/* -*- 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 "nsIDNService.h" #include "nsReadableUtils.h" #include "nsCRT.h" #include "nsUnicharUtils.h" #include "nsUnicodeProperties.h" #include "nsUnicodeScriptCodes.h" #include "harfbuzz/hb.h" #include "nsIServiceManager.h" #include "nsIPrefService.h" #include "nsIPrefBranch.h" #include "nsIObserverService.h" #include "nsISupportsPrimitives.h" #include "punycode.h" #ifdef IDNA2008 // Currently we use the transitional processing option -- see // http://unicode.org/reports/tr46/ // To switch to non-transitional processing, change the value of this flag // and kTransitionalProcessing in netwerk/test/unit/test_idna2008.js to false // (patch in bug 1218179). const bool kIDNA2008_TransitionalProcessing = true; #include "ICUUtils.h" #endif using namespace mozilla::unicode; //----------------------------------------------------------------------------- // RFC 1034 - 3.1. Name space specifications and terminology static const uint32_t kMaxDNSNodeLen = 63; // RFC 3490 - 5. ACE prefix static const char kACEPrefix[] = "xn--"; #define kACEPrefixLen 4 //----------------------------------------------------------------------------- #define NS_NET_PREF_IDNBLACKLIST "network.IDN.blacklist_chars" #define NS_NET_PREF_SHOWPUNYCODE "network.IDN_show_punycode" #define NS_NET_PREF_IDNWHITELIST "network.IDN.whitelist." #define NS_NET_PREF_IDNUSEWHITELIST "network.IDN.use_whitelist" #define NS_NET_PREF_IDNRESTRICTION "network.IDN.restriction_profile" inline bool isOnlySafeChars(const nsAFlatString& in, const nsAFlatString& blacklist) { return (blacklist.IsEmpty() || in.FindCharInSet(blacklist) == kNotFound); } //----------------------------------------------------------------------------- // nsIDNService //----------------------------------------------------------------------------- /* Implementation file */ NS_IMPL_ISUPPORTS(nsIDNService, nsIIDNService, nsIObserver, nsISupportsWeakReference) nsresult nsIDNService::Init() { nsCOMPtr prefs(do_GetService(NS_PREFSERVICE_CONTRACTID)); if (prefs) prefs->GetBranch(NS_NET_PREF_IDNWHITELIST, getter_AddRefs(mIDNWhitelistPrefBranch)); nsCOMPtr prefInternal(do_QueryInterface(prefs)); if (prefInternal) { prefInternal->AddObserver(NS_NET_PREF_IDNBLACKLIST, this, true); prefInternal->AddObserver(NS_NET_PREF_SHOWPUNYCODE, this, true); prefInternal->AddObserver(NS_NET_PREF_IDNRESTRICTION, this, true); prefInternal->AddObserver(NS_NET_PREF_IDNUSEWHITELIST, this, true); prefsChanged(prefInternal, nullptr); } return NS_OK; } NS_IMETHODIMP nsIDNService::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *aData) { if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) { nsCOMPtr prefBranch( do_QueryInterface(aSubject) ); if (prefBranch) prefsChanged(prefBranch, aData); } return NS_OK; } void nsIDNService::prefsChanged(nsIPrefBranch *prefBranch, const char16_t *pref) { if (!pref || NS_LITERAL_STRING(NS_NET_PREF_IDNBLACKLIST).Equals(pref)) { nsCOMPtr blacklist; nsresult rv = prefBranch->GetComplexValue(NS_NET_PREF_IDNBLACKLIST, NS_GET_IID(nsISupportsString), getter_AddRefs(blacklist)); if (NS_SUCCEEDED(rv)) blacklist->ToString(getter_Copies(mIDNBlacklist)); else mIDNBlacklist.Truncate(); } if (!pref || NS_LITERAL_STRING(NS_NET_PREF_SHOWPUNYCODE).Equals(pref)) { bool val; if (NS_SUCCEEDED(prefBranch->GetBoolPref(NS_NET_PREF_SHOWPUNYCODE, &val))) mShowPunycode = val; } if (!pref || NS_LITERAL_STRING(NS_NET_PREF_IDNUSEWHITELIST).Equals(pref)) { bool val; if (NS_SUCCEEDED(prefBranch->GetBoolPref(NS_NET_PREF_IDNUSEWHITELIST, &val))) mIDNUseWhitelist = val; } if (!pref || NS_LITERAL_STRING(NS_NET_PREF_IDNRESTRICTION).Equals(pref)) { nsXPIDLCString profile; if (NS_FAILED(prefBranch->GetCharPref(NS_NET_PREF_IDNRESTRICTION, getter_Copies(profile)))) { profile.Truncate(); } if (profile.EqualsLiteral("moderate")) { mRestrictionProfile = eModeratelyRestrictiveProfile; } else if (profile.EqualsLiteral("high")) { mRestrictionProfile = eHighlyRestrictiveProfile; } else { mRestrictionProfile = eASCIIOnlyProfile; } } } nsIDNService::nsIDNService() { #ifdef IDNA2008 uint32_t IDNAOptions = UIDNA_CHECK_BIDI | UIDNA_CHECK_CONTEXTJ; if (!kIDNA2008_TransitionalProcessing) { IDNAOptions |= UIDNA_NONTRANSITIONAL_TO_UNICODE; } UErrorCode errorCode = U_ZERO_ERROR; mIDNA = uidna_openUTS46(IDNAOptions, &errorCode); #else if (idn_success != idn_nameprep_create(nullptr, &mNamePrepHandle)) mNamePrepHandle = nullptr; mNormalizer = do_GetService(NS_UNICODE_NORMALIZER_CONTRACTID); /* member initializers and constructor code */ #endif } nsIDNService::~nsIDNService() { #ifdef IDNA2008 uidna_close(mIDNA); #else idn_nameprep_destroy(mNamePrepHandle); #endif } #ifdef IDNA2008 nsresult nsIDNService::IDNA2008ToUnicode(const nsACString& input, nsAString& output) { NS_ConvertUTF8toUTF16 inputStr(input); UIDNAInfo info = UIDNA_INFO_INITIALIZER; UErrorCode errorCode = U_ZERO_ERROR; int32_t inLen = inputStr.Length(); int32_t outMaxLen = inLen - kACEPrefixLen + 1; UChar outputBuffer[kMaxDNSNodeLen + 1]; int32_t outLen = uidna_labelToUnicode(mIDNA, (const UChar*)inputStr.get(), inLen, outputBuffer, outMaxLen, &info, &errorCode); if (info.errors != 0) { return NS_ERROR_FAILURE; } if (U_SUCCESS(errorCode)) { ICUUtils::AssignUCharArrayToString(outputBuffer, outLen, output); } return ICUUtils::UErrorToNsResult(errorCode); } nsresult nsIDNService::IDNA2008StringPrep(const nsAString& input, nsAString& output, stringPrepFlag flag) { UIDNAInfo info = UIDNA_INFO_INITIALIZER; UErrorCode errorCode = U_ZERO_ERROR; int32_t inLen = input.Length(); int32_t outMaxLen = kMaxDNSNodeLen + 1; UChar outputBuffer[kMaxDNSNodeLen + 1]; int32_t outLen = uidna_labelToUnicode(mIDNA, (const UChar*)PromiseFlatString(input).get(), inLen, outputBuffer, outMaxLen, &info, &errorCode); nsresult rv = ICUUtils::UErrorToNsResult(errorCode); NS_ENSURE_SUCCESS(rv, rv); // Output the result of nameToUnicode even if there were errors ICUUtils::AssignUCharArrayToString(outputBuffer, outLen, output); if (flag == eStringPrepIgnoreErrors) { return NS_OK; } if (info.errors != 0) { if (flag == eStringPrepForDNS) { output.Truncate(); } rv = NS_ERROR_FAILURE; } return rv; } #endif NS_IMETHODIMP nsIDNService::ConvertUTF8toACE(const nsACString & input, nsACString & ace) { return UTF8toACE(input, ace, eStringPrepForDNS); } nsresult nsIDNService::UTF8toACE(const nsACString & input, nsACString & ace, stringPrepFlag flag) { nsresult rv; NS_ConvertUTF8toUTF16 ustr(input); // map ideographic period to ASCII period etc. normalizeFullStops(ustr); uint32_t len, offset; len = 0; offset = 0; nsAutoCString encodedBuf; nsAString::const_iterator start, end; ustr.BeginReading(start); ustr.EndReading(end); ace.Truncate(); // encode nodes if non ASCII while (start != end) { len++; if (*start++ == (char16_t)'.') { rv = stringPrepAndACE(Substring(ustr, offset, len - 1), encodedBuf, flag); NS_ENSURE_SUCCESS(rv, rv); ace.Append(encodedBuf); ace.Append('.'); offset += len; len = 0; } } // encode the last node if non ASCII if (len) { rv = stringPrepAndACE(Substring(ustr, offset, len), encodedBuf, flag); NS_ENSURE_SUCCESS(rv, rv); ace.Append(encodedBuf); } return