EncodeLZ4HashTableInit, EncodeLZ4DictHashTableInit
EncodeLZ4HashTableInit
, EncodeLZ4DictHashTableInit
Initializes the LZ4 hash table.
Syntax
IppStatus ippsEncodeLZ4HashTableInit_8u(Ipp8u*
pHashTable
, int
srcLen
);
IppStatus ippsEncodeLZ4DictHashTableInit_8u(Ipp8u*
pHashTable
, int
srcLen
);
Include Files
ippdc.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
Parameters
- pHashTable
- Pointer to the LZ4 hash table.
- srcLen
- Length of the source data for compression.
Description
This function initializes the LZ4 hash table. Before using this function, compute the size of the LZ4 hash table using the
EncodeLZ4HashTableGetSize
function.Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error if thepHashTablepointer isNULL.
- ippStsSizeErr
- Indicates an error if thesrcLenvalue is less than, or equal to zero.
Example
/*******************************************************************************
* Copyright 2015-2021 Intel Corporation.
*
* This software and the related documents are Intel copyrighted materials, and
* your use of them is governed by the express license under which they were
* provided to you (License). Unless the License provides otherwise, you may not
* use, modify, copy, publish, distribute, disclose or transmit this software or
* the related documents without Intel's prior written permission.
*
* This software and the related documents are provided as is, with no express
* or implied warranties, other than those that are expressly stated in the
* License.
*******************************************************************************/
/*
The example below shows how to use the functions:
ippsEncodeLZ4HashTableGetSize_8u
ippsEncodeLZ4HashTableInit_8u
ippsEncodeLZ4_8u
ippsDecodeLZ4_8u
*/
#include <stdio.h>
#include <string.h>
#include <ippdc.h>
#include <ipps.h>
/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine: /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */
#define TEST_SIZE (1024)
int main(void)
{
Ipp8u *srcBuf = NULL, *comprBuf = NULL, *decomprBuf = NULL, *hashTable = NULL;
IppStatus st = ippStsNoErr;
int hashSize = 0,
comprLen = TEST_SIZE + TEST_SIZE / 255 + 16, /* Extra bytes for
uncompressible data */
decomprLen = TEST_SIZE + 33;
int i;
srcBuf = ippsMalloc_8u(TEST_SIZE);
decomprBuf = ippsMalloc_8u(decomprLen); /* Spare bytes for "wild"
(non-safe) decompression */
comprBuf = ippsMalloc_8u(comprLen);
/* Initialize source buffer */
check_sts( st = ippsVectorJaehne_8u(srcBuf, TEST_SIZE, IPP_MAX_8U) )
for(i = 0; i < TEST_SIZE; i++)
srcBuf[i] >>= 6; /* Decrease source data entropy */
/* Init and allocate hash table */
check_sts( st = ippsEncodeLZ4HashTableGetSize_8u(&hashSize) )
hashTable = ippsMalloc_8u(hashSize);
check_sts( st = ippsEncodeLZ4HashTableInit_8u(hashTable, TEST_SIZE) )
/* Compress source data */
check_sts( st = ippsEncodeLZ4_8u((const Ipp8u*)srcBuf, TEST_SIZE, comprBuf,
&comprLen, hashTable) )
/* Print compression result */
printf("Compression: %d bytes compressed into %d bytes\n", TEST_SIZE, comprLen);
/* Decompression */
decomprLen = TEST_SIZE + 33;
check_sts( st = ippsDecodeLZ4_8u((const Ipp8u*)comprBuf, comprLen, decomprBuf,
&decomprLen) )
/* Check */
if(decomprLen == TEST_SIZE)/* Decompressed size must be equal to source data size */
{
if(memcmp(srcBuf, decomprBuf, TEST_SIZE) != 0)
{
printf("Wrong decompression!\n");
st = ippStsErr;
}
else
printf("Decompressed by ippsDecodeLZ4_8u OK\n");
}
else
printf("Invalid decompressed length %d\n", decomprLen);
EXIT_MAIN
ippsFree(srcBuf);
ippsFree(comprBuf);
ippsFree(decomprBuf);
ippsFree(hashTable);
return (int)st;
}