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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2013, 2014 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_H
#define NGHTTP2_H
/* Define WIN32 when build target is Win32 API (borrowed from
libcurl) */
#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
# define WIN32
#endif
/* Compatibility for non-Clang compilers */
#ifndef __has_declspec_attribute
# define __has_declspec_attribute(x) 0
#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 <string.h>
static inline uint8_t *nghttp2_cpymem(uint8_t *dest, const void *src, size_t len) {
if (len == 0) {
return dest;
}
memcpy(dest, src, len);
return dest + len;
}
#define nghttp2_min(A, B) ((A) < (B) ? (A) : (B))
#define nghttp2_max(A, B) ((A) > (B) ? (A) : (B))
#define DEBUGF(s, ...)
const char *nghttp2_strerror(int error_code);
#ifdef NGHTTP2_STATICLIB
# define NGHTTP2_EXTERN
#elif defined(WIN32) || (__has_declspec_attribute(dllexport) && \
__has_declspec_attribute(dllimport))
# ifdef BUILDING_NGHTTP2
# define NGHTTP2_EXTERN __declspec(dllexport)
# else /* !BUILDING_NGHTTP2 */
# define NGHTTP2_EXTERN __declspec(dllimport)
# endif /* !BUILDING_NGHTTP2 */
#else /* !defined(WIN32) */
# ifdef BUILDING_NGHTTP2
# define NGHTTP2_EXTERN __attribute__((visibility("default")))
# else /* !BUILDING_NGHTTP2 */
# define NGHTTP2_EXTERN
# endif /* !BUILDING_NGHTTP2 */
#endif /* !defined(WIN32) */
/**
* @macro
*
* The protocol version identification string of this library
* supports. This identifier is used if HTTP/2 is used over TLS.
*/
#define NGHTTP2_PROTO_VERSION_ID "h2"
/**
* @macro
*
* The length of :macro:`NGHTTP2_PROTO_VERSION_ID`.
*/
#define NGHTTP2_PROTO_VERSION_ID_LEN 2
/**
* @macro
*
* The serialized form of ALPN protocol identifier this library
* supports. Notice that first byte is the length of following
* protocol identifier. This is the same wire format of `TLS ALPN
* extension <https://tools.ietf.org/html/rfc7301>`_. This is useful
* to process incoming ALPN tokens in wire format.
*/
#define NGHTTP2_PROTO_ALPN "\x2h2"
/**
* @macro
*
* The length of :macro:`NGHTTP2_PROTO_ALPN`.
*/
#define NGHTTP2_PROTO_ALPN_LEN (sizeof(NGHTTP2_PROTO_ALPN) - 1)
/**
* @macro
*
* The protocol version identification string of this library
* supports. This identifier is used if HTTP/2 is used over cleartext
* TCP.
*/
#define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "h2c"
/**
* @macro
*
* The length of :macro:`NGHTTP2_CLEARTEXT_PROTO_VERSION_ID`.
*/
#define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN 3
/**
* @macro
*
* The age of :type:`nghttp2_info`
*/
#define NGHTTP2_VERSION_AGE 1
/**
* @struct
*
* This struct is what `nghttp2_version()` returns. It holds
* information about the particular nghttp2 version.
*/
typedef struct {
/**
* Age of this struct. This instance of nghttp2 sets it to
* :macro:`NGHTTP2_VERSION_AGE` but a future version may bump it and
* add more struct fields at the bottom
*/
int age;
/**
* the :macro:`NGHTTP2_VERSION_NUM` number (since age ==1)
*/
int version_num;
/**
* points to the :macro:`NGHTTP2_VERSION` string (since age ==1)
*/
const char *version_str;
/**
* points to the :macro:`NGHTTP2_PROTO_VERSION_ID` string this
* instance implements (since age ==1)
*/
const char *proto_str;
/* -------- the above fields all exist when age == 1 */
} nghttp2_info;
/**
* @macro
*
* The default weight of stream dependency.
*/
#define NGHTTP2_DEFAULT_WEIGHT 16
/**
* @macro
*
* The maximum weight of stream dependency.
*/
#define NGHTTP2_MAX_WEIGHT 256
/**
* @macro
*
* The minimum weight of stream dependency.
*/
#define NGHTTP2_MIN_WEIGHT 1
/**
* @macro
*
* The maximum window size
*/
#define NGHTTP2_MAX_WINDOW_SIZE ((int32_t)((1U << 31) - 1))
/**
* @macro
*
* The initial window size for stream level flow control.
*/
#define NGHTTP2_INITIAL_WINDOW_SIZE ((1 << 16) - 1)
/**
* @macro
*
* The initial window size for connection level flow control.
*/
#define NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE ((1 << 16) - 1)
/**
* @macro
*
* The default header table size.
*/
#define NGHTTP2_DEFAULT_HEADER_TABLE_SIZE (1 << 12)
/**
* @macro
*
* The client magic string, which is the first 24 bytes byte string of
* client connection preface.
*/
#define NGHTTP2_CLIENT_MAGIC "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
/**
* @macro
*
* The length of :macro:`NGHTTP2_CLIENT_MAGIC`.
*/
#define NGHTTP2_CLIENT_MAGIC_LEN 24
/**
* @macro
*
* The default max number of settings per SETTINGS frame
*/
#define NGHTTP2_DEFAULT_MAX_SETTINGS 32
/**
* @enum
*
* Error codes used in this library. The code range is [-999, -500],
* inclusive. The following values are defined:
*/
typedef enum {
/**
* Invalid argument passed.
*/
NGHTTP2_ERR_INVALID_ARGUMENT = -501,
/**
* Out of buffer space.
*/
NGHTTP2_ERR_BUFFER_ERROR = -502,
/**
* The specified protocol version is not supported.
