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403 results
Show changes
Commits on Source (2)
......@@ -153,6 +153,9 @@ int main (void)
test_towc("\xED\xA0\x80", -1, 0xD800);
test_towc("\xED\xBF\xBF", -1, 0xDFFF);
test_towc("\xEE\x80\x80", 3, 0xE000);
/* Overlong surrogates */
test_towc("\xF0\x8D\x88\x80", -1, 0xD800);
test_towc("\xF0\x8D\xBF\xBF", -1, 0xDFFF);
/* Spurious continuation byte */
test_towc("\x80", -1, 0);
test_towc("\xBF", -1, 0);
......
......@@ -112,76 +112,67 @@ int utf8_fprintf( FILE *stream, const char *fmt, ... )
size_t vlc_towc (const char *str, uint32_t *restrict pwc)
{
uint8_t *ptr = (uint8_t *)str, c;
uint32_t cp;
assert (str != NULL);
c = *ptr;
if (unlikely(c > 0xF4))
unsigned char c0 = str[0];
if (likely((c0 & 0x80) == 0)) { // 7-bit ASCII character -> short cut
*pwc = c0;
return c0 != '\0';
}
if (unlikely((c0 & 0x40) == 0))
return -1; // continuation byte -> error
unsigned char c1 = str[1];
uint32_t cp = c1 & 0x3F;
if (unlikely((c1 >> 6) != 2)) // missing continuation byte
return -1;
int charlen = clz((unsigned char)(c ^ 0xFF));
switch (charlen)
{
case 0: // 7-bit ASCII character -> short cut
*pwc = c;
return c != '\0';
if (likely((c0 & 0x20) == 0)) { // two-byte sequence
*pwc = cp = ((c0 & 0x1F) << 6) | cp;
case 1: // continuation byte -> error
return -1;
if (unlikely(cp < 0x80))
return -1; // ASCII overlong
return 2;
}
case 2:
if (unlikely(c < 0xC2)) // ASCII overlong
return -1;
cp = (c & 0x1F) << 6;
break;
unsigned char c2 = str[2];
case 3:
cp = (c & 0x0F) << 12;
break;
cp = (cp << 6) | (c2 & 0x3F);
case 4:
cp = (c & 0x07) << 18;
break;
if (unlikely((c2 >> 6) != 2)) // missing second continuation byte
return -1;
default:
vlc_assert_unreachable ();
if (likely((c0 & 0x10) == 0)) { // three-byte sequence
*pwc = cp = ((c0 & 0xF) << 12) | cp;
if (unlikely(cp < 0x800)) // overlong
return -1;
if (unlikely(cp >= 0xD800 && cp < 0xE000)) // surrogate
return -1;
return 3;
}
/* Unrolled continuation bytes decoding */
switch (charlen)
{
case 4:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F) << 12;
if (unlikely(cp >= 0x110000)) // beyond Unicode range
return -1;
/* fall through */
case 3:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F) << 6;
if (unlikely(cp >= 0xD800 && cp < 0xE000)) // UTF-16 surrogate
return -1;
if (unlikely(cp < (1u << (5 * charlen - 4)))) // non-ASCII overlong
return -1;
/* fall through */
case 2:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F);
break;
if (likely((c0 & 0x08) == 0)) { // four-byte sequence
unsigned char c3 = str[3];
cp = (cp << 6) | (c3 & 0x3F);
if (unlikely((c3 >> 6) != 2)) // missing third continuation byte
return -1;
*pwc = cp = ((c0 & 0xF) << 18) | cp;
if (unlikely(cp < 0x10000)) // overlong (or surrogate)
return -1;
if (unlikely(cp >= 0x110000)) // out of Unicode range
return -1;
return 4;
}
*pwc = cp;
return charlen;
return -1;
}
/**
......