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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <Eina.h>
#include "Emile.h"
#include <ctype.h>
/*============================================================================*
* Local *
*============================================================================*/
/**
* @cond LOCAL
*/
static const char *base64_table_normal = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ;
static const char *base64_table_url = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_" ;
static inline Eina_Bool is_base64_char(unsigned char c, Eina_Bool is_base64url)
{
if (is_base64url)
return (isalnum(c) || (c == '-') || (c == '_'));
else
return (isalnum(c) || (c == '+') || (c == '/'));
}
static Eina_Strbuf *
emile_base64_encode_common(const Eina_Binbuf *in, Eina_Bool is_base64url_encode)
{
unsigned char inarr[3], outarr[4];
const unsigned char *src;
size_t len;
char *dest;
int i = 0, j = 0, k = 0;
const char *base64_table;
if (!in) return NULL;
src = eina_binbuf_string_get(in);
len = eina_binbuf_length_get(in);
if (!src) return NULL;
// Max length of encoded string.
dest = malloc(sizeof (char) * (((len + 2) / 3) * 4 + 1));
if (!dest) return NULL;
if (is_base64url_encode)
base64_table = base64_table_url;
else
base64_table = base64_table_normal;
while (len--)
{
inarr[i++] = *(src++);
if (i == 3)
{
outarr[0] = (inarr[0] & 0xfc) >> 2;
outarr[1] = ((inarr[0] & 0x03) << 4) + ((inarr[1] & 0xf0) >> 4);
outarr[2] = ((inarr[1] & 0x0f) << 2) + ((inarr[2] & 0xc0) >> 6);
outarr[3] = inarr[2] & 0x3f;
for(i = 0; (i <4) ; i++)
dest[k++] = base64_table[outarr[i]];
i = 0;
}
}
if (i)
{
for(j = i; j < 3; j++)
inarr[j] = '\0';
outarr[0] = (inarr[0] & 0xfc) >> 2;
outarr[1] = ((inarr[0] & 0x03) << 4) + ((inarr[1] & 0xf0) >> 4);
outarr[2] = ((inarr[1] & 0x0f) << 2) + ((inarr[2] & 0xc0) >> 6);
outarr[3] = inarr[2] & 0x3f;
for (j = 0; (j < i + 1); j++)
dest[k++] = base64_table[outarr[j]];
/* No padding for URL encoding */
while((i++ < 3) && (!is_base64url_encode)) {
dest[k++] = '=';
}
}
dest[k] = '\0';
return eina_strbuf_manage_new(dest);
}
static Eina_Binbuf *
emile_base64_decode_common(const Eina_Strbuf *in, Eina_Bool is_base64url_decode)
{
unsigned char inarr[4], outarr[3];
int i = 0, j = 0, k = 0, l = 0;
int len;
unsigned char *dest;
const char *src;
const char *base64_table;
if (!in) return NULL;
src = eina_strbuf_string_get(in);
len = eina_strbuf_length_get(in);
if (!src) return NULL;
/* The encoded string length should be a multiple of 4. Else it is not a
* valid encoded string.
*/
if (!is_base64url_decode && (len % 4))
return NULL;
/* This is the max size the destination string can have.
*/
dest = (unsigned char *)malloc(sizeof(unsigned char) * ((len * 3 / 4) + 1));
if (!dest)
return NULL;
if (is_base64url_decode)
base64_table = base64_table_url;
else
base64_table = base64_table_normal;
while (len-- && (src[k] != '=') && is_base64_char(src[k], is_base64url_decode))
{
inarr[i++] = src[k++];
if (i == 4)
{
for (i = 0; i <4; i++)
inarr[i] = strchr(base64_table,(int) inarr[i]) - base64_table;
outarr[0] = (inarr[0] << 2) + ((inarr[1] & 0x30) >> 4);
outarr[1] = ((inarr[1] & 0xf) << 4) + ((inarr[2] & 0x3c) >> 2);
outarr[2] = ((inarr[2] & 0x3) << 6) + inarr[3];
for (i = 0; (i < 3); i++)
dest[l++] = outarr[i];
i = 0;
}
}
if (i)
{
for (j = i; j <4; j++)
inarr[j] = 0;
for (j = 0; j <4; j++)
inarr[j] = strchr(base64_table, (int) inarr[j]) - base64_table;
outarr[0] = (inarr[0] << 2) + ((inarr[1] & 0x30) >> 4);
outarr[1] = ((inarr[1] & 0xf) << 4) + ((inarr[2] & 0x3c) >> 2);
outarr[2] = ((inarr[2] & 0x3) << 6) + inarr[3];
for (j = 0; (j < i - 1); j++)
dest[l++] = outarr[j];
}
/* This is to prevent the applications from crashing. */
dest[l] = '\0';
return eina_binbuf_manage_new(dest, l, EINA_FALSE);
}
/**
* @endcond
*/
/*============================================================================*
* Global *
*============================================================================*/
/*============================================================================*
* API *
*============================================================================*/
EMILE_API Eina_Strbuf *
emile_base64_encode(const Eina_Binbuf *in)
{
return emile_base64_encode_common(in, EINA_FALSE);
}
EMILE_API Eina_Strbuf *
emile_base64url_encode(const Eina_Binbuf *in)
{
return emile_base64_encode_common(in, EINA_TRUE);
}
EMILE_API Eina_Binbuf *
emile_base64_decode(const Eina_Strbuf *in)
{
return emile_base64_decode_common(in, EINA_FALSE);
}
EMILE_API Eina_Binbuf *
emile_base64url_decode(const Eina_Strbuf *in)
{
return emile_base64_decode_common(in, EINA_TRUE);
}
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