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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 <stdio.h>
#include <stdlib.h>
#undef NDEBUG
#include <assert.h>
#include "eccodes.h"
#include <sys/stat.h>
int main(int argc, char** argv)
{
int err = 0;
size_t len = 0;
grib_context* ctx = grib_context_get_default();
assert(argc == 5);
const char* in_filename = argv[1]; // CCSDS field - not constant
const char* in_sample = argv[2]; // CCSDS sample - constant field
const char* out_binfile = argv[3]; // binary file with raw bytes
const char* out_filename = argv[4]; // final output
FILE* in = fopen(in_filename, "rb");
assert(in);
codes_handle* h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
assert(h);
fclose(in);
// TODO assert grib edition == 2
// TODO check isGridded == 1
// TODO check packingType == grid_ccsds
// TODO check NO BITMAP
// Get meta-data from input field
double referenceValue = 0;
long bitsPerValue = 0, ccsdsFlags = 0, numberOfValues = 0, numberOfDataPoints = 0;
long binaryScaleFactor = 0, decimalScaleFactor = 0, ccsdsBlockSize = 0, ccsdsRsi = 0;
GRIB_CHECK(codes_get_double(h, "referenceValue", &referenceValue), 0);
GRIB_CHECK(codes_get_long(h, "binaryScaleFactor", &binaryScaleFactor), 0);
GRIB_CHECK(codes_get_long(h, "decimalScaleFactor", &decimalScaleFactor), 0);
GRIB_CHECK(codes_get_long(h, "bitsPerValue", &bitsPerValue), 0);
GRIB_CHECK(codes_get_long(h, "ccsdsFlags", &ccsdsFlags), 0);
GRIB_CHECK(codes_get_long(h, "ccsdsBlockSize", &ccsdsBlockSize), 0);
GRIB_CHECK(codes_get_long(h, "ccsdsRsi", &ccsdsRsi), 0);
GRIB_CHECK(codes_get_long(h, "numberOfValues", &numberOfValues), 0);
GRIB_CHECK(codes_get_long(h, "numberOfDataPoints", &numberOfDataPoints), 0);
// Get input field values as bytes
unsigned char* byte_val = NULL;
size_t blen = 0;
long sec7Len = -1;
// CODES_CHECK(codes_get_length(h, "codedValues", &klen), 0); // no good, always 1025!
CODES_CHECK(codes_get_long(h, "section7Length", &sec7Len), 0); //grib2 only
printf("1. codes_get_length of sec7 = %zu\n", sec7Len);
blen = sec7Len;
byte_val = (unsigned char*)malloc(blen * sizeof(unsigned char));
GRIB_CHECK(codes_get_bytes(h, "codedValues", byte_val, &blen), 0);//magic
printf("1. codes_get_bytes blen = %zu\n", blen);
FILE* fout = fopen(out_binfile, "wb");
if (fwrite(byte_val, 1, blen, fout) != blen) {
perror("output");
exit(1);
}
printf("Wrote out %s\n", out_binfile);
fclose(fout);
// Read direct from bytes in a file
struct stat finfo;
size_t fsize = 0;
unsigned char* data = NULL;
unsigned char* p = NULL;
FILE* f = fopen(out_binfile, "rb");
stat(out_binfile, &finfo);
fsize = finfo.st_size;
printf("Read bin file: fsize=%zu\n", fsize);
data = (unsigned char*)malloc(fsize);
p = data;
if (fread(data, 1, fsize, f) != fsize) {
perror(out_binfile);
exit(1);
}
fclose(f);
len = fsize;
in = fopen(in_sample, "rb");
assert(in);
codes_handle* h1 = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
assert(h1);
len = fsize;
grib_context_set_debug(ctx, -1);
GRIB_CHECK(codes_set_long(h1, "bitsPerValue", bitsPerValue), 0);
GRIB_CHECK(codes_set_long(h1, "decimalScaleFactor", decimalScaleFactor), 0);
// Normally one cannot set the read_only keys like referenceValue and binaryScaleFactor.
// e.g., GRIB_CHECK( grib_set_double(h1, "referenceValue", referenceValue), 0);
// Workaround: Resort to trick and force it via grib_set_force_double_array
grib_set_force_double_array(h1, "referenceValue", &referenceValue, 1);
double bsf = binaryScaleFactor;
grib_set_force_double_array(h1, "binaryScaleFactor", &bsf, 1);
GRIB_CHECK(codes_set_long(h1, "ccsdsFlags", ccsdsFlags), 0);
GRIB_CHECK(codes_set_long(h1, "ccsdsBlockSize", ccsdsBlockSize), 0);
GRIB_CHECK(codes_set_long(h1, "ccsdsRsi", ccsdsRsi), 0);
GRIB_CHECK(codes_set_long(h1, "numberOfValues", numberOfValues), 0);
GRIB_CHECK(codes_set_long(h1, "numberOfDataPoints", numberOfDataPoints), 0);
GRIB_CHECK(codes_set_bytes(h1, "codedValues", p, &len), 0);//magic
CODES_CHECK(codes_write_message(h1, out_filename, "w"), 0);
grib_context_set_debug(ctx, 0);
codes_handle_delete(h1);
free(data);
free(byte_val);
codes_handle_delete(h);
return 0;
}
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