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118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A class that handles loading and evaluation of <script> elements.
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*/
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#ifndef mozilla_dom_ScriptLoadHandler_h
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#define mozilla_dom_ScriptLoadHandler_h
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#include "nsIIncrementalStreamLoader.h"
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#include "nsISupports.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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class Decoder;
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namespace dom {
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class ScriptLoadRequest;
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class ScriptLoader;
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class SRICheckDataVerifier;
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class ScriptLoadHandler final : public nsIIncrementalStreamLoaderObserver {
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public:
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explicit ScriptLoadHandler(
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ScriptLoader* aScriptLoader, ScriptLoadRequest* aRequest,
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UniquePtr<SRICheckDataVerifier>&& aSRIDataVerifier);
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NS_DECL_ISUPPORTS
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NS_DECL_NSIINCREMENTALSTREAMLOADEROBSERVER
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private:
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virtual ~ScriptLoadHandler();
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/*
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* Decode the given data into the already-allocated internal
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* |ScriptTextBuffer<Unit>|.
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*
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* This function is intended to be called only by |DecodeRawData| after
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* determining which sort of |ScriptTextBuffer<Unit>| has been allocated.
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*/
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template <typename Unit>
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nsresult DecodeRawDataHelper(const uint8_t* aData, uint32_t aDataLength,
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bool aEndOfStream);
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/*
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* Once the charset is found by the EnsureDecoder function, we can
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* incrementally convert the charset to the one expected by the JS Parser.
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*/
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nsresult DecodeRawData(const uint8_t* aData, uint32_t aDataLength,
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bool aEndOfStream);
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/*
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* Discover the charset by looking at the stream data, the script tag, and
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* other indicators. Returns true if charset has been discovered.
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*/
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bool EnsureDecoder(nsIIncrementalStreamLoader* aLoader, const uint8_t* aData,
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uint32_t aDataLength, bool aEndOfStream) {
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// Check if the decoder has already been created.
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if (mDecoder) {
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return true;
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}
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return TrySetDecoder(aLoader, aData, aDataLength, aEndOfStream);
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}
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/*
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* Attempt to determine how script data will be decoded, when such
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* determination hasn't already been made. (If you don't know whether it's
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* been made yet, use |EnsureDecoder| above instead.) Return false if there
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* isn't enough information yet to make the determination, or true if a
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* determination was made.
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*/
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bool TrySetDecoder(nsIIncrementalStreamLoader* aLoader, const uint8_t* aData,
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uint32_t aDataLength, bool aEndOfStream);
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/*
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* When streaming bytecode, we have the opportunity to fallback early if SRI
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* does not match the expectation of the document.
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*
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* If SRI hash is decoded, `sriLength` is set to the length of the hash.
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*/
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nsresult MaybeDecodeSRI(uint32_t* sriLength);
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// Query the channel to find the data type associated with the input stream.
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nsresult EnsureKnownDataType(nsIIncrementalStreamLoader* aLoader);
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// ScriptLoader which will handle the parsed script.
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RefPtr<ScriptLoader> mScriptLoader;
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// The ScriptLoadRequest for this load. Decoded data are accumulated on it.
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RefPtr<ScriptLoadRequest> mRequest;
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// SRI data verifier.
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UniquePtr<SRICheckDataVerifier> mSRIDataVerifier;
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// Status of SRI data operations.
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nsresult mSRIStatus;
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// Unicode decoder for charset.
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mozilla::UniquePtr<mozilla::Decoder> mDecoder;
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// Flipped to true after calling NotifyStart the first time
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bool mPreloadStartNotified = false;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_ScriptLoadHandler_h
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