Detect-It-Easy/db/ACE

// Detect an ACE archive.
// Author: Jason Hood <jadoxa@yahoo.com.au>
/*
   Only tested with 2.04.
*/

includeScript("archive-file");
sName = "ACE";

function detect_ACE(bFile) {
    var nOffset, nSize;

    if (bFile) {
        nOffset = 0;
        nSize = File.getSize();
    } else {
        nOffset = File.getOverlayOffset();
        nSize = File.getOverlaySize();
    }

    if (nSize > 48) {
        if (File.compare("'**ACE**'", nOffset + 7)) {
            bDetected = true;
            sVersion = "2";

            if (File.readByte(nOffset + 6) & 0x80) {
                sOptions = "solid";
            }

            if (File.compare("'UNREGISTERED'", nOffset + 32)) {
                sOptions = sOptions.append("unregistered");
            }

            // Not sure about this...
            var nOffset = File.findSignature(nOffset + 0x20, 128, "000101");
            if (nOffset != -1) {
                nOffset -= 3;
                while (nOffset < File.getSize()) {
                    var nPacked = File.readDword(nOffset + 7);
                    Archive.add(File.readDword(nOffset + 11), nPacked,
                        File.readByte(nOffset + 19) & 16);
                    nOffset += 0x23 + File.readWord(nOffset + 0x21) + nPacked;
                }
                sOptions = sOptions.append(Archive.contents());
            }
        }
    }
}