NS_OK; } NS_IMETHODIMP nsIDNService::ConvertACEtoUTF8(const nsACString & input, nsACString & _retval) { return ACEtoUTF8(input, _retval, eStringPrepForDNS); } nsresult nsIDNService::ACEtoUTF8(const nsACString & input, nsACString & _retval, stringPrepFlag flag) { // RFC 3490 - 4.2 ToUnicode // ToUnicode never fails. If any step fails, then the original input // sequence is returned immediately in that step. uint32_t len = 0, offset = 0; nsAutoCString decodedBuf; nsACString::const_iterator start, end; input.BeginReading(start); input.EndReading(end); _retval.Truncate(); // loop and decode nodes while (start != end) { len++; if (*start++ == '.') { if (NS_FAILED(decodeACE(Substring(input, offset, len - 1), decodedBuf, flag))) { _retval.Assign(input); return NS_OK; } _retval.Append(decodedBuf); _retval.Append('.'); offset += len; len = 0; } } // decode the last node if (len) { if (NS_FAILED(decodeACE(Substring(input, offset, len), decodedBuf, flag))) _retval.Assign(input); else _retval.Append(decodedBuf); } return NS_OK; } NS_IMETHODIMP nsIDNService::IsACE(const nsACString & input, bool *_retval) { nsACString::const_iterator begin; input.BeginReading(begin); const char *data = begin.get(); uint32_t dataLen = begin.size_forward(); // look for the ACE prefix in the input string. it may occur // at the beginning of any segment in the domain name. for // example: "www.xn--ENCODED.com" const char *p = PL_strncasestr(data, kACEPrefix, dataLen); *_retval = p && (p == data || *(p - 1) == '.'); return NS_OK; } NS_IMETHODIMP nsIDNService::Normalize(const nsACString & input, nsACString & output) { // protect against bogus input NS_ENSURE_TRUE(IsUTF8(input), NS_ERROR_UNEXPECTED); NS_ConvertUTF8toUTF16 inUTF16(input); normalizeFullStops(inUTF16); // pass the domain name to stringprep label by label nsAutoString outUTF16, outLabel; uint32_t len = 0, offset = 0; nsresult rv; nsAString::const_iterator start, end; inUTF16.BeginReading(start); inUTF16.EndReading(end); while (start != end) { len++; if (*start++ == char16_t('.')) { rv = stringPrep(Substring(inUTF16, offset, len - 1), outLabel, eStringPrepIgnoreErrors); NS_ENSURE_SUCCESS(rv, rv); outUTF16.Append(outLabel); outUTF16.Append(char16_t('.')); offset += len; len = 0; } } if (len) { rv = stringPrep(Substring(inUTF16, offset, len), outLabel, eStringPrepIgnoreErrors); NS_ENSURE_SUCCESS(rv, rv); outUTF16.Append(outLabel); } CopyUTF16toUTF8(outUTF16, output); return NS_OK; } NS_IMETHODIMP nsIDNService::ConvertToDisplayIDN(const nsACString & input, bool * _isASCII, nsACString & _retval) { // If host is ACE, then convert to UTF-8 if the host is in the IDN whitelist. // Else, if host is already UTF-8, then make sure it is normalized per IDN. nsresult rv = NS_OK; // Even if the hostname is not ASCII, individual labels may still be ACE, so // test IsACE before testing IsASCII bool isACE; IsACE(input, &isACE); if (IsASCII(input)) { // first, canonicalize the host to lowercase, for whitelist lookup _retval = input; ToLowerCase(_retval); if (isACE && !mShowPunycode) { // ACEtoUTF8() can't fail, but might return the original ACE string nsAutoCString temp(_retval); // If the domain is in the whitelist, return the host in UTF-8. // Otherwise convert from ACE to UTF8 only those labels which are // considered safe for display ACEtoUTF8(temp, _retval, isInWhitelist(temp) ? eStringPrepIgnoreErrors : eStringPrepForUI); *_isASCII = IsASCII(_retval); } else { *_isASCII = true; } } else { // We