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COMMON: Process common suffixes for punycoded strings

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This commit is contained in:
Eugene Sandulenko 2022-07-05 15:00:36 +02:00
parent b84b8ac53c
commit b0d722473b
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1 changed files with 53 additions and 0 deletions
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53
common/punycode.cpp
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@ -234,6 +234,54 @@ U32String punycode_decode(const String &src1) {
size_t di = src.findLastOf('-');
Common::String tail;
// Sometimes strings could contain garbage at the end, like '.zip' added
// We try to detect these tails and keep it as is
// First, try to chop off any extensions
size_t dotPos = src.findLastOf('.');
while (dotPos != String::npos && dotPos > di) {
tail = String(src.c_str() + dotPos) + tail;
src = String(src.c_str(), dotPos);
srclen = src.size();
dotPos = src.findLastOf('.');
debug(9, "punycode_decode: src is: '%s', tail is: '%s'", src.c_str(), tail.c_str());
}
// And now scan for the illegal characters as a whole
while (di != 0) {
bool noncode = false;
// Scan string to the end for illegal characters
for (size_t i = di + 1; i < srclen; i++) {
if (!((src[i] >= '0' && src[i] <= '9') || (src[i] >= 'a' && src[i] <= 'z'))) {
noncode = true;
break;
}
}
if (noncode) {
tail = String(src.c_str() + di) + tail;
src = String(src.c_str(), di);
srclen = src.size();
debug(9, "punycode_decode: src is: '%s', tail is: '%s'", src.c_str(), tail.c_str());
di = src.findLastOf('-');
if (di == String::npos) {
warning("punycode_decode: malformed string");
return src1;
}
} else {
break;
}
}
// If we have no '-', the entire string is non-ASCII character insertions.
if (di == String::npos)
di = 0;
@ -313,6 +361,11 @@ U32String punycode_decode(const String &src1) {
i++;
}
// If we chopped off tail, readd it here
dst += tail;
debug(9, "punycode_decode: returning %s", Common::U32String(dst).encode().c_str());
return dst;
}