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Unified Diff: net/spdy/spdy_protocol.h

Issue 9618002: SPDY - integration of spdy/3 code. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 8 years, 9 months ago
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Index: net/spdy/spdy_protocol.h
===================================================================
--- net/spdy/spdy_protocol.h (revision 126086)
+++ net/spdy/spdy_protocol.h (working copy)
@@ -141,17 +141,14 @@
// | 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";
@@ -162,6 +159,207 @@
// 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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+ 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.
@@ -172,7 +370,7 @@
SYN_REPLY,
RST_STREAM,
SETTINGS,
- NOOP,
+ NOOP, // Because it is valid in SPDY/2, kept for identifiability/enum order.
PING,
GOAWAY,
HEADERS,
@@ -239,7 +437,9 @@
// 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)
@@ -285,7 +485,6 @@
// A SYN_REPLY Control Frame structure.
struct SpdySynReplyControlFrameBlock : SpdyFrameBlock {
SpdyStreamId stream_id_;
- uint16 unused_;
};
// A RST_STREAM Control Frame structure.
@@ -300,15 +499,12 @@
// 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_;
@@ -326,7 +522,6 @@
// A HEADERS Control Frame structure.
struct SpdyHeadersControlFrameBlock : SpdyFrameBlock {
SpdyStreamId stream_id_;
- uint16 unused_;
};
// A WINDOW_UPDATE Control Frame structure
@@ -335,22 +530,6 @@
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)
// -------------------------------------------------------------------------
@@ -467,7 +646,10 @@
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 {
@@ -476,13 +658,15 @@
}
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);
}
@@ -497,15 +681,6 @@
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_;
@@ -540,7 +715,11 @@
}
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.
@@ -582,11 +761,21 @@
}
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.
@@ -680,15 +869,6 @@
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()) {}
@@ -776,11 +956,21 @@
// 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.
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