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