Revert 162259 - 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_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 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 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 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 QuicDataReader {
- public:
-  // Caller must provide an underlying buffer to work on.
-  QuicDataReader(const char* data, const size_t len);
-
-  // Empty destructor.
-  ~QuicDataReader() {}
-
-  // Reads a 16-bit unsigned integer into the given output parameter.
-  // 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 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 iterator on success.
-  // Returns true on success, false otherwise.
-  bool ReadStringPiece16(base::StringPiece* result);
-
-  // 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 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 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 pos_;
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_QUIC_DATA_READER_H_