text: /*
    +----------------------------------------------------------------------+
    | Swoole                                                               |
    +----------------------------------------------------------------------+
    | This source file is subject to version 2.0 of the Apache license,    |
    | that is bundled with this package in the file LICENSE, and is        |
    | available through the world-wide-web at the following url:           |
    | http://www.apache.org/licenses/LICENSE-2.0.html                      |
    | If you did not receive a copy of the Apache2.0 license and are unable|
    | to obtain it through the world-wide-web, please send a note to       |
    | license@php.net so we can mail you a copy immediately.               |
    +----------------------------------------------------------------------+
    | Author: Tianfeng Han  <mikan.tenny@gmail.com>                        |
    |         Twosee  <twose@qq.com>                                       |
    +----------------------------------------------------------------------+
  */
  
  #pragma once
  
  #define SW_HTTP2_PRI_STRING "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
  
  enum swHttp2ErrorCode {
      SW_HTTP2_ERROR_NO_ERROR = 0,
      SW_HTTP2_ERROR_PROTOCOL_ERROR = 1,
      SW_HTTP2_ERROR_INTERNAL_ERROR = 2,
      SW_HTTP2_ERROR_FLOW_CONTROL_ERROR = 3,
      SW_HTTP2_ERROR_SETTINGS_TIMEOUT = 4,
      SW_HTTP2_ERROR_STREAM_CLOSED = 5,
      SW_HTTP2_ERROR_FRAME_SIZE_ERROR = 6,
      SW_HTTP2_ERROR_REFUSED_STREAM = 7,
      SW_HTTP2_ERROR_CANCEL = 8,
      SW_HTTP2_ERROR_COMPRESSION_ERROR = 9,
      SW_HTTP2_ERROR_CONNECT_ERROR = 10,
      SW_HTTP2_ERROR_ENHANCE_YOUR_CALM = 11,
      SW_HTTP2_ERROR_INADEQUATE_SECURITY = 12,
  };
  
  enum swHttp2FrameType {
      SW_HTTP2_TYPE_DATA = 0,
      SW_HTTP2_TYPE_HEADERS = 1,
      SW_HTTP2_TYPE_PRIORITY = 2,
      SW_HTTP2_TYPE_RST_STREAM = 3,
      SW_HTTP2_TYPE_SETTINGS = 4,
      SW_HTTP2_TYPE_PUSH_PROMISE = 5,
      SW_HTTP2_TYPE_PING = 6,
      SW_HTTP2_TYPE_GOAWAY = 7,
      SW_HTTP2_TYPE_WINDOW_UPDATE = 8,
      SW_HTTP2_TYPE_CONTINUATION = 9,
  };
  
  enum swHttp2FrameFlag {
      SW_HTTP2_FLAG_NONE = 0x00,
      SW_HTTP2_FLAG_ACK = 0x01,
      SW_HTTP2_FLAG_END_STREAM = 0x01,
      SW_HTTP2_FLAG_END_HEADERS = 0x04,
      SW_HTTP2_FLAG_PADDED = 0x08,
      SW_HTTP2_FLAG_PRIORITY = 0x20,
  };
  
  enum swHttp2SettingId {
      SW_HTTP2_SETTING_HEADER_TABLE_SIZE = 0x1,
      SW_HTTP2_SETTINGS_ENABLE_PUSH = 0x2,
      SW_HTTP2_SETTINGS_MAX_CONCURRENT_STREAMS = 0x3,
      SW_HTTP2_SETTINGS_INIT_WINDOW_SIZE = 0x4,
      SW_HTTP2_SETTINGS_MAX_FRAME_SIZE = 0x5,
      SW_HTTP2_SETTINGS_MAX_HEADER_LIST_SIZE = 0x6,
  };
  
  enum swHttp2StreamFlag {
      SW_HTTP2_STREAM_NORMAL = 0,
      SW_HTTP2_STREAM_REQUEST_END = 1 << 0,
      SW_HTTP2_STREAM_PIPELINE_REQUEST = 1 << 1,
      SW_HTTP2_STREAM_PIPELINE_RESPONSE = 1 << 2,
      SW_HTTP2_STREAM_USE_PIPELINE_READ = 1 << 3,
  };
  
  #define SW_HTTP2_FRAME_HEADER_SIZE 9
  #define SW_HTTP2_SETTING_OPTION_SIZE 6
  #define SW_HTTP2_FRAME_PING_PAYLOAD_SIZE 8
  
