You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
2.5 KiB
73 lines
2.5 KiB
4 years ago
|
/*
|
||
|
|
* 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
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
# include <config.h>
|
||
|
|
#endif /* HAVE_CONFIG_H */
|
||
|
|
|
||
|
|
#include <nghttp2/nghttp2.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 */
|