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message_from_handle.c
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message_from_handle.c
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#include <R.h>
#include <Rinternals.h>
#include "gribr.h"
SEXP gribr_message_from_handle(codes_handle *h) {
int err;
int keyType;
int ctoi;
long bitmapBool;
long *bitmap = NULL;
long *keyVal_l = NULL;
double *keyVal_d = NULL;
double missingValue;
size_t totalKeys;
size_t i;
size_t n;
size_t keySize;
size_t keyLength;
size_t bmp_len;
const char *keyName = NULL;
char intChar;
char *keyVal_c = NULL;
codes_keys_iterator *keyIter = NULL;
SEXP gribr_grib_message;
SEXP gribr_list_names;
SEXP gribr_char;
PROTECT_INDEX pro_char;
PROTECT_WITH_INDEX(gribr_char = R_NilValue, &pro_char);
SEXP gribr_double;
double *p_rgib_double = NULL;
PROTECT_INDEX pro_double;
PROTECT_WITH_INDEX(gribr_double = R_NilValue, &pro_double);
SEXP gribr_long;
/* This is double since we will convert to R numeric */
double *p_rgib_long = NULL;
PROTECT_INDEX pro_long;
PROTECT_WITH_INDEX(gribr_long = R_NilValue, &pro_long);
/*
* Take care of these now in order to give the option
* of masking out data with NAs
*/
err = codes_get_double(h, "missingValue", &missingValue);
if (err) {
gerror("unable to get missing value", err);
}
err = codes_get_long(h, "bitmapPresent", &bitmapBool);
if (err) {
gerror("unable to get bitmapPresent variable", err);
} else {
if (bitmapBool) {
codes_get_size(h, "bitmap", &bmp_len);
bitmap = malloc(bmp_len * sizeof(long));
err = codes_get_long_array(h, "bitmap", bitmap, &bmp_len);
if (err) {
gerror("unable to get bitmap array", err);
}
}
}
keyIter = codes_keys_iterator_new(h, NO_FILTER, NULL_NAMESPACE);
if (keyIter == NULL) {
error("gribr: unable to create key iterator");
}
/* This seems like the only way to get the keys
* count to then allocate a list to contain them.
* Will monitor for a better solution. */
totalKeys = 0;
while(codes_keys_iterator_next(keyIter)) {
if (totalKeys % INTERRUPT_FREQ == 0) {
R_CheckUserInterrupt();
}
keyName = codes_keys_iterator_get_name(keyIter);
err = codes_get_native_type(h, keyName, &keyType);
if (skip_keys(keyName, keyType, err)) {
continue;
} else {
totalKeys++;
}
}
err = codes_keys_iterator_rewind(keyIter);
if (err) {
gerror("unable to rewind keys iterator", err);
}
gribr_grib_message = PROTECT(allocVector(VECSXP, totalKeys));
gribr_list_names = PROTECT(allocVector(STRSXP, totalKeys));
n = 0;
while(codes_keys_iterator_next(keyIter)) {
if (n % INTERRUPT_FREQ == 0) {
R_CheckUserInterrupt();
}
keyName = codes_keys_iterator_get_name(keyIter);
err = codes_get_native_type(h, keyName, &keyType);
if (skip_keys(keyName, keyType, err)) {
continue;
} else {
SET_STRING_ELT(gribr_list_names, n, mkChar(keyName));
err = codes_get_size(h, keyName, &keySize);
if (err) {
gerror("unable to get key value size", err);
}
switch(keyType) {
case CODES_TYPE_DOUBLE:
if (keySize > 1) {
keyVal_d = malloc(keySize * sizeof(double));
err = codes_get_double_array(h, keyName, keyVal_d, &keySize);
if (err) {
gwarn("unable to get double array", err);
break;
}
REPROTECT(gribr_double = allocVector(REALSXP, keySize), pro_double);
p_rgib_double = REAL(gribr_double);
for (i = 0; i < keySize; i++) {
p_rgib_double[i] = keyVal_d[i];
}
if (!strcmp(keyName, "values")) {
for (i = 0; i < keySize; i++) {
if (p_rgib_double[i] == missingValue || (bitmapBool && bitmap[i] == BITMAP_MASK)) {
p_rgib_double[i] = NA_REAL;
}
}
}
} else {
keyVal_d = malloc(sizeof(double));
err = codes_get_double(h, keyName, keyVal_d);
if (err) {
gwarn("unable to get double scalar", err);
break;
}
if (*keyVal_d == CODES_MISSING_DOUBLE) {
REPROTECT(gribr_double = ScalarReal(NA_REAL), pro_double);
} else {
REPROTECT(gribr_double = ScalarReal(*keyVal_d), pro_double);
}
}
nfree(keyVal_d);
SET_VECTOR_ELT(gribr_grib_message, n, gribr_double);
break;
/*
* Since R does not have a native long type, we can keep precision by doing
* some casting and using doubles instead. Basically, C long --> R numeric
*/
case CODES_TYPE_LONG:
if (keySize > 1) {
keyVal_l = malloc(keySize * sizeof(long));
err = codes_get_long_array(h, keyName, keyVal_l, &keySize);
if (err) {
gwarn("unable to get long array", err);
break;
}
REPROTECT(gribr_long = allocVector(REALSXP, keySize), pro_long);
p_rgib_long = REAL(gribr_long);
for (i = 0; i < keySize; i++) {
p_rgib_long[i] = (double)keyVal_l[i];
}
if (!strcmp(keyName, "values")) {
for (i = 0; i < keySize; i++) {
if (p_rgib_long[i] == missingValue || (bitmapBool && bitmap[i] == BITMAP_MASK)) {
p_rgib_long[i] = NA_REAL;
}
}
}
} else {
keyVal_l = malloc(sizeof(long));
err = codes_get_long(h, keyName, keyVal_l);
if (err) {
gerror("unable to get long scalar", err);
break;
}
if (*keyVal_l == CODES_MISSING_LONG) {
REPROTECT(gribr_long = ScalarInteger(NA_INTEGER), pro_long);
} else {
REPROTECT(gribr_long = ScalarReal((double)*keyVal_l), pro_long);
}
}
nfree(keyVal_l);
SET_VECTOR_ELT(gribr_grib_message, n, gribr_long);
break;
case CODES_TYPE_STRING:
codes_get_length(h, keyName, &keyLength);
keyVal_c = calloc(keyLength, sizeof(char));
err = codes_get_string(h, keyName, keyVal_c, &keyLength);
if (err) {
gwarn("unable to get string", err);
break;
} else {
intChar = keyVal_c[0];
if (strlen(keyVal_c) == 1 && isdigit(intChar)) {
/* Convert character integers to integers */
ctoi = intChar - '0';
REPROTECT(gribr_char = ScalarInteger(ctoi), pro_char);
} else {
REPROTECT(gribr_char = allocVector(STRSXP, 1), pro_char);
SET_STRING_ELT(gribr_char, 0, mkChar(keyVal_c));
}
}
nfree(keyVal_c);
SET_VECTOR_ELT(gribr_grib_message, n, gribr_char);
break;
default:
/* Skip others/errors */
break;
}
}
n++;
}
codes_keys_iterator_delete(keyIter);
if (bitmap) {
nfree(bitmap);
}
namesgets(gribr_grib_message, gribr_list_names);
classgets(gribr_grib_message, mkString("gribMessage"));
UNPROTECT(5);
return gribr_grib_message;
}