commands_;
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size_t num_literals_;
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size_t last_insert_len_;
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uint64_t last_flush_pos_;
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uint64_t last_processed_pos_;
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int dist_cache_[BROTLI_NUM_DISTANCE_SHORT_CODES];
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int saved_dist_cache_[4];
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uint16_t last_bytes_;
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uint8_t last_bytes_bits_;
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/* "Flint" is a tiny uncompressed block emitted before the continuation
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block to unwire literal context from previous data. Despite being int8_t,
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field is actually BrotliEncoderFlintState enum. */
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int8_t flint_;
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uint8_t prev_byte_;
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uint8_t prev_byte2_;
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size_t storage_size_;
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uint8_t* storage_;
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Hasher hasher_;
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/* Hash table for FAST_ONE_PASS_COMPRESSION_QUALITY mode. */
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int small_table_[1 << 10]; /* 4KiB */
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int* large_table_; /* Allocated only when needed */
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size_t large_table_size_;
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BrotliOnePassArena* one_pass_arena_;
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BrotliTwoPassArena* two_pass_arena_;
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/* Command and literal buffers for FAST_TWO_PASS_COMPRESSION_QUALITY. */
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uint32_t* command_buf_;
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uint8_t* literal_buf_;
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uint64_t total_in_;
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uint8_t* next_out_;
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size_t available_out_;
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uint64_t total_out_;
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/* Temporary buffer for padding flush bits or metadata block header / body. */
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union {
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uint64_t u64[2];
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uint8_t u8[16];
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} tiny_buf_;
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uint32_t remaining_metadata_bytes_;
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BrotliEncoderStreamState stream_state_;
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BROTLI_BOOL is_last_block_emitted_;
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BROTLI_BOOL is_initialized_;
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} BrotliEncoderStateStruct;
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typedef struct BrotliEncoderStateStruct BrotliEncoderStateInternal;
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#define BrotliEncoderState BrotliEncoderStateInternal
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#endif // BROTLI_ENC_STATE_H_
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