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-rw-r--r--xpcom/io/SlicedInputStream.cpp668
1 files changed, 668 insertions, 0 deletions
diff --git a/xpcom/io/SlicedInputStream.cpp b/xpcom/io/SlicedInputStream.cpp
new file mode 100644
index 0000000000..0b45f67b0e
--- /dev/null
+++ b/xpcom/io/SlicedInputStream.cpp
@@ -0,0 +1,668 @@
+/* -*- 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/. */
+
+#include "SlicedInputStream.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/ScopeExit.h"
+#include "nsISeekableStream.h"
+#include "nsStreamUtils.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+NS_IMPL_ADDREF(SlicedInputStream);
+NS_IMPL_RELEASE(SlicedInputStream);
+
+NS_INTERFACE_MAP_BEGIN(SlicedInputStream)
+ NS_INTERFACE_MAP_ENTRY(nsIInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICloneableInputStream,
+ mWeakCloneableInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(
+ nsIIPCSerializableInputStream,
+ mWeakIPCSerializableInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISeekableStream,
+ mWeakSeekableInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsITellableStream,
+ mWeakTellableInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStream,
+ mWeakAsyncInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamCallback,
+ mWeakAsyncInputStream || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamLength,
+ mWeakInputStreamLength || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(
+ nsIAsyncInputStreamLength, mWeakAsyncInputStreamLength || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(
+ nsIInputStreamLengthCallback,
+ mWeakAsyncInputStreamLength || !mInputStream)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStream)
+NS_INTERFACE_MAP_END
+
+SlicedInputStream::SlicedInputStream(
+ already_AddRefed<nsIInputStream> aInputStream, uint64_t aStart,
+ uint64_t aLength)
+ : mWeakCloneableInputStream(nullptr),
+ mWeakIPCSerializableInputStream(nullptr),
+ mWeakSeekableInputStream(nullptr),
+ mWeakTellableInputStream(nullptr),
+ mWeakAsyncInputStream(nullptr),
+ mWeakInputStreamLength(nullptr),
+ mWeakAsyncInputStreamLength(nullptr),
+ mStart(aStart),
+ mLength(aLength),
+ mCurPos(0),
+ mClosed(false),
+ mAsyncWaitFlags(0),
+ mAsyncWaitRequestedCount(0),
+ mMutex("SlicedInputStream::mMutex") {
+ nsCOMPtr<nsIInputStream> inputStream = std::move(aInputStream);
+ SetSourceStream(inputStream.forget());
+}
+
+SlicedInputStream::SlicedInputStream()
+ : mWeakCloneableInputStream(nullptr),
+ mWeakIPCSerializableInputStream(nullptr),
+ mWeakSeekableInputStream(nullptr),
+ mWeakTellableInputStream(nullptr),
+ mWeakAsyncInputStream(nullptr),
+ mWeakInputStreamLength(nullptr),
+ mWeakAsyncInputStreamLength(nullptr),
+ mStart(0),
+ mLength(0),
+ mCurPos(0),
+ mClosed(false),
+ mAsyncWaitFlags(0),
+ mAsyncWaitRequestedCount(0),
+ mMutex("SlicedInputStream::mMutex") {}
+
+SlicedInputStream::~SlicedInputStream() = default;
+
+void SlicedInputStream::SetSourceStream(
+ already_AddRefed<nsIInputStream> aInputStream) {
+ MOZ_ASSERT(!mInputStream);
+
+ mInputStream = std::move(aInputStream);
+
+ nsCOMPtr<nsICloneableInputStream> cloneableStream =
+ do_QueryInterface(mInputStream);
+ if (cloneableStream && SameCOMIdentity(mInputStream, cloneableStream)) {
+ mWeakCloneableInputStream = cloneableStream;
+ }
+
+ nsCOMPtr<nsIIPCSerializableInputStream> serializableStream =
+ do_QueryInterface(mInputStream);
+ if (serializableStream && SameCOMIdentity(mInputStream, serializableStream)) {
