397 lines
9.5 KiB
Plaintext
397 lines
9.5 KiB
Plaintext
|
|
||
|
|
------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
README.1ST:
|
||
|
|
|
||
|
|
|
||
|
|
MIME64 Encoder/Decoder
|
||
|
|
|
||
|
|
WHAT MIME64 IS: MIME64 is an encoding described in RFC1341 as MIME base64.
|
||
|
|
Its purpose is to encode binary files into ASCII so that they may be passed
|
||
|
|
through e-mail gates. In this regard, MIME64 is similar to UUENCODE.
|
||
|
|
Although most binaries these days are transmitted using UUENCODE, I
|
||
|
|
have seen a few using MIME64, and I have had requests from friends that
|
||
|
|
I decode MIME64 files that have fallen into their hands. As long as
|
||
|
|
some MIME64 continues to exist, a package such as this one is useful
|
||
|
|
to have.
|
||
|
|
|
||
|
|
|
||
|
|
WHAT THIS PACKAGE CONTAINS: This package contains both executable
|
||
|
|
and ANSI-C source code for a MIME64 encoder/decoder (MIME.EXE and
|
||
|
|
MIME.C respecively). It also contains this README file, and a MIME64
|
||
|
|
encoded file called MIME.64. The latter will decode to MIME.ZIP if
|
||
|
|
you issue the DOS command line:
|
||
|
|
|
||
|
|
MIME64 MIME.64 MIME.ZIP
|
||
|
|
|
||
|
|
If you unzip the zip file, you will get an essay by Mark Grand about
|
||
|
|
MIME.
|
||
|
|
|
||
|
|
|
||
|
|
HOW TO USE THIS PACKAGE: To decode a MIME64 file you may type:
|
||
|
|
|
||
|
|
MIME64 infile outfile
|
||
|
|
|
||
|
|
If you leave out the outfile specification, the output file will
|
||
|
|
overwrite the input file.
|
||
|
|
|
||
|
|
To encode a file into MIME64 format, type:
|
||
|
|
|
||
|
|
MIME64 infile outfile -e
|
||
|
|
|
||
|
|
Again, if you leave off the outfile specification, the output will
|
||
|
|
overwrite the input.
|
||
|
|
|
||
|
|
|
||
|
|
STATUS OF THIS PACKAGE: This package is freeware. As author, I
|
||
|
|
claim no copyright. If you change the source code and intend to
|
||
|
|
propogate that change to other users, please include a comment to
|
||
|
|
that effect at the top that states: The date of the change, the
|
||
|
|
nature of the change, and who made the change. As a courtesy, I also
|
||
|
|
ask that you retain the comment that acknowledges me as the original
|
||
|
|
author.
|
||
|
|
|
||
|
|
|
||
|
|
SEND QUESTIONS ABOUT THIS PACKAGE TO: hahn@lds.loral.com
|
||
|
|
|
||
|
|
Karl Hahn
|
||
|
|
|
||
|
|
------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
MIME64.C:
|
||
|
|
|
||
|
|
/* mime64 */
|
||
|
|
/* MIME base64 encoder/decoder by Karl Hahn hahn@lds.loral.com 3-Aug-94 */
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
||
|
|
"0123456789+/";
|
||
|
|
|
||
|
|
void fputch( char blivit, FILE *f )
|
||
|
|
{
|
||
|
|
/* if (blivit == '\n') fputc( '\r', f );*/
|
||
|
|
fputc( blivit, f );
|
||
|
|
}
|
||
|
|
|
||
|
|
int classify_args( int narg,
|
||
|
|
char *rawargs[], char *fileargs[], char *optargs[] )
|
||
|
|
{
|
||
|
|
int index, jndex, kndex;
|
||
|
|
char *argptr;
|
||
|
|
|
||
|
|
for ( index = 0, jndex = 0, kndex = 0; index < narg; index++ )
|
||
|
|
{
|
||
|
|
argptr = rawargs[index];
|
||
|
|
if (*argptr == '-')
|
||
|
|
{
|
||
|
|
argptr++;
|
||
|
|
optargs[kndex++] = argptr;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fileargs[jndex++] = argptr;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return kndex;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cvt_ascii( unsigned char alpha )
|
||
|
|
{
|
||
|
|
if ( (alpha >= 'A') && (alpha <= 'Z') ) return (int)(alpha - 'A');
|
||
|
|
else if ( (alpha >= 'a') && (alpha <= 'z') )
|
||
|
|
return 26 + (int)(alpha - 'a');
|
||
|
|
