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

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

Index: third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h b/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
deleted file mode 100644
index 353a60d37c7c107cd8f08e9d49fa9806e764f44c..0000000000000000000000000000000000000000
--- a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
+++ /dev/null
@@ -1,440 +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.
-
-// A StringPiece points to part or all of a string, Cord, double-quoted string
-// literal, or other string-like object.  A StringPiece does *not* own the
-// string to which it points.  A StringPiece is not null-terminated.
-//
-// You can use StringPiece as a function or method parameter.  A StringPiece
-// parameter can receive a double-quoted string literal argument, a "const
-// char*" argument, a string argument, or a StringPiece argument with no data
-// copying.  Systematic use of StringPiece for arguments reduces data
-// copies and strlen() calls.
-//
-// Prefer passing StringPieces by value:
-//   void MyFunction(StringPiece arg);
-// If circumstances require, you may also pass by const reference:
-//   void MyFunction(const StringPiece& arg);  // not preferred
-// Both of these have the same lifetime semantics.  Passing by value
-// generates slightly smaller code.  For more discussion, see the thread
-// go/stringpiecebyvalue on c-users.
-//
-// StringPiece is also suitable for local variables if you know that
-// the lifetime of the underlying object is longer than the lifetime
-// of your StringPiece variable.
-//
-// Beware of binding a StringPiece to a temporary:
-//   StringPiece sp = obj.MethodReturningString();  // BAD: lifetime problem
-//
-// This code is okay:
-//   string str = obj.MethodReturningString();  // str owns its contents
-//   StringPiece sp(str);  // GOOD, because str outlives sp
-//
-// StringPiece is sometimes a poor choice for a return value and usually a poor
-// choice for a data member.  If you do use a StringPiece this way, it is your
-// responsibility to ensure that the object pointed to by the StringPiece
-// outlives the StringPiece.
-//
-// A StringPiece may represent just part of a string; thus the name "Piece".
-// For example, when splitting a string, vector<StringPiece> is a natural data
-// type for the output.  For another example, a Cord is a non-contiguous,
-// potentially very long string-like object.  The Cord class has an interface
-// that iteratively provides StringPiece objects that point to the
-// successive pieces of a Cord object.
-//
-// A StringPiece is not null-terminated.  If you write code that scans a
-// StringPiece, you must check its length before reading any characters.
-// Common idioms that work on null-terminated strings do not work on
-// StringPiece objects.
-//
-// There are several ways to create a null StringPiece:
-//   StringPiece()
-//   StringPiece(NULL)
-//   StringPiece(NULL, 0)
-// For all of the above, sp.data() == NULL, sp.length() == 0,
-// and sp.empty() == true.  Also, if you create a StringPiece with
-// a non-NULL pointer then sp.data() != NULL.  Once created,
-// sp.data() will stay either NULL or not-NULL, except if you call
-// sp.clear() or sp.set().
-//
-// Thus, you can use StringPiece(NULL) to signal an out-of-band value
-// that is different from other StringPiece values.  This is similar
-// to the way that const char* p1 = NULL; is different from
-// const char* p2 = "";.
-//
-// There are many ways to create an empty StringPiece:
-//   StringPiece()
-//   StringPiece(NULL)
-//   StringPiece(NULL, 0)
-//   StringPiece("")
-//   StringPiece("", 0)
-//   StringPiece("abcdef", 0)
-//   StringPiece("abcdef"+6, 0)
-// For all of the above, sp.length() will be 0 and sp.empty() will be true.
-// For some empty StringPiece values, sp.data() will be NULL.
-// For some empty StringPiece values, sp.data() will not be NULL.
-//
-// Be careful not to confuse: null StringPiece and empty StringPiece.
-// The set of empty StringPieces properly includes the set of null StringPieces.
-// That is, every null StringPiece is an empty StringPiece,
-// but some non-null StringPieces are empty Stringpieces too.
-//
-// All empty StringPiece values compare equal to each other.
