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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5HFdtable.c
*
* Purpose: "Doubling table" routines for fractal heaps.
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5HFmodule.h" /* This source code file is part of the H5HF module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5HFpkg.h" /* Fractal heaps */
#include "H5MMprivate.h" /* Memory management */
#include "H5VMprivate.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
*
*-------------------------------------------------------------------------
*/
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_PACKAGE
/*
* Check arguments.
*/
assert(dtable);
/* Compute/cache some values */
dtable->start_bits = H5VM_log2_of2((uint32_t)dtable->cparam.start_block_size);
dtable->first_row_bits = dtable->start_bits + H5VM_log2_of2(dtable->cparam.width);
dtable->max_root_rows = (dtable->cparam.max_index - dtable->first_row_bits) + 1;
dtable->max_direct_bits = H5VM_log2_of2((uint32_t)dtable->cparam.max_direct_size);
dtable->max_direct_rows = (dtable->max_direct_bits - dtable->start_bits) + 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 = (hsize_t *)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 = (hsize_t *)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_tot_dblock_free = (hsize_t *)H5MM_malloc(dtable->max_root_rows * sizeof(hsize_t))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"can't create doubling table total direct block free space table")
if (NULL == (dtable->row_max_dblock_free = (size_t *)H5MM_malloc(dtable->max_root_rows * sizeof(size_t))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"can't create doubling table max. 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
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF__dtable_lookup(const H5HF_dtable_t *dtable, hsize_t off, unsigned *row, unsigned *col)
{
FUNC_ENTER_PACKAGE_NOERR
/*
* Check arguments.
*/
assert(dtable);
assert(row);
assert(col);
/* Check for offset in first row */
if (off < dtable->num_id_first_row) {
*row = 0;
H5_CHECKED_ASSIGN(*col, unsigned, (off / dtable->cparam.start_block_size), hsize_t);
} /* end if */
else {
unsigned high_bit = H5VM_log2_gen(off); /* Determine the high bit in the offset */
hsize_t off_mask = ((hsize_t)1) << high_bit; /* Compute mask for determining column */
*row = (high_bit - dtable->first_row_bits) + 1;
H5_CHECKED_ASSIGN(*col, unsigned, ((off - off_mask) / dtable->row_block_size[*row]), hsize_t);
} /* 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
*
*-------------------------------------------------------------------------
*/
herr_t
H5HF__dtable_dest(H5HF_dtable_t *dtable)
{
FUNC_ENTER_PACKAGE_NOERR
/*
* Check arguments.
*/
assert(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 total direct block free space lookup table for the doubling table */
H5MM_xfree(dtable->row_tot_dblock_free);
/* Free the max. direct block free space lookup table for the doubling table */
H5MM_xfree(dtable->row_max_dblock_free);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF__dtable_dest() */
/*-------------------------------------------------------------------------
* Function: H5HF__dtable_size_to_row
*
* Purpose: Compute row that can hold block of a certain size
*
* Return: Non-negative on success (can't fail)
*
*-------------------------------------------------------------------------
*/
unsigned
H5HF__dtable_size_to_row(const H5HF_dtable_t *dtable, size_t block_size)
{
unsigned row = 0; /* Row where block will fit */
FUNC_ENTER_PACKAGE_NOERR
/*
* Check arguments.
*/
assert(dtable);
if (block_size == dtable->cparam.start_block_size)
row = 0;
else
row =
(H5VM_log2_of2((uint32_t)block_size) - H5VM_log2_of2((uint32_t)dtable->cparam.start_block_size)) +
1;
FUNC_LEAVE_NOAPI(row)
} /* end H5HF__dtable_size_to_row() */
/*-------------------------------------------------------------------------
* Function: H5HF__dtable_size_to_rows
*
* Purpose: Compute # of rows of indirect block of a given size
*
* Return: Non-negative on success (can't fail)
*
*-------------------------------------------------------------------------
*/
unsigned
H5HF__dtable_size_to_rows(const H5HF_dtable_t *dtable, hsize_t size)
{
unsigned rows = 0; /* # of rows required for indirect block */
FUNC_ENTER_PACKAGE_NOERR
/*
* Check arguments.
*/
assert(dtable);
rows = (H5VM_log2_gen(size) - dtable->first_row_bits) + 1;
FUNC_LEAVE_NOAPI(rows)
} /* end H5HF__dtable_size_to_rows() */
/*-------------------------------------------------------------------------
* Function: H5HF__dtable_span_size
*
* Purpose: Compute the size covered by a span of entries
*
* Return: Non-zero span size on success/zero on failure
*
*-------------------------------------------------------------------------
*/
hsize_t
H5HF__dtable_span_size(const H5HF_dtable_t *dtable, unsigned start_row, unsigned start_col,
unsigned num_entries)
{
unsigned start_entry; /* Entry for first block covered */
unsigned end_row; /* Row for last block covered */
unsigned end_col; /* Column for last block covered */
unsigned end_entry; /* Entry for last block covered */
hsize_t acc_span_size = 0; /* Accumulated span size */
FUNC_ENTER_PACKAGE_NOERR
/*
* Check arguments.
*/
assert(dtable);
assert(num_entries > 0);
/* Compute starting entry */
start_entry = (start_row * dtable->cparam.width) + start_col;
/* Compute ending entry, column & row */
end_entry = (start_entry + num_entries) - 1;
end_row = end_entry / dtable->cparam.width;
end_col = end_entry % dtable->cparam.width;
/* Initialize accumulated span size */
acc_span_size = 0;
/* Compute span size covered */
/* Check for multi-row span */
if (start_row != end_row) {
/* Accommodate partial starting row */
if (start_col > 0) {
acc_span_size = dtable->row_block_size[start_row] * (dtable->cparam.width - start_col);
start_row++;
} /* end if */
/* Accumulate full rows */
while (start_row < end_row) {
acc_span_size += dtable->row_block_size[start_row] * dtable->cparam.width;
start_row++;
} /* end while */
/* Accommodate partial ending row */
acc_span_size += dtable->row_block_size[start_row] * (end_col + 1);
} /* end if */
else {
/* Span is in same row */
acc_span_size = dtable->row_block_size[start_row] * ((end_col - start_col) + 1);
} /* end else */
FUNC_LEAVE_NOAPI(acc_span_size)
} /* end H5HF__dtable_span_size() */
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