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/*
*
* Copyright 2015-2016, 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_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H
#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H
#include <stddef.h>
#include <grpc/support/port_platform.h>
#include "src/core/ext/transport/chttp2/transport/frame.h"
#include "src/core/ext/transport/chttp2/transport/hpack_table.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/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 uint8_t *beg,
const uint8_t *end);
typedef struct {
char *str;
uint32_t length;
uint32_t 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;
/* what to do after skipping prioritization data */
grpc_chttp2_hpack_parser_state after_prioritization;
/* the value we're currently parsing */
union {
uint32_t *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 */
uint32_t index;
/* length of source bytes for the currently parsing string */
uint32_t strlen;
/* number of source bytes read for the currently parsing string */
uint32_t strgot;
/* huffman decoding state */
int16_t huff_state;
/* is the string being decoded binary? */
uint8_t binary;
/* is the current string huffman encoded? */
uint8_t huff;
/* is a dynamic table update allowed? */
uint8_t dynamic_table_update_allowed;
/* set by higher layers, used by grpc_chttp2_header_parser_parse to signal
it should append a metadata boundary at the end of frame */
uint8_t is_boundary;
uint8_t is_eof;
uint32_t base64_buffer;
/* hpack table */
grpc_chttp2_hptbl table;
};
void grpc_chttp2_hpack_parser_init(grpc_chttp2_hpack_parser *p);
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 uint8_t *beg, const uint8_t *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(
grpc_exec_ctx *exec_ctx, void *hpack_parser,
grpc_chttp2_transport_parsing *transport_parsing,
grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H */
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