michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "MemoryStreams.h"
michael@0: 
michael@0: #include "nsStreamUtils.h"
michael@0: 
michael@0: USING_FILE_NAMESPACE
michael@0: 
michael@0: // static
michael@0: already_AddRefed<MemoryOutputStream>
michael@0: MemoryOutputStream::Create(uint64_t aSize)
michael@0: {
michael@0:   NS_ASSERTION(aSize, "Passed zero size!");
michael@0: 
michael@0:   NS_ENSURE_TRUE(aSize <= UINT32_MAX, nullptr);
michael@0: 
michael@0:   nsRefPtr<MemoryOutputStream> stream = new MemoryOutputStream();
michael@0: 
michael@0:   char* dummy;
michael@0:   uint32_t length = stream->mData.GetMutableData(&dummy, aSize, fallible_t());
michael@0:   NS_ENSURE_TRUE(length == aSize, nullptr);
michael@0: 
michael@0:   return stream.forget();
michael@0: }
michael@0: 
michael@0: NS_IMPL_ISUPPORTS(MemoryOutputStream, nsIOutputStream)
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::Close()
michael@0: {
michael@0:   mData.Truncate(mOffset);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::Write(const char* aBuf, uint32_t aCount, uint32_t* _retval)
michael@0: {
michael@0:   return WriteSegments(NS_CopySegmentToBuffer, (char*)aBuf, aCount, _retval);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::Flush()
michael@0: {
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::WriteFrom(nsIInputStream* aFromStream, uint32_t aCount,
michael@0:                               uint32_t* _retval)
michael@0: {
michael@0:   return NS_ERROR_NOT_IMPLEMENTED;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
michael@0:                                   uint32_t aCount, uint32_t* _retval)
michael@0: {
michael@0:   NS_ASSERTION(mData.Length() >= mOffset, "Bad stream state!");
michael@0: 
michael@0:   uint32_t maxCount = mData.Length() - mOffset;
michael@0:   if (maxCount == 0) {
michael@0:     *_retval = 0;
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (aCount > maxCount) {
michael@0:     aCount = maxCount;
michael@0:   }
michael@0: 
michael@0:   nsresult rv = aReader(this, aClosure, mData.BeginWriting() + mOffset, 0,
michael@0:                         aCount, _retval);
michael@0:   if (NS_SUCCEEDED(rv)) {
michael@0:     NS_ASSERTION(*_retval <= aCount,
michael@0:                  "Reader should not read more than we asked it to read!");
michael@0:     mOffset += *_retval;
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: MemoryOutputStream::IsNonBlocking(bool* _retval)
michael@0: {
michael@0:   *_retval = false;
michael@0:   return NS_OK;
michael@0: }