gecko-dev/intl/uconv/nsUTF8ConverterService.cpp
2017-06-13 13:23:23 +03:00

110 lines
3.6 KiB
C++

/* -*- 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 "mozilla/Encoding.h"
using namespace mozilla;
NS_IMPL_ISUPPORTS(nsUTF8ConverterService, nsIUTF8ConverterService)
static nsresult
ToUTF8(const nsACString& aString,
const char* aCharset,
bool aAllowSubstitution,
nsACString& aResult)
{
if (!aCharset || !*aCharset)
return NS_ERROR_INVALID_ARG;
auto encoding = Encoding::ForLabelNoReplacement(MakeStringSpan(aCharset));
if (!encoding) {
return NS_ERROR_UCONV_NOCONV;
}
if (aAllowSubstitution) {
nsresult rv = encoding->DecodeWithoutBOMHandling(aString, aResult);
if (NS_SUCCEEDED(rv)) {
return NS_OK;
}
return rv;
}
return encoding->DecodeWithoutBOMHandlingAndWithoutReplacement(aString,
aResult);
}
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);
}