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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5HFtiny.c
* Aug 14 2006
* Quincey Koziol <koziol@hdfgroup.org>
*
* Purpose: Routines for "tiny" objects in fractal heap
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#define H5HF_PACKAGE /*suppress error about including H5HFpkg */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5HFpkg.h" /* Fractal heaps */
/****************/
/* Local Macros */
/****************/
/* Tiny object length information */
#define H5HF_TINY_LEN_SHORT 16 /* Max. length able to be encoded in first heap ID byte */
#define H5HF_TINY_MASK_SHORT 0x0F /* Mask for length in first heap ID byte */
#define H5HF_TINY_MASK_EXT 0x0FFF /* Mask for length in two heap ID bytes */
#define H5HF_TINY_MASK_EXT_1 0x0F00 /* Mask for length in first byte of two heap ID bytes */
#define H5HF_TINY_MASK_EXT_2 0x00FF /* Mask for length in second byte of two heap ID bytes */
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5HF_tiny_init
*
* Purpose: Initialize information for tracking 'tiny' objects
*
* Return: SUCCEED/FAIL
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Aug 14 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_tiny_init(H5HF_hdr_t *hdr)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_tiny_init)
/*
* Check arguments.
*/
HDassert(hdr);
/* Compute information about 'tiny' objects for the heap */
/* Check if tiny objects need an extra byte for their length */
/* (account for boundary condition when length of an object would need an
* extra byte, but using that byte means that the extra length byte is
* unneccessary)
*/
if((hdr->id_len - 1) <= H5HF_TINY_LEN_SHORT) {
hdr->tiny_max_len = hdr->id_len - 1;
hdr->tiny_len_extended = FALSE;
} /* end if */
else if((hdr->id_len - 1) == (H5HF_TINY_LEN_SHORT + 1)) {
hdr->tiny_max_len = H5HF_TINY_LEN_SHORT;
hdr->tiny_len_extended = FALSE;
} /* end if */
else {
hdr->tiny_max_len = hdr->id_len - 2;
hdr->tiny_len_extended = TRUE;
} /* end else */
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF_tiny_init() */
/*-------------------------------------------------------------------------
* Function: H5HF_tiny_insert
*
* Purpose: Pack a 'tiny' object in a heap ID
*
* Return: SUCCEED/FAIL
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Aug 14 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_tiny_insert(H5HF_hdr_t *hdr, size_t obj_size, const void *obj, void *_id)
{
uint8_t *id = (uint8_t *)_id; /* Pointer to ID buffer */
size_t enc_obj_size; /* Encoded object size */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5HF_tiny_insert)
#ifdef QAK
HDfprintf(stderr, "%s: obj_size = %Zu\n", FUNC, obj_size);
#endif /* QAK */
/*
* Check arguments.
*/
HDassert(hdr);
HDassert(obj_size <= hdr->tiny_max_len);
HDassert(obj_size <= (H5HF_TINY_MASK_EXT + 1));
HDassert(obj);
HDassert(id);
/* Adjust object's size for encoding it */
enc_obj_size = obj_size - 1;
/* Encode object into ID */
if(!hdr->tiny_len_extended) {
*id++ = H5HF_ID_VERS_CURR | H5HF_ID_TYPE_TINY |
(enc_obj_size & H5HF_TINY_MASK_SHORT);
} /* end if */
else {
*id++ = H5HF_ID_VERS_CURR | H5HF_ID_TYPE_TINY |
((enc_obj_size & H5HF_TINY_MASK_EXT_1) >> 8);
*id++ = enc_obj_size & H5HF_TINY_MASK_EXT_2;
} /* end else */
HDmemcpy(id, obj, obj_size);
/* Update statistics about heap */
hdr->tiny_size += obj_size;
hdr->tiny_nobjs++;
/* Mark heap header as modified */
if(H5HF_hdr_dirty(hdr) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark heap header as dirty")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_tiny_insert() */
/*-------------------------------------------------------------------------
* Function: H5HF_tiny_get_obj_len
*
* Purpose: Get the size of a 'tiny' object in a fractal heap
*
* Return: SUCCEED/FAIL
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Aug 14 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_tiny_get_obj_len(H5HF_hdr_t *hdr, const uint8_t *id, size_t *obj_len_p)
{
size_t enc_obj_size; /* Encoded object size */
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_tiny_get_obj_len)
/*
* Check arguments.
*/
HDassert(hdr);
HDassert(id);
HDassert(obj_len_p);
/* Check if 'tiny' object ID is in extended form, and retrieve encoded size */
if(!hdr->tiny_len_extended)
enc_obj_size = *id & H5HF_TINY_MASK_SHORT;
else
enc_obj_size = ((*id & H5HF_TINY_MASK_EXT_1) << 8) | (*(id + 1) & H5HF_TINY_MASK_EXT_2);
/* Set the object's length */
*obj_len_p = enc_obj_size + 1;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF_tiny_get_obj_len() */
/*-------------------------------------------------------------------------
* Function: H5HF_tiny_read
*
* Purpose: Read a 'tiny' object from the heap
*
* Return: SUCCEED/FAIL
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Aug 8 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_tiny_read(H5HF_hdr_t *hdr, const uint8_t *id, void *obj)
{
size_t enc_obj_size; /* Encoded object size */
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_tiny_read)
/*
* Check arguments.
*/
HDassert(hdr);
HDassert(id);
HDassert(obj);
/* Check if 'tiny' object ID is in extended form */
if(!hdr->tiny_len_extended) {
/* Retrieve the object's encoded length */
enc_obj_size = *id & H5HF_TINY_MASK_SHORT;
/* Advance past flag byte(s) */
id++;
} /* end if */
else {
/* Retrieve the object's encoded length */
enc_obj_size = ((*id & H5HF_TINY_MASK_EXT_1) << 8) | (*(id + 1) & H5HF_TINY_MASK_EXT_2);
/* Advance past flag byte(s) */
id+=2;
} /* end else */
/* Retrieve the object's data */
HDmemcpy(obj, id, (enc_obj_size + 1));
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF_tiny_read() */
/*-------------------------------------------------------------------------
* Function: H5HF_tiny_remove
*
* Purpose: Remove a 'tiny' object from the heap statistics
*
* Return: SUCCEED/FAIL
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Aug 14 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_tiny_remove(H5HF_hdr_t *hdr, const uint8_t *id)
{
size_t enc_obj_size; /* Encoded object size */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5HF_tiny_remove)
/*
* Check arguments.
*/
HDassert(hdr);
HDassert(id);
/* Check if 'tiny' object ID is in extended form */
if(!hdr->tiny_len_extended)
enc_obj_size = *id & H5HF_TINY_MASK_SHORT;
else
enc_obj_size = ((*id & H5HF_TINY_MASK_EXT_1) << 8) | (*(id + 1) & H5HF_TINY_MASK_EXT_2);
/* Update statistics about heap */
hdr->tiny_size -= (enc_obj_size + 1);
hdr->tiny_nobjs--;
/* Mark heap header as modified */
if(H5HF_hdr_dirty(hdr) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark heap header as dirty")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_tiny_remove() */
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