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/* Copyright (C) 2002-2004 RealVNC Ltd. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifndef __RDR_SUBSTITUTINGINSTREAM_H__
#define __RDR_SUBSTITUTINGINSTREAM_H__
#include <rdr/InStream.h>
#include <rdr/Exception.h>
namespace rdr {
class Substitutor {
public:
virtual char* substitute(const char* varName) = 0;
};
class SubstitutingInStream : public InStream {
public:
SubstitutingInStream(InStream* underlying_, Substitutor* s,
int maxVarNameLen_)
: underlying(underlying_), dollar(0), substitutor(s), subst(0),
maxVarNameLen(maxVarNameLen_)
{
ptr = end = underlying->getptr();
varName = new char[maxVarNameLen+1];
}
~SubstitutingInStream() {
delete underlying;
delete [] varName;
delete [] subst;
}
int pos() { return underlying->pos(); }
virtual int overrun(int itemSize, int nItems, bool wait=true) {
if (itemSize != 1)
throw new rdr::Exception("SubstitutingInStream: itemSize must be 1");
if (subst) {
delete [] subst;
subst = 0;
} else {
underlying->setptr(ptr);
}
underlying->check(1);
ptr = underlying->getptr();
end = underlying->getend();
dollar = (const U8*)memchr(ptr, '$', end-ptr);
if (dollar) {
if (dollar == ptr) {
try {
int i = 0;
while (i < maxVarNameLen) {
varName[i++] = underlying->readS8();
varName[i] = 0;
subst = substitutor->substitute(varName);
if (subst) {
ptr = (U8*)subst;
end = (U8*)subst + strlen(subst);
break;
}
}
} catch (EndOfStream&) {
}
if (!subst)
dollar = (const U8*)memchr(ptr+1, '$', end-ptr-1);
}
if (!subst && dollar) end = dollar;
}
if (itemSize * nItems > end - ptr)
nItems = (end - ptr) / itemSize;
return nItems;
}
InStream* underlying;
const U8* dollar;
Substitutor* substitutor;
char* varName;
char* subst;
int maxVarNameLen;
};
}
#endif
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