mirror of
https://github.com/google/brotli.git
synced 2024-12-28 02:31:05 +00:00
11df843cf0
* pull `BROTLI_MAX_BACKWARD_LIMIT` to constants * split generic and Zopfli backward references code * pull hashers init and stitch invocation to encoder * make `dictionary_hash` a compilation unit * add `size hint` parameter * add new hasher * use `size hint` to pick new hasher for q4 * modernize clz guard (fix #495) * move `hash to binary tree` to separate file * add `Initialize` and `Cleanup` to all hashers * do not raise OOM if malloc(0) == NULL (fix #500)
61 lines
2.7 KiB
C
61 lines
2.7 KiB
C
/* Copyright 2015 Google Inc. All Rights Reserved.
|
|
|
|
Distributed under MIT license.
|
|
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
/* Function for fast encoding of an input fragment, independently from the input
|
|
history. This function uses one-pass processing: when we find a backward
|
|
match, we immediately emit the corresponding command and literal codes to
|
|
the bit stream. */
|
|
|
|
#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_
|
|
#define BROTLI_ENC_COMPRESS_FRAGMENT_H_
|
|
|
|
#include <brotli/types.h>
|
|
#include "./memory.h"
|
|
#include "./port.h"
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Compresses "input" string to the "*storage" buffer as one or more complete
|
|
meta-blocks, and updates the "*storage_ix" bit position.
|
|
|
|
If "is_last" is 1, emits an additional empty last meta-block.
|
|
|
|
"cmd_depth" and "cmd_bits" contain the command and distance prefix codes
|
|
(see comment in encode.h) used for the encoding of this input fragment.
|
|
If "is_last" is 0, they are updated to reflect the statistics
|
|
of this input fragment, to be used for the encoding of the next fragment.
|
|
|
|
"*cmd_code_numbits" is the number of bits of the compressed representation
|
|
of the command and distance prefix codes, and "cmd_code" is an array of
|
|
at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed
|
|
command and distance prefix codes. If "is_last" is 0, these are also
|
|
updated to represent the updated "cmd_depth" and "cmd_bits".
|
|
|
|
REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
|
|
REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
|
|
REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two
|
|
OUTPUT: maximal copy distance <= |input_size|
|
|
OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
|
|
BROTLI_INTERNAL void BrotliCompressFragmentFast(MemoryManager* m,
|
|
const uint8_t* input,
|
|
size_t input_size,
|
|
BROTLI_BOOL is_last,
|
|
int* table, size_t table_size,
|
|
uint8_t cmd_depth[128],
|
|
uint16_t cmd_bits[128],
|
|
size_t* cmd_code_numbits,
|
|
uint8_t* cmd_code,
|
|
size_t* storage_ix,
|
|
uint8_t* storage);
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */
|