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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2005 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#define UUDECODE(c) (c=='`' ? 0 : c - ' ')
#define N64(i) (i & ~63)
const char uudigit[64] =
{
'`', '!', '"', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/',
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', ':', ';', '<', '=', '>', '?',
'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '[', '\\', ']', '^', '_'
};
int touufrombits(unsigned char *out, const unsigned char *in, int inlen)
{
int len;
if (inlen > 45) return -1;
len = (inlen * 4 + 2) / 3 + 1;
*out++ = uudigit[inlen];
for (; inlen >= 3; inlen -= 3) {
*out++ = uudigit[in[0] >> 2];
*out++ = uudigit[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*out++ = uudigit[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*out++ = uudigit[in[2] & 0x3f];
in += 3;
}
if (inlen > 0) {
*out++ = uudigit[(in[0] >> 2)];
if (inlen == 1) {
*out++ = uudigit[((in[0] << 4) & 0x30)];
} else {
*out++ = uudigit[(((in[0] << 4) & 0x30) | (in[1] >> 4))] ;
*out++ = uudigit[((in[1] << 2) & 0x3c)];
}
}
*out = '\0';
return len;
}
int fromuutobits(char *out, const char *in)
{
int len, outlen, inlen;
register unsigned char digit1, digit2;
outlen = UUDECODE(in[0]);
in += 1;
if(outlen < 0 || outlen > 45)
return -2;
if(outlen == 0)
return 0;
inlen = (outlen * 4 + 2) / 3;
len = 0;
for( ; inlen>0; inlen-=4) {
digit1 = UUDECODE(in[0]);
if (N64(digit1)) return -1;
digit2 = UUDECODE(in[1]);
if (N64(digit2)) return -1;
out[len++] = (digit1 << 2) | (digit2 >> 4);
if (inlen > 2) {
digit1 = UUDECODE(in[2]);
if (N64(digit1)) return -1;
out[len++] = (digit2 << 4) | (digit1 >> 2);
if (inlen > 3) {
digit2 = UUDECODE(in[3]);
if (N64(digit2)) return -1;
out[len++] = (digit1 << 6) | digit2;
}
}
in += 4;
}
return len == outlen ? len : -3;
}
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