  #define SW_HTTP2_RST_STREAM_SIZE 4
  #define SW_HTTP2_PRIORITY_SIZE 5
  #define SW_HTTP2_PING_SIZE 8
  #define SW_HTTP2_RST_STREAM_SIZE 4
  #define SW_HTTP2_GOAWAY_SIZE 8
  #define SW_HTTP2_WINDOW_UPDATE_SIZE 4
  #define SW_HTTP2_STREAM_ID_SIZE 4
  #define SW_HTTP2_SETTINGS_PARAM_SIZE 6
  
  #define swoole_http2_frame_trace_log(_trace_fn, _trace_str, ...)                                                       \
      swoole_trace_log(SW_TRACE_HTTP2,                                                                                   \
                       "%s [" SW_ECHO_GREEN "] frame"                                                                    \
                       "<length=%jd, flags=(%s), stream_id=%d> " _trace_str,                                             \
                       #_trace_fn,                                                                                       \
                       swoole::http2::get_type(type),                                                                    \
                       length,                                                                                           \
                       swoole::http2::get_flag_string(flags).c_str(),                                                    \
                       stream_id,                                                                                        \
                       ##__VA_ARGS__)
  
  namespace swoole {
  namespace http2 {
  
  struct Settings {
      uint32_t header_table_size;
      uint32_t window_size;
      uint32_t max_concurrent_streams;
      uint32_t max_frame_size;
      uint32_t max_header_list_size;
  };
  
  /**
   +-----------------------------------------------+
   |                 Length (24)                   |
   +---------------+---------------+---------------+
   |   Type (8)    |   Flags (8)   |
   +-+-------------+---------------+-------------------------------+
   |R|                 Stream Identifier (31)                      |
   +=+=============================================================+
   |                   Frame Payload (0...)                      ...
   +---------------------------------------------------------------+
   */
  struct Frame {
      uint32_t length : 24;
      uint32_t type : 8;
      uint32_t flags : 8;
      uint32_t rsv1 : 1;
      uint32_t identifier : 31;
      char data[0];
  };
  
  static sw_inline ssize_t get_length(const char *buf) {
      return (((uint8_t) buf[0]) << 16) + (((uint8_t) buf[1]) << 8) + (uint8_t) buf[2];
  }
  
  ssize_t get_frame_length(Protocol *protocol, network::Socket *conn, const char *buf, uint32_t length);
  int send_setting_frame(Protocol *protocol, network::Socket *conn);
  const char *get_type(int type);
  int get_type_color(int type);
  
  static sw_inline void init_settings(Settings *settings) {
      settings->header_table_size = SW_HTTP2_DEFAULT_HEADER_TABLE_SIZE;
      settings->window_size = SW_HTTP2_DEFAULT_WINDOW_SIZE;
      settings->max_concurrent_streams = SW_HTTP2_MAX_MAX_CONCURRENT_STREAMS;
      settings->max_frame_size = SW_HTTP2_MAX_MAX_FRAME_SIZE;
      settings->max_header_list_size = SW_HTTP2_DEFAULT_MAX_HEADER_LIST_SIZE;
  }
  
  static inline const std::string get_flag_string(int __flags) {
      std::string str;
      if (__flags & SW_HTTP2_FLAG_ACK) {
          str.append("ACK|");
      }
      if (__flags & SW_HTTP2_FLAG_END_STREAM) {
          str.append("END_STREAM|");
      }
      if (__flags & SW_HTTP2_FLAG_END_HEADERS) {
          str.append("END_HEADERS|");
      }
      if (__flags & SW_HTTP2_FLAG_PADDED) {
          str.append("PADDED|");
      }
      if (__flags & SW_HTTP2_FLAG_PRIORITY) {
          str.append("PRIORITY|");
      }
      if (str.back() == '|') {
          return str.substr(0, str.length() - 1);
      } else {
          return "none";
      }
  }
  
  /**
   +-----------------------------------------------+
   |                 Length (24)                   |
   +---------------+---------------+---------------+
   |   Type (8)    |   Flags (8)   |
   +-+-------------+---------------+-------------------------------+
   |R|                 Stream Identifier (31)                      |
   +=+=============================================================+
   |                   Frame Payload (0...)                      ...
   +---------------------------------------------------------------+
   */
  static sw_inline void set_frame_header(char *buffer, uint8_t type, uint32_t length, uint8_t flags, uint32_t stream_id) {
      buffer[0] = length >> 16;
      buffer[1] = length >> 8;
      buffer[2] = length;
      buffer[3] = type;
      buffer[4] = flags;
      *(uint32_t *) (buffer + 5) = htonl(stream_id);
  }
  
  }  // namespace http2
  }  // namespace swoole
  