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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#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"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct grpc_chttp2_hpack_parser grpc_chttp2_hpack_parser;
typedef grpc_error *(*grpc_chttp2_hpack_parser_state)(
grpc_exec_ctx *exec_ctx, grpc_chttp2_hpack_parser *p, const uint8_t *beg,
const uint8_t *end);
typedef struct {
bool copied;
struct {
grpc_slice referenced;
struct {
char *str;
uint32_t length;
uint32_t capacity;
} copied;
} data;
} grpc_chttp2_hpack_parser_string;
struct grpc_chttp2_hpack_parser {
/* user specified callback for each header output */
void (*on_header)(grpc_exec_ctx *exec_ctx, void *user_data, grpc_mdelem md);
void *on_header_user_data;
grpc_error *last_error;
/* 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 refcount of the slice that we're currently parsing */
grpc_slice_refcount *current_slice_refcount;
/* 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_exec_ctx *exec_ctx,
grpc_chttp2_hpack_parser *p);
void grpc_chttp2_hpack_parser_destroy(grpc_exec_ctx *exec_ctx,
grpc_chttp2_hpack_parser *p);
void grpc_chttp2_hpack_parser_set_has_priority(grpc_chttp2_hpack_parser *p);
grpc_error *grpc_chttp2_hpack_parser_parse(grpc_exec_ctx *exec_ctx,
grpc_chttp2_hpack_parser *p,
grpc_slice slice);
/* wraps grpc_chttp2_hpack_parser_parse to provide a frame level parser for
the transport */
grpc_error *grpc_chttp2_header_parser_parse(grpc_exec_ctx *exec_ctx,
void *hpack_parser,
grpc_chttp2_transport *t,
grpc_chttp2_stream *s,
grpc_slice slice, int is_last);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H */
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