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