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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * 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 contains the declaration of class TextReader.
+
+#ifndef O3D_UTILS_CROSS_TEXT_READER_H_
+#define O3D_UTILS_CROSS_TEXT_READER_H_
+
+#include <string>
+#include "base/basictypes.h"
+
+namespace o3d {
+
+// TextReader is the abstract base class of classes
+// that read a sequence of characters to an underlying
+// medium.
+class TextReader {
+ public:
+  // Construct a new TextReader.
+  TextReader();
+  virtual ~TextReader();
+
+  // Returns true if at the end of the input.
+  virtual bool IsAtEnd() const = 0;
+
+  // Read ahead up to count characters and return them as a string,
+  // but don't modify the input's current position.  Returns the empty
+  // string if at the end of the input.
+  virtual std::string PeekString(std::string::size_type count) const = 0;
+
+  // Read a single character.
+  virtual char ReadChar() = 0;
+
+  // Read a number of characters as a string.  If the input isn't that
+  // long, the string may be shorter than the given number of
+  // characters.  Returns an empty string if it is already at the end
+  // of the input or if there is an error.
+  virtual std::string ReadString(std::string::size_type count) = 0;
+
+  // Read a line of text, terminated by any kind of line terminator
+  // (LF/CRLF/CR).  Returns the empty string if at end of input, or if
+  // there is an error.
+  virtual std::string ReadLine() = 0;
+
+  // Read the remaining file into a string, linefeeds and all.
+  // Returns the empty string if already at the end of the file or
+  // there is an error.
+  virtual std::string ReadToEnd() = 0;
+
+ protected:
+  // Returns length of EOL marker (one or two characters) if the given
+  // character string starts with an end of line marker.  Returns zero
+  // if there is no EOL marker at the BEGINNING of the string.
+  static int TestForEndOfLine(const std::string& eol);
+
+ private:
+
+  DISALLOW_COPY_AND_ASSIGN(TextReader);
+};
+}  // namespace o3d
+
+#endif  // O3D_UTILS_CROSS_TEXT_READER_H_