| Constantin Kaplinsky | a2adc8d | 2006-05-25 05:01:55 +0000 | [diff] [blame] | 1 | /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved. |
| 2 | * |
| 3 | * This is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This software is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this software; if not, write to the Free Software |
| 15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 16 | * USA. |
| 17 | */ |
| 18 | |
| 19 | #ifndef __RDR_SUBSTITUTINGINSTREAM_H__ |
| 20 | #define __RDR_SUBSTITUTINGINSTREAM_H__ |
| 21 | |
| 22 | #include <rdr/InStream.h> |
| 23 | #include <rdr/Exception.h> |
| 24 | |
| 25 | namespace rdr { |
| 26 | |
| 27 | class Substitutor { |
| 28 | public: |
| 29 | virtual char* substitute(const char* varName) = 0; |
| 30 | }; |
| 31 | |
| 32 | class SubstitutingInStream : public InStream { |
| 33 | public: |
| 34 | SubstitutingInStream(InStream* underlying_, Substitutor* s, |
| 35 | int maxVarNameLen_) |
| 36 | : underlying(underlying_), dollar(0), substitutor(s), subst(0), |
| 37 | maxVarNameLen(maxVarNameLen_) |
| 38 | { |
| 39 | ptr = end = underlying->getptr(); |
| 40 | varName = new char[maxVarNameLen+1]; |
| 41 | } |
| 42 | ~SubstitutingInStream() { |
| 43 | delete underlying; |
| 44 | delete [] varName; |
| 45 | delete [] subst; |
| 46 | } |
| 47 | |
| 48 | int pos() { return underlying->pos(); } |
| 49 | |
| 50 | virtual int overrun(int itemSize, int nItems, bool wait=true) { |
| 51 | if (itemSize != 1) |
| 52 | throw new rdr::Exception("SubstitutingInStream: itemSize must be 1"); |
| 53 | |
| 54 | if (subst) { |
| 55 | delete [] subst; |
| 56 | subst = 0; |
| 57 | } else { |
| 58 | underlying->setptr(ptr); |
| 59 | } |
| 60 | |
| 61 | underlying->check(1); |
| 62 | ptr = underlying->getptr(); |
| 63 | end = underlying->getend(); |
| 64 | dollar = (const U8*)memchr(ptr, '$', end-ptr); |
| 65 | if (dollar) { |
| 66 | if (dollar == ptr) { |
| 67 | try { |
| 68 | int i = 0; |
| 69 | while (i < maxVarNameLen) { |
| 70 | varName[i++] = underlying->readS8(); |
| 71 | varName[i] = 0; |
| 72 | subst = substitutor->substitute(varName); |
| 73 | if (subst) { |
| 74 | ptr = (U8*)subst; |
| 75 | end = (U8*)subst + strlen(subst); |
| 76 | break; |
| 77 | } |
| 78 | } |
| 79 | } catch (EndOfStream&) { |
| 80 | } |
| 81 | |
| 82 | if (!subst) |
| 83 | dollar = (const U8*)memchr(ptr+1, '$', end-ptr-1); |
| 84 | } |
| 85 | if (!subst && dollar) end = dollar; |
| 86 | } |
| 87 | |
| 88 | if (itemSize * nItems > end - ptr) |
| 89 | nItems = (end - ptr) / itemSize; |
| 90 | |
| 91 | return nItems; |
| 92 | } |
| 93 | |
| 94 | InStream* underlying; |
| 95 | const U8* dollar; |
| 96 | Substitutor* substitutor; |
| 97 | char* varName; |
| 98 | char* subst; |
| 99 | int maxVarNameLen; |
| 100 | }; |
| 101 | } |
| 102 | #endif |