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Check ScriptExtensions property of combining marks when available.

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This commit is contained in:
wolfbeast 2018-02-08 19:47:21 +01:00 • committed by Roy Tam
commit ce02714e1f
1 changed files with 34 additions and 3 deletions
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37
netwerk/dns/nsIDNService.cpp
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@ -26,6 +26,7 @@
const bool kIDNA2008_TransitionalProcessing = false;
#include "ICUUtils.h"
#include "unicode/uscript.h"
#endif
using namespace mozilla::unicode;
@ -835,8 +836,8 @@ bool nsIDNService::isLabelSafe(const nsAString &label)
}
// Check for mixed numbering systems
if (GetGeneralCategory(ch) ==
HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) {
auto genCat = GetGeneralCategory(ch);
if (genCat == 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
@ -847,11 +848,41 @@ bool nsIDNService::isLabelSafe(const nsAString &label)
}
}
if (GetGeneralCategory(ch) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) {
if (genCat == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) {
// Check for consecutive non-spacing marks
if (previousChar != 0 && previousChar == ch) {
return false;
}
// Check for marks whose expected script doesn't match the base script.
if (lastScript != Script::INVALID) {
const size_t kMaxScripts = 32; // more than ample for current values
// of ScriptExtensions property
UScriptCode scripts[kMaxScripts];
UErrorCode errorCode = U_ZERO_ERROR;
int nScripts = uscript_getScriptExtensions(ch, scripts, kMaxScripts,
&errorCode);
MOZ_ASSERT(U_SUCCESS(errorCode), "uscript_getScriptExtensions failed");
if (U_FAILURE(errorCode)) {
return false;
}
// nScripts will always be >= 1, because even for undefined characters
// uscript_getScriptExtensions will return Script::INVALID.
// If the mark just has script=COMMON or INHERITED, we can't check any
// more carefully, but if it has specific scriptExtension codes, then
// assume those are the only valid scripts to use it with.
if (nScripts > 1 ||
(Script(scripts[0]) != Script::COMMON &&
Script(scripts[0]) != Script::INHERITED)) {
while (--nScripts >= 0) {
if (Script(scripts[nScripts]) == lastScript) {
break;
}
}
if (nScripts == -1) {
return false;
}
}
}
// Check for diacritics on dotless-i or dotless-j, which would be
// indistinguishable from normal accented letter.
if ((baseChar == 0x0237 || baseChar == 0x0131) &&