path: root/src/H5Oefl.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.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer: Robb Matzke <matzke@llnl.gov>
 *	       Tuesday, November 25, 1997
 */

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


#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fprivate.h"		/* File access				*/
#include "H5HLprivate.h"	/* Local Heaps				*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Opkg.h"             /* Object headers			*/

/* PRIVATE PROTOTYPES */
static void *H5O_efl_decode(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
    unsigned mesg_flags, unsigned *ioflags, const uint8_t *p);
static herr_t H5O_efl_encode(H5F_t *f, hbool_t disable_shared, uint8_t *p, const void *_mesg);
static void *H5O_efl_copy(const void *_mesg, void *_dest);
static size_t H5O_efl_size(const H5F_t *f, hbool_t disable_shared, const void *_mesg);
static herr_t H5O_efl_reset(void *_mesg);
static void *H5O_efl_copy_file(H5F_t *file_src, void *mesg_src,
    H5F_t *file_dst, hbool_t *recompute_size, unsigned *mesg_flags,
    H5O_copy_t *cpy_info, void *udata, hid_t dxpl_id);
static herr_t H5O_efl_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_EFL[1] = {{
    H5O_EFL_ID,		    	/*message id number		*/
    "external file list",   	/*message name for debugging    */
    sizeof(H5O_efl_t),	    	/*native message size	    	*/
    0,				/* messages are sharable?       */
    H5O_efl_decode,	    	/*decode message		*/
    H5O_efl_encode,	    	/*encode message		*/
    H5O_efl_copy,	    	/*copy native value		*/
    H5O_efl_size,	    	/*size of message on disk	*/
    H5O_efl_reset,	    	/*reset method		    	*/
    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 */
    H5O_efl_copy_file,		/* copy native value to file    */
    NULL,			/* post copy native value to file    */
    NULL,			/* get creation index		*/
    NULL,			/* set creation index		*/
    H5O_efl_debug	    	/*debug the message		*/
}};

#define H5O_EFL_VERSION		1


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_decode
 *
 * Purpose:	Decode an external file list message and return a pointer to
 *		the message (and some other data).
 *
 * Return:	Success:	Ptr to a new message struct.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 * Modification:
 *              Raymond Lu
 *              11 April 2011
 *              We allow zero dimension size starting from the 1.8.7 release.
 *              The dataset size of external storage can be zero.
 *-------------------------------------------------------------------------
 */
static void *
H5O_efl_decode(H5F_t *f, hid_t dxpl_id, H5O_t UNUSED *open_oh,
    unsigned UNUSED mesg_flags, unsigned UNUSED *ioflags, const uint8_t *p)
{
    H5O_efl_t		*mesg = NULL;
    int			version;
    const char		*s = NULL;
    H5HL_t              *heap;
    size_t		u;      /* Local index variable */
    void *ret_value;            /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

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

    if(NULL == (mesg = (H5O_efl_t *)H5MM_calloc(sizeof(H5O_efl_t))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Version */
    version = *p++;
    if(version != H5O_EFL_VERSION)
	HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for external file list message")

    /* Reserved */
    p += 3;

    /* Number of slots */
    UINT16DECODE(p, mesg->nalloc);
    HDassert(mesg->nalloc>0);
    UINT16DECODE(p, mesg->nused);
    HDassert(mesg->nused <= mesg->nalloc);

    /* Heap address */
    H5F_addr_decode(f, &p, &(mesg->heap_addr));

#ifndef NDEBUG
    HDassert(H5F_addr_defined(mesg->heap_addr));

    if(NULL == (heap = H5HL_protect(f, dxpl_id, mesg->heap_addr, H5AC_READ)))
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "unable to read protect link value")

    s = (const char *)H5HL_offset_into(heap, 0);

    HDassert(s && !*s);

    if(H5HL_unprotect(heap) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "unable to read unprotect link value")
    heap = NULL;
#endif

    /* Decode the file list */
    mesg->slot = (H5O_efl_entry_t *)H5MM_calloc(mesg->nalloc * sizeof(H5O_efl_entry_t));
    if(NULL == mesg->slot)
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    if(NULL == (heap = H5HL_protect(f, dxpl_id, mesg->heap_addr, H5AC_READ)))
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "unable to read protect link value")
    for(u = 0; u < mesg->nused; u++) {
	/* Name */
	H5F_DECODE_LENGTH (f, p, mesg->slot[u].name_offset);

        s = (const char *)H5HL_offset_into(heap, mesg->slot[u].name_offset);
	HDassert(s && *s);
	mesg->slot[u].name = H5MM_xstrdup (s);
        HDassert(mesg->slot[u].name);

	/* File offset */
	H5F_DECODE_LENGTH (f, p, mesg->slot[u].offset);

	/* Size */
	H5F_DECODE_LENGTH (f, p, mesg->slot[u].size);
    } /* end for */

    if(H5HL_unprotect(heap) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "unable to read unprotect link value")
    heap = NULL;

    /* Set return value */
    ret_value = mesg;

done:
    if(ret_value == NULL)
        if(mesg != NULL)
            H5MM_xfree(mesg);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_efl_decode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_encode
 *
 * Purpose:	Encodes a message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_efl_encode(H5F_t *f, hbool_t UNUSED disable_shared, uint8_t *p, const void *_mesg)
{
    const H5O_efl_t	*mesg = (const H5O_efl_t *)_mesg;
    size_t		u;      /* Local index variable */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

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

    /* Version */
    *p++ = H5O_EFL_VERSION;

    /* Reserved */
    *p++ = 0;
    *p++ = 0;
    *p++ = 0;

    /* Number of slots */
    HDassert(mesg->nalloc > 0);
    UINT16ENCODE(p, mesg->nused); /*yes, twice*/
    HDassert(mesg->nused > 0 && mesg->nused <= mesg->nalloc);
    UINT16ENCODE(p, mesg->nused);

    /* Heap address */
    HDassert(H5F_addr_defined(mesg->heap_addr));
    H5F_addr_encode(f, &p, mesg->heap_addr);

    /* Encode file list */
    for(u = 0; u < mesg->nused; u++) {
	/*
	 * The name should have been added to the heap when the dataset was
	 * created.
	 */
	HDassert(mesg->slot[u].name_offset);
	H5F_ENCODE_LENGTH(f, p, mesg->slot[u].name_offset);
	H5F_ENCODE_LENGTH(f, p, (hsize_t)mesg->slot[u].offset);
	H5F_ENCODE_LENGTH(f, p, mesg->slot[u].size);
    } /* end for */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_efl_encode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_copy
 *
 * Purpose:	Copies a message from _MESG to _DEST, allocating _DEST if
 *		necessary.
 *
 * Return:	Success:	Ptr to _DEST
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_efl_copy(const void *_mesg, void *_dest)
{
    const H5O_efl_t	*mesg = (const H5O_efl_t *) _mesg;
    H5O_efl_t		*dest = (H5O_efl_t *) _dest;
    size_t		u;              /* Local index variable */
    void                *ret_value;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* check args */
    HDassert(mesg);
    if(!dest) {
	if(NULL == (dest = (H5O_efl_t *)H5MM_calloc(sizeof(H5O_efl_t))))
	    HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, NULL, "can't allocate efl message")
        if(NULL == (dest->slot = (H5O_efl_entry_t *)H5MM_calloc(mesg->nalloc * sizeof(H5O_efl_entry_t))))
	    HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, NULL, "can't allocate efl message slots")
    } /* end if */
    else if(dest->nalloc < mesg->nalloc) {
        H5O_efl_entry_t *temp_slot;     /* Temporary pointer to new slot information */

        /* Allocate new 'slot' information */
        if(NULL == (temp_slot = (H5O_efl_entry_t *)H5MM_calloc(mesg->nalloc * sizeof(H5O_efl_entry_t))))
            HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, NULL, "can't allocate efl message slots")

        /* Release old 'slot' information */
        for(u = 0; u < dest->nused; u++)
            dest->slot[u].name = (char *)H5MM_xfree(dest->slot[u].name);
        dest->slot = (H5O_efl_entry_t *)H5MM_xfree(dest->slot);

        /* Point to new 'slot' information */
        dest->slot = temp_slot;
    } /* end if */
    else {
        /* Release old 'slot' information */
        for(u = 0; u < dest->nused; u++)
            dest->slot[u].name = (char *)H5MM_xfree(dest->slot[u].name);
    } /* end else */
    dest->heap_addr = mesg->heap_addr;
    dest->nalloc = mesg->nalloc;
    dest->nused = mesg->nused;

    for(u = 0; u < mesg->nused; u++) {
	dest->slot[u] = mesg->slot[u];
	if(NULL == (dest->slot[u].name = H5MM_xstrdup(mesg->slot[u].name)))
            HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, NULL, "can't allocate efl message slot name")
    } /* end for */

    /* Set return value */
    ret_value = dest;

done:
    if(NULL == ret_value) {
        if(dest && NULL == _dest) {
            if(dest->slot) {
                for(u = 0; u < mesg->nused; u++) {
                    if(dest->slot[u].name != NULL && dest->slot[u].name != mesg->slot[u].name)
                        dest->slot[u].name = (char *)H5MM_xfree(dest->slot[u].name);
                } /* end for */
                dest->slot = (H5O_efl_entry_t *)H5MM_xfree(dest->slot);
            } /* end if */
            dest = (H5O_efl_t *)H5MM_xfree(dest);
        } /* end if */
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_efl_copy() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_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 message alignment. This
 *		function doesn't count unused slots.
 *
 * Return:	Success:	Message data size in bytes.
 *
 *		Failure:	0
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5O_efl_size(const H5F_t *f, hbool_t UNUSED disable_shared, const void *_mesg)
{
    const H5O_efl_t	*mesg = (const H5O_efl_t *) _mesg;
    size_t		ret_value = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

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

    ret_value = (size_t)H5F_SIZEOF_ADDR(f) +			/*heap address	*/
		2 +					/*slots allocated*/
		2 +					/*num slots used*/
		4 +					/*reserved	*/
		mesg->nused * ((size_t)H5F_SIZEOF_SIZE(f) +	/*name offset	*/
			       (size_t)H5F_SIZEOF_SIZE(f) +	/*file offset	*/
			       (size_t)H5F_SIZEOF_SIZE(f));	/*file size	*/

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_efl_size() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_reset
 *
 * Purpose:	Frees internal pointers and resets the message to an
 *		initialial state.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_efl_reset(void *_mesg)
{
    H5O_efl_t	*mesg = (H5O_efl_t *) _mesg;
    size_t	u;              /* Local index variable */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    HDassert(mesg);

    /* reset */
    if(mesg->slot) {
        for(u = 0; u < mesg->nused; u++)
            mesg->slot[u].name = (char *)H5MM_xfree(mesg->slot[u].name);
        mesg->slot = (H5O_efl_entry_t *)H5MM_xfree(mesg->slot);
    } /* end if */
    mesg->heap_addr = HADDR_UNDEF;
    mesg->nused = mesg->nalloc = 0;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_efl_reset() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_total_size
 *
 * Purpose:	Return the total size of the external file list by summing
 *		the sizes of all of the files.
 *
 * Return:	Success:	Total reserved size for external data.
 *
 *		Failure:	0
 *
 * Programmer:	Robb Matzke
 *              Tuesday, March  3, 1998
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5O_efl_total_size (H5O_efl_t *efl)
{
    hsize_t	ret_value = 0, tmp;

    FUNC_ENTER_NOAPI_NOINIT

    if(efl->nused > 0 && H5O_EFL_UNLIMITED == efl->slot[efl->nused - 1].size)
	ret_value = H5O_EFL_UNLIMITED;
    else {
        size_t		u;      /* Local index variable */

	for(u = 0; u < efl->nused; u++, ret_value = tmp) {
	    tmp = ret_value + efl->slot[u].size;
	    if(tmp <= ret_value)
		HGOTO_ERROR(H5E_EFL, H5E_OVERFLOW, 0, "total external storage size overflowed");
	} /* end for */
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_efl_total_size() */


/*-------------------------------------------------------------------------
 * Function:    H5O_efl_copy_file
 *
 * Purpose:     Copies an efl message from _MESG to _DEST in file
 *
 * Return:      Success:        Ptr to _DEST
 *
 *              Failure:        NULL
 *
 * Programmer:  Peter Cao
 *              September 29, 2005
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_efl_copy_file(H5F_t UNUSED *file_src, void *mesg_src, H5F_t *file_dst,
    hbool_t UNUSED *recompute_size, unsigned UNUSED *mesg_flags,
    H5O_copy_t UNUSED *cpy_info, void UNUSED *_udata, hid_t dxpl_id)
{
    H5O_efl_t   *efl_src = (H5O_efl_t *) mesg_src;
    H5O_efl_t   *efl_dst = NULL;
    H5HL_t      *heap = NULL;                           /* Pointer to local heap for EFL file names */
    size_t      idx, size, name_offset, heap_size;
    void        *ret_value;          /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* check args */
    HDassert(efl_src);
    HDassert(file_dst);

    /* Allocate space for the destination efl */
    if(NULL == (efl_dst = (H5O_efl_t *)H5MM_calloc(sizeof(H5O_efl_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Copy the "top level" information */
    HDmemcpy(efl_dst, efl_src, sizeof(H5O_efl_t));

    /* Determine size needed for destination heap */
    heap_size = H5HL_ALIGN(1);  /* "empty" name */
    for(idx = 0; idx < efl_src->nused; idx++)
        heap_size += H5HL_ALIGN(HDstrlen(efl_src->slot[idx].name) + 1);

    /* Create name heap */
    if(H5HL_create(file_dst, dxpl_id, heap_size, &efl_dst->heap_addr/*out*/) < 0)
        HGOTO_ERROR(H5E_EFL, H5E_CANTINIT, NULL, "can't create heap")

    /* Pin the heap down in memory */
    if(NULL == (heap = H5HL_protect(file_dst, dxpl_id, efl_dst->heap_addr, H5AC_WRITE)))
        HGOTO_ERROR(H5E_EFL, H5E_PROTECT, NULL, "unable to protect EFL file name heap")

    /* Insert "empty" name first */
    if((size_t)(-1) == (name_offset = H5HL_insert(file_dst, dxpl_id, heap, (size_t)1, "")))
        HGOTO_ERROR(H5E_EFL, H5E_CANTINSERT, NULL, "can't insert file name into heap")
    HDassert(0 == name_offset);

    /* allocate array of external file entries */
    if(efl_src->nalloc > 0) {
        size = efl_src->nalloc * sizeof(H5O_efl_entry_t);
        if((efl_dst->slot = (H5O_efl_entry_t *)H5MM_calloc(size)) == NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

        /* copy content from the source. Need to update later */
        HDmemcpy(efl_dst->slot, efl_src->slot, size);
    } /* end if */

    /* copy the name from the source */
    for(idx = 0; idx < efl_src->nused; idx++) {
        efl_dst->slot[idx].name = H5MM_xstrdup(efl_src->slot[idx].name);
        if((size_t)(-1) == (efl_dst->slot[idx].name_offset = H5HL_insert(file_dst, dxpl_id, heap,
                HDstrlen(efl_dst->slot[idx].name) + 1, efl_dst->slot[idx].name)))
            HGOTO_ERROR(H5E_EFL, H5E_CANTINSERT, NULL, "can't insert file name into heap")
    } /* end for */

    /* Set return value */
    ret_value = efl_dst;

done:
    /* Release resources */
    if(heap && H5HL_unprotect(heap) < 0)
        HDONE_ERROR(H5E_EFL, H5E_PROTECT, NULL, "unable to unprotect EFL file name heap")
    if(!ret_value)
        if(efl_dst)
            H5MM_xfree(efl_dst);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_efl_copy_file() */


/*-------------------------------------------------------------------------
 * Function:	H5O_efl_debug
 *
 * Purpose:	Prints debugging info for a message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, November 25, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_efl_debug(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_mesg, FILE * stream,
	      int indent, int fwidth)
{
    const H5O_efl_t	   *mesg = (const H5O_efl_t *) _mesg;
    size_t		    u;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

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

    HDfprintf(stream, "%*s%-*s %a\n", indent, "", fwidth,
	      "Heap address:", mesg->heap_addr);

    HDfprintf(stream, "%*s%-*s %u/%u\n", indent, "", fwidth,
	      "Slots used/allocated:",
	      mesg->nused, mesg->nalloc);

    for(u = 0; u < mesg->nused; u++) {
        char		    buf[64];

	HDsnprintf(buf, sizeof(buf), "File %u", (unsigned)u);
	HDfprintf(stream, "%*s%s:\n", indent, "", buf);

	HDfprintf(stream, "%*s%-*s \"%s\"\n", indent+3, "", MAX (fwidth-3, 0),
		  "Name:",
		  mesg->slot[u].name);

	HDfprintf(stream, "%*s%-*s %lu\n", indent+3, "", MAX (fwidth-3, 0),
		  "Name offset:",
		  (unsigned long)(mesg->slot[u].name_offset));

	HDfprintf(stream, "%*s%-*s %lu\n", indent+3, "", MAX (fwidth-3, 0),
		   "Offset of data in file:",
		   (unsigned long)(mesg->slot[u].offset));

	HDfprintf(stream, "%*s%-*s %lu\n", indent+3, "", MAX (fwidth-3, 0),
		   "Bytes reserved for data:",
		   (unsigned long)(mesg->slot[u].size));
    } /* end for */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_efl_debug() */