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-/* $OpenBSD: base64.c,v 1.5 2006/10/21 09:55:03 otto Exp $ */
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-
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-/*
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- * Copyright (c) 1996 by Internet Software Consortium.
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- *
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- * Permission to use, copy, modify, and distribute this software for any
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- * purpose with or without fee is hereby granted, provided that the above
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- * copyright notice and this permission notice appear in all copies.
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- *
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- * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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- * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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- * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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- * SOFTWARE.
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- */
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-
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-/*
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- * Portions Copyright (c) 1995 by International Business Machines, Inc.
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- *
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- * International Business Machines, Inc. (hereinafter called IBM) grants
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- * permission under its copyrights to use, copy, modify, and distribute this
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- * Software with or without fee, provided that the above copyright notice and
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- * all paragraphs of this notice appear in all copies, and that the name of IBM
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- * not be used in connection with the marketing of any product incorporating
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- * the Software or modifications thereof, without specific, written prior
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- * permission.
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- *
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- * To the extent it has a right to do so, IBM grants an immunity from suit
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- * under its patents, if any, for the use, sale or manufacture of products to
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- * the extent that such products are used for performing Domain Name System
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- * dynamic updates in TCP/IP networks by means of the Software. No immunity is
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- * granted for any product per se or for any other function of any product.
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- *
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- * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
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- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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- * PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
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- * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
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- * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
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- * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
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- */
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-
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-/* OPENBSD ORIGINAL: lib/libc/net/base64.c */
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-
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-
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-#if (!defined(HAVE_B64_NTOP) && !defined(HAVE___B64_NTOP)) || (!defined(HAVE_B64_PTON) && !defined(HAVE___B64_PTON))
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-
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-#include <sys/types.h>
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-#include <sys/param.h>
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-#include <sys/socket.h>
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-#include <netinet/in.h>
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-#include <arpa/inet.h>
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-
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-#include <ctype.h>
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-#include <stdio.h>
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-
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-#include <stdlib.h>
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-#include <string.h>
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-
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-#include "base64.h"
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-
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-static const char Base64[] =
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-"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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-static const char Pad64 = '=';
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-
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-/* (From RFC1521 and draft-ietf-dnssec-secext-03.txt)
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- The following encoding technique is taken from RFC 1521 by Borenstein
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- and Freed. It is reproduced here in a slightly edited form for
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- convenience.
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-
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- A 65-character subset of US-ASCII is used, enabling 6 bits to be
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- represented per printable character. (The extra 65th character, "=",
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- is used to signify a special processing function.)
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-
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- The encoding process represents 24-bit groups of input bits as output
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- strings of 4 encoded characters. Proceeding from left to right, a
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- 24-bit input group is formed by concatenating 3 8-bit input groups.
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- These 24 bits are then treated as 4 concatenated 6-bit groups, each
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- of which is translated into a single digit in the base64 alphabet.
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-
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- Each 6-bit group is used as an index into an array of 64 printable
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- characters. The character referenced by the index is placed in the
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- output string.
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-
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- Table 1: The Base64 Alphabet
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-
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- Value Encoding Value Encoding Value Encoding Value Encoding
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- 0 A 17 R 34 i 51 z
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- 1 B 18 S 35 j 52 0
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- 2 C 19 T 36 k 53 1
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- 3 D 20 U 37 l 54 2
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- 4 E 21 V 38 m 55 3
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- 5 F 22 W 39 n 56 4
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- 6 G 23 X 40 o 57 5
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- 7 H 24 Y 41 p 58 6
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- 8 I 25 Z 42 q 59 7
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- 9 J 26 a 43 r 60 8
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- 10 K 27 b 44 s 61 9
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- 11 L 28 c 45 t 62 +
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- 12 M 29 d 46 u 63 /
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- 13 N 30 e 47 v
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- 14 O 31 f 48 w (pad) =
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- 15 P 32 g 49 x
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- 16 Q 33 h 50 y
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-
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- Special processing is performed if fewer than 24 bits are available
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- at the end of the data being encoded. A full encoding quantum is
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- always completed at the end of a quantity. When fewer than 24 input
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- bits are available in an input group, zero bits are added (on the
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- right) to form an integral number of 6-bit groups. Padding at the
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- end of the data is performed using the '=' character.
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-
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- Since all base64 input is an integral number of octets, only the
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- -------------------------------------------------
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- following cases can arise:
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-
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- (1) the final quantum of encoding input is an integral
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- multiple of 24 bits; here, the final unit of encoded
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- output will be an integral multiple of 4 characters
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- with no "=" padding,
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- (2) the final quantum of encoding input is exactly 8 bits;
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- here, the final unit of encoded output will be two
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- characters followed by two "=" padding characters, or
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- (3) the final quantum of encoding input is exactly 16 bits;
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- here, the final unit of encoded output will be three
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- characters followed by one "=" padding character.
