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96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <rdr/HexInStream.h>
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#include <rdr/Exception.h>
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#include <stdlib.h>
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#include <ctype.h>
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using namespace rdr;
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static inline int min(int a, int b) {return a<b ? a : b;}
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HexInStream::HexInStream(InStream& is)
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: in_stream(is)
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{
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}
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HexInStream::~HexInStream() {
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}
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bool HexInStream::readHexAndShift(char c, int* v) {
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c=tolower(c);
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if ((c >= '0') && (c <= '9'))
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*v = (*v << 4) + (c - '0');
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else if ((c >= 'a') && (c <= 'f'))
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*v = (*v << 4) + (c - 'a' + 10);
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else
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return false;
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return true;
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}
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bool HexInStream::hexStrToBin(const char* s, char** data, size_t* length) {
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size_t l=strlen(s);
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if ((l % 2) == 0) {
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delete [] *data;
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*data = 0; *length = 0;
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if (l == 0)
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return true;
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*data = new char[l/2];
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*length = l/2;
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for(size_t i=0;i<l;i+=2) {
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int byte = 0;
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if (!readHexAndShift(s[i], &byte) ||
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!readHexAndShift(s[i+1], &byte))
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goto decodeError;
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(*data)[i/2] = byte;
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}
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return true;
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}
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decodeError:
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delete [] *data;
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*data = 0;
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*length = 0;
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return false;
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}
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bool HexInStream::fillBuffer(size_t maxSize, bool wait) {
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if (!in_stream.check(2, wait))
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return false;
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const U8* iptr = in_stream.getptr();
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const U8* eptr = in_stream.getend();
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size_t length = min((eptr - iptr)/2, maxSize);
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U8* optr = (U8*) end;
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for (size_t i=0; i<length; i++) {
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int v = 0;
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readHexAndShift(iptr[i*2], &v);
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readHexAndShift(iptr[i*2+1], &v);
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optr[i] = v;
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}
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in_stream.setptr(iptr + length*2);
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end += length;
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return true;
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}
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