/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

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

#include "H5Dmodule.h"          /* This source code file is part of the H5D module */
#define H5O_FRIEND		/*suppress error about including H5Opkg	  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5CXprivate.h"        /* API Contexts                         */
#include "H5Dpkg.h"		/* Datasets				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Opkg.h"             /* Object headers			*/


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


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


/********************/
/* Local Prototypes */
/********************/
static void *H5O__dset_get_copy_file_udata(void);
static void H5O__dset_free_copy_file_udata(void *);
static htri_t H5O__dset_isa(const H5O_t *loc);
static hid_t H5O__dset_open(const H5G_loc_t *obj_loc, hbool_t app_ref);
static void *H5O__dset_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc);
static H5O_loc_t *H5O__dset_get_oloc(hid_t obj_id);
static herr_t H5O__dset_bh_info(const H5O_loc_t *loc, H5O_t *oh,
    H5_ih_info_t *bh_info);
static herr_t H5O__dset_flush(void *_obj_ptr);


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


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


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

/* This message derives from H5O object class */
const H5O_obj_class_t H5O_OBJ_DATASET[1] = {{
    H5O_TYPE_DATASET,		/* object type			*/
    "dataset",			/* object name, for debugging	*/
    H5O__dset_get_copy_file_udata, /* get 'copy file' user data	*/
    H5O__dset_free_copy_file_udata, /* free 'copy file' user data	*/
    H5O__dset_isa, 		/* "isa" message		*/
    H5O__dset_open, 		/* open an object of this class */
    H5O__dset_create, 		/* create an object of this class */
    H5O__dset_get_oloc, 	/* get an object header location for an object */
    H5O__dset_bh_info, 		/* get the index & heap info for an object */
    H5O__dset_flush 		/* flush an opened object of this class */
}};

/* Declare a free list to manage the H5D_copy_file_ud_t struct */
H5FL_DEFINE(H5D_copy_file_ud_t);


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_get_copy_file_udata
 *
 * Purpose:	Allocates the user data needed for copying a dataset's
 *		object header from file to file.
 *
 * Return:	Success:	Non-NULL pointer to user data
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, November 21, 2005
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O__dset_get_copy_file_udata(void)
{
    void *ret_value = NULL;     /* Return value */

    FUNC_ENTER_STATIC

    /* Allocate space for the 'copy file' user data for copying datasets */
    if(NULL == (ret_value = H5FL_CALLOC(H5D_copy_file_ud_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_get_copy_file_udata() */


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_free_copy_file_udata
 *
 * Purpose:	Release the user data needed for copying a dataset's
 *		object header from file to file.
 *
 * Return:	<none>
 *
 * Programmer:	Quincey Koziol
 *              Monday, November 21, 2005
 *
 *-------------------------------------------------------------------------
 */
static void
H5O__dset_free_copy_file_udata(void *_udata)
{
    H5D_copy_file_ud_t *udata = (H5D_copy_file_ud_t *)_udata;

    FUNC_ENTER_STATIC_NOERR

    /* Sanity check */
    HDassert(udata);

    /* Release copy of dataset's dataspace extent, if it was set */
    if(udata->src_space_extent)
        H5O_msg_free(H5O_SDSPACE_ID, udata->src_space_extent);

    /* Release copy of dataset's datatype, if it was set */
    if(udata->src_dtype)
        H5T_close_real(udata->src_dtype);

    /* Release copy of dataset's filter pipeline, if it was set */
    if(udata->common.src_pline)
        H5O_msg_free(H5O_PLINE_ID, udata->common.src_pline);

    /* Release space for 'copy file' user data */
    udata = H5FL_FREE(H5D_copy_file_ud_t, udata);

    FUNC_LEAVE_NOAPI_VOID
} /* end H5O__dset_free_copy_file_udata() */


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_isa
 *
 * Purpose:	Determines if an object has the requisite messages for being
 *		a dataset.
 *
 * Return:	Success:	TRUE if the required dataset messages are
 *				present; FALSE otherwise.
 *
 *		Failure:	FAIL if the existence of certain messages
 *				cannot be determined.
 *
 * Programmer:	Robb Matzke
 *              Monday, November  2, 1998
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5O__dset_isa(const H5O_t *oh)
{
    htri_t	exists;                 /* Flag if header message of interest exists */
    htri_t	ret_value = TRUE;       /* Return value */

