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-rw-r--r--xpcom/io/FixedBufferOutputStream.cpp161
1 files changed, 161 insertions, 0 deletions
diff --git a/xpcom/io/FixedBufferOutputStream.cpp b/xpcom/io/FixedBufferOutputStream.cpp
new file mode 100644
index 0000000000..1c841bb91f
--- /dev/null
+++ b/xpcom/io/FixedBufferOutputStream.cpp
@@ -0,0 +1,161 @@
+/* -*- 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 "FixedBufferOutputStream.h"
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/StreamBufferSinkImpl.h"
+#include "nsStreamUtils.h"
+#include "nsString.h"
+
+namespace mozilla {
+
+FixedBufferOutputStream::FixedBufferOutputStream(
+ UniquePtr<StreamBufferSink>&& aSink)
+ : mSink(std::move(aSink)),
+ mMutex("FixedBufferOutputStream::mMutex"),
+ mOffset(0),
+ mWriting(false),
+ mClosed(false) {}
+
+// static
+RefPtr<FixedBufferOutputStream> FixedBufferOutputStream::Create(
+ size_t aLength) {
+ MOZ_ASSERT(aLength);
+
+ return MakeRefPtr<FixedBufferOutputStream>(MakeUnique<BufferSink>(aLength));
+}
+
+// static
+RefPtr<FixedBufferOutputStream> FixedBufferOutputStream::Create(
+ size_t aLength, const mozilla::fallible_t&) {
+ MOZ_ASSERT(aLength);
+
+ auto sink = BufferSink::Alloc(aLength);
+
+ if (NS_WARN_IF(!sink)) {
+ return nullptr;
+ }
+
+ return MakeRefPtr<FixedBufferOutputStream>(std::move(sink));
+}
+
+// static
+RefPtr<FixedBufferOutputStream> FixedBufferOutputStream::Create(
+ mozilla::Span<char> aBuffer) {
+ return MakeRefPtr<FixedBufferOutputStream>(
+ MakeUnique<nsBorrowedSink>(aBuffer));
+}
+
+// static
+RefPtr<FixedBufferOutputStream> FixedBufferOutputStream::Create(
+ UniquePtr<StreamBufferSink>&& aSink) {
+ return MakeRefPtr<FixedBufferOutputStream>(std::move(aSink));
+}
+
+nsDependentCSubstring FixedBufferOutputStream::WrittenData() {
+ MutexAutoLock autoLock(mMutex);
+
+ return mSink->Slice(mOffset);
+}
+
+NS_IMPL_ISUPPORTS(FixedBufferOutputStream, nsIOutputStream)
+
+NS_IMETHODIMP
+FixedBufferOutputStream::Close() {
+ MutexAutoLock autoLock(mMutex);
+
+ if (mWriting) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ mClosed = true;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+FixedBufferOutputStream::Flush() { return NS_OK; }
+
+NS_IMETHODIMP
+FixedBufferOutputStream::StreamStatus() {
+ MutexAutoLock autoLock(mMutex);
+ return mClosed ? NS_BASE_STREAM_CLOSED : NS_OK;
+}
+
+NS_IMETHODIMP
+FixedBufferOutputStream::Write(const char* aBuf, uint32_t aCount,
+ uint32_t* _retval) {
+ return WriteSegments(NS_CopyBufferToSegment, const_cast<char*>(aBuf), aCount,
+ _retval);
+}
+
+NS_IMETHODIMP
+FixedBufferOutputStream::WriteFrom(nsIInputStream* aFromStream, uint32_t aCount,
+ uint32_t* _retval) {
+ return WriteSegments(NS_CopyStreamToSegment, aFromStream, aCount, _retval);
+}
+
+NS_IMETHODIMP
+FixedBufferOutputStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
+ uint32_t aCount, uint32_t* _retval) {
+ MOZ_ASSERT(_retval);
+
+ MutexAutoLock autoLock(mMutex);
+
+ if (mWriting) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ if (mClosed) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ size_t length = mSink->Data().Length();
+ size_t offset = mOffset;
+
+ MOZ_ASSERT(length >= offset, "Bad stream state!");
+
+ size_t maxCount = length - offset;
+ if (maxCount == 0) {
+ *_retval = 0;
+ return NS_OK;
+ }
+
+ if (aCount > maxCount) {
+ aCount = maxCount;
+ }
+
+ mWriting = true;
+
+ nsresult rv;
+
+ {
+ MutexAutoUnlock autoUnlock(mMutex);
+
+ rv = aReader(this, aClosure, mSink->Data().Elements() + offset, 0, aCount,
+ _retval);
+ }
+
+ mWriting = false;
+
+ if (NS_SUCCEEDED(rv)) {
+ MOZ_ASSERT(*_retval <= aCount,
+ "Reader should not read more than we asked it to read!");
+ mOffset += *_retval;
+ }
+
+ // As defined in nsIOutputStream.idl, do not pass reader func errors.
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+FixedBufferOutputStream::IsNonBlocking(bool* _retval) {
+ *_retval = true;
+ return NS_OK;
+}
+
+} // namespace mozilla