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/*
* Copyright (C) 1998-2001 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Wednesday, April 1, 1998
*
* Purpose: Functions that operate on a shared message. The shared
* message doesn't ever actually appear in the object header as
* a normal message. Instead, if a message is shared, the
* H5O_FLAG_SHARED bit is set and the message body is that
* defined here for H5O_SHARED. The message ID is the ID of the
* pointed-to message and the pointed-to message is stored in
* the global heap.
*/
#include "H5private.h"
#include "H5Eprivate.h"
#include "H5MMprivate.h"
#include "H5Oprivate.h"
static void *H5O_shared_decode (H5F_t*, const uint8_t*, H5O_shared_t *sh);
static herr_t H5O_shared_encode (H5F_t*, uint8_t*, const void*);
static size_t H5O_shared_size (H5F_t*, const void*);
static herr_t H5O_shared_debug (H5F_t*, const void*, FILE*, int, int);
/* This message derives from H5O */
const H5O_class_t H5O_SHARED[1] = {{
H5O_SHARED_ID, /*message id number */
"shared", /*message name for debugging */
sizeof(H5O_shared_t), /*native message size */
H5O_shared_decode, /*decode method */
H5O_shared_encode, /*encode method */
NULL, /*no copy method */
H5O_shared_size, /*size method */
NULL, /*no reset method */
NULL, /*no free method */
NULL, /*get share method */
NULL, /*set share method */
H5O_shared_debug, /*debug method */
}};
#define H5O_SHARED_VERSION 1
/* Interface initialization */
#define PABLO_MASK H5O_shared_mask
static int interface_initialize_g = 0;
#define INTERFACE_INIT NULL
/*-------------------------------------------------------------------------
* Function: H5O_shared_decode
*
* Purpose: Decodes a shared object message and returns it.
*
* Return: Success: Ptr to a new shared object message.
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Thursday, April 2, 1998
*
* Modifications:
* Robb Matzke, 1998-07-20
* Added a version number to the beginning of the message.
*-------------------------------------------------------------------------
*/
static void *
H5O_shared_decode (H5F_t *f, const uint8_t *buf, H5O_shared_t UNUSED *sh)
{
H5O_shared_t *mesg=NULL;
unsigned flags, version;
void *ret_value; /* Return value */
FUNC_ENTER_NOAPI(H5O_shared_decode, NULL);
/* Check args */
assert (f);
assert (buf);
assert (!sh);
/* Decode */
if (NULL==(mesg = H5MM_calloc (sizeof *mesg)))
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
/* Version */
version = *buf++;
if (version!=H5O_SHARED_VERSION)
HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for shared object message");
/* Flags */
flags = *buf++;
mesg->in_gh = (flags & 0x01);
/* Reserved */
buf += 6;
/* Body */
if (mesg->in_gh) {
H5F_addr_decode (f, &buf, &(mesg->u.gh.addr));
INT32DECODE (buf, mesg->u.gh.idx);
} else {
H5G_ent_decode (f, &buf, &(mesg->u.ent));
}
/* Set return value */
ret_value=mesg;
done:
if(ret_value==NULL) {
if(mesg!=NULL)
H5MM_xfree(mesg);
} /* end if */
FUNC_LEAVE_NOAPI(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5O_shared_encode
*
* Purpose: Encodes message _MESG into buffer BUF.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, April 2, 1998
*
* Modifications:
* Robb Matzke, 1998-07-20
* Added a version number to the beginning of the message.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5O_shared_encode (H5F_t *f, uint8_t *buf/*out*/, const void *_mesg)
{
const H5O_shared_t *mesg = (const H5O_shared_t *)_mesg;
unsigned flags;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5O_shared_encode, FAIL);
/* Check args */
assert (f);
assert (buf);
assert (mesg);
/* Encode */
*buf++ = H5O_SHARED_VERSION;
flags = mesg->in_gh ? 0x01 : 0x00;
*buf++ = flags;
*buf++ = 0; /*reserved 1*/
*buf++ = 0; /*reserved 2*/
*buf++ = 0; /*reserved 3*/
*buf++ = 0; /*reserved 4*/
*buf++ = 0; /*reserved 5*/
*buf++ = 0; /*reserved 6*/
if (mesg->in_gh) {
H5F_addr_encode (f, &buf, mesg->u.gh.addr);
INT32ENCODE (buf, mesg->u.gh.idx);
} else {
H5G_ent_encode (f, &buf, &(mesg->u.ent));
}
done:
FUNC_LEAVE_NOAPI(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5O_shared_size
*
* Purpose: Returns the length of a shared object message.
*
* Return: Success: Length
*
* Failure: 0
*
* Programmer: Robb Matzke
* Thursday, April 2, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static size_t
H5O_shared_size (H5F_t *f, const void UNUSED *_mesg)
{
size_t ret_value;
FUNC_ENTER_NOAPI(H5O_shared_size, 0);
ret_value = 1 + /*the flags field */
7 + /*reserved */
MAX (H5F_SIZEOF_ADDR(f)+4, /*sharing via global heap */
H5G_SIZEOF_ENTRY(f)); /*sharing by another obj hdr */
done:
FUNC_LEAVE_NOAPI(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5O_shared_debug
*
* Purpose: Prints debugging info for the message
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, April 2, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5O_shared_debug (H5F_t UNUSED *f, const void *_mesg,
FILE *stream, int indent, int fwidth)
{
const H5O_shared_t *mesg = (const H5O_shared_t *)_mesg;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5O_shared_debug, FAIL);
/* Check args */
assert (f);
assert (mesg);
assert (stream);
assert (indent>=0);
assert (fwidth>=0);
if (mesg->in_gh) {
HDfprintf (stream, "%*s%-*s %s\n", indent, "", fwidth,
"Sharing method",
"Global heap");
HDfprintf (stream, "%*s%-*s %a\n", indent, "", fwidth,
"Collection address:",
mesg->u.gh.addr);
HDfprintf (stream, "%*s%-*s %d\n", indent, "", fwidth,
"Object ID within collection:",
mesg->u.gh.idx);
} else {
HDfprintf (stream, "%*s%-*s %s\n", indent, "", fwidth,
"Sharing method",
"Obj Hdr");
H5G_ent_debug (f, &(mesg->u.ent), stream, indent, fwidth,
HADDR_UNDEF);
}
done:
FUNC_LEAVE_NOAPI(ret_value);
}
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