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nghttp3.h
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nghttp3.h
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/*
* nghttp3
*
* Copyright (c) 2018 nghttp3 contributors
* Copyright (c) 2017 ngtcp2 contributors
* Copyright (c) 2017 nghttp2 contributors
*
* 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 NGHTTP3_H
#define NGHTTP3_H
/* Define WIN32 when build target is Win32 API (borrowed from
libcurl) */
#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
# define WIN32
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#if defined(_MSC_VER) && (_MSC_VER < 1800)
/* MSVC < 2013 does not have inttypes.h because it is not C99
compliant. See compiler macros and version number in
https://sourceforge.net/p/predef/wiki/Compilers/ */
# include <stdint.h>
#else /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
# include <inttypes.h>
#endif /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
#include <sys/types.h>
#include <stdarg.h>
#include <stddef.h>
#include <nghttp3/version.h>
#ifdef NGHTTP3_STATICLIB
# define NGHTTP3_EXTERN
#elif defined(WIN32)
# ifdef BUILDING_NGHTTP3
# define NGHTTP3_EXTERN __declspec(dllexport)
# else /* !BUILDING_NGHTTP3 */
# define NGHTTP3_EXTERN __declspec(dllimport)
# endif /* !BUILDING_NGHTTP3 */
#else /* !defined(WIN32) */
# ifdef BUILDING_NGHTTP3
# define NGHTTP3_EXTERN __attribute__((visibility("default")))
# else /* !BUILDING_NGHTTP3 */
# define NGHTTP3_EXTERN
# endif /* !BUILDING_NGHTTP3 */
#endif /* !defined(WIN32) */
typedef ptrdiff_t nghttp3_ssize;
/* NGHTTP3_ALPN_H3 is a serialized form of HTTP/3 ALPN protocol
identifier this library supports. Notice that the first byte is
the length of the following protocol identifier. */
#define NGHTTP3_ALPN_H3 "\x5h3-29"
typedef enum {
NGHTTP3_ERR_INVALID_ARGUMENT = -101,
NGHTTP3_ERR_NOBUF = -102,
NGHTTP3_ERR_INVALID_STATE = -103,
NGHTTP3_ERR_WOULDBLOCK = -104,
NGHTTP3_ERR_STREAM_IN_USE = -105,
NGHTTP3_ERR_PUSH_ID_BLOCKED = -106,
NGHTTP3_ERR_MALFORMED_HTTP_HEADER = -107,
NGHTTP3_ERR_REMOVE_HTTP_HEADER = -108,
NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING = -109,
NGHTTP3_ERR_TOO_LATE = -110,
NGHTTP3_ERR_QPACK_FATAL = -111,
NGHTTP3_ERR_QPACK_HEADER_TOO_LARGE = -112,
NGHTTP3_ERR_IGNORE_STREAM = -113,
NGHTTP3_ERR_STREAM_NOT_FOUND = -114,
NGHTTP3_ERR_IGNORE_PUSH_PROMISE = -115,
NGHTTP3_ERR_QPACK_DECOMPRESSION_FAILED = -402,
NGHTTP3_ERR_QPACK_ENCODER_STREAM_ERROR = -403,
NGHTTP3_ERR_QPACK_DECODER_STREAM_ERROR = -404,
NGHTTP3_ERR_H3_FRAME_UNEXPECTED = -408,
NGHTTP3_ERR_H3_FRAME_ERROR = -409,
NGHTTP3_ERR_H3_MISSING_SETTINGS = -665,
NGHTTP3_ERR_H3_INTERNAL_ERROR = -667,
NGHTTP3_ERR_H3_CLOSED_CRITICAL_STREAM = -668,
NGHTTP3_ERR_H3_GENERAL_PROTOCOL_ERROR = -669,
NGHTTP3_ERR_H3_ID_ERROR = -670,
NGHTTP3_ERR_H3_SETTINGS_ERROR = -671,
NGHTTP3_ERR_H3_STREAM_CREATION_ERROR = -672,
NGHTTP3_ERR_FATAL = -900,
NGHTTP3_ERR_NOMEM = -901,
NGHTTP3_ERR_CALLBACK_FAILURE = -902
} nghttp3_lib_error;
#define NGHTTP3_H3_NO_ERROR 0x0100
#define NGHTTP3_H3_GENERAL_PROTOCOL_ERROR 0x0101
#define NGHTTP3_H3_INTERNAL_ERROR 0x0102
#define NGHTTP3_H3_STREAM_CREATION_ERROR 0x0103
#define NGHTTP3_H3_CLOSED_CRITICAL_STREAM 0x0104
#define NGHTTP3_H3_FRAME_UNEXPECTED 0x0105
