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using System;
using System.IO;
using System.Linq;
namespace MyBase64 {
public static class ZxBase64 {
private readonly static int[] H6 = { 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, 32, 32, 32, 32, 33, 33, 33, 33, 34, 34, 34, 34, 35, 35, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 39, 39, 39, 39, 40, 40, 40, 40, 41, 41, 41, 41, 42, 42, 42, 42, 43, 43, 43, 43, 44, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 46, 47, 47, 47, 47, 48, 48, 48, 48, 49, 49, 49, 49, 50, 50, 50, 50, 51, 51, 51, 51, 52, 52, 52, 52, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55, 56, 56, 56, 56, 57, 57, 57, 57, 58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 61, 61, 61, 61, 62, 62, 62, 62, 63, 63, 63, 63 };
private readonly static int[] L2 = { 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48, 0, 16, 32, 48 };
private readonly static int[] H4 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 };
private readonly static int[] L4 = { 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60 };
private readonly static int[] H2 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 };
private readonly static int[] L6 = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 };
const string maps = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
/// <summary>
/// an fast Base64 function by QQ:20437023 liaisonme@hotmail.com
/// MIT License Copyright (c) 2018 zhangxx2015
///
/// 手工实现的一个base64编码算法,性能由于dotnet自带函数, 仅 45 行代码
///
/// A handmade Base64 coding algorithm, Performance is better than Convert.ToBase64String. only 45 lines.
///
///
/// # benchmark
/// target file size:144749672 bytes
/// result compare is:True
/// ms func proc elapse:1357 ms
/// my func proc elapse:249 ms
/// </summary>
public static char[] ToBase64String(byte[] raws) {
var bytesCount = raws.Length;
var bodysCount = bytesCount;
var bytesIndex = 0;
var b64Chars2 = new char[4 * (bytesCount / 3 + (bytesCount % 3 > 0 ? 1 : 0))];
var outIndex = 0;
while (bodysCount >= 3) {
b64Chars2[outIndex++] = maps[H6[raws[bytesIndex + 0]]];
b64Chars2[outIndex++] = maps[L2[raws[bytesIndex + 0]] | H4[raws[bytesIndex + 1]]];
b64Chars2[outIndex++] = maps[L4[raws[bytesIndex + 1]] | H2[raws[bytesIndex + 2]]];
b64Chars2[outIndex++] = maps[L6[raws[bytesIndex + 2]]];
bytesIndex += 3;
bodysCount -= 3;
}
if (bytesCount % 3 <= 0)
return b64Chars2;
b64Chars2[outIndex + 0] = '=';
b64Chars2[outIndex + 1] = '=';
b64Chars2[outIndex + 2] = '=';
b64Chars2[outIndex + 3] = '=';
if (bytesIndex < bytesCount) {
b64Chars2[outIndex++] = maps[H6[raws[bytesIndex]]];
var idx = L2[raws[bytesIndex++]];
if (bytesIndex < bytesCount)
idx |= H4[raws[bytesIndex]];
b64Chars2[outIndex++] = maps[idx];
}
if (bytesIndex < bytesCount) {
var idx = L4[raws[bytesIndex++]];
if (bytesIndex < bytesCount)
idx |= H2[raws[bytesIndex]];
b64Chars2[outIndex++] = maps[idx];
}
if (bytesIndex < bytesCount)
b64Chars2[outIndex] = maps[L6[raws[bytesIndex]]];
return b64Chars2;
}
}
class Program {
static void Main(string[] args) {
var file = @"C:\Windows\System32\MRT.exe";
var bytes = File.ReadAllBytes(file);
var ticks1 = Environment.TickCount;
var b64Chars1 = ZxBase64.ToBase64String(bytes);
ticks1 = Environment.TickCount - ticks1;
var ticks2 = Environment.TickCount;
var b64Chars2 = Convert.ToBase64String(bytes);
ticks2 = Environment.TickCount - ticks2;
var compare = b64Chars1.Length == b64Chars2.Length;
if (compare)
if (b64Chars1.Where((t, i) => t != b64Chars2[i]).Any()) compare = false;
Console.WriteLine("target file size:{0} bytes", bytes.Length);
Console.WriteLine("result compare is:{0}", compare);
Console.WriteLine("ms func proc elapse:{0:d3} ms", ticks1);
Console.WriteLine("my func proc elapse:{0:d3} ms", ticks2);
Console.WriteLine("done");
Console.ReadLine();
}
}
}
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