// Detect It Easy: DiE-JS framework file
// Don't change anything unless you're sure about what you're doing

// Detect an ARJ archive.
// Info from http://www.fileformat.info/format/arj/corion.htm
includeScript("archive-file");
sName = "ARJ";

function detect_ARJ(bFile, bShowOptions) {
    var nOffset, nSize;
    if (bFile) {
        nOffset = 0;
        nSize = File.getSize();
    } else {
        nOffset = File.getOverlayOffset() + 8;
        nSize = File.getOverlaySize();
    }
    if (nSize >= 64) {
        if (File.compare("60EA", nOffset)) {
            sVersion = File.readByte(nOffset + 5);
            bDetected = true;
        }
        if (bDetected && bShowOptions) {
            // Options
            switch (File.readByte(nOffset + 7)) // Host OS
            {
                case (0):
                    sOptions = sOptions.append("MS-DOS");
                    break;
                case (1):
                    sOptions = sOptions.append("PRIMOS");
                    break;
                case (2):
                    sOptions = sOptions.append("UNIX");
                    break;
                case (3):
                    sOptions = sOptions.append("AMIGA");
                    break;
                case (4):
                    sOptions = sOptions.append("MAC-OS");
                    break;
                case (5):
                    sOptions = sOptions.append("OS/2");
                    break;
                case (6):
                    sOptions = sOptions.append("APPLE GS");
                    break;
                case (7):
                    sOptions = sOptions.append("ATARI ST");
                    break;
                case (8):
                    sOptions = sOptions.append("NeXT");
                    break;
                case (9):
                    sOptions = sOptions.append("VAX VMS");
                    break;
            }
            if (File.readByte(nOffset + 8) & 0x01) // password
            {
                sOptions = sOptions.append("encrypted");
            }

            switch (File.readByte(nOffset + 9)) // Compression method
            {
                case (0):
                    sOptions = sOptions.append("stored");
                    break;
                case (1):
                    sOptions = sOptions.append("compressed most");
                    break;
                case (2):
                    sOptions = sOptions.append("compressed");
                    break;
                case (3):
                    sOptions = sOptions.append("compressed faster");
                    break;
                case (4):
                    sOptions = sOptions.append("compressed fastest");
                    break;
            }
        }
    }
}