gecko-dev/dom/encoding/TextEncoder.h

112 строки
3.1 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_textencoder_h_
#define mozilla_dom_textencoder_h_
#include "mozilla/dom/NonRefcountedDOMObject.h"
#include "mozilla/dom/TextEncoderBinding.h"
#include "mozilla/dom/TypedArray.h"
#include "nsIUnicodeEncoder.h"
namespace mozilla {
class ErrorResult;
namespace dom {
class TextEncoder MOZ_FINAL : public NonRefcountedDOMObject
{
public:
// The WebIDL constructor.
static TextEncoder*
Constructor(const GlobalObject& aGlobal,
const nsAString& aEncoding,
ErrorResult& aRv)
{
nsAutoPtr<TextEncoder> txtEncoder(new TextEncoder());
txtEncoder->Init(aEncoding, aRv);
if (aRv.Failed()) {
return nullptr;
}
return txtEncoder.forget();
}
TextEncoder()
{
}
virtual
~TextEncoder()
{}
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope,
bool* aTookOwnership)
{
return TextEncoderBinding::Wrap(aCx, aScope, this, aTookOwnership);
}
nsISupports*
GetParentObject()
{
return nullptr;
}
JSObject* Encode(JSContext* aCx,
JS::Handle<JSObject*> aObj,
const nsAString& aString,
const TextEncodeOptions& aOptions,
ErrorResult& aRv) {
return TextEncoder::Encode(aCx, aObj, aString, aOptions.mStream, aRv);
}
protected:
/**
* Validates provided encoding and throws an exception if invalid encoding.
* If no encoding is provided then mEncoding is default initialised to "utf-8".
*
* @param aEncoding Optional encoding (case insensitive) provided.
* (valid values are "utf-8", "utf-16", "utf-16be")
* Default value is "utf-8" if no encoding is provided.
* @return aRv EncodingError exception else null.
*/
void Init(const nsAString& aEncoding, ErrorResult& aRv);
public:
/**
* Return the encoding name.
*
* @param aEncoding, current encoding.
*/
void GetEncoding(nsAString& aEncoding);
/**
* Encodes incoming utf-16 code units/ DOM string to the requested encoding.
*
* @param aCx Javascript context.
* @param aObj the wrapper of the TextEncoder
* @param aString utf-16 code units to be encoded.
* @param aOptions Streaming option. Initialised by default to false.
* If the streaming option is false, then the encoding
* algorithm state will get reset. If set to true then
* the previous encoding is reused/continued.
* @return JSObject* The Uint8Array wrapped in a JS object.
*/
JSObject* Encode(JSContext* aCx,
JS::Handle<JSObject*> aObj,
const nsAString& aString,
const bool aStream,
ErrorResult& aRv);
private:
nsCString mEncoding;
nsCOMPtr<nsIUnicodeEncoder> mEncoder;
};
} // dom
} // mozilla
#endif // mozilla_dom_textencoder_h_