343 lines
11 KiB
C
343 lines
11 KiB
C
/*
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* Copyright (C) Nginx, Inc.
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* Copyright (C) Valentin V. Bartenev
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*/
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#ifndef _NGX_HTTP_V2_H_INCLUDED_
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#define _NGX_HTTP_V2_H_INCLUDED_
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#define NGX_HTTP_V2_ALPN_ADVERTISE "\x02h2"
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#define NGX_HTTP_V2_NPN_ADVERTISE NGX_HTTP_V2_ALPN_ADVERTISE
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#define NGX_HTTP_V2_STATE_BUFFER_SIZE 16
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#define NGX_HTTP_V2_MAX_FRAME_SIZE ((1 << 24) - 1)
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#define NGX_HTTP_V2_INT_OCTETS 4
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#define NGX_HTTP_V2_MAX_FIELD \
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(127 + (1 << (NGX_HTTP_V2_INT_OCTETS - 1) * 7) - 1)
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#define NGX_HTTP_V2_FRAME_HEADER_SIZE 9
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/* frame types */
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#define NGX_HTTP_V2_DATA_FRAME 0x0
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#define NGX_HTTP_V2_HEADERS_FRAME 0x1
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#define NGX_HTTP_V2_PRIORITY_FRAME 0x2
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#define NGX_HTTP_V2_RST_STREAM_FRAME 0x3
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#define NGX_HTTP_V2_SETTINGS_FRAME 0x4
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#define NGX_HTTP_V2_PUSH_PROMISE_FRAME 0x5
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#define NGX_HTTP_V2_PING_FRAME 0x6
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#define NGX_HTTP_V2_GOAWAY_FRAME 0x7
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#define NGX_HTTP_V2_WINDOW_UPDATE_FRAME 0x8
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#define NGX_HTTP_V2_CONTINUATION_FRAME 0x9
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/* frame flags */
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#define NGX_HTTP_V2_NO_FLAG 0x00
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#define NGX_HTTP_V2_ACK_FLAG 0x01
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#define NGX_HTTP_V2_END_STREAM_FLAG 0x01
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#define NGX_HTTP_V2_END_HEADERS_FLAG 0x04
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#define NGX_HTTP_V2_PADDED_FLAG 0x08
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#define NGX_HTTP_V2_PRIORITY_FLAG 0x20
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#define NGX_HTTP_V2_MAX_WINDOW ((1U << 31) - 1)
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#define NGX_HTTP_V2_DEFAULT_WINDOW 65535
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typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t;
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typedef struct ngx_http_v2_node_s ngx_http_v2_node_t;
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typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t;
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typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c,
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u_char *pos, u_char *end);
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typedef struct {
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ngx_str_t name;
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ngx_str_t value;
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} ngx_http_v2_header_t;
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typedef struct {
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ngx_uint_t sid;
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size_t length;
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size_t padding;
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unsigned flags:8;
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unsigned incomplete:1;
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unsigned keep_pool:1;
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/* HPACK */
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unsigned parse_name:1;
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unsigned parse_value:1;
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unsigned index:1;
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ngx_http_v2_header_t header;
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size_t header_limit;
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u_char field_state;
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u_char *field_start;
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u_char *field_end;
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size_t field_rest;
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ngx_pool_t *pool;
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ngx_http_v2_stream_t *stream;
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u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE];
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size_t buffer_used;
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ngx_http_v2_handler_pt handler;
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} ngx_http_v2_state_t;
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typedef struct {
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ngx_http_v2_header_t **entries;
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ngx_uint_t added;
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ngx_uint_t deleted;
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ngx_uint_t reused;
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ngx_uint_t allocated;
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size_t size;
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size_t free;
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u_char *storage;
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u_char *pos;
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} ngx_http_v2_hpack_t;
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struct ngx_http_v2_connection_s {
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ngx_connection_t *connection;
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ngx_http_connection_t *http_connection;
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ngx_uint_t processing;
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size_t send_window;
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size_t recv_window;
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size_t init_window;
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size_t frame_size;
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ngx_queue_t waiting;
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ngx_http_v2_state_t state;
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ngx_http_v2_hpack_t hpack;
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ngx_pool_t *pool;
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ngx_http_v2_out_frame_t *free_frames;
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ngx_connection_t *free_fake_connections;
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ngx_http_v2_node_t **streams_index;
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ngx_http_v2_out_frame_t *last_out;
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ngx_queue_t dependencies;
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ngx_queue_t closed;
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ngx_uint_t last_sid;
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unsigned closed_nodes:8;
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unsigned settings_ack:1;
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unsigned blocked:1;
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unsigned goaway:1;
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};
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struct ngx_http_v2_node_s {
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ngx_uint_t id;
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ngx_http_v2_node_t *index;
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ngx_http_v2_node_t *parent;
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ngx_queue_t queue;
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ngx_queue_t children;
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ngx_queue_t reuse;
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ngx_uint_t rank;
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ngx_uint_t weight;
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double rel_weight;
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ngx_http_v2_stream_t *stream;
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};
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struct ngx_http_v2_stream_s {
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ngx_http_request_t *request;
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ngx_http_v2_connection_t *connection;
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ngx_http_v2_node_t *node;
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ngx_uint_t queued;
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/*
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* A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the
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* send_window to become negative, hence it's signed.
