sane-project-backends/backend/epson_scsi.c

#include <sane/sanei_debug.h>
#include <sane/sanei_scsi.h>
#include "epson_scsi.h"

#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef NEED_SYS_TYPES_H
#include <sys/types.h>
#endif

#include <stdio.h>

/*
 * sense handler for the sanei_scsi_XXX comands
 */
SANE_Status 
sanei_epson_scsi_sense_handler(int scsi_fd, u_char *result, void *arg)
{
	/* to get rid of warnings */
	scsi_fd = scsi_fd;
	arg = arg;

	if (result[0] && result[0]!=0x70)
	{
		DBG (2, "sense_handler() : sense code = 0x%02x\n", result[0]);
		return SANE_STATUS_IO_ERROR;
	}
	else
	{
		return SANE_STATUS_GOOD;
	}
}

/*
 *
 *
 */
SANE_Status 
sanei_epson_scsi_inquiry(int fd, int page_code, void * buf, size_t * buf_size) 
{
	u_char cmd [ 6];
	int status;

	memset( cmd, 0, 6);
	cmd[ 0] = INQUIRY_COMMAND;
	cmd[ 2] = page_code;
	cmd[ 4] = *buf_size > 255 ? 255 : *buf_size;
	status = sanei_scsi_cmd( fd, cmd, sizeof cmd, buf, buf_size);

	return status;
}

/*
 *
 *
 */
int 
sanei_epson_scsi_read(int fd, void * buf, size_t buf_size, SANE_Status * status) 
{
	u_char cmd [ 6];

	memset( cmd, 0, 6);
	cmd[ 0] = READ_6_COMMAND;
	cmd[ 2] = buf_size >> 16;
	cmd[ 3] = buf_size >> 8;
	cmd[ 4] = buf_size;

	if( SANE_STATUS_GOOD == ( *status = sanei_scsi_cmd( fd, cmd, sizeof( cmd), buf, &buf_size)))
		return buf_size;

	return 0;
}

/*
 *
 *
 */
int 
sanei_epson_scsi_write(int fd, const void * buf, size_t buf_size, SANE_Status * status) 
{
	u_char * cmd;

	cmd = alloca( 6 + buf_size);
	memset( cmd, 0, 6);
	cmd[ 0] = WRITE_6_COMMAND;
	cmd[ 2] = buf_size >> 16;
	cmd[ 3] = buf_size >> 8;
	cmd[ 4] = buf_size;
	memcpy( cmd + 6, buf, buf_size);

	if( SANE_STATUS_GOOD == ( *status = sanei_scsi_cmd( fd, cmd, 6 + buf_size, NULL, NULL)))
		return buf_size;

	return 0;
}