| /* Copyright 2015 Google Inc. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| #include "./huffman.h" |
| #include "./state.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| void BrotliStateInit(BrotliState* s) { |
| s->state = BROTLI_STATE_UNINITED; |
| s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; |
| s->substate_tree_group = BROTLI_STATE_TREE_GROUP_NONE; |
| s->substate_context_map = BROTLI_STATE_CONTEXT_MAP_NONE; |
| s->substate_uncompressed = BROTLI_STATE_UNCOMPRESSED_NONE; |
| s->substate_huffman = BROTLI_STATE_HUFFMAN_NONE; |
| |
| s->block_type_trees = NULL; |
| s->block_len_trees = NULL; |
| s->ringbuffer = NULL; |
| |
| s->context_map = NULL; |
| s->context_modes = NULL; |
| s->dist_context_map = NULL; |
| s->context_map_slice = NULL; |
| s->dist_context_map_slice = NULL; |
| |
| s->literal_hgroup.codes = NULL; |
| s->literal_hgroup.htrees = NULL; |
| s->insert_copy_hgroup.codes = NULL; |
| s->insert_copy_hgroup.htrees = NULL; |
| s->distance_hgroup.codes = NULL; |
| s->distance_hgroup.htrees = NULL; |
| |
| |
| s->custom_dict = NULL; |
| s->custom_dict_size = 0; |
| |
| s->is_last_metablock = 0; |
| s->window_bits = 0; |
| s->max_distance = 0; |
| s->dist_rb[0] = 16; |
| s->dist_rb[1] = 15; |
| s->dist_rb[2] = 11; |
| s->dist_rb[3] = 4; |
| s->dist_rb_idx = 0; |
| s->block_type_trees = NULL; |
| s->block_len_trees = NULL; |
| |
| /* Make small negative indexes addressable. */ |
| s->symbol_lists = &s->symbols_lists_array[BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1]; |
| |
| s->mtf_upper_bound = 255; |
| } |
| |
| void BrotliStateMetablockBegin(BrotliState* s) { |
| s->meta_block_remaining_len = 0; |
| s->block_length[0] = 1 << 28; |
| s->block_length[1] = 1 << 28; |
| s->block_length[2] = 1 << 28; |
| s->num_block_types[0] = 1; |
| s->num_block_types[1] = 1; |
| s->num_block_types[2] = 1; |
| s->block_type_rb[0] = 1; |
| s->block_type_rb[1] = 0; |
| s->block_type_rb[2] = 1; |
| s->block_type_rb[3] = 0; |
| s->block_type_rb[4] = 1; |
| s->block_type_rb[5] = 0; |
| s->context_map = NULL; |
| s->context_modes = NULL; |
| s->dist_context_map = NULL; |
| s->context_map_slice = NULL; |
| s->literal_htree_index = 0; |
| s->literal_htree = NULL; |
| s->dist_context_map_slice = NULL; |
| s->dist_htree_index = 0; |
| s->context_lookup1 = NULL; |
| s->context_lookup2 = NULL; |
| s->literal_hgroup.codes = NULL; |
| s->literal_hgroup.htrees = NULL; |
| s->insert_copy_hgroup.codes = NULL; |
| s->insert_copy_hgroup.htrees = NULL; |
| s->distance_hgroup.codes = NULL; |
| s->distance_hgroup.htrees = NULL; |
| } |
| |
| void BrotliStateCleanupAfterMetablock(BrotliState* s) { |
| if (s->context_modes != 0) { |
| free(s->context_modes); |
| s->context_modes = NULL; |
| } |
| if (s->context_map != 0) { |
| free(s->context_map); |
| s->context_map = NULL; |
| } |
| if (s->dist_context_map != 0) { |
| free(s->dist_context_map); |
| s->dist_context_map = NULL; |
| } |
| |
| BrotliHuffmanTreeGroupRelease(&s->literal_hgroup); |
| BrotliHuffmanTreeGroupRelease(&s->insert_copy_hgroup); |
| BrotliHuffmanTreeGroupRelease(&s->distance_hgroup); |
| s->literal_hgroup.codes = NULL; |
| s->literal_hgroup.htrees = NULL; |
| s->insert_copy_hgroup.codes = NULL; |
| s->insert_copy_hgroup.htrees = NULL; |
| s->distance_hgroup.codes = NULL; |
| s->distance_hgroup.htrees = NULL; |
| } |
| |
| void BrotliStateCleanup(BrotliState* s) { |
| if (s->context_modes != 0) { |
| free(s->context_modes); |
| } |
| if (s->context_map != 0) { |
| free(s->context_map); |
| } |
| if (s->dist_context_map != 0) { |
| free(s->dist_context_map); |
| } |
| BrotliHuffmanTreeGroupRelease(&s->literal_hgroup); |
| BrotliHuffmanTreeGroupRelease(&s->insert_copy_hgroup); |
| BrotliHuffmanTreeGroupRelease(&s->distance_hgroup); |
| |
| if (s->ringbuffer != 0) { |
| free(s->ringbuffer); |
| } |
| if (s->block_type_trees != 0) { |
| free(s->block_type_trees); |
| } |
| } |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } /* extern "C" */ |
| #endif |