+ mWeakIPCSerializableInputStream = serializableStream;
+ }
+
+ nsCOMPtr<nsISeekableStream> seekableStream = do_QueryInterface(mInputStream);
+ if (seekableStream && SameCOMIdentity(mInputStream, seekableStream)) {
+ mWeakSeekableInputStream = seekableStream;
+ }
+
+ nsCOMPtr<nsITellableStream> tellableStream = do_QueryInterface(mInputStream);
+ if (tellableStream && SameCOMIdentity(mInputStream, tellableStream)) {
+ mWeakTellableInputStream = tellableStream;
+ }
+
+ nsCOMPtr<nsIAsyncInputStream> asyncInputStream =
+ do_QueryInterface(mInputStream);
+ if (asyncInputStream && SameCOMIdentity(mInputStream, asyncInputStream)) {
+ mWeakAsyncInputStream = asyncInputStream;
+ }
+
+ nsCOMPtr<nsIInputStreamLength> streamLength = do_QueryInterface(mInputStream);
+ if (streamLength && SameCOMIdentity(mInputStream, streamLength)) {
+ mWeakInputStreamLength = streamLength;
+ }
+
+ nsCOMPtr<nsIAsyncInputStreamLength> asyncStreamLength =
+ do_QueryInterface(mInputStream);
+ if (asyncStreamLength && SameCOMIdentity(mInputStream, asyncStreamLength)) {
+ mWeakAsyncInputStreamLength = asyncStreamLength;
+ }
+}
+
+uint64_t SlicedInputStream::AdjustRange(uint64_t aRange) {
+ CheckedUint64 range(aRange);
+ range += mCurPos;
+
+ // Let's remove extra length from the end.
+ if (range.isValid() && range.value() > mStart + mLength) {
+ aRange -= XPCOM_MIN((uint64_t)aRange, range.value() - (mStart + mLength));
+ }
+
+ // Let's remove extra length from the begin.
+ if (mCurPos < mStart) {
+ aRange -= XPCOM_MIN((uint64_t)aRange, mStart - mCurPos);
+ }
+
+ return aRange;
+}
+
+// nsIInputStream interface
+
+NS_IMETHODIMP
+SlicedInputStream::Close() {
+ NS_ENSURE_STATE(mInputStream);
+
+ mClosed = true;
+ return mInputStream->Close();
+}
+
+NS_IMETHODIMP
+SlicedInputStream::Available(uint64_t* aLength) {
+ NS_ENSURE_STATE(mInputStream);
+
+ if (mClosed) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ nsresult rv = mInputStream->Available(aLength);
+ if (rv == NS_BASE_STREAM_CLOSED) {
+ mClosed = true;
+ return rv;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ *aLength = AdjustRange(*aLength);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::StreamStatus() {
+ NS_ENSURE_STATE(mInputStream);
+
+ if (mClosed) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ nsresult rv = mInputStream->StreamStatus();
+ if (rv == NS_BASE_STREAM_CLOSED) {
+ mClosed = true;
+ }
+ return rv;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::Read(char* aBuffer, uint32_t aCount, uint32_t* aReadCount) {
+ *aReadCount = 0;
+
+ if (mClosed) {
+ return NS_OK;
+ }
+
+ if (mCurPos < mStart) {
+ nsCOMPtr<nsISeekableStream> seekableStream =
+ do_QueryInterface(mInputStream);
+ if (seekableStream) {
+ nsresult rv =
+ seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, mStart);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mCurPos = mStart;
+ } else {
+ char buf[4096];
+ while (mCurPos < mStart) {
+ uint32_t bytesRead;
+ uint64_t bufCount = XPCOM_MIN(mStart - mCurPos, (uint64_t)sizeof(buf));
+ nsresult rv = mInputStream->Read(buf, bufCount, &bytesRead);
+ if (NS_SUCCEEDED(rv) && bytesRead == 0) {
+ mClosed = true;
+ return rv;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mCurPos += bytesRead;
+ }
+ }
+ }
+
+ // Let's reduce aCount in case it's too big.
+ if (mCurPos + aCount > mStart + mLength) {
+ aCount = mStart + mLength - mCurPos;
+ }
+
+ // Nothing else to read.
