C++——实现base64编码

不废话，直接开整

使用C++的文件操作，读取图片，实现base64编码，编码结果打印到控制台（未实现文件写入），测试可通过👉图片转Base64编码 - 在线工具 - OKTools

代码如下

#include <iostream>
#include <fstream>

#define MAX 1200
using namespace std;

const char *base64_code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

void base64_encode(char *path1) {
    unsigned char buffer[MAX];

    ifstream file_read;
    file_read.open(path1, ios::binary);

    while (!file_read.eof()) {
        file_read.read((char *) buffer, MAX * sizeof(char));
        int num = file_read.gcount();

        int index[4];
        for (int i = 0; i < num / 3 * 3; i += 3) {
            index[0] = buffer[i] >> 2;
            index[1] = (buffer[i] & 0x03) << 4 | buffer[i + 1] >> 4;
            index[2] = (buffer[i + 1] & 0x0f) << 2 | buffer[i + 2] >> 6;
            index[3] = buffer[i + 2] & 0x3f;
            for (int j = 0; j < 4; ++j) {
                cout << base64_code[index[j]];
            }
        }
        if (num % 3 != 0) {
            index[0] = num % 3 == 1 ? buffer[num - 1] >> 2 : buffer[num - 2] >> 2;
            index[1] =
                    num % 3 == 1 ? (buffer[num - 1] & 0x03) << 4 : (buffer[num - 2] & 0x03) << 4 | buffer[num - 1] >> 4;
            index[2] = num % 3 == 1 ? 64 : (buffer[num - 1] & 0x0f) << 2;
            index[3] = 64;
            for (int j = 0; j < 4; ++j) {
                cout << base64_code[index[j]];
            }
        }
    }
    file_read.close();
}

int main() {
    base64_encode("C:\\Users\\LIN\\CLionProjects\\AlgorithmDemo\\demo.png");
    return 0;
}