Created
July 24, 2019 21:22
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#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <io.h> | |
#include <fcntl.h> | |
#include <string.h> | |
#include <array> | |
#include <Rcpp.h> | |
using namespace Rcpp; | |
// [[Rcpp::plugins(cpp11)]] | |
// [[Rcpp::export]] | |
int makeFdForWrite(std::string filename) { | |
int fd = open(filename.c_str(), _O_WRONLY | _O_CREAT | _O_BINARY, _S_IWRITE); | |
if(fd == -1) Rcpp::stop("somthing went wrong :("); | |
return fd; | |
} | |
// [[Rcpp::export]] | |
void writeToFd(int fd) { | |
std::array<unsigned char, 17> mydata = | |
{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; | |
int bytes_written = write(fd, mydata.data(), mydata.size()); | |
if(bytes_written != mydata.size()) Rcpp::stop("somthing went wrong :("); | |
close(fd); | |
} | |
// [[Rcpp::export]] | |
int makeFdForRead(std::string filename) { | |
int fd = open(filename.c_str(), O_RDONLY | _O_BINARY); | |
if(fd == -1) Rcpp::stop("somthing went wrong :("); | |
return fd; | |
} | |
// [[Rcpp::export]] | |
std::vector<unsigned char> readFromFd(int fd) { | |
std::vector<unsigned char> output; | |
std::array<unsigned char, 4> temp = {0,0,0,0}; | |
int bytes_read; | |
while( (bytes_read = read(fd, temp.data(), 4)) > 0 ) { | |
output.insert(std::end(output), std::begin(temp), std::begin(temp) + bytes_read); | |
} | |
close(fd); | |
return output; | |
} | |
/*** R | |
setwd("N:/") | |
write_fd <- makeFdForWrite("fdtest_windows.bin") | |
writeToFd(write_fd) | |
readBin("fdtest_windows.bin", what="raw", n=1e9) | |
read_fd <- makeFdForRead("fdtest_windows.bin") | |
readFromFd(read_fd) | |
*/ |
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