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Optimize php_filter_encode_html() #18795

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Optimize php_filter_encode_html() #18795

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d045721
Use ZVAL_NEW_STR() for new string in php_filter_encode_html()
nielsdos Jun 7, 2025
896abd1
Output blocks of safe chars in php_filter_encode_html()
nielsdos Jun 7, 2025
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10 changes: 6 additions & 4 deletions ext/filter/sanitizing_filters.c
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Original file line number Diff line number Diff line change
Expand Up @@ -31,25 +31,27 @@ static void php_filter_encode_html(zval *value, const unsigned char *chars)
size_t len = Z_STRLEN_P(value);
unsigned char *s = (unsigned char *)Z_STRVAL_P(value);
unsigned char *e = s + len;
unsigned char *last_output = s;

if (Z_STRLEN_P(value) == 0) {
return;
}

while (s < e) {
if (chars[*s]) {
smart_str_appendl(&str, (const char *) last_output, s - last_output);
smart_str_appendl(&str, "&#", 2);
smart_str_append_unsigned(&str, (zend_ulong)*s);
smart_str_appendc(&str, ';');
} else {
/* XXX: this needs to be optimized to work with blocks of 'safe' chars */
smart_str_appendc(&str, *s);
last_output = s + 1;
}
s++;
}

smart_str_appendl(&str, (const char *) last_output, s - last_output);

zval_ptr_dtor(value);
ZVAL_STR(value, smart_str_extract(&str));
ZVAL_NEW_STR(value, smart_str_extract(&str));
}

static const unsigned char hexchars[] = "0123456789ABCDEF";
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