SPDY - integration of spdy/3 code.

net/spdy/spdy_protocol.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains some protocol structures for use with Spdy.
 
 #ifndef NET_SPDY_SPDY_PROTOCOL_H_
 #define NET_SPDY_SPDY_PROTOCOL_H_
 #pragma once
 
@@ skipping 123 matching lines @@
 //  +-----------------+                |
 //  |      Proof Length (32 bits)      |
 //  +----------------------------------+
 //  |               Proof              |
 //  +----------------------------------+ <+
 //  |   Certificate Length (32 bits)   |  |
 //  +----------------------------------+  | Repeated until end of frame
 //  |            Certificate           |  |
 //  +----------------------------------+ <+
 //
+
 namespace spdy {
 
-// This implementation of Spdy is version 2; It's like version 1, with some
-// minor tweaks.
-const int kSpdyProtocolVersion = 2;
-
 // Initial window size for a Spdy stream
-const size_t kSpdyStreamInitialWindowSize = 64 * 1024;  // 64 KBytes
+const int32 kSpdyStreamInitialWindowSize = 64 * 1024;  // 64 KBytes
 
 // Maximum window size for a Spdy stream
-const size_t kSpdyStreamMaximumWindowSize = 0x7FFFFFFF;  // Max signed 32bit int
+const int32 kSpdyStreamMaximumWindowSize = 0x7FFFFFFF;  // Max signed 32bit int
 
 // HTTP-over-SPDY header constants
 const char kMethod[] = "method";
 const char kStatus[] = "status";
 const char kUrl[] = "url";
 const char kVersion[] = "version";
 // When we server push, we will add [path: fully/qualified/url] to the server
 // push headers so that the client will know what url the data corresponds to.
 const char kPath[] = "path";
 
+// SPDY 2 dictionary.
+// This is just a hacked dictionary to use for shrinking HTTP-like headers.
+const char kV2Dictionary[] =
+  "optionsgetheadpostputdeletetraceacceptaccept-charsetaccept-encodingaccept-"
+  "languageauthorizationexpectfromhostif-modified-sinceif-matchif-none-matchi"
+  "f-rangeif-unmodifiedsincemax-forwardsproxy-authorizationrangerefererteuser"
+  "-agent10010120020120220320420520630030130230330430530630740040140240340440"
+  "5406407408409410411412413414415416417500501502503504505accept-rangesageeta"
+  "glocationproxy-authenticatepublicretry-afterservervarywarningwww-authentic"
+  "ateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertran"
+  "sfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locati"
+  "oncontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMo"
+  "ndayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSe"
+  "pOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplic"
+  "ation/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1"
+  ".1statusversionurl";
+const int kV2DictionarySize = arraysize(kV2Dictionary);
+
+// SPDY 3 dictionary.
+const char kV3Dictionary[] = {
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+  0x2f, 0x6a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72,  // .javascr
+  0x69, 0x70, 0x74, 0x2c, 0x70, 0x75, 0x62, 0x6c,  // ipt.publ
+  0x69, 0x63, 0x70, 0x72, 0x69, 0x76, 0x61, 0x74,  // icprivat
+  0x65, 0x6d, 0x61, 0x78, 0x2d, 0x61, 0x67, 0x65,  // emax-age
+  0x3d, 0x67, 0x7a, 0x69, 0x70, 0x2c, 0x64, 0x65,  // .gzip.de
+  0x66, 0x6c, 0x61, 0x74, 0x65, 0x2c, 0x73, 0x64,  // flate.sd
+  0x63, 0x68, 0x63, 0x68, 0x61, 0x72, 0x73, 0x65,  // chcharse
+  0x74, 0x3d, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x63,  // t.utf-8c
+  0x68, 0x61, 0x72, 0x73, 0x65, 0x74, 0x3d, 0x69,  // harset.i
+  0x73, 0x6f, 0x2d, 0x38, 0x38, 0x35, 0x39, 0x2d,  // so-8859-
+  0x31, 0x2c, 0x75, 0x74, 0x66, 0x2d, 0x2c, 0x2a,  // 1.utf-..
+  0x2c, 0x65, 0x6e, 0x71, 0x3d, 0x30, 0x2e         // .enq.0.
+};
+const int kV3DictionarySize = arraysize(kV3Dictionary);
+
 // Note: all protocol data structures are on-the-wire format.  That means that
 //       data is stored in network-normalized order.  Readers must use the
 //       accessors provided or call ntohX() functions.
 