-// Even a null StringPieces compares equal to a non-null empty StringPiece:
-//  StringPiece() == StringPiece("", 0)
-//  StringPiece(NULL) == StringPiece("abc", 0)
-//  StringPiece(NULL, 0) == StringPiece("abcdef"+6, 0)
-//
-// Look carefully at this example:
-//   StringPiece("") == NULL
-// True or false?  TRUE, because StringPiece::operator== converts
-// the right-hand side from NULL to StringPiece(NULL),
-// and then compares two zero-length spans of characters.
-// However, we are working to make this example produce a compile error.
-//
-// Suppose you want to write:
-//   bool TestWhat?(StringPiece sp) { return sp == NULL; }  // BAD
-// Do not do that.  Write one of these instead:
-//   bool TestNull(StringPiece sp) { return sp.data() == NULL; }
-//   bool TestEmpty(StringPiece sp) { return sp.empty(); }
-// The intent of TestWhat? is unclear.  Did you mean TestNull or TestEmpty?
-// Right now, TestWhat? behaves likes TestEmpty.
-// We are working to make TestWhat? produce a compile error.
-// TestNull is good to test for an out-of-band signal.
-// TestEmpty is good to test for an empty StringPiece.
-//
-// Caveats (again):
-// (1) The lifetime of the pointed-to string (or piece of a string)
-//     must be longer than the lifetime of the StringPiece.
-// (2) There may or may not be a '\0' character after the end of
-//     StringPiece data.
-// (3) A null StringPiece is empty.
-//     An empty StringPiece may or may not be a null StringPiece.
-
-#ifndef GOOGLE_PROTOBUF_STUBS_STRINGPIECE_H_
-#define GOOGLE_PROTOBUF_STUBS_STRINGPIECE_H_
-
-#include <assert.h>
-#include <stddef.h>
-#include <string.h>
-#include <iosfwd>
-#include <limits>
-#include <string>
-
-#include <google/protobuf/stubs/common.h>
-
-namespace google {
-namespace protobuf {
-// StringPiece has *two* size types.
-// StringPiece::size_type
-//   is unsigned
-//   is 32 bits in LP32, 64 bits in LP64, 64 bits in LLP64
-//   no future changes intended
-// stringpiece_ssize_type
-//   is signed
-//   is 32 bits in LP32, 64 bits in LP64, 64 bits in LLP64
-//   future changes intended: http://go/64BitStringPiece
-//
-typedef string::difference_type stringpiece_ssize_type;
-
-// STRINGPIECE_CHECK_SIZE protects us from 32-bit overflows.
-// TODO(mec): delete this after stringpiece_ssize_type goes 64 bit.
-#if !defined(NDEBUG)
-#define STRINGPIECE_CHECK_SIZE 1
-#elif defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
-#define STRINGPIECE_CHECK_SIZE 1
-#else
-#define STRINGPIECE_CHECK_SIZE 0
-#endif
-
-class LIBPROTOBUF_EXPORT StringPiece {
- private:
-  const char* ptr_;
-  stringpiece_ssize_type length_;
-
-  // Prevent overflow in debug mode or fortified mode.
-  // sizeof(stringpiece_ssize_type) may be smaller than sizeof(size_t).
-  static stringpiece_ssize_type CheckedSsizeTFromSizeT(size_t size) {
-#if STRINGPIECE_CHECK_SIZE > 0
-#ifdef max
-#undef max
-#endif
-    if (size > static_cast<size_t>(
-        std::numeric_limits<stringpiece_ssize_type>::max())) {
-      // Some people grep for this message in logs
-      // so take care if you ever change it.
-      LogFatalSizeTooBig(size, "size_t to int conversion");
-    }
-#endif
-    return static_cast<stringpiece_ssize_type>(size);
-  }
-
-  // Out-of-line error path.
-  static void LogFatalSizeTooBig(size_t size, const char* details);
-
- public:
-  // We provide non-explicit singleton constructors so users can pass
-  // in a "const char*" or a "string" wherever a "StringPiece" is
-  // expected.
