Add QuicFramer and friends.

net/quic/quic_data_reader.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.
 
-#ifndef NET_SPDY_SPDY_FRAME_READER_H_
-#define NET_SPDY_SPDY_FRAME_READER_H_
+#ifndef NET_QUIC_QUIC_DATA_READER_H_
+#define NET_QUIC_QUIC_DATA_READER_H_
 
 #include "base/basictypes.h"
 #include "base/string_piece.h"
 #include "net/base/net_export.h"
+#include "net/quic/uint128.h"
 
 namespace net {
 
-// Used for reading SPDY frames. Though there isn't really anything terribly
-// SPDY-specific here, it's a helper class that's useful when doing SPDY
+// Used for reading QUIC data. Though there isn't really anything terribly
+// QUIC-specific here, it's a helper class that's useful when doing QUIC
 // framing.
 //
-// To use, simply construct a SpdyFramerReader using the underlying buffer that
+// To use, simply construct a QuicDataReader using the underlying buffer that
 // you'd like to read fields from, then call one of the Read*() methods to
 // actually do some reading.
 //
 // This class keeps an internal iterator to keep track of what's already been
 // read and each successive Read*() call automatically increments said iterator
-// on success. On failure, internal state of the SpdyFrameReader should not be
+// on success. On failure, internal state of the QuicDataReader should not be
 // trusted and it is up to the caller to throw away the failed instance and
 // handle the error as appropriate. None of the Read*() methods should ever be
 // called after failure, as they will also fail immediately.
-class NET_EXPORT_PRIVATE SpdyFrameReader {
+class NET_EXPORT_PRIVATE QuicDataReader {
  public:
   // Caller must provide an underlying buffer to work on.
-  SpdyFrameReader(const char* data, const size_t len);
+  QuicDataReader(const char* data, const size_t len);
 
   // Empty destructor.
-  ~SpdyFrameReader() {}
+  ~QuicDataReader() {}
 
   // Reads a 16-bit unsigned integer into the given output parameter.
-  // Forwards the internal iterater on success.
+  // Forwards the internal iterator on success.
   // Returns true on success, false otherwise.
   bool ReadUInt16(uint16* result);
 
   // Reads a 32-bit unsigned integer into the given output parameter.
-  // Forwards the internal iterater on success.
+  // Forwards the internal iterator on success.
   // Returns true on success, false otherwise.
   bool ReadUInt32(uint32* result);
 
+  // Reads a 48-bit unsigned integer into the given output parameter.
+  // Forwards the internal iterator on success.
+  // Returns true on success, false otherwise.
+  bool ReadUInt48(uint64* result);
+
+  // Reads a 64-bit unsigned integer into the given output parameter.
+  // Forwards the internal iterator on success.
+  // Returns true on success, false otherwise.
+  bool ReadUInt64(uint64* result);
+
+  // Reads a 128-bit unsigned integer into the given output parameter.
+  // Forwards the internal iterator on success.
+  // Returns true on success, false otherwise.
+  bool ReadUInt128(uint128* result);
   // Reads a string prefixed with 16-bit length into the given output parameter.
   //
   // NOTE: Does not copy but rather references strings in the underlying buffer.
   // This should be kept in mind when handling memory management!
   //
-  // Forwards the internal iterater on success.
+  // Forwards the internal iterator on success.
   // Returns true on success, false otherwise.
   bool ReadStringPiece16(base::StringPiece* result);
 
-  // Reads a string prefixed with 32-bit length into the given output parameter.
+  // Reads a given number of bytes into the given buffer. The buffer
+  // must be of adequate size.
+  // Forwards the internal iterator on success.
+  // Returns true on success, false otherwise.
+  bool ReadStringPiece(base::StringPiece* result, size_t len);
+
+  // Returns the remaining payload as a StringPiece.
   //
   // NOTE: Does not copy but rather references strings in the underlying buffer.
   // This should be kept in mind when handling memory management!
   //
-  // Forwards the internal iterater on success.
-  // Returns true on success, false otherwise.
-  bool ReadStringPiece32(base::StringPiece* result);
+  // Forwards the internal iterator.
+  base::StringPiece ReadRemainingPayload();
+
+  // Returns the remaining payload as a StringPiece.
+  //
+  // NOTE: Does not copy but rather references strings in the underlying buffer.
+  // This should be kept in mind when handling memory management!
+  //
+  // DOES NOT forward the internal iterator.
+  base::StringPiece PeekRemainingPayload();
 
   // Reads a given number of bytes into the given buffer. The buffer
   // must be of adequate size.
-  // Forwards the internal iterater on success.
+  // Forwards the internal iterator on success.
   // Returns true on success, false otherwise.
   bool ReadBytes(void* result, size_t size);
 
   // Returns true if the entirety of the underlying buffer has been read via
   // Read*() calls.
   bool IsDoneReading() const;
 
+  // Returns the number of bytes remaining to be read.
+  size_t BytesRemaining() const;
+
  private:
   // Returns true if the underlying buffer has enough room to read the given
   // amount of bytes.
   bool CanRead(size_t bytes) const;
 
   // To be called when a read fails for any reason.
   void OnFailure();
 
   // The data buffer that we're reading from.
   const char* data_;
 
   // The length of the data buffer that we're reading from.
   const size_t len_;
 
   // The location of the next read from our data buffer.
-  size_t ofs_;
+  size_t pos_;
 };
 
 }  // namespace net
 
-#endif  // NET_SPDY_SPDY_FRAME_READER_H_
+#endif  // NET_QUIC_QUIC_DATA_READER_H_