Here is the code example for compressing data with zlib using POCO.
#include <Poco\DeflatingStream.h>
#include <Poco\InflatingStream.h>
#include <Poco\BinaryReader.h>
#include <Poco\BinaryWriter.h>
#include <iostream>
#include <fstream>
#include <stdint.h>
#include <string>
// Using 1D array for passing material data for simplicity, not bothering to check pointer.
void saveData(uint8_t* materialData, uint32_t arraySize, std::string fileName)
{
std::ofstream outputStream(fileName.c_str(), std::ios::binary);
Poco::DeflatingOutputStream deflator(outputStream, Poco::DeflatingStreamBuf::STREAM_ZLIB);
Poco::BinaryWriter binaryWriter(deflator, Poco::BinaryWriter::NATIVE_BYTE_ORDER);
for(uint32_t i = 0 ; i < arraySize ; i++)
binaryWriter << materialData[i];
deflator.close(); // this will perform the actual compression
outputStream.close();
}
// Assumes that arraySize and file data match. Not taking EOF into account for example code.
void loadData(uint8_t* materialData, uint32_t arraySize, std::string fileName)
{
std::ifstream inputStream(fileName.c_str(), std::ios::binary);
Poco::InflatingInputStream inflator(inputStream, Poco::InflatingStreamBuf::STREAM_ZLIB);
Poco::BinaryReader binaryReader(inflator, Poco::BinaryReader::NATIVE_BYTE_ORDER);
for(uint32_t i = 0 ; i < arraySize ; i++)
binaryReader >> materialData[i];
inputStream.close();
}
