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Unified Diff: net/quic/quic_data_writer.h

Issue 11125002: Add QuicFramer and friends. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: narrowing in Created 8 years, 2 months ago
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Index: net/quic/quic_data_writer.h
diff --git a/net/quic/quic_data_writer.h b/net/quic/quic_data_writer.h
new file mode 100644
index 0000000000000000000000000000000000000000..57ef79bf7db30a97320be8a6990201d461372dc5
--- /dev/null
+++ b/net/quic/quic_data_writer.h
@@ -0,0 +1,93 @@
+// 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.
+
+#ifndef NET_QUIC_QUIC_DATA_WRITER_H_
+#define NET_QUIC_QUIC_DATA_WRITER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "net/quic/quic_protocol.h"
+#include "net/quic/uint128.h"
+#include "base/string_piece.h"
+
+namespace net {
+
+// This class provides facilities for packing QUIC data.
+//
+// The QuicDataWriter supports appending primitive values (int, string, etc)
+// to a frame instance. The QuicDataWriter grows its internal memory buffer
+// dynamically to hold the sequence of primitive values. The internal memory
+// buffer is exposed as the "data" of the QuicDataWriter.
+class QuicDataWriter {
+ public:
+ ~QuicDataWriter();
+
+ explicit QuicDataWriter(size_t length);
jar (doing other things) 2012/10/14 23:04:38 nit: constructors then destructors.
Ryan Hamilton 2012/10/15 21:22:08 Done.
+
+ // Returns the size of the QuicDataWriter's data.
+ size_t length() const { return length_; }
+
+ // Takes the buffer from the QuicDataWriter.
+ char* take() {
+ char* rv = buffer_;
jar (doing other things) 2012/10/14 23:04:38 nit: Usually we try not to put much code in the he
Ryan Hamilton 2012/10/15 21:22:08 This code mostly came from the SPDY equivalent and
+ buffer_ = NULL;
+ capacity_ = 0;
+ length_ = 0;
+ return rv;
+ }
+
+ // Methods for adding to the payload. These values are appended to the end
+ // of the QuicDataWriter payload. Note - binary integers are written in
+ // host byte order (little endian) not network byte order (big endian).
+ bool WriteUInt8(uint8 value) {
+ return WriteBytes(&value, sizeof(value));
+ }
+ bool WriteUInt16(uint16 value) {
+ return WriteBytes(&value, sizeof(value));
+ }
+ bool WriteUInt32(uint32 value) {
+ return WriteBytes(&value, sizeof(value));
+ }
+ bool WriteUInt48(uint64 value) {
+ uint32 hi = value >> 32;
+ uint32 lo = value & 0x00000000FFFFFFFF;
+ return WriteUInt32(lo) && WriteUInt16(hi);
+ }
+ bool WriteUInt64(uint64 value) {
+ return WriteBytes(&value, sizeof(value));
+ }
+ bool WriteUInt128(uint128 value) {
+ return WriteUInt64(value.lo) && WriteUInt64(value.hi);
+ }
+
+ bool AdvancePointer(uint32 len);
+
+ bool WriteBytes(const void* data, uint32 data_len);
+
+ static void WriteUint64ToBuffer(uint64 value, char* buffer);
+ static void WriteUint128ToBuffer(uint128 value, char* buffer);
jar (doing other things) 2012/10/14 23:04:38 This API is a bit scary (no way to check). Is thi
Ryan Hamilton 2012/10/15 21:22:08 I believe these methods are used for tweaking fiel
+
+ size_t capacity() const {
+ return capacity_;
+ }
+
+ protected:
+ const char* end_of_payload() const { return buffer_ + length_; }
+
+ private:
+ // Returns the location that the data should be written at, or NULL if there
+ // is not enough room. Call EndWrite with the returned offset and the given
+ // length to pad out for the next write.
+ char* BeginWrite(size_t length);
+
+ char* buffer_;
+ size_t capacity_; // Allocation size of payload (or -1 if buffer is const).
+ size_t length_; // current length of the buffer
jar (doing other things) 2012/10/14 23:04:38 nit: Capital and period.
Ryan Hamilton 2012/10/15 21:22:08 Done.
+};
+
+} // namespace net
+
+#endif // NET_QUIC_QUIC_DATA_WRITER_H_

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