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;
}