#define NGHTTP3_H3_FRAME_ERROR 0x0106
#define NGHTTP3_H3_EXCESSIVE_LOAD 0x0107
#define NGHTTP3_H3_ID_ERROR 0x0108
#define NGHTTP3_H3_SETTINGS_ERROR 0x0109
#define NGHTTP3_H3_MISSING_SETTINGS 0x010a
#define NGHTTP3_H3_REQUEST_REJECTED 0x010b
#define NGHTTP3_H3_REQUEST_CANCELLED 0x010c
#define NGHTTP3_H3_REQUEST_INCOMPLETE 0x010d
#define NGHTTP3_H3_CONNECT_ERROR 0x010f
#define NGHTTP3_H3_VERSION_FALLBACK 0x0110
#define NGHTTP3_QPACK_DECOMPRESSION_FAILED 0x0200
#define NGHTTP3_QPACK_ENCODER_STREAM_ERROR 0x0201
#define NGHTTP3_QPACK_DECODER_STREAM_ERROR 0x0202
/**
* @functypedef
*
* Custom memory allocator to replace malloc(). The |mem_user_data|
* is the mem_user_data member of :type:`nghttp3_mem` structure.
*/
typedef void *(*nghttp3_malloc)(size_t size, void *mem_user_data);
/**
* @functypedef
*
* Custom memory allocator to replace free(). The |mem_user_data| is
* the mem_user_data member of :type:`nghttp3_mem` structure.
*/
typedef void (*nghttp3_free)(void *ptr, void *mem_user_data);
/**
* @functypedef
*
* Custom memory allocator to replace calloc(). The |mem_user_data|
* is the mem_user_data member of :type:`nghttp3_mem` structure.
*/
typedef void *(*nghttp3_calloc)(size_t nmemb, size_t size, void *mem_user_data);
/**
* @functypedef
*
* Custom memory allocator to replace realloc(). The |mem_user_data|
* is the mem_user_data member of :type:`nghttp3_mem` structure.
*/
typedef void *(*nghttp3_realloc)(void *ptr, size_t size, void *mem_user_data);
/**
* @struct
*
* Custom memory allocator functions and user defined pointer. The
* |mem_user_data| member is passed to each allocator function. This
* can be used, for example, to achieve per-session memory pool.
*
* In the following example code, ``my_malloc``, ``my_free``,
* ``my_calloc`` and ``my_realloc`` are the replacement of the
* standard allocators ``malloc``, ``free``, ``calloc`` and
* ``realloc`` respectively::
*
* void *my_malloc_cb(size_t size, void *mem_user_data) {
* return my_malloc(size);
* }
*
* void my_free_cb(void *ptr, void *mem_user_data) { my_free(ptr); }
*
* void *my_calloc_cb(size_t nmemb, size_t size, void *mem_user_data) {
* return my_calloc(nmemb, size);
* }
*
* void *my_realloc_cb(void *ptr, size_t size, void *mem_user_data) {
* return my_realloc(ptr, size);
* }
*
* void conn_new() {
* nghttp3_mem mem = {NULL, my_malloc_cb, my_free_cb, my_calloc_cb,
* my_realloc_cb};
*
* ...
* }
*/
typedef struct {
/**
* An arbitrary user supplied data. This is passed to each
* allocator function.
*/
void *mem_user_data;
/**
* Custom allocator function to replace malloc().
*/
nghttp3_malloc malloc;
/**
* Custom allocator function to replace free().
*/
nghttp3_free free;
/**
* Custom allocator function to replace calloc().
*/
nghttp3_calloc calloc;
/**
* Custom allocator function to replace realloc().
*/
nghttp3_realloc realloc;
} nghttp3_mem;
/**
* @function
*
* `nghttp3_mem_default` returns the default memory allocator which
* uses malloc/calloc/realloc/free.
*/
NGHTTP3_EXTERN const nghttp3_mem *nghttp3_mem_default(void);
/**
* @struct
*
* nghttp3_vec is struct iovec compatible structure to reference
* arbitrary array of bytes.
*/
typedef struct {
/**
* base points to the data.
*/
uint8_t *base;
/**
* len is the number of bytes which the buffer pointed by base
* contains.
