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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "netcdf_filter_build.h"
#ifndef H5Z_FILTER_SHUFFLE
#define H5Z_FILTER_SHUFFLE 2
#endif
#ifndef H5Z_SHUFFLE_TOTAL_NPARMS
#define H5Z_SHUFFLE_TOTAL_NPARMS 1
#endif
#ifndef H5Z_SHUFFLE_USER_NPARMS
#define H5Z_SHUFFLE_USER_NPARMS 0
#endif
/* Local function prototypes */
#ifdef USE_HDF5
static herr_t H5Z__set_local_shuffle(hid_t dcpl_id, hid_t type_id, hid_t space_id);
#else
#define H5Z__set_local_shuffle NULL
#endif
static size_t H5Z__filter_shuffle(unsigned flags, size_t cd_nelmts,
const unsigned cd_values[], size_t nbytes, size_t *buf_size, void **buf);
/* This message derives from H5Z */
const H5Z_class2_t H5Z_SHUFFLE[1] = {{
H5Z_CLASS_T_VERS, /* H5Z_class_t version */
H5Z_FILTER_SHUFFLE, /* Filter id number */
1, /* encoder_present flag (set to true) */
1, /* decoder_present flag (set to true) */
"shuffle", /* Filter name for debugging */
NULL, /* The "can apply" callback */
H5Z__set_local_shuffle, /* The "set local" callback */
H5Z__filter_shuffle, /* The actual filter function */
}};
/* External Discovery Functions */
DLLEXPORT
H5PL_type_t
H5PLget_plugin_type(void)
{
return H5PL_TYPE_FILTER;
}
DLLEXPORT
const void*
H5PLget_plugin_info(void)
{
return H5Z_SHUFFLE;
}
/* Local macros */
#define H5Z_SHUFFLE_PARM_SIZE 0 /* "Local" parameter for shuffling size */
#ifdef USE_HDF5
/*-------------------------------------------------------------------------
* Function: H5Z__set_local_shuffle
*
* Purpose: Set the "local" dataset parameter for data shuffling to be
* the size of the datatype.
*
* Return: Success: Non-negative
* Failure: Negative
*
* Programmer: Quincey Koziol
* Monday, April 7, 2003
*
*-------------------------------------------------------------------------
*/
static herr_t
H5Z__set_local_shuffle(hid_t dcpl_id, hid_t type_id, hid_t space_id)
{
unsigned flags = 0; /* Filter flags */
unsigned cd_values[H5Z_SHUFFLE_TOTAL_NPARMS]; /* Filter parameters */
herr_t ret_value = 1; /* Return value */
/* Set "local" parameter for this dataset */
if((cd_values[0] = (unsigned)H5Tget_size(type_id)) == 0)
HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype size")
/* Modify the filter's parameters for this dataset */
if(H5Pmodify_filter(dcpl_id, H5Z_FILTER_SHUFFLE, flags, (size_t)H5Z_SHUFFLE_TOTAL_NPARMS, cd_values) < 0)
HGOTO_ERROR(H5E_PLINE, H5E_CANTSET, FAIL, "can't set local shuffle parameters")
done:
return ret_value;
} /* end H5Z__set_local_shuffle() */
#endif
/*-------------------------------------------------------------------------
* Function: H5Z__filter_shuffle
*
* Purpose: Implement an I/O filter which "de-interlaces" a block of data
* by putting all the bytes in a byte-position for each element
* together in the block. For example, for 4-byte elements stored
* as: 012301230123, shuffling will store them as: 000111222333
* Usually, the bytes in each byte position are more related to
* each other and putting them together will increase compression.
