/**
* _cairo_utf8_to_utf16:
* @str: an UTF-8 string
* @len: length of @str in bytes, or -1 if it is nul-terminated.
* If @len is supplied and the string has an embedded nul
* byte, only the portion before the nul byte is converted.
* @result: location to store a pointer to a newly allocated UTF-16
* string (always native endian). Free with free(). A 0
* word will be written after the last character.
* @items_written: location to store number of 16-bit words
* written. (Not including the trailing 0)
*
* Converts a UTF-8 string to UTF-16. UTF-16 is an encoding of Unicode
* where characters are represented either as a single 16-bit word, or
* as a pair of 16-bit "surrogates". The string is validated to
* consist entirely of valid Unicode characters.
*
* Return value: %CAIRO_STATUS_SUCCESS if the entire string was
* succesfully converted. %CAIRO_STATUS_INVALID_STRING if an
* an invalid sequence was found.
**/
cairo_status_t
_cairo_utf8_to_utf16 (const unsigned char *str,
int len,
uint16_t **result,
int *items_written)
{
uint16_t *str16 = NULL;
int n16, i;
const unsigned char *in;
in = str;
n16 = 0;
while ((len < 0 || str + len - in > 0) && *in) {
uint32_t wc = _utf8_get_char_extended (in, str + len - in);
if (wc & 0x80000000 || !UNICODE_VALID (wc))
return CAIRO_STATUS_INVALID_STRING;
if (wc < 0x10000)
n16 += 1;
else
n16 += 2;
if (n16 == INT_MAX - 1 || n16 == INT_MAX)
return CAIRO_STATUS_INVALID_STRING;
in = UTF8_NEXT_CHAR (in);
}
str16 = malloc (sizeof (uint16_t) * (n16 + 1));
if (!str16)
return CAIRO_STATUS_NO_MEMORY;
in = str;
for (i = 0; i < n16;) {
uint32_t wc = _utf8_get_char (in);
if (wc < 0x10000) {
str16[i++] = wc;
} else {
str16[i++] = (wc - 0x10000) / 0x400 + 0xd800;
str16[i++] = (wc - 0x10000) % 0x400 + 0xdc00;
}
in = UTF8_NEXT_CHAR (in);
}
str16[i] = 0;
*result = str16;
if (items_written)
*items_written = n16;
return CAIRO_STATUS_SUCCESS;
}
/**
* _cairo_utf8_to_ucs4:
* @str: an UTF-8 string
* @len: length of @str in bytes, or -1 if it is nul-terminated.
* If @len is supplied and the string has an embedded nul
* byte, only the portion before the nul byte is converted.
* @result: location to store a pointer to a newly allocated UTF-32
* string (always native endian), or %NULL. Free with free(). A 0
* word will be written after the last character.
* @items_written: location to store number of 32-bit words
* written. (Not including the trailing 0)
*
* Converts a UTF-8 string to UCS-4. UCS-4 is an encoding of Unicode
* with 1 32-bit word per character. The string is validated to
* consist entirely of valid Unicode characters.
*
* Return value: %CAIRO_STATUS_SUCCESS if the entire string was
* successfully converted. %CAIRO_STATUS_INVALID_STRING if an
* invalid sequence was found.
**/
cairo_status_t
_cairo_utf8_to_ucs4 (const char *str,
int len,
uint32_t **result,
int *items_written)
{
uint32_t *str32 = NULL;
int n_chars, i;
const unsigned char *in;
const unsigned char * const ustr = (const unsigned char *) str;
in = ustr;
n_chars = 0;
while ((len < 0 || ustr + len - in > 0) && *in)
{
uint32_t wc = _utf8_get_char_extended (in, ustr + len - in);
if (wc & 0x80000000 || !UNICODE_VALID (wc))
return _cairo_error (CAIRO_STATUS_INVALID_STRING);
n_chars++;
if (n_chars == INT_MAX)
return _cairo_error (CAIRO_STATUS_INVALID_STRING);
in = UTF8_NEXT_CHAR (in);
}
if (result) {
str32 = _cairo_malloc_ab (n_chars + 1, sizeof (uint32_t));
if (!str32)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
in = ustr;
for (i=0; i < n_chars; i++) {
str32[i] = _utf8_get_char (in);
in = UTF8_NEXT_CHAR (in);
}
str32[i] = 0;
*result = str32;
}
if (items_written)
*items_written = n_chars;
return CAIRO_STATUS_SUCCESS;
}
