kc3-lang/brotli/dec/state.c

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• Hash : 4b2fd00e
  Author :
  Date : 2015-08-10T16:39:50
  

  Use a single lookup table for insert/copy offsets and extra bits.
  
  Remove safe_malloc.c since all the bounds checking is done inside
  decode.c now.
  

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• dec/state.c

• /* 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->sub0_state = BROTLI_STATE_SUB0_NONE;
    s->sub1_state = BROTLI_STATE_SUB1_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->code_lengths = NULL;
    s->context_map_table = NULL;
  
    s->custom_dict = NULL;
    s->custom_dict_size = 0;
  
    s->input_end = 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;
  
    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->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_map_table != 0) {
      free(s->context_map_table);
    }
    if (s->code_lengths != 0) {
      free(s->code_lengths);
    }
  
    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
  

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