28 lines
870 B
C++
28 lines
870 B
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#ifndef LIB_JXL_HUFFMAN_TABLE_H_
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#define LIB_JXL_HUFFMAN_TABLE_H_
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#include <stdint.h>
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#include <stdlib.h>
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namespace jxl {
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struct HuffmanCode {
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uint8_t bits; /* number of bits used for this symbol */
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uint16_t value; /* symbol value or table offset */
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};
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/* Builds Huffman lookup table assuming code lengths are in symbol order. */
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/* Returns 0 in case of error (invalid tree or memory error), otherwise
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populated size of table. */
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uint32_t BuildHuffmanTable(HuffmanCode* root_table, int root_bits,
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const uint8_t* code_lengths,
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size_t code_lengths_size, uint16_t* count);
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} // namespace jxl
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#endif // LIB_JXL_HUFFMAN_TABLE_H_
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