ReverseFileEndianness.1sc

//------------------------------------------------
//--- 010 Editor v9.0.2 Script File
//
//      File: ReverseFileEndianness.1sc
//   Authors: Ramprasad Ramshankar
//   Version: 1.0
//   Purpose: To reverse the byte order (endianness) of a file in 010 editor. 
//  Category: Binary
//   History: 
//   1.0    Initial Release
//------------------------------------------------

/*
    References: 
    Sample script used: https://www.sweetscape.com/010editor/repository/files/NibblesReverse.1sc
    List of data types: https://www.sweetscape.com/010editor/manual/DataTypes.htm
    List of interface functions:
        You need these functions to interact with the 010 editor
        https://www.sweetscape.com/010editor/manual/FuncInterface.htm
        Interface functions used here: GetFileNum(), FileNew(), FileSelect()
    List of I/O functions:
        You need these functions to process data from the files. 
        https://www.sweetscape.com/010editor/manual/FuncIO.htm
        I/O functions used here: ReadByte(), WriteByte()
*/

/*
	Files in 010 editor will have integer file handles. 
	cur_file will store the handle to the currently opened file. 
	new_file will store the handle to the newly opened file. 
*/
int cur_file,new_file;

// Variables to store file size.
int cur_file_size, new_file_size;

// Temporary variable to store a single byte. 
UBYTE byte_var;

/*
	Obtaining file handles. 
	Handle to the currently open file can simply be obtained through GetFileNum()
	The output file is a new file and the handle is obtained through FileNew(content_type). The content_type can be Hex, Text or Unicode.
*/
cur_file = GetFileNum();
new_file = FileNew("Hex");

// To work with a file, we need to select the it using the FileSelect(file_handle)
FileSelect(cur_file);
// Obtaining size of the curent file. 
cur_file_size=FileSize()-1;

//Printf("File cur_file_size is %d",cur_file_size);


while(cur_file_size>=0)
{
	// Reading contents of the current file one byte at a time starting from the last byte. 
    FileSelect(cur_file);
	byte_var = ReadByte(cur_file_size);

	// Writing the byte value to the new file starting from the first byte (effectively reversing the file)
	FileSelect(new_file);
	WriteByte(new_file_size, byte_var);

	// Counters, so that we know when to get out of the while loop. 
    cur_file_size--;
    new_file_size++;
}