Developer Reference

  • 2020
  • 10/21/2020
  • Public Content


Calculates the size of the LZ4 hash table.


IppStatus ippsEncodeLZ4HashTableGetSize(int*
Include Files
Domain Dependencies
Pointer to the variable containing the size of the LZ4 hash table.
This function calculates the size of the memory buffer that must be allocated for the LZ4 hash table.
Return Values
Indicates no error.
Indicates an error if the
pointer is


/******************************************************************************* * Copyright 2015-2020 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; }

Product and Performance Information


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