    FUNC_ENTER_STATIC

    HDassert(oh);

    /* Datatype */
    if((exists = H5O_msg_exists_oh(oh, H5O_DTYPE_ID)) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read object header")
    else if(!exists)
	HGOTO_DONE(FALSE)

    /* Layout */
    if((exists = H5O_msg_exists_oh(oh, H5O_SDSPACE_ID)) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read object header")
    else if(!exists)
	HGOTO_DONE(FALSE)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_isa() */


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_open
 *
 * Purpose:	Open a dataset at a particular location
 *
 * Return:	Success:	Open object identifier
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, November  6, 2006
 *
 *-------------------------------------------------------------------------
 */
static hid_t
H5O__dset_open(const H5G_loc_t *obj_loc, hbool_t app_ref)
{
    H5D_t  *dset = NULL;                /* Dataset opened */
    hid_t   dapl_id;                    /* dapl to use to open this dataset */
    hid_t   ret_value = H5I_INVALID_HID;        /* Return value */

    FUNC_ENTER_STATIC

    HDassert(obj_loc);

    /* Get the LAPL (which is a superclass of DAPLs) from the API context, but
     * if it's the default link access property list or a custom link access
     * property list but not a dataset access property list, use the default
     * dataset access property list instead.  (Since LAPLs don't have the
     * additional properties that DAPLs have)
     */
    dapl_id = H5CX_get_lapl();
    if(dapl_id == H5P_LINK_ACCESS_DEFAULT)
        dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    else {
        htri_t is_lapl, is_dapl;        /* Class of LAPL from API context */

        /* Check class of LAPL from API context */
        if((is_lapl = H5P_isa_class(dapl_id, H5P_LINK_ACCESS)) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, H5I_INVALID_HID, "unable to get LAPL status")
        if((is_dapl = H5P_isa_class(dapl_id, H5P_DATASET_ACCESS)) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, H5I_INVALID_HID, "unable to get DAPL status")

        /* Switch to default DAPL if not an actual DAPL in the API context */
        if(!is_dapl && is_lapl)
            dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    } /* end else */

    /* Open the dataset */
    if(NULL == (dset = H5D_open(obj_loc, dapl_id)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, H5I_INVALID_HID, "unable to open dataset")

    /* Register an ID for the dataset */
    if((ret_value = H5I_register(H5I_DATASET, dset, app_ref)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, H5I_INVALID_HID, "unable to register dataset")

done:
    if(ret_value < 0)
        if(dset && H5D_close(dset) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, H5I_INVALID_HID, "unable to release dataset")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_open() */


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_create
 *
 * Purpose:	Create a dataset in a file
 *
 * Return:	Success:	Pointer to the dataset data structure
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, April 11, 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O__dset_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc)
{
    H5D_obj_create_t *crt_info = (H5D_obj_create_t *)_crt_info; /* Dataset creation parameters */
    H5D_t *dset = NULL;         /* New dataset created */
    void *ret_value = NULL;     /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(crt_info);
    HDassert(obj_loc);

    /* Create the the dataset */
    if(NULL == (dset = H5D__create(f, crt_info->type_id, crt_info->space, crt_info->dcpl_id, crt_info->dapl_id)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")

    /* Set up the new dataset's location */
    if(NULL == (obj_loc->oloc = H5D_oloc(dset)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get object location of dataset")
    if(NULL == (obj_loc->path = H5D_nameof(dset)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get path of dataset")

    /* Set the return value */
    ret_value = dset;

done:
    if(ret_value == NULL)
        if(dset && H5D_close(dset) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, NULL, "unable to release dataset")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_create() */


/*-------------------------------------------------------------------------
 * Function:	H5O__dset_get_oloc
 *
 * Purpose:	Retrieve the object header location for an open object
 *
 * Return:	Success:	Pointer to object header location
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, November  6, 2006
 *
 *-------------------------------------------------------------------------
 */
static H5O_loc_t *
H5O__dset_get_oloc(hid_t obj_id)
{
    H5D_t       *dset;                  /* Dataset opened */
    H5O_loc_t	*ret_value = NULL;      /* Return value */

    FUNC_ENTER_STATIC

    /* Get the dataset */
    if(NULL == (dset = (H5D_t *)H5I_object(obj_id)))
        HGOTO_ERROR(H5E_OHDR, H5E_BADATOM, NULL, "couldn't get object from ID")

