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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.
*/
#include <rdr/HexInStream.h>
#include <rdr/Exception.h>
#include <stdlib.h>
#include <ctype.h>
using namespace rdr;
static inline int min(int a, int b) {return a<b ? a : b;}
HexInStream::HexInStream(InStream& is)
: in_stream(is)
{
}
HexInStream::~HexInStream() {
}
bool HexInStream::readHexAndShift(char c, int* v) {
c=tolower(c);
if ((c >= '0') && (c <= '9'))
*v = (*v << 4) + (c - '0');
else if ((c >= 'a') && (c <= 'f'))
*v = (*v << 4) + (c - 'a' + 10);
else
return false;
return true;
}
bool HexInStream::hexStrToBin(const char* s, char** data, size_t* length) {
size_t l=strlen(s);
if ((l % 2) == 0) {
delete [] *data;
*data = 0; *length = 0;
if (l == 0)
return true;
*data = new char[l/2];
*length = l/2;
for(size_t i=0;i<l;i+=2) {
int byte = 0;
if (!readHexAndShift(s[i], &byte) ||
!readHexAndShift(s[i+1], &byte))
goto decodeError;
(*data)[i/2] = byte;
}
return true;
}
decodeError:
delete [] *data;
*data = 0;
*length = 0;
return false;
}
bool HexInStream::fillBuffer(size_t maxSize, bool wait) {
if (!in_stream.hasData(2))
return false;
size_t length = min(in_stream.avail()/2, maxSize);
const U8* iptr = in_stream.getptr(length*2);
U8* optr = (U8*) end;
for (size_t i=0; i<length; i++) {
int v = 0;
readHexAndShift(iptr[i*2], &v);
readHexAndShift(iptr[i*2+1], &v);
optr[i] = v;
}
in_stream.setptr(length*2);
end += length;
return true;
}
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