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From: Valli on 22 Jan 2010 23:53
Hi,

I am having encode & decode functions in C.
Will receive an encoded value in vb.net( this encoded value is updated in
database by another C process) & this must be decoded using vb.net code.
How can I apply this?

The decode function in C is

/*Decode function to decode the incoming buffer containing encoded data*/
void decode(char *inbuf,int sizeInbuffer,char *outbuf,int *decodeoutbufsize)
{
/*Local Declaration*/
unsigned char in[4], out[3], v;
int i, len,j;
int counter=0;
int a1=0;

for(j=0;j<sizeInbuffer;j=j+4)
{
for( len = 0, i = 0; i < 4; i++ )
{
v = 0;
while(v==0)
{
v=(unsigned char) inbuf[counter++];
v = (unsigned char) ((v < 43 || v > 122) ? 0 : cd64[ v - 43 ]);
if( v )
{
v = (unsigned char) ((v == '$') ? 0 : v - 61);
}
}
len++;
if( v )
{
in[ i ] = (unsigned char) (v - 1);
}
}

if( len )
{
decodeblock( in, out );
memcpy(outbuf+a1,out,3);
// printf("%d",strlen(outbuf));
a1+=3;
}
}

*decodeoutbufsize = a1; //Done at SetDecodedLengthForOrderMsg(). Subtract
by 2 since we have only 439 bytes, Last 1 byte also decoded with more than
one byte(i.e, two bytes).
return;
}



--
Regards
Valli


From: Patrice on 23 Jan 2010 05:26
Hello,

> I am having encode & decode functions in C.
> Will receive an encoded value in vb.net( this encoded value is updated in
> database by another C process) & this must be decoded using vb.net code.
> How can I apply this?

This is base64 encoding which is available from the .NET library :
http://msdn.microsoft.com/en-us/library/system.convert.frombase64string.aspx

--
Patrice

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