62 lines
2.7 KiB
C
62 lines
2.7 KiB
C
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/* Copyright 2015 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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/* Function for fast encoding of an input fragment, independently from the input
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history. This function uses one-pass processing: when we find a backward
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match, we immediately emit the corresponding command and literal codes to
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the bit stream. */
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#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_
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#define BROTLI_ENC_COMPRESS_FRAGMENT_H_
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#include <brotli/types.h>
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#include "./memory.h"
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#include "./port.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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/* Compresses "input" string to the "*storage" buffer as one or more complete
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meta-blocks, and updates the "*storage_ix" bit position.
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If "is_last" is 1, emits an additional empty last meta-block.
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"cmd_depth" and "cmd_bits" contain the command and distance prefix codes
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(see comment in encode.h) used for the encoding of this input fragment.
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If "is_last" is 0, they are updated to reflect the statistics
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of this input fragment, to be used for the encoding of the next fragment.
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"*cmd_code_numbits" is the number of bits of the compressed representation
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of the command and distance prefix codes, and "cmd_code" is an array of
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at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed
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command and distance prefix codes. If "is_last" is 0, these are also
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updated to represent the updated "cmd_depth" and "cmd_bits".
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REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
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REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24).
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REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
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REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two
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OUTPUT: maximal copy distance <= |input_size|
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OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
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BROTLI_INTERNAL void BrotliCompressFragmentFast(MemoryManager* m,
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const uint8_t* input,
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size_t input_size,
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BROTLI_BOOL is_last,
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int* table, size_t table_size,
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uint8_t cmd_depth[128],
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uint16_t cmd_bits[128],
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size_t* cmd_code_numbits,
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uint8_t* cmd_code,
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size_t* storage_ix,
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uint8_t* storage);
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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#endif /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */
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