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- */
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-
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-#if !defined(HAVE_B64_NTOP) && !defined(HAVE___B64_NTOP)
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-int
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-b64_ntop(u_char const *src, size_t srclength, char *target, size_t targsize)
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-{
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- size_t datalength = 0;
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- u_char input[3];
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- u_char output[4];
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- u_int i;
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-
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- while (2 < srclength) {
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- input[0] = *src++;
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- input[1] = *src++;
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- input[2] = *src++;
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- srclength -= 3;
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-
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- output[0] = input[0] >> 2;
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- output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);
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- output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);
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- output[3] = input[2] & 0x3f;
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-
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- if (datalength + 4 > targsize)
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- return (-1);
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- target[datalength++] = Base64[output[0]];
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- target[datalength++] = Base64[output[1]];
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- target[datalength++] = Base64[output[2]];
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- target[datalength++] = Base64[output[3]];
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- }
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-
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- /* Now we worry about padding. */
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- if (0 != srclength) {
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- /* Get what's left. */
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- input[0] = input[1] = input[2] = '\0';
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- for (i = 0; i < srclength; i++)
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- input[i] = *src++;
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-
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- output[0] = input[0] >> 2;
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- output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);
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- output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);
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-
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- if (datalength + 4 > targsize)
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- return (-1);
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- target[datalength++] = Base64[output[0]];
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- target[datalength++] = Base64[output[1]];
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- if (srclength == 1)
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- target[datalength++] = Pad64;
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- else
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- target[datalength++] = Base64[output[2]];
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- target[datalength++] = Pad64;
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- }
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- if (datalength >= targsize)
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- return (-1);
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- target[datalength] = '\0'; /* Returned value doesn't count \0. */
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- return (datalength);
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-}
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-#endif /* !defined(HAVE_B64_NTOP) && !defined(HAVE___B64_NTOP) */
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-
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-#if !defined(HAVE_B64_PTON) && !defined(HAVE___B64_PTON)
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-
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-/* skips all whitespace anywhere.
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- converts characters, four at a time, starting at (or after)
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- src from base - 64 numbers into three 8 bit bytes in the target area.
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- it returns the number of data bytes stored at the target, or -1 on error.
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- */
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-
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-int
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-b64_pton(char const *src, u_char *target, size_t targsize)
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-{
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- u_int tarindex, state;
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- int ch;
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- char *pos;
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-
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- state = 0;
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- tarindex = 0;
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-
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- while ((ch = *src++) != '\0') {
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- if (isspace(ch)) /* Skip whitespace anywhere. */
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- continue;
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-
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- if (ch == Pad64)
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- break;
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-
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- pos = strchr(Base64, ch);
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- if (pos == 0) /* A non-base64 character. */
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- return (-1);
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-
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- switch (state) {
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- case 0:
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- if (target) {
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- if (tarindex >= targsize)
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- return (-1);
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- target[tarindex] = (pos - Base64) << 2;
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- }
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- state = 1;
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- break;
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- case 1:
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- if (target) {
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- if (tarindex + 1 >= targsize)
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- return (-1);
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- target[tarindex] |= (pos - Base64) >> 4;
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- target[tarindex+1] = ((pos - Base64) & 0x0f)
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- << 4 ;
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- }
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- tarindex++;
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- state = 2;
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- break;
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- case 2:
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- if (target) {
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- if (tarindex + 1 >= targsize)
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- return (-1);
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- target[tarindex] |= (pos - Base64) >> 2;
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- target[tarindex+1] = ((pos - Base64) & 0x03)
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- << 6;
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- }
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- tarindex++;
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- state = 3;
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- break;
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- case 3:
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- if (target) {
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- if (tarindex >= targsize)
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- return (-1);
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- target[tarindex] |= (pos - Base64);
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- }
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- tarindex++;
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- state = 0;
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- break;
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- }
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- }
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-
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- /*
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- * We are done decoding Base-64 chars. Let's see if we ended
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- * on a byte boundary, and/or with erroneous trailing characters.
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- */
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-
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- if (ch == Pad64) { /* We got a pad char. */
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- ch = *src++; /* Skip it, get next. */
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- switch (state) {
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- case 0: /* Invalid = in first position */
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- case 1: /* Invalid = in second position */
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- return (-1);
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-
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- case 2: /* Valid, means one byte of info */
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- /* Skip any number of spaces. */
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- for (; ch != '\0'; ch = *src++)
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- if (!isspace(ch))
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- break;
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- /* Make sure there is another trailing = sign. */
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- if (ch != Pad64)
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- return (-1);
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- ch = *src++; /* Skip the = */
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- /* Fall through to "single trailing =" case. */
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- /* FALLTHROUGH */
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-
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- case 3: /* Valid, means two bytes of info */
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- /*
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- * We know this char is an =. Is there anything but
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- * whitespace after it?
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- */
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- for (; ch != '\0'; ch = *src++)
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- if (!isspace(ch))
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- return (-1);
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-
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- /*
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- * Now make sure for cases 2 and 3 that the "extra"
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- * bits that slopped past the last full byte were
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- * zeros. If we don't check them, they become a
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- * subliminal channel.
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- */
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- if (target && target[tarindex] != 0)
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- return (-1);
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- }
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- } else {
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- /*
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- * We ended by seeing the end of the string. Make sure we
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- * have no partial bytes lying around.
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- */
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- if (state != 0)
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- return (-1);
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- }
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-
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- return (tarindex);
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-}
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-
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-#endif /* !defined(HAVE_B64_PTON) && !defined(HAVE___B64_PTON) */
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-#endif
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