*/
size_t len;
} nghttp3_vec;
struct nghttp3_rcbuf;
/**
* @struct
*
* :type:`nghttp3_rcbuf` is the object representing reference counted
* buffer. The details of this structure are intentionally hidden
* from the public API.
*/
typedef struct nghttp3_rcbuf nghttp3_rcbuf;
/**
* @function
*
* `nghttp3_rcbuf_incref` increments the reference count of |rcbuf| by
* 1.
*/
NGHTTP3_EXTERN void nghttp3_rcbuf_incref(nghttp3_rcbuf *rcbuf);
/**
* @function
*
* `nghttp3_rcbuf_decref` decrements the reference count of |rcbuf| by
* 1. If the reference count becomes zero, the object pointed by
* |rcbuf| will be freed. In this case, application must not use
* |rcbuf| again.
*/
NGHTTP3_EXTERN void nghttp3_rcbuf_decref(nghttp3_rcbuf *rcbuf);
/**
* @function
*
* `nghttp3_rcbuf_get_buf` returns the underlying buffer managed by
* |rcbuf|.
*/
NGHTTP3_EXTERN nghttp3_vec nghttp3_rcbuf_get_buf(const nghttp3_rcbuf *rcbuf);
/**
* @function
*
* `nghttp3_rcbuf_is_static` returns nonzero if the underlying buffer
* is statically allocated, and 0 otherwise. This can be useful for
* language bindings that wish to avoid creating duplicate strings for
* these buffers.
*/
NGHTTP3_EXTERN int nghttp3_rcbuf_is_static(const nghttp3_rcbuf *rcbuf);
/**
* @struct
*
* :type:`nghttp3_buf` is the variable size buffer.
*/
typedef struct {
/**
* begin points to the beginning of the buffer.
*/
uint8_t *begin;
/**
* end points to the one beyond of the last byte of the buffer
*/
uint8_t *end;
/**
* pos pointers to the start of data. Typically, this points to the
* point that next data should be read. Initially, it points to
* |begin|.
*/
uint8_t *pos;
/**
* last points to the one beyond of the last data of the buffer.
* Typically, new data is written at this point. Initially, it
* points to |begin|.
*/
uint8_t *last;
} nghttp3_buf;
/**
* @function
*
* `nghttp3_buf_init` initializes empty |buf|.
*/
NGHTTP3_EXTERN void nghttp3_buf_init(nghttp3_buf *buf);
/**
* @function
*
* `nghttp3_buf_free` frees resources allocated for |buf| using |mem|
* as memory allocator. buf->begin must be a heap buffer allocated by
* |mem|.
*/
NGHTTP3_EXTERN void nghttp3_buf_free(nghttp3_buf *buf, const nghttp3_mem *mem);
/**
* @function
*
* `nghttp3_buf_left` returns the number of additional bytes which can
* be written to the underlying buffer. In other words, it returns
* buf->end - buf->last.
*/
NGHTTP3_EXTERN size_t nghttp3_buf_left(const nghttp3_buf *buf);
/**
* @function
*
* `nghttp3_buf_len` returns the number of bytes left to read. In
* other words, it returns buf->last - buf->pos.
*/
NGHTTP3_EXTERN size_t nghttp3_buf_len(const nghttp3_buf *buf);
/**
* @function
*
* `nghttp3_buf_reset` sets buf->pos and buf->last to buf->begin.
*/
NGHTTP3_EXTERN void nghttp3_buf_reset(nghttp3_buf *buf);
/**
* @enum
*
* :type:`nghttp3_nv_flag` is the flags for header field name/value
* pair.
*/
typedef enum {
/**
* :enum:`NGHTTP3_NV_FLAG_NONE` indicates no flag set.
*/
NGHTTP3_NV_FLAG_NONE = 0,
/**
* :enum:`NGHTTP3_NV_FLAG_NEVER_INDEX` indicates that this
* name/value pair must not be indexed. Other implementation calls
* this bit as "sensitive".
*/
NGHTTP3_NV_FLAG_NEVER_INDEX = 0x01,
/**
* :enum:`NGHTTP3_NV_FLAG_NO_COPY_NAME` is set solely by
* application. If this flag is set, the library does not make a
* copy of header field name. This could improve performance.
*/
NGHTTP3_NV_FLAG_NO_COPY_NAME = 0x02,
/**
* :enum:`NGHTTP3_NV_FLAG_NO_COPY_VALUE` is set solely by
* application. If this flag is set, the library does not make a
* copy of header field value. This could improve performance.
