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