 // Types of Spdy Control Frames.
 enum SpdyControlType {
   SYN_STREAM = 1,
   SYN_REPLY,
   RST_STREAM,
   SETTINGS,
-  NOOP,
+  NOOP,  // Because it is valid in SPDY/2, kept for identifiability/enum order.
   PING,
   GOAWAY,
   HEADERS,
   WINDOW_UPDATE,
   CREDENTIAL,
   NUM_CONTROL_FRAME_TYPES
 };
 
 // Flags on data packets.
 enum SpdyDataFlags {
@@ skipping 46 matching lines @@
   CANCEL = 5,
   INTERNAL_ERROR = 6,
   FLOW_CONTROL_ERROR = 7,
   INVALID_ASSOCIATED_STREAM = 8,
   NUM_STATUS_CODES = 9
 };
 
 // A SPDY stream id is a 31 bit entity.
 typedef uint32 SpdyStreamId;
 
-// A SPDY priority is a number between 0 and 3 (inclusive).
+// A SPDY priority is a number between 0 and 7 (inclusive).
+// SPDY priority range is version-dependant. For SPDY 2 and below, priority is a
+// number between 0 and 3.
 typedef uint8 SpdyPriority;
 
 // SPDY Priorities. (there are only 2 bits)
 #define SPDY_PRIORITY_LOWEST 3
 #define SPDY_PRIORITY_HIGHEST 0
 
 // -------------------------------------------------------------------------
 // These structures mirror the protocol structure definitions.
 
 // For the control data structures, we pack so that sizes match the
@@ skipping 25 matching lines @@
 struct SpdySynStreamControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId stream_id_;
   SpdyStreamId associated_stream_id_;
   SpdyPriority priority_;
   uint8 unused_;
 };
 
 // A SYN_REPLY Control Frame structure.
 struct SpdySynReplyControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId stream_id_;
-  uint16 unused_;
 };
 
 // A RST_STREAM Control Frame structure.
 struct SpdyRstStreamControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId stream_id_;
   uint32 status_;
 };
 
 // A SETTINGS Control Frame structure.
 struct SpdySettingsControlFrameBlock : SpdyFrameBlock {
   uint32 num_entries_;
   // Variable data here.
 };
 
-// A NOOP Control Frame structure.
-struct SpdyNoopControlFrameBlock : SpdyFrameBlock {
-};
-
 // A PING Control Frame structure.
 struct SpdyPingControlFrameBlock : SpdyFrameBlock {
   uint32 unique_id_;
 };
 
+// TODO(avd): remove this struct
 // A CREDENTIAL Control Frame structure.
 struct SpdyCredentialControlFrameBlock : SpdyFrameBlock {
   uint16 slot_;
   uint32 proof_len_;
   // Variable data here.
   // proof data
   // for each certificate: unit32 certificate_len + certificate_data[i]
 };
 
 // A GOAWAY Control Frame structure.
 struct SpdyGoAwayControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId last_accepted_stream_id_;
 };
 
 // A HEADERS Control Frame structure.
 struct SpdyHeadersControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId stream_id_;
-  uint16 unused_;
 };
 
 // A WINDOW_UPDATE Control Frame structure
 struct SpdyWindowUpdateControlFrameBlock : SpdyFrameBlock {
   SpdyStreamId stream_id_;
   uint32 delta_window_size_;
 };
 
-// A structure for the 8 bit flags and 24 bit ID fields.
-union SettingsFlagsAndId {
-  // Sets both flags and id to the value for flags-and-id as sent over the wire
-  SettingsFlagsAndId(uint32 val) : id_(val) {}
-  uint8 flags() const { return flags_[0]; }
-  void set_flags(uint8 flags) { flags_[0] = flags; }
-  uint32 id() const { return (ntohl(id_) & kSettingsIdMask); }
-  void set_id(uint32 id) {
-    DCHECK_EQ(0u, (id & ~kSettingsIdMask));
-    id_ = htonl((flags() << 24) | (id & kSettingsIdMask));
-  }
-
-  uint8 flags_[4];  // 8 bits
-  uint32 id_;       // 24 bits
-};
-
 #pragma pack(pop)
 
 // -------------------------------------------------------------------------
 // Wrapper classes for various SPDY frames.
 