*/
NGHTTP3_NV_FLAG_NO_COPY_VALUE = 0x04
} nghttp3_nv_flag;
/**
* @struct
*
* :type:`nghttp3_nv` is the name/value pair, which mainly used to
* represent header fields.
*/
typedef struct {
/**
* name is the header field name.
*/
uint8_t *name;
/**
* value is the header field value.
*/
uint8_t *value;
/**
* namelen is the length of the |name|, excluding terminating NULL.
*/
size_t namelen;
/**
* valuelen is the length of the |value|, excluding terminating
* NULL.
*/
size_t valuelen;
/**
* flags is bitwise OR of one or more of :type:`nghttp3_nv_flag`.
*/
uint8_t flags;
} nghttp3_nv;
/* Generated by mkstatichdtbl.py */
typedef enum {
NGHTTP3_QPACK_TOKEN__AUTHORITY = 0,
NGHTTP3_QPACK_TOKEN__PATH = 8,
NGHTTP3_QPACK_TOKEN_AGE = 43,
NGHTTP3_QPACK_TOKEN_CONTENT_DISPOSITION = 52,
NGHTTP3_QPACK_TOKEN_CONTENT_LENGTH = 55,
NGHTTP3_QPACK_TOKEN_COOKIE = 68,
NGHTTP3_QPACK_TOKEN_DATE = 69,
NGHTTP3_QPACK_TOKEN_ETAG = 71,
NGHTTP3_QPACK_TOKEN_IF_MODIFIED_SINCE = 74,
NGHTTP3_QPACK_TOKEN_IF_NONE_MATCH = 75,
NGHTTP3_QPACK_TOKEN_LAST_MODIFIED = 77,
NGHTTP3_QPACK_TOKEN_LINK = 78,
NGHTTP3_QPACK_TOKEN_LOCATION = 79,
NGHTTP3_QPACK_TOKEN_REFERER = 83,
NGHTTP3_QPACK_TOKEN_SET_COOKIE = 85,
NGHTTP3_QPACK_TOKEN__METHOD = 1,
NGHTTP3_QPACK_TOKEN__SCHEME = 9,
NGHTTP3_QPACK_TOKEN__STATUS = 11,
NGHTTP3_QPACK_TOKEN_ACCEPT = 25,
NGHTTP3_QPACK_TOKEN_ACCEPT_ENCODING = 27,
NGHTTP3_QPACK_TOKEN_ACCEPT_RANGES = 29,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_ALLOW_HEADERS = 32,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_ALLOW_ORIGIN = 38,
NGHTTP3_QPACK_TOKEN_CACHE_CONTROL = 46,
NGHTTP3_QPACK_TOKEN_CONTENT_ENCODING = 53,
NGHTTP3_QPACK_TOKEN_CONTENT_TYPE = 57,
NGHTTP3_QPACK_TOKEN_RANGE = 82,
NGHTTP3_QPACK_TOKEN_STRICT_TRANSPORT_SECURITY = 86,
NGHTTP3_QPACK_TOKEN_VARY = 92,
NGHTTP3_QPACK_TOKEN_X_CONTENT_TYPE_OPTIONS = 94,
NGHTTP3_QPACK_TOKEN_X_XSS_PROTECTION = 98,
NGHTTP3_QPACK_TOKEN_ACCEPT_LANGUAGE = 28,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_ALLOW_CREDENTIALS = 30,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_ALLOW_METHODS = 35,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_EXPOSE_HEADERS = 39,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_REQUEST_HEADERS = 40,
NGHTTP3_QPACK_TOKEN_ACCESS_CONTROL_REQUEST_METHOD = 41,
NGHTTP3_QPACK_TOKEN_ALT_SVC = 44,
NGHTTP3_QPACK_TOKEN_AUTHORIZATION = 45,
NGHTTP3_QPACK_TOKEN_CONTENT_SECURITY_POLICY = 56,
NGHTTP3_QPACK_TOKEN_EARLY_DATA = 70,
NGHTTP3_QPACK_TOKEN_EXPECT_CT = 72,
NGHTTP3_QPACK_TOKEN_FORWARDED = 73,
NGHTTP3_QPACK_TOKEN_IF_RANGE = 76,
NGHTTP3_QPACK_TOKEN_ORIGIN = 80,
NGHTTP3_QPACK_TOKEN_PURPOSE = 81,
NGHTTP3_QPACK_TOKEN_SERVER = 84,
NGHTTP3_QPACK_TOKEN_TIMING_ALLOW_ORIGIN = 89,
NGHTTP3_QPACK_TOKEN_UPGRADE_INSECURE_REQUESTS = 90,
NGHTTP3_QPACK_TOKEN_USER_AGENT = 91,
NGHTTP3_QPACK_TOKEN_X_FORWARDED_FOR = 95,
NGHTTP3_QPACK_TOKEN_X_FRAME_OPTIONS = 96,
/* Additional header fields for HTTP messaging validation */
NGHTTP3_QPACK_TOKEN_HOST = 1000,
NGHTTP3_QPACK_TOKEN_CONNECTION,
