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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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define H5Z_PACKAGE /*suppress error about including H5Zpkg */
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5MMprivate.h" /* Memory management */
#include "H5Ppublic.h" /* Property lists */
#include "H5Tpublic.h" /* Datatype functions */
#include "H5Zpkg.h" /* Data filters */
#ifdef H5_HAVE_FILTER_SHUFFLE
/* Interface initialization */
#define PABLO_MASK H5Z_shuffle_mask
#define INTERFACE_INIT NULL
static int interface_initialize_g = 0;
/* Local function prototypes */
static herr_t H5Z_set_local_shuffle(hid_t dcpl_id, hid_t type_id, hid_t space_id);
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_class_t H5Z_SHUFFLE[1] = {{
H5Z_FILTER_SHUFFLE, /* Filter id number */
"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 */
}};
/* Local macros */
#define H5Z_SHUFFLE_USER_NPARMS 0 /* Number of parameters that users can set */
#define H5Z_SHUFFLE_TOTAL_NPARMS 1 /* Total number of parameters for filter */
#define H5Z_SHUFFLE_PARM_SIZE 0 /* "Local" parameter for shuffling size */
/*-------------------------------------------------------------------------
* 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
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5Z_set_local_shuffle(hid_t dcpl_id, hid_t type_id, hid_t UNUSED space_id)
{
unsigned flags; /* Filter flags */
size_t cd_nelmts=H5Z_SHUFFLE_USER_NPARMS; /* Number of filter parameters */
unsigned cd_values[H5Z_SHUFFLE_TOTAL_NPARMS]; /* Filter parameters */
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5Z_set_local_shuffle, FAIL);
/* Get the filter's current parameters */
if(H5Pget_filter_by_id(dcpl_id,H5Z_FILTER_SHUFFLE,&flags,&cd_nelmts, cd_values,0,NULL)<0)
HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get shuffle parameters");
/* Check that no parameters are currently set */
if(cd_nelmts!=H5Z_SHUFFLE_USER_NPARMS)
HGOTO_ERROR(H5E_PLINE, H5E_BADVALUE, FAIL, "incorrect # of shuffle parameters");
/* Set "local" parameter for this dataset */
if((cd_values[H5Z_SHUFFLE_PARM_SIZE]=(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, H5Z_SHUFFLE_TOTAL_NPARMS, cd_values)<0)
HGOTO_ERROR(H5E_PLINE, H5E_CANTSET, FAIL, "can't set local shuffle parameters");
done:
FUNC_LEAVE_NOAPI(ret_value);
} /* end H5Z_set_local_shuffle() */
/*-------------------------------------------------------------------------
* 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
*
* Modifications:
* Quincey Koziol, November 13, 2002
* Cleaned up code.
*
*-------------------------------------------------------------------------
*/
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,j; /* Local index variables */
size_t leftover; /* Extra bytes at end of buffer */
size_t ret_value; /* Return value */
FUNC_ENTER_NOAPI(H5Z_filter_shuffle, 0);
/* 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];
/* Don't do anything for 1-byte elements */
if(bytesoftype>1) {
/* Compute the number of elements in buffer */
numofelements=nbytes/bytesoftype;
/* 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;
for(j=0; j<numofelements; j++) {
*_dest=*_src++;
_dest+=bytesoftype;
} /* end for */
} /* end for */
/* Add leftover to the end of data */
if(leftover>0) {
/* Adjust back to end of shuffled bytes */
_dest -= (bytesoftype - 1);
HDmemcpy((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;
for(j=0; j<numofelements; j++) {
*_dest++=*_src;
_src+=bytesoftype;
} /* end for */
} /* end for */
/* Add leftover to the end of data */
if(leftover>0) {
/* Adjust back to end of shuffled bytes */
_src -= (bytesoftype - 1);
HDmemcpy((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:
FUNC_LEAVE_NOAPI(ret_value);
}
#endif /*H5_HAVE_FILTER_SHUFFLE */
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