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@@ -0,0 +1,103 @@
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+/*
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+ * base64 encoding / decoding
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+ *
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+ * $Id$
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+ *
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+ * Copyright (C) 2001-2003 FhG Fokus
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+ *
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+ * This file is part of ser, a free SIP server.
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+ *
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+ * ser is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version
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+ *
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+ * For a license to use the ser software under conditions
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+ * other than those described here, or to purchase support for this
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+ * software, please contact iptel.org by e-mail at the following addresses:
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+ * [email protected]
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+ *
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+ * ser is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+void base64decode(char* src_buf, int src_len, char* tgt_buf, int* tgt_len) {
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+ int pos, i, n;
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+ unsigned char c[4];
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+ for (pos=0, i=0, *tgt_len=0; pos < src_len; pos++) {
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+ if (src_buf[pos] >= 'A' && src_buf[pos] <= 'Z')
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+ c[i] = src_buf[pos] - 65; /* <65..90> --> <0..25> */
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+ else if (src_buf[pos] >= 'a' && src_buf[pos] <= 'z')
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+ c[i] = src_buf[pos] - 71; /* <97..122> --> <26..51> */
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+ else if (src_buf[pos] >= '0' && src_buf[pos] <= '9')
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+ c[i] = src_buf[pos] + 4; /* <48..56> --> <52..61> */
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+ else if (src_buf[pos] == '+')
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+ c[i] = 62;
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+ else if (src_buf[pos] == '/')
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+ c[i] = 63;
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+ else /* '=' */
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+ c[i] = 64;
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+ i++;
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+ if (pos == src_len-1) {
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+ while (i < 4) {
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+ c[i] = 64;
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+ i++;
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+ }
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+ }
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+ if (i==4) {
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+ if (c[0] == 64)
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+ n = 0;
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+ else if (c[2] == 64)
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+ n = 1;
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+ else if (c[3] == 64)
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+ n = 2;
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+ else
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+ n = 3;
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+ switch (n) {
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+ case 3:
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+ tgt_buf[*tgt_len+2] = (char) (((c[2] & 0x03) << 6) | c[3]);
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+ /* no break */
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+ case 2:
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+ tgt_buf[*tgt_len+1] = (char) (((c[1] & 0x0F) << 4) | (c[2] >> 2));
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+ /* no break */
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+ case 1:
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+ tgt_buf[*tgt_len+0] = (char) ((c[0] << 2) | (c[1] >> 4));
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+ break;
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+ }
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+ i=0;
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+ *tgt_len+= n;
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+ }
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+ }
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+}
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+
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+void base64encode(char* src_buf, int src_len, char* tgt_buf, int* tgt_len, int quoted) {
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+ static char code64[64+1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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+ int pos;
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+ for (pos=0, *tgt_len=0; pos < src_len; pos+=3,*tgt_len+=4) {
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+ tgt_buf[*tgt_len+0] = code64[(unsigned char)src_buf[pos+0] >> 2];
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+ tgt_buf[*tgt_len+1] = code64[(((unsigned char)src_buf[pos+0] & 0x03) << 4) | ((pos+1 < src_len)?((unsigned char)src_buf[pos+1] >> 4):0)];
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+ if (pos+1 < src_len)
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+ tgt_buf[*tgt_len+2] = code64[(((unsigned char)src_buf[pos+1] & 0x0F) << 2) | ((pos+2 < src_len)?((unsigned char)src_buf[pos+2] >> 6):0)];
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+ else {
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+ if(!quoted)
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+ (*tgt_len)--;
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+ else
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+ /* this data is going to be quoted */
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+ tgt_buf[*tgt_len+2] = '=';
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+ }
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+ if (pos+2 < src_len)
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+ tgt_buf[*tgt_len+3] = code64[(unsigned char)src_buf[pos+2] & 0x3F];
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+ else {
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+ if(!quoted)
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+ (*tgt_len)--;
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+ else
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+ tgt_buf[*tgt_len+3] = '=';
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+ }
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+ }
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+}
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Jan Janak