+ if (!aCount) {
+ return NS_OK;
+ }
+
+ nsresult rv = mInputStream->Read(aBuffer, aCount, aReadCount);
+ if (NS_SUCCEEDED(rv) && *aReadCount == 0) {
+ mClosed = true;
+ return rv;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mCurPos += *aReadCount;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
+ uint32_t aCount, uint32_t* aResult) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::IsNonBlocking(bool* aNonBlocking) {
+ NS_ENSURE_STATE(mInputStream);
+ return mInputStream->IsNonBlocking(aNonBlocking);
+}
+
+// nsICloneableInputStream interface
+
+NS_IMETHODIMP
+SlicedInputStream::GetCloneable(bool* aCloneable) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakCloneableInputStream);
+
+ *aCloneable = true;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::Clone(nsIInputStream** aResult) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakCloneableInputStream);
+
+ nsCOMPtr<nsIInputStream> clonedStream;
+ nsresult rv = mWeakCloneableInputStream->Clone(getter_AddRefs(clonedStream));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ nsCOMPtr<nsIInputStream> sis =
+ new SlicedInputStream(clonedStream.forget(), mStart, mLength);
+
+ sis.forget(aResult);
+ return NS_OK;
+}
+
+// nsIAsyncInputStream interface
+
+NS_IMETHODIMP
+SlicedInputStream::CloseWithStatus(nsresult aStatus) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakAsyncInputStream);
+
+ mClosed = true;
+ return mWeakAsyncInputStream->CloseWithStatus(aStatus);
+}
+
+NS_IMETHODIMP
+SlicedInputStream::AsyncWait(nsIInputStreamCallback* aCallback, uint32_t aFlags,
+ uint32_t aRequestedCount,
+ nsIEventTarget* aEventTarget) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakAsyncInputStream);
+
+ nsCOMPtr<nsIInputStreamCallback> callback = aCallback ? this : nullptr;
+
+ uint32_t flags = aFlags;
+ uint32_t requestedCount = aRequestedCount;
+
+ {
+ MutexAutoLock lock(mMutex);
+
+ if (NS_WARN_IF(mAsyncWaitCallback && aCallback &&
+ mAsyncWaitCallback != aCallback)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ mAsyncWaitCallback = aCallback;
+
+ // If we haven't started retrieving data, let's see if we can seek.
+ // If we cannot seek, we will do consecutive reads.
+ if (mCurPos < mStart && mWeakSeekableInputStream) {
+ nsresult rv = mWeakSeekableInputStream->Seek(
+ nsISeekableStream::NS_SEEK_SET, mStart);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mCurPos = mStart;
+ }
+
+ mAsyncWaitFlags = aFlags;
+ mAsyncWaitRequestedCount = aRequestedCount;
+ mAsyncWaitEventTarget = aEventTarget;
+
+ // If we are not at the right position, let's do an asyncWait just internal.
+ if (mCurPos < mStart) {
+ flags = 0;
+ requestedCount = mStart - mCurPos;
+ }
+ }
+
+ return mWeakAsyncInputStream->AsyncWait(callback, flags, requestedCount,
+ aEventTarget);
+}
+
+// nsIInputStreamCallback
+
+NS_IMETHODIMP
+SlicedInputStream::OnInputStreamReady(nsIAsyncInputStream* aStream) {
+ MOZ_ASSERT(mInputStream);
+ MOZ_ASSERT(mWeakAsyncInputStream);
+ MOZ_ASSERT(mWeakAsyncInputStream == aStream);
+
+ nsCOMPtr<nsIInputStreamCallback> callback;
+ uint32_t asyncWaitFlags = 0;
+ uint32_t asyncWaitRequestedCount = 0;
+ nsCOMPtr<nsIEventTarget> asyncWaitEventTarget;
+
+ {
+ MutexAutoLock lock(mMutex);
+
+ // We have been canceled in the meanwhile.
+ if (!mAsyncWaitCallback) {
+ return NS_OK;
+ }
+
+ auto raii = MakeScopeExit([&] {
+ mMutex.AssertCurrentThreadOwns();
+ mAsyncWaitCallback = nullptr;
+ mAsyncWaitEventTarget = nullptr;
+ });
+
+ asyncWaitFlags = mAsyncWaitFlags;
+ asyncWaitRequestedCount = mAsyncWaitRequestedCount;
+ asyncWaitEventTarget = mAsyncWaitEventTarget;
+
+ // If at the end of this locked block, the callback is not null, it will be
+ // executed, otherwise, we are going to exec another AsyncWait().
