diff -r 000000000000 -r 6474c204b198 xpcom/tests/CvtURL.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/tests/CvtURL.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,91 @@
+/* -*- 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 <stdio.h>
+#include "nscore.h"
+#include "nsIConverterInputStream.h"
+#include "nsIURL.h"
+#include "nsNetUtil.h"
+#include "nsCRT.h"
+#include "nsString.h"
+#include "prprf.h"
+#include "prtime.h"
+
+static nsString* ConvertCharacterSetName(const char* aName)
+{
+  return new nsString(NS_ConvertASCIItoUTF16(aName));
+}
+
+int main(int argc, char** argv)
+{
+  if (3 != argc) {
+    printf("usage: CvtURL url utf8\n");
+    return -1;
+  }
+
+  char* characterSetName = argv[2];
+  nsString* cset = ConvertCharacterSetName(characterSetName);
+  if (NS_PTR_TO_INT32(cset) < 0) {
+    printf("illegal character set name: '%s'\n", characterSetName);
+    return -1;
+  }
+
+  // Create url object
+  char* urlName = argv[1];
+  nsIURI* url;
+  nsresult rv;
+  rv = NS_NewURI(&url, urlName);
+  if (NS_OK != rv) {
+    printf("invalid URL: '%s'\n", urlName);
+    return -1;
+  }
+
+  // Get an input stream from the url
+  nsresult ec;
+  nsIInputStream* in;
+  ec = NS_OpenURI(&in, url);
+  if (nullptr == in) {
+    printf("open of url('%s') failed: error=%x\n", urlName, ec);
+    return -1;
+  }
+
+  // Translate the input using the argument character set id into
+  // unicode
+  nsCOMPtr<nsIConverterInputStream> uin =
+    do_CreateInstance("@mozilla.org/intl/converter-input-stream;1", &rv);
+  if (NS_SUCCEEDED(rv))
+    rv = uin->Init(in, cset->get(), 4096);
+  if (NS_FAILED(rv)) {
+    printf("can't create converter input stream: %d\n", rv);
+    return -1;
+  }
+
+  // Read the input and write some output
+  PRTime start = PR_Now();
+  int32_t count = 0;
+  for (;;) {
+    char16_t buf[1000];
+    uint32_t nb;
+    ec = uin->Read(buf, 0, 1000, &nb);
+    if (NS_FAILED(ec)) {
+      printf("i/o error: %d\n", ec);
+      break;
+    }
+    if (nb == 0) break; // EOF
+    count += nb;
+  }
+  PRTime end = PR_Now();
+  PRTime conversion = (end - start) / 1000;
+  char buf[500];
+  PR_snprintf(buf, sizeof(buf),
+              "converting and discarding %d bytes took %lldms",
+              count, conversion);
+  puts(buf);
+
+  // Release the objects
+  in->Release();
+  url->Release();
+
+  return 0;
+}