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annotate lib/base64.h @ 10090:8ea8f3be5116

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Sync gnulib base64 with coreutils base64. * lib/base64.c (base64_decode_ctx): If a decode context structure was passed in use it to ignore newlines. If a context structure was _not_ passed in, continue to treat newlines as garbage (this is the historical behavior). Formerly base64_decode. (base64_decode_alloc_ctx): Formerly base64_decode_alloc. Now takes a decode context structure. * lib/base64.h (base64_decode): Macro for four-argument calls. (base64_decode_alloc): Likewise. * lib/base64.c (base64_decode_ctx): If a decode context structure was passed in use it to ignore newlines. If a context structure was _not_ passed in, continue to treat newlines as garbage (this is the historical behavior). Formerly base64_decode. (base64_decode_alloc_ctx): Formerly base64_decode_alloc. Now takes a decode context structure. * lib/base64.h (base64_decode): Macro for four-argument calls. (base64_decode_alloc): Likewise.
author Simon Josefsson <simon@josefsson.org>
date Mon, 19 May 2008 19:32:00 +0200
parents ca817b50a17f
children e8d2c6fc33ad
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1 /* base64.h -- Encode binary data using printable characters.
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2 Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
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3 Written by Simon Josefsson.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 #ifndef BASE64_H
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20 # define BASE64_H
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21
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22 /* Get size_t. */
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23 # include <stddef.h>
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25 /* Get bool. */
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26 # include <stdbool.h>
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27
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28 /* This uses that the expression (n+(k-1))/k means the smallest
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29 integer >= n/k, i.e., the ceiling of n/k. */
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30 # define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
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31
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32 struct base64_decode_context
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33 {
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34 unsigned int i;
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35 char buf[4];
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36 };
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37
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38 extern bool isbase64 (char ch);
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39
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40 extern void base64_encode (const char *restrict in, size_t inlen,
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41 char *restrict out, size_t outlen);
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42
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43 extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
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45 extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
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46
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47 extern bool base64_decode_ctx (struct base64_decode_context *ctx,
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48 const char *restrict in, size_t inlen,
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49 char *restrict out, size_t *outlen);
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51 extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
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52 const char *in, size_t inlen,
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53 char **out, size_t *outlen);
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54
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55 #define base64_decode(in, inlen, out, outlen) \
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56 base64_decode_ctx (NULL, in, inlen, out, outlen)
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57
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58 #define base64_decode_alloc(in, inlen, out, outlen) \
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59 base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
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61 #endif /* BASE64_H */