NGHTTP3_QPACK_TOKEN_KEEP_ALIVE,
NGHTTP3_QPACK_TOKEN_PROXY_CONNECTION,
NGHTTP3_QPACK_TOKEN_TRANSFER_ENCODING,
NGHTTP3_QPACK_TOKEN_UPGRADE,
NGHTTP3_QPACK_TOKEN_TE,
NGHTTP3_QPACK_TOKEN__PROTOCOL,
NGHTTP3_QPACK_TOKEN_PRIORITY
} nghttp3_qpack_token;
/**
* @struct
*
* nghttp3_qpack_nv represents header field name/value pair just like
* :type:`nghttp3_nv`. It is an extended version of
* :type:`nghttp3_nv` and has reference counted buffers and tokens
* which might be useful for applications.
*/
typedef struct {
/* The buffer containing header field name. NULL-termination is
guaranteed. */
nghttp3_rcbuf *name;
/* The buffer containing header field value. NULL-termination is
guaranteed. */
nghttp3_rcbuf *value;
/* nghttp3_qpack_token value for name. It could be -1 if we have no
token for that header field name. */
int32_t token;
/* Bitwise OR of one or more of nghttp3_nv_flag. */
uint8_t flags;
} nghttp3_qpack_nv;
struct nghttp3_qpack_encoder;
/**
* @struct
*
* :type:`nghttp3_qpack_encoder` is QPACK encoder.
*/
typedef struct nghttp3_qpack_encoder nghttp3_qpack_encoder;
/**
* @function
*
* `nghttp3_qpack_encoder_new` initializes QPACK encoder. |pencoder|
* must be non-NULL pointer. |max_dtable_size| is the maximum dynamic
* table size. |max_blocked| is the maximum number of streams which
* can be blocked. |mem| is a memory allocator. This function
* allocates memory for :type:`nghttp3_qpack_encoder` itself and
* assigns its pointer to |*pencoder| if it succeeds.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
*/
NGHTTP3_EXTERN int nghttp3_qpack_encoder_new(nghttp3_qpack_encoder **pencoder,
size_t max_dtable_size,
size_t max_blocked,
const nghttp3_mem *mem);
/**
* @function
*
* `nghttp3_qpack_encoder_del` frees memory allocated for |encoder|.
* This function frees memory pointed by |encoder| itself.
*/
NGHTTP3_EXTERN void nghttp3_qpack_encoder_del(nghttp3_qpack_encoder *encoder);
/**
* @function
*
* `nghttp3_qpack_encoder_encode` encodes the list of header fields
* |nva|. |nvlen| is the length of |nva|. |stream_id| is the
* identifier of the stream which this header fields belong to. This
* function writes header block prefix, encoded header fields, and
* encoder stream to |pbuf|, |rbuf|, and |ebuf| respectively. The
* last field of nghttp3_buf will be adjusted when data is written.
* An application should write |pbuf| and |rbuf| to the request stream
* in this order.
*
* The buffer pointed by |pbuf|, |rbuf|, and |ebuf| can be empty
* buffer. It is fine to pass a buffer initialized by
* nghttp3_buf_init(buf). This function allocates memory for these
* buffers as necessary. In particular, it frees and expands buffer
* if the current capacity of buffer is not enough. If begin field of
* any buffer is not NULL, it must be allocated by the same memory
* allocator passed to `nghttp3_qpack_encoder_new()`.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory
* :enum:`NGHTTP3_ERR_QPACK_FATAL`
* |encoder| is in unrecoverable error state and cannot be used
* anymore.
