mirror of
https://github.com/mozilla/gecko-dev.git
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99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MemoryStreams.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsDebug.h"
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#include "nsError.h"
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#include "nsStreamUtils.h"
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namespace mozilla {
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namespace dom {
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// static
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already_AddRefed<MemoryOutputStream>
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MemoryOutputStream::Create(uint64_t aSize)
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{
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NS_ASSERTION(aSize, "Passed zero size!");
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NS_ENSURE_TRUE(aSize <= UINT32_MAX, nullptr);
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nsRefPtr<MemoryOutputStream> stream = new MemoryOutputStream();
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char* dummy;
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uint32_t length = stream->mData.GetMutableData(&dummy, aSize, fallible);
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NS_ENSURE_TRUE(length == aSize, nullptr);
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return stream.forget();
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}
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NS_IMPL_ISUPPORTS(MemoryOutputStream, nsIOutputStream)
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NS_IMETHODIMP
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MemoryOutputStream::Close()
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{
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mData.Truncate(mOffset);
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return NS_OK;
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}
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NS_IMETHODIMP
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MemoryOutputStream::Write(const char* aBuf, uint32_t aCount, uint32_t* _retval)
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{
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return WriteSegments(NS_CopySegmentToBuffer, (char*)aBuf, aCount, _retval);
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}
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NS_IMETHODIMP
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MemoryOutputStream::Flush()
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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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MemoryOutputStream::WriteFrom(nsIInputStream* aFromStream, uint32_t aCount,
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uint32_t* _retval)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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MemoryOutputStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
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uint32_t aCount, uint32_t* _retval)
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{
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NS_ASSERTION(mData.Length() >= mOffset, "Bad stream state!");
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uint32_t maxCount = mData.Length() - mOffset;
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if (maxCount == 0) {
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*_retval = 0;
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return NS_OK;
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}
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if (aCount > maxCount) {
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aCount = maxCount;
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}
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nsresult rv = aReader(this, aClosure, mData.BeginWriting() + mOffset, 0,
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aCount, _retval);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*_retval <= aCount,
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"Reader should not read more than we asked it to read!");
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mOffset += *_retval;
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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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MemoryOutputStream::IsNonBlocking(bool* _retval)
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{
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*_retval = false;
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return NS_OK;
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}
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} // namespace dom
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} // namespace mozilla
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