gecko-dev/dom/encoding/TextDecoderBase.h

78 строки
2.2 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_textdecoderbase_h_
#define mozilla_dom_textdecoderbase_h_
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/TypedArray.h"
#include "nsIUnicodeDecoder.h"
namespace mozilla {
class ErrorResult;
namespace dom {
class TextDecoderBase
{
protected:
TextDecoderBase()
: mFatal(false)
{}
virtual
~TextDecoderBase()
{}
/**
* 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.
* Default value is "utf-8" if no encoding is provided.
* @param aFatal aFatal, indicates whether to throw an 'EncodingError'
* exception or not.
* @return aRv EncodingError exception else null.
*/
void Init(const nsAString& aEncoding, const bool aFatal, ErrorResult& aRv);
public:
/**
* Return the encoding name.
*
* @param aEncoding, current encoding.
*/
void GetEncoding(nsAString& aEncoding);
/**
* Decodes incoming byte stream of characters in charset indicated by
* encoding.
*
* The encoding algorithm state is reset if aOptions.mStream is not set.
*
* If the fatal flag is set then a decoding error will throw EncodingError.
* Else the decoder will return a decoded string with replacement
* character(s) for unidentified character(s).
*
* @param aView, incoming byte stream of characters to be decoded to
* to UTF-16 code points.
* @param aOptions, indicates if streaming or not.
* @param aOutDecodedString, decoded string of UTF-16 code points.
* @param aRv, error result.
*/
void Decode(const char* aInput, const int32_t aLength,
const bool aStream, nsAString& aOutDecodedString,
ErrorResult& aRv);
private:
nsCString mEncoding;
nsCOMPtr<nsIUnicodeDecoder> mDecoder;
bool mFatal;
};
} // dom
} // mozilla
#endif // mozilla_dom_textdecoderbase_h_