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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
//Copyright (C) 2011 Carl Rogers
//Released under MIT License
//license available in LICENSE file, or at http://www.opensource.org/licenses/mit-license.php
#include"cnpy.h"
#include<complex>
#include<cstdlib>
#include<algorithm>
#include<cstring>
#include<iomanip>
char cnpy::BigEndianTest() {
union
{
unsigned char x[2];
short y;
};
x[0] = 1;
x[1] = 0;
return y == 1 ? '<' : '>';
}
char cnpy::map_type(const std::type_info& t)
{
if(t == typeid(float) ) return 'f';
if(t == typeid(double) ) return 'f';
if(t == typeid(long double) ) return 'f';
if(t == typeid(int) ) return 'i';
if(t == typeid(char) ) return 'i';
if(t == typeid(short) ) return 'i';
if(t == typeid(long) ) return 'i';
if(t == typeid(long long) ) return 'i';
if(t == typeid(unsigned char) ) return 'u';
if(t == typeid(unsigned short) ) return 'u';
if(t == typeid(unsigned long) ) return 'u';
if(t == typeid(unsigned long long) ) return 'u';
if(t == typeid(unsigned int) ) return 'u';
if(t == typeid(bool) ) return 'b';
if(t == typeid(std::complex<float>) ) return 'c';
if(t == typeid(std::complex<double>) ) return 'c';
if(t == typeid(std::complex<long double>) ) return 'c';
else return '?';
}
template<> std::vector<char>& cnpy::operator+=(std::vector<char>& lhs, const std::string rhs) {
lhs.insert(lhs.end(),rhs.begin(),rhs.end());
return lhs;
}
template<> std::vector<char>& cnpy::operator+=(std::vector<char>& lhs, const char* rhs) {
//write in little endian
size_t len = strlen(rhs);
lhs.reserve(len);
for(size_t byte = 0; byte < len; byte++) {
lhs.push_back(rhs[byte]);
}
return lhs;
}
void cnpy::parse_npy_header(FILE* fp, unsigned int& word_size, unsigned int*& shape, unsigned int& ndims, bool& fortran_order) {
char buffer[256];
size_t res = fread(buffer,sizeof(char),11,fp);
if(res != 11)
throw std::runtime_error("parse_npy_header: failed fread");
std::string header = fgets(buffer,256,fp);
cnpy_assert(header[header.size()-1] == '\n');
size_t loc1, loc2;
//fortran order
loc1 = header.find("fortran_order")+16;
fortran_order = (header.substr(loc1,5) == "True" ? true : false);
//shape
loc1 = header.find("(");
loc2 = header.find(")");
std::string str_shape = header.substr(loc1+1,loc2-loc1-1);
if(str_shape[str_shape.size()-1] == ',') ndims = 1;
else ndims = (unsigned)std::count(str_shape.begin(),str_shape.end(),',')+1;
shape = new unsigned int[ndims];
for(unsigned int i = 0;i < ndims;i++) {
loc1 = str_shape.find(",");
shape[i] = atoi(str_shape.substr(0,loc1).c_str());
str_shape = str_shape.substr(loc1+1);
}
//endian, word size, data type
//byte order code | stands for not applicable.