*/
NGHTTP2_ERR_UNSUPPORTED_VERSION = -503,
/**
* Used as a return value from :type:`nghttp2_send_callback`,
* :type:`nghttp2_recv_callback` and
* :type:`nghttp2_send_data_callback` to indicate that the operation
* would block.
*/
NGHTTP2_ERR_WOULDBLOCK = -504,
/**
* General protocol error
*/
NGHTTP2_ERR_PROTO = -505,
/**
* The frame is invalid.
*/
NGHTTP2_ERR_INVALID_FRAME = -506,
/**
* The peer performed a shutdown on the connection.
*/
NGHTTP2_ERR_EOF = -507,
/**
* Used as a return value from
* :func:`nghttp2_data_source_read_callback` to indicate that data
* transfer is postponed. See
* :func:`nghttp2_data_source_read_callback` for details.
*/
NGHTTP2_ERR_DEFERRED = -508,
/**
* Stream ID has reached the maximum value. Therefore no stream ID
* is available.
*/
NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE = -509,
/**
* The stream is already closed; or the stream ID is invalid.
*/
NGHTTP2_ERR_STREAM_CLOSED = -510,
/**
* RST_STREAM has been added to the outbound queue. The stream is
* in closing state.
*/
NGHTTP2_ERR_STREAM_CLOSING = -511,
/**
* The transmission is not allowed for this stream (e.g., a frame
* with END_STREAM flag set has already sent).
*/
NGHTTP2_ERR_STREAM_SHUT_WR = -512,
/**
* The stream ID is invalid.
*/
NGHTTP2_ERR_INVALID_STREAM_ID = -513,
/**
* The state of the stream is not valid (e.g., DATA cannot be sent
* to the stream if response HEADERS has not been sent).
*/
NGHTTP2_ERR_INVALID_STREAM_STATE = -514,
/**
* Another DATA frame has already been deferred.
*/
NGHTTP2_ERR_DEFERRED_DATA_EXIST = -515,
/**
* Starting new stream is not allowed (e.g., GOAWAY has been sent
* and/or received).
*/
NGHTTP2_ERR_START_STREAM_NOT_ALLOWED = -516,
/**
* GOAWAY has already been sent.
*/
NGHTTP2_ERR_GOAWAY_ALREADY_SENT = -517,
/**
* The received frame contains the invalid header block (e.g., There
* are duplicate header names; or the header names are not encoded
* in US-ASCII character set and not lower cased; or the header name
* is zero-length string; or the header value contains multiple
* in-sequence NUL bytes).
*/
NGHTTP2_ERR_INVALID_HEADER_BLOCK = -518,
/**
* Indicates that the context is not suitable to perform the
* requested operation.
*/
NGHTTP2_ERR_INVALID_STATE = -519,
/**
* The user callback function failed due to the temporal error.
*/
NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE = -521,
/**
* The length of the frame is invalid, either too large or too small.
*/
NGHTTP2_ERR_FRAME_SIZE_ERROR = -522,
/**
* Header block inflate/deflate error.
*/
NGHTTP2_ERR_HEADER_COMP = -523,
/**
* Flow control error
*/
NGHTTP2_ERR_FLOW_CONTROL = -524,
/**
* Insufficient buffer size given to function.
*/
NGHTTP2_ERR_INSUFF_BUFSIZE = -525,
/**
* Callback was paused by the application
*/
NGHTTP2_ERR_PAUSE = -526,
/**
* There are too many in-flight SETTING frame and no more
* transmission of SETTINGS is allowed.
*/
NGHTTP2_ERR_TOO_MANY_INFLIGHT_SETTINGS = -527,
/**
* The server push is disabled.
*/
NGHTTP2_ERR_PUSH_DISABLED = -528,
/**
* DATA or HEADERS frame for a given stream has been already
* submitted and has not been fully processed yet. Application
* should wait for the transmission of the previously submitted
* frame before submitting another.
*/
NGHTTP2_ERR_DATA_EXIST = -529,
/**
* The current session is closing due to a connection error or
* `nghttp2_session_terminate_session()` is called.
*/
NGHTTP2_ERR_SESSION_CLOSING = -530,
/**
* Invalid HTTP header field was received and stream is going to be
* closed.
*/
NGHTTP2_ERR_HTTP_HEADER = -531,
/**
* Violation in HTTP messaging rule.
*/
NGHTTP2_ERR_HTTP_MESSAGING = -532,
/**
* Stream was refused.
*/
NGHTTP2_ERR_REFUSED_STREAM = -533,
/**
* Unexpected internal error, but recovered.
*/
NGHTTP2_ERR_INTERNAL = -534,
/**
* Indicates that a processing was canceled.
*/
NGHTTP2_ERR_CANCEL = -535,
/**
* When a local endpoint expects to receive SETTINGS frame, it
* receives an other type of frame.
*/
NGHTTP2_ERR_SETTINGS_EXPECTED = -536,
/**
* When a local endpoint receives too many settings entries
* in a single SETTINGS frame.
*/
NGHTTP2_ERR_TOO_MANY_SETTINGS = -537,
/**
* The errors < :enum:`nghttp2_error.NGHTTP2_ERR_FATAL` mean that
* the library is under unexpected condition and processing was
* terminated (e.g., out of memory). If application receives this
* error code, it must stop using that :type:`nghttp2_session`
* object and only allowed operation for that object is deallocate
* it using `nghttp2_session_del()`.
*/
NGHTTP2_ERR_FATAL = -900,
/**
* Out of memory. This is a fatal error.
*/
NGHTTP2_ERR_NOMEM = -901,
/**
* The user callback function failed. This is a fatal error.
*/
NGHTTP2_ERR_CALLBACK_FAILURE = -902,
/**
* Invalid client magic (see :macro:`NGHTTP2_CLIENT_MAGIC`) was
* received and further processing is not possible.
