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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef __GRPC_INTERNAL_TRANSPORT_CHTTP2_HPACK_PARSER_H__
#define __GRPC_INTERNAL_TRANSPORT_CHTTP2_HPACK_PARSER_H__
#include <stddef.h>
#include <grpc/support/port_platform.h>
#include "src/core/transport/chttp2/frame.h"
#include "src/core/transport/chttp2/hpack_table.h"
#include "src/core/transport/metadata.h"
typedef struct grpc_chttp2_hpack_parser grpc_chttp2_hpack_parser;
typedef int (*grpc_chttp2_hpack_parser_state)(grpc_chttp2_hpack_parser *p,
const gpr_uint8 *beg,
const gpr_uint8 *end);
typedef struct {
char *str;
gpr_uint32 length;
gpr_uint32 capacity;
} grpc_chttp2_hpack_parser_string;
struct grpc_chttp2_hpack_parser {
/* user specified callback for each header output */
void (*on_header)(void *user_data, grpc_mdelem *md);
void *on_header_user_data;
/* current parse state - or a function that implements it */
grpc_chttp2_hpack_parser_state state;
/* future states dependent on the opening op code */
const grpc_chttp2_hpack_parser_state *next_state;
/* the value we're currently parsing */
union {
gpr_uint32 *value;
grpc_chttp2_hpack_parser_string *str;
} parsing;
/* string parameters for each chunk */
grpc_chttp2_hpack_parser_string key;
grpc_chttp2_hpack_parser_string value;
/* parsed index */
gpr_uint32 index;
/* length of source bytes for the currently parsing string */
gpr_uint32 strlen;
/* number of source bytes read for the currently parsing string */
gpr_uint32 strgot;
/* huffman decoding state */
gpr_uint16 huff_state;
/* is the current string huffman encoded? */
gpr_uint8 huff;
/* set by higher layers, used by grpc_chttp2_header_parser_parse to signal
it should append a metadata boundary at the end of frame */
gpr_uint8 is_boundary;
gpr_uint8 is_eof;
/* hpack table */
grpc_chttp2_hptbl table;
};
void grpc_chttp2_hpack_parser_init(grpc_chttp2_hpack_parser *p,
grpc_mdctx *mdctx);
void grpc_chttp2_hpack_parser_destroy(grpc_chttp2_hpack_parser *p);
void grpc_chttp2_hpack_parser_set_has_priority(grpc_chttp2_hpack_parser *p);
/* returns 1 on success, 0 on error */
int grpc_chttp2_hpack_parser_parse(grpc_chttp2_hpack_parser *p,
const gpr_uint8 *beg, const gpr_uint8 *end);
/* wraps grpc_chttp2_hpack_parser_parse to provide a frame level parser for
the transport */
grpc_chttp2_parse_error grpc_chttp2_header_parser_parse(
void *hpack_parser, grpc_chttp2_parse_state *state, gpr_slice slice,
int is_last);
#endif /* __GRPC_INTERNAL_TRANSPORT_CHTTP2_HPACK_PARSER_H__ */
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