public static DOSStub readStub(DOSHeader header, IDataReader dr) throws IOException {
DOSStub ds = new DOSStub();
int pos = dr.getPosition();
int add = header.getAddressOfNewExeHeader();
byte[] stub = new byte[add - pos];
dr.read(stub);
ds.setStub(stub);
return ds;
}
public static DOSHeader readDos(IDataReader dr) throws IOException {
DOSHeader dh = new DOSHeader();
dh.setMagic(dr.readWord());
dh.setUsedBytesInLastPage(dr.readWord());
dh.setFileSizeInPages(dr.readWord());
dh.setNumRelocationItems(dr.readWord());
dh.setHeaderSizeInParagraphs(dr.readWord());
dh.setMinExtraParagraphs(dr.readWord());
dh.setMaxExtraParagraphs(dr.readWord());
dh.setInitialSS(dr.readWord());
dh.setInitialSP(dr.readWord());
dh.setChecksum(dr.readWord());
dh.setInitialIP(dr.readWord());
dh.setInitialRelativeCS(dr.readWord());
dh.setAddressOfRelocationTable(dr.readWord());
dh.setOverlayNumber(dr.readWord());
int[] reserved = new int[4];
for (int i = 0; i < reserved.length; i++) {
reserved[i] = dr.readWord();
}
dh.setReserved(reserved);
dh.setOemId(dr.readWord());
dh.setOemInfo(dr.readWord());
int[] reserved2 = new int[10];
for (int i = 0; i < reserved2.length; i++) {
reserved2[i] = dr.readWord();
}
dh.setReserved2(reserved2);
dh.setAddressOfNewExeHeader(dr.readDoubleWord());
// calc stub size
int stubSize = dh.getFileSizeInPages() * 512 - (512 - dh.getUsedBytesInLastPage());
if (stubSize > dh.getAddressOfNewExeHeader()) stubSize = dh.getAddressOfNewExeHeader();
stubSize -= dh.getHeaderSizeInParagraphs() * 16;
dh.setStubSize(stubSize);
return dh;
}