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comparison mupdf-source/thirdparty/brotli/c/enc/state.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /* Copyright 2022 Google Inc. All Rights Reserved.
2
3 Distributed under MIT license.
4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
5 */
6
7 /* Encoder state. */
8
9 #ifndef BROTLI_ENC_STATE_H_
10 #define BROTLI_ENC_STATE_H_
11
12 #include <brotli/types.h>
13
14 #include "command.h"
15 #include "compress_fragment.h"
16 #include "compress_fragment_two_pass.h"
17 #include "hash.h"
18 #include "memory.h"
19 #include "params.h"
20 #include "ringbuffer.h"
21
22 typedef enum BrotliEncoderStreamState {
23 /* Default state. */
24 BROTLI_STREAM_PROCESSING = 0,
25 /* Intermediate state; after next block is emitted, byte-padding should be
26 performed before getting back to default state. */
27 BROTLI_STREAM_FLUSH_REQUESTED = 1,
28 /* Last metablock was produced; no more input is acceptable. */
29 BROTLI_STREAM_FINISHED = 2,
30 /* Flushing compressed block and writing meta-data block header. */
31 BROTLI_STREAM_METADATA_HEAD = 3,
32 /* Writing metadata block body. */
33 BROTLI_STREAM_METADATA_BODY = 4
34 } BrotliEncoderStreamState;
35
36 typedef enum BrotliEncoderFlintState {
37 BROTLI_FLINT_NEEDS_2_BYTES = 2,
38 BROTLI_FLINT_NEEDS_1_BYTE = 1,
39 BROTLI_FLINT_WAITING_FOR_PROCESSING = 0,
40 BROTLI_FLINT_WAITING_FOR_FLUSHING = -1,
41 BROTLI_FLINT_DONE = -2
42 } BrotliEncoderFlintState;
43
44 typedef struct BrotliEncoderStateStruct {
45 BrotliEncoderParams params;
46
47 MemoryManager memory_manager_;
48
49 uint64_t input_pos_;
50 RingBuffer ringbuffer_;
51 size_t cmd_alloc_size_;
52 Command* commands_;
53 size_t num_commands_;
54 size_t num_literals_;
55 size_t last_insert_len_;
56 uint64_t last_flush_pos_;
57 uint64_t last_processed_pos_;
58 int dist_cache_[BROTLI_NUM_DISTANCE_SHORT_CODES];
59 int saved_dist_cache_[4];
60 uint16_t last_bytes_;
61 uint8_t last_bytes_bits_;
62 /* "Flint" is a tiny uncompressed block emitted before the continuation
63 block to unwire literal context from previous data. Despite being int8_t,
64 field is actually BrotliEncoderFlintState enum. */
65 int8_t flint_;
66 uint8_t prev_byte_;
67 uint8_t prev_byte2_;
68 size_t storage_size_;
69 uint8_t* storage_;
70
71 Hasher hasher_;
72
73 /* Hash table for FAST_ONE_PASS_COMPRESSION_QUALITY mode. */
74 int small_table_[1 << 10]; /* 4KiB */
75 int* large_table_; /* Allocated only when needed */
76 size_t large_table_size_;
77
78 BrotliOnePassArena* one_pass_arena_;
79 BrotliTwoPassArena* two_pass_arena_;
80
81 /* Command and literal buffers for FAST_TWO_PASS_COMPRESSION_QUALITY. */
82 uint32_t* command_buf_;
83 uint8_t* literal_buf_;
84
85 uint64_t total_in_;
86 uint8_t* next_out_;
87 size_t available_out_;
88 uint64_t total_out_;
89 /* Temporary buffer for padding flush bits or metadata block header / body. */
90 union {
91 uint64_t u64[2];
92 uint8_t u8[16];
93 } tiny_buf_;
94 uint32_t remaining_metadata_bytes_;
95 BrotliEncoderStreamState stream_state_;
96
97 BROTLI_BOOL is_last_block_emitted_;
98 BROTLI_BOOL is_initialized_;
99 } BrotliEncoderStateStruct;
100
101 typedef struct BrotliEncoderStateStruct BrotliEncoderStateInternal;
102 #define BrotliEncoderState BrotliEncoderStateInternal
103
104 #endif // BROTLI_ENC_STATE_H_