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