| /* 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 two-pass processing: in the first pass we save |
| the found backward matches and literal bytes into a buffer, and in the |
| second pass we emit them into the bit stream using prefix codes built based |
| on the actual command and literal byte histograms. */ |
| |
| #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ |
| #define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ |
| |
| #include "../common/platform.h" |
| #include <brotli/types.h> |
| #include "./memory.h" |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17; |
| |
| /* 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. |
| |
| REQUIRES: "input_size" is greater than zero, or "is_last" is 1. |
| REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24). |
| REQUIRES: "command_buf" and "literal_buf" point to at least |
| kCompressFragmentTwoPassBlockSize long arrays. |
| REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. |
| REQUIRES: "table_size" is a power of two |
| OUTPUT: maximal copy distance <= |input_size| |
| OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */ |
| BROTLI_INTERNAL void BrotliCompressFragmentTwoPass(MemoryManager* m, |
| const uint8_t* input, |
| size_t input_size, |
| BROTLI_BOOL is_last, |
| uint32_t* command_buf, |
| uint8_t* literal_buf, |
| int* table, |
| size_t table_size, |
| size_t* storage_ix, |
| uint8_t* storage); |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } /* extern "C" */ |
| #endif |
| |
| #endif /* BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ */ |