Implement Encoding API

Source/modules/encoding/TextDecoder.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
@@ skipping 11 matching lines @@
  * 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/TextDecoder.h"
+
 #include "bindings/v8/ExceptionState.h"
-
-#include "bindings/v8/V8ThrowException.h"
 #include "core/dom/ExceptionCode.h"
+#include "wtf/text/TextEncodingRegistry.h"
 
 namespace WebCore {
 
-void ExceptionState::clearException()
+PassRefPtr<TextDecoder> TextDecoder::create(const String& label, const Dictionary& options, ExceptionState& es)
 {
-    m_code = 0;
-    m_exception.clear();
+    const String& encodingLabel = label.isNull() ? String("utf-8") : label;
+
+    WTF::TextEncoding encoding(encodingLabel);
+    if (!encoding.isValid()) {
+        es.throwTypeError();
+        return 0;
+    }
+
+    bool fatal = false;
+    options.get("fatal", fatal);
+
+    return adoptRef(new TextDecoder(encoding.name(), fatal));
 }
 
-void ExceptionState::throwDOMException(const ExceptionCode& ec, const String& message)
+
+TextDecoder::TextDecoder(const String& encoding, bool fatal)
+    : m_encoding(encoding)
+    , m_codec(newTextCodec(m_encoding))
+    , m_fatal(fatal)
 {
-    ASSERT(ec);
-    m_code = ec;
-    setException(V8ThrowException::createDOMException(ec, message, m_isolate));
 }
 
-void ExceptionState::setException(v8::Handle<v8::Value> exception)
+TextDecoder::~TextDecoder()
 {
-    if (exception.IsEmpty()) {
-        clearException();
-        return;
+}
+
+String TextDecoder::encoding() const
+{
+    return String(m_encoding.name()).lower();
+}
+
+String TextDecoder::decode(ArrayBufferView* input, const Dictionary& options, ExceptionState& es)
+{
+    bool stream = false;
+    options.get("stream", stream);
+
+    const char* start = input ? static_cast<const char*>(input->baseAddress()) : 0;
+    size_t length = input ? input->byteLength() : 0;
+
+    bool flush = !stream;
+
+    // FIXME: Not all TextCodec implementations handle |flush| - notably TextCodecUTF16
+    // ignores it and never flushes!
+
+    bool sawError = false;
+    String s = m_codec->decode(start, length, flush, m_fatal, sawError);
+
+    if (m_fatal && sawError) {
+        es.throwDOMException(EncodingError, "The encoded data was not valid.");
+        return String();
     }
 
-    m_exception.set(m_isolate, exception);
-}
-
-void ExceptionState::throwTypeError(const String& message)
-{
-    m_code = TypeError;
-    setException(V8ThrowException::createTypeError(message, m_isolate));
-}
-
-NonThrowExceptionState::NonThrowExceptionState()
-    : ExceptionState(0) { }
-
-void NonThrowExceptionState::throwDOMException(const ExceptionCode& ec, const String&)
-{
-    m_code = ec;
-}
-
-void NonThrowExceptionState::throwTypeError(const String&)
-{
-    m_code = TypeError;
+    return s;
 }
 
 } // namespace WebCore