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Editing: nghttp2_hd_huffman.h

/*
 * nghttp2 - HTTP/2 C Library
 *
 * Copyright (c) 2013 Tatsuhiro Tsujikawa
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef NGHTTP2_HD_HUFFMAN_H
#define NGHTTP2_HD_HUFFMAN_H

#include <stdint.h>
#include <arpa/inet.h>

typedef enum {
  /* FSA accepts this state as the end of huffman encoding
     sequence. */
  NGHTTP2_HUFF_ACCEPTED = 1 << 14,
  /* This state emits symbol */
  NGHTTP2_HUFF_SYM = 1 << 15,
} nghttp2_huff_decode_flag;

typedef struct {
  /* fstate is the current huffman decoding state, which is actually
     the node ID of internal huffman tree with
     nghttp2_huff_decode_flag OR-ed.  We have 257 leaf nodes, but they
     are identical to root node other than emitting a symbol, so we
     have 256 internal nodes [1..255], inclusive.  The node ID 256 is
     a special node and it is a terminal state that means decoding
     failed. */
  uint16_t fstate;
  /* symbol if NGHTTP2_HUFF_SYM flag set */
  uint8_t sym;
} nghttp2_huff_decode;

typedef nghttp2_huff_decode huff_decode_table_type[16];

typedef struct {
  /* fstate is the current huffman decoding state. */
  uint16_t fstate;
} nghttp2_hd_huff_decode_context;

typedef struct {
  /* The number of bits in this code */
  uint32_t nbits;
  /* Huffman code aligned to LSB */
  uint32_t code;
} nghttp2_huff_sym;

extern const nghttp2_huff_sym huff_sym_table[];
extern const nghttp2_huff_decode huff_decode_table[][16];

#endif /* NGHTTP2_HD_HUFFMAN_H */

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