*/
NGHTTP2_ERR_BAD_CLIENT_MAGIC = -903,
/**
* Possible flooding by peer was detected in this HTTP/2 session.
* Flooding is measured by how many PING and SETTINGS frames with
* ACK flag set are queued for transmission. These frames are
* response for the peer initiated frames, and peer can cause memory
* exhaustion on server side to send these frames forever and does
* not read network.
*/
NGHTTP2_ERR_FLOODED = -904
} nghttp2_error;
/**
* @struct
*
* The object representing single contiguous buffer.
*/
typedef struct {
/**
* The pointer to the buffer.
*/
uint8_t *base;
/**
* The length of the buffer.
*/
size_t len;
} nghttp2_vec;
struct nghttp2_rcbuf;
/**
* @struct
*
* The object representing reference counted buffer. The details of
* this structure are intentionally hidden from the public API.
*/
typedef struct nghttp2_rcbuf nghttp2_rcbuf;
/**
* @function
*
* Increments the reference count of |rcbuf| by 1.
*/
NGHTTP2_EXTERN void nghttp2_rcbuf_incref(nghttp2_rcbuf *rcbuf);
/**
* @function
*
* 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.
*/
NGHTTP2_EXTERN void nghttp2_rcbuf_decref(nghttp2_rcbuf *rcbuf);
/**
* @function
*
* Returns the underlying buffer managed by |rcbuf|.
*/
NGHTTP2_EXTERN nghttp2_vec nghttp2_rcbuf_get_buf(nghttp2_rcbuf *rcbuf);
/**
* @enum
*
* The flags for header field name/value pair.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_NV_FLAG_NONE = 0,
/**
* Indicates that this name/value pair must not be indexed ("Literal
* Header Field never Indexed" representation must be used in HPACK
* encoding). Other implementation calls this bit as "sensitive".
*/
NGHTTP2_NV_FLAG_NO_INDEX = 0x01,
/**
* This flag 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.
*/
NGHTTP2_NV_FLAG_NO_COPY_NAME = 0x02,
/**
* This flag 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.
*/
NGHTTP2_NV_FLAG_NO_COPY_VALUE = 0x04
} nghttp2_nv_flag;
/**
* @struct
*
* The name/value pair, which mainly used to represent header fields.
*/
typedef struct {
/**
* The |name| byte string. If this struct is presented from library
* (e.g., :type:`nghttp2_on_frame_recv_callback`), |name| is
* guaranteed to be NULL-terminated. For some callbacks
* (:type:`nghttp2_before_frame_send_callback`,
* :type:`nghttp2_on_frame_send_callback`, and
* :type:`nghttp2_on_frame_not_send_callback`), it may not be
* NULL-terminated if header field is passed from application with
* the flag :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`).
* When application is constructing this struct, |name| is not
* required to be NULL-terminated.
*/
uint8_t *name;
/**
* The |value| byte string. If this struct is presented from
* library (e.g., :type:`nghttp2_on_frame_recv_callback`), |value|
* is guaranteed to be NULL-terminated. For some callbacks
* (:type:`nghttp2_before_frame_send_callback`,
* :type:`nghttp2_on_frame_send_callback`, and
* :type:`nghttp2_on_frame_not_send_callback`), it may not be
* NULL-terminated if header field is passed from application with
* the flag :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE`).
* When application is constructing this struct, |value| is not
* required to be NULL-terminated.
*/
uint8_t *value;
/**
* The length of the |name|, excluding terminating NULL.
*/
size_t namelen;
/**
* The length of the |value|, excluding terminating NULL.
*/
size_t valuelen;
/**
* Bitwise OR of one or more of :type:`nghttp2_nv_flag`.
*/
uint8_t flags;
} nghttp2_nv;
/**
* @enum
*
* The frame types in HTTP/2 specification.
*/
typedef enum {
/**
* The DATA frame.
*/
NGHTTP2_DATA = 0,
/**
* The HEADERS frame.
*/
NGHTTP2_HEADERS = 0x01,
/**
* The PRIORITY frame.
*/
NGHTTP2_PRIORITY = 0x02,
/**
* The RST_STREAM frame.
*/
NGHTTP2_RST_STREAM = 0x03,
/**
* The SETTINGS frame.
*/
NGHTTP2_SETTINGS = 0x04,
/**
* The PUSH_PROMISE frame.
*/
NGHTTP2_PUSH_PROMISE = 0x05,
/**
* The PING frame.
*/
NGHTTP2_PING = 0x06,
/**
* The GOAWAY frame.
*/
NGHTTP2_GOAWAY = 0x07,
/**
* The WINDOW_UPDATE frame.
*/
NGHTTP2_WINDOW_UPDATE = 0x08,
/**
* The CONTINUATION frame. This frame type won't be passed to any
* callbacks because the library processes this frame type and its
* preceding HEADERS/PUSH_PROMISE as a single frame.
*/
NGHTTP2_CONTINUATION = 0x09,
/**
* The ALTSVC frame, which is defined in `RFC 7383
* <https://tools.ietf.org/html/rfc7838#section-4>`_.
*/
NGHTTP2_ALTSVC = 0x0a,
/**
* The ORIGIN frame, which is defined by `RFC 8336
* <https://tools.ietf.org/html/rfc8336>`_.
*/
NGHTTP2_ORIGIN = 0x0c
} nghttp2_frame_type;
/**
* @enum
*
* The flags for HTTP/2 frames. This enum defines all flags for all
* frames.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_FLAG_NONE = 0,
/**
* The END_STREAM flag.
*/
NGHTTP2_FLAG_END_STREAM = 0x01,
/**
* The END_HEADERS flag.
