1 /* base32.h -- Encode binary data using printable characters. 2 Copyright (C) 2004-2006, 2009-2021 Free Software Foundation, Inc. 3 Adapted from Simon Josefsson's base64 code by Gijs van Tulder. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file 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 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #ifndef BASE32_H 19 # define BASE32_H 20 21 /* Get idx_t. */ 22 # include <idx.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 31 struct base32_decode_context 32 { 33 int i; 34 char buf[8]; 35 }; 36 37 extern bool isbase32 (char ch) _GL_ATTRIBUTE_CONST; 38 39 extern void base32_encode (const char *restrict in, idx_t inlen, 40 char *restrict out, idx_t outlen); 41 42 extern idx_t base32_encode_alloc (const char *in, idx_t inlen, char **out); 43 44 extern void base32_decode_ctx_init (struct base32_decode_context *ctx); 45 46 extern bool base32_decode_ctx (struct base32_decode_context *ctx, 47 const char *restrict in, idx_t inlen, 48 char *restrict out, idx_t *outlen); 49 50 extern bool base32_decode_alloc_ctx (struct base32_decode_context *ctx, 51 const char *in, idx_t inlen, 52 char **out, idx_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