//not sure when this applies except for byte array
loc1 = header.find("descr")+9;
bool littleEndian = (header[loc1] == '<' || header[loc1] == '|' ? true : false);
cnpy_assert(littleEndian);
//char type = header[loc1+1];
//assert(type == map_type(T));
std::string str_ws = header.substr(loc1+2);
loc2 = str_ws.find("'");
word_size = atoi(str_ws.substr(0,loc2).c_str());
}
void cnpy::parse_zip_footer(FILE* fp, unsigned short& nrecs, unsigned int& global_header_size, unsigned int& global_header_offset)
{
std::vector<char> footer(22);
fseek(fp,-22,SEEK_END);
size_t res = fread(&footer[0],sizeof(char),22,fp);
if(res != 22)
throw std::runtime_error("parse_zip_footer: failed fread");
unsigned short disk_no, disk_start, nrecs_on_disk, comment_len;
disk_no = *(unsigned short*) &footer[4];
disk_start = *(unsigned short*) &footer[6];
nrecs_on_disk = *(unsigned short*) &footer[8];
nrecs = *(unsigned short*) &footer[10];
global_header_size = *(unsigned int*) &footer[12];
global_header_offset = *(unsigned int*) &footer[16];
comment_len = *(unsigned short*) &footer[20];
cnpy_assert(disk_no == 0);
cnpy_assert(disk_start == 0);
cnpy_assert(nrecs_on_disk == nrecs);
cnpy_assert(comment_len == 0);
}
cnpy::NpyArray load_the_npy_file(FILE* fp) {
unsigned int* shape;
unsigned int ndims, word_size;
bool fortran_order;
cnpy::parse_npy_header(fp,word_size,shape,ndims,fortran_order);
unsigned long long size = 1; //long long so no overflow when multiplying by word_size
for(unsigned int i = 0;i < ndims;i++) size *= shape[i];
cnpy::NpyArray arr;
arr.word_size = word_size;
arr.shape = std::vector<unsigned int>(shape,shape+ndims);
delete[] shape;
arr.data = new char[size*word_size];
arr.fortran_order = fortran_order;
size_t nread = fread(arr.data,word_size,size,fp);
if(nread != size)
throw std::runtime_error("load_the_npy_file: failed fread");
return arr;
}
cnpy::npz_t cnpy::npz_load(std::string fname) {
FILE* fp = fopen(fname.c_str(),"rb");
if(!fp) printf("npz_load: Error! Unable to open file %s!\n",fname.c_str());
cnpy_assert(fp);
cnpy::npz_t arrays;
while(1) {
std::vector<char> local_header(30);
size_t headerres = fread(&local_header[0],sizeof(char),30,fp);
if(headerres != 30)
throw std::runtime_error("npz_load: failed fread");
//if we've reached the global header, stop reading
if(local_header[2] != 0x03 || local_header[3] != 0x04) break;
//read in the variable name
unsigned short name_len = *(unsigned short*) &local_header[26];
std::string varname(name_len,' ');
size_t vname_res = fread(&varname[0],sizeof(char),name_len,fp);
if(vname_res != name_len)
throw std::runtime_error("npz_load: failed fread");
//erase the lagging .npy
varname.erase(varname.end()-4,varname.end());
//read in the extra field
unsigned short extra_field_len = *(unsigned short*) &local_header[28];
if(extra_field_len > 0) {
std::vector<char> buff(extra_field_len);
size_t efield_res = fread(&buff[0],sizeof(char),extra_field_len,fp);
if(efield_res != extra_field_len)
throw std::runtime_error("npz_load: failed fread");
}
arrays[varname] = load_the_npy_file(fp);
}
fclose(fp);
return arrays;
}
cnpy::NpyArray cnpy::npz_load(std::string fname, std::string varname) {
FILE* fp = fopen(fname.c_str(),"rb");
if(!fp) {
throw std::runtime_error("npz_load: Error! Unable to open file " + fname + "!\n");
}
while(1) {
std::vector<char> local_header(30);
size_t header_res = fread(&local_header[0],sizeof(char),30,fp);
if(header_res != 30)
throw std::runtime_error("npz_load: failed fread");
//if we've reached the global header, stop reading
if(local_header[2] != 0x03 || local_header[3] != 0x04) break;
//read in the variable name
unsigned short name_len = *(unsigned short*) &local_header[26];
std::string vname(name_len,' ');
size_t vname_res = fread(&vname[0],sizeof(char),name_len,fp);
if(vname_res != name_len)
throw std::runtime_error("npz_load: failed fread");
vname.erase(vname.end()-4,vname.end()); //erase the lagging .npy
//read in the extra field
unsigned short extra_field_len = *(unsigned short*) &local_header[28];
fseek(fp,extra_field_len,SEEK_CUR); //skip past the extra field
if(vname == varname) {
NpyArray array = load_the_npy_file(fp);
fclose(fp);
return array;
}
else {
//skip past the data
unsigned int size = *(unsigned int*) &local_header[22];
fseek(fp,size,SEEK_CUR);
}
}
fclose(fp);
throw std::runtime_error("npz_load: Error! Variable name " + varname + " not found in " + fname + "!\n");
}
cnpy::NpyArray cnpy::npy_load(std::string fname) {
FILE* fp = fopen(fname.c_str(), "rb");
if(!fp) {
throw std::runtime_error("npy_load: Error! Unable to open file " + fname + "!\n");
}
NpyArray arr = load_the_npy_file(fp);
fclose(fp);
return arr;
}