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


/* Programmer:  Quincey Koziol <koziol@hdfgroup.org>
 *              Thursday, March  1, 2007
 *
 * Purpose:	A message holding driver info settings
 *              in the superblock extension.
 */

#include "H5Omodule.h"          /* This source code file is part of the H5O module */


#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Opkg.h"             /* Object headers			*/
#include "H5MMprivate.h"	/* Memory management			*/

static void  *H5O_drvinfo_decode(H5F_t *f, H5O_t *open_oh, unsigned mesg_flags,
    unsigned *ioflags, size_t p_size, const uint8_t *p);
static herr_t H5O_drvinfo_encode(H5F_t *f, hbool_t disable_shared, uint8_t *p, const void *_mesg);
static void  *H5O_drvinfo_copy(const void *_mesg, void *_dest);
static size_t H5O_drvinfo_size(const H5F_t *f, hbool_t disable_shared, const void *_mesg);
static herr_t H5O__drvinfo_reset(void *_mesg);
static herr_t H5O__drvinfo_debug(H5F_t *f, const void *_mesg, FILE *stream,
    int indent, int fwidth);

/* This message derives from H5O message class */
const H5O_msg_class_t H5O_MSG_DRVINFO[1] = {{
    H5O_DRVINFO_ID,             /*message id number                     */
    "driver info",		/*message name for debugging            */
    sizeof(H5O_drvinfo_t),	/*native message size                   */
    0,				/* messages are sharable?       */
    H5O_drvinfo_decode,		/*decode message                        */
    H5O_drvinfo_encode,		/*encode message                        */
    H5O_drvinfo_copy,           /*copy the native value                 */
    H5O_drvinfo_size,		/*raw message size			*/
    H5O__drvinfo_reset,         /*free internal memory			*/
    NULL,                       /* free method				*/
    NULL,			/* file delete method			*/
    NULL,			/* link method				*/
    NULL,			/*set share method		*/
    NULL,		    	/*can share method		        */
    NULL,			/* 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__drvinfo_debug           /*debug the message			*/
}};

/* Current version of driver info information */
#define H5O_DRVINFO_VERSION 	0


/*-------------------------------------------------------------------------
 * Function:	H5O_drvinfo_decode
 *
 * Purpose:	Decode a shared message table message and return a pointer
 *              to a newly allocated H5O_drvinfo_t struct.
 *
 * Return:	Success:	Ptr to new message in native struct.
 *		Failure:	NULL
 *
 * Programmer:  Quincey Koziol
 *              Mar  1, 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_drvinfo_decode(H5F_t H5_ATTR_UNUSED *f, H5O_t H5_ATTR_UNUSED *open_oh,
    unsigned H5_ATTR_UNUSED mesg_flags, unsigned H5_ATTR_UNUSED *ioflags,
    size_t H5_ATTR_UNUSED p_size, const uint8_t *p)
{
    H5O_drvinfo_t	*mesg;          /* Native message */
    void		*ret_value = NULL;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

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

    /* Version of message */
    if(*p++ != H5O_DRVINFO_VERSION)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for message")

    /* Allocate space for message */
    if(NULL == (mesg = (H5O_drvinfo_t *)H5MM_calloc(sizeof(H5O_drvinfo_t))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for driver info message")

    /* Retrieve driver name */
    HDmemcpy(mesg->name, p, 8);
    mesg->name[8] = '\0';
    p += 8;

    /* Decode buffer size */
    UINT16DECODE(p, mesg->len);
    HDassert(mesg->len);

    /* Allocate space for buffer */
    if(NULL == (mesg->buf = (uint8_t *)H5MM_malloc(mesg->len))) {
        mesg = (H5O_drvinfo_t *)H5MM_xfree(mesg);
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for driver info buffer")
    } /* end if */

    /* Copy encoded driver info into buffer */
    HDmemcpy(mesg->buf, p, mesg->len);

    /* Set return value */
    ret_value = (void *)mesg;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_drvinfo_decode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_drvinfo_encode
 *
 * Purpose:	Encode a v1 B-tree 'K' value message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              Mar  1, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_drvinfo_encode(H5F_t H5_ATTR_UNUSED *f, hbool_t H5_ATTR_UNUSED disable_shared, uint8_t *p, const void *_mesg)
{
    const H5O_drvinfo_t *mesg = (const H5O_drvinfo_t *)_mesg;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    HDassert(f);
    HDassert(p);
    HDassert(mesg);

    /* Store version, driver name, buffer length, & encoded buffer */
    *p++ = H5O_DRVINFO_VERSION;
    HDmemcpy(p, mesg->name, 8);
    p += 8;
    HDassert(mesg->len <= 65535);
    UINT16ENCODE(p, mesg->len);
    HDmemcpy(p, mesg->buf, mesg->len);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_drvinfo_encode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_drvinfo_copy
 *
 * Purpose:	Copies a message from _MESG to _DEST, allocating _DEST if
 *		necessary.
 *
 * Return:	Success:	Ptr to _DEST
 *		Failure:	NULL
 *
 * Programmer:  Quincey Koziol
 *              Mar  1, 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_drvinfo_copy(const void *_mesg, void *_dest)
{
    const H5O_drvinfo_t	*mesg = (const H5O_drvinfo_t *)_mesg;
    H5O_drvinfo_t	*dest = (H5O_drvinfo_t *)_dest;
    void		*ret_value = NULL;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity check */
    HDassert(mesg);

    if(!dest && NULL == (dest = (H5O_drvinfo_t *)H5MM_malloc(sizeof(H5O_drvinfo_t))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for shared message table message")

    /* Shallow copy the fields */
    *dest = *mesg;

    /* Copy the buffer */
    if(NULL == (dest->buf = (uint8_t *)H5MM_malloc(mesg->len))) {
        if(dest != _dest)
            dest = (H5O_drvinfo_t *)H5MM_xfree(dest);
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
    } /* end if */
    HDmemcpy(dest->buf, mesg->buf, mesg->len);

    /* Set return value */
    ret_value = dest;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_drvinfo_copy() */


/*-------------------------------------------------------------------------
 * Function:	H5O_drvinfo_size
 *
 * Purpose:	Returns the size of the raw message in bytes not counting the
 *		message type or size fields, but only the data fields.
 *
 * Return:	Success:	Message data size in bytes w/o alignment.
 *		Failure:	0
 *
 * Programmer:  Quincey Koziol
 *              Mar  1, 2007
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5O_drvinfo_size(const H5F_t H5_ATTR_UNUSED *f, hbool_t H5_ATTR_UNUSED disable_shared, const void *_mesg)
{
    const H5O_drvinfo_t *mesg = (const H5O_drvinfo_t *)_mesg;
    size_t ret_value = 0;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    HDassert(f);
    HDassert(mesg);

    ret_value = 1 +             /* Version number */
		8 +             /* Driver name */
		2 +             /* Buffer length */
		mesg->len;      /* Buffer */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_drvinfo_size() */


/*-------------------------------------------------------------------------
 * Function:    H5O__drvinfo_reset
 *
 * Purpose:     Frees internal pointers and resets the message to an
 *              initial state.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar  1 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O__drvinfo_reset(void *_mesg)
{
    H5O_drvinfo_t *mesg = (H5O_drvinfo_t *) _mesg;

    FUNC_ENTER_STATIC_NOERR

    /* check args */
    HDassert(mesg);

    /* reset */
    mesg->buf = (uint8_t *)H5MM_xfree(mesg->buf);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O__drvinfo_reset() */


/*-------------------------------------------------------------------------
 * Function:	H5O__drvinfo_debug
 *
 * Purpose:	Prints debugging info for the message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              Mar  1, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O__drvinfo_debug(H5F_t H5_ATTR_UNUSED *f, const void *_mesg, FILE *stream,
    int indent, int fwidth)
{
    const H5O_drvinfo_t *mesg = (const H5O_drvinfo_t *)_mesg;

    FUNC_ENTER_STATIC_NOERR

    /* Sanity check */
    HDassert(f);
    HDassert(mesg);
    HDassert(stream);
    HDassert(indent >= 0);
    HDassert(fwidth >= 0);

    HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
	      "Driver name:", mesg->name);
    HDfprintf(stream, "%*s%-*s %Zu\n", indent, "", fwidth,
	      "Buffer size:", mesg->len);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O__drvinfo_debug() */


