ISE Production Code Functions				jpeg_ise::encrypt_file(0)

NAME
jpeg_ise::encrypt_file()

SYNOPSIS
#include <ise.h>
int jpeg_ise::encrypt_file()

DESCRIPTION	
jpeg_ise::encrypt_file()
The encrypt_file() method will take a standard baseline compression jpeg file and selectively encrypt the Huffman Table frames found within the file. 
If the output file already exists, the existing file will be overwritten, otherwise, a new encrypted file will be created for the selectively encrypted jpeg image.

PRE-CONDITIONS
The input_file_name and key ise data memberds must be set using either the overloaded constructor or the set_input_file_name(char* name) and set_key(char* key) functions prior to calling this method.  
This function requires that the input and output file pointers be at the head of the file.  

POST-CONDITIONS  	
An encrypted file will be created with the name and path specified by the output_file_name data member.  
If this data member is NULL, then a default file name will be created based upon the input_file_name data member.

RETURN VALUES
An integer is returned indicating a success or failure.  
0 will indicate a success.  
1 will indicate could not open input file name.  
2 will indicate could not create ise file name.  
3 will indicate could not open ise file.

EXAMPLE USEAGE
// MyJpegIseObj must be of type jpeg_ise
// encrypt jpeg file to ise file
MyJpegIseObj.encrypt_file();

SEE ALSO
ise::ise(),  jpeg_ise::jpeg_ise(),  ise::set_input_file_name(),  ise::set_output_file_name(),  ise::set_key(),  jpeg_ise::decrypt_file()

TEAM ISE		Last Change:  15 April 2004
