mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_textdecoder_h_
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#define mozilla_dom_textdecoder_h_
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#include "jsapi.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/TextDecoderBinding.h"
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#include "mozilla/dom/TypedArray.h"
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#include "mozilla/ErrorResult.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsString.h"
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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namespace mozilla {
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namespace dom {
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class TextDecoder : public nsISupports, public nsWrapperCache
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(TextDecoder)
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// The WebIDL constructor.
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static already_AddRefed<TextDecoder>
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Constructor(nsISupports* aGlobal,
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const nsAString& aEncoding,
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const TextDecoderOptions& aFatal,
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ErrorResult& aRv)
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{
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nsRefPtr<TextDecoder> txtDecoder = new TextDecoder(aGlobal);
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txtDecoder->Init(aEncoding, aFatal, aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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return txtDecoder.forget();
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}
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TextDecoder(nsISupports* aGlobal)
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: mGlobal(aGlobal), mFatal(false), mOffset(0), mIsUTF16Family(false)
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{
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MOZ_ASSERT(aGlobal);
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SetIsDOMBinding();
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}
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virtual
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~TextDecoder()
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{}
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virtual JSObject*
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WrapObject(JSContext* aCx, JSObject* aScope, bool* aTriedToWrap)
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{
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return TextDecoderBinding::Wrap(aCx, aScope, this, aTriedToWrap);
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}
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nsISupports*
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GetParentObject()
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{
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return mGlobal;
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}
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/**
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* Return the encoding name.
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*
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* @param aEncoding, current encoding.
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*/
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void GetEncoding(nsAString& aEncoding);
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/**
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* Decodes incoming byte stream of characters in charset indicated by
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* encoding.
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*
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* The encoding algorithm state is reset if aOptions.stream is not set.
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*
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* If the fatal flag is set then a decoding error will throw EncodingError.
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* Else the decoder will return a decoded string with replacement
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* character(s) for unidentified character(s).
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*
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* @param aView, incoming byte stream of characters to be decoded to
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* to UTF-16 code points.
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* @param aOptions, indicates if streaming or not.
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* @param aOutDecodedString, decoded string of UTF-16 code points.
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* @param aRv, error result.
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*/
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void Decode(const ArrayBufferView* aView,
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const TextDecodeOptions& aOptions,
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nsAString& aOutDecodedString,
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ErrorResult& aRv);
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private:
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nsCString mEncoding;
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nsCOMPtr<nsIUnicodeDecoder> mDecoder;
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nsCOMPtr<nsISupports> mGlobal;
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bool mFatal;
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uint8_t mOffset;
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char mInitialBytes[3];
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bool mIsUTF16Family;
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/**
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* Validates provided encoding and throws an exception if invalid encoding.
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* If no encoding is provided then mEncoding is default initialised to "utf-8".
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*
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* @param aEncoding Optional encoding (case insensitive) provided.
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* Default value is "utf-8" if no encoding is provided.
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* @param aFatal aFatal, indicates whether to throw an 'EncodingError'
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* exception or not.
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* @return aRv EncodingError exception else null.
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*/
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void Init(const nsAString& aEncoding,
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const TextDecoderOptions& aFatal,
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ErrorResult& aRv);
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// Internal helper functions.
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void ResetDecoder();
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void HandleBOM(const char*& aData, uint32_t& aLength,
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const TextDecodeOptions& aOptions,
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nsAString& aOutString, ErrorResult& aRv);
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void FeedBytes(const char* aBytes, nsAString* aOutString = nullptr);
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};
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} // dom
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} // mozilla
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#endif // mozilla_dom_textdecoder_h_
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