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DataStruct cannot safely be copied if its mCacheFD member is set. Currently there is no code for this case, but to avoid problems later, mark the copy and assignment constructors private and delete them. A move-constructor was added to compensate for the deleted copy constructor. nsTransferable::AddDataFlavor uses this new constructor instead of the previous implicit default copy constructor. MozReview-Commit-ID: 3N5xjFXOUKB --HG-- extra : rebase_source : dc609f20c7048b3630fa99fe2deef3f5be155334
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef nsTransferable_h__
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#define nsTransferable_h__
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#include "nsIFormatConverter.h"
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#include "nsITransferable.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsIPrincipal.h"
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#include "prio.h"
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class nsIMutableArray;
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//
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// DataStruct
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//
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// Holds a flavor (a mime type) that describes the data and the associated data.
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//
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struct DataStruct
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{
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explicit DataStruct ( const char* aFlavor )
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: mDataLen(0), mCacheFD(nullptr), mFlavor(aFlavor) { }
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DataStruct(DataStruct&& aRHS);
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~DataStruct();
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const nsCString& GetFlavor() const { return mFlavor; }
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void SetData( nsISupports* inData, uint32_t inDataLen, bool aIsPrivateData );
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void GetData( nsISupports** outData, uint32_t *outDataLen );
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bool IsDataAvailable() const { return mData ? mDataLen > 0 : mCacheFD != nullptr; }
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protected:
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enum {
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// The size of data over which we write the data to disk rather than
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// keep it around in memory.
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kLargeDatasetSize = 1000000 // 1 million bytes
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};
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nsresult WriteCache(nsISupports* aData, uint32_t aDataLen );
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nsresult ReadCache(nsISupports** aData, uint32_t* aDataLen );
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// mData + mDataLen OR mCacheFD should be used, not both.
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nsCOMPtr<nsISupports> mData; // OWNER - some varient of primitive wrapper
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uint32_t mDataLen;
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PRFileDesc* mCacheFD;
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const nsCString mFlavor;
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private:
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DataStruct(const DataStruct&) = delete;
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DataStruct& operator=(const DataStruct&) = delete;
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};
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/**
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* XP Transferable wrapper
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*/
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class nsTransferable : public nsITransferable
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{
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public:
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nsTransferable();
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// nsISupports
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NS_DECL_ISUPPORTS
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NS_DECL_NSITRANSFERABLE
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protected:
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virtual ~nsTransferable();
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// get flavors w/out converter
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already_AddRefed<nsIMutableArray> GetTransferDataFlavors();
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nsTArray<DataStruct> mDataArray;
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nsCOMPtr<nsIFormatConverter> mFormatConv;
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bool mPrivateData;
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nsCOMPtr<nsIPrincipal> mRequestingPrincipal;
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nsContentPolicyType mContentPolicyType;
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#if DEBUG
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bool mInitialized;
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#endif
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};
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#endif // nsTransferable_h__
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