/*----------------------------------------------------------
I2CPort.readArray
accept: offset (offset to start storing data in the jbarray) and
Length (bytes to read)
perform: read bytes from the port into a byte array
return: bytes read on success
0 on read timeout
exceptions: IOException
comments: throws ArrayIndexOutOfBoundsException if asked to
read more than SSIZE_MAX bytes
----------------------------------------------------------*/
JNIEXPORT jint JNICALL Java_gnu_io_I2CPort_readArray( JNIEnv *env,
jobject jobj, jbyteArray jbarray, jint offset, jint length )
{
int bytes;
jbyte *body;
unsigned char *buffer;
int fd = get_java_var( env, jobj, "fd", "I" );
int timeout = get_java_var( env, jobj, "timeout", "I" );
if( (size_t) length > SSIZE_MAX || length < 0 ) {
throw_java_exception( env, ARRAY_INDEX_OUT_OF_BOUNDS,
"readArray", "Invalid length" );
return -1;
}
buffer = (unsigned char *)malloc( sizeof( unsigned char ) * length );
if( buffer == 0 ) {
throw_java_exception( env, OUT_OF_MEMORY, "readArray",
"Unable to allocate buffer" );
return -1;
}
bytes = read_byte_array( fd, buffer, length, timeout );
if( bytes < 0 ) {
free( buffer );
throw_java_exception( env, IO_EXCEPTION, "readArray",
strerror( errno ) );
return -1;
}
body = (*env)->GetByteArrayElements( env, jbarray, 0 );
memcpy(body + offset, buffer, bytes);
(*env)->ReleaseByteArrayElements( env, jbarray, body, 0 );
free( buffer );
return (bytes ? bytes : -1);
}
/*----------------------------------------------------------
RS485Port.readByte
accept: none
perform: Read a single byte from the port
return: The byte read
exceptions: IOException
----------------------------------------------------------*/
JNIEXPORT jint JNICALL Java_gnu_io_RS485Port_readByte(JNIEnv *env, jobject jobj) {
int bytes;
unsigned char buffer[1];
int fd = get_java_var(env, jobj, "fd", "I");
int timeout = get_java_var(env, jobj, "timeout", "I");
bytes = read_byte_array(fd, buffer, 1, timeout);
if (bytes < 0) {
throw_java_exception(env, IO_EXCEPTION, "readByte", strerror( errno));
return -1;
}
return (bytes ? (jint) buffer[0] : -1);
}
/*----------------------------------------------------------
LPRPort.readByte
accept: none
perform: Read a single byte from the port
return: The byte read
exceptions: IOException
----------------------------------------------------------*/
JNIEXPORT jint JNICALL LPRPort(readByte)( JNIEnv *env,
jobject jobj )
{
int bytes, fd, timeout;
unsigned char buffer[ 1 ];
fd = get_java_var( env, jobj,"fd","I" );
timeout = get_java_var( env, jobj, "timeout","I");
bytes = read_byte_array( fd, buffer, 1, 1, timeout );
if( bytes < 0 )
{
throw_java_exception_system_msg( env, IO_EXCEPTION, "readByte" );
return -1;
}
return (bytes ? (jint)buffer[ 0 ] : -1);
}
/*----------------------------------------------------------
LPRPort.readArray
accept: offset (bytes to skip) and Length (bytes to read)
perform: read bytes from the port into a byte array
return: bytes read on success
0 on read timeout
exceptions: IOException
comments: throws IOException if asked to read > SSIZE_MAX
----------------------------------------------------------*/
JNIEXPORT jint JNICALL LPRPort(readArray)( JNIEnv *env,
jobject jobj, jbyteArray jbarray, jint offset, jint length )
{
int bytes, i, fd, threshold, timeout;
jbyte *body;
unsigned char *buffer;
fd = get_java_var( env, jobj,"fd","I" );
threshold = get_java_var( env, jobj,"threshold","I" );
timeout = get_java_var( env, jobj,"threshold","I" );
if( (size_t) length < 1 || (size_t) length > SSIZE_MAX )
{
throw_java_exception( env, IO_EXCEPTION, "readArray",
"Invalid length" );
return -1;
}
buffer = (unsigned char *)malloc( sizeof( unsigned char ) * length );
if( buffer == 0 )
{
throw_java_exception( env, IO_EXCEPTION, "readArray",
"Unable to allocate buffer" );
return -1;
}
bytes = read_byte_array( fd, buffer, length, threshold, timeout );
if( bytes < 0 )
{
free( buffer );
throw_java_exception_system_msg( env, IO_EXCEPTION, "readArray" );
return -1;
}
body = (*env)->GetByteArrayElements( env, jbarray, 0 );
for( i = 0; i < bytes; i++ ) body[ i + offset ] = buffer[ i ];
(*env)->ReleaseByteArrayElements( env, jbarray, body, 0 );
free( buffer );
return (bytes ? bytes : -1);
}