 // All Spdy Frame types derive from this SpdyFrame class.
 class SpdyFrame {
  public:
   // Create a SpdyFrame for a given sized buffer.
   explicit SpdyFrame(size_t size) : frame_(NULL), owns_buffer_(true) {
@@ skipping 96 matching lines @@
  public:
   explicit SpdyControlFrame(size_t size) : SpdyFrame(size) {}
   SpdyControlFrame(char* data, bool owns_buffer)
       : SpdyFrame(data, owns_buffer) {}
 
   // Callers can use this method to check if the frame appears to be a valid
   // frame.  Does not guarantee that there are no errors.
   bool AppearsToBeAValidControlFrame() const {
     // Right now we only check if the frame has an out-of-bounds type.
     uint16 type = ntohs(block()->control_.type_);
-    return (type >= SYN_STREAM && type < NUM_CONTROL_FRAME_TYPES);
+    // NOOP is not a 'valid' control frame in SPDY/3 and beyond.
+    return type >= SYN_STREAM &&
+        type < NUM_CONTROL_FRAME_TYPES &&
+        (version() == 2 || type != NOOP);
   }
 
   uint16 version() const {
     const int kVersionMask = 0x7fff;
     return ntohs(block()->control_.version_) & kVersionMask;
   }
 
   void set_version(uint16 version) {
-    DCHECK_EQ(0u, version & kControlFlagMask);
-    mutable_block()->control_.version_ = htons(kControlFlagMask | version);
+    const uint16 kControlBit = 0x80;
+    DCHECK_EQ(0, version & kControlBit);
+    mutable_block()->control_.version_ = kControlBit | htons(version);
   }
 
   SpdyControlType type() const {
     uint16 type = ntohs(block()->control_.type_);
-    DCHECK(type >= SYN_STREAM && type < NUM_CONTROL_FRAME_TYPES);
+    LOG_IF(DFATAL, type < SYN_STREAM || type >= NUM_CONTROL_FRAME_TYPES)
+        << "Invalid control frame type " << type;
     return static_cast<SpdyControlType>(type);
   }
 
   void set_type(SpdyControlType type) {
     DCHECK(type >= SYN_STREAM && type < NUM_CONTROL_FRAME_TYPES);
     mutable_block()->control_.type_ = htons(type);
   }
 
   // Returns true if this control frame is of a type that has a header block,
   // otherwise it returns false.
   bool has_header_block() const {
     return type() == SYN_STREAM || type() == SYN_REPLY || type() == HEADERS;
   }
 
-  // The size of the 'Number of Name/Value pairs' field in a Name/Value block.
-  static const size_t kNumNameValuePairsSize = 2;
-
-  // The size of the 'Length of a name' field in a Name/Value block.
-  static const size_t kLengthOfNameSize = 2;
-
-  // The size of the 'Length of a value' field in a Name/Value block.
-  static const size_t kLengthOfValueSize = 2;
-
  private:
   const struct SpdyFrameBlock* block() const {
     return frame_;
   }
   struct SpdyFrameBlock* mutable_block() {
     return frame_;
   }
   DISALLOW_COPY_AND_ASSIGN(SpdyControlFrame);
 };
 
@@ skipping 14 matching lines @@
 
   SpdyStreamId associated_stream_id() const {
     return ntohl(block()->associated_stream_id_) & kStreamIdMask;
   }
 
   void set_associated_stream_id(SpdyStreamId id) {
     mutable_block()->associated_stream_id_ = htonl(id & kStreamIdMask);
   }
 
   SpdyPriority priority() const {
-    return (block()->priority_ & kPriorityMask) >> 6;
+    if (version() < 3) {
+      return (block()->priority_ & kSpdy2PriorityMask) >> 6;
+    } else {
+      return (block()->priority_ & kSpdy3PriorityMask) >> 5;
+    }
   }
 
   // The number of bytes in the header block beyond the frame header length.
   int header_block_len() const {
     return length() - (size() - SpdyFrame::kHeaderSize);
   }
 
   const char* header_block() const {
     return reinterpret_cast<const char*>(block()) + size();
   }
@@ skipping 21 matching lines @@
 
