对图片进行Base64转码和解码
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对图片进行Base64转码和解码
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Base64代碼
base64.c
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
// bindata待編碼數據buffer base64 編碼后數據buffer binlength 待編碼數據大小
char* base64_encode(const unsigned char* bindata, char* base64, int binlength);
// base64編碼字符串 bindata 解碼后buffer
int base64_decode(const char* base64, unsigned char* bindata);
int main()
{
FILE* fp = NULL;
unsigned int imageSize; //圖片字節數
char* imageBin;
char* imageBase64;
char* imageOutput;
size_t result;
char* ret;
unsigned int base64StrLength;
fp = fopen("lena.bmp", "rb"); //待編碼圖片
if (NULL == fp)
{
printf("file open file");
return -1;
}
//獲取圖片大小
fseek(fp, 0L, SEEK_END);
imageSize = ftell(fp);
fseek(fp, 0L, SEEK_SET);
//分配內存存儲整個圖片
imageBin = (char*)malloc(sizeof(char) * imageSize);
if (NULL == imageBin)
{
printf("malloc failed");
return -1;
}
//讀取圖片
result = fread(imageBin, 1, imageSize, fp);
if (result != imageSize)
{
printf("file read failed");
return -1;
}
fclose(fp);
//分配編碼后圖片所在buffer
imageBase64 = (char*)malloc(sizeof(char) * imageSize * 2);//因為編碼一版會比源數據大1/3的樣子，這里直接申請源文件一倍的空間
if (NULL == imageBase64)
{
printf("malloc failed");
return -1;
}
//base64編碼
base64_encode(imageBin, imageBase64, imageSize);
base64StrLength = strlen(imageBase64);
printf("base64 str length:%d
", base64StrLength);
printf("將圖片讀入out.txt中
");
//分配存儲解碼數據buffer
imageOutput = (char*)malloc(sizeof(char) * imageSize);//解碼后應該和源圖片大小一致
if (NULL == imageBase64)
{
printf("malloc failed");
return -1;
}
base64_decode(imageBase64, imageOutput);
fp = fopen("output.bmp", "wb");
if (NULL == fp)
{
printf("file open file");
return -1;
}
fwrite(imageOutput, 1, imageSize, fp);
fclose(fp);
free(imageBin);
free(imageBase64);
free(imageOutput);
return 0;
}
const char* base64char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char* base64_encode(const unsigned char* bindata, char* base64, int binlength)
{
int i, j;
unsigned char current;
for (i = 0, j = 0; i < binlength; i += 3)
{
current = (bindata[i] >> 2);
current &= (unsigned char)0x3F;
base64[j++] = base64char[(int)current];
current = ((unsigned char)(bindata[i] << 4)) & ((unsigned char)0x30);
if (i + 1 >= binlength)
{
base64[j++] = base64char[(int)current];
base64[j++] = '=';
base64[j++] = '=';
break;
}
current |= ((unsigned char)(bindata[i + 1] >> 4)) & ((unsigned char)0x0F);
base64[j++] = base64char[(int)current];
current = ((unsigned char)(bindata[i + 1] << 2)) & ((unsigned char)0x3C);
if (i + 2 >= binlength)
{
base64[j++] = base64char[(int)current];
base64[j++] = '=';
break;
}
current |= ((unsigned char)(bindata[i + 2] >> 6)) & ((unsigned char)0x03);
base64[j++] = base64char[(int)current];
current = ((unsigned char)bindata[i + 2]) & ((unsigned char)0x3F);
base64[j++] = base64char[(int)current];
}
base64[j] = '';
return 0;
}
int base64_decode(const char* base64, unsigned char* bindata)
{
int i, j;
unsigned char k;
unsigned char temp[4];
for (i = 0, j = 0; base64[i] != ''; i += 4)
{
memset(temp, 0xFF, sizeof(temp));
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i])
temp[0] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 1])
temp[1] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 2])
temp[2] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 3])
temp[3] = k;
}
bindata[j++] = ((unsigned char)(((unsigned char)(temp[0] << 2)) & 0xFC)) |
((unsigned char)((unsigned char)(temp[1] >> 4) & 0x03));
if (base64[i + 2] == '=')
break;
bindata[j++] = ((unsigned char)(((unsigned char)(temp[1] << 4)) & 0xF0)) |
((unsigned char)((unsigned char)(temp[2] >> 2) & 0x0F));
if (base64[i + 3] == '=')
break;
bindata[j++] = ((unsigned char)(((unsigned char)(temp[2] << 6)) & 0xF0)) |
((unsigned char)(temp[3] & 0x3F));
}
return j;
}
unistd.h
#pragma once /** This file is part of the Mingw32 package. unistd.h maps (roughly) to io.h */ #ifndef _UNISTD_H #define _UNISTD_H #include <io.h> #include <process.h> #endif /* _UNISTD_H */
將Base64編碼存于文件中
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
// bindata待編碼數據buffer base64 編碼后數據buffer binlength 待編碼數據大小
char* base64_encode(const unsigned char* bindata, char* base64, int binlength);
// base64編碼字符串 bindata 解碼后buffer
int base64_decode(const char* base64, unsigned char* bindata);
int main()
{
FILE* fp = NULL;
unsigned int imageSize; //圖片字節數
char* imageBin;
char* imageBase64;
char* imageOutput;
size_t result;
char* ret;
unsigned int base64StrLength;
fp = fopen("lena.bmp", "rb"); //待編碼圖片
if (NULL == fp)
{
printf("file open file");
return -1;
}
//獲取圖片大小
fseek(fp, 0L, SEEK_END);
imageSize = ftell(fp);
fseek(fp, 0L, SEEK_SET);
//分配內存存儲整個圖片
imageBin = (char*)malloc(sizeof(char) * imageSize);
if (NULL == imageBin)
{
printf("malloc failed");
return -1;
}
//讀取圖片
result = fread(imageBin, 1, imageSize, fp);
if (result != imageSize)
{
printf("file read failed");
return -1;
}
fclose(fp);
//分配編碼后圖片所在buffer
imageBase64 = (char*)malloc(sizeof(char) * imageSize * 2);//因為編碼一版會比源數據大1/3的樣子，這里直接申請源文件一倍的空間
if (NULL == imageBase64)
{
printf("malloc failed");
return -1;
}
//base64編碼
base64_encode(imageBin, imageBase64, imageSize);
base64StrLength = strlen(imageBase64);
printf("base64 str length:%d
", base64StrLength);
printf("將圖片讀入out.txt中
");
FILE* file = fopen("out.txt", "wb");
if (file == NULL)
{
printf("Error!");
exit(1);
}
//將Base64編碼寫入文件
int i = 0;
while (imageBase64[i] != NULL)
{
fputc(imageBase64[i++], file);
}
fclose(file);
//分配存儲解碼數據buffer
imageOutput = (char*)malloc(sizeof(char) * imageSize);//解碼后應該和源圖片大小一致
if (NULL == imageBase64)
{
printf("malloc failed");
return -1;
}
base64_decode(imageBase64, imageOutput);
fp = fopen("output.bmp", "wb");
if (NULL == fp)
{
printf("file open file");
return -1;
}
fwrite(imageOutput, 1, imageSize, fp);
fclose(fp);
free(imageBin);
free(imageBase64);
free(imageOutput);
return 0;
}
const char* base64char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char* base64_encode(const unsigned char* bindata, char* base64, int binlength)
{
int i, j;
unsigned char current;
for (i = 0, j = 0; i < binlength; i += 3)
{
current = (bindata[i] >> 2);
current &= (unsigned char)0x3F;
base64[j++] = base64char[(int)current];
current = ((unsigned char)(bindata[i] << 4)) & ((unsigned char)0x30);
if (i + 1 >= binlength)
{
base64[j++] = base64char[(int)current];
base64[j++] = '=';
base64[j++] = '=';
break;
}
current |= ((unsigned char)(bindata[i + 1] >> 4)) & ((unsigned char)0x0F);
base64[j++] = base64char[(int)current];
current = ((unsigned char)(bindata[i + 1] << 2)) & ((unsigned char)0x3C);
if (i + 2 >= binlength)
{
base64[j++] = base64char[(int)current];
base64[j++] = '=';
break;
}
current |= ((unsigned char)(bindata[i + 2] >> 6)) & ((unsigned char)0x03);
base64[j++] = base64char[(int)current];
current = ((unsigned char)bindata[i + 2]) & ((unsigned char)0x3F);
base64[j++] = base64char[(int)current];
}
base64[j] = '';
return 0;
}
int base64_decode(const char* base64, unsigned char* bindata)
{
int i, j;
unsigned char k;
unsigned char temp[4];
for (i = 0, j = 0; base64[i] != ''; i += 4)
{
memset(temp, 0xFF, sizeof(temp));
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i])
temp[0] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 1])
temp[1] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 2])
temp[2] = k;
}
for (k = 0; k < 64; k++)
{
if (base64char[k] == base64[i + 3])
temp[3] = k;
}
bindata[j++] = ((unsigned char)(((unsigned char)(temp[0] << 2)) & 0xFC)) |
((unsigned char)((unsigned char)(temp[1] >> 4) & 0x03));
if (base64[i + 2] == '=')
break;
bindata[j++] = ((unsigned char)(((unsigned char)(temp[1] << 4)) & 0xF0)) |
((unsigned char)((unsigned char)(temp[2] >> 2) & 0x0F));
if (base64[i + 3] == '=')
break;
bindata[j++] = ((unsigned char)(((unsigned char)(temp[2] << 6)) & 0xF0)) |
((unsigned char)(temp[3] & 0x3F));
}
return j;
}
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