154 lines
3.6 KiB
C++
154 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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#include "nsPreloadedStream.h"
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#include "nsIRunnable.h"
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#include "nsThreadUtils.h"
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#include <algorithm>
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namespace mozilla {
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namespace net {
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NS_IMPL_ISUPPORTS(nsPreloadedStream,
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nsIInputStream,
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nsIAsyncInputStream)
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nsPreloadedStream::nsPreloadedStream(nsIAsyncInputStream *aStream,
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const char *data, uint32_t datalen)
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: mStream(aStream),
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mOffset(0),
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mLen(datalen)
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{
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mBuf = (char *) moz_xmalloc(datalen);
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memcpy(mBuf, data, datalen);
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}
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nsPreloadedStream::~nsPreloadedStream()
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{
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free(mBuf);
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}
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NS_IMETHODIMP
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nsPreloadedStream::Close()
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{
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mLen = 0;
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return mStream->Close();
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}
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NS_IMETHODIMP
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nsPreloadedStream::Available(uint64_t *_retval)
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{
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uint64_t avail = 0;
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nsresult rv = mStream->Available(&avail);
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if (NS_FAILED(rv))
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return rv;
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*_retval = avail + mLen;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPreloadedStream::Read(char *aBuf, uint32_t aCount,
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uint32_t *_retval)
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{
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if (!mLen)
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return mStream->Read(aBuf, aCount, _retval);
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uint32_t toRead = std::min(mLen, aCount);
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memcpy(aBuf, mBuf + mOffset, toRead);
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mOffset += toRead;
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mLen -= toRead;
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*_retval = toRead;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPreloadedStream::ReadSegments(nsWriteSegmentFun aWriter,
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void *aClosure, uint32_t aCount,
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uint32_t *result)
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{
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if (!mLen)
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return mStream->ReadSegments(aWriter, aClosure, aCount, result);
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*result = 0;
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while (mLen > 0 && aCount > 0) {
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uint32_t toRead = std::min(mLen, aCount);
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uint32_t didRead = 0;
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nsresult rv;
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rv = aWriter(this, aClosure, mBuf + mOffset, *result, toRead, &didRead);
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if (NS_FAILED(rv))
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return NS_OK;
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*result += didRead;
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mOffset += didRead;
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mLen -= didRead;
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aCount -= didRead;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPreloadedStream::IsNonBlocking(bool *_retval)
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{
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return mStream->IsNonBlocking(_retval);
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}
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NS_IMETHODIMP
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nsPreloadedStream::CloseWithStatus(nsresult aStatus)
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{
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mLen = 0;
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return mStream->CloseWithStatus(aStatus);
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}
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class RunOnThread : public nsRunnable
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{
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public:
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RunOnThread(nsIAsyncInputStream *aStream,
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nsIInputStreamCallback *aCallback)
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: mStream(aStream),
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mCallback(aCallback) {}
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virtual ~RunOnThread() {}
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NS_IMETHOD Run()
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{
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mCallback->OnInputStreamReady(mStream);
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return NS_OK;
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}
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private:
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nsCOMPtr<nsIAsyncInputStream> mStream;
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nsCOMPtr<nsIInputStreamCallback> mCallback;
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};
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NS_IMETHODIMP
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nsPreloadedStream::AsyncWait(nsIInputStreamCallback *aCallback,
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uint32_t aFlags,
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uint32_t aRequestedCount,
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nsIEventTarget *aEventTarget)
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{
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if (!mLen)
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return mStream->AsyncWait(aCallback, aFlags, aRequestedCount,
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aEventTarget);
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if (!aCallback)
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return NS_OK;
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if (!aEventTarget)
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return aCallback->OnInputStreamReady(this);
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nsCOMPtr<nsIRunnable> event =
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new RunOnThread(this, aCallback);
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return aEventTarget->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL);
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}
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} // namespace net
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} // namespace mozilla
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