    /* Get the dataset's object header location */
    if(NULL == (ret_value = H5D_oloc(dset)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "unable to get object location from object")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_get_oloc() */


/*-------------------------------------------------------------------------
 * Function:    H5O__dset_bh_info
 *
 * Purpose:     Returns the amount of btree storage that is used for chunked
 *              dataset.
 *
 * Return:      Success:        non-negative
 *              Failure:        negative
 *
 * Programmer:  Vailin Choi
 *              July 11, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O__dset_bh_info(const H5O_loc_t *loc, H5O_t *oh, H5_ih_info_t *bh_info)
{
    H5O_layout_t        layout;         	/* Data storage layout message */
    H5O_efl_t           efl;			/* External File List message */
    hbool_t             layout_read = FALSE;    /* Whether the layout message was read */
    hbool_t             efl_read = FALSE;       /* Whether the external file list message was read */
    htri_t		exists;                 /* Flag if header message of interest exists */
    herr_t      	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity check */
    HDassert(loc);
    HDassert(loc->file);
    HDassert(H5F_addr_defined(loc->addr));
    HDassert(oh);
    HDassert(bh_info);

    /* Get the layout message from the object header */
    if(NULL == H5O_msg_read_oh(loc->file, oh, H5O_LAYOUT_ID, &layout))
	HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't find layout message")
    layout_read = TRUE;

    /* Check for chunked dataset storage */
    if(layout.type == H5D_CHUNKED && H5D__chunk_is_space_alloc(&layout.storage)) {
        /* Get size of chunk index */
        if(H5D__chunk_bh_info(loc, oh, &layout, &(bh_info->index_size)) < 0)
            HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't determine chunked dataset btree info")
    } /* end if */
    else if(layout.type == H5D_VIRTUAL
            && (layout.storage.u.virt.serial_list_hobjid.addr != HADDR_UNDEF)) {
        size_t virtual_heap_size;

        /* Get size of global heap object for virtual dataset */
        if(H5HG_get_obj_size(loc->file, &(layout.storage.u.virt.serial_list_hobjid), &virtual_heap_size) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get global heap size for virtual dataset mapping")

        /* Return heap size */
        bh_info->heap_size = (hsize_t)virtual_heap_size;
    } /* end if */

    /* Check for External File List message in the object header */
    if((exists = H5O_msg_exists_oh(oh, H5O_EFL_ID)) < 0)
	HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "unable to check for EFL message")

    if(exists && H5D__efl_is_space_alloc(&layout.storage)) {
        /* Start with clean EFL info */
        HDmemset(&efl, 0, sizeof(efl));

	/* Get External File List message from the object header */
	if(NULL == H5O_msg_read_oh(loc->file, oh, H5O_EFL_ID, &efl))
	    HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't find EFL message")
        efl_read = TRUE;

	/* Get size of local heap for EFL message's file list */
	if(H5D__efl_bh_info(loc->file, &efl, &(bh_info->heap_size)) < 0)
            HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't determine EFL heap info")
    } /* end if */

done:
    /* Free messages, if they've been read in */
    if(layout_read && H5O_msg_reset(H5O_LAYOUT_ID, &layout) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTRESET, FAIL, "unable to reset data storage layout message")
    if(efl_read && H5O_msg_reset(H5O_EFL_ID, &efl) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTRESET, FAIL, "unable to reset external file list message")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_bh_info() */


/*-------------------------------------------------------------------------
 * Function:    H5O__dset_flush
 *
 * Purpose:     To flush any dataset information cached in memory
 *
 * Return:      Success:        non-negative
 *              Failure:        negative
 *
 * Programmer:  Vailin Choi
 *              February 2012
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O__dset_flush(void *_obj_ptr)
{
    H5D_t *dset = (H5D_t *)_obj_ptr;	/* Pointer to dataset object */
    H5O_type_t obj_type;              	/* Type of object at location */
    herr_t ret_value = SUCCEED;   	/* Return value */

    FUNC_ENTER_STATIC

    HDassert(dset);
    HDassert(&dset->oloc);

    /* Check that the object found is the correct type */
    if(H5O_obj_type(&dset->oloc, &obj_type) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get object type")
    if(obj_type != H5O_TYPE_DATASET)
        HGOTO_ERROR(H5E_DATASET, H5E_BADTYPE, FAIL, "not a dataset")

    if(H5D__flush_real(dset) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to flush cached dataset info")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dset_flush() */

