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cnpy.h
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//Copyright (C) 2011 Carl Rogers
//Released under MIT License
//license available in LICENSE file, or at http://www.opensource.org/licenses/mit-license.php
#ifndef LIBCNPY_H_
#define LIBCNPY_H_
#include<string>
#include<cstring>
#include<stdexcept>
#include<sstream>
#include<vector>
#include<cstdio>
#include<typeinfo>
#include<iostream>
#include<cassert>
#include<zlib.h>
#include<map>
#include<memory>
#include<stdint.h>
#include<numeric>
namespace cnpy {
struct NpyArray {
NpyArray(const std::vector<size_t>& _shape, size_t _word_size,
char _type, bool _fortran_order)
: shape(_shape), word_size(_word_size),
type(_type), fortran_order(_fortran_order) {
num_vals = 1;
for(size_t i = 0;i < shape.size();i++) num_vals *= shape[i];
data_holder = std::shared_ptr<std::vector<char>>(
new std::vector<char>(num_vals * word_size));
}
NpyArray() : shape(0), word_size(0), type(0), fortran_order(0), num_vals(0) {}
template<typename T>
T* data() {
return reinterpret_cast<T*>(&(*data_holder)[0]);
}
template<typename T>
const T* data() const {
return reinterpret_cast<T*>(&(*data_holder)[0]);
}
template<typename T>
std::vector<T> as_vec() const {
const T* p = data<T>();
return std::vector<T>(p, p+num_vals);
}
size_t num_bytes() const {
return data_holder->size();
}
std::shared_ptr<std::vector<char>> data_holder;
std::vector<size_t> shape;
size_t word_size;
char type;
bool fortran_order;
size_t num_vals;
};
using npz_t = std::map<std::string, NpyArray>;
std::vector<char> create_npy_header(const std::vector<size_t>& shape,
size_t word_size, char type);
void parse_npy_header(FILE* fp,size_t& word_size, char& type,
std::vector<size_t>& shape, bool& fortran_order);
void parse_npy_header(unsigned char* buffer, size_t& word_size, char& type,
std::vector<size_t>& shape, bool& fortran_order);
void parse_zip_footer(FILE* fp, uint16_t& nrecs, size_t& global_header_size,
size_t& global_header_offset);
npz_t npz_load(std::string fname);
NpyArray npz_load(std::string fname, std::string varname);
NpyArray npy_load(std::string fname);
template<typename T>
std::vector<char>& operator+=(std::vector<char>& lhs, const T rhs);
template<>
std::vector<char>& operator+=(std::vector<char>& lhs, const std::string rhs);
template<>
std::vector<char>& operator+=(std::vector<char>& lhs, const char* rhs);
template<typename T>
void npy_save(std::string fname, const T* data,
const std::vector<size_t> shape, std::string mode = "w");
template<typename T>
void npy_save(std::string fname, const std::vector<T> data,
std::string mode = "w");
template<typename T>
void npz_save(std::string zipname, std::string fname,
const T* data, const std::vector<size_t>& shape,
std::string mode = "w");
template<typename T>
void npz_save(std::string zipname, std::string fname,
const std::vector<T> &data, std::string mode = "w");
template<typename T>
void npz_save(std::string zipname, std::string fname,
NpyArray &array, std::string mode = "w");
template<typename T>
void npz_add_array(npz_t &map, std::string fname,
const T* data, const std::vector<size_t> shape);
template<typename T>
void npz_add_array(npz_t &map, std::string fname,
const std::vector<T> &data);
void npz_save_all(std::string zipname, npz_t &map);
} // namespace cnpy
#endif