1/* base32.h -- Encode binary data using printable characters. 2 Copyright (C) 2004-2006, 2009-2014 Free Software Foundation, Inc. 3 Adapted from Simon Josefsson's base64 code by Gijs van Tulder. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, see <http://www.gnu.org/licenses/>. */ 17 18#ifndef BASE32_H 19# define BASE32_H 20 21/* Get size_t. */ 22# include <stddef.h> 23 24/* Get bool. */ 25# include <stdbool.h> 26 27/* This uses that the expression (n+(k-1))/k means the smallest 28 integer >= n/k, i.e., the ceiling of n/k. */ 29# define BASE32_LENGTH(inlen) ((((inlen) + 4) / 5) * 8) 30 31struct base32_decode_context 32{ 33 unsigned int i; 34 char buf[8]; 35}; 36 37extern bool isbase32 (char ch); 38 39extern void base32_encode (const char *restrict in, size_t inlen, 40 char *restrict out, size_t outlen); 41 42extern size_t base32_encode_alloc (const char *in, size_t inlen, char **out); 43 44extern void base32_decode_ctx_init (struct base32_decode_context *ctx); 45 46extern bool base32_decode_ctx (struct base32_decode_context *ctx, 47 const char *restrict in, size_t inlen, 48 char *restrict out, size_t *outlen); 49 50extern bool base32_decode_alloc_ctx (struct base32_decode_context *ctx, 51 const char *in, size_t inlen, 52 char **out, size_t *outlen); 53 54#define base32_decode(in, inlen, out, outlen) \ 55 base32_decode_ctx (NULL, in, inlen, out, outlen) 56 57#define base32_decode_alloc(in, inlen, out, outlen) \ 58 base32_decode_alloc_ctx (NULL, in, inlen, out, outlen) 59 60#endif /* BASE32_H */ 61