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base64.h
#ifndef __BASE64_H__
#define __BASE64_H__
#ifdef __cplusplus
extern "C" {
#endif
char * base64_encode(const unsigned char * bindata, char * base64, int binlength);
int base64_decode(const char * base64, unsigned char * bindata);
char *Base64Encode(unsigned char *in, int inLen);
unsigned char *Base64Decode(char *in, int *outLen);
#ifdef __cplusplus
}
#endif
#endif
base64.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//const char * base64char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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 base64;
}
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;
}
//URL BASE 64
char *Base64Encode(unsigned char *in, int inLen)
{
int blen = (inLen / 3 + 1) * 4 + 1;
char *out = (char *)malloc(blen);
memset(out, 0x00, blen);
base64_encode((unsigned char *)in, out, inLen);
return out;
}
unsigned char *Base64Decode(char *in,int *outLen)
{
int xLen = 0;
int inLen = strlen(in);
if (inLen == 0){ return NULL; }
if (in[inLen - 1] != '='){
xLen = inLen / 4 * 3;
}else{
xLen = inLen * 6 / 8;
}
unsigned char *out = (unsigned char *)malloc(xLen+1);
memset(out, 0x00, xLen+1);
int len = base64_decode(in, out);
*outLen = len;
return out;
}