*/
NGHTTP3_EXTERN int nghttp3_qpack_encoder_encode(
nghttp3_qpack_encoder *encoder, nghttp3_buf *pbuf, nghttp3_buf *rbuf,
nghttp3_buf *ebuf, int64_t stream_id, const nghttp3_nv *nva, size_t nvlen);
/**
* @function
*
* `nghttp3_qpack_encoder_read_decoder` reads decoder stream. The
* buffer pointed by |src| of length |srclen| contains decoder stream.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory
* :enum:`NGHTTP3_ERR_QPACK_FATAL`
* |encoder| is in unrecoverable error state and cannot be used
* anymore.
* :enum:`NGHTTP3_ERR_QPACK_DECODER_STREAM`
* |encoder| is unable to process input because it is malformed.
*/
NGHTTP3_EXTERN nghttp3_ssize nghttp3_qpack_encoder_read_decoder(
nghttp3_qpack_encoder *encoder, const uint8_t *src, size_t srclen);
/**
* @function
*
* `nghttp3_qpack_encoder_set_max_dtable_size` sets max dynamic table
* size to |max_dtable_size|.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* :enum:`NGHTTP3_ERR_INVALID_ARGUMENT`
* |max_dtable_size| exceeds the hard limit that decoder specifies.
*/
NGHTTP3_EXTERN int
nghttp3_qpack_encoder_set_max_dtable_size(nghttp3_qpack_encoder *encoder,
size_t max_dtable_size);
/**
* @function
*
* `nghttp3_qpack_encoder_set_hard_max_dtable_size` sets hard maximum
* dynamic table size to |hard_max_dtable_size|.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* TBD
*/
NGHTTP3_EXTERN int
nghttp3_qpack_encoder_set_hard_max_dtable_size(nghttp3_qpack_encoder *encoder,
size_t hard_max_dtable_size);
/**
* @function
*
* `nghttp3_qpack_encoder_set_max_blocked` sets the number of streams
* which can be blocked to |max_blocked|.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* TBD
*/
NGHTTP3_EXTERN int
nghttp3_qpack_encoder_set_max_blocked(nghttp3_qpack_encoder *encoder,
size_t max_blocked);
/**
* @function
*
* `nghttp3_qpack_encoder_ack_header` tells |encoder| that header
* block for a stream denoted by |stream_id| was acknowledged by
* decoder. This function is provided for debugging purpose only. In
* HTTP/3, |encoder| knows acknowledgement of header block by reading
* decoder stream with `nghttp3_qpack_encoder_read_decoder()`.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_encoder_ack_header(nghttp3_qpack_encoder *encoder,
int64_t stream_id);
/**
* @function
*
* `nghttp3_qpack_encoder_add_insert_count` increments known received
* count of |encoder| by |n|. This function is provided for debugging
* purpose only. In HTTP/3, |encoder| increments known received count
* by reading decoder stream with
* `nghttp3_qpack_encoder_read_decoder()`.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP3_QPACK_DECODER_STREAM`
* |n| is too large.
*/
NGHTTP3_EXTERN int
nghttp3_qpack_encoder_add_insert_count(nghttp3_qpack_encoder *encoder,
uint64_t n);
/**
* @function
*
* `nghttp3_qpack_encoder_ack_everything` tells |encoder| that all
* encoded header blocks are acknowledged. This function is provided
* for debugging purpose only. In HTTP/3, |encoder| knows this by
* reading decoder stream with `nghttp3_qpack_encoder_read_decoder()`.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_encoder_ack_everything(nghttp3_qpack_encoder *encoder);
/**
* @function
*
* `nghttp3_qpack_encoder_cancel_stream` tells |encoder| that stream
* denoted by |stream_id| is cancelled. This function is provided for
* debugging purpose only. In HTTP/3, |encoder| knows this by reading
* decoder stream with `nghttp3_qpack_encoder_read_decoder()`.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_encoder_cancel_stream(nghttp3_qpack_encoder *encoder,
int64_t stream_id);
/**
* @function
*
* `nghttp3_qpack_encoder_get_num_blocked` returns the number of
* streams which is potentially blocked at decoder side.
*/
NGHTTP3_EXTERN size_t
nghttp3_qpack_encoder_get_num_blocked(nghttp3_qpack_encoder *encoder);
struct nghttp3_qpack_stream_context;
/**
* @struct
*
* :type:`nghttp3_qpack_stream_context` is a decoder context for an
* individual stream.
*/
typedef struct nghttp3_qpack_stream_context nghttp3_qpack_stream_context;
/**
* @function
*
* `nghttp3_qpack_stream_context_new` initializes stream context.
