i2pd-tools/i2pbase64.cpp

#include <unistd.h>
#include <fcntl.h>
#include <iostream>
#include <fstream>
#include <functional>
#include <cassert>
#include "Base.h"

const size_t BUFFSZ = 1024;

static int printHelp(const char * exe, int exitcode)
{
	std::cout << "usage: " << exe << " [-d] [filename]" << std::endl;
	return exitcode;
}

template <typename InCh, typename OutCh, size_t isz, size_t osz>
static int operate(std::function<std::size_t(const InCh *, size_t, OutCh *, size_t)> f, int infile, int outfile)
{
	InCh inbuf[isz];
	OutCh outbuf[osz];
	ssize_t sz;
	size_t outsz;
	while((sz = read(infile, inbuf, sizeof(inbuf))) > 0)
	{
		outsz = f(inbuf, sz, outbuf, sizeof(outbuf));
		if(outsz && outsz <= sizeof(outbuf))
		{
			write(outfile, outbuf, outsz);
		}
		else
		{
			return -1;
		}
	}
	return errno;
}

int main(int argc, char * argv[])
{
	int opt;
	bool decode = false;
	int infile = 0;
	while((opt = getopt(argc, argv, "dh")) != -1)
	{
		switch(opt)
		{
		case 'h':
			return printHelp(argv[0], 0);
		case 'd':
			decode = true;
			break;
		default:
			continue;
		}
	}

	if (argc - optind > 1)
	{
		return printHelp(argv[0], -1);
	}

	if (optind < argc)
	{
		infile = open(argv[optind], O_RDONLY);
		if(infile == -1) {
			perror(argv[optind]);
			return -1;
		}
	}
	int retcode = 0;
	if(decode)
	{
		retcode = operate<char, uint8_t, BUFFSZ*4, BUFFSZ*3>(i2p::data::Base64ToByteStream, infile, 1);
	}
	else
	{
		retcode = operate<uint8_t, char, BUFFSZ*3, BUFFSZ*4>(&i2p::data::ByteStreamToBase64, infile, 1);
	}
	close(infile);
	return retcode;
}