internal unsafe static bool IsValid(char* name, ushort start, ref int returnedEnd, bool notImplicitFile) {
ushort end = (ushort) returnedEnd;
if (start==end)
return false;
//
// First segment could consist of only '_' or '-' but it cannot be all digits or empty
//
bool validShortName = false;
ushort i = start;
for (; i < end; ++i)
{
if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#')))
{
end = i;
break;
}
else if (name[i] == '.')
{
++i;
break;
}
if (Char.IsLetter(name[i]) || name[i] == '-' || name[i] == '_')
{
validShortName = true;
}
else if (name[i] < '0' || name[i] > '9')
return false;
}
if (!validShortName)
return false;
//
// Subsequent segments must start with a letter or a digit
//
for (; i < end; ++i)
{
if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#')))
{
end = i;
break;
}
else if (name[i] == '.')
{
if (!validShortName || ((i-1) >= start && name[i-1] == '.'))
return false;
validShortName = false;
}
else if (name[i] == '-' || name[i] == '_')
{
if (!validShortName)
return false;
}
else if (Char.IsLetter(name[i]) || (name[i] >= '0' && name[i] <= '9'))
{
if (!validShortName)
validShortName = true;
}
else
return false;
}
// last segment can end with the dot
if (((i-1) >= start && name[i-1] == '.'))
validShortName = true;
if (!validShortName)
return false;
// caller must check for (end - start <= MaximumInternetNameLength)
returnedEnd = end;
return true;
}
}
