int32_t String8::getUtf32At(size_t index, size_t *next_index) const
{
return utf32_at(mString, length(), index, next_index);
}
static bool GetExpectedString(
const char *src, char **dst, size_t *dst_len,
int (*get_codepoint_function)(char32_t, char32_t, bool*)) {
if (dst == NULL || dst_len == NULL) {
return false;
}
if (src == NULL || *src == '\0') {
src = STR_FOR_NULL_STR;
}
char32_t codepoints[MAX_CODEPOINTS]; // if array size is changed the for loop needs to be changed
size_t src_len = utf8_length(src);
if (src_len == 0) {
return false;
}
bool next_is_consumed;
size_t j = 0;
for (size_t i = 0; i < src_len && j < MAX_CODEPOINTS;) {
int32_t ret = utf32_at(src, src_len, i, &i);
if (ret < 0) {
// failed to parse UTF-8
return false;
}
ret = get_codepoint_function(
static_cast<char32_t>(ret),
i + 1 < src_len ? src[i + 1] : 0,
&next_is_consumed);
if (ret > 0) {
codepoints[j] = static_cast<char32_t>(ret);
j++;
}
if (next_is_consumed) {
i++;
}
}
size_t length = j;
if (length == 0) {
// If all of codepoints are invalid, we place the string at the end of
// the list.
codepoints[0] = 0x10000 + CODEPOINT_FOR_NULL_STR;
length = 1;
}
size_t new_len = utf8_length_from_utf32(codepoints, length);
*dst = static_cast<char *>(malloc(new_len + 1));
if (*dst == NULL) {
return false;
}
if (utf32_to_utf8(codepoints, length, *dst, new_len + 1) != new_len) {
free(*dst);
*dst = NULL;
return false;
}
*dst_len = new_len;
return true;
}