* |psctx| must be non-NULL pointer. |stream_id| is stream ID. |mem|
* is a memory allocator. This function allocates memory for
* :type:`nghttp3_qpack_stream_context` itself and assigns its pointer
* to |*psctx| if it succeeds.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
*/
NGHTTP3_EXTERN int
nghttp3_qpack_stream_context_new(nghttp3_qpack_stream_context **psctx,
int64_t stream_id, const nghttp3_mem *mem);
/**
* @function
*
* `nghttp3_qpack_stream_context_del` frees memory allocated for
* |sctx|. This function frees memory pointed by |sctx| itself.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_stream_context_del(nghttp3_qpack_stream_context *sctx);
/**
* @function
*
* `nghttp3_qpack_stream_context_get_ricnt` returns required insert
* count.
*/
NGHTTP3_EXTERN uint64_t
nghttp3_qpack_stream_context_get_ricnt(nghttp3_qpack_stream_context *sctx);
struct nghttp3_qpack_decoder;
/**
* @struct
*
* `nghttp3_qpack_decoder` is QPACK decoder.
*/
typedef struct nghttp3_qpack_decoder nghttp3_qpack_decoder;
/**
* @function
*
* `nghttp3_qpack_decoder_new` initializes QPACK decoder. |pdecoder|
* must be non-NULL pointer. |max_dtable_size| is the maximum dynamic
* table size. |max_blocked| is the maximum number of streams which
* can be blocked. |mem| is a memory allocator. This function
* allocates memory for :type:`nghttp3_qpack_decoder` itself and
* assigns its pointer to |*pdecoder| if it succeeds.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
*/
NGHTTP3_EXTERN int nghttp3_qpack_decoder_new(nghttp3_qpack_decoder **pdecoder,
size_t max_dtable_size,
size_t max_blocked,
const nghttp3_mem *mem);
/**
* @function
*
* `nghttp3_qpack_decoder_del` frees memory allocated for |decoder|.
* This function frees memory pointed by |decoder| itself.
*/
NGHTTP3_EXTERN void nghttp3_qpack_decoder_del(nghttp3_qpack_decoder *decoder);
/**
* @function
*
* `nghttp3_qpack_decoder_read_encoder` reads encoder stream. The
* buffer pointed by |src| of length |srclen| contains encoder stream.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP3_ERR_QPACK_FATAL`
* |decoder| is in unrecoverable error state and cannot be used
* anymore.
* :enum:`NGHTTP3_ERR_QPACK_ENCODER_STREAM`
* Could not interpret encoder stream instruction.
*/
NGHTTP3_EXTERN nghttp3_ssize nghttp3_qpack_decoder_read_encoder(
nghttp3_qpack_decoder *decoder, const uint8_t *src, size_t srclen);
/**
* @function
*
* `nghttp3_qpack_decoder_get_icnt` returns insert count.
*/
NGHTTP3_EXTERN uint64_t
nghttp3_qpack_decoder_get_icnt(const nghttp3_qpack_decoder *decoder);
/**
* @enum
*
* :type:`nghttp3_qpack_decode_flag` is a set of flags for decoder.
*/
typedef enum {
/**
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_NONE` indicates that no flag
* set.
*/
NGHTTP3_QPACK_DECODE_FLAG_NONE,
/**
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_EMIT` indicates that a header
* field is successfully decoded.
*/
NGHTTP3_QPACK_DECODE_FLAG_EMIT = 0x01,
/**
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_FINAL` indicates that all header
* fields have been decoded.
*/
NGHTTP3_QPACK_DECODE_FLAG_FINAL = 0x02,
/**
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_BLOCKED` indicates that decoding
* has been blocked.
*/
NGHTTP3_QPACK_DECODE_FLAG_BLOCKED = 0x04
} nghttp3_qpack_decode_flag;
/**
* @function
*
* `nghttp3_qpack_decoder_read_request` reads request stream. The
* request stream is given as the buffer pointed by |src| of length
* |srclen|. |sctx| is the stream context and it must be initialized
* by `nghttp3_qpack_stream_context_init()`. |*pflags| must be
* non-NULL pointer. |nv| must be non-NULL pointer.
*
* If this function succeeds, it assigns flags to |*pflags|. If
* |*pflags| has :enum:`NGHTTP3_QPACK_DECODE_FLAG_EMIT` set, a decoded
* header field is assigned to |nv|. If |*pflags| has
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_FINAL` set, all header fields have
* been successfully decoded. If |*pflags| has
* :enum:`NGHTTP3_QPACK_DECODE_FLAG_BLOCKED` set, decoding is blocked
* due to required insert count.
