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/**
* To build this program, please make sure to reference linked libraries:
*
* g++ -std=c++11 -leckit -lodccore -o odc-cpp-ls odc_ls.cc
*/
#include <math.h>
#include <cstdint>
#include <iomanip>
#include <iostream>
#include <numeric>
#include <vector>
#include "eckit/runtime/Main.h"
#include "odc/api/Odb.h"
void usage() {
std::cerr << "Usage:\n odc-cpp-ls <odb2 file>" << std::endl << std::endl;
}
void write_header(int i, odc::api::ColumnInfo col) {
int padding = col.decodedSize - floor(log10(abs(i + 1))) + 2;
std::cout << (i + 1) << ". " << std::left << std::setw(padding) << col.name << "\t";
}
void write_data(size_t nrows, size_t ncols, std::vector<odc::api::ColumnInfo> columnInfo,
std::vector<odc::api::StridedData> strides, std::vector<int> nbits) {
long integer_missing = odc::api::Settings::integerMissingValue();
double double_missing = odc::api::Settings::doubleMissingValue();
for (size_t row = 0; row < nrows; ++row) {
for (size_t col = 0; col < ncols; ++col) {
switch (columnInfo[col].type) {
case odc::api::INTEGER: {
int64_t val = *reinterpret_cast<const int64_t*>(strides[col][row]);
if (val == integer_missing) {
std::cout << ".";
}
else {
std::cout << std::left << std::setw(columnInfo[col].decodedSize) << val;
}
break;
}
case odc::api::BITFIELD: {
int64_t val = *reinterpret_cast<const int64_t*>(strides[col][row]);
for (int bit = nbits[col] - 1; bit >= 0; --bit) {
std::cout << ((val & (1 << bit)) ? "1" : "0");
}
break;
}
case odc::api::REAL:
case odc::api::DOUBLE: {
double val = *reinterpret_cast<const double*>(strides[col][row]);
if (val == double_missing) {
std::cout << ".";
}
else {
std::cout << std::left << std::setw(columnInfo[col].decodedSize) << val;
}
break;
}
std::cout << *reinterpret_cast<const int64_t*>(strides[col][row]);
break;
case odc::api::STRING:
std::cout << std::left << std::setw(columnInfo[col].decodedSize)
<< std::string(strides[col][row],
::strnlen(strides[col][row], columnInfo[col].decodedSize));
break;
default:
ASSERT(false);
};
std::cout << "\t";
}
std::cout << std::endl;
}
}
int main(int argc, char** argv) {
if (argc != 2) {
usage();
return 1;
}
char* path = argv[1];
eckit::Main::initialise(argc, argv);
// Initialise library
odc::api::Settings::treatIntegersAsDoubles(false);
// Open the specified ODB file
odc::api::Reader reader(path);
// Iterate through the frames
odc::api::Frame frame;
while ((frame = reader.next())) {
// Properties of this frame
size_t ncols = frame.columnCount();
size_t nrows = frame.rowCount();
const auto& columnInfo = frame.columnInfo();
// Print headers & determine storage requirements
size_t row_size = 0;
size_t i;
for (i = 0; i < frame.columnCount(); ++i) {
const auto& col(columnInfo[i]);
write_header(i, col);
row_size += col.decodedSize;
}
std::cout << std::endl;
// Allocate storage required
size_t storage_size = row_size * nrows;
std::vector<char> buffer(storage_size);
// Decoder prerequisites
std::vector<std::string> columns;
std::vector<odc::api::StridedData> strides;
std::vector<int> nbits;
char* ptr = &buffer[0];
for (const auto& col : columnInfo) {
columns.push_back(col.name);
strides.emplace_back(odc::api::StridedData{ptr, nrows, col.decodedSize, col.decodedSize});
ptr += nrows * col.decodedSize;
// Bits for formatting bitfields
if (col.type == odc::api::BITFIELD) {
nbits.push_back(std::accumulate(col.bitfield.begin(), col.bitfield.end(), 0,
[](int l, const odc::api::ColumnInfo::Bit& r) { return l + r.size; }));
}
else {
nbits.push_back(0);
}
}
ASSERT(ptr == (&buffer[0] + storage_size));
// Decode the data
int nthreads = 4;
odc::api::Decoder decoder(columns, strides);
decoder.decode(frame, nthreads);
// Iterate through the decoded data, and print it
write_data(nrows, ncols, columnInfo, strides, nbits);
}
return 0;
}
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