/*
* Decode base64 str, outputting data to buffer
* at data of length size. Return length of
* decoded data written or -1 on error or overflow.
*/
int
vpnconnect_base64_decode(const char *str, void *data, int size)
{
const char *p;
unsigned char *q;
unsigned char *e = NULL;
q = data;
if (size >= 0)
e = q + size;
for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
unsigned int val = token_decode(p);
unsigned int marker = (val >> 24) & 0xff;
if (val == DECODE_ERROR)
return -1;
if (e && q >= e)
return -1;
*q++ = (val >> 16) & 0xff;
if (marker < 2)
{
if (e && q >= e)
return -1;
*q++ = (val >> 8) & 0xff;
}
if (marker < 1)
{
if (e && q >= e)
return -1;
*q++ = val & 0xff;
}
}
return q - (unsigned char *) data;
}
// TODO: Implement an S3Data class.
S3_PRIVATE int s3_base64_decode(const char *str, void *data) {
const char *p;
unsigned char *q;
q = data;
for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
unsigned int val = token_decode(p);
unsigned int marker = (val >> 24) & 0xff;
if (val == DECODE_ERROR)
return -1;
*q++ = (val >> 16) & 0xff;
if (marker < 2)
*q++ = (val >> 8) & 0xff;
if (marker < 1)
*q++ = val & 0xff;
}
return q - (unsigned char *) data;
}
int
base64_decode(const char *str, void *data)
{
const char *p;
unsigned char *q;
unsigned int size;
q = data;
size = strlen(str);
for (p = str; *p && (*p == '=' || is_base64_char(*p)); p += 4, size -= 4)
{
unsigned int val = token_decode(p, size);
unsigned int marker = (val >> 24) & 0xff;
if (val == DECODE_ERROR)
return -1;
*q++ = (val >> 16) & 0xff;
if (marker < 2)
*q++ = (val >> 8) & 0xff;
if (marker < 1)
*q++ = val & 0xff;
}
return q - (unsigned char *) data;
}