*
* When a header field is decoded, an application receives it in |nv|.
* nv->name and nv->value are reference counted buffer, and their
* reference counts are already incremented for application use.
* Therefore, when application finishes processing the header field,
* it must call nghttp3_rcbuf_decref(nv->name) and
* nghttp3_rcbuf_decref(nv->value) or memory leak might occur.
*
* This function returns the number of bytes read, or one of the
* following negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP3_ERR_QPACK_FATAL`
* |decoder| is in unrecoverable error state and cannot be used
* anymore.
* :enum:`NGHTTP3_ERR_QPACK_DECOMPRESSION_FAILED`
* Could not interpret header block instruction.
* :enum:`NGHTTP3_ERR_QPACK_HEADER_TOO_LARGE`
* Header field is too large.
*/
NGHTTP3_EXTERN nghttp3_ssize nghttp3_qpack_decoder_read_request(
nghttp3_qpack_decoder *decoder, nghttp3_qpack_stream_context *sctx,
nghttp3_qpack_nv *nv, uint8_t *pflags, const uint8_t *src, size_t srclen,
int fin);
/**
* @function
*
* `nghttp3_qpack_decoder_write_decoder` writes decoder stream into
* |dbuf|.
*
* The caller must ensure that nghttp3_buf_left(dbuf) >=
* nghttp3_qpack_decoder_get_decoder_streamlen(decoder).
*/
NGHTTP3_EXTERN void
nghttp3_qpack_decoder_write_decoder(nghttp3_qpack_decoder *decoder,
nghttp3_buf *dbuf);
/**
* @function
*
* `nghttp3_qpack_decoder_get_decoder_streamlen` returns the length of
* decoder stream.
*/
NGHTTP3_EXTERN size_t
nghttp3_qpack_decoder_get_decoder_streamlen(nghttp3_qpack_decoder *decoder);
/**
* @function
*
* `nghttp3_qpack_decoder_cancel_stream` cancels header decoding for
* stream denoted by |stream_id|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP3_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP3_ERR_QPACK_FATAL`
* Decoder stream overflow.
*/
NGHTTP3_EXTERN int
nghttp3_qpack_decoder_cancel_stream(nghttp3_qpack_decoder *decoder,
int64_t stream_id);
/**
* @function
*
* `nghttp3_qpack_decoder_set_dtable_cap` sets |cap| as maximum
* dynamic table size. Normally, the maximum capacity is communicated
* in encoder stream. This function is provided for debugging and
* testing purpose.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_decoder_set_dtable_cap(nghttp3_qpack_decoder *decoder,
size_t cap);
/**
* @function
*
* `nghttp3_qpack_decoder_set_max_concurrent_streams` tells |decoder|
* the maximum number of concurrent streams that a remote endpoint can
* open, including both bidirectional and unidirectional streams which
* potentially receive QPACK encoded HEADERS frame. This value is
* used as a hint to limit the length of decoder stream.
*/
NGHTTP3_EXTERN void
nghttp3_qpack_decoder_set_max_concurrent_streams(nghttp3_qpack_decoder *decoder,
size_t max_concurrent_streams);
/**
* @function
*
* `nghttp3_strerror` returns textual representation of |liberr| which
* should be one of error codes defined in :type:`nghttp3_lib_error`.
*/
NGHTTP3_EXTERN const char *nghttp3_strerror(int liberr);
/**
* @function
*
* `nghttp3_err_infer_quic_app_error_code` returns a QUIC application
* error code which corresponds to |liberr|.
*/
NGHTTP3_EXTERN uint64_t nghttp3_err_infer_quic_app_error_code(int liberr);
/**
* @functypedef
*
* :type:`nghttp3_debug_vprintf_callback` is a callback function
* invoked when the library outputs debug logging. The function is
* called with arguments suitable for ``vfprintf(3)``
*
* The debug output is only enabled if the library is built with
* ``DEBUGBUILD`` macro defined.
*/
typedef void (*nghttp3_debug_vprintf_callback)(const char *format,
va_list args);
/**
* @function
*
* `nghttp3_set_debug_vprintf_callback` sets a debug output callback
* called by the library when built with ``DEBUGBUILD`` macro defined.
* If this option is not used, debug log is written into standard
* error output.
*
* For builds without ``DEBUGBUILD`` macro defined, this function is
* noop.
*