*
* Return: Success: Size of buffer filtered
* Failure: 0
*
* Programmer: Kent Yang
* Wednesday, November 13, 2002
*
*-------------------------------------------------------------------------
*/
static size_t
H5Z__filter_shuffle(unsigned flags, size_t cd_nelmts, const unsigned cd_values[],
size_t nbytes, size_t *buf_size, void **buf)
{
void *dest = NULL; /* Buffer to deposit [un]shuffled bytes into */
unsigned char *_src=NULL; /* Alias for source buffer */
unsigned char *_dest=NULL; /* Alias for destination buffer */
unsigned bytesoftype; /* Number of bytes per element */
size_t numofelements; /* Number of elements in buffer */
size_t i; /* Local index variables */
#ifdef NO_DUFFS_DEVICE
size_t j; /* Local index variable */
#endif /* NO_DUFFS_DEVICE */
size_t leftover; /* Extra bytes at end of buffer */
size_t ret_value = 0; /* Return value */
/* Check arguments */
if (cd_nelmts!=H5Z_SHUFFLE_TOTAL_NPARMS || cd_values[H5Z_SHUFFLE_PARM_SIZE]==0)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid shuffle parameters")
/* Get the number of bytes per element from the parameter block */
bytesoftype=cd_values[H5Z_SHUFFLE_PARM_SIZE];
/* Compute the number of elements in buffer */
numofelements=nbytes/bytesoftype;
/* Don't do anything for 1-byte elements, or "fractional" elements */
if(bytesoftype > 1 && numofelements > 1) {
/* Compute the leftover bytes if there are any */
leftover = nbytes%bytesoftype;
/* Allocate the destination buffer */
if (NULL==(dest = H5MM_malloc(nbytes)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for shuffle buffer")
if(flags & H5Z_FLAG_REVERSE) {
/* Get the pointer to the source buffer */
_src =(unsigned char *)(*buf);
/* Input; unshuffle */
for(i=0; i<bytesoftype; i++) {
_dest=((unsigned char *)dest)+i;
#define DUFF_GUTS \
*_dest=*_src++; \
_dest+=bytesoftype;
#ifdef NO_DUFFS_DEVICE
j = numofelements;
while(j > 0) {
DUFF_GUTS;
j--;
} /* end for */
#else /* NO_DUFFS_DEVICE */
{
size_t duffs_index; /* Counting index for Duff's device */
duffs_index = (numofelements + 7) / 8;
switch (numofelements % 8) {
default:
HDassert(0 && "This Should never be executed!");
break;
case 0:
do
{
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 7:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 6:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 5:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 4:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 3:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 2:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 1:
DUFF_GUTS
} while (--duffs_index > 0);
} /* end switch */
}
#endif /* NO_DUFFS_DEVICE */
#undef DUFF_GUTS
} /* end for */
/* Add leftover to the end of data */
if(leftover>0) {
/* Adjust back to end of shuffled bytes */
_dest -= (bytesoftype - 1); /*lint !e794 _dest is initialized */
H5MM_memcpy((void*)_dest, (void*)_src, leftover);
}
} /* end if */
else {
/* Get the pointer to the destination buffer */
_dest =(unsigned char *)dest;
/* Output; shuffle */
for(i=0; i<bytesoftype; i++) {
_src=((unsigned char *)(*buf))+i;
#define DUFF_GUTS \
*_dest++=*_src; \
_src+=bytesoftype;
#ifdef NO_DUFFS_DEVICE
j = numofelements;
while(j > 0) {
DUFF_GUTS;
j--;
} /* end for */
#else /* NO_DUFFS_DEVICE */
{
size_t duffs_index; /* Counting index for Duff's device */
duffs_index = (numofelements + 7) / 8;
switch (numofelements % 8) {
default:
HDassert(0 && "This Should never be executed!");
break;
case 0:
do
{
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 7:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 6:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 5:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 4:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 3:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 2:
DUFF_GUTS
H5_ATTR_FALLTHROUGH
case 1:
DUFF_GUTS
} while (--duffs_index > 0);
} /* end switch */
}
#endif /* NO_DUFFS_DEVICE */
#undef DUFF_GUTS
} /* end for */
/* Add leftover to the end of data */
if(leftover>0) {
/* Adjust back to end of shuffled bytes */
_src -= (bytesoftype - 1); /*lint !e794 _src is initialized */
H5MM_memcpy((void*)_dest, (void*)_src, leftover);
}
} /* end else */
/* Free the input buffer */
H5MM_xfree(*buf);
/* Set the buffer information to return */
*buf = dest;
*buf_size=nbytes;
} /* end else */
/* Set the return value */
ret_value = nbytes;
done:
return ret_value;
}
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