Sample code showing how to reparse unit's binary data as another format

JebUnitReparseExample.java

// sample code, needs adjusting/customizing (see TODO tags)
// call reparse() with input information set in a ReparseInformation object

public class ReparseInformation {
    IUnit unit;
    String subUnitName;
    String wantedType;
    long offset;
    long size;
}

// return the reparsed unit (sub-unit) or null on error
public IUnit reparse(ReparseInformation info)
    IUnit unit = info.unit;
  
    IInput subinput = null;
    if(unit instanceof IBinaryUnit) {
        IInput input = ((IBinaryUnit)unit).getInput();
        long offset = info.getOffset();
        long size = info.getSize();
        long maxsize = input.getCurrentSize();
        if((offset + size) > maxsize) {
            // sanitize size - or we could bail, because sanitizing was done by ReparseDialog again
            size = maxsize - offset;
        }
        if(offset >= 0 && size >= 0 && offset <= maxsize) {
            try {
                subinput = new SubInput(input, offset, size);
            }
            catch(IOException e) {
                logger.catching(e);
                return null;
            }
        }
    }

    IUnitProcessor processor = unit.getUnitProcessor();
    IUnitIdentifier ident = processor.getUnitIdentifier(info.getWantedType());
    if(ident == null) {
        return null;
    }

    boolean successfullyIdentified = ident.canIdentify(subinput, unit);
    if(!successfullyIdentified) {
        // TODO: data was not identified as what it should be; can decide to bail or proceed
        // return null;
    }

    IUnit subunit = null;
    try {
        subunit = ident.prepare(info.getSubUnitName(), subinput, processor, unit);
    }
    catch(Exception e) {
        // do not throw if the unit was not identified - we knew failure was near
        if(!successfullyIdentified) {
            logger.catching(e);
        }
        else {
            throw e;
        }
    }
    if(subunit == null) {
        logger.error("Failed to reparse");
        return null;
    }

    if(subunit instanceof INativeCodeUnit) {
        // TODO: may decide to provide additional info. for native code units, eg, a specific image base or endianness info for headless binary blobs
        //INativeCodeUnit<?> pbcu = (INativeCodeUnit<?>)subunit;
        //pbcu.setVirtualImageBase(...);
        //pbcu.getProcessor().setEndianness(...);
    }

    unit.addChild(subunit);
    logger.info("A reparsed sub-unit was created");
    return subunit;
}