sane-project-backends/backend/epson_scsi.c

#ifdef _AIX
#include "../include/lalloca.h"	/* MUST come first for AIX! */
#endif
#include "../include/sane/config.h"
#include <sane/sanei_debug.h>
#include <sane/sanei_scsi.h>
#include "epson_scsi.h"

#include "../include/lalloca.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 <string.h>		/* for memset and memcpy */
#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 (8 + buf_size);
  memset (cmd, 0, 8);
  cmd[0] = WRITE_6_COMMAND;
  cmd[2] = buf_size >> 16;
  cmd[3] = buf_size >> 8;
  cmd[4] = buf_size;
  memcpy (cmd + 8, buf, buf_size);

  if (SANE_STATUS_GOOD ==
      (*status = sanei_scsi_cmd2 (fd, cmd, 6, cmd + 8, buf_size, NULL, NULL)))
    return buf_size;

  return 0;
}