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WISE Receive Number

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(Maemo Platform)
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== Maemo Platform ==
 
== Maemo Platform ==
 +
<code>
 +
#define LITTLE_ENDIAN 'L'
 +
#define BIG_ENDIAN 'R'
  
 +
int buffer_to_int(const char* buffer,int* error)
 +
{
 +
    int index,result=0;
 +
    *error=WISE_OK;
 +
    if ( buffer==NULL ) return 0;
 +
    if ( buffer[0]==LITTLE_ENDIAN )
 +
    {
 +
        for ( index=sizeof(int); index>1; index-- )
 +
            result=(result+(int)buffer[index])<<8;       
 +
        result+=(int)buffer[1];
 +
    }
 +
    else if ( buffer[0]==BIG_ENDIAN )
 +
    {
 +
        for ( index=1; index < sizeof(int); index++ )
 +
            result=(result+(int)buffer[index])<<8;       
 +
        result+=(int)buffer[sizeof(int)];
 +
    }
 +
    else *error=WISE_ERROR;
 +
    return result;
 +
}
 +
 +
int wise_recv_int(int socket,int* nbr)
 +
{
 +
    int bytes_read=0,error;
 +
    char number[sizeof(int)+1];
 +
   
 +
    /* receive number */
 +
    bytes_read = read(socket,number,sizeof(int)+1);
 +
    if ( bytes_read < sizeof(int)+1 )
 +
    {
 +
        return WISE_CONNECTION_ERROR;
 +
    }
 +
    *nbr = buffer_to_int(number,&error);
 +
    return error;
 +
}
 +
</code>
  
 
== S60 Platform ==
 
== S60 Platform ==

Revision as of 13:12, 17 June 2008

Contents

Description

The communication between two WISE devices is devided into two possibilities

When number is send or received the data size is always 5 bytes - the first byte is a control byte (always 'L') and the remaining 4 bytes represents a 32 bit integer is a little endian format.

Maemo Platform

#define LITTLE_ENDIAN 'L'
#define BIG_ENDIAN 'R'
 
int buffer_to_int(const char* buffer,int* error)
{
int index,result=0;
*error=WISE_OK;
if ( buffer==NULL ) return 0;
if ( buffer[0]==LITTLE_ENDIAN )
{
for ( index=sizeof(int); index>1; index-- )
result=(result+(int)buffer[index])<<8;
result+=(int)buffer[1];
}
else if ( buffer[0]==BIG_ENDIAN )
{
for ( index=1; index < sizeof(int); index++ )
result=(result+(int)buffer[index])<<8;
result+=(int)buffer[sizeof(int)];
}
else *error=WISE_ERROR;
return result;
}
 
int wise_recv_int(int socket,int* nbr)
{
int bytes_read=0,error;
char number[sizeof(int)+1];
 
/* receive number */
bytes_read = read(socket,number,sizeof(int)+1);
if ( bytes_read < sizeof(int)+1 )
{
return WISE_CONNECTION_ERROR;
}
*nbr = buffer_to_int(number,&error);
return error;
}

S60 Platform

Links

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