+++ /dev/null
-/*
- * Encode or decode file as MIME base64 (RFC 1341)
- * Public domain by John Walker, August 11 1997
- * Modified slightly for the Citadel system, June 1999
- *
- * This program is open source software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 3.
- *
- * 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.
- */
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-
-#define TRUE 1
-#define FALSE 0
-
-#define LINELEN 72 /* Encoded line length (max 76) */
-
-typedef unsigned char byte; /* Byte type */
-
-FILE *fi; /* Input file */
-FILE *fo; /* Output file */
-static byte iobuf[256]; /* I/O buffer */
-static int iolen = 0; /* Bytes left in I/O buffer */
-static int iocp = 256; /* Character removal pointer */
-static int ateof = FALSE; /* EOF encountered */
-static byte dtable[256]; /* Encode / decode table */
-static int linelength = 0; /* Length of encoded output line */
-static char eol[] = "\r\n"; /* End of line sequence */
-static int errcheck = TRUE; /* Check decode input for errors ? */
-
-/* INBUF -- Fill input buffer with data */
-
-static int inbuf(void)
-{
- int l;
-
- if (ateof) {
- return FALSE;
- }
- l = fread(iobuf, 1, sizeof iobuf, fi); /* Read input buffer */
- if (l <= 0) {
- if (ferror(fi)) {
- exit(1);
- }
- ateof = TRUE;
- return FALSE;
- }
- iolen = l;
- iocp = 0;
- return TRUE;
-}
-
-/* INCHAR -- Return next character from input */
-
-static int inchar(void)
-{
- if (iocp >= iolen) {
- if (!inbuf()) {
- return EOF;
- }
- }
-
- return iobuf[iocp++];
-}
-
-/* OCHAR -- Output an encoded character, inserting line breaks
- where required. */
-
-static void ochar(int c)
-{
- if (linelength >= LINELEN) {
- if (fputs(eol, fo) == EOF) {
- exit(1);
- }
- linelength = 0;
- }
- if (putc(((byte) c), fo) == EOF) {
- exit(1);
- }
- linelength++;
-}
-
-/* ENCODE -- Encode binary file into base64. */
-
-static void encode(void)
-{
- int i, hiteof = FALSE;
-
- /* Fill dtable with character encodings. */
-
- for (i = 0; i < 26; i++) {
- dtable[i] = 'A' + i;
- dtable[26 + i] = 'a' + i;
- }
- for (i = 0; i < 10; i++) {
- dtable[52 + i] = '0' + i;
- }
- dtable[62] = '+';
- dtable[63] = '/';
-
- while (!hiteof) {
- byte igroup[3], ogroup[4];
- int c, n;
-
- igroup[0] = igroup[1] = igroup[2] = 0;
- for (n = 0; n < 3; n++) {
- c = inchar();
- if (c == EOF) {
- hiteof = TRUE;
- break;
- }
- igroup[n] = (byte) c;
- }
- if (n > 0) {
- ogroup[0] = dtable[igroup[0] >> 2];
- ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
- ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
- ogroup[3] = dtable[igroup[2] & 0x3F];
-
- /* Replace characters in output stream with "=" pad
- characters if fewer than three characters were
- read from the end of the input stream. */
-
- if (n < 3) {
- ogroup[3] = '=';
- if (n < 2) {
- ogroup[2] = '=';
- }
- }
- for (i = 0; i < 4; i++) {
- ochar(ogroup[i]);
- }
- }
- }
- if (fputs(eol, fo) == EOF) {
- exit(1);
- }
-}
-
-/* INSIG -- Return next significant input */
-
-static int insig(void)
-{
- int c;
-
- /*CONSTANTCONDITION*/
- while (TRUE) {
- c = inchar();
- if (c == EOF || (c > ' ')) {
- return c;
- }
- }
- /*NOTREACHED*/
-}
-
-/* DECODE -- Decode base64. */
-
-static void decode(void)
-{
- int i;
-
- for (i = 0; i < 255; i++) {
- dtable[i] = 0x80;
- }
- for (i = 'A'; i <= 'Z'; i++) {
- dtable[i] = 0 + (i - 'A');
- }
