1 files changed, 87 insertions, 0 deletions
diff --git a/toolkit/components/url-classifier/nsCheckSummedOutputStream.cpp b/toolkit/components/url-classifier/nsCheckSummedOutputStream.cpp
new file mode 100644
index 0000000000..472dd71390
--- /dev/null
+++ b/toolkit/components/url-classifier/nsCheckSummedOutputStream.cpp
@@ -0,0 +1,87 @@
+//* -*- Mode: C++; tab-width: 8; 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 "nsCRT.h"
+#include "nsComponentManagerUtils.h"
+#include "nsISupportsImpl.h"
+#include "nsCheckSummedOutputStream.h"
+#include "crc32c.h"
+
+////////////////////////////////////////////////////////////////////////////////
+// nsCheckSummedOutputStream
+
+NS_IMPL_ISUPPORTS_INHERITED(nsCheckSummedOutputStream, nsBufferedOutputStream,
+                            nsISafeOutputStream)
+
+NS_IMETHODIMP
+nsCheckSummedOutputStream::Init(nsIOutputStream* stream, uint32_t bufferSize) {
+  nsresult rv;
+  mHash = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = mHash->Init(nsICryptoHash::MD5);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return nsBufferedOutputStream::Init(stream, bufferSize);
+}
+
+NS_IMETHODIMP
+nsCheckSummedOutputStream::Finish() {
+  nsresult rv = mHash->Finish(false, mCheckSum);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t written;
+  rv = nsBufferedOutputStream::Write(
+      reinterpret_cast<const char*>(mCheckSum.BeginReading()),
+      mCheckSum.Length(), &written);
+  NS_ASSERTION(written == mCheckSum.Length(), "Error writing stream checksum");
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return nsBufferedOutputStream::Finish();
+}
+
+NS_IMETHODIMP
+nsCheckSummedOutputStream::Write(const char* buf, uint32_t count,
+                                 uint32_t* result) {
+  nsresult rv = mHash->Update(reinterpret_cast<const uint8_t*>(buf), count);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return nsBufferedOutputStream::Write(buf, count, result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsCrc32CheckSumedOutputStream
+NS_IMPL_ISUPPORTS_INHERITED(nsCrc32CheckSumedOutputStream,
+                            nsBufferedOutputStream, nsISafeOutputStream)
+
+NS_IMETHODIMP
+nsCrc32CheckSumedOutputStream::Init(nsIOutputStream* stream,
+                                    uint32_t bufferSize) {
+  mCheckSum = ~0;
+
+  return nsBufferedOutputStream::Init(stream, bufferSize);
+}
+
+NS_IMETHODIMP
+nsCrc32CheckSumedOutputStream::Finish() {
+  uint32_t written;
+  nsresult rv = nsBufferedOutputStream::Write(
+      reinterpret_cast<const char*>(&mCheckSum), sizeof(mCheckSum), &written);
+  NS_ASSERTION(written == sizeof(mCheckSum), "Error writing stream checksum");
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return nsBufferedOutputStream::Finish();
+}
+
+NS_IMETHODIMP
+nsCrc32CheckSumedOutputStream::Write(const char* buf, uint32_t count,
+                                     uint32_t* result) {
+  mCheckSum =
+      ComputeCrc32c(mCheckSum, reinterpret_cast<const uint8_t*>(buf), count);
+
+  return nsBufferedOutputStream::Write(buf, count, result);
+}
+
+////////////////////////////////////////////////////////////////////////////////