*/
NGHTTP2_FLAG_END_HEADERS = 0x04,
/**
* The ACK flag.
*/
NGHTTP2_FLAG_ACK = 0x01,
/**
* The PADDED flag.
*/
NGHTTP2_FLAG_PADDED = 0x08,
/**
* The PRIORITY flag.
*/
NGHTTP2_FLAG_PRIORITY = 0x20
} nghttp2_flag;
/**
* @enum
* The SETTINGS ID.
*/
typedef enum {
/**
* SETTINGS_HEADER_TABLE_SIZE
*/
NGHTTP2_SETTINGS_HEADER_TABLE_SIZE = 0x01,
/**
* SETTINGS_ENABLE_PUSH
*/
NGHTTP2_SETTINGS_ENABLE_PUSH = 0x02,
/**
* SETTINGS_MAX_CONCURRENT_STREAMS
*/
NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS = 0x03,
/**
* SETTINGS_INITIAL_WINDOW_SIZE
*/
NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE = 0x04,
/**
* SETTINGS_MAX_FRAME_SIZE
*/
NGHTTP2_SETTINGS_MAX_FRAME_SIZE = 0x05,
/**
* SETTINGS_MAX_HEADER_LIST_SIZE
*/
NGHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE = 0x06,
/**
* SETTINGS_ENABLE_CONNECT_PROTOCOL
* (`RFC 8441 <https://tools.ietf.org/html/rfc8441>`_)
*/
NGHTTP2_SETTINGS_ENABLE_CONNECT_PROTOCOL = 0x08
} nghttp2_settings_id;
/* Note: If we add SETTINGS, update the capacity of
NGHTTP2_INBOUND_NUM_IV as well */
/**
* @macro
*
* .. warning::
*
* Deprecated. The initial max concurrent streams is 0xffffffffu.
*
* Default maximum number of incoming concurrent streams. Use
* `nghttp2_submit_settings()` with
* :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS`
* to change the maximum number of incoming concurrent streams.
*
* .. note::
*
* The maximum number of outgoing concurrent streams is 100 by
* default.
*/
#define NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
/**
* @enum
* The status codes for the RST_STREAM and GOAWAY frames.
*/
typedef enum {
/**
* No errors.
*/
NGHTTP2_NO_ERROR = 0x00,
/**
* PROTOCOL_ERROR
*/
NGHTTP2_PROTOCOL_ERROR = 0x01,
/**
* INTERNAL_ERROR
*/
NGHTTP2_INTERNAL_ERROR = 0x02,
/**
* FLOW_CONTROL_ERROR
*/
NGHTTP2_FLOW_CONTROL_ERROR = 0x03,
/**
* SETTINGS_TIMEOUT
*/
NGHTTP2_SETTINGS_TIMEOUT = 0x04,
/**
* STREAM_CLOSED
*/
NGHTTP2_STREAM_CLOSED = 0x05,
/**
* FRAME_SIZE_ERROR
*/
NGHTTP2_FRAME_SIZE_ERROR = 0x06,
/**
* REFUSED_STREAM
*/
NGHTTP2_REFUSED_STREAM = 0x07,
/**
* CANCEL
*/
NGHTTP2_CANCEL = 0x08,
/**
* COMPRESSION_ERROR
*/
NGHTTP2_COMPRESSION_ERROR = 0x09,
/**
* CONNECT_ERROR
*/
NGHTTP2_CONNECT_ERROR = 0x0a,
/**
* ENHANCE_YOUR_CALM
*/
NGHTTP2_ENHANCE_YOUR_CALM = 0x0b,
/**
* INADEQUATE_SECURITY
*/
NGHTTP2_INADEQUATE_SECURITY = 0x0c,
/**
* HTTP_1_1_REQUIRED
*/
NGHTTP2_HTTP_1_1_REQUIRED = 0x0d
} nghttp2_error_code;
/**
* @struct
* The frame header.
*/
typedef struct {
/**
* The length field of this frame, excluding frame header.
*/
size_t length;
/**
* The stream identifier (aka, stream ID)
*/
int32_t stream_id;
/**
* The type of this frame. See `nghttp2_frame_type`.
*/
uint8_t type;
/**
* The flags.
*/
uint8_t flags;
/**
* Reserved bit in frame header. Currently, this is always set to 0
* and application should not expect something useful in here.
*/
uint8_t reserved;
} nghttp2_frame_hd;
/**
* @union
*
* This union represents the some kind of data source passed to
* :type:`nghttp2_data_source_read_callback`.
*/
typedef union {
/**
* The integer field, suitable for a file descriptor.
*/
int fd;
/**
* The pointer to an arbitrary object.
*/
void *ptr;
} nghttp2_data_source;
/**
* @enum
*
* The flags used to set in |data_flags| output parameter in
* :type:`nghttp2_data_source_read_callback`.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_DATA_FLAG_NONE = 0,
/**
* Indicates EOF was sensed.
*/
NGHTTP2_DATA_FLAG_EOF = 0x01,
/**
* Indicates that END_STREAM flag must not be set even if
* NGHTTP2_DATA_FLAG_EOF is set. Usually this flag is used to send
* trailer fields with `nghttp2_submit_request()` or
* `nghttp2_submit_response()`.
*/
NGHTTP2_DATA_FLAG_NO_END_STREAM = 0x02,
/**
* Indicates that application will send complete DATA frame in
* :type:`nghttp2_send_data_callback`.
*/
NGHTTP2_DATA_FLAG_NO_COPY = 0x04
} nghttp2_data_flag;
/**
* @functypedef
*
* Custom memory allocator to replace malloc(). The |mem_user_data|
* is the mem_user_data member of :type:`nghttp2_mem` structure.
*/
typedef void *(*nghttp2_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:`nghttp2_mem` structure.
