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/*************************************************************************
*
* HTCd - Copyright (C) 1998-2006 Henrik Rydberg
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <mime/enc.h>
#include <mime/pack.h>
#include <algorithm>
const charset special("=\"#$\\^`{|}~");
//const charset special("=!\"#$@[\\]^`{|}~");
const charset headspecial("_?");
const charset printable=cset_printable&~special;
const charset printhead=printable&~headspecial;
const mstring beg_tag("=?"),end_tag("?=");
const mstring enc_qp_tag("Q"),enc_64_tag("B");
const int WRAPAT=76;
const int HEADWRAP=WRAPAT-7;
void decodeQP(mstream& out,const sref& in)
{
const char* p=in.begin();
while(p<in.end()) {
unsigned char c=*p++;
if(c=='=') {
if(cset_ws.test(*p)) p=in(p).past_nl().data();
else {
unsigned char c1=*p++,c2=*p++;
out.put(hexasc(c1,c2));
}
}
else out.put(c);
}
}
void encodeQP(mstream& out,const sref& in)
{
sref first,rest=in;
while(Splitln(first,rest)) {
int n=0;
const char* p=first.begin();
while(p<first.end()) {
unsigned char c=*p++;
if(printable.test(c)) {
if(first(p).empty()&&cset_spaces.test(c)) { cashex(out.put('='),c); n+=3; }
else { out.put(c); n++; }
}
else { cashex(out.put('='),c); n+=3; }
if(first(p).nempty()&&n>=WRAPAT) { out.put('=')<<CRLF; n=0; }
}
out<<CRLF;
}
}
static void decodeHQ(mstream& out,const sref& in)
{
const char* p=in.begin();
while(p<in.end()) {
unsigned char c=*p++;
if(c=='=') {
unsigned char c1=*p++,c2=*p++;
out.put(hexasc(c1,c2));
}
else if(c=='_') out.put(' ');
else out.put(c);
}
}
static int encodeHQ(mstream& out,const sref& in)
{
int enc=0;
const char* p=in.begin();
while(p<in.end()) {
unsigned char c=*p++;
if(!printable.test(c)) enc=1;
if(printhead.test(c)) { if(c==32) out.put('_'); else out.put(c); }
else cashex(out.put('='),c);
}
return enc;
}
void decodeHeader(mstream& out,mstring& mime,const sref& in)
{
sref e,p=in;
while(p.nempty()) {
p=p.adv(e=p.left_first(beg_tag));
out<<e;
if(p.nempty()) {
p=p.adv(beg_tag.size());
mime=p.left_first('?');
p=p.adv(mime.size());
if(p.empty()) { out<<beg_tag<<mime; p.clear(); }
else {
p=p.popf();
sref enc=p.left_first('?');
p=p.adv(enc);
if(p.empty()) { out<<beg_tag<<mime<<"?"<<enc; p.clear(); }
else {
p=p.adv(e=p.popf().left_first(end_tag));
if(p.empty()) { out<<beg_tag<<mime<<"?"<<enc<<"?"<<e; p.clear(); }
else {
p=p.adv(end_tag.size());
if(eqn(enc,enc_qp_tag)) decodeHQ(out,e);
else if(eqn(enc,enc_64_tag)) decode64(out,e);
else out<<"BAD: ["<<mime<<"]["<<enc<<"]["<<e<<"]";
}
}
}
}
}
}
void encodeHeader(mstream& out,const sref& mime,const sref& in)
{
mstring tmp;
swrite sw(tmp);
if(encodeHQ(sw,in)) {
int wrapat=HEADWRAP-mime.size();
sref e,p=tmp;
p=p.adv(e=p.left(std::min(wrapat,p.size())));
out<<beg_tag<<mime<<"?Q?"<<e<<end_tag;
while(p.nempty()) {
p=p.adv(e=p.left(std::min(wrapat,p.size())));
out<<"\r\n\t"<<beg_tag<<mime<<"?Q?"<<e<<end_tag;
}
}
else {
sref e,p=in;
p=p.adv(e=p.left(std::min(WRAPAT,p.size())));
out<<e;
while(p.nempty()) {
p=p.adv(e=p.left(std::min(WRAPAT,p.size())));
out<<"\r\n\t"<<e;
}
}
}
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