- for (i = 'a'; i <= 'z'; i++) {
- dtable[i] = 26 + (i - 'a');
- }
- for (i = '0'; i <= '9'; i++) {
- dtable[i] = 52 + (i - '0');
- }
- dtable['+'] = 62;
- dtable['/'] = 63;
- dtable['='] = 0;
-
- /*CONSTANTCONDITION*/
- while (TRUE) {
- byte a[4], b[4], o[3];
-
- for (i = 0; i < 4; i++) {
- int c = insig();
-
- if (c == EOF) {
- if (errcheck && (i > 0)) {
- fprintf(stderr, "Input file incomplete.\n");
- exit(1);
- }
- return;
- }
- if (dtable[c] & 0x80) {
- if (errcheck) {
- fprintf(stderr, "Illegal character '%c' in input file.\n", c);
- exit(1);
- }
- /* Ignoring errors: discard invalid character. */
- i--;
- continue;
- }
- a[i] = (byte) c;
- b[i] = (byte) dtable[c];
- }
- o[0] = (b[0] << 2) | (b[1] >> 4);
- o[1] = (b[1] << 4) | (b[2] >> 2);
- o[2] = (b[2] << 6) | b[3];
- i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3);
- if (fwrite(o, i, 1, fo) == EOF) {
- exit(1);
- }
- if (i < 3) {
- return;
- }
- }
-}
-
-/* USAGE -- Print how-to-call information. */
-
-static void usage(char *pname)
-{
- fprintf(stderr, "%s -- Encode/decode file as base64. Call:\n", pname);
- fprintf(stderr,
- " %s [-e[ncode] / -d[ecode]] [-n] [infile] [outfile]\n", pname);
- fprintf(stderr, "\n");
- fprintf(stderr, "Options:\n");
- fprintf(stderr, " -D Decode base64 encoded file\n");
- fprintf(stderr, " -E Encode file into base64\n");
- fprintf(stderr, " -N Ignore errors when decoding\n");
- fprintf(stderr, " -U Print this message\n");
- fprintf(stderr, "\n");
- fprintf(stderr, "by John Walker\n");
- fprintf(stderr, " WWW: http://www.fourmilab.ch/\n");
-}
-
-/* Main program */
-
-int main(int argc, char *argv[])
-{
- int i, f = 0, decoding = FALSE;
- char *cp, opt;
-
- fi = stdin;
- fo = stdout;
-
- for (i = 1; i < argc; i++) {
- cp = argv[i];
- if (*cp == '-') {
- opt = *(++cp);
- if (islower(opt)) {
- opt = toupper(opt);
- }
- switch (opt) {
-
- case 'D': /* -D Decode */
- decoding = TRUE;
- break;
-
- case 'E': /* -E Encode */
- decoding = FALSE;
- break;
-
- case 'N': /* -N Suppress error checking */
- errcheck = FALSE;
- break;
-
- case 'U': /* -U Print how-to-call information */
- case '?':
- usage(argv[0]);
- return 0;
- }
- } else {
- switch (f) {
-
- /** Warning! On systems which distinguish text mode and
- binary I/O (MS-DOS, Macintosh, etc.) the modes in these
- open statements will have to be made conditional based
- upon whether an encode or decode is being done, which
- will have to be specified earlier. But it's worse: if
- input or output is from standard input or output, the
- mode will have to be changed on the fly, which is
- generally system and compiler dependent. 'Twasn't me
- who couldn't conform to Unix CR/LF convention, so
- don't ask me to write the code to work around
- Apple and Microsoft's incompatible standards. **/
-
- case 0:
- if (strcmp(cp, "-") != 0) {
- if ((fi = fopen(cp, "r")) == NULL) {
- fprintf(stderr, "Cannot open input file %s\n", cp);
- return 2;
- }
- }
- f++;
- break;
-
- case 1:
- if (strcmp(cp, "-") != 0) {
- if ((fo = fopen(cp, "w")) == NULL) {
- fprintf(stderr, "Cannot open output file %s\n", cp);
- return 2;
- }
- }
- f++;
- break;
-
- default:
- fprintf(stderr, "Too many file names specified.\n");
- usage(argv[0]);
- return 2;
- }
- }
- }
-
- if (decoding) {
- decode();
- } else {
- encode();
- }
- return 0;
-}
projects / citadel.git / commitdiff