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/*
* (C) Copyright 2005- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
#include <iostream>
using std::cerr;
using std::cout;
using std::endl;
#undef NDEBUG
#include <assert.h>
#include "eccodes.h"
int main(int argc, char* argv[])
{
FILE* in = NULL;
codes_handle* source_handle = NULL;
int err = 0;
size_t totalLength = 0, size = 0;
unsigned char* buffer = NULL;
codes_handle* new_handle = NULL;
off_t offset = 0;
assert (argc == 3);
cout << codes_get_api_version() << endl;
in = fopen(argv[1], "rb");
assert(in);
source_handle = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
assert(source_handle);
CODES_CHECK(codes_get_message_offset(source_handle, &offset), 0);
cout << "offset = "<< offset << endl;
// How big is the input GRIB message?
CODES_CHECK(codes_get_message_size(source_handle, &totalLength), 0);
// Allocate a buffer large enough to hold the message
buffer = (unsigned char*)malloc(totalLength);
size = totalLength;
// Take a copy of the message into buffer. Now we own it
CODES_CHECK(codes_get_message_copy(source_handle, buffer, &size), 0);
assert(size == totalLength);
codes_handle_delete(source_handle);
// Now buffer contains a copy of the message
new_handle = codes_handle_new_from_message(0, buffer, totalLength);
assert(new_handle);
// Change something and write it out
CODES_CHECK(codes_set_long(new_handle, "hour", 18), 0);
CODES_CHECK(codes_write_message(new_handle, argv[2], "w"), 0);
codes_handle_delete(new_handle);
free(buffer);
fclose(in);
return 0;
}
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