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/**
* To build this program, please make sure to reference linked libraries:
*
* g++ -std=c++11 -leckit -lodccore -o odc-cpp-encode-custom odc_encode_custom.cc
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <iostream>
#include "eckit/io/FileHandle.h"
#include "eckit/runtime/Main.h"
#include "odc/api/Odb.h"
using namespace eckit;
using namespace odc::api;
// Bitfield constants
#define Ob00000001 1
#define Ob00001011 11
#define Ob01101011 107
void usage() {
std::cerr << "Usage:\n odc-cpp-encode-custom <odb2 output file>" << std::endl << std::endl;
}
void cycle_longs(long* list, int size, long* pool, int pool_size) {
int index = 0;
int i;
for (i = 0; i < size; i++) {
if (index == pool_size)
index = 0;
list[i] = pool[index];
index++;
}
}
void cycle_doubles(double* list, int size, double* pool, int pool_size) {
int index = 0;
int i;
for (i = 0; i < size; i++) {
if (index == pool_size)
index = 0;
list[i] = pool[index];
index++;
}
}
void create_scratch_data(size_t nrows, char data0[][8], int64_t data1[], char data2[][8], char data3[][16],
double data4[], int64_t data5[], double data6[], int64_t data7[]) {
// Prepare the current date as an integer
time_t rawtime;
time(&rawtime);
struct tm* timeinfo;
timeinfo = localtime(&rawtime);
int64_t date = 10000 * (timeinfo->tm_year + 1900) + 100 * (timeinfo->tm_mon + 1) + timeinfo->tm_mday;
// Prepare the list of integer values, including the missing value
long integer_pool[] = {1234, 4321, Settings::integerMissingValue()};
int integer_pool_size = sizeof(integer_pool) / sizeof(integer_pool[0]);
std::vector<long> missing_integers(nrows);
cycle_longs(missing_integers.data(), nrows, integer_pool, integer_pool_size);
// Prepare the list of double values, including the missing value
double double_pool[] = {12.34, 43.21, Settings::doubleMissingValue()};
int double_pool_size = sizeof(double_pool) / sizeof(double_pool[0]);
std::vector<double> missing_doubles(nrows);
cycle_doubles(missing_doubles.data(), nrows, double_pool, double_pool_size);
// Prepare the list of bitfield values
long bitfield_pool[] = {Ob00000001, Ob00001011, Ob01101011};
int bitfield_pool_size = sizeof(bitfield_pool) / sizeof(bitfield_pool[0]);
std::vector<long> bitfield_values(nrows);
cycle_longs(bitfield_values.data(), nrows, bitfield_pool, bitfield_pool_size);
// Fill in the passed data arrays with scratch values
for (size_t i = 0; i < nrows; i++) {
ASSERT(snprintf(data0[i], 8, "xxxx") == 4); // expver
data1[i] = date; // date@hdr
ASSERT(snprintf(data2[i], 7, "stat%02ld", i) == 6); // statid@hdr
ASSERT(snprintf(data3[i], 16, "0-12345-0-678%02ld", i) == 15); // wigos@hdr
data4[i] = 12.3456 * i; // obsvalue@body
data5[i] = missing_integers[i]; // integer_missing
data6[i] = missing_doubles[i]; // double_missing
data7[i] = bitfield_values[i]; // bitfield_column
}
}
int main(int argc, char** argv) {
if (argc != 2) {
usage();
return 1;
}
// Get output path from command argument
char* path = argv[1];
// Initialise API
Main::initialise(argc, argv);
Settings::treatIntegersAsDoubles(false);
// Define row count
const size_t nrows = 20;
// Allocate data array for each column
char data0[nrows][8];
int64_t data1[nrows];
char data2[nrows][8];
char data3[nrows][16];
double data4[nrows];
int64_t data5[nrows];
double data6[nrows];
int64_t data7[nrows];
// Set up the allocated arrays with scratch data
create_scratch_data(nrows, data0, data1, data2, data3, data4, data5, data6, data7);
// Column `bitfield_column` is an integer with 4 bitfield values in it
std::vector<ColumnInfo::Bit> bitfields = {
// name, size, offset+=size(n-1)
{"flag_a", 1, 0},
{"flag_b", 2, 1},
{"flag_c", 3, 3},
{"flag_d", 1, 6},
};
// Define all column names, their types and sizes
std::vector<ColumnInfo> columns = {
ColumnInfo{std::string("expver"), ColumnType(STRING), 8},
ColumnInfo{std::string("date@hdr"), ColumnType(INTEGER), sizeof(int64_t)},
ColumnInfo{std::string("statid@hdr"), ColumnType(STRING), 8},
ColumnInfo{std::string("wigos@hdr"), ColumnType(STRING), 16},
ColumnInfo{std::string("obsvalue@body"), ColumnType(REAL), sizeof(double)},
ColumnInfo{std::string("integer_missing"), ColumnType(INTEGER), sizeof(int64_t)},
ColumnInfo{std::string("double_missing"), ColumnType(REAL), sizeof(double)},
ColumnInfo{std::string("bitfield_column"), ColumnType(BITFIELD), sizeof(int64_t), bitfields},
};
// Set a custom data layout and data array for each column
std::vector<ConstStridedData> strides{
// ptr, nrows, element_size, stride
{data0, nrows, 8, 8},
{data1, nrows, sizeof(int64_t), sizeof(int64_t)},
{data2, nrows, 8, 8},
{data3, nrows, 16, 16},
{data4, nrows, sizeof(double), sizeof(double)},
{data5, nrows, sizeof(int64_t), sizeof(int64_t)},
{data6, nrows, sizeof(double), sizeof(double)},
{data7, nrows, sizeof(int64_t), sizeof(int64_t)},
};
// Add some key/value metadata to the frame
std::map<std::string, std::string> properties = {
{"encoded_by", "odc_example"},
};
const Length length;
FileHandle fh(path);
fh.openForWrite(length);
AutoClose closer(fh);
// Encode ODB-2 into a data handle
encode(fh, columns, strides, properties);
std::cout << "Written " << nrows << " to " << path << std::endl;
return 0;
}
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