path: root/src/H5Orefcount.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:             H5Orefcount.c
 *                      Mar 10 2007
 *                      Quincey Koziol <koziol@hdfgroup.org>
 *
 * Purpose:             Object ref. count messages.
 *
 *-------------------------------------------------------------------------
 */

#define H5O_PACKAGE		/*suppress error about including H5Opkg	  */

#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free lists                           */
#include "H5Opkg.h"             /* Object headers			*/


/* PRIVATE PROTOTYPES */
static void *H5O_refcount_decode(H5F_t *f, hid_t dxpl_id, unsigned mesg_flags, const uint8_t *p);
static herr_t H5O_refcount_encode(H5F_t *f, hbool_t disable_shared, uint8_t *p, const void *_mesg);
static void *H5O_refcount_copy(const void *_mesg, void *_dest);
static size_t H5O_refcount_size(const H5F_t *f, hbool_t disable_shared, const void *_mesg);
static herr_t H5O_refcount_free(void *_mesg);
static herr_t H5O_refcount_pre_copy_file(H5F_t *file_src, const void *mesg_src,
    hbool_t *deleted, const H5O_copy_t *cpy_info, void *udata);
static herr_t H5O_refcount_debug(H5F_t *f, hid_t dxpl_id, const void *_mesg,
			     FILE * stream, int indent, int fwidth);

/* This message derives from H5O message class */
const H5O_msg_class_t H5O_MSG_REFCOUNT[1] = {{
    H5O_REFCOUNT_ID,           	/*message id number             */
    "refcount",                	/*message name for debugging    */
    sizeof(H5O_refcount_t),    	/*native message size           */
    FALSE,			/* messages are sharable?       */
    H5O_refcount_decode,	/*decode message                */
    H5O_refcount_encode,	/*encode message                */
    H5O_refcount_copy,		/*copy the native value         */
    H5O_refcount_size,		/*size of symbol table entry    */
    NULL,                   	/*default reset method          */
    H5O_refcount_free,	        /* free method			*/
    NULL,			/* file delete method		*/
    NULL,			/* link method			*/
    NULL, 			/*set share method		*/
    NULL,		    	/*can share method		*/
    H5O_refcount_pre_copy_file,	/* pre copy native value to file */
    NULL,			/* copy native value to file    */
    NULL,			/* post copy native value to file */
    NULL,			/* get creation index		*/
    NULL,			/* set creation index		*/
    H5O_refcount_debug         	/*debug the message             */
}};

/* Current version of ref. count information */
#define H5O_REFCOUNT_VERSION 	0

/* Declare a free list to manage the H5O_refcount_t struct */
H5FL_DEFINE_STATIC(H5O_refcount_t);


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_decode
 *
 * Purpose:     Decode a message and return a pointer to a newly allocated one.
 *
 * Return:      Success:        Ptr to new message in native form.
 *              Failure:        NULL
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar 10 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_refcount_decode(H5F_t *f, hid_t UNUSED dxpl_id, unsigned UNUSED mesg_flags,
    const uint8_t *p)
{
    H5O_refcount_t *refcount = NULL;  /* Reference count */
    void        *ret_value;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5O_refcount_decode)

    /* check args */
    HDassert(f);
    HDassert(p);

    /* Version of message */
    if(*p++ != H5O_REFCOUNT_VERSION)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for message")

    /* Allocate space for message */
    if(NULL == (refcount = H5FL_MALLOC(H5O_refcount_t)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Get ref. count for object */
    UINT32DECODE(p, *refcount)

    /* Set return value */
    ret_value = refcount;

done:
    if(ret_value == NULL && refcount != NULL)
        H5FL_FREE(H5O_refcount_t, refcount);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_refcount_decode() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_encode
 *
 * Purpose:     Encodes a message.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar 10 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_refcount_encode(H5F_t *f, hbool_t UNUSED disable_shared, uint8_t *p, const void *_mesg)
{
    const H5O_refcount_t   *refcount = (const H5O_refcount_t *)_mesg;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_refcount_encode)

    /* check args */
    HDassert(f);
    HDassert(p);
    HDassert(refcount);

    /* Message version */
    *p++ = H5O_REFCOUNT_VERSION;

    /* Object's ref. count */
    UINT32ENCODE(p, *refcount);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_refcount_encode() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_copy
 *
 * Purpose:     Copies a message from _MESG to _DEST, allocating _DEST if
 *              necessary.
 *
 * Return:      Success:        Ptr to _DEST
 *              Failure:        NULL
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar 10 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_refcount_copy(const void *_mesg, void *_dest)
{
    const H5O_refcount_t   *refcount = (const H5O_refcount_t *)_mesg;
    H5O_refcount_t         *dest = (H5O_refcount_t *) _dest;
    void                *ret_value;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5O_refcount_copy)

    /* check args */
    HDassert(refcount);
    if(!dest && NULL == (dest = H5FL_MALLOC(H5O_refcount_t)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* copy */
    *dest = *refcount;

    /* Set return value */
    ret_value = dest;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_refcount_copy() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_size
 *
 * Purpose:     Returns the size of the raw message in bytes not counting
 *              the message type or size fields, but only the data fields.
 *              This function doesn't take into account alignment.
 *
 * Return:      Success:        Message data size in bytes without alignment.
 *              Failure:        zero
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar 10 2007
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5O_refcount_size(const H5F_t *f, hbool_t UNUSED disable_shared, const void *_mesg)
{
    const H5O_refcount_t   *refcount = (const H5O_refcount_t *)_mesg;
    size_t ret_value;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_refcount_size)

    /* Set return value */
    ret_value = 1                       /* Version */
                + 4;                    /* Ref. count */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_refcount_size() */


/*-------------------------------------------------------------------------
 * Function:	H5O_refcount_free
 *
 * Purpose:	Free's the message
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, March 10, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_refcount_free(void *mesg)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_refcount_free)

    HDassert(mesg);

    H5FL_FREE(H5O_refcount_t, mesg);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_refcount_free() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_pre_copy_file
 *
 * Purpose:     Perform any necessary actions before copying message between
 *              files.
 *
 * Return:      Success:        Non-negative
 *              Failure:        Negative
 *
 * Programmer:  Quincey Koziol
 *              Saturday, March 10, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_refcount_pre_copy_file(H5F_t UNUSED *file_src, const void UNUSED *native_src,
    hbool_t *deleted, const H5O_copy_t *cpy_info, void UNUSED *udata)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_refcount_pre_copy_file)

    /* check args */
    HDassert(deleted);
    HDassert(cpy_info);

    /* Always delete this message when copying objects between files.  Let
     *  the copy routine set the correct ref. count.
     */
    *deleted = TRUE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_refcount_pre_copy_file() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refcount_debug
 *
 * Purpose:     Prints debugging info for a message.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar  6 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_refcount_debug(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_mesg, FILE * stream,
	       int indent, int fwidth)
{
    const H5O_refcount_t       *refcount = (const H5O_refcount_t *) _mesg;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_refcount_debug)

    /* check args */
    HDassert(f);
    HDassert(refcount);
    HDassert(stream);
    HDassert(indent >= 0);
    HDassert(fwidth >= 0);

    HDfprintf(stream, "%*s%-*s %u\n", indent, "", fwidth,
	      "Number of links:", (unsigned)*refcount);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_refcount_debug() */