Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/stubs/bytestream.h

Index: third_party/protobuf/src/google/protobuf/stubs/bytestream.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/bytestream.h b/third_party/protobuf/src/google/protobuf/stubs/bytestream.h
deleted file mode 100644
index de8e0204580ae80af6d1b2226f899b3bb9595a57..0000000000000000000000000000000000000000
--- a/third_party/protobuf/src/google/protobuf/stubs/bytestream.h
+++ /dev/null
@@ -1,348 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file declares the ByteSink and ByteSource abstract interfaces. These
-// interfaces represent objects that consume (ByteSink) or produce (ByteSource)
-// a sequence of bytes. Using these abstract interfaces in your APIs can help
-// make your code work with a variety of input and output types.
-//
-// This file also declares the following commonly used implementations of these
-// interfaces.
-//
-//   ByteSink:
-//      UncheckedArrayByteSink  Writes to an array, without bounds checking
-//      CheckedArrayByteSink    Writes to an array, with bounds checking
-//      GrowingArrayByteSink    Allocates and writes to a growable buffer
-//      StringByteSink          Writes to an STL string
-//      NullByteSink            Consumes a never-ending stream of bytes
-//
-//   ByteSource:
-//      ArrayByteSource         Reads from an array or string/StringPiece
-//      LimitedByteSource       Limits the number of bytes read from an
-
-#ifndef GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_
-#define GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_
-
-#include <stddef.h>
-#include <string>
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/stringpiece.h>
-
-class CordByteSink;
-class MemBlock;
-
-namespace google {
-namespace protobuf {
-namespace strings {
-
-// An abstract interface for an object that consumes a sequence of bytes. This
-// interface offers 3 different ways to append data, and a Flush() function.
-//
-// Example:
-//
-//   string my_data;
-//   ...
-//   ByteSink* sink = ...
-//   sink->Append(my_data.data(), my_data.size());
-//   sink->Flush();
-//
-class LIBPROTOBUF_EXPORT ByteSink {
- public:
-  ByteSink() {}
-  virtual ~ByteSink() {}
-
-  // Appends the "n" bytes starting at "bytes".
-  virtual void Append(const char* bytes, size_t n) = 0;
-
-  // Flushes internal buffers. The default implemenation does nothing. ByteSink
-  // subclasses may use internal buffers that require calling Flush() at the end
-  // of the stream.
-  virtual void Flush();
-
- private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ByteSink);
-};
-
-// An abstract interface for an object that produces a fixed-size sequence of
-// bytes.
-//
-// Example:
-//
-//   ByteSource* source = ...
-//   while (source->Available() > 0) {
-//     StringPiece data = source->Peek();
-//     ... do something with "data" ...
-//     source->Skip(data.length());
-//   }
-//
-class LIBPROTOBUF_EXPORT ByteSource {
- public:
-  ByteSource() {}
-  virtual ~ByteSource() {}
-
-  // Returns the number of bytes left to read from the source. Available()
-  // should decrease by N each time Skip(N) is called. Available() may not
-  // increase. Available() returning 0 indicates that the ByteSource is
-  // exhausted.
-  //
-  // Note: Size() may have been a more appropriate name as it's more
-  //       indicative of the fixed-size nature of a ByteSource.
-  virtual size_t Available() const = 0;
-
-  // Returns a StringPiece of the next contiguous region of the source. Does not
-  // reposition the source. The returned region is empty iff Available() == 0.
-  //
-  // The returned region is valid until the next call to Skip() or until this
-  // object is destroyed, whichever occurs first.
-  //
-  // The length of the returned StringPiece will be <= Available().
-  virtual StringPiece Peek() = 0;
-
-  // Skips the next n bytes. Invalidates any StringPiece returned by a previous
-  // call to Peek().
-  //
-  // REQUIRES: Available() >= n
-  virtual void Skip(size_t n) = 0;
-
-  // Writes the next n bytes in this ByteSource to the given ByteSink, and
-  // advances this ByteSource past the copied bytes. The default implementation
-  // of this method just copies the bytes normally, but subclasses might
-  // override CopyTo to optimize certain cases.
-  //
-  // REQUIRES: Available() >= n
-  virtual void CopyTo(ByteSink* sink, size_t n);
-
- private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ByteSource);
-};
-
-//
-// Some commonly used implementations of ByteSink
-//
-
-// Implementation of ByteSink that writes to an unsized byte array. No
-// bounds-checking is performed--it is the caller's responsibility to ensure
-// that the destination array is large enough.
-//
-// Example:
-//
-//   char buf[10];
-//   UncheckedArrayByteSink sink(buf);
-//   sink.Append("hi", 2);    // OK
-//   sink.Append(data, 100);  // WOOPS! Overflows buf[10].
-//
-class LIBPROTOBUF_EXPORT UncheckedArrayByteSink : public ByteSink {
- public:
-  explicit UncheckedArrayByteSink(char* dest) : dest_(dest) {}
-  virtual void Append(const char* data, size_t n);
-
-  // Returns the current output pointer so that a caller can see how many bytes
-  // were produced.
-  //
-  // Note: this method is not part of the ByteSink interface.
-  char* CurrentDestination() const { return dest_; }
-
- private:
-  char* dest_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(UncheckedArrayByteSink);
-};
-
-// Implementation of ByteSink that writes to a sized byte array. This sink will
-// not write more than "capacity" bytes to outbuf. Once "capacity" bytes are
-// appended, subsequent bytes will be ignored and Overflowed() will return true.
-// Overflowed() does not cause a runtime error (i.e., it does not CHECK fail).
-//
-// Example:
-//
-//   char buf[10];
-//   CheckedArrayByteSink sink(buf, 10);
-//   sink.Append("hi", 2);    // OK
-//   sink.Append(data, 100);  // Will only write 8 more bytes
-//
-class LIBPROTOBUF_EXPORT CheckedArrayByteSink : public ByteSink {
- public:
-  CheckedArrayByteSink(char* outbuf, size_t capacity);
-  virtual void Append(const char* bytes, size_t n);
-
-  // Returns the number of bytes actually written to the sink.
-  size_t NumberOfBytesWritten() const { return size_; }
-
-  // Returns true if any bytes were discarded, i.e., if there was an
-  // attempt to write more than 'capacity' bytes.
-  bool Overflowed() const { return overflowed_; }
-
- private:
-  char* outbuf_;
-  const size_t capacity_;
-  size_t size_;
-  bool overflowed_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CheckedArrayByteSink);
-};
-
-// Implementation of ByteSink that allocates an internal buffer (a char array)
-// and expands it as needed to accomodate appended data (similar to a string),
-// and allows the caller to take ownership of the internal buffer via the
-// GetBuffer() method. The buffer returned from GetBuffer() must be deleted by
-// the caller with delete[]. GetBuffer() also sets the internal buffer to be
-// empty, and subsequent appends to the sink will create a new buffer. The
-// destructor will free the internal buffer if GetBuffer() was not called.
-//
-// Example:
-//
-//   GrowingArrayByteSink sink(10);
-//   sink.Append("hi", 2);
-//   sink.Append(data, n);
-//   const char* buf = sink.GetBuffer();  // Ownership transferred
-//   delete[] buf;
-//
-class LIBPROTOBUF_EXPORT GrowingArrayByteSink : public strings::ByteSink {
- public:
-  explicit GrowingArrayByteSink(size_t estimated_size);
-  virtual ~GrowingArrayByteSink();
-  virtual void Append(const char* bytes, size_t n);
-
-  // Returns the allocated buffer, and sets nbytes to its size. The caller takes
-  // ownership of the buffer and must delete it with delete[].
-  char* GetBuffer(size_t* nbytes);
-
- private:
-  void Expand(size_t amount);
-  void ShrinkToFit();
-
-  size_t capacity_;
-  char* buf_;
-  size_t size_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GrowingArrayByteSink);
-};
-
-// Implementation of ByteSink that appends to the given string.
-// Existing contents of "dest" are not modified; new data is appended.
-//
-// Example:
-//
-//   string dest = "Hello ";
-//   StringByteSink sink(&dest);
-//   sink.Append("World", 5);
-//   assert(dest == "Hello World");
-//
-class LIBPROTOBUF_EXPORT StringByteSink : public ByteSink {
- public:
-  explicit StringByteSink(string* dest) : dest_(dest) {}
-  virtual void Append(const char* data, size_t n);
-
- private:
-  string* dest_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StringByteSink);
-};
-
-// Implementation of ByteSink that discards all data.
-//
-// Example:
-//
-//   NullByteSink sink;
-//   sink.Append(data, data.size());  // All data ignored.
-//
-class LIBPROTOBUF_EXPORT NullByteSink : public ByteSink {
- public:
-  NullByteSink() {}
-  virtual void Append(const char *data, size_t n) {}
-
- private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(NullByteSink);
-};
-
-//
-// Some commonly used implementations of ByteSource
-//
-
-// Implementation of ByteSource that reads from a StringPiece.
-//
-// Example:
-//
-//   string data = "Hello";
-//   ArrayByteSource source(data);
-//   assert(source.Available() == 5);
-//   assert(source.Peek() == "Hello");
-//
-class LIBPROTOBUF_EXPORT ArrayByteSource : public ByteSource {
- public:
-  explicit ArrayByteSource(StringPiece s) : input_(s) {}
-
-  virtual size_t Available() const;
-  virtual StringPiece Peek();
-  virtual void Skip(size_t n);
-
- private:
-  StringPiece   input_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ArrayByteSource);
-};
-
-// Implementation of ByteSource that wraps another ByteSource, limiting the
-// number of bytes returned.
-//
-// The caller maintains ownership of the underlying source, and may not use the
-// underlying source while using the LimitByteSource object.  The underlying
-// source's pointer is advanced by n bytes every time this LimitByteSource
-// object is advanced by n.
-//
-// Example:
-//
-//   string data = "Hello World";
-//   ArrayByteSource abs(data);
-//   assert(abs.Available() == data.size());
-//
-//   LimitByteSource limit(abs, 5);
-//   assert(limit.Available() == 5);
-//   assert(limit.Peek() == "Hello");
-//
-class LIBPROTOBUF_EXPORT LimitByteSource : public ByteSource {
- public:
-  // Returns at most "limit" bytes from "source".
-  LimitByteSource(ByteSource* source, size_t limit);
-
-  virtual size_t Available() const;
-  virtual StringPiece Peek();
-  virtual void Skip(size_t n);
-
-  // We override CopyTo so that we can forward to the underlying source, in
-  // case it has an efficient implementation of CopyTo.
-  virtual void CopyTo(ByteSink* sink, size_t n);
-
- private:
-  ByteSource* source_;
-  size_t limit_;
-};
-
-}  // namespace strings
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_