else if ( (alpha >= '0') && (alpha <= '9' ) )
|
||
|
|
return 52 + (int)(alpha - '0');
|
||
|
|
else if ( alpha == '+' ) return 62;
|
||
|
|
else if ( alpha == '/' ) return 63;
|
||
|
|
else if ( alpha == '=' ) return -2;
|
||
|
|
else return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
char *fileargs[64], *optargs[64];
|
||
|
|
|
||
|
|
struct STATE64 {
|
||
|
|
unsigned long int accum;
|
||
|
|
int shift;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
int main( int nargs, char *cargs[] )
|
||
|
|
{
|
||
|
|
int n_options, n_files, index, jndex, shift, save_shift;
|
||
|
|
enum { ENCODE, DECODE } whattodo = DECODE;
|
||
|
|
int help_flag = 0, replace_flag = 0, quit = 0;
|
||
|
|
FILE *fin, *fout;
|
||
|
|
unsigned char blivit;
|
||
|
|
unsigned long accum, value;
|
||
|
|
char buf[80];
|
||
|
|
char *cptr, *altptr;
|
||
|
|
int decode_state;
|
||
|
|
|
||
|
|
n_options = classify_args( nargs, cargs, fileargs, optargs );
|
||
|
|
|
||
|
|
n_files = nargs - n_options;
|
||
|
|
|
||
|
|
if ( n_files < 2 ) help_flag = 1;
|
||
|
|
|
||
|
|
for ( index = 0; index < n_options; index++ )
|
||
|
|
{
|
||
|
|
if ( ( optargs[index][0] == 'e' ) ||
|
||
|
|
( optargs[index][0] == 'E' ) ) whattodo = ENCODE;
|
||
|
|
if ( optargs[index][0] == '?' ) help_flag = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( help_flag )
|
||
|
|
{
|
||
|
|
printf( "mime64 infile [outfile] [-option] [-option] etc.\n\n"
|
||
|
|
"convert between binary and MIME BASE64 format\n\n"
|
||
|
|
" -e MIME base64 encode (default is decode)\n"
|
||
|
|
" -? display help message\n\n"
|
||
|
|
"if no outfile given, output file replaces infile\n" );
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( n_files < 2 ) exit(0);
|
||
|
|
|
||
|
|
if ( whattodo == DECODE )
|
||
|
|
{
|
||
|
|
fin = fopen( fileargs[1], "r" );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fin = fopen( fileargs[1], "rb" );
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( fin == 0 )
|
||
|
|
{
|
||
|
|
printf( "%s file not found\n", fileargs[1] );
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( n_files > 2 )
|
||
|
|
{
|
||
|
|
if ( whattodo == DECODE )
|
||
|
|
{
|
||
|
|
fout = fopen( fileargs[2], "wb" );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fout = fopen( fileargs[2], "w" );
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( fout == 0 )
|
||
|
|
{
|
||
|
|
printf( "Couldn't open %s for output\n", fileargs[2] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ( whattodo == DECODE )
|
||
|
|
{
|
||
|
|
fout = fopen( "$$$$$$$$.$$$", "wb" );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fout = fopen( "$$$$$$$$.$$$", "w" );
|
||
|
|
}
|
||
|
|
|
||
|
|
replace_flag = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( whattodo == DECODE )
|
||
|
|
{
|
||
|
|
shift = 0;
|
||
|
|
accum = 0;
|
||
|
|
decode_state = 0;
|
||
|
|
|
||
|
|
while ( ( !feof( fin ) ) && (quit == 0) )
|
||
|
|
{
|
||
|
|
fgets( buf, 80, fin );
|
||
|
|
|
||
|
|
if ( decode_state == 0 )
|
||
|
|
{
|
||
|
|
for ( index = 0;
|
||
|
|
(buf[index] != '\n') && (buf[index] != '\0') &&
|
||
|
|
(decode_state >= 0);
|
||
|
|
index++ )
|
||
|
|
{
|
||
|
|
if ( ( (buf[index] >= 'A') && (buf[index] <= 'Z') ) ||
|
||
|
|
( (buf[index] >= 'a') && (buf[index] <= 'z') ) ||
|
||
|
|
( (buf[index] >= '0') && (buf[index] <= '9') ) ||
|
||
|
|
(buf[index] == '+') ||
|
||
|
|
(buf[index] == '/') ||
|
||
|
|
(buf[index] == '=') )
|
||
|
|
{
|
||
|
|
decode_state = 1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
decode_state = -2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( decode_state <= 0 )
