1 files changed, 76 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/FileDescriptorOutputStream.cpp b/devtools/shared/heapsnapshot/FileDescriptorOutputStream.cpp
new file mode 100644
index 0000000000..a3d487db17
--- /dev/null
+++ b/devtools/shared/heapsnapshot/FileDescriptorOutputStream.cpp
@@ -0,0 +1,76 @@
+/* -*- 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/FileDescriptorOutputStream.h"
+#include "private/pprio.h"
+
+namespace mozilla {
+namespace devtools {
+
+/* static */
+already_AddRefed<FileDescriptorOutputStream> FileDescriptorOutputStream::Create(
+    const ipc::FileDescriptor& fileDescriptor) {
+  if (NS_WARN_IF(!fileDescriptor.IsValid())) return nullptr;
+
+  auto rawFD = fileDescriptor.ClonePlatformHandle();
+  PRFileDesc* prfd = PR_ImportFile(PROsfd(rawFD.release()));
+  if (NS_WARN_IF(!prfd)) return nullptr;
+
+  RefPtr<FileDescriptorOutputStream> stream =
+      new FileDescriptorOutputStream(prfd);
+  return stream.forget();
+}
+
+NS_IMPL_ISUPPORTS(FileDescriptorOutputStream, nsIOutputStream);
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::Close() {
+  // Repeatedly closing is idempotent.
+  if (!fd) return NS_OK;
+
+  if (PR_Close(fd) != PR_SUCCESS) return NS_ERROR_FAILURE;
+  fd = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::Write(const char* buf, uint32_t count,
+                                  uint32_t* retval) {
+  if (NS_WARN_IF(!fd)) return NS_ERROR_FAILURE;
+
+  auto written = PR_Write(fd, buf, count);
+  if (written < 0) return NS_ERROR_FAILURE;
+  *retval = written;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::Flush() {
+  if (NS_WARN_IF(!fd)) return NS_ERROR_FAILURE;
+
+  return PR_Sync(fd) == PR_SUCCESS ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::WriteFrom(nsIInputStream* fromStream,
+                                      uint32_t count, uint32_t* retval) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::WriteSegments(nsReadSegmentFun reader,
+                                          void* closure, uint32_t count,
+                                          uint32_t* retval) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+FileDescriptorOutputStream::IsNonBlocking(bool* retval) {
+  *retval = false;
+  return NS_OK;
+}
+
+}  // namespace devtools
+}  // namespace mozilla