Add CTR encryption.

- Added ContentEncAESSettings, AESSettingsCipherMode,
  AESSettingsCipherInitData elements to the parser and muxer.
- Changed ParseContentEncodingsEntry, ParseContentEncodingEntry,
  and ParseEncryptionEntry to use PasreElementHeader.
- Added ParseContentEncAESSettingsEntry function.
- PS6 removed AESSettingsCipherInitData.
- PS9 Addressed comments, Fixed some LINT issues, and converted
  mkvwriter.h/.cpp to Unix line endings.
- PS10 Addressed comments.

Change-Id: I9d96a0c194f74a6c9bf0001aa0286196e410f07e

mkvwriter.cpp

@@ -1,94 +1,94 @@
-// Copyright (c) 2011 The WebM project authors. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the LICENSE file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS.  All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-
-#include "mkvwriter.hpp"
-
-#ifdef _MSC_VER
-#include <share.h> // for _SH_DENYWR
-#endif
-
-#include <new>
-
-namespace mkvmuxer {
-
-MkvWriter::MkvWriter() : file_(NULL) {
-}
-
-MkvWriter::~MkvWriter() {
-  Close();
-}
-
-int32 MkvWriter::Write(const void* buffer, uint32 length) {
-  if (!file_)
-    return -1;
-
-  if (length == 0)
-    return 0;
-
-  if (buffer == NULL)
-    return -1;
-
-  const size_t bytes_written = fwrite(buffer, 1, length, file_);
-
-  return (bytes_written == length) ? 0 : -1;
-}
-
-bool MkvWriter::Open(const char* filename) {
-  if (filename == NULL)
-    return false;
-
-  if (file_)
-    return false;
-
-#ifdef _MSC_VER
-  file_ = _fsopen(filename, "wb", _SH_DENYWR);
-#else
-  file_ = fopen(filename, "wb");
-#endif
-  if (file_ == NULL)
-    return false;
-  return true;
-}
-
-void MkvWriter::Close() {
-  if (file_) {
-    fclose(file_);
-    file_ = NULL;
-  }
-}
-
-int64 MkvWriter::Position() const {
-  if (!file_)
-    return 0;
-
-#ifdef _MSC_VER
-    return _ftelli64(file_);
-#else
-    return ftell(file_);
-#endif
-}
-
-int32 MkvWriter::Position(int64 position) {
-  if (!file_)
-    return -1;
-
-#ifdef _MSC_VER
-    return _fseeki64(file_, position, SEEK_SET);
-#else
-    return fseek(file_, position, SEEK_SET);
-#endif
-}
-
-bool MkvWriter::Seekable() const {
-  return true;
-}
-
-void MkvWriter::ElementStartNotify(uint64, int64) {
-}
-
-}  // namespace mkvmuxer
+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS.  All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+
+#include "mkvwriter.hpp"
+
+#ifdef _MSC_VER
+#include <share.h>  // for _SH_DENYWR
+#endif
+
+#include <new>
+
+namespace mkvmuxer {
+
+MkvWriter::MkvWriter() : file_(NULL) {
+}
+
+MkvWriter::~MkvWriter() {
+  Close();
+}
+
+int32 MkvWriter::Write(const void* buffer, uint32 length) {
+  if (!file_)
+    return -1;
+
+  if (length == 0)
+    return 0;
+
+  if (buffer == NULL)
+    return -1;
+
+  const size_t bytes_written = fwrite(buffer, 1, length, file_);
+
+  return (bytes_written == length) ? 0 : -1;
+}
+
+bool MkvWriter::Open(const char* filename) {
+  if (filename == NULL)
+    return false;
+
+  if (file_)
+    return false;
+
+#ifdef _MSC_VER
+  file_ = _fsopen(filename, "wb", _SH_DENYWR);
+#else
+  file_ = fopen(filename, "wb");
+#endif
+  if (file_ == NULL)
+    return false;
+  return true;
+}
+
+void MkvWriter::Close() {
+  if (file_) {
+    fclose(file_);
+    file_ = NULL;
+  }
+}
+
+int64 MkvWriter::Position() const {
+  if (!file_)
+    return 0;
+
+#ifdef _MSC_VER
+    return _ftelli64(file_);
+#else
+    return ftell(file_);
+#endif
+}
+
+int32 MkvWriter::Position(int64 position) {
+  if (!file_)
+    return -1;
+
+#ifdef _MSC_VER
+    return _fseeki64(file_, position, SEEK_SET);
+#else
+    return fseek(file_, position, SEEK_SET);
+#endif
+}
+
+bool MkvWriter::Seekable() const {
+  return true;
+}
+
+void MkvWriter::ElementStartNotify(uint64, int64) {
+}
+
+}  // namespace mkvmuxer