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main.cpp
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162 lines (134 loc) · 4.6 KB
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#include <iostream>
#include <string>
#include <string>
#include <fstream>
#include <unistd.h>
// 网上找到的一个算法，至少读取没有爆乱码
static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline bool is_base64(const char c)
{
return (isalnum(c) || (c == '+') || (c == '/'));
}
std::string base64_encode(const char *bytes_to_encode, unsigned int in_len)
{
std::string ret;
int i = 0;
int j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
while (in_len--)
{
char_array_3[i++] = *(bytes_to_encode++);
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;
}
std::string base64_decode(std::string const &encoded_string)
{
int in_len = (int)encoded_string.size();
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4], char_array_3[3];
std::string ret;
while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_]))
{
char_array_4[i++] = encoded_string[in_];
in_++;
if (i == 4)
{
for (i = 0; i < 4; i++)
char_array_4[i] = base64_chars.find(char_array_4[i]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; (i < 3); i++)
ret += char_array_3[i];
i = 0;
}
}
if (i)
{
for (j = i; j < 4; j++)
char_array_4[j] = 0;
for (j = 0; j < 4; j++)
char_array_4[j] = base64_chars.find(char_array_4[j]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; (j < i - 1); j++)
ret += char_array_3[j];
}
return ret;
}
int main(int argc, char **argv)
{
// 先删除拷贝文件
if (0 == access("./LBJ_copy.jpg", F_OK))
unlink("./LBJ_copy.jpg");
std::cout << "Waiting to remove old copy files." << std::endl;
sleep(1);
std::fstream f;
f.open("./LBJ.jpg", std::ios::in | std::ios::binary);
f.seekg(0, std::ios_base::end); // 设置偏移量至文件结尾
std::streampos sp = f.tellg(); // 获取文件大小
int size = sp;
char *buffer = (char *)malloc(sizeof(char) * size);
f.seekg(0, std::ios_base::beg); // 设置偏移量至文件开头
f.read(buffer, size); // 将文件内容读入buffer
std::cout << "file size:" << size << '\n'
<< std::endl;
std::string imgBase64 = base64_encode(buffer, size); // 编码
std::cout << "img base64 encode size: " << imgBase64.size() << std::endl;
std::cout << "img base64 encode: " << imgBase64 << '\n'
<< std::endl;
std::string imgdecode64 = base64_decode(imgBase64); // 解码
std::cout << "img base64 decode size: " << imgdecode64.size() << std::endl;
// std::cout << "img base64 decode: " << imgdecode64 << std::endl; // 乱码不打印
const char *p = imgdecode64.c_str();
std::ofstream fout("./LBJ_copy.jpg", std::ios::out | std::ios::binary);
if (!fout)
{
std::cout << "error" << std::endl;
}
else
{
std::cout << "Success!" << std::endl;
fout.write(p, size);
}
fout.close();
return 0;
}