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/**************************************************************************
*
* Copyright 2015 VMware, Inc.
* Copyright 2011 Zack Rusin
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include "trace_ostream.hpp"
#include <assert.h>
#include <string.h>
#include <zlib.h>
#include "os.hpp"
#include <iostream>
using namespace trace;
class ZLibOutStream : public OutStream {
public:
ZLibOutStream(gzFile file);
virtual ~ZLibOutStream();
protected:
virtual bool write(const void *buffer, size_t length) override;
virtual void flush(void) override;
private:
gzFile m_gzFile;
};
ZLibOutStream::ZLibOutStream(gzFile file)
: m_gzFile(file)
{
}
ZLibOutStream::~ZLibOutStream()
{
if (m_gzFile) {
gzclose(m_gzFile);
m_gzFile = nullptr;
}
}
bool ZLibOutStream::write(const void *buffer, size_t length)
{
return gzwrite(m_gzFile, buffer, unsigned(length)) != -1;
}
void ZLibOutStream::flush(void)
{
gzflush(m_gzFile, Z_SYNC_FLUSH);
}
OutStream *
trace::createZLibStream(const char *filename)
{
gzFile file = gzopen(filename, "wb");
if (!file) {
return nullptr;
}
// Currently we only use gzip for offline compression, so aim for maximum
// compression
gzsetparams(file, Z_BEST_COMPRESSION, Z_DEFAULT_STRATEGY);
return new ZLibOutStream(file);
}
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