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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_ZLIB_H
#include "client.h"
ZlibFilter::ZlibFilter() : buffer_(65536)
{
inflateInit(&stream_);
}
ZlibFilter::~ZlibFilter()
{
inflateEnd(&stream_);
}
bool ZlibFilter::Run(void** buf, size_t* n) {
stream_.next_in = static_cast<unsigned char*>(*buf);
stream_.avail_in = *n;
stream_.next_out = &buffer_[0];
size_t avail_out = 0;
size_t buffer_size = buffer_.size();
size_t chunk_size = buffer_size;
stream_.avail_out = buffer_size;
while (true) {
int err = inflate(&stream_, Z_NO_FLUSH);
if (err != Z_OK && err != Z_STREAM_END) {
return false;
}
if (stream_.avail_in > 0) {
chunk_size = buffer_size;
buffer_size *= 2;
buffer_.resize(buffer_size);
stream_.next_out = reinterpret_cast<Bytef*>(&buffer_[chunk_size]);
stream_.avail_out = chunk_size;
avail_out += chunk_size;
continue;
}
*buf = &buffer_[0];
*n = avail_out + chunk_size - stream_.avail_out;
return true;
}
}
#endif // HAVE_ZLIB_H
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