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*/
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ssize_t send_window;
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size_t recv_window;
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ngx_buf_t *preread;
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ngx_http_v2_out_frame_t *free_frames;
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ngx_chain_t *free_frame_headers;
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ngx_chain_t *free_bufs;
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ngx_queue_t queue;
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ngx_array_t *cookies;
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size_t header_limit;
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ngx_pool_t *pool;
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unsigned waiting:1;
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unsigned blocked:1;
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unsigned exhausted:1;
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unsigned in_closed:1;
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unsigned out_closed:1;
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unsigned rst_sent:1;
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unsigned no_flow_control:1;
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unsigned skip_data:1;
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};
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struct ngx_http_v2_out_frame_s {
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ngx_http_v2_out_frame_t *next;
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ngx_chain_t *first;
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ngx_chain_t *last;
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ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c,
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ngx_http_v2_out_frame_t *frame);
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ngx_http_v2_stream_t *stream;
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size_t length;
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unsigned blocked:1;
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unsigned fin:1;
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};
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static ngx_inline void
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ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c,
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ngx_http_v2_out_frame_t *frame)
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{
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ngx_http_v2_out_frame_t **out;
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for (out = &h2c->last_out; *out; out = &(*out)->next) {
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if ((*out)->blocked || (*out)->stream == NULL) {
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break;
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}
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if ((*out)->stream->node->rank < frame->stream->node->rank
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|| ((*out)->stream->node->rank == frame->stream->node->rank
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&& (*out)->stream->node->rel_weight
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>= frame->stream->node->rel_weight))
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{
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break;
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}
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}
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frame->next = *out;
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*out = frame;
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}
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static ngx_inline void
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ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c,
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ngx_http_v2_out_frame_t *frame)
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{
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ngx_http_v2_out_frame_t **out;
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for (out = &h2c->last_out; *out; out = &(*out)->next)
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{
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if ((*out)->blocked || (*out)->stream == NULL) {
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break;
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}
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}
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frame->next = *out;
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*out = frame;
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}
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void ngx_http_v2_init(ngx_event_t *rev);
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void ngx_http_v2_request_headers_init(void);
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ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r,
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ngx_http_client_body_handler_pt post_handler);
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ngx_int_t ngx_http_v2_read_unbuffered_request_body(ngx_http_request_t *r);
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void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc);
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ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c);
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ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c,
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ngx_uint_t index, ngx_uint_t name_only);
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ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c,
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ngx_http_v2_header_t *header);
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ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size);
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ngx_int_t ngx_http_v2_huff_decode(u_char *state, u_char *src, size_t len,
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u_char **dst, ngx_uint_t last, ngx_log_t *log);
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size_t ngx_http_v2_huff_encode(u_char *src, size_t len, u_char *dst,
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ngx_uint_t lower);
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#define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1)
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#if (NGX_HAVE_NONALIGNED)
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#define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p))
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#define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p))
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#else
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#define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1])
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#define ngx_http_v2_parse_uint32(p) \
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((p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3])
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#endif
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#define ngx_http_v2_parse_length(p) ((p) >> 8)
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#define ngx_http_v2_parse_type(p) ((p) & 0xff)
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#define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff)
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#define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff)
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#define ngx_http_v2_write_uint16_aligned(p, s) \
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(*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
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#define ngx_http_v2_write_uint32_aligned(p, s) \
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(*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))
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#if (NGX_HAVE_NONALIGNED)
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#define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned
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#define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned
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#else
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#define ngx_http_v2_write_uint16(p, s) \
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((p)[0] = (u_char) ((s) >> 8), \
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(p)[1] = (u_char) (s), \
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(p) + sizeof(uint16_t))
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#define ngx_http_v2_write_uint32(p, s) \
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((p)[0] = (u_char) ((s) >> 24), \
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(p)[1] = (u_char) ((s) >> 16), \
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(p)[2] = (u_char) ((s) >> 8), \
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(p)[3] = (u_char) (s), \
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(p) + sizeof(uint32_t))
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#endif
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#define ngx_http_v2_write_len_and_type(p, l, t) \
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ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t))
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#define ngx_http_v2_write_sid ngx_http_v2_write_uint32
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#endif /* _NGX_HTTP_V2_H_INCLUDED_ */
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