-/* from imtest.c -- IMAP/IMSP test client
- * Cyrus IMAPd 1.5.2 <URL:ftp://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-imapd-v1.5.2.tar.gz>
+/*
+ * base64.c -- base-64 conversion routines.
*
- * Copyright 1996, Carnegie Mellon University. All Rights Reserved.
- *
- * This software is made available for academic and research
- * purposes only. No commercial license is hereby granted.
- * Copying and other reproduction is authorized only for research,
- * education, and other non-commercial purposes. No warranties,
- * either expressed or implied, are made regarding the operation,
- * use, or results of the software. Such a release does not permit
- * use of the code for commercial purposes or benefits by anyone
- * without specific, additional permission by the owner of the code.
+ * For license terms, see the file COPYING in this directory.
*
- * Author: Chris Newman <chrisn+@cmu.edu>
- * Start Date: 2/16/93
+ * This base 64 encoding is defined in RFC2045 section 6.8,
+ * "Base64 Content-Transfer-Encoding", but lines must not be broken in the
+ * scheme used here.
*/
+#include "config.h"
+#include "fetchmail.h"
+#include <ctype.h>
-/* base64 tables
- */
-static char basis_64[] =
+static const char base64digits[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-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
+
+#define BAD -1
+static const char base64val[] = {
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD, 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,BAD, BAD,BAD,BAD,BAD,
+ BAD, 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,BAD, BAD,BAD,BAD,BAD
};
-#define CHAR64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
+#define DECODE64(c) (isascii((unsigned char)(c)) ? base64val[c] : BAD)
-void to64(out, in, inlen)
- unsigned char *out, *in;
- int inlen;
+void to64frombits(char *out, const void *in_, int inlen)
+/* raw bytes in quasi-big-endian order to base 64 string (NUL-terminated) */
{
- unsigned char oval;
-
- while (inlen >= 3) {
- *out++ = basis_64[in[0] >> 2];
- *out++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
- *out++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
- *out++ = basis_64[in[2] & 0x3f];
+ const unsigned char *in = (const unsigned char *)in_;
+
+ for (; inlen >= 3; inlen -= 3)
+ {
+ *out++ = base64digits[in[0] >> 2];
+ *out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+ *out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+ *out++ = base64digits[in[2] & 0x3f];
in += 3;
- inlen -= 3;
}
- if (inlen > 0) {
- *out++ = basis_64[in[0] >> 2];
- oval = (in[0] << 4) & 0x30;
- if (inlen > 1) oval |= in[1] >> 4;
- *out++ = basis_64[oval];
- *out++ = (inlen < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
+ if (inlen > 0)
+ {
+ unsigned char fragment;
+
+ *out++ = base64digits[in[0] >> 2];
+ fragment = (in[0] << 4) & 0x30;
+ if (inlen > 1)
+ fragment |= in[1] >> 4;
+ *out++ = base64digits[fragment];
+ *out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
*out++ = '=';
}
*out = '\0';
}
-int from64(out, in)
- char *out, *in;
+int from64tobits(void *out_, const char *in, int maxlen)
+/* base 64 to raw bytes in quasi-big-endian order, returning count of bytes */
+/* maxlen limits output buffer size, set to zero to ignore */
{
int len = 0;
- int c1, c2, c3, c4;
+ register unsigned char digit1, digit2, digit3, digit4;
+ unsigned char *out = (unsigned char *)out_;
+
+ if (in[0] == '+' && in[1] == ' ')
+ in += 2;
+ if (*in == '\r')
+ return(0);
- if (in[0] == '+' && in[1] == ' ') in += 2;
- if (*in == '\r') return (0);
do {
- c1 = in[0];
- if (CHAR64(c1) == -1) return (-1);
- c2 = in[1];
- if (CHAR64(c2) == -1) return (-1);
- c3 = in[2];
- if (c3 != '=' && CHAR64(c3) == -1) return (-1);
- c4 = in[3];
- if (c4 != '=' && CHAR64(c4) == -1) return (-1);
+ digit1 = in[0];
+ if (DECODE64(digit1) == BAD)
+ return(-1);
+ digit2 = in[1];
+ if (DECODE64(digit2) == BAD)
+ return(-1);
+ digit3 = in[2];
+ if (digit3 != '=' && DECODE64(digit3) == BAD)
+ return(-1);
+ digit4 = in[3];
+ if (digit4 != '=' && DECODE64(digit4) == BAD)
+ return(-1);
in += 4;
- *out++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
++len;
- if (c3 != '=') {
- *out++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
+ if (maxlen && len > maxlen)
+ return(-1);
+ *out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4);
+ if (digit3 != '=')
+ {
++len;
- if (c4 != '=') {
- *out++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);
- ++len;
+ if (maxlen && len > maxlen)
+ return(-1);
+ *out++ = ((DECODE64(digit2) << 4) & 0xf0) | (DECODE64(digit3) >> 2);
+ if (digit4 != '=')
+ {
+ ++len;
+ if (maxlen && len > maxlen)
+ return(-1);
+ *out++ = ((DECODE64(digit3) << 6) & 0xc0) | DECODE64(digit4);
}
}
- } while (*in != '\r' && c4 != '=');
+ } while
+ (*in && *in != '\r' && digit4 != '=');
return (len);
}
+/* base64.c ends here */
projects / ~andy / fetchmail / blobdiff