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/*
* Baltisot
* Copyright (C) 1999-2009 Nicolas "Pixel" Noble
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <Base85.h>
// Banned chars: ",/:.[\]
// EOF marker: ~
static char cb85[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!#$%&'()*+-;<=>?@^_`{|}";
static char lookup[] = {
// x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
0, 62, 0, 63, 64, 65, 66, 67, 68, 69, 70, 71, 0, 72, 0, 0, // 2x
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 73, 74, 75, 76, 77, // 3x
78, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 4x
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 79, 80, // 5x
81, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 6x
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 82, 83, 84, 0, 0, // 7x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
};
String Base85::encode_block(unsigned char in_tab[4], int len) {
unsigned int tuple;
char r[6];
tuple = in_tab[0];
tuple |= in_tab[1] << 8;
tuple |= in_tab[2] << 16;
tuple |= in_tab[3] << 24;
r[0] = cb85[tuple % 85];
tuple /= 85;
r[1] = cb85[tuple % 85];
tuple /= 85;
r[2] = len > 1 ? cb85[tuple % 85] : '~';
tuple /= 85;
r[3] = len > 2 ? cb85[tuple % 85] : '~';
tuple /= 85;
r[4] = len > 3 ? cb85[tuple % 85] : '~';
r[5] = 0;
return r;
}
String Base85::encode(const char * data, int stream_size) {
String encoded = "";
unsigned char in_tab[4];
int len, i, s_pos;
s_pos = 0;
while (stream_size > 0) {
in_tab[0] = 0;
in_tab[1] = 0;
in_tab[2] = 0;
in_tab[3] = 0;
len = stream_size >= 4 ? 4 : stream_size;
for (i = 0; i < len; i++) {
in_tab[i] = data[s_pos + i];
}
encoded += encode_block(in_tab, len);
s_pos += 4;
stream_size -= 4;
}
return encoded;
}
int Base85::decode_block(char s1, char s2, char s3, char s4, char s5, unsigned char * out_tab) {
int len, sb1, sb2, sb3, sb4, sb5;
unsigned int tuple;
len = s3 == '~' ? 1 : s4 == '~' ? 2 : s5 == '~' ? 3 : 4;
s3 = (s3 == '~') || (s3 == 0) ? 0 : s3;
s4 = (s4 == '~') || (s4 == 0) ? 0 : s4;
s5 = (s5 == '~') || (s5 == 0) ? 0 : s5;
sb1 = lookup[s1];
sb2 = lookup[s2];
sb3 = lookup[s3];
sb4 = lookup[s4];
sb5 = lookup[s5];
tuple = sb5; tuple *= 85;
tuple += sb4; tuple *= 85;
tuple += sb3; tuple *= 85;
tuple += sb2; tuple *= 85;
tuple += sb1;
out_tab[0] = tuple & 255; tuple >>= 8;
out_tab[1] = tuple & 255; tuple >>= 8;
out_tab[2] = tuple & 255; tuple >>= 8;
out_tab[3] = tuple & 255;
return len;
}
unsigned char * Base85::decode(const String & str_in, int * len_out) {
int s_len = str_in.strlen(), len = 0, i, j, t_len;
char s1, s2, s3, s4, s5;
unsigned char t_out[4];
unsigned char * out = (unsigned char *) malloc(s_len * 4 / 5 + 5);
unsigned char * p = out;
for (i = 0; i < s_len; i += 5) {
s1 = str_in[i + 0];
s2 = str_in[i + 1];
s3 = str_in[i + 2];
s4 = str_in[i + 3];
s5 = str_in[i + 4];
t_len = decode_block(s1, s2, s3, s4, s5, t_out);
for (j = 0; j < t_len; j++) {
*(p++) = t_out[j];
}
len += t_len;
}
if (len_out) {
*len_out = len;
}
return out;
}
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