Initial CLD2 source upload.

git-svn-id: https://cld2.googlecode.com/svn/trunk@3 b252ecd4-b096-bf77-eb8e-91563289f87e

internal/stringpiece.h

@@ -0,0 +1,78 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//
+// A StringPiece points to part or all of a string, 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. [subset]
+//
+
+#ifndef STRINGS_STRINGPIECE_H_
+#define STRINGS_STRINGPIECE_H_
+
+#include <string.h>
+#include <string>
+
+
+typedef int stringpiece_ssize_type;
+
+class StringPiece {
+ private:
+  const char* ptr_;
+  stringpiece_ssize_type length_;
+
+ public:
+  // We provide non-explicit singleton constructors so users can pass
+  // in a "const char*" or a "string" wherever a "StringPiece" is
+  // expected.
+  StringPiece() : ptr_(NULL), length_(0) {}
+
+  StringPiece(const char* str)  // NOLINT(runtime/explicit)
+      : ptr_(str), length_(0) {
+    if (str != NULL) {
+      length_ = strlen(str);
+    }
+  }
+
+  StringPiece(const std::string& str)  // NOLINT(runtime/explicit)
+      : ptr_(str.data()), length_(0) {
+    length_ = str.size();
+  }
+
+  StringPiece(const char* offset, stringpiece_ssize_type len)
+      : ptr_(offset), length_(len) {
+  }
+
+  void remove_prefix(stringpiece_ssize_type n) {
+    ptr_ += n;
+    length_ -= n;
+  }
+
+  void remove_suffix(stringpiece_ssize_type n) {
+    length_ -= n;
+  }
+
+  // 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; }
+};
+
+class StringPiece;
+
+#endif  // STRINGS_STRINGPIECE_H__