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#pragma once
#include <forstio/string_literal.hpp>
#include <forstio/error.hpp>
#include <forstio/codec/data.hpp>
#include <netcdf.h>
#include <netcdf_mem.h>
namespace saw {
namespace encode {
/**
* Template type hint
*/
struct Netcdf {};
}
/**
* Class representing the files system netcdf file
*/
template<typename Schema>
class data<Schema, encode::Netcdf> {
private:
std::vector<uint8_t> buff_;
public:
data() = default;
data(std::vector<uint8_t> buff):
buff_{std::move(buff)}
{}
template<size_t N>
data(const std::array<uint8_t, N>& arr):
buff_{arr.begin(), arr.end()}
{}
std::vector<uint8_t>& get_data() {
return buff_;
}
const std::vector<uint8_t>& get_data() const {
return buff_;
}
};
template<typename Schema>
class codec<Schema, encode::Netcdf>{
static_assert(always_false<Schema,encode::Netcdf>, "NetCDF only supports Structs as a root object");
};
}
#include "netcdf.tmpl.hpp"
namespace saw {
template<typename... Vals, string_literal... Keys>
class codec<schema::Struct<schema::Member<Vals,Keys>...>, encode::Netcdf> {
private:
using Schema = schema::Struct<schema::Member<Vals,Keys>...>;
public:
SAW_FORBID_COPY(codec);
SAW_DEFAULT_MOVE(codec);
/**
* Default constructor
*/
codec() = default;
/**
* Encoder function
*/
template<typename FromEncoding>
error_or<void> encode(const data<Schema, FromEncoding>& from, data<Schema,encode::Netcdf>& to) {
int rc{};
int ncid{};
rc = nc_create_mem("forstio_internal_write_memory", 0,/*NC_NETCDF4, */0, &ncid);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
{
auto eov = impl::netcdf_encode<Schema,FromEncoding>::encode_meta(from, ncid);
if(eov.is_error()){
nc_close(ncid);
return eov;
}
}
rc = nc_enddef(ncid);
if(rc != NC_NOERR){
nc_close(ncid);
return make_error<err::critical>();
}
{
auto eov = impl::netcdf_encode<Schema,FromEncoding>::encode(from, ncid);
if(eov.is_error()){
nc_close(ncid);
return eov;
}
}
NC_memio nc_memio;
rc = nc_close_memio(ncid, &nc_memio);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
if(!nc_memio.memory || nc_memio.size == 0){
return make_error<err::critical>();
}
try {
to.get_data().resize(nc_memio.size);
}catch(const std::exception& e){
(void) e;
return make_error<err::out_of_memory>();
}
for(std::size_t i = 0; i < nc_memio.size; ++i){
to.get_data().at(i) = static_cast<uint8_t*>(nc_memio.memory)[i];
}
free(nc_memio.memory);
nc_memio.memory = nullptr;
return void_t{};
}
/**
* Decoder function
*/
template<typename ToEncoding>
error_or<void> decode(data<Schema, encode::Netcdf>& from_decode, data<Schema,ToEncoding>& to_decode) {
int ncid{};
int rc{};
rc = nc_open_mem("forstio_internal_read_memory", NC_NOWRITE, from_decode.get_data().size(), &from_decode.get_data()[0], &ncid);
if(rc != NC_NOERR){
// Don't know how to get the error, so fail critically.
return make_error<err::critical>();
}
auto eov = impl::netcdf_decode<Schema, ToEncoding>::decode(to_decode, ncid);
nc_close(ncid);
return eov;
}
};
}
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