libgta 1.0.6 Read and Write Generic Tagged Array (GTA) files

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Examples written in C++: Introductory example
/* This file is in the public domain. */
#include <iostream>
#include <fstream>
#include <exception>
#include <vector>
#include <gta/gta.hpp>
int main(void)
{
try {
gta::header header;
/* Create a GTA that contains an RGB image with 256x128 pixels */
header.set_components(gta::uint8, gta::uint8, gta::uint8);
header.set_dimensions(256, 128);
std::vector<unsigned char> data(header.data_size());
for (uintmax_t y = 0; y < 128; y++) {
for (uintmax_t x = 0; x < 256; x++) {
unsigned char *pixel = static_cast<unsigned char *>(
header.element(&(data[0]), x, y));
pixel[0] = x;
pixel[1] = 2 * y;
pixel[2] = 128;
}
}
/* Set some tags (this is entirely optional) */
header.component_taglist(0).set("INTERPRETATION", "RED");
header.component_taglist(1).set("INTERPRETATION", "GREEN");
header.component_taglist(2).set("INTERPRETATION", "BLUE");
/* Write the GTA to a file */
std::ofstream ofs("rgb.gta", std::ios::out | std::ios::binary);
header.set_compression(gta::bzip2);
header.write_to(ofs);
header.write_data(ofs, &(data[0]));
ofs.close();
/* Reread the same file */
std::ifstream ifs("rgb.gta", std::ios::in | std::ios::binary);
header.read_from(ifs);
if (header.components() != 3
|| header.component_type(0) != gta::uint8
|| header.component_type(1) != gta::uint8
|| header.component_type(2) != gta::uint8) {
throw std::exception();
}
if (header.dimensions() != 2
|| header.dimension_size(0) != 256
|| header.dimension_size(1) != 128) {
throw std::exception();
}
header.read_data(ifs, &(data[0]));
}
catch (std::exception &e) {
std::cerr << e.what() << std::endl;
return 1;
}
return 0;
}