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Diffstat (limited to 'brotli/dec/huffman.h')
| -rw-r--r-- | brotli/dec/huffman.h | 63 |
1 files changed, 32 insertions, 31 deletions
diff --git a/brotli/dec/huffman.h b/brotli/dec/huffman.h index f1a671d..fbd0744 100644 --- a/brotli/dec/huffman.h +++ b/brotli/dec/huffman.h @@ -1,18 +1,19 @@ -// Copyright 2013 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. -// -// Utilities for building and looking up Huffman trees. +/* Copyright 2013 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. + + Utilities for building and looking up Huffman trees. +*/ #ifndef BROTLI_DEC_HUFFMAN_H_ #define BROTLI_DEC_HUFFMAN_H_ @@ -24,51 +25,51 @@ extern "C" { #endif -// A node of a Huffman tree. +/* A node of a Huffman tree. */ typedef struct { int symbol_; - int children_; // delta offset to both children (contiguous) or 0 if leaf. + int children_; /* delta offset to both children (contiguous) or 0 if leaf. */ } HuffmanTreeNode; -// Huffman Tree. +/* Huffman Tree. */ #define HUFF_LUT_BITS 7 #define HUFF_LUT (1U << HUFF_LUT_BITS) typedef struct HuffmanTree HuffmanTree; struct HuffmanTree { - // Fast lookup for short bit lengths. + /* Fast lookup for short bit lengths. */ uint8_t lut_bits_[HUFF_LUT]; int16_t lut_symbol_[HUFF_LUT]; int16_t lut_jump_[HUFF_LUT]; - // Complete tree for lookups. - HuffmanTreeNode* root_; // all the nodes, starting at root. - int max_nodes_; // max number of nodes - int num_nodes_; // number of currently occupied nodes + /* Complete tree for lookups. */ + HuffmanTreeNode* root_; /* all the nodes, starting at root. */ + int max_nodes_; /* max number of nodes */ + int num_nodes_; /* number of currently occupied nodes */ }; -// Returns true if the given node is not a leaf of the Huffman tree. +/* Returns true if the given node is not a leaf of the Huffman tree. */ static BROTLI_INLINE int HuffmanTreeNodeIsNotLeaf( const HuffmanTreeNode* const node) { return node->children_; } -// Go down one level. Most critical function. 'right_child' must be 0 or 1. +/* Go down one level. Most critical function. 'right_child' must be 0 or 1. */ static BROTLI_INLINE const HuffmanTreeNode* HuffmanTreeNextNode( const HuffmanTreeNode* node, int right_child) { return node + node->children_ + right_child; } -// Releases the nodes of the Huffman tree. -// Note: It does NOT free 'tree' itself. +/* Releases the nodes of the Huffman tree. */ +/* Note: It does NOT free 'tree' itself. */ void BrotliHuffmanTreeRelease(HuffmanTree* const tree); -// Builds Huffman tree assuming code lengths are implicitly in symbol order. -// Returns false in case of error (invalid tree or memory error). +/* Builds Huffman tree assuming code lengths are implicitly in symbol order. */ +/* Returns false in case of error (invalid tree or memory error). */ int BrotliHuffmanTreeBuildImplicit(HuffmanTree* const tree, const uint8_t* const code_lengths, int code_lengths_size); #if defined(__cplusplus) || defined(c_plusplus) -} // extern "C" +} /* extern "C" */ #endif -#endif // BROTLI_DEC_HUFFMAN_H_ +#endif /* BROTLI_DEC_HUFFMAN_H_ */ |