have to normalize the hostname before testing against the domain // whitelist (see bug 315411), and to ensure the entire string gets // normalized. // // Normalization and the tests for safe display below, assume that the // input is Unicode, so first convert any ACE labels to UTF8 if (isACE) { nsAutoCString temp; ACEtoUTF8(input, temp, eStringPrepIgnoreErrors); rv = Normalize(temp, _retval); } else { rv = Normalize(input, _retval); } if (NS_FAILED(rv)) return rv; if (mShowPunycode && NS_SUCCEEDED(UTF8toACE(_retval, _retval, eStringPrepIgnoreErrors))) { *_isASCII = true; return NS_OK; } // normalization could result in an ASCII-only hostname. alternatively, if // the host is converted to ACE by the normalizer, then the host may contain // unsafe characters, so leave it ACE encoded. see bug 283016, bug 301694, and bug 309311. *_isASCII = IsASCII(_retval); if (!*_isASCII && !isInWhitelist(_retval)) { // UTF8toACE with eStringPrepForUI may return a domain name where // some labels are in UTF-8 and some are in ACE, depending on // whether they are considered safe for display rv = UTF8toACE(_retval, _retval, eStringPrepForUI); *_isASCII = IsASCII(_retval); return rv; } } return NS_OK; } //----------------------------------------------------------------------------- static nsresult utf16ToUcs4(const nsAString& in, uint32_t *out, uint32_t outBufLen, uint32_t *outLen) { uint32_t i = 0; nsAString::const_iterator start, end; in.BeginReading(start); in.EndReading(end); while (start != end) { char16_t curChar; curChar= *start++; if (start != end && NS_IS_HIGH_SURROGATE(curChar) && NS_IS_LOW_SURROGATE(*start)) { out[i] = SURROGATE_TO_UCS4(curChar, *start); ++start; } else out[i] = curChar; i++; if (i >= outBufLen) return NS_ERROR_FAILURE; } out[i] = (uint32_t)'\0'; *outLen = i; return NS_OK; } #ifndef IDNA2008 static void ucs4toUtf16(const uint32_t *in, nsAString& out) { while (*in) { if (!IS_IN_BMP(*in)) { out.Append((char16_t) H_SURROGATE(*in)); out.Append((char16_t) L_SURROGATE(*in)); } else out.Append((char16_t) *in); in++; } } #endif static nsresult punycode(const nsAString& in, nsACString& out) { uint32_t ucs4Buf[kMaxDNSNodeLen + 1]; uint32_t ucs4Len; nsresult rv = utf16ToUcs4(in, ucs4Buf, kMaxDNSNodeLen, &ucs4Len); NS_ENSURE_SUCCESS(rv, rv); // need maximum 20 bits to encode 16 bit Unicode character // (include null terminator) const uint32_t kEncodedBufSize = kMaxDNSNodeLen * 20 / 8 + 1 + 1; char encodedBuf[kEncodedBufSize]; punycode_uint encodedLength = kEncodedBufSize; enum punycode_status status = punycode_encode(ucs4Len, ucs4Buf, nullptr, &encodedLength, encodedBuf); if (punycode_success != status || encodedLength >= kEncodedBufSize) return NS_ERROR_FAILURE; encodedBuf[encodedLength] = '\0'; out.Assign(nsDependentCString(kACEPrefix) + nsDependentCString(encodedBuf)); return rv; } // RFC 3454 // // 1) Map -- For each character in the input, check if it has a mapping // and, if so, replace it with its mapping. This is described in section 3. // // 2) Normalize -- Possibly normalize the result of step 1 using Unicode // normalization. This is described in section 4. // // 3) Prohibit -- Check for any characters that are not allowed in the // output. If any are found, return an error. This is described in section // 5. // // 4) Check bidi -- Possibly check for right-to-left characters, and if any // are found, make sure that the whole string satisfies the requirements // for bidirectional strings. If the string does not satisfy the requirements // for bidirectional strings, return