|
||
|
|
{
|
||
|
|
decode_state = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( feof(fin) )
|
||
|
|
{
|
||
|
|
quit = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( quit != 0 )
|
||
|
|
{
|
||
|
|
buf[0] = '\0';
|
||
|
|
}
|
||
|
|
|
||
|
|
for ( index = 0; (buf[index] != '\n') && (buf[index] != '\0'); index++)
|
||
|
|
{
|
||
|
|
value = cvt_ascii( buf[index] );
|
||
|
|
|
||
|
|
if ( value < 64 )
|
||
|
|
{
|
||
|
|
accum <<= 6;
|
||
|
|
shift += 6;
|
||
|
|
accum |= value;
|
||
|
|
if ( shift >= 8 )
|
||
|
|
{
|
||
|
|
shift -= 8;
|
||
|
|
value = accum >> shift;
|
||
|
|
blivit = (unsigned char)value & 0xFFl;
|
||
|
|
fputc( blivit, fout );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
quit = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fprintf ( fout,
|
||
|
|
"Content-Type: text/plain; charset=US-ASCII\n"
|
||
|
|
"Content-transfer-encoding: base64\n\n" );
|
||
|
|
|
||
|
|
shift = 0;
|
||
|
|
accum = 0;
|
||
|
|
index = 0;
|
||
|
|
while ( ( !feof( fin ) ) || (shift != 0) )
|
||
|
|
{
|
||
|
|
if ( ( !feof( fin ) ) && ( quit == 0 ) )
|
||
|
|
{
|
||
|
|
blivit = fgetc( fin );
|
||
|
|
|
||
|
|
if ( feof( fin ) )
|
||
|
|
{
|
||
|
|
quit = 1;
|
||
|
|
save_shift = shift;
|
||
|
|
blivit = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
quit = 1;
|
||
|
|
save_shift = shift;
|
||
|
|
blivit = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( (quit == 0) || (shift != 0) )
|
||
|
|
{
|
||
|
|
value = (unsigned long)blivit;
|
||
|
|
accum <<= 8;
|
||
|
|
shift += 8;
|
||
|
|
accum |= value;
|
||
|
|
} /* ENDIF */
|
||
|
|
|
||
|
|
while ( shift >= 6 )
|
||
|
|
{
|
||
|
|
shift -= 6;
|
||
|
|
value = (accum >> shift) & 0x3Fl;
|
||
|
|
blivit = alphabet[value];
|
||
|
|
|
||
|
|
buf[index++] = blivit;
|
||
|
|
if ( index >= 60 )
|
||
|
|
{
|
||
|
|
buf[index] = '\0';
|
||
|
|
fprintf( fout, "%s\n", buf );
|
||
|
|
index = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( quit != 0 )
|
||
|
|
{
|
||
|
|
shift = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( save_shift == 2 )
|
||
|
|
{
|
||
|
|
buf[index++] = '=';
|
||
|
|
if ( index >= 60 )
|
||
|
|
{
|
||
|
|
buf[index] = '\0';
|
||
|
|
fprintf( fout, "%s\n", buf );
|
||
|
|
index = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf[index++] = '=';
|
||
|
|
if ( index >= 60 )
|
||
|
|
{
|
||
|
|
buf[index] = '\0';
|
||
|
|
fprintf( fout, "%s\n", buf );
|
||
|
|
index = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if ( save_shift == 4 )
|
||
|
|
{
|
||
|
|
buf[index++] = '=';
|
||
|
|
if ( index >= 60 )
|
||
|
|
{
|
||
|
|
buf[index] = '\0';
|
||
|
|
fprintf( fout, "%s\n", buf );
|
||
|
|
index = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( index != 0 )
|
||
|
|
{
|
||
|
|
buf[index] = '\0';
|
||
|
|
fprintf( fout, "%s\n", buf );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fclose( fin );
|
||
|
|
fclose( fout );
|
||
|
|
|
||
|
|
if ( replace_flag )
|
||
|
|
{
|
||
|
|
if ( ( whattodo == DECODE ) && ( decode_state <= 0 ) )
|
||
|
|
{
|
||
|
|
remove( "$$$$$$$$.$$$" );
|
||
|
|
printf( "No MIME base64 lines found in %s\n", fileargs[1] );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
remove( fileargs[1] );
|
||
|
|
rename( "$$$$$$$$.$$$", fileargs[1] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ( ( whattodo == DECODE ) && ( decode_state <= 0 ) )
|
||
|
|
{
|
||
|
|
remove( fileargs[2] );
|
||
|
|
printf( "No MIME base64 lines found in %s\n", fileargs[1] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
------------------------------------------------------------------------------
|