/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Module Info: This module contains the functionality for setting & querying
 *      the datatype byte order for the H5T interface.
 */

/****************/
/* Module Setup */
/****************/

#include "H5Tmodule.h"          /* This source code file is part of the H5T module */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Tpkg.h"		/* Datatypes				*/


/****************/
/* Local Macros */
/****************/


/******************/
/* Local Typedefs */
/******************/


/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/
static herr_t H5T_set_order(H5T_t *dtype, H5T_order_t order);


/*********************/
/* Public Variables */
/*********************/


/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/



/*-------------------------------------------------------------------------
 * Function:	H5Tget_order
 *
 * Purpose:	Returns the byte order of a datatype.
 *
 * Return:	Success:	A byte order constant.  If the type is compound
 *				and its members have mixed orders, this function
 *				returns H5T_ORDER_MIXED.
 *		Failure:	H5T_ORDER_ERROR (Negative)
 *
 * Programmer:	Robb Matzke
 *		Wednesday, January  7, 1998
 * 
 *-------------------------------------------------------------------------
 */
H5T_order_t
H5Tget_order(hid_t type_id)
{
    H5T_t		*dt;            /* Datatype to query */
    H5T_order_t		ret_value;      /* Return value */

    FUNC_ENTER_API(H5T_ORDER_ERROR)
    H5TRACE1("To", "i", type_id);

    /* Check args */
    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
	HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, H5T_ORDER_ERROR, "not a datatype")

    /* Get order */
    if(H5T_ORDER_ERROR == (ret_value = H5T_get_order(dt)))
	HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, H5T_ORDER_ERROR, "cant't get order for specified datatype")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Tget_order() */


/*-------------------------------------------------------------------------
 * Function:	H5T_get_order
 *
 * Purpose:	Returns the byte order of a datatype.
 *
 * Return:	Success:	A byte order constant
 *		Failure:	H5T_ORDER_ERROR (Negative)
 *
 * Programmer:	Quincey Koziol
 *		Wednesday, October 17, 2007
 *
 *-------------------------------------------------------------------------
 */
H5T_order_t
H5T_get_order(const H5T_t *dtype)
{
    H5T_order_t	ret_value = H5T_ORDER_NONE;      /* Return value */

    FUNC_ENTER_NOAPI(H5T_ORDER_ERROR)

    /* Defer to parent */
    while(dtype->shared->parent)
        dtype = dtype->shared->parent;

    /* Set order for atomic type. */
    if(H5T_IS_ATOMIC(dtype->shared))
        ret_value = dtype->shared->u.atomic.order;
    else {
        /* Check for compound datatype */
        if(H5T_COMPOUND == dtype->shared->type) {
            H5T_order_t memb_order = H5T_ORDER_NONE;
            int nmemb;          /* Number of members in compound & enum types */
            int i;              /* Local index variable */

            /* Retrieve the number of members */
            if((nmemb = H5T_get_nmembers(dtype)) < 0)
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_ORDER_ERROR, "can't get number of members from compound data type")

            /* Get order for each compound member type. */
            for(i = 0; i < nmemb; i++) {
                /* Get order for member */
                if((memb_order = H5T_get_order(dtype->shared->u.compnd.memb[i].type)) == H5T_ORDER_ERROR)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, H5T_ORDER_ERROR, "can't get order for compound member")

                /* Ignore the H5T_ORDER_NONE, write down the first non H5T_ORDER_NONE order. */
                if(memb_order != H5T_ORDER_NONE && ret_value == H5T_ORDER_NONE)
                    ret_value = memb_order;

                /* If the orders are mixed, stop the loop and report it.  
                 * (H5T_ORDER_NONE is ignored)
                 */
                if(memb_order != H5T_ORDER_NONE && ret_value != H5T_ORDER_NONE
                        && memb_order != ret_value) {
                    ret_value = H5T_ORDER_MIXED;
                    break;
                } /* end if */
            } /* end for */
        } /* end if */
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_get_order() */


/*-------------------------------------------------------------------------
 * Function:	H5Tset_order
 *
 * Purpose:	Sets the byte order for a datatype.
 *
 * Notes:	There are some restrictions on this operation:
 *		1. For enum type, members shouldn't be defined yet.
 *		2. H5T_ORDER_NONE only works for reference and fixed-length
 *			string.
 *		3. For opaque type, the order will be ignored.
 *		4. For compound type, all restrictions above apply to the 
 *			members.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Wednesday, January  7, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_order(hid_t type_id, H5T_order_t order)
{
    H5T_t	*dt;                    /* Datatype to modify */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "iTo", type_id, order);

    /* Check args */
    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
	HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
    if(order < H5T_ORDER_LE || order > H5T_ORDER_NONE || order == H5T_ORDER_MIXED)
	HGOTO_ERROR(H5E_DATATYPE, H5E_BADVALUE, FAIL, "illegal byte order")
    if(H5T_STATE_TRANSIENT != dt->shared->state)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype is read-only")

    /* Call internal routine to set the order */
    if(H5T_set_order(dt, order) < 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "can't set order")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Tset_order() */


/*-------------------------------------------------------------------------
 * Function:	H5T_set_order
 *
 * Purpose:	Private function to set the byte order for a datatype.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		13 August 2010
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_set_order(H5T_t *dtype, H5T_order_t order)
{
    herr_t      ret_value = SUCCEED;  /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if(H5T_ENUM == dtype->shared->type && dtype->shared->u.enumer.nmembs > 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "operation not allowed after enum members are defined")

    /* For derived data type, defer to parent */ 
    while(dtype->shared->parent)
        dtype = dtype->shared->parent;

    /* Check for setting order on inappropriate datatype */
    if(order == H5T_ORDER_NONE && !(H5T_REFERENCE == dtype->shared->type || 
            H5T_OPAQUE == dtype->shared->type || H5T_IS_FIXED_STRING(dtype->shared)))
	HGOTO_ERROR(H5E_DATATYPE, H5E_BADVALUE, FAIL, "illegal byte order for type")

    /* For atomic data type */
    if(H5T_IS_ATOMIC(dtype->shared))
        dtype->shared->u.atomic.order = order;
    else {
        /* Check for compound datatype */
        if(H5T_COMPOUND == dtype->shared->type) {
            int nmemb;          /* Number of members in type */
            int i;              /* Local index variable */

            /* Retrieve the number of fields in the compound datatype */
            if((nmemb = H5T_get_nmembers(dtype)) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't get number of members from compound data type")

            /* Check for uninitialized compound datatype */
            if(nmemb == 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNINITIALIZED, FAIL, "no member is in the compound data type")

            /* Loop through all fields of compound type, setting the order */
            for(i = 0; i < nmemb; i++)
                if(H5T_set_order(dtype->shared->u.compnd.memb[i].type, order) < 0)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "can't set order for compound member")
        } /* end if */
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_set_order() */

