netcdf-c: NC_DISKLESS returns garbage data for certain files

using the latest netcdf-c from master, NC_DISKLESS mode can return garbage data for certain files.

With the following file: foo.zip

and the following code:

#include <iostream>
#include <netcdf.h>
#include <netcdf_mem.h>
#include <iostream>
#include <fstream>
#include <assert.h>
#import <vector>


using namespace std;

#define    HRAPY  200
#define    HRAPX  333


static size_t value_count[] = {HRAPY, HRAPX};
static size_t start[] = {0, 0};

int main(int argc, const char * argv[]) {
    ifstream file("/tmp/foo.nc", ios::in | ios::binary | ios::ate);
    streamsize size = file.tellg();
    file.seekg(0, ios::beg);
    
    std::vector<char> buffer(size);
    int status;
    int ncid;
    
    if (file.read(buffer.data(), size))
    {
//        status = nc_open_mem(".nc", 0, size, buffer.data(), &ncid);
        status = nc_open("/tmp/foo.nc", NC_DISKLESS|NC_CDF5, &ncid);
        if(status != NC_NOERR) {
            cout << nc_strerror(status);
            assert(false);
        }
        
        int rh_id;
        status = nc_inq_varid(ncid, "amountofprecip", &rh_id);
        if(status != NC_NOERR) {
            cout << nc_strerror(status);
            assert(false);
        }
        
        int rh_vals[HRAPY][HRAPX];
        status = nc_get_vara_int(ncid, rh_id, start, value_count, (int*)rh_vals);
        if(status != NC_NOERR) {
            cout << nc_strerror(status);
            assert(false);
        }
    }

    std::cout << "Hello, World!\n";
    return 0;
}

note there’s no errors, however rows > 100 return garbage, row 100 looks like:

[ -71   76   96   37   20    8  -67  -47  -89   62   52  -52   78   86  -62
   60   46   44  -68  -44  -34   28   30  -30   -2   -1   14  -64  -68  -63
  -88  -86  -95   40  -70  -55    5  -56  -50  -61   88   57   45  -73   -3
  -45   19    5  -73   -6  -

whereas row 101 looks like:

[ 4325376  2818048   393215 -3997697 -4063233 -1114113 -1310720  4915199
 -6488064  5832703 -1114113 -2228225 -2686977 -3932160  6160384  3276799
  -720896  3670015 -4063232  6225919 -5636096  1966080  3014655 -4063233
 -5308416  1114112  3407871 -4653057 

opening the same file with nc_open does not return corrupt data.