// Compute a sparse float buffer
private byte[] bufD(final int valsz) {
int log = 0;
while ((1 << log) < valsz) ++log;
assert (1 << log) == valsz;
final int ridsz = _len >= 65535 ? 4 : 2;
final int elmsz = ridsz + valsz;
int off = CXDChunk._OFF;
byte[] buf = MemoryManager.malloc1(off + sparseLen() * elmsz, true);
for (int i = 0; i < sparseLen(); i++, off += elmsz) {
if (ridsz == 2) UnsafeUtils.set2(buf, off, (short) _id[i]);
else UnsafeUtils.set4(buf, off, _id[i]);
final double dval =
_ds == null ? isNA2(i) ? Double.NaN : _ls[i] * PrettyPrint.pow10(_xs[i]) : _ds[i];
switch (valsz) {
case 4:
UnsafeUtils.set4f(buf, off + ridsz, (float) dval);
break;
case 8:
UnsafeUtils.set8d(buf, off + ridsz, dval);
break;
default:
throw H2O.fail();
}
}
assert off == buf.length;
return buf;
}
// Compute a compressed integer buffer
private byte[] bufX(long bias, int scale, int off, int log) {
byte[] bs = new byte[(_len << log) + off];
int j = 0;
for (int i = 0; i < _len; i++) {
long le = -bias;
if (_id == null || _id.length == 0 || (j < _id.length && _id[j] == i)) {
if (isNA2(j)) {
le = NAS[log];
} else {
int x = (_xs[j] == Integer.MIN_VALUE + 1 ? 0 : _xs[j]) - scale;
le += x >= 0 ? _ls[j] * PrettyPrint.pow10i(x) : _ls[j] / PrettyPrint.pow10i(-x);
}
++j;
}
switch (log) {
case 0:
bs[i + off] = (byte) le;
break;
case 1:
UnsafeUtils.set2(bs, (i << 1) + off, (short) le);
break;
case 2:
UnsafeUtils.set4(bs, (i << 2) + off, (int) le);
break;
case 3:
UnsafeUtils.set8(bs, (i << 3) + off, le);
break;
default:
throw H2O.fail();
}
}
assert j == sparseLen()
: "j = " + j + ", len = " + sparseLen() + ", len2 = " + _len + ", id[j] = " + _id[j];
return bs;
}
// Compute a sparse integer buffer
private byte[] bufS(final int valsz) {
int log = 0;
while ((1 << log) < valsz) ++log;
assert valsz == 0 || (1 << log) == valsz;
final int ridsz = _len >= 65535 ? 4 : 2;
final int elmsz = ridsz + valsz;
int off = CXIChunk._OFF;
byte[] buf = MemoryManager.malloc1(off + sparseLen() * elmsz, true);
for (int i = 0; i < sparseLen(); i++, off += elmsz) {
if (ridsz == 2) UnsafeUtils.set2(buf, off, (short) _id[i]);
else UnsafeUtils.set4(buf, off, _id[i]);
if (valsz == 0) {
assert _xs[i] == 0 && _ls[i] == 1;
continue;
}
assert _xs[i] == Integer.MIN_VALUE || _xs[i] >= 0
: "unexpected exponent " + _xs[i]; // assert we have int or NA
final long lval =
_xs[i] == Integer.MIN_VALUE ? NAS[log] : _ls[i] * PrettyPrint.pow10i(_xs[i]);
switch (valsz) {
case 1:
buf[off + ridsz] = (byte) lval;
break;
case 2:
short sval = (short) lval;
UnsafeUtils.set2(buf, off + ridsz, sval);
break;
case 4:
int ival = (int) lval;
UnsafeUtils.set4(buf, off + ridsz, ival);
break;
case 8:
UnsafeUtils.set8(buf, off + ridsz, lval);
break;
default:
throw H2O.fail();
}
}
assert off == buf.length;
return buf;
}