   SpdyStreamId stream_id() const {
     return ntohl(block()->stream_id_) & kStreamIdMask;
   }
 
   void set_stream_id(SpdyStreamId id) {
     mutable_block()->stream_id_ = htonl(id & kStreamIdMask);
   }
 
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::kHeaderSize);
+    size_t header_block_len = length() - (size() - SpdyFrame::kHeaderSize);
+    // SPDY 2 had 2 bytes of unused space preceeding the header block.
+    if (version() < 3) {
+      header_block_len -= 2;
+    }
+    return header_block_len;
   }
 
   const char* header_block() const {
-    return reinterpret_cast<const char*>(block()) + size();
+    const char* header_block = reinterpret_cast<const char*>(block()) + size();
+    // SPDY 2 had 2 bytes of unused space preceeding the header block.
+    if (version() < 3) {
+      header_block += 2;
+    }
+    return header_block;
   }
 
   // Returns the size of the SpdySynReplyControlFrameBlock structure.
   // Note: this is not the size of the SpdySynReplyControlFrame class.
   static size_t size() { return sizeof(SpdySynReplyControlFrameBlock); }
 
  private:
   const struct SpdySynReplyControlFrameBlock* block() const {
     return static_cast<SpdySynReplyControlFrameBlock*>(frame_);
   }
@@ skipping 73 matching lines @@
  private:
   const struct SpdySettingsControlFrameBlock* block() const {
     return static_cast<SpdySettingsControlFrameBlock*>(frame_);
   }
   struct SpdySettingsControlFrameBlock* mutable_block() {
     return static_cast<SpdySettingsControlFrameBlock*>(frame_);
   }
   DISALLOW_COPY_AND_ASSIGN(SpdySettingsControlFrame);
 };
 
-class SpdyNoOpControlFrame : public SpdyControlFrame {
- public:
-  SpdyNoOpControlFrame() : SpdyControlFrame(size()) {}
-  SpdyNoOpControlFrame(char* data, bool owns_buffer)
-      : SpdyControlFrame(data, owns_buffer) {}
-
-  static size_t size() { return sizeof(SpdyNoopControlFrameBlock); }
-};
-
 class SpdyPingControlFrame : public SpdyControlFrame {
  public:
   SpdyPingControlFrame() : SpdyControlFrame(size()) {}
   SpdyPingControlFrame(char* data, bool owns_buffer)
       : SpdyControlFrame(data, owns_buffer) {}
 
   uint32 unique_id() const {
     return ntohl(block()->unique_id_);
   }
 
@@ skipping 67 matching lines @@
   SpdyStreamId stream_id() const {
     return ntohl(block()->stream_id_) & kStreamIdMask;
   }
 
   void set_stream_id(SpdyStreamId id) {
     mutable_block()->stream_id_ = htonl(id & kStreamIdMask);
   }
 
   // The number of bytes in the header block beyond the frame header length.
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::kHeaderSize);
+    size_t header_block_len = length() - (size() - SpdyFrame::kHeaderSize);
+    // SPDY 2 had 2 bytes of unused space preceeding the header block.
+    if (version() < 3) {
+      header_block_len -= 2;
+    }
+    return header_block_len;
   }
 
   const char* header_block() const {
-    return reinterpret_cast<const char*>(block()) + size();
+    const char* header_block = reinterpret_cast<const char*>(block()) + size();
+    // SPDY 2 had 2 bytes of unused space preceeding the header block.
+    if (version() < 3) {
+      header_block += 2;
+    }
+    return header_block;
   }
 
   // Returns the size of the SpdyHeadersControlFrameBlock structure.
   // Note: this is not the size of the SpdyHeadersControlFrame class.
   static size_t size() { return sizeof(SpdyHeadersControlFrameBlock); }
 
  private:
   const struct SpdyHeadersControlFrameBlock* block() const {
     return static_cast<SpdyHeadersControlFrameBlock*>(frame_);
   }
@@ skipping 37 matching lines @@
   struct SpdyWindowUpdateControlFrameBlock* mutable_block() {
     return static_cast<SpdyWindowUpdateControlFrameBlock*>(frame_);
   }
 
   DISALLOW_COPY_AND_ASSIGN(SpdyWindowUpdateControlFrame);
 };
 
 }  // namespace spdy
 
 #endif  // NET_SPDY_SPDY_PROTOCOL_H_