an error. This is described in section 6. // // 5) Check unassigned code points -- If allowUnassigned is false, check for // any unassigned Unicode points and if any are found return an error. // This is described in section 7. // nsresult nsIDNService::stringPrep(const nsAString& in, nsAString& out, stringPrepFlag flag) { #ifdef IDNA2008 return IDNA2008StringPrep(in, out, flag); #else if (!mNamePrepHandle || !mNormalizer) return NS_ERROR_FAILURE; uint32_t ucs4Buf[kMaxDNSNodeLen + 1]; uint32_t ucs4Len; nsresult rv = utf16ToUcs4(in, ucs4Buf, kMaxDNSNodeLen, &ucs4Len); NS_ENSURE_SUCCESS(rv, rv); // map idn_result_t idn_err; uint32_t namePrepBuf[kMaxDNSNodeLen * 3]; // map up to three characters idn_err = idn_nameprep_map(mNamePrepHandle, (const uint32_t *) ucs4Buf, (uint32_t *) namePrepBuf, kMaxDNSNodeLen * 3); NS_ENSURE_TRUE(idn_err == idn_success, NS_ERROR_FAILURE); nsAutoString namePrepStr; ucs4toUtf16(namePrepBuf, namePrepStr); if (namePrepStr.Length() >= kMaxDNSNodeLen) return NS_ERROR_FAILURE; // normalize nsAutoString normlizedStr; rv = mNormalizer->NormalizeUnicodeNFKC(namePrepStr, normlizedStr); if (normlizedStr.Length() >= kMaxDNSNodeLen) return NS_ERROR_FAILURE; // set the result string out.Assign(normlizedStr); if (flag == eStringPrepIgnoreErrors) { return NS_OK; } // prohibit const uint32_t *found = nullptr; idn_err = idn_nameprep_isprohibited(mNamePrepHandle, (const uint32_t *) ucs4Buf, &found); if (idn_err != idn_success || found) { rv = NS_ERROR_FAILURE; } else { // check bidi idn_err = idn_nameprep_isvalidbidi(mNamePrepHandle, (const uint32_t *) ucs4Buf, &found); if (idn_err != idn_success || found) { rv = NS_ERROR_FAILURE; } else if (flag == eStringPrepForUI) { // check unassigned code points idn_err = idn_nameprep_isunassigned(mNamePrepHandle, (const uint32_t *) ucs4Buf, &found); if (idn_err != idn_success || found) { rv = NS_ERROR_FAILURE; } } } if (flag == eStringPrepForDNS && NS_FAILED(rv)) { out.Truncate(); } return rv; #endif } nsresult nsIDNService::stringPrepAndACE(const nsAString& in, nsACString& out, stringPrepFlag flag) { nsresult rv = NS_OK; out.Truncate(); if (in.Length() > kMaxDNSNodeLen) { NS_WARNING("IDN node too large"); return NS_ERROR_FAILURE; } if (IsASCII(in)) { LossyCopyUTF16toASCII(in, out); return NS_OK; } nsAutoString strPrep; rv = stringPrep(in, strPrep, flag); if (flag == eStringPrepForDNS) { NS_ENSURE_SUCCESS(rv, rv); } if (IsASCII(strPrep)) { LossyCopyUTF16toASCII(strPrep, out); return NS_OK; } if (flag == eStringPrepForUI && NS_SUCCEEDED(rv) && isLabelSafe(in)) { CopyUTF16toUTF8(strPrep, out); return NS_OK; } rv = punycode(strPrep, out); // Check that the encoded output isn't larger than the maximum length // of a DNS node per RFC 1034. // This test isn't necessary in the code paths above where the input // is ASCII (since the output will be the same length as the input) or // where we convert to UTF-8 (since the output is only used for // display in the UI and not passed to DNS and can legitimately be // longer than the limit). if (out.Length() > kMaxDNSNodeLen) { NS_WARNING("IDN node too large"); return NS_ERROR_FAILURE; } return rv; } // RFC 3490 // 1) Whenever dots are used as label separators, the following characters // MUST be recognized as dots: U+002E (full stop), U+3002 (ideographic full // stop), U+FF0E (fullwidth full stop), U+FF61 (halfwidth ideographic full // stop). void nsIDNService::normalizeFullStops(nsAString& s) { nsAString::const_iterator start, end; s.BeginReading(start); s.EndReading(end); int32_t