gecko-dev/dom/encoding/TextEncoderBase.h

73 строки
2.1 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_textencoderbase_h_
#define mozilla_dom_textencoderbase_h_
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/TypedArray.h"
#include "nsIUnicodeEncoder.h"
namespace mozilla {
class ErrorResult;
namespace dom {
class TextEncoderBase
{
protected:
TextEncoderBase()
{}
virtual
~TextEncoderBase()
{}
/**
* 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 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, const nsAString& aString,
const bool aStream, ErrorResult& aRv);
protected:
virtual JSObject*
CreateUint8Array(JSContext* aCx, char* aBuf, uint32_t aLen) = 0;
private:
nsCString mEncoding;
nsCOMPtr<nsIUnicodeEncoder> mEncoder;
};
} // dom
} // mozilla
#endif // mozilla_dom_textencoderbase_h_