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- /* Copyright (C) 2002-2005 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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