+ callback = mAsyncWaitCallback;
+
+ if (mCurPos < mStart) {
+ char buf[4096];
+ nsresult rv = NS_OK;
+ while (mCurPos < mStart) {
+ uint32_t bytesRead;
+ uint64_t bufCount = XPCOM_MIN(mStart - mCurPos, (uint64_t)sizeof(buf));
+ rv = mInputStream->Read(buf, bufCount, &bytesRead);
+ if (NS_SUCCEEDED(rv) && bytesRead == 0) {
+ mClosed = true;
+ break;
+ }
+
+ if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+ asyncWaitFlags = 0;
+ asyncWaitRequestedCount = mStart - mCurPos;
+ // Here we want to exec another AsyncWait().
+ callback = nullptr;
+ break;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ break;
+ }
+
+ mCurPos += bytesRead;
+ }
+
+ // Now we are ready to do the 'real' asyncWait.
+ if (mCurPos >= mStart) {
+ // We don't want to nullify the callback now, because it will be needed
+ // at the next ::OnInputStreamReady.
+ raii.release();
+ callback = nullptr;
+ }
+ }
+ }
+
+ if (callback) {
+ return callback->OnInputStreamReady(this);
+ }
+
+ return mWeakAsyncInputStream->AsyncWait(
+ this, asyncWaitFlags, asyncWaitRequestedCount, asyncWaitEventTarget);
+}
+
+// nsIIPCSerializableInputStream
+
+void SlicedInputStream::SerializedComplexity(uint32_t aMaxSize,
+ uint32_t* aSizeUsed,
+ uint32_t* aPipes,
+ uint32_t* aTransferables) {
+ InputStreamHelper::SerializedComplexity(mInputStream, aMaxSize, aSizeUsed,
+ aPipes, aTransferables);
+
+ // If we're going to be serializing a pipe to transfer the sliced data, and we
+ // are getting no efficiency improvements from transferables, stream this
+ // sliced input stream directly as a pipe to avoid streaming data which will
+ // be sliced off anyway.
+ if (*aPipes > 0 && *aTransferables == 0) {
+ *aSizeUsed = 0;
+ *aPipes = 1;
+ *aTransferables = 0;
+ }
+}
+
+void SlicedInputStream::Serialize(mozilla::ipc::InputStreamParams& aParams,
+ uint32_t aMaxSize, uint32_t* aSizeUsed) {
+ MOZ_ASSERT(mInputStream);
+ MOZ_ASSERT(mWeakIPCSerializableInputStream);
+
+ uint32_t sizeUsed = 0, pipes = 0, transferables = 0;
+ SerializedComplexity(aMaxSize, &sizeUsed, &pipes, &transferables);
+ if (pipes > 0 && transferables == 0) {
+ InputStreamHelper::SerializeInputStreamAsPipe(mInputStream, aParams);
+ return;
+ }
+
+ SlicedInputStreamParams params;
+ InputStreamHelper::SerializeInputStream(mInputStream, params.stream(),
+ aMaxSize, aSizeUsed);
+ params.start() = mStart;
+ params.length() = mLength;
+ params.curPos() = mCurPos;
+ params.closed() = mClosed;
+
+ aParams = params;
+}
+
+bool SlicedInputStream::Deserialize(
+ const mozilla::ipc::InputStreamParams& aParams) {
+ MOZ_ASSERT(!mInputStream);
+ MOZ_ASSERT(!mWeakIPCSerializableInputStream);
+
+ if (aParams.type() != InputStreamParams::TSlicedInputStreamParams) {
+ NS_ERROR("Received unknown parameters from the other process!");
+ return false;
+ }
+
+ const SlicedInputStreamParams& params = aParams.get_SlicedInputStreamParams();
+
+ nsCOMPtr<nsIInputStream> stream =
+ InputStreamHelper::DeserializeInputStream(params.stream());
+ if (!stream) {
+ NS_WARNING("Deserialize failed!");
+ return false;
+ }
+
+ SetSourceStream(stream.forget());
+
+ mStart = params.start();
+ mLength = params.length();
+ mCurPos = params.curPos();
+ mClosed = params.closed();
+
+ return true;
+}
+
+// nsISeekableStream
+
+NS_IMETHODIMP
+SlicedInputStream::Seek(int32_t aWhence, int64_t aOffset) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakSeekableInputStream);
+
+ int64_t offset;
+ nsresult rv;
+
+ switch (aWhence) {
+ case NS_SEEK_SET:
+ offset = mStart + aOffset;
+ break;
+ case NS_SEEK_CUR:
+ // mCurPos could be lower than mStart if the reading has not started yet.