*/
typedef void (*nghttp2_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:`nghttp2_mem` structure.
*/
typedef void *(*nghttp2_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:`nghttp2_mem` structure.
*/
typedef void *(*nghttp2_realloc)(void *ptr, size_t size, void *mem_user_data);
typedef struct {
/**
* An arbitrary user supplied data. This is passed to each
* allocator function.
*/
void *mem_user_data;
/**
* Custom allocator function to replace malloc().
*/
nghttp2_malloc malloc;
/**
* Custom allocator function to replace free().
*/
nghttp2_free free;
/**
* Custom allocator function to replace calloc().
*/
nghttp2_calloc calloc;
/**
* Custom allocator function to replace realloc().
*/
nghttp2_realloc realloc;
} nghttp2_mem;
/**
* @struct
*
* The DATA frame. The received data is delivered via
* :type:`nghttp2_on_data_chunk_recv_callback`.
*/
typedef struct {
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
} nghttp2_data;
/**
* @enum
*
* The category of HEADERS, which indicates the role of the frame. In
* HTTP/2 spec, request, response, push response and other arbitrary
* headers (e.g., trailer fields) are all called just HEADERS. To
* give the application the role of incoming HEADERS frame, we define
* several categories.
*/
typedef enum {
/**
* The HEADERS frame is opening new stream, which is analogous to
* SYN_STREAM in SPDY.
*/
NGHTTP2_HCAT_REQUEST = 0,
/**
* The HEADERS frame is the first response headers, which is
* analogous to SYN_REPLY in SPDY.
*/
NGHTTP2_HCAT_RESPONSE = 1,
/**
* The HEADERS frame is the first headers sent against reserved
* stream.
*/
NGHTTP2_HCAT_PUSH_RESPONSE = 2,
/**
* The HEADERS frame which does not apply for the above categories,
* which is analogous to HEADERS in SPDY. If non-final response
* (e.g., status 1xx) is used, final response HEADERS frame will be
* categorized here.
*/
NGHTTP2_HCAT_HEADERS = 3
} nghttp2_headers_category;
/**
* @struct
*
* The structure to specify stream dependency.
*/
typedef struct {
/**
* The stream ID of the stream to depend on. Specifying 0 makes
* stream not depend any other stream.
*/
int32_t stream_id;
/**
* The weight of this dependency.
*/
int32_t weight;
/**
* nonzero means exclusive dependency
*/
uint8_t exclusive;
} nghttp2_priority_spec;
/**
* @struct
*
* The HEADERS frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
/**
* The priority specification
*/
nghttp2_priority_spec pri_spec;
/**
* The name/value pairs.
*/
nghttp2_nv *nva;
/**
* The number of name/value pairs in |nva|.
*/
size_t nvlen;
/**
* The category of this HEADERS frame.
*/
nghttp2_headers_category cat;
} nghttp2_headers;
/**
* @struct
*
* The PRIORITY frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The priority specification.
*/
nghttp2_priority_spec pri_spec;
} nghttp2_priority;
/**
* @struct
*
* The RST_STREAM frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The error code. See :type:`nghttp2_error_code`.
*/
uint32_t error_code;
} nghttp2_rst_stream;
/**
* @struct
*
* The SETTINGS ID/Value pair. It has the following members:
*/
typedef struct {
/**
* The SETTINGS ID. See :type:`nghttp2_settings_id`.
*/
int32_t settings_id;
/**
* The value of this entry.
*/
uint32_t value;
} nghttp2_settings_entry;
/**
* @struct
*
* The SETTINGS frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The number of SETTINGS ID/Value pairs in |iv|.
*/
size_t niv;
/**
* The pointer to the array of SETTINGS ID/Value pair.
*/
nghttp2_settings_entry *iv;
} nghttp2_settings;
/**
* @struct
*
* The PUSH_PROMISE frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
/**
* The name/value pairs.
*/
nghttp2_nv *nva;
/**
* The number of name/value pairs in |nva|.
*/
size_t nvlen;
/**
* The promised stream ID
*/
int32_t promised_stream_id;
/**
* Reserved bit. Currently this is always set to 0 and application
* should not expect something useful in here.
*/
uint8_t reserved;
} nghttp2_push_promise;
/**
* @struct
*
* The PING frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The opaque data
*/
uint8_t opaque_data[8];
} nghttp2_ping;
/**
* @struct
*
* The GOAWAY frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The last stream stream ID.
*/
int32_t last_stream_id;
/**
* The error code. See :type:`nghttp2_error_code`.
*/
uint32_t error_code;
/**
* The additional debug data
*/
uint8_t *opaque_data;
/**
* The length of |opaque_data| member.
*/
size_t opaque_data_len;
/**
* Reserved bit. Currently this is always set to 0 and application
* should not expect something useful in here.
*/
uint8_t reserved;
} nghttp2_goaway;
/**
* @struct
*
* The WINDOW_UPDATE frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The window size increment.
*/
int32_t window_size_increment;
/**
* Reserved bit. Currently this is always set to 0 and application
* should not expect something useful in here.
*/
uint8_t reserved;
} nghttp2_window_update;
/**
* @struct
*
* The extension frame. It has following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The pointer to extension payload. The exact pointer type is
* determined by hd.type.
*
* Currently, no extension is supported. This is a place holder for
* the future extensions.
*/
void *payload;
} nghttp2_extension;
/**
* @union
*
* This union includes all frames to pass them to various function
* calls as nghttp2_frame type. The CONTINUATION frame is omitted
* from here because the library deals with it internally.
*/
typedef union {
/**
* The frame header, which is convenient to inspect frame header.
*/
nghttp2_frame_hd hd;
/**
* The DATA frame.
*/
nghttp2_data data;
/**
* The HEADERS frame.
