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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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <rdr/ZlibInStream.h>
#include <rdr/Exception.h>
#include <zlib.h>
using namespace rdr;
ZlibInStream::ZlibInStream()
: underlying(nullptr), zs(nullptr), bytesIn(0)
{
init();
}
ZlibInStream::~ZlibInStream()
{
deinit();
}
void ZlibInStream::setUnderlying(InStream* is, size_t bytesIn_)
{
underlying = is;
bytesIn = bytesIn_;
skip(avail());
}
void ZlibInStream::flushUnderlying()
{
while (bytesIn > 0) {
if (!hasData(1))
throw Exception("ZlibInStream: failed to flush remaining stream data");
skip(avail());
}
setUnderlying(nullptr, 0);
}
void ZlibInStream::reset()
{
deinit();
init();
}
void ZlibInStream::init()
{
assert(zs == nullptr);
zs = new z_stream;
zs->zalloc = nullptr;
zs->zfree = nullptr;
zs->opaque = nullptr;
zs->next_in = nullptr;
zs->avail_in = 0;
if (inflateInit(zs) != Z_OK) {
delete zs;
zs = nullptr;
throw Exception("ZlibInStream: inflateInit failed");
}
}
void ZlibInStream::deinit()
{
assert(zs != nullptr);
setUnderlying(nullptr, 0);
inflateEnd(zs);
delete zs;
zs = nullptr;
}
bool ZlibInStream::fillBuffer()
{
if (!underlying)
throw Exception("ZlibInStream overrun: no underlying stream");
zs->next_out = (uint8_t*)end;
zs->avail_out = availSpace();
if (!underlying->hasData(1))
return false;
size_t length = underlying->avail();
if (length > bytesIn)
length = bytesIn;
zs->next_in = (uint8_t*)underlying->getptr(length);
zs->avail_in = length;
int rc = inflate(zs, Z_SYNC_FLUSH);
if (rc < 0) {
throw Exception("ZlibInStream: inflate failed");
}
bytesIn -= length - zs->avail_in;
end = zs->next_out;
underlying->setptr(length - zs->avail_in);
return true;
}
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