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****** IMPORTANT: Hexconv comes with ABSOLUTELY NO WARRANTY
****** Please read the GPL for details.
******
****** Author - Shaun Marquardt
****** E-Mail -
******
****** This program is Copyright (c) 2003 Shaun Marquardt -
Hexconv README
With this release, it no longer matters if you have spaces in your hexidecimal string
or not. You can also have lowercase letters, if you like, instead of all uppercase.
Here's an example:
The text string "blah egg log mog fog"
Comes out hex: "626C616820656767206C6f67206d6f6720666F67"
You may also have spaces in the hex:
62 6C 61 68 20 65 67 67 20 6C 6F 67 20 6D 6F 67 20 66 6F 67
Which comes out string "b l a h e g g l o g m o g f o g"
Just like as if you didn't need to add any \x20 (spaces)
You can also have lowercase hex letters as so:
626c616820656767206c6f67206d6f6720666f67
And it returns the same "blah egg log mog fog"
Well, enjoy, and if you like my program, send money! :)
Thanks a lot for trying my programs! If you like, send money :) - Shaun

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
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Public License instead of this License.

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/* hexconv - A Full Ascii to Hexidecimal & Hexidecimal to Ascii Converter.
Copyright (C) 2003 Shaun Marquardt
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
To Contact Shaun Marquardt, email: dev@ncplus.net
*/
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define TRUE 1
#define FALSE !TRUE
void atoh( char *input );
void htoa( char *input );
void main( void )
{
char input[5000];
clrscr();
printf("1: Convert a string to Hexidecimal\n");
printf("2: Convert hexidecimal to a String\n");
printf("3: Exit\n");
printf("\nEnter your choice: ");
switch(getche())
{
case '1':
printf("\nEnter the string to be converted\n: ");
gets(input);
atoh(input);
break;
case '2':
printf("\nEnter the hexidecimal - read the README for more info\n: ");
gets(input);
htoa(input);
break;
case '3': break;
default:
printf("\nThat is an invalid choice!");
getch();
main();
} //end switch
exit(0);
}
void atoh( char *input )
{
unsigned char a;
int x = 0, col = 0;
int done;
printf("String - \"%s\"\n",input);
printf("--== Output ==--\n\n");
printf("\"");
done = FALSE;
while(!done)
{ //Go through list of characters
for(a=32;a<128;a++)
{
if(input[x] == '\0') //End of input, done.
{
printf("\"\n");
done = TRUE;
break;
}
if(a != input[x] && input[x] != '\0') //Not matching, continue
continue;
if(a == input[x] ) //Matching, print character
{
printf("%X",a);
col++;
if(col >= 79)
{
col = 0;
printf("\n\r");
}
break;
}
} //end for
x++;
} //end while
printf("\nDone. Press the enter key to exit the program.");
getch();
exit(0);
} //end atoh
void htoa( char *input )
{
unsigned char a;
char hex[5];
char buf[5];
int x = 0, col = 0;
int done;
hex[0] = '\0';
if( (strlen(input) % 2) != 0 )
{
printf("Hex characters must be entered in pairs.\n");
getch();
exit(1);
}
printf("Hex - \"%s\"\n",input);
printf("--== Output ==--\n\n");
printf("\"");
done = FALSE;
while(!done)
{
if(input[x] == '\0') //End of input, done.
{
printf("\"\n");
done = TRUE;
break;
}
if(input[x] == ' ') //Space character? Print out a space.
{
printf("%c", ' ');
x++;
}
sprintf(hex, "%c%c", toupper(input[x]), toupper(input[x+1])); //Get Hex Char
x+=2;
for(a=32;a<128;a++)
{ //Go through list of characters
sprintf(buf, "%X",a);
if(!strcmp(buf, hex)) //Matching, print character
printf("%c",a);
else //Not Matching, continue
continue;
col++;
if(col >= 79)
{
col = 0;
printf("\n\r");
}
break;
} //end "a" for loop
} //end while
printf("\nDone. Press the enter key to exit the program.");
getch();
exit(0);
} //end htoa

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Version Information for hexconv by Shaun Marquardt
Version 1.3 - 6/24/04
- Huge BUG Fix for Windows XP system compatibility.
- Hex characters must now be entered in pairs.
- Change the wording on a few things.
Version 1.2.1: - Minor change release
- It no longer matters if you include spaces or not with htoa
- You can now use lowercase letters if you so desire
- Please read the README file for examples of the above
Version 1.2:
- Added some comments and GPL notice
- Placed finishing touches on htoa, including output formatting
- NOTICE: Anything below Version 1.2 was never made publically available. I
place this version info for historical reasons.
Version 1.1:
- Fixed htoa
- Changed output of atoh (program) to be compatible with htoa
Version 1.0:
- Initial Creation of Program, htoa was buggy.