*/
nghttp2_headers headers;
/**
* The PRIORITY frame.
*/
nghttp2_priority priority;
/**
* The RST_STREAM frame.
*/
nghttp2_rst_stream rst_stream;
/**
* The SETTINGS frame.
*/
nghttp2_settings settings;
/**
* The PUSH_PROMISE frame.
*/
nghttp2_push_promise push_promise;
/**
* The PING frame.
*/
nghttp2_ping ping;
/**
* The GOAWAY frame.
*/
nghttp2_goaway goaway;
/**
* The WINDOW_UPDATE frame.
*/
nghttp2_window_update window_update;
/**
* The extension frame.
*/
nghttp2_extension ext;
} nghttp2_frame;
/* HPACK API */
struct nghttp2_hd_deflater;
/**
* @struct
*
* HPACK deflater object.
*/
typedef struct nghttp2_hd_deflater nghttp2_hd_deflater;
/**
* @function
*
* Initializes |*deflater_ptr| for deflating name/values pairs.
*
* The |max_deflate_dynamic_table_size| is the upper bound of header
* table size the deflater will use.
*
* If this function fails, |*deflater_ptr| is left untouched.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
NGHTTP2_EXTERN int
nghttp2_hd_deflate_new(nghttp2_hd_deflater **deflater_ptr,
size_t max_deflate_dynamic_table_size);
/**
* @function
*
* Like `nghttp2_hd_deflate_new()`, but with additional custom memory
* allocator specified in the |mem|.
*
* The |mem| can be ``NULL`` and the call is equivalent to
* `nghttp2_hd_deflate_new()`.
*
* This function does not take ownership |mem|. The application is
* responsible for freeing |mem|.
*
* The library code does not refer to |mem| pointer after this
* function returns, so the application can safely free it.
*/
NGHTTP2_EXTERN int
nghttp2_hd_deflate_new2(nghttp2_hd_deflater **deflater_ptr,
size_t max_deflate_dynamic_table_size,
nghttp2_mem *mem);
/**
* @function
*
* Deallocates any resources allocated for |deflater|.
*/
NGHTTP2_EXTERN void nghttp2_hd_deflate_del(nghttp2_hd_deflater *deflater);
/**
* @function
*
* Changes header table size of the |deflater| to
* |settings_max_dynamic_table_size| bytes. This may trigger eviction
* in the dynamic table.
*
* The |settings_max_dynamic_table_size| should be the value received
* in SETTINGS_HEADER_TABLE_SIZE.
*
* The deflater never uses more memory than
* ``max_deflate_dynamic_table_size`` bytes specified in
* `nghttp2_hd_deflate_new()`. Therefore, if
* |settings_max_dynamic_table_size| >
* ``max_deflate_dynamic_table_size``, resulting maximum table size
* becomes ``max_deflate_dynamic_table_size``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
NGHTTP2_EXTERN int
nghttp2_hd_deflate_change_table_size(nghttp2_hd_deflater *deflater,
size_t settings_max_dynamic_table_size);
/**
* @function
*
* Deflates the |nva|, which has the |nvlen| name/value pairs, into
* the |buf| of length |buflen|.
*
* If |buf| is not large enough to store the deflated header block,
* this function fails with
* :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller
* should use `nghttp2_hd_deflate_bound()` to know the upper bound of
* buffer size required to deflate given header name/value pairs.
*
* Once this function fails, subsequent call of this function always
* returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`.
*
* After this function returns, it is safe to delete the |nva|.
*
* This function returns the number of bytes written to |buf| if it
* succeeds, or one of the following negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`
* Deflation process has failed.
* :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`
* The provided |buflen| size is too small to hold the output.
*/
NGHTTP2_EXTERN ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater *deflater,
uint8_t *buf, size_t buflen,
const nghttp2_nv *nva,
size_t nvlen);
/**
* @function
*
* Deflates the |nva|, which has the |nvlen| name/value pairs, into
* the |veclen| size of buf vector |vec|. The each size of buffer
* must be set in len field of :type:`nghttp2_vec`. If and only if
* one chunk is filled up completely, next chunk will be used. If
* |vec| is not large enough to store the deflated header block, this
* function fails with
* :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller
* should use `nghttp2_hd_deflate_bound()` to know the upper bound of
* buffer size required to deflate given header name/value pairs.
*
* Once this function fails, subsequent call of this function always
* returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`.
*
* After this function returns, it is safe to delete the |nva|.
*
* This function returns the number of bytes written to |vec| if it
* succeeds, or one of the following negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`
* Deflation process has failed.
* :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`
* The provided |buflen| size is too small to hold the output.
*/
NGHTTP2_EXTERN ssize_t nghttp2_hd_deflate_hd_vec(nghttp2_hd_deflater *deflater,
const nghttp2_vec *vec,
size_t veclen,
const nghttp2_nv *nva,
size_t nvlen);
/**
* @function
*
* Returns an upper bound on the compressed size after deflation of
* |nva| of length |nvlen|.
*/
NGHTTP2_EXTERN size_t nghttp2_hd_deflate_bound(nghttp2_hd_deflater *deflater,
const nghttp2_nv *nva,
size_t nvlen);
/**
* @function
*
* Returns the number of entries that header table of |deflater|
* contains. This is the sum of the number of static table and
* dynamic table, so the return value is at least 61.
*/
NGHTTP2_EXTERN
size_t nghttp2_hd_deflate_get_num_table_entries(nghttp2_hd_deflater *deflater);
/**
* @function
*
* Returns the table entry denoted by |idx| from header table of
* |deflater|. The |idx| is 1-based, and idx=1 returns first entry of
* static table. idx=62 returns first entry of dynamic table if it
* exists. Specifying idx=0 is error, and this function returns NULL.
