FileHelper.cpp

#include "FileHelper.h"
#include <fstream>

#ifndef _WIN32
#include <sys/stat.h>
#endif

static const std::string base64_chars =
			"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
			"abcdefghijklmnopqrstuvwxyz"
			"0123456789+/";

inline bool exists(std::string& path) {
	struct stat buffer;
	return stat(path.c_str(), &buffer) == 0;
}

FileInfo get_file_info(std::string& path, bool get_contents)
{
	FileInfo result = { 0 };
	if (exists(path))
	{
		std::ifstream file(path, std::ios::binary | std::ios::ate);
		std::streamsize size = file.tellg();
		result.size = size;
		if (get_contents)
		{
			file.seekg(0, std::ios::beg);

			std::vector<char> buffer(size);
			file.read(buffer.data(), size);
			if (buffer.size() == 0 && size == 0)
			{
				// We will get here if the file exists and it is empty.
				buffer.push_back(""[0]);
			}

			result.contents = buffer;
		}
	}
	else
	{
		return {-1};
	}

	return result;
}

std::string base64_encode(const char *path, unsigned int len)
{
	std::string ret;
	int i = 0;
	int j = 0;
	unsigned char char_array_3[3];
	unsigned char char_array_4[4];

	while (len--) {
		char_array_3[i++] = *(path++);
		if (i == 3) {
			char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
			char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
			char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
			char_array_4[3] = char_array_3[2] & 0x3f;

			for (i = 0; (i <4); i++)
				ret += base64_chars[char_array_4[i]];
			i = 0;
		}
	}

	if (i)
	{
		for (j = i; j < 3; j++)
			char_array_3[j] = '\0';

		char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
		char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
		char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
		char_array_4[3] = char_array_3[2] & 0x3f;

		for (j = 0; (j < i + 1); j++)
			ret += base64_chars[char_array_4[j]];

		while ((i++ < 3))
			ret += '=';

	}

	return ret;

}