index = 0; while (start != end) { switch (*start) { case 0x3002: case 0xFF0E: case 0xFF61: s.Replace(index, 1, NS_LITERAL_STRING(".")); break; default: break; } start++; index++; } } nsresult nsIDNService::decodeACE(const nsACString& in, nsACString& out, stringPrepFlag flag) { bool isAce; IsACE(in, &isAce); if (!isAce) { out.Assign(in); return NS_OK; } nsAutoString utf16; #ifdef IDNA2008 nsresult result = IDNA2008ToUnicode(in, utf16); NS_ENSURE_SUCCESS(result, result); #else // RFC 3490 - 4.2 ToUnicode // The ToUnicode output never contains more code points than its input. punycode_uint output_length = in.Length() - kACEPrefixLen + 1; punycode_uint *output = new punycode_uint[output_length]; NS_ENSURE_TRUE(output, NS_ERROR_OUT_OF_MEMORY); enum punycode_status status = punycode_decode(in.Length() - kACEPrefixLen, PromiseFlatCString(in).get() + kACEPrefixLen, &output_length, output, nullptr); if (status != punycode_success) { delete [] output; return NS_ERROR_FAILURE; } // UCS4 -> UTF8 output[output_length] = 0; ucs4toUtf16(output, utf16); delete [] output; #endif if (flag != eStringPrepForUI || isLabelSafe(utf16)) { CopyUTF16toUTF8(utf16, out); } else { out.Assign(in); return NS_OK; } // Validation: encode back to ACE and compare the strings nsAutoCString ace; nsresult rv = UTF8toACE(out, ace, flag); NS_ENSURE_SUCCESS(rv, rv); if (flag == eStringPrepForDNS && !ace.Equals(in, nsCaseInsensitiveCStringComparator())) { return NS_ERROR_FAILURE; } return NS_OK; } bool nsIDNService::isInWhitelist(const nsACString &host) { if (mIDNUseWhitelist && mIDNWhitelistPrefBranch) { nsAutoCString tld(host); // make sure the host is ACE for lookup and check that there are no // unassigned codepoints if (!IsASCII(tld) && NS_FAILED(UTF8toACE(tld, tld, eStringPrepForDNS))) { return false; } // truncate trailing dots first tld.Trim("."); int32_t pos = tld.RFind("."); if (pos == kNotFound) return false; tld.Cut(0, pos + 1); bool safe; if (NS_SUCCEEDED(mIDNWhitelistPrefBranch->GetBoolPref(tld.get(), &safe))) return safe; } return false; } bool nsIDNService::isLabelSafe(const nsAString &label) { if (!isOnlySafeChars(PromiseFlatString(label), mIDNBlacklist)) { return false; } // We should never get here if the label is ASCII NS_ASSERTION(!IsASCII(label), "ASCII label in IDN checking"); if (mRestrictionProfile == eASCIIOnlyProfile) { return false; } nsAString::const_iterator current, end; label.BeginReading(current); label.EndReading(end); int32_t lastScript = MOZ_SCRIPT_INVALID; uint32_t previousChar = 0; uint32_t savedNumberingSystem = 0; // Simplified/Traditional Chinese check temporarily disabled -- bug 857481 #if 0 HanVariantType savedHanVariant = HVT_NotHan; #endif int32_t savedScript = -1; while (current != end) { uint32_t ch = *current++; if (NS_IS_HIGH_SURROGATE(ch) && current != end && NS_IS_LOW_SURROGATE(*current)) { ch = SURROGATE_TO_UCS4(ch, *current++); } // Check for restricted characters; aspirational scripts are permitted XidmodType xm = GetIdentifierModification(ch); if (xm != XIDMOD_RECOMMENDED && xm != XIDMOD_INCLUSION && xm != XIDMOD_ASPIRATIONAL) { return false; } // Check for mixed script int32_t script = GetScriptCode(ch); if (script != MOZ_SCRIPT_COMMON && script != MOZ_SCRIPT_INHERITED && script != lastScript) { if (illegalScriptCombo(script, savedScript)) { return false; } lastScript = script; } // Check for mixed numbering systems if (GetGeneralCategory(ch) == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) { uint32_t zeroCharacter = ch - GetNumericValue(ch); if (savedNumberingSystem == 0) { // If we encounter a decimal number, save the zero character from that // numbering system. savedNumberingSystem = zeroCharacter; } else if (zeroCharacter != savedNumberingSystem) { return false; } } // Check for consecutive non-spacing marks if (previousChar != 0 && previousChar == ch && GetGeneralCategory(ch) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) { return false; } // Simplified/Traditional Chinese check temporarily disabled -- bug 857481 #if 0 // Check for both simplified-only and traditional-only Chinese characters HanVariantType hanVariant = GetHanVariant(ch); if (hanVariant == HVT_SimplifiedOnly || hanVariant == HVT_TraditionalOnly) { if (savedHanVariant == HVT_NotHan) { savedHanVariant = hanVariant; } else if (hanVariant != savedHanVariant) { return false; } } #endif previousChar = ch; } return true; } // Scripts that we care about in illegalScriptCombo static const int32_t scriptTable[] = { MOZ_SCRIPT_BOPOMOFO, MOZ_SCRIPT_CYRILLIC, MOZ_SCRIPT_GREEK, MOZ_SCRIPT_HANGUL, MOZ_SCRIPT_HAN, MOZ_SCRIPT_HIRAGANA, MOZ_SCRIPT_KATAKANA, MOZ_SCRIPT_LATIN }; #define BOPO 0 #define CYRL 1 #define GREK 2 #define HANG 3 #define HANI 4 #define HIRA 5 #define KATA 6 #define LATN 7 #define OTHR 8 #define JPAN 9 // Latin + Han + Hiragana + Katakana #define CHNA 10 // Latin + Han + Bopomofo #define KORE 11 // Latin + Han + Hangul #define HNLT 12 // Latin + Han (could be any of the above combinations) #define FAIL 13 static inline int32_t findScriptIndex(int32_t aScript) { int32_t tableLength = sizeof(scriptTable) / sizeof(int32_t); for (int32_t index = 0; index < tableLength; ++index) { if (aScript == scriptTable[index]) { return index; } } return OTHR; } static const int32_t scriptComboTable[13][9] = { /* thisScript: BOPO CYRL GREK HANG HANI HIRA KATA LATN OTHR * savedScript */ /* BOPO */ { BOPO, FAIL, FAIL, FAIL, CHNA, FAIL, FAIL, CHNA, FAIL }, /* CYRL */ { FAIL, CYRL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL }, /* GREK */ { FAIL, FAIL, GREK, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL }, /* HANG */ { FAIL, FAIL, FAIL, HANG, KORE, FAIL, FAIL, KORE, FAIL }, /* HANI */ { CHNA, FAIL, FAIL, KORE, HANI, JPAN, JPAN, HNLT, FAIL }, /* HIRA */ { FAIL, FAIL, FAIL, FAIL, JPAN, HIRA, JPAN, JPAN, FAIL }, /* KATA */ { FAIL, FAIL, FAIL, FAIL, JPAN, JPAN, KATA, JPAN, FAIL }, /* LATN */ { CHNA, FAIL, FAIL, KORE, HNLT, JPAN, JPAN, LATN, OTHR }, /* OTHR */ { FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, OTHR, FAIL }, /* JPAN */ { FAIL, FAIL, FAIL, FAIL, JPAN, JPAN, JPAN, JPAN, FAIL }, /* CHNA */ { CHNA, FAIL, FAIL, FAIL, CHNA, FAIL, FAIL, CHNA, FAIL }, /* KORE */ { FAIL, FAIL, FAIL, KORE, KORE, FAIL, FAIL, KORE, FAIL }, /* HNLT */ { CHNA, FAIL, FAIL, KORE, HNLT, JPAN, JPAN, HNLT, FAIL } }; bool nsIDNService::illegalScriptCombo(int32_t script, int32_t& savedScript) { if (savedScript == -1) { savedScript = findScriptIndex(script); return false; } savedScript = scriptComboTable[savedScript] [findScriptIndex(script)]; /* * Special case combinations that depend on which profile is in use * In the Highly Restrictive profile Latin is not allowed with any * other script * * In the Moderately Restrictive profile Latin mixed with any other * single script is allowed. */ return ((savedScript == OTHR && mRestrictionProfile == eHighlyRestrictiveProfile) || savedScript == FAIL); } #undef BOPO #undef CYRL #undef GREK #undef HANG #undef HANI #undef HIRA #undef KATA #undef LATN #undef OTHR #undef JPAN #undef CHNA #undef KORE #undef HNLT #undef FAIL