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-rw-r--r--kmicromail/libetpan/tools/base64.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/kmicromail/libetpan/tools/base64.c b/kmicromail/libetpan/tools/base64.c
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+++ b/kmicromail/libetpan/tools/base64.c
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+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2002 - Juergen Graf
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the libEtPan! project nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ */
+
+#include "base64.h"
+
+#include <stdlib.h>
+
+#define OUTPUT_SIZE 513
+#define CHAR64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
+
+static char index_64[128] = {
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+ 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
+ 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
+ -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+ 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+};
+
+static char basis_64[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+char * encode_base64(const char * in, int len)
+{
+ char * output, * tmp;
+ unsigned char oval;
+ int out_len;
+
+ out_len = ((len + 2) / 3 * 4) + 1;
+
+ if ((len > 0) && (in == NULL))
+ return NULL;
+
+ output = malloc(out_len);
+ if (!output)
+ return NULL;
+
+ tmp = output;
+ while (len >= 3) {
+ *tmp++ = basis_64[in[0] >> 2];
+ *tmp++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+ *tmp++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+ *tmp++ = basis_64[in[2] & 0x3f];
+ in += 3;
+ len -= 3;
+ }
+ if (len > 0) {
+ *tmp++ = basis_64[in[0] >> 2];
+ oval = (in[0] << 4) & 0x30;
+ if (len > 1) oval |= in[1] >> 4;
+ *tmp++ = basis_64[oval];
+ *tmp++ = (len < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
+ *tmp++ = '=';
+ }
+
+ *tmp = '\0';
+
+ return output;
+}
+
+char * decode_base64(const char * in, int len)
+{
+ char * output, * out;
+ int i, c1, c2, c3, c4, out_len;
+
+ out_len = 0;
+
+ output = malloc(OUTPUT_SIZE);
+ if (output == NULL)
+ return NULL;
+ out = output;
+
+ if (in[0] == '+' && in[1] == ' ')
+ in += 2;
+
+ for (i = 0; i < (len / 4); i++) {
+ c1 = in[0];
+ c2 = in[1];
+ c3 = in[2];
+ c4 = in[3];
+ if (CHAR64(c1) == -1 || CHAR64(c2) == -1 ||
+ (c3 != '=' && CHAR64(c3) == -1) ||
+ (c4 != '=' && CHAR64(c4) == -1))
+ return NULL;
+
+ in += 4;
+ *output++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
+ if (++out_len >= OUTPUT_SIZE)
+ return NULL;
+
+ if (c3 != '=') {
+ *output++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
+ if (++out_len >= OUTPUT_SIZE)
+ return NULL;
+
+ if (c4 != '=') {
+ *output++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);
+ if (++out_len >= OUTPUT_SIZE)
+ return NULL;
+ }
+ }
+ }
+
+ *output = 0;
+
+ return out;
+}
+
+