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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.
*/
/*
* Description:
* Split an input BUFR file into output files according to 'rdbSubtype'.
* The output files are named split_rdbSubtype.<rdbSubtype>.bufr.
* This is much faster than bufr_copy/bufr_filter
*
*/
#include "grib_api_internal.h"
static int verbose = 0;
static const char* OUTPUT_FILENAME_DEFAULT = "split_rdbSubtype.undef.bufr";
static const char* OUTPUT_FILENAME_SUBTYPE = "split_rdbSubtype.%ld.bufr";
const char* tool_name = "bufr_split_by_rdbSubtype";
static void usage(const char* prog)
{
printf("Usage: %s [-v] infile\n", prog);
exit(1);
}
/* If rdbSubtype can be extracted, return GRIB_SUCCESS otherwise error code. */
/* If BUFR message does not have an ECMWF local section, set rdbSubtype to -1 */
static int decode_rdbSubtype(const void* msg, long* rdbSubtype)
{
int err = GRIB_SUCCESS;
long edition = 0;
long pos_edition = 7 * 8;
const long nbits_edition = 8;
long section1Flags = 0;
long nbits_section1Flags = 1 * 8;
long pos_section1Flags = 17 * 8;
long section1Length = 0;
const long nbits_section1Length = 24;
long bufrHeaderCentre = 0;
long nbits_bufrHeaderCentre = 2 * 8;
long pos_bufrHeaderCentre = 12 * 8;
long pos_section1Length = 8 * 8;
int ecmwfLocalSectionPresent = 0;
const unsigned char* message = (const unsigned char*)msg;
ECCODES_ASSERT(message);
*rdbSubtype = -1; /* default */
edition = (long)grib_decode_unsigned_long(message, &pos_edition, nbits_edition);
if (edition != 2 && edition != 3 && edition != 4) {
fprintf(stderr, "%s: Unsupported BUFR edition: %ld", tool_name, edition);
return GRIB_DECODING_ERROR;
}
section1Length = (long)grib_decode_unsigned_long(message, &pos_section1Length, nbits_section1Length);
if (edition == 3) {
pos_section1Flags = 15 * 8;
nbits_bufrHeaderCentre = 1 * 8;
pos_bufrHeaderCentre = 13 * 8;
}
if (edition == 2) {
pos_section1Flags = 15 * 8;
}
bufrHeaderCentre = (long)grib_decode_unsigned_long(message, &pos_bufrHeaderCentre, nbits_bufrHeaderCentre);
section1Flags = (long)grib_decode_unsigned_long(message, &pos_section1Flags, nbits_section1Flags);
if (section1Flags != 0 && section1Flags != 128) {
fprintf(stderr, "%s: Invalid BUFR section1 flags: %ld\n", tool_name, section1Flags);
return GRIB_DECODING_ERROR;
}
ecmwfLocalSectionPresent = (bufrHeaderCentre == 98 && section1Flags != 0);
/*printf("SPLT: edition=%ld section1Length=%ld bufrHeaderCentre=%ld section1Flags=%ld", edition,section1Length,bufrHeaderCentre,section1Flags);*/
if (ecmwfLocalSectionPresent) {
long oldSubtype = 0;
long newSubtype = 0;
long nbits_oldSubtype = 1 * 8;
long nbits_newSubtype = 2 * 8;
const long section0Length = 8;
long pos_oldSubtype = (section0Length + section1Length + 5) * 8;
long pos_newSubtype = (section0Length + section1Length + 49) * 8;
oldSubtype = (long)grib_decode_unsigned_long(message, &pos_oldSubtype, nbits_oldSubtype);
newSubtype = (long)grib_decode_unsigned_long(message, &pos_newSubtype, nbits_newSubtype);
/*printf(" oldSubtype=%ld newSubtype=%ld\n", oldSubtype, newSubtype);*/
if (oldSubtype < 255)
*rdbSubtype = oldSubtype;
else
*rdbSubtype = newSubtype;
}
/*else printf(" oldSubtype=undef newSubtype=undef\n");*/
return err;
}
static int split_file_by_subtype(FILE* in, const char* filename, unsigned long* count)
{
void* mesg = NULL;
FILE* out;
size_t size = 0;
off_t offset = 0;
int err = GRIB_SUCCESS;
char ofilename[2048] = {0,};
grib_context* c = grib_context_get_default();
if (!in)
return 1;
snprintf(ofilename, 2048, "%s", OUTPUT_FILENAME_DEFAULT); /*default name*/
while (err != GRIB_END_OF_FILE) {
mesg = wmo_read_bufr_from_file_malloc(in, 0, &size, &offset, &err);
if (mesg != NULL && err == 0) {
/* Decode subtype from mesg */
long rdbSubtype = 0;
int status = decode_rdbSubtype(mesg, &rdbSubtype);
if (status != GRIB_SUCCESS) {
fprintf(stderr, "%s: Failed to decode rdbSubtype from message %lu\n", tool_name, *count);
return status;
}
snprintf(ofilename, 2048, "%s", OUTPUT_FILENAME_DEFAULT);
if (rdbSubtype != -1)
snprintf(ofilename, 2048, OUTPUT_FILENAME_SUBTYPE, rdbSubtype);
if (verbose) {
if (!path_is_regular_file(ofilename))
printf("Writing output to %s\n", ofilename);
}
out = fopen(ofilename, "ab");
if (!out) {
fprintf(stderr, "%s: Failed to open output file '%s'\n", tool_name, ofilename);
perror(ofilename);
return GRIB_IO_PROBLEM;
}
if (fwrite(mesg, 1, size, out) != size) {
fprintf(stderr, "%s: Failed to append to file '%s'\n", tool_name, ofilename);
perror(ofilename);
fclose(out);
return GRIB_IO_PROBLEM;
}
grib_context_free(c, mesg);
fclose(out);
(*count)++;
}
}
if (err == GRIB_END_OF_FILE)
err = GRIB_SUCCESS;
return err;
}
int main(int argc, char* argv[])
{
FILE* infh = NULL;
char* filename;
int i, status = 0;
int err = 0;
unsigned long count = 0;
if (argc != 2 && argc != 3)
usage(argv[0]);
i = 1;
if (strcmp(argv[i], "-v") == 0) {
i++;
verbose = 1;
if (argc != 3)
usage(argv[0]);
}
filename = argv[i];
if (path_is_directory(filename)) {
fprintf(stderr, "%s: %s: Is a directory\n", tool_name, filename);
return 1;
}
infh = fopen(filename, "rb");
if (!infh) {
perror(filename);
return 1;
}
count = 0;
err = split_file_by_subtype(infh, filename, &count);
if (err) {
fprintf(stderr, "%s: Failed to split BUFR file %s\n", tool_name, filename);
status = 1;
}
else {
if (verbose)
printf("%7lu %s\n", count, filename);
}
fclose(infh);
return status;
}
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