+ offset = XPCOM_MAX(mStart, mCurPos) + aOffset;
+ break;
+ case NS_SEEK_END: {
+ uint64_t available;
+ rv = mInputStream->Available(&available);
+ if (rv == NS_BASE_STREAM_CLOSED) {
+ mClosed = true;
+ return rv;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ offset = XPCOM_MIN(mStart + mLength, available) + aOffset;
+ break;
+ }
+ default:
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+
+ if (offset < (int64_t)mStart || offset > (int64_t)(mStart + mLength)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ rv = mWeakSeekableInputStream->Seek(NS_SEEK_SET, offset);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mCurPos = offset;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+SlicedInputStream::SetEOF() {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakSeekableInputStream);
+
+ mClosed = true;
+ return mWeakSeekableInputStream->SetEOF();
+}
+
+// nsITellableStream
+
+NS_IMETHODIMP
+SlicedInputStream::Tell(int64_t* aResult) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakTellableInputStream);
+
+ int64_t tell = 0;
+
+ nsresult rv = mWeakTellableInputStream->Tell(&tell);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ if (tell < (int64_t)mStart) {
+ *aResult = 0;
+ return NS_OK;
+ }
+
+ *aResult = tell - mStart;
+ if (*aResult > (int64_t)mLength) {
+ *aResult = mLength;
+ }
+
+ return NS_OK;
+}
+
+// nsIInputStreamLength
+
+NS_IMETHODIMP
+SlicedInputStream::Length(int64_t* aLength) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakInputStreamLength);
+
+ nsresult rv = mWeakInputStreamLength->Length(aLength);
+ if (rv == NS_BASE_STREAM_CLOSED) {
+ mClosed = true;
+ return rv;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ if (*aLength == -1) {
+ return NS_OK;
+ }
+
+ *aLength = (int64_t)AdjustRange((uint64_t)*aLength);
+ return NS_OK;
+}
+
+// nsIAsyncInputStreamLength
+
+NS_IMETHODIMP
+SlicedInputStream::AsyncLengthWait(nsIInputStreamLengthCallback* aCallback,
+ nsIEventTarget* aEventTarget) {
+ NS_ENSURE_STATE(mInputStream);
+ NS_ENSURE_STATE(mWeakAsyncInputStreamLength);
+
+ nsCOMPtr<nsIInputStreamLengthCallback> callback = aCallback ? this : nullptr;
+ {
+ MutexAutoLock lock(mMutex);
+ mAsyncWaitLengthCallback = aCallback;
+ }
+
+ return mWeakAsyncInputStreamLength->AsyncLengthWait(callback, aEventTarget);
+}
+
+// nsIInputStreamLengthCallback
+
+NS_IMETHODIMP
+SlicedInputStream::OnInputStreamLengthReady(nsIAsyncInputStreamLength* aStream,
+ int64_t aLength) {
+ MOZ_ASSERT(mInputStream);
+ MOZ_ASSERT(mWeakAsyncInputStreamLength);
+ MOZ_ASSERT(mWeakAsyncInputStreamLength == aStream);
+
+ nsCOMPtr<nsIInputStreamLengthCallback> callback;
+ {
+ MutexAutoLock lock(mMutex);
+
+ // We have been canceled in the meanwhile.
+ if (!mAsyncWaitLengthCallback) {
+ return NS_OK;
+ }
+
+ callback.swap(mAsyncWaitLengthCallback);
+ }
+
+ if (aLength != -1) {
+ aLength = (int64_t)AdjustRange((uint64_t)aLength);
+ }
+
+ MOZ_ASSERT(callback);
+ return callback->OnInputStreamLengthReady(this, aLength);
+}
+
+} // namespace mozilla