Visible to Intel only — GUID: GUID-6F990288-F819-4D61-A568-7603B8ECF0FE
Visible to Intel only — GUID: GUID-6F990288-F819-4D61-A568-7603B8ECF0FE
EncodeLZOGetSize
Calculates the size of LZO encoding structure.
Syntax
IppStatus ippsEncodeLZOGetSize(IppLZOMethod method, Ipp32u maxInputLen, Ipp32u* pSize);
Include Files
ippdc.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
method |
Specifies required LZO compression method, possible values are listed in Table "method Parameter"). |
maxInputLