Most efficient way to save binary code to file

问题

I have a string that only contains 1 and 0 and I need to save this to a .txt-File.
I also want it to be as small as possible. Since I have binary code, I can turn it into pretty much everything. Saving it as binary is not an option, since apparently every character will be a whole byte, even if it's a 1 or a 0.
I thought about turning my string into an Array of Byte but trying to convert "11111111" to Byte gave me a System.OverflowException.
My next thought was using an ASCII Codepage or something. But I don't know how reliable that is. Alternatively I could turn all of the 8-Bit pieces of my string into the corresponding numbers. 8 characters would turn into a maximum of 3 (255), which seems pretty nice to me. And since I know the highest individual number will be 255 I don't even need any delimiter for decoding.
But I'm sure there's a better way.
So:
What exactly is the best/most efficient way to store a string that only contains 1 and 0?

回答1:

You could represent all your data as 64 bit integers and then write them to a binary file:

// The string we are working with.
string str = @"1010101010010100010101101";
// The number of bits in a 64 bit integer!
int size = 64;
// Pad the end of the string with zeros so the length of the string is divisible by 64.
str += new string('0', str.Length % size);
// Convert each 64 character segment into a 64 bit integer.
long[] binary = new long[str.Length / size]
    .Select((x, idx) => Convert.ToInt64(str.Substring(idx * size, size), 2)).ToArray();
// Copy the result to a byte array.
byte[] bytes = new byte[binary.Length * sizeof(long)];
Buffer.BlockCopy(binary, 0, bytes, 0, bytes.Length);
// Write the result to file.
File.WriteAllBytes("MyFile.bin", bytes);

EDIT:

If you're only writing 64 bits then it's a one-liner:

File.WriteAllBytes("MyFile.bin", BitConverter.GetBytes(Convert.ToUInt64(str, 2)));

回答2:

I would suggest using BinaryWriter. Like this:

BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Create));

来源：https://stackoverflow.com/questions/34134383/most-efficient-way-to-save-binary-code-to-file

标签

encoding

binary