* If |idx| is strictly greater than the number of entries the tables
* contain, this function returns NULL.
*/
NGHTTP2_EXTERN
const nghttp2_nv *
nghttp2_hd_deflate_get_table_entry(nghttp2_hd_deflater *deflater, size_t idx);
/**
* @function
*
* Returns the used dynamic table size, including the overhead 32
* bytes per entry described in RFC 7541.
*/
NGHTTP2_EXTERN
size_t nghttp2_hd_deflate_get_dynamic_table_size(nghttp2_hd_deflater *deflater);
/**
* @function
*
* Returns the maximum dynamic table size.
*/
NGHTTP2_EXTERN
size_t
nghttp2_hd_deflate_get_max_dynamic_table_size(nghttp2_hd_deflater *deflater);
struct nghttp2_hd_inflater;
/**
* @struct
*
* HPACK inflater object.
*/
typedef struct nghttp2_hd_inflater nghttp2_hd_inflater;
/**
* @function
*
* Initializes |*inflater_ptr| for inflating name/values pairs.
*
* If this function fails, |*inflater_ptr| is left untouched.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
NGHTTP2_EXTERN int nghttp2_hd_inflate_new(nghttp2_hd_inflater **inflater_ptr);
/**
* @function
*
* Like `nghttp2_hd_inflate_new()`, but with additional custom memory
* allocator specified in the |mem|.
*
* The |mem| can be ``NULL`` and the call is equivalent to
* `nghttp2_hd_inflate_new()`.
*
* This function does not take ownership |mem|. The application is
* responsible for freeing |mem|.
*
* The library code does not refer to |mem| pointer after this
* function returns, so the application can safely free it.
*/
NGHTTP2_EXTERN int nghttp2_hd_inflate_new2(nghttp2_hd_inflater **inflater_ptr,
nghttp2_mem *mem);
/**
* @function
*
* Deallocates any resources allocated for |inflater|.
*/
NGHTTP2_EXTERN void nghttp2_hd_inflate_del(nghttp2_hd_inflater *inflater);
/**
* @function
*
* Changes header table size in the |inflater|. This may trigger
* eviction in the dynamic table.
*
* The |settings_max_dynamic_table_size| should be the value
* transmitted in SETTINGS_HEADER_TABLE_SIZE.
*
* This function must not be called while header block is being
* inflated. In other words, this function must be called after
* initialization of |inflater|, but before calling
* `nghttp2_hd_inflate_hd2()`, or after
* `nghttp2_hd_inflate_end_headers()`. Otherwise,
* `NGHTTP2_ERR_INVALID_STATE` was returned.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`
* The function is called while header block is being inflated.
* Probably, application missed to call
* `nghttp2_hd_inflate_end_headers()`.
*/
NGHTTP2_EXTERN int
nghttp2_hd_inflate_change_table_size(nghttp2_hd_inflater *inflater,
size_t settings_max_dynamic_table_size);
/**
* @enum
*
* The flags for header inflation.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_HD_INFLATE_NONE = 0,
/**
* Indicates all headers were inflated.
*/
NGHTTP2_HD_INFLATE_FINAL = 0x01,
/**
* Indicates a header was emitted.
*/
NGHTTP2_HD_INFLATE_EMIT = 0x02
} nghttp2_hd_inflate_flag;
/**
* @function
*
* .. warning::
*
* Deprecated. Use `nghttp2_hd_inflate_hd2()` instead.
*
* Inflates name/value block stored in |in| with length |inlen|. This
* function performs decompression. For each successful emission of
* header name/value pair,
* :enum:`nghttp2_hd_inflate_flag.NGHTTP2_HD_INFLATE_EMIT` is set in
* |*inflate_flags| and name/value pair is assigned to the |nv_out|
* and the function returns. The caller must not free the members of
* |nv_out|.
*
* The |nv_out| may include pointers to the memory region in the |in|.
* The caller must retain the |in| while the |nv_out| is used.
*
* The application should call this function repeatedly until the
* ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and
* return value is non-negative. This means the all input values are
* processed successfully. Then the application must call
* `nghttp2_hd_inflate_end_headers()` to prepare for the next header
* block input.
*
* The caller can feed complete compressed header block. It also can
* feed it in several chunks. The caller must set |in_final| to
* nonzero if the given input is the last block of the compressed
* header.
*
* This function returns the number of bytes processed if it succeeds,
* or one of the following negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`
* Inflation process has failed.
* :enum:`nghttp2_error.NGHTTP2_ERR_BUFFER_ERROR`
* The header field name or value is too large.
*
* Example follows::
*
* int inflate_header_block(nghttp2_hd_inflater *hd_inflater,
* uint8_t *in, size_t inlen, int final)
* {
* ssize_t rv;
*
* for(;;) {
* nghttp2_nv nv;
* int inflate_flags = 0;
*
* rv = nghttp2_hd_inflate_hd(hd_inflater, &nv, &inflate_flags,
* in, inlen, final);
*
* if(rv < 0) {
* fprintf(stderr, "inflate failed with error code %zd", rv);
* return -1;
* }
*
* in += rv;
* inlen -= rv;
*
* if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) {
* fwrite(nv.name, nv.namelen, 1, stderr);
* fprintf(stderr, ": ");
* fwrite(nv.value, nv.valuelen, 1, stderr);
* fprintf(stderr, "\n");
* }
* if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) {
* nghttp2_hd_inflate_end_headers(hd_inflater);
* break;
* }
* if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 &&
* inlen == 0) {
* break;
* }
* }
*
* return 0;
* }
*
*/
NGHTTP2_EXTERN ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out,
int *inflate_flags, uint8_t *in,
size_t inlen, int in_final);
/**
* @function
*
* Inflates name/value block stored in |in| with length |inlen|. This
* function performs decompression. For each successful emission of
* header name/value pair,
* :enum:`nghttp2_hd_inflate_flag.NGHTTP2_HD_INFLATE_EMIT` is set in
* |*inflate_flags| and name/value pair is assigned to the |nv_out|
* and the function returns. The caller must not free the members of
* |nv_out|.
