#include <assert.h>
#include <sys/time.h>
#include <linux/capi.h>
#include <capi20.h>

#include "id.h"
#include "init.h"
#include "data.h"

MainDataAvailable_t MainDataAvailable_p = 0L;
MainDataConf_t MainDataConf_p = 0L;

/*
 * SendData: Sends one block with data over the specified channel
 */
unsigned SendData(ConnectionID Connection, void *Data, unsigned short DataLength, unsigned short DataHandle) {
	_cmsg   CMSG;

	assert (Connection != INVALID_CONNECTION_ID);
	assert (GetState(Connection) == Connected);

	DATA_B3_REQ_HEADER(&CMSG, Appl_Id, 0, GetConnectionNCCI(Connection));
	DATA_B3_REQ_DATA(&CMSG) = (unsigned long)Data;
	DATA_B3_REQ_DATALENGTH(&CMSG) = DataLength;
	DATA_B3_REQ_DATAHANDLE(&CMSG) = DataHandle;
	return CAPI_PUT_CMSG(&CMSG);
}

/*
 * DataConf: signals the successful sending of a datablock
 * This function is called after receiving a DATA_B3_CONFirmation. CAPI signals
 * that the datablock identified by DataHandle has been sent and the memory
 * area may be freed. The DataHandle is the same as specified in SendBlock.
 * This function is implemented in the main program.
 */
void DataConf(ConnectionID Connection, unsigned short DataHandle, unsigned short Info) {
	if (MainDataConf_p)
		MainDataConf_p(Connection, DataHandle, Info);
}

/*
 * DataAvailable: signals received data blocks
 * This function is called after a DATA_B3_INDication is received. The flag
 * DiscardData tells CAPI to free the memora area directly after the return
 * of this function when set to TRUE (1) which is the preset. When the flag
 * is set to FALSE (0) the data area MUST be freed later with ReleaseData.
 * The datahandle identifies the memory area. When reaching 7 unconfirmed
 * blocks, no more incoming data will be signaled until freeing at least
 * one block.
 * This function is implemented in the main program.
 */
void DataAvailable(ConnectionID Connection, void *Data, unsigned short DataLength,
		   unsigned short DataHandle, int *DiscardData) {
	if (MainDataAvailable_p)
		MainDataAvailable_p(Connection, Data, DataLength, DataHandle,
				    DiscardData);
	else
		*DiscardData = TRUE;
}

/*
 * ReleaseData: allows CAPI to reuse the memory area of the specified block.
 * CAPI allows max. 7 unconfirmed Blocks. If the maximum of 7 is reached,
 * no more DATA_B3_INDications will come up.
 */
unsigned ReleaseData(ConnectionID Connection, unsigned short DataHandle) {
	_cmsg   CMSG;

	assert (Connection != INVALID_CONNECTION_ID);
	assert (GetState(Connection) == Connected);
	return DATA_B3_RESP(&CMSG, Appl_Id, 0, GetConnectionNCCI(Connection), DataHandle);
}