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/* -*- 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/. */
#ifndef SlicedInputStream_h
#define SlicedInputStream_h
#include "mozilla/Attributes.h"
#include "mozilla/Mutex.h"
#include "nsCOMPtr.h"
#include "nsIAsyncInputStream.h"
#include "nsICloneableInputStream.h"
#include "nsIIPCSerializableInputStream.h"
#include "nsISeekableStream.h"
#include "nsIInputStreamLength.h"
namespace mozilla {
// A wrapper for a slice of an underlying input stream.
class SlicedInputStream final : public nsIAsyncInputStream,
public nsICloneableInputStream,
public nsIIPCSerializableInputStream,
public nsISeekableStream,
public nsIInputStreamCallback,
public nsIInputStreamLength,
public nsIAsyncInputStreamLength,
public nsIInputStreamLengthCallback {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
NS_DECL_NSICLONEABLEINPUTSTREAM
NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
NS_DECL_NSISEEKABLESTREAM
NS_DECL_NSITELLABLESTREAM
NS_DECL_NSIINPUTSTREAMCALLBACK
NS_DECL_NSIINPUTSTREAMLENGTH
NS_DECL_NSIASYNCINPUTSTREAMLENGTH
NS_DECL_NSIINPUTSTREAMLENGTHCALLBACK
// Create an input stream whose data comes from a slice of aInputStream. The
// slice begins at aStart bytes beyond aInputStream's current position, and
// extends for a maximum of aLength bytes. If aInputStream contains fewer
// than aStart bytes, reading from SlicedInputStream returns no data. If
// aInputStream contains more than aStart bytes, but fewer than aStart +
// aLength bytes, reading from SlicedInputStream returns as many bytes as can
// be consumed from aInputStream after reading aLength bytes.
//
// aInputStream should not be read from after constructing a
// SlicedInputStream wrapper around it.
SlicedInputStream(already_AddRefed<nsIInputStream> aInputStream,
uint64_t aStart, uint64_t aLength);
// This CTOR is meant to be used just for IPC.
SlicedInputStream();
private:
~SlicedInputStream();
void SetSourceStream(already_AddRefed<nsIInputStream> aInputStream);
uint64_t AdjustRange(uint64_t aRange);
nsCOMPtr<nsIInputStream> mInputStream;
// Raw pointers because these are just QI of mInputStream.
nsICloneableInputStream* mWeakCloneableInputStream;
nsIIPCSerializableInputStream* mWeakIPCSerializableInputStream;
nsISeekableStream* mWeakSeekableInputStream;
nsITellableStream* mWeakTellableInputStream;
nsIAsyncInputStream* mWeakAsyncInputStream;
nsIInputStreamLength* mWeakInputStreamLength;
nsIAsyncInputStreamLength* mWeakAsyncInputStreamLength;
uint64_t mStart;
uint64_t mLength;
uint64_t mCurPos;
bool mClosed;
// These four are used for AsyncWait. They are protected by mutex because
// touched on multiple threads.
nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback MOZ_GUARDED_BY(mMutex);
nsCOMPtr<nsIEventTarget> mAsyncWaitEventTarget MOZ_GUARDED_BY(mMutex);
uint32_t mAsyncWaitFlags MOZ_GUARDED_BY(mMutex);
uint32_t mAsyncWaitRequestedCount MOZ_GUARDED_BY(mMutex);
// This is use for nsIAsyncInputStreamLength::AsyncWait.
// This is protected by mutex.
nsCOMPtr<nsIInputStreamLengthCallback> mAsyncWaitLengthCallback
MOZ_GUARDED_BY(mMutex);
Mutex mMutex;
};
} // namespace mozilla
#endif // SlicedInputStream_h
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