-void mutt_decode_base64 (STATE * s, long len, int istext, iconv_t cd)
-{
- char buf[5];
- int c1, c2, c3, c4, ch, cr = 0, i;
- char bufi[BUFI_SIZE];
- ssize_t l = 0;
-
- buf[4] = 0;
-
- if (istext)
- state_set_prefix (s);
-
- while (len > 0) {
- for (i = 0; i < 4 && len > 0; len--) {
- if ((ch = fgetc (s->fpin)) == EOF)
- break;
- if (base64val(ch) >= 0 || ch == '=')
- buf[i++] = ch;
- }
- if (i != 4) {
- debug_print (2, ("didn't get a multiple of 4 chars.\n"));
- break;
- }
-
- c1 = base64val(buf[0]);
- c2 = base64val(buf[1]);
- ch = (c1 << 2) | (c2 >> 4);
-
- if (cr && ch != '\n')
- bufi[l++] = '\r';
-
- cr = 0;
-
- if (istext && ch == '\r')
- cr = 1;
- else
- bufi[l++] = ch;
-
- if (buf[2] == '=')
- break;
- c3 = base64val(buf[2]);
- ch = ((c2 & 0xf) << 4) | (c3 >> 2);
-
- if (cr && ch != '\n')
- bufi[l++] = '\r';
-
- cr = 0;
-
- if (istext && ch == '\r')
- cr = 1;
- else
- bufi[l++] = ch;
-
- if (buf[3] == '=')
- break;
- c4 = base64val(buf[3]);
- ch = ((c3 & 0x3) << 6) | c4;
-
- if (cr && ch != '\n')
- bufi[l++] = '\r';
- cr = 0;
-
- if (istext && ch == '\r')
- cr = 1;
- else
- bufi[l++] = ch;
-
- if (l + 8 >= sizeof (bufi))
- mutt_convert_to_state (cd, bufi, &l, s);
- }
-
- if (cr)
- bufi[l++] = '\r';
-
- mutt_convert_to_state (cd, bufi, &l, s);
- mutt_convert_to_state (cd, 0, 0, s);
-
- state_reset_prefix (s);
-}
-
-unsigned char decode_byte (char ch)