/**
* Read data from encoded values and run len into regular data array
*
* @param ddata is encoded data values
* @return the data array of row data
*/
public byte[] readOneRowData(byte[] ddata, int rLen, int xt)
throws IOException, InvalidRangeException {
int run;
byte[] bdata = new byte[xt];
int nbin = 0;
int total = 0;
for (run = 0; run < rLen; run++) {
int drun = DataType.unsignedByteToShort(ddata[run]) >> 4;
byte dcode1 = (byte) (DataType.unsignedByteToShort(ddata[run]) & 0Xf);
for (int i = 0; i < drun; i++) {
bdata[nbin++] = dcode1;
total++;
}
}
if (total < xt) {
for (run = total; run < xt; run++) {
bdata[run] = 0;
}
}
return bdata;
}
int getInt(byte[] b, int offset, int num) {
int base = 1;
int i;
int word = 0;
int bv[] = new int[num];
for (i = 0; i < num; i++) {
bv[i] = DataType.unsignedByteToShort(b[offset + i]);
}
if (bv[0] > 127) {
bv[0] -= 128;
base = -1;
}
/*
* Calculate the integer value of the byte sequence
*/
for (i = num - 1; i >= 0; i--) {
word += base * bv[i];
base *= 256;
}
return word;
}
private void convertScaleOffsetUnsignedByte(IndexIterator iterIn, IndexIterator iterOut) {
boolean checkMissing = useNaNs && hasMissing();
while (iterIn.hasNext()) {
byte valb = iterIn.getByteNext();
double val = scale * DataType.unsignedByteToShort(valb) + offset;
iterOut.setDoubleNext(checkMissing && isMissing_(val) ? Double.NaN : val);
}
}
public double convertScaleOffsetMissing(byte valb) {
if (!hasScaleOffset) return useNaNs && isMissing((double) valb) ? Double.NaN : (double) valb;
double convertedValue;
if (isUnsigned) convertedValue = scale * DataType.unsignedByteToShort(valb) + offset;
else convertedValue = scale * valb + offset;
return useNaNs && isMissing(convertedValue) ? Double.NaN : convertedValue;
}
// all the work is here, so can be called recursively
public Object readOneScanData(ByteBuffer bos, NOWRadheader.Vinfo vinfo, String vName)
throws IOException, InvalidRangeException {
int doff = (int) vinfo.hoff;
int npixel = vinfo.yt * vinfo.xt;
byte[] rdata = null;
byte[] ldata = new byte[vinfo.xt];
byte[] pdata = new byte[npixel];
byte[] b2 = new byte[2];
bos.position(doff);
// begining of image data
if ((DataType.unsignedByteToShort(bos.get()) != 0xF0) || (bos.get() != 0x0C)) {
return null;
}
int ecode;
int color;
int datapos;
int offset = 0;
int roffset = 0;
boolean newline = true;
int linenum = 0;
while (true) {
// line number
if (newline) {
bos.get(b2);
linenum = (DataType.unsignedByteToShort(b2[1]) << 8) + DataType.unsignedByteToShort(b2[0]);
// System.out.println("Line Number = " + linenum);
}
// int linenum = bytesToInt(b2[0], b2[1], true);
// System.out.println("Line Number = " + linenum);
// if(linenum == 1225)
// System.out.println(" HHHHH");
short b = DataType.unsignedByteToShort(bos.get());
color = b & 0xF;
ecode = b >> 4;
datapos = bos.position();
int datarun;
if (ecode == 0xF) {
byte bb1 = bos.get(datapos - 2);
byte bb2 = bos.get(datapos);
if ((color == 0x0) && (bb1 == 0x00) && (bb2 == 0x00)) {
datapos += 1;
}
bos.position(datapos);
datarun = 0;
} else if (ecode == 0xE) {
byte b0 = bos.get(datapos);
datarun = DataType.unsignedByteToShort(b0) + 1;
datapos += 1;
bos.position(datapos);
} else if (ecode == 0xD) {
b2[0] = bos.get(datapos);
b2[1] = bos.get(datapos + 1);
datarun =
(DataType.unsignedByteToShort(b2[1]) << 8) + DataType.unsignedByteToShort(b2[0]) + 1;
datapos += 2;
bos.position(datapos);
} else {
datarun = ecode + 1;
}
// move the unpacked data in the data line
rdata = new byte[datarun];
for (int i = 0; i < datarun; i++) {
rdata[i] = (byte) color;
}
System.arraycopy(rdata, 0, ldata, roffset, datarun);
roffset = roffset + datarun;
// System.out.println("run ecode = " + ecode + " and data run " + datarun + " and totalrun " +
// roffset);
// check to see if the beginning of the next line or at the end of the file
short c0 = DataType.unsignedByteToShort(bos.get());
if (c0 == 0x00) {
short c1 = DataType.unsignedByteToShort(bos.get());
short c2 = DataType.unsignedByteToShort(bos.get());
// System.out.println("c1 and c2 " + c1 + " " + c2);
if ((c0 == 0x00) && (c1 == 0xF0) && (c2 == 0x0C)) {
// beginning of next line
// System.out.println("linenum " + linenum + " and this line total " + roffset);
// if (roffset != 3661) {
// System.out.println("ERROR missing data, this line total only " + roffset);
// }
System.arraycopy(ldata, 0, pdata, offset, roffset);
offset = offset + vinfo.xt;
roffset = 0;
newline = true;
ldata = new byte[vinfo.xt];
} else if ((c1 == 0xF0) && (c2 == 0x02)) {
// end of the file
break;
} else {
datapos = bos.position() - 3;
bos.position(datapos);
newline = false;
}
} else {
newline = false;
datapos = bos.position();
bos.position(datapos - 1);
}
}
return pdata;
}