mirror of
https://github.com/classilla/tenfourfox.git
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238 lines
7.2 KiB
C++
238 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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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 _nsCacheEntryDescriptor_h_
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#define _nsCacheEntryDescriptor_h_
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#include "nsICacheEntryDescriptor.h"
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#include "nsCacheEntry.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsCacheService.h"
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#include "zlib.h"
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#include "mozilla/Mutex.h"
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/******************************************************************************
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* nsCacheEntryDescriptor
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*******************************************************************************/
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class nsCacheEntryDescriptor final :
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public PRCList,
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public nsICacheEntryDescriptor
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSICACHEENTRYDESCRIPTOR
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NS_DECL_NSICACHEENTRYINFO
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friend class nsAsyncDoomEvent;
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friend class nsCacheService;
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nsCacheEntryDescriptor(nsCacheEntry * entry, nsCacheAccessMode mode);
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/**
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* utility method to attempt changing data size of associated entry
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*/
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nsresult RequestDataSizeChange(int32_t deltaSize);
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/**
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* methods callbacks for nsCacheService
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*/
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nsCacheEntry * CacheEntry(void) { return mCacheEntry; }
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bool ClearCacheEntry(void)
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{
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NS_ASSERTION(mInputWrappers.IsEmpty(), "Bad state");
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NS_ASSERTION(!mOutputWrapper, "Bad state");
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bool doomEntry = false;
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bool asyncDoomPending;
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{
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mozilla::MutexAutoLock lock(mLock);
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asyncDoomPending = mAsyncDoomPending;
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}
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if (asyncDoomPending && mCacheEntry) {
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doomEntry = true;
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mDoomedOnClose = true;
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}
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mCacheEntry = nullptr;
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return doomEntry;
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}
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private:
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virtual ~nsCacheEntryDescriptor();
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/*************************************************************************
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* input stream wrapper class -
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*
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* The input stream wrapper references the descriptor, but the descriptor
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* doesn't need any references to the stream wrapper.
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*************************************************************************/
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class nsInputStreamWrapper : public nsIInputStream {
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friend class nsCacheEntryDescriptor;
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private:
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nsCacheEntryDescriptor * mDescriptor;
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nsCOMPtr<nsIInputStream> mInput;
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uint32_t mStartOffset;
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bool mInitialized;
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mozilla::Mutex mLock;
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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nsInputStreamWrapper(nsCacheEntryDescriptor * desc, uint32_t off)
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: mDescriptor(desc)
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, mStartOffset(off)
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, mInitialized(false)
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, mLock("nsInputStreamWrapper.mLock")
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{
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NS_ADDREF(mDescriptor);
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}
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private:
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virtual ~nsInputStreamWrapper()
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{
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NS_IF_RELEASE(mDescriptor);
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}
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nsresult LazyInit();
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nsresult EnsureInit();
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nsresult Read_Locked(char *buf, uint32_t count, uint32_t *countRead);
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nsresult Close_Locked();
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void CloseInternal();
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};
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class nsDecompressInputStreamWrapper : public nsInputStreamWrapper {
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private:
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unsigned char* mReadBuffer;
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uint32_t mReadBufferLen;
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z_stream mZstream;
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bool mStreamInitialized;
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bool mStreamEnded;
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public:
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NS_DECL_ISUPPORTS_INHERITED
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nsDecompressInputStreamWrapper(nsCacheEntryDescriptor * desc,
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uint32_t off)
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: nsInputStreamWrapper(desc, off)
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, mReadBuffer(0)
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, mReadBufferLen(0)
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, mStreamInitialized(false)
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, mStreamEnded(false)
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{
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}
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NS_IMETHOD Read(char* buf, uint32_t count, uint32_t * result) override;
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NS_IMETHOD Close() override;
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private:
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virtual ~nsDecompressInputStreamWrapper()
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{
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Close();
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}
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nsresult InitZstream();
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nsresult EndZstream();
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};
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/*************************************************************************
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* output stream wrapper class -
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*
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* The output stream wrapper references the descriptor, but the descriptor
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* doesn't need any references to the stream wrapper.
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*************************************************************************/
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class nsOutputStreamWrapper : public nsIOutputStream {
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friend class nsCacheEntryDescriptor;
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protected:
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nsCacheEntryDescriptor * mDescriptor;
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nsCOMPtr<nsIOutputStream> mOutput;
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uint32_t mStartOffset;
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bool mInitialized;
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mozilla::Mutex mLock;
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIOUTPUTSTREAM
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nsOutputStreamWrapper(nsCacheEntryDescriptor * desc, uint32_t off)
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: mDescriptor(desc)
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, mStartOffset(off)
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, mInitialized(false)
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, mLock("nsOutputStreamWrapper.mLock")
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{
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NS_ADDREF(mDescriptor); // owning ref
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}
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private:
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virtual ~nsOutputStreamWrapper()
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{
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Close();
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NS_ASSERTION(!mOutput, "Bad state");
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NS_ASSERTION(!mDescriptor, "Bad state");
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}
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nsresult LazyInit();
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nsresult EnsureInit();
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nsresult OnWrite(uint32_t count);
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nsresult Write_Locked(const char * buf,
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uint32_t count,
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uint32_t * result);
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nsresult Close_Locked();
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void CloseInternal();
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};
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class nsCompressOutputStreamWrapper : public nsOutputStreamWrapper {
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private:
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unsigned char* mWriteBuffer;
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uint32_t mWriteBufferLen;
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z_stream mZstream;
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bool mStreamInitialized;
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bool mStreamEnded;
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uint32_t mUncompressedCount;
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public:
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NS_DECL_ISUPPORTS_INHERITED
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nsCompressOutputStreamWrapper(nsCacheEntryDescriptor * desc,
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uint32_t off)
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: nsOutputStreamWrapper(desc, off)
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, mWriteBuffer(0)
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, mWriteBufferLen(0)
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, mStreamInitialized(false)
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, mStreamEnded(false)
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, mUncompressedCount(0)
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{
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}
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NS_IMETHOD Write(const char* buf, uint32_t count, uint32_t * result) override;
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NS_IMETHOD Close() override;
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private:
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virtual ~nsCompressOutputStreamWrapper()
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{
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Close();
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}
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nsresult InitZstream();
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nsresult WriteBuffer();
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};
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private:
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/**
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* nsCacheEntryDescriptor data members
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*/
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nsCacheEntry * mCacheEntry; // we are a child of the entry
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nsCacheAccessMode mAccessGranted;
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nsTArray<nsInputStreamWrapper*> mInputWrappers;
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nsOutputStreamWrapper * mOutputWrapper;
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mozilla::Mutex mLock;
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bool mAsyncDoomPending;
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bool mDoomedOnClose;
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bool mClosingDescriptor;
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};
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#endif // _nsCacheEntryDescriptor_h_
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