Hi guys,
I am having problem in serialization with GZIP and ofstream and ifstream.
I suspect the problem might be due to misuse of API due to unfamiliarity
with protobuf because i cant seems to find example working with
ofstream/fstream with GZIP.
The problem happens when trying to serialize object into file with
compression.
The code is as below:
#include <iostream>
#include <fstream>
#include <ostream>
#include <istream>
#include <string>
#include <cstdint>
#include "Scene.pb.h"
#include <google\protobuf\io\zero_copy_stream_impl.h>
#include <google\protobuf\io\gzip_stream.h>
int const _MIN = 0;
int const _MAX = 255;
unsigned int const _SIZE = 65200000;
unsigned int const _COMPRESSION_LEVEL = 10;
void randWithinUnsignedCharSize(uint8_t * buffer, unsigned int size)
{
for (size_t i = 0; i < size; ++i)
{
buffer[i] = _MIN + (rand() % static_cast<int>(_MAX - _MIN + 1));
}
}
using namespace google::protobuf::io;
int main()
{
GOOGLE_PROTOBUF_VERIFY_VERSION;
Recipe::Scene * scene = new Recipe::Scene();
uint8_t * imageData = new uint8_t[_SIZE];
randWithinUnsignedCharSize(imageData, _SIZE);
for (size_t i = 0; i < _SIZE; i++)
{
scene->add_imagedata(imageData[i]);
}
std::cout << "scene->imagedata_size() " << scene->imagedata_size() <<
std::endl;
{
std::ofstream output("scene.art", std::ofstream::out | std::ofstream::trunc
| std::ofstream::binary);
OstreamOutputStream outputFileStream(&output);
GzipOutputStream::Options options;
options.format = GzipOutputStream::GZIP;
options.compression_level = _COMPRESSION_LEVEL;
GzipOutputStream gzipOutputStream(&outputFileStream, options);
if (!scene->SerializeToZeroCopyStream(&gzipOutputStream)) { *//problem
happens here*
std::cerr << "Failed to write scene." << std::endl;
return -1;
}
}
Recipe::Scene * scene1 = new Recipe::Scene();
{
std::ifstream input("scene.art", std::ifstream::in | std::ifstream::binary);
IstreamInputStream inputFileStream(&input);
GzipInputStream gzipInputStream(&inputFileStream);
if (!scene1->ParseFromZeroCopyStream(&gzipInputStream)) {
std::cerr << "Failed to parse scene." << std::endl;
return -1;
}
}
std::cout << "scene1->imagedata_size() " << scene1->imagedata_size()
<<std::endl;
google::protobuf::ShutdownProtobufLibrary();
delete scene;
delete scene1;
return 0;
}
Thanks
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