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static S fastu_fromUtf8(byte[] data) {
char[] chars = new char[data.length];
int len = 0, offset = 0;
while (offset < data.length) {
if ((data[offset] & 0x80) == 0) {
// 0xxxxxxx - it is an ASCII char, so copy it exactly as it is
chars[len] = (char) data[offset];
len++;
offset++;
} else {
int uc = 0;
if ((data[offset] & 0xE0) == 0xC0) {
uc = (int) (data[offset] & 0x1F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
} else if ((data[offset] & 0xF0) == 0xE0) {
uc = (int) (data[offset] & 0x0F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
} else if ((data[offset] & 0xF8) == 0xF0) {
uc = (int) (data[offset] & 0x07);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
} else if ((data[offset] & 0xFC) == 0xF8) {
uc = (int) (data[offset] & 0x03);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
} else if ((data[offset] & 0xFE) == 0xFC) {
uc = (int) (data[offset] & 0x01);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
uc <<= 6;
uc |= (int) (data[offset] & 0x3F);
offset++;
}
len = fastu_fromUtf8_toChars(uc, chars, len);
}
}
ret new S(chars, 0, len);
}
static int fastu_fromUtf8_toChars(int codePoint, char[] dst, int index) {
if (codePoint < 0 || codePoint > Character.MAX_CODE_POINT)
throw new IllegalArgumentException;
if (codePoint < Character.MIN_SUPPLEMENTARY_CODE_POINT) {
dst[index] = (char) codePoint;
ret ++index;
}
int offset = codePoint - Character.MIN_SUPPLEMENTARY_CODE_POINT;
dst[index + 1] = (char) ((offset & 0x3ff) + Character.MIN_LOW_SURROGATE);
dst[index] = (char) ((offset >>> 10) + Character.MIN_HIGH_SURROGATE);
ret index + 2;
}