mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-11-23 00:23:13 +01:00
113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/* 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 <assert.h>
|
|
|
|
#include <rdr/ZlibInStream.h>
|
|
#include <rdr/Exception.h>
|
|
#include <zlib.h>
|
|
|
|
using namespace rdr;
|
|
|
|
ZlibInStream::ZlibInStream()
|
|
: underlying(0), zs(NULL), 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 (!check(1))
|
|
throw Exception("ZlibInStream: failed to flush remaining stream data");
|
|
skip(avail());
|
|
}
|
|
|
|
setUnderlying(NULL, 0);
|
|
}
|
|
|
|
void ZlibInStream::reset()
|
|
{
|
|
deinit();
|
|
init();
|
|
}
|
|
|
|
void ZlibInStream::init()
|
|
{
|
|
assert(zs == NULL);
|
|
|
|
zs = new z_stream;
|
|
zs->zalloc = Z_NULL;
|
|
zs->zfree = Z_NULL;
|
|
zs->opaque = Z_NULL;
|
|
zs->next_in = Z_NULL;
|
|
zs->avail_in = 0;
|
|
if (inflateInit(zs) != Z_OK) {
|
|
delete zs;
|
|
zs = NULL;
|
|
throw Exception("ZlibInStream: inflateInit failed");
|
|
}
|
|
}
|
|
|
|
void ZlibInStream::deinit()
|
|
{
|
|
assert(zs != NULL);
|
|
setUnderlying(NULL, 0);
|
|
inflateEnd(zs);
|
|
delete zs;
|
|
zs = NULL;
|
|
}
|
|
|
|
bool ZlibInStream::fillBuffer(size_t maxSize, bool wait)
|
|
{
|
|
if (!underlying)
|
|
throw Exception("ZlibInStream overrun: no underlying stream");
|
|
|
|
zs->next_out = (U8*)end;
|
|
zs->avail_out = maxSize;
|
|
|
|
size_t n = underlying->check(1, wait);
|
|
if (n == 0) return false;
|
|
zs->next_in = (U8*)underlying->getptr();
|
|
zs->avail_in = underlying->avail();
|
|
if (zs->avail_in > bytesIn)
|
|
zs->avail_in = bytesIn;
|
|
|
|
int rc = inflate(zs, Z_SYNC_FLUSH);
|
|
if (rc < 0) {
|
|
throw Exception("ZlibInStream: inflate failed");
|
|
}
|
|
|
|
bytesIn -= zs->next_in - underlying->getptr();
|
|
end = zs->next_out;
|
|
underlying->setptr(zs->next_in);
|
|
return true;
|
|
}
|