// caller needs to free() the result
WCHAR *DecodeHtmlEntitites(const char *string, UINT codepage)
{
WCHAR *fixed = str::conv::FromCodePage(string, codepage), *dst = fixed;
const WCHAR *src = fixed;
while (*src) {
if (*src != '&') {
*dst++ = *src++;
continue;
}
src++;
// numeric entities
int unicode;
if (str::Parse(src, L"#%d;", &unicode) ||
str::Parse(src, L"#x%x;", &unicode)) {
*dst++ = IntToChar(unicode);
src = str::FindChar(src, ';') + 1;
continue;
}
// named entities
int rune = -1;
const WCHAR *entityEnd = src;
while (iswalnum(*entityEnd))
entityEnd++;
if (entityEnd != src) {
size_t entityLen = entityEnd - src;
rune = HtmlEntityNameToRune(src, entityLen);
}
if (-1 != rune) {
*dst++ = IntToChar(rune);
src = entityEnd;
if (*src == ';')
++src;
} else {
*dst++ = '&';
}
}
*dst = '\0';
return fixed;
}
// if "&foo;" was the entity, s points at the char
// after '&' and len is the maximum lenght of the string
// (4 in case of "foo;")
// returns a pointer to the first character after the entity
const char *ResolveHtmlEntity(const char *s, size_t len, int& rune)
{
const char *entEnd = str::Parse(s, len, "#%d%?;", &rune);
if (entEnd)
return entEnd;
entEnd = str::Parse(s, len, "#x%x%?;", &rune);
if (entEnd)
return entEnd;
// go to the end of a potential named entity
for (entEnd = s; entEnd < s + len && isalnum((unsigned char)*entEnd); entEnd++);
if (entEnd != s) {
rune = HtmlEntityNameToRune(s, entEnd - s);
if (-1 == rune)
return NULL;
// skip the trailing colon - if there is one
if (entEnd < s + len && *entEnd == ';')
entEnd++;
return entEnd;
}
rune = -1;
return NULL;
}
