//--------------------------------------
//--- 010 Editor v2.0 Script File
//
// File: XORSelection.1sc
// Author: SweetScape Software
// Revision: 1.0
// Purpose: Xors the current selection
//    with a set of bytes, which causes
//    the bytes to be encoded so they 
//    cannot be read by a human. Run the 
//    Xor again on the encoded selection to 
//    decode the data.
//--------------------------------------

int i, pos, keypos, size;

// Build the key - modify this to use your own key
const int KEY_LENGTH = 8;
uchar key[ KEY_LENGTH ] = { 'P', 'A', 'S', 'S', 'W', 'O', 'R', 'D' };

// Check that a file is open
if( FileCount() == 0 )
{
    MessageBox( idOk, "XORSelection", "XORSelection can only be executed when a file is loaded." );
    return -1;
}

// Initializes the variables
size   = GetSelSize();
pos    = GetSelStart();
keypos = 0;
i      = 0;

// Check that bytes were selected
if( size == 0 )
{
    MessageBox( idOk, "XORSelection", "Please select bytes before running this script." );
    return -1;
}

// Modify the selection
while( i < size )
{
    // Modify the current byte
    WriteUByte( pos, ReadUByte(pos) ^ key[keypos] );

    // Advance to the next byte
    i++;
    pos++;
    keypos++;
    if( keypos == KEY_LENGTH )
        keypos = 0;
}