Implement Encoding API

Source/modules/encoding/TextEncoder.cpp

+/*
+ * Copyright (C) 2013 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.
+ */
+
+#include "config.h"
+
+#include "modules/encoding/TextEncoder.h"
+
+#include "bindings/v8/Dictionary.h"
+#include "bindings/v8/ExceptionState.h"
+#include "wtf/text/CString.h"
+#include "wtf/text/TextEncodingRegistry.h"
+
+namespace WebCore {
+
+PassRefPtr<TextEncoder> TextEncoder::create(const String& utfLabel, ExceptionState& es)
+{
+    const String& encodingLabel = utfLabel.isNull() ? String("utf-8") : utfLabel;
+
+    // FIXME: Types don't match Encoding spec, e.g. "ascii" => "US-ASCII" not "UTF-8".
+
+    WTF::TextEncoding encoding(encodingLabel);
+    if (!encoding.isValid()) {
+        es.throwTypeError();
+        return 0;
+    }
+
+    String name(encoding.name());
+    if (name != "UTF-8" && name != "UTF-16LE" && name != "UTF-16BE") {
+        es.throwTypeError();
+        return 0;
+    }
+
+    return adoptRef(new TextEncoder(encoding.name()));
+}
+
+TextEncoder::TextEncoder(const String& encoding)
+    : m_encoding(encoding)
+    , m_codec(newTextCodec(m_encoding))
+{
+}
+
+TextEncoder::~TextEncoder()
+{
+}
+
+String TextEncoder::encoding() const
+{
+    return String(m_encoding.name()).lower();
+}
+
+PassRefPtr<Uint8Array> TextEncoder::encode(const String& input, const Dictionary& options)
+{
+    bool stream = false;
+    options.get("stream", stream);
+
+    // FIXME: Not flushing is not supported by TextCodec for encode; add it or
+    // handle split surrogates here.
+
+    CString result;
+    if (input.is8Bit())
+        result = m_codec->encode(input.characters8(), input.length(), WTF::QuestionMarksForUnencodables);
+    else
+        result = m_codec->encode(input.characters16(), input.length(), WTF::QuestionMarksForUnencodables);
+
+    const char* buffer = result.data();
+    const unsigned char* unsignedBuffer = reinterpret_cast<const unsigned char*>(buffer);
+
+    return Uint8Array::create(unsignedBuffer, result.length());
+}
+
+} // namespace WebCore