101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/devtools/ZeroCopyNSIOutputStream.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/Unused.h"
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namespace mozilla {
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namespace devtools {
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ZeroCopyNSIOutputStream::ZeroCopyNSIOutputStream(nsCOMPtr<nsIOutputStream>& out)
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: out(out)
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, result_(NS_OK)
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, amountUsed(0)
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, writtenCount(0)
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{
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DebugOnly<bool> nonBlocking = false;
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MOZ_ASSERT(out->IsNonBlocking(&nonBlocking) == NS_OK);
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MOZ_ASSERT(!nonBlocking);
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}
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ZeroCopyNSIOutputStream::~ZeroCopyNSIOutputStream()
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{
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if (!failed())
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Unused << NS_WARN_IF(NS_FAILED(writeBuffer()));
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}
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nsresult
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ZeroCopyNSIOutputStream::writeBuffer()
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{
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if (failed())
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return result_;
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if (amountUsed == 0)
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return NS_OK;
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int32_t amountWritten = 0;
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while (amountWritten < amountUsed) {
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uint32_t justWritten = 0;
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result_ = out->Write(buffer + amountWritten,
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amountUsed - amountWritten,
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&justWritten);
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if (NS_WARN_IF(NS_FAILED(result_)))
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return result_;
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amountWritten += justWritten;
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}
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writtenCount += amountUsed;
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amountUsed = 0;
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return NS_OK;
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}
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// ZeroCopyOutputStream Interface
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bool
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ZeroCopyNSIOutputStream::Next(void** data, int* size)
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{
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MOZ_ASSERT(data != nullptr);
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MOZ_ASSERT(size != nullptr);
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if (failed())
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return false;
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if (amountUsed == BUFFER_SIZE) {
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if (NS_FAILED(writeBuffer()))
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return false;
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}
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*data = buffer + amountUsed;
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*size = BUFFER_SIZE - amountUsed;
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amountUsed = BUFFER_SIZE;
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return true;
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}
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void
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ZeroCopyNSIOutputStream::BackUp(int count)
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{
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MOZ_ASSERT(count >= 0,
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"Cannot back up a negative amount of bytes.");
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MOZ_ASSERT(amountUsed == BUFFER_SIZE,
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"Can only call BackUp directly after calling Next.");
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MOZ_ASSERT(count <= amountUsed,
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"Can't back up further than we've given out.");
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amountUsed -= count;
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}
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::google::protobuf::int64
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ZeroCopyNSIOutputStream::ByteCount() const
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{
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return writtenCount + amountUsed;
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}
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} // namespace devtools
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} // namespace mozilla
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