*
* The |nv_out| may include pointers to the memory region in the |in|.
* The caller must retain the |in| while the |nv_out| is used.
*
* The application should call this function repeatedly until the
* ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and
* return value is non-negative. If that happens, all given input
* data (|inlen| bytes) are processed successfully. Then the
* application must call `nghttp2_hd_inflate_end_headers()` to prepare
* for the next header block input.
*
* In other words, if |in_final| is nonzero, and this function returns
* |inlen|, you can assert that
* :enum:`nghttp2_hd_inflate_final.NGHTTP2_HD_INFLATE_FINAL` is set in
* |*inflate_flags|.
*
* The caller can feed complete compressed header block. It also can
* feed it in several chunks. The caller must set |in_final| to
* nonzero if the given input is the last block of the compressed
* header.
*
* This function returns the number of bytes processed if it succeeds,
* or one of the following negative error codes:
*
* :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`
* Inflation process has failed.
* :enum:`nghttp2_error.NGHTTP2_ERR_BUFFER_ERROR`
* The header field name or value is too large.
*
* Example follows::
*
* int inflate_header_block(nghttp2_hd_inflater *hd_inflater,
* uint8_t *in, size_t inlen, int final)
* {
* ssize_t rv;
*
* for(;;) {
* nghttp2_nv nv;
* int inflate_flags = 0;
*
* rv = nghttp2_hd_inflate_hd2(hd_inflater, &nv, &inflate_flags,
* in, inlen, final);
*
* if(rv < 0) {
* fprintf(stderr, "inflate failed with error code %zd", rv);
* return -1;
* }
*
* in += rv;
* inlen -= rv;
*
* if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) {
* fwrite(nv.name, nv.namelen, 1, stderr);
* fprintf(stderr, ": ");
* fwrite(nv.value, nv.valuelen, 1, stderr);
* fprintf(stderr, "\n");
* }
* if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) {
* nghttp2_hd_inflate_end_headers(hd_inflater);
* break;
* }
* if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 &&
* inlen == 0) {
* break;
* }
* }
*
* return 0;
* }
*
*/
NGHTTP2_EXTERN ssize_t nghttp2_hd_inflate_hd2(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out,
int *inflate_flags,
const uint8_t *in, size_t inlen,
int in_final);
/**
* @function
*
* Signals the end of decompression for one header block.
*
* This function returns 0 if it succeeds. Currently this function
* always succeeds.
*/
NGHTTP2_EXTERN int
nghttp2_hd_inflate_end_headers(nghttp2_hd_inflater *inflater);
/**
* @function
*
* Returns the number of entries that header table of |inflater|
* contains. This is the sum of the number of static table and
* dynamic table, so the return value is at least 61.
*/
NGHTTP2_EXTERN
size_t nghttp2_hd_inflate_get_num_table_entries(nghttp2_hd_inflater *inflater);
/**
* @function
*
* Returns the table entry denoted by |idx| from header table of
* |inflater|. The |idx| is 1-based, and idx=1 returns first entry of
* static table. idx=62 returns first entry of dynamic table if it
* exists. Specifying idx=0 is error, and this function returns NULL.
* If |idx| is strictly greater than the number of entries the tables
* contain, this function returns NULL.
*/
NGHTTP2_EXTERN
const nghttp2_nv *
nghttp2_hd_inflate_get_table_entry(nghttp2_hd_inflater *inflater, size_t idx);
/**
* @function
*
* Returns the used dynamic table size, including the overhead 32
* bytes per entry described in RFC 7541.
*/
NGHTTP2_EXTERN
size_t nghttp2_hd_inflate_get_dynamic_table_size(nghttp2_hd_inflater *inflater);
/**
* @function
*
* Returns the maximum dynamic table size.
*/
NGHTTP2_EXTERN
size_t
nghttp2_hd_inflate_get_max_dynamic_table_size(nghttp2_hd_inflater *inflater);
/**
* @enum
*
* State of stream as described in RFC 7540.
*/
typedef enum {
/**
* idle state.
*/
NGHTTP2_STREAM_STATE_IDLE = 1,
/**
* open state.
*/
NGHTTP2_STREAM_STATE_OPEN,
/**
* reserved (local) state.
*/
NGHTTP2_STREAM_STATE_RESERVED_LOCAL,
/**
* reserved (remote) state.
*/
NGHTTP2_STREAM_STATE_RESERVED_REMOTE,
/**
* half closed (local) state.
*/
NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL,
/**
* half closed (remote) state.
*/
NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE,
/**
* closed state.
*/
NGHTTP2_STREAM_STATE_CLOSED
} nghttp2_stream_proto_state;
/**
* @functypedef
*
* 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 (*nghttp2_debug_vprintf_callback)(const char *format,
va_list args);
/**
* @function
*
* 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.
*
* Note that building with ``DEBUGBUILD`` may cause significant
* performance penalty to libnghttp2 because of extra processing. It
* should be used for debugging purpose only.
*
* .. Warning::
*
* Building with ``DEBUGBUILD`` may cause significant performance
* penalty to libnghttp2 because of extra processing. It should be
* used for debugging purpose only. We write this two times because
* this is important.
*/
NGHTTP2_EXTERN void nghttp2_set_debug_vprintf_callback(
nghttp2_debug_vprintf_callback debug_vprintf_callback);
#ifdef __cplusplus
}
#endif
#endif /* NGHTTP2_H */