-  //
-  // Style guide exception granted:
-  // http://goto/style-guide-exception-20978288
-  StringPiece() : ptr_(NULL), length_(0) {}
-
-  StringPiece(const char* str)  // NOLINT(runtime/explicit)
-      : ptr_(str), length_(0) {
-    if (str != NULL) {
-      length_ = CheckedSsizeTFromSizeT(strlen(str));
-    }
-  }
-
-  template <class Allocator>
-  StringPiece(  // NOLINT(runtime/explicit)
-      const std::basic_string<char, std::char_traits<char>, Allocator>& str)
-      : ptr_(str.data()), length_(0) {
-    length_ = CheckedSsizeTFromSizeT(str.size());
-  }
-#if defined(HAS_GLOBAL_STRING)
-  template <class Allocator>
-  StringPiece(  // NOLINT(runtime/explicit)
-      const basic_string<char, std::char_traits<char>, Allocator>& str)
-      : ptr_(str.data()), length_(0) {
-    length_ = CheckedSsizeTFromSizeT(str.size());
-  }
-#endif
-
-  StringPiece(const char* offset, stringpiece_ssize_type len)
-      : ptr_(offset), length_(len) {
-    assert(len >= 0);
-  }
-
-  // Substring of another StringPiece.
-  // pos must be non-negative and <= x.length().
-  StringPiece(StringPiece x, stringpiece_ssize_type pos);
-  // Substring of another StringPiece.
-  // pos must be non-negative and <= x.length().
-  // len must be non-negative and will be pinned to at most x.length() - pos.
-  StringPiece(StringPiece x,
-              stringpiece_ssize_type pos,
-              stringpiece_ssize_type len);
-
-  // data() may return a pointer to a buffer with embedded NULs, and the
-  // returned buffer may or may not be null terminated.  Therefore it is
-  // typically a mistake to pass data() to a routine that expects a NUL
-  // terminated string.
-  const char* data() const { return ptr_; }
-  stringpiece_ssize_type size() const { return length_; }
-  stringpiece_ssize_type length() const { return length_; }
-  bool empty() const { return length_ == 0; }
-
-  void clear() {
-    ptr_ = NULL;
-    length_ = 0;
-  }
-
-  void set(const char* data, stringpiece_ssize_type len) {
-    assert(len >= 0);
-    ptr_ = data;
-    length_ = len;
-  }
-
-  void set(const char* str) {
-    ptr_ = str;
-    if (str != NULL)
-      length_ = CheckedSsizeTFromSizeT(strlen(str));
-    else
-      length_ = 0;
-  }
-
-  void set(const void* data, stringpiece_ssize_type len) {
-    ptr_ = reinterpret_cast<const char*>(data);
-    length_ = len;
-  }
-
-  char operator[](stringpiece_ssize_type i) const {
-    assert(0 <= i);
-    assert(i < length_);
-    return ptr_[i];
-  }
-
-  void remove_prefix(stringpiece_ssize_type n) {
-    assert(length_ >= n);
-    ptr_ += n;
-    length_ -= n;
-  }
-
-  void remove_suffix(stringpiece_ssize_type n) {
-    assert(length_ >= n);
-    length_ -= n;
-  }
-
-  // returns {-1, 0, 1}
-  int compare(StringPiece x) const {
-    const stringpiece_ssize_type min_size =
-        length_ < x.length_ ? length_ : x.length_;
-    int r = memcmp(ptr_, x.ptr_, min_size);
-    if (r < 0) return -1;
-    if (r > 0) return 1;
-    if (length_ < x.length_) return -1;
-    if (length_ > x.length_) return 1;
-    return 0;
-  }
-
-  string as_string() const {
-    return ToString();
-  }
-  // We also define ToString() here, since many other string-like
-  // interfaces name the routine that converts to a C++ string
-  // "ToString", and it's confusing to have the method that does that
-  // for a StringPiece be called "as_string()".  We also leave the
-  // "as_string()" method defined here for existing code.
-  string ToString() const {
-    if (ptr_ == NULL) return string();
-    return string(data(), size());
-  }
-
-  operator string() const {
-    return ToString();
-  }
-
-  void CopyToString(string* target) const;
-  void AppendToString(string* target) const;
-
-  bool starts_with(StringPiece x) const {
-    return (length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0);
-  }
-
-  bool ends_with(StringPiece x) const {
-    return ((length_ >= x.length_) &&
-            (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
-  }
-
-  // Checks whether StringPiece starts with x and if so advances the beginning
-  // of it to past the match.  It's basically a shortcut for starts_with
-  // followed by remove_prefix.
-  bool Consume(StringPiece x);
-  // Like above but for the end of the string.
-  bool ConsumeFromEnd(StringPiece x);
-
-  // standard STL container boilerplate
-  typedef char value_type;
-  typedef const char* pointer;
-  typedef const char& reference;
-  typedef const char& const_reference;
-  typedef size_t size_type;
-  typedef ptrdiff_t difference_type;
-  static const size_type npos;
-  typedef const char* const_iterator;
-  typedef const char* iterator;
-  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
-  typedef std::reverse_iterator<iterator> reverse_iterator;
-  iterator begin() const { return ptr_; }
-  iterator end() const { return ptr_ + length_; }
-  const_reverse_iterator rbegin() const {
-    return const_reverse_iterator(ptr_ + length_);
-  }
-  const_reverse_iterator rend() const {
-    return const_reverse_iterator(ptr_);
-  }
-  stringpiece_ssize_type max_size() const { return length_; }
-  stringpiece_ssize_type capacity() const { return length_; }
-
-  // cpplint.py emits a false positive [build/include_what_you_use]
-  stringpiece_ssize_type copy(char* buf, size_type n, size_type pos = 0) const;  // NOLINT
-
-  bool contains(StringPiece s) const;
-
-  stringpiece_ssize_type find(StringPiece s, size_type pos = 0) const;
-  stringpiece_ssize_type find(char c, size_type pos = 0) const;
-  stringpiece_ssize_type rfind(StringPiece s, size_type pos = npos) const;
-  stringpiece_ssize_type rfind(char c, size_type pos = npos) const;
-
-  stringpiece_ssize_type find_first_of(StringPiece s, size_type pos = 0) const;
-  stringpiece_ssize_type find_first_of(char c, size_type pos = 0) const {
-    return find(c, pos);
-  }
-  stringpiece_ssize_type find_first_not_of(StringPiece s,
-                                           size_type pos = 0) const;
-  stringpiece_ssize_type find_first_not_of(char c, size_type pos = 0) const;
-  stringpiece_ssize_type find_last_of(StringPiece s,
-                                      size_type pos = npos) const;
-  stringpiece_ssize_type find_last_of(char c, size_type pos = npos) const {
-    return rfind(c, pos);
-  }
-  stringpiece_ssize_type find_last_not_of(StringPiece s,
-                                          size_type pos = npos) const;
-  stringpiece_ssize_type find_last_not_of(char c, size_type pos = npos) const;
-
-  StringPiece substr(size_type pos, size_type n = npos) const;
-};
-
-// This large function is defined inline so that in a fairly common case where
-// one of the arguments is a literal, the compiler can elide a lot of the
-// following comparisons.
-inline bool operator==(StringPiece x, StringPiece y) {
-  stringpiece_ssize_type len = x.size();
-  if (len != y.size()) {
-    return false;
-  }
-
-  return x.data() == y.data() || len <= 0 ||
-      memcmp(x.data(), y.data(), len) == 0;
-}
-
-inline bool operator!=(StringPiece x, StringPiece y) {
-  return !(x == y);
-}
-
-inline bool operator<(StringPiece x, StringPiece y) {
-  const stringpiece_ssize_type min_size =
-      x.size() < y.size() ? x.size() : y.size();
-  const int r = memcmp(x.data(), y.data(), min_size);
-  return (r < 0) || (r == 0 && x.size() < y.size());
-}
-
-inline bool operator>(StringPiece x, StringPiece y) {
-  return y < x;
-}
-
-inline bool operator<=(StringPiece x, StringPiece y) {
-  return !(x > y);
-}
-
-inline bool operator>=(StringPiece x, StringPiece y) {
-  return !(x < y);
-}
-
-// allow StringPiece to be logged
-extern std::ostream& operator<<(std::ostream& o, StringPiece piece);
-
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // STRINGS_STRINGPIECE_H_