2 goat3d - 3D scene, and animation file format library.
3 Copyright (C) 2013-2023 John Tsiombikas <nuclear@member.fsf.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 static int b64bits(int c);
23 int calc_b64_size(const char *s)
26 const char *end = s + len;
27 while(end > s && *--end == '=') len--;
32 GOAT3DAPI void *goat3d_b64decode(const char *str, void *buf, int *bufsz)
34 unsigned char *dest, *end;
42 sz = calc_b64_size(str);
43 if(!(buf = malloc(sz))) {
46 if(bufsz) *bufsz = sz;
49 end = (unsigned char*)buf + sz;
55 if((bits = b64bits(*str++)) == -1) {
64 if(dest < end) *dest = acc | (bits >> 4);
69 if(dest < end) *dest = acc | (bits >> 2);
74 if(dest < end) *dest = acc | bits;
82 if(dest < end) *dest = acc;
86 if(bufsz) *bufsz = dest - (unsigned char*)buf;
90 static int b64bits(int c)
92 if(c >= 'A' && c <= 'Z') {
95 if(c >= 'a' && c <= 'z') {
98 if(c >= '0' && c <= '9') {
101 if(c == '+') return 62;
102 if(c == '/') return 63;
107 GOAT3DAPI void goat3d_bswap32(void *buf, int count)
113 for(i=0; i<count; i++) {
115 *ptr++ = (x >> 24) | (x << 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000);