1 files changed, 120 insertions, 0 deletions
diff --git a/intl/uconv/nsUTF8ConverterService.cpp b/intl/uconv/nsUTF8ConverterService.cpp
new file mode 100644
index 000000000..0944dae02
--- /dev/null
+++ b/intl/uconv/nsUTF8ConverterService.cpp
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=4: 
+ */
+/* 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 "nsString.h"
+#include "nsUTF8ConverterService.h"
+#include "nsEscape.h"
+#include "nsIUnicodeDecoder.h"
+#include "mozilla/dom/EncodingUtils.h"
+#include "mozilla/UniquePtr.h"
+
+using mozilla::dom::EncodingUtils;
+
+NS_IMPL_ISUPPORTS(nsUTF8ConverterService, nsIUTF8ConverterService)
+
+static nsresult 
+ToUTF8(const nsACString &aString, const char *aCharset,
+       bool aAllowSubstitution, nsACString &aResult)
+{
+  nsresult rv;
+  if (!aCharset || !*aCharset)
+    return NS_ERROR_INVALID_ARG;
+
+  nsDependentCString label(aCharset);
+  nsAutoCString encoding;
+  if (!EncodingUtils::FindEncodingForLabelNoReplacement(label, encoding)) {
+    return NS_ERROR_UCONV_NOCONV;
+  }
+  nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder =
+    EncodingUtils::DecoderForEncoding(encoding);
+
+  if (!aAllowSubstitution)
+    unicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal);
+
+  int32_t srcLen = aString.Length();
+  int32_t dstLen;
+  const nsAFlatCString& inStr = PromiseFlatCString(aString);
+  rv = unicodeDecoder->GetMaxLength(inStr.get(), srcLen, &dstLen);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  auto ustr = mozilla::MakeUnique<char16_t[]>(dstLen);
+  NS_ENSURE_TRUE(ustr, NS_ERROR_OUT_OF_MEMORY);
+
+  rv = unicodeDecoder->Convert(inStr.get(), &srcLen, ustr.get(), &dstLen);
+  if (NS_SUCCEEDED(rv)){
+    CopyUTF16toUTF8(Substring(ustr.get(), ustr.get() + dstLen), aResult);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP  
+nsUTF8ConverterService::ConvertStringToUTF8(const nsACString &aString, 
+                                            const char *aCharset, 
+                                            bool aSkipCheck, 
+                                            bool aAllowSubstitution,
+                                            uint8_t aOptionalArgc,
+                                            nsACString &aUTF8String)
+{
+  bool allowSubstitution = (aOptionalArgc == 1) ? aAllowSubstitution : true;
+
+  // return if ASCII only or valid UTF-8 providing that the ASCII/UTF-8
+  // check is requested. It may not be asked for if a caller suspects
+  // that the input is in non-ASCII 7bit charset (ISO-2022-xx, HZ) or 
+  // it's in a charset other than UTF-8 that can be mistaken for UTF-8.
+  if (!aSkipCheck && (IsASCII(aString) || IsUTF8(aString))) {
+    aUTF8String = aString;
+    return NS_OK;
+  }
+
+  aUTF8String.Truncate();
+
+  nsresult rv = ToUTF8(aString, aCharset, allowSubstitution, aUTF8String);
+
+  // additional protection for cases where check is skipped and  the input
+  // is actually in UTF-8 as opposed to aCharset. (i.e. caller's hunch
+  // was wrong.) We don't check ASCIIness assuming there's no charset
+  // incompatible with ASCII (we don't support EBCDIC).
+  if (aSkipCheck && NS_FAILED(rv) && IsUTF8(aString)) {
+    aUTF8String = aString;
+    return NS_OK;
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP  
+nsUTF8ConverterService::ConvertURISpecToUTF8(const nsACString &aSpec, 
+                                             const char *aCharset, 
+                                             nsACString &aUTF8Spec)
+{
+  // assume UTF-8 if the spec contains unescaped non-ASCII characters.
+  // No valid spec in Mozilla would break this assumption.
+  if (!IsASCII(aSpec)) {
+    aUTF8Spec = aSpec;
+    return NS_OK;
+  }
+
+  aUTF8Spec.Truncate();
+
+  nsAutoCString unescapedSpec; 
+  // NS_UnescapeURL does not fill up unescapedSpec unless there's at least 
+  // one character to unescape.
+  bool written = NS_UnescapeURL(PromiseFlatCString(aSpec).get(), aSpec.Length(), 
+                                  esc_OnlyNonASCII, unescapedSpec);
+
+  if (!written) {
+    aUTF8Spec = aSpec;
+    return NS_OK;
+  }
+  // return if ASCII only or escaped UTF-8
+  if (IsASCII(unescapedSpec) || IsUTF8(unescapedSpec)) {
+    aUTF8Spec = unescapedSpec;
+    return NS_OK;
+  }
+
+  return ToUTF8(unescapedSpec, aCharset, true, aUTF8Spec);
+}
+