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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/HexOutStream.h>
#include <rdr/Exception.h>
using namespace rdr;
const int DEFAULT_BUF_LEN = 16384;
static inline size_t min(size_t a, size_t b) {return a<b ? a : b;}
HexOutStream::HexOutStream(OutStream& os, size_t buflen)
: out_stream(os), offset(0), bufSize(buflen ? buflen : DEFAULT_BUF_LEN)
{
if (bufSize % 2)
bufSize--;
ptr = start = new U8[bufSize];
end = start + bufSize;
}
HexOutStream::~HexOutStream() {
delete [] start;
}
char HexOutStream::intToHex(int i) {
if ((i>=0) && (i<=9))
return '0'+i;
else if ((i>=10) && (i<=15))
return 'a'+(i-10);
else
throw rdr::Exception("intToHex failed");
}
char* HexOutStream::binToHexStr(const char* data, size_t length) {
char* buffer = new char[length*2+1];
for (size_t i=0; i<length; i++) {
buffer[i*2] = intToHex((data[i] >> 4) & 15);
buffer[i*2+1] = intToHex((data[i] & 15));
if (!buffer[i*2] || !buffer[i*2+1]) {
delete [] buffer;
return 0;
}
}
buffer[length*2] = 0;
return buffer;
}
void
HexOutStream::writeBuffer() {
U8* pos = start;
while (pos != ptr) {
out_stream.check(2);
U8* optr = out_stream.getptr();
U8* oend = out_stream.getend();
size_t length = min(ptr-pos, (oend-optr)/2);
for (size_t i=0; i<length; i++) {
optr[i*2] = intToHex((pos[i] >> 4) & 0xf);
optr[i*2+1] = intToHex(pos[i] & 0xf);
}
out_stream.setptr(optr + length*2);
pos += length;
}
offset += ptr - start;
ptr = start;
}
size_t HexOutStream::length()
{
return offset + ptr - start;
}
void
HexOutStream::flush() {
writeBuffer();
out_stream.flush();
}
size_t
HexOutStream::overrun(size_t itemSize, size_t nItems) {
if (itemSize > bufSize)
throw Exception("HexOutStream overrun: max itemSize exceeded");
writeBuffer();
size_t nAvail;
nAvail = (end - ptr) / itemSize;
if (nAvail < nItems)
return nAvail;
return nItems;
}
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