public CompressionLookupRecord(java.nio.ByteBuffer buffer,
int compressionLookupSubsectionLocation,
RPFColorMap[] colormaps // TODO update LUT with the color mapped values to gain performance
)
{
this.tableID = NITFSUtil.getUShort(buffer);
this.numOfRecords = (int)NITFSUtil.getUInt(buffer);
this.numOfValuesPerRecord = NITFSUtil.getUShort(buffer);
this.valueBitLength = NITFSUtil.getUShort(buffer);
this.tableLocation = (int)(NITFSUtil.getUInt(buffer) + compressionLookupSubsectionLocation);
int saveOffset = buffer.position();
this.bytesPerRecord = (short)(this.numOfValuesPerRecord * this.valueBitLength / 8L);
this.lut = new byte[this.numOfRecords * this.bytesPerRecord];
buffer.position(this.tableLocation);
buffer.get(this.lut, 0, this.numOfRecords * this.bytesPerRecord);
buffer.position(saveOffset);
}
private int parseSegment(NITFSSegmentType segType, int nextSegmentOffset)
{
int headerLengthSize = segType.getHeaderLengthSize();
int dataLengthSize = segType.getDataLengthSize();
int numOfSegments = Integer.parseInt(NITFSUtil.getString(this.buffer, 3));
for (int i = 0; i < numOfSegments; i++)
{
int segHeaderLength = Integer.parseInt(NITFSUtil.getString(this.buffer, headerLengthSize));
int seqDataLength = Integer.parseInt(NITFSUtil.getString(this.buffer, dataLengthSize));
int saveOffset = this.buffer.position(); // pass buffer to NITFSSegment to parse their headers' contents
NITFSSegment segment;
switch (segType)
{
case IMAGE_SEGMENT:
segment = new NITFSImageSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case SYMBOL_SEGMENT:
segment = new NITFSSymbolSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case LABEL_SEGMENT:
segment = new NITFSLabelSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case TEXT_SEGMENT:
segment = new NITFSTextSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case DATA_EXTENSION_SEGMENT:
segment = new NITFSDataExtensionSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case RESERVED_EXTENSION_SEGMENT:
segment = new NITFSReservedExtensionSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case USER_DEFINED_HEADER_SEGMENT:
segment = new RPFUserDefinedHeaderSegment(this.buffer);
break;
case EXTENDED_HEADER_SEGMENT: // // throw exception - wrong parser for EXTENDED_HEADER_SEGMENT
segment = new NITFSExtendedHeaderSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
default:
throw new NITFSRuntimeException("NITFSReader.UnknownOrUnsupportedSegment", segType.ToString());
}
this.segments.add(segment);
nextSegmentOffset += segHeaderLength + seqDataLength;
buffer.position(saveOffset); // restore offset
}
return(nextSegmentOffset);
}
