【分享】C语言实现base64编解码图片
代码：```
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
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 >> 2) ;
current &= (unsigned char)0x3F;
base64 = base64char[(int)current];
current = ( (unsigned char)(bindata << 4 ) ) & ( (unsigned char)0x30 ) ;
if ( i + 1 >= binlength )
{
base64 = base64char[(int)current];
base64 = '=';
base64 = '=';
break;
}
current |= ( (unsigned char)(bindata >> 4) ) & ( (unsigned char) 0x0F );
base64 = base64char[(int)current];
current = ( (unsigned char)(bindata << 2) ) & ( (unsigned char)0x3C ) ;
if ( i + 2 >= binlength )
{
base64 = base64char[(int)current];
base64 = '=';
break;
}
current |= ( (unsigned char)(bindata >> 6) ) & ( (unsigned char) 0x03 );
base64 = base64char[(int)current];
current = ( (unsigned char)bindata ) & ( (unsigned char)0x3F ) ;
base64 = base64char[(int)current];
}
base64 = '\0';
return base64;
}
int base64_decode( const char * base64, unsigned char * bindata )
{
int i, j;
unsigned char k;
unsigned char temp;
for ( i = 0, j = 0; base64 != '\0' ; i += 4 )
{
memset( temp, 0xFF, sizeof(temp) );
for ( k = 0 ; k < 64 ; k ++ )
{
if ( base64char == base64 )
temp= k;
}
for ( k = 0 ; k < 64 ; k ++ )
{
if ( base64char == base64 )
temp= k;
}
for ( k = 0 ; k < 64 ; k ++ )
{
if ( base64char == base64 )
temp= k;
}
for ( k = 0 ; k < 64 ; k ++ )
{
if ( base64char == base64 )
temp= k;
}
bindata = ((unsigned char)(((unsigned char)(temp << 2))&0xFC)) |
((unsigned char)((unsigned char)(temp>>4)&0x03));
if ( base64 == '=' )
break;
bindata = ((unsigned char)(((unsigned char)(temp << 4))&0xF0)) |
((unsigned char)((unsigned char)(temp>>2)&0x0F));
if ( base64 == '=' )
break;
bindata = ((unsigned char)(((unsigned char)(temp << 6))&0xF0)) |
((unsigned char)(temp&0x3F));
}
return j;
}
int main()
{
//打开图片
FILE *fp = NULL;
unsigned int size; //图片字节数
char *buffer;
char *buffer1;
size_t result;
char *ret1;
unsigned int length;
fp = fopen("tc2.jpg","rb");
if (NULL == fp)
{
printf("open_error");
exit(1);
}
//获取图片大小
fseek(fp, 0L, SEEK_END);
size = ftell(fp);
fseek(fp, 0L, SEEK_SET);
//分配内存存储整个图片
buffer = (char *)malloc((size/4+1)*4);
if (NULL == buffer)
{
printf("memory_error");
exit(2);
}
//将图片拷贝到buffer
result = fread(buffer, 1, size, fp);
if (result != size)
{
printf("reading_error");
exit (3);
}
fclose(fp);
//base64编码
buffer1 = (char *)malloc((size/4+1)*4);
if (NULL == buffer1)
{
printf("memory_error");
exit(2);
}
ret1 = base64_encode(buffer, buffer1, size);
length = strlen(buffer1);
printf("%s\n", buffer1);
free(buffer);
free(buffer1);
return 0;
}
```
注：将程序中的tc2.jpg换成你需要编码的图片的路径就可以用了，也提供了解码函数可以调用。
最近在做图片上传，觉得这段base64编解码的代码很有用，分享给大家！
原帖地址：C语言对图片进行base64编码 谢谢楼主啊 厉害，学习了 感谢分享，厉害了，楼主
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