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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: H5HFdtable.c
* Apr 10 2006
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: "Doubling table" routines for fractal heaps.
*
*-------------------------------------------------------------------------
*/
/****************/
/* 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 */
#include "H5MMprivate.h" /* Memory management */
#include "H5Vprivate.h" /* Vectors and arrays */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5HF_dtable_init
*
* Purpose: Initialize values for doubling table
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 6 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_dtable_init(H5HF_dtable_t *dtable)
{
hsize_t tmp_block_size; /* Temporary block size */
hsize_t acc_block_off; /* Accumulated block offset */
size_t u; /* Local index variable */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5HF_dtable_init)
/*
* Check arguments.
*/
HDassert(dtable);
/* Compute/cache some values */
dtable->first_row_bits = H5V_log2_of2(dtable->cparam.start_block_size) +
H5V_log2_of2(dtable->cparam.width);
dtable->max_root_rows = (dtable->cparam.max_index - dtable->first_row_bits) + 1;
dtable->max_direct_rows = (H5V_log2_of2(dtable->cparam.max_direct_size) -
H5V_log2_of2(dtable->cparam.start_block_size)) + 2;
dtable->num_id_first_row = dtable->cparam.start_block_size * dtable->cparam.width;
dtable->max_dir_blk_off_size = H5HF_SIZEOF_OFFSET_LEN(dtable->cparam.max_direct_size);
/* Build table of block sizes for each row */
if(NULL == (dtable->row_block_size = H5MM_malloc(dtable->max_root_rows * sizeof(hsize_t))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create doubling table block size table")
if(NULL == (dtable->row_block_off = H5MM_malloc(dtable->max_root_rows * sizeof(hsize_t))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create doubling table block offset table")
if(NULL == (dtable->row_dblock_free = H5MM_malloc(dtable->max_root_rows * sizeof(hsize_t))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create doubling table direct block free space table")
tmp_block_size = dtable->cparam.start_block_size;
acc_block_off = dtable->cparam.start_block_size * dtable->cparam.width;
dtable->row_block_size[0] = dtable->cparam.start_block_size;
dtable->row_block_off[0] = 0;
for(u = 1; u < dtable->max_root_rows; u++) {
dtable->row_block_size[u] = tmp_block_size;
dtable->row_block_off[u] = acc_block_off;
tmp_block_size *= 2;
acc_block_off *= 2;
} /* end for */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_dtable_init() */
/*-------------------------------------------------------------------------
* Function: H5HF_dtable_lookup
*
* Purpose: Compute the row & col of an offset in a doubling-table
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 6 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_dtable_lookup(const H5HF_dtable_t *dtable, hsize_t off, unsigned *row, unsigned *col)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_dtable_lookup)
/*
* Check arguments.
*/
HDassert(dtable);
HDassert(row);
HDassert(col);
/* Check for offset in first row */
if(off < dtable->num_id_first_row) {
*row = 0;
*col = off / dtable->cparam.start_block_size;
} /* end if */
else {
unsigned high_bit = H5V_log2_gen(off); /* Determine the high bit in the offset */
hsize_t off_mask = 1 << high_bit; /* Compute mask for determining column */
*row = (high_bit - dtable->first_row_bits) + 1;
*col = (off - off_mask) / dtable->row_block_size[*row];
} /* end else */
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF_dtable_lookup() */
/*-------------------------------------------------------------------------
* Function: H5HF_dtable_dest
*
* Purpose: Release information for doubling table
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 27 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF_dtable_dest(H5HF_dtable_t *dtable)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_dtable_dest)
/*
* Check arguments.
*/
HDassert(dtable);
/* Free the block size lookup table for the doubling table */
H5MM_xfree(dtable->row_block_size);
/* Free the block offset lookup table for the doubling table */
H5MM_xfree(dtable->row_block_off);
/* Free the direct block free space lookup table for the doubling table */
H5MM_xfree(dtable->row_dblock_free);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF_dtable_dest() */
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