зеркало из https://github.com/mozilla/gecko-dev.git
122 строки
4.1 KiB
C++
122 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:expandtab:shiftwidth=2:tabstop=4:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsString.h"
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#include "nsUTF8ConverterService.h"
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#include "nsEscape.h"
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#include "nsAutoPtr.h"
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#include "nsIUnicodeDecoder.h"
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#include "mozilla/dom/EncodingUtils.h"
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using mozilla::dom::EncodingUtils;
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NS_IMPL_ISUPPORTS(nsUTF8ConverterService, nsIUTF8ConverterService)
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static nsresult
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ToUTF8(const nsACString &aString, const char *aCharset,
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bool aAllowSubstitution, nsACString &aResult)
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{
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nsresult rv;
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if (!aCharset || !*aCharset)
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return NS_ERROR_INVALID_ARG;
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nsDependentCString label(aCharset);
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nsAutoCString encoding;
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if (!EncodingUtils::FindEncodingForLabelNoReplacement(label, encoding)) {
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return NS_ERROR_UCONV_NOCONV;
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}
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nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder =
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EncodingUtils::DecoderForEncoding(encoding);
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if (!aAllowSubstitution)
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unicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal);
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int32_t srcLen = aString.Length();
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int32_t dstLen;
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const nsAFlatCString& inStr = PromiseFlatCString(aString);
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rv = unicodeDecoder->GetMaxLength(inStr.get(), srcLen, &dstLen);
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NS_ENSURE_SUCCESS(rv, rv);
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nsAutoArrayPtr<char16_t> ustr(new char16_t[dstLen]);
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NS_ENSURE_TRUE(ustr, NS_ERROR_OUT_OF_MEMORY);
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rv = unicodeDecoder->Convert(inStr.get(), &srcLen, ustr, &dstLen);
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if (NS_SUCCEEDED(rv)){
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// Tru64 Cxx needs an explicit get()
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CopyUTF16toUTF8(Substring(ustr.get(), ustr + dstLen), aResult);
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}
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return rv;
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}
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NS_IMETHODIMP
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nsUTF8ConverterService::ConvertStringToUTF8(const nsACString &aString,
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const char *aCharset,
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bool aSkipCheck,
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bool aAllowSubstitution,
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uint8_t aOptionalArgc,
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nsACString &aUTF8String)
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{
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bool allowSubstitution = (aOptionalArgc == 1) ? aAllowSubstitution : true;
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// return if ASCII only or valid UTF-8 providing that the ASCII/UTF-8
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// check is requested. It may not be asked for if a caller suspects
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// that the input is in non-ASCII 7bit charset (ISO-2022-xx, HZ) or
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// it's in a charset other than UTF-8 that can be mistaken for UTF-8.
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if (!aSkipCheck && (IsASCII(aString) || IsUTF8(aString))) {
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aUTF8String = aString;
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return NS_OK;
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}
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aUTF8String.Truncate();
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nsresult rv = ToUTF8(aString, aCharset, allowSubstitution, aUTF8String);
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// additional protection for cases where check is skipped and the input
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// is actually in UTF-8 as opposed to aCharset. (i.e. caller's hunch
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// was wrong.) We don't check ASCIIness assuming there's no charset
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// incompatible with ASCII (we don't support EBCDIC).
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if (aSkipCheck && NS_FAILED(rv) && IsUTF8(aString)) {
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aUTF8String = aString;
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return NS_OK;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsUTF8ConverterService::ConvertURISpecToUTF8(const nsACString &aSpec,
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const char *aCharset,
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nsACString &aUTF8Spec)
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{
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// assume UTF-8 if the spec contains unescaped non-ASCII characters.
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// No valid spec in Mozilla would break this assumption.
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if (!IsASCII(aSpec)) {
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aUTF8Spec = aSpec;
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return NS_OK;
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}
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aUTF8Spec.Truncate();
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nsAutoCString unescapedSpec;
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// NS_UnescapeURL does not fill up unescapedSpec unless there's at least
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// one character to unescape.
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bool written = NS_UnescapeURL(PromiseFlatCString(aSpec).get(), aSpec.Length(),
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esc_OnlyNonASCII, unescapedSpec);
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if (!written) {
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aUTF8Spec = aSpec;
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return NS_OK;
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}
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// return if ASCII only or escaped UTF-8
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if (IsASCII(unescapedSpec) || IsUTF8(unescapedSpec)) {
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aUTF8Spec = unescapedSpec;
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return NS_OK;
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}
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return ToUTF8(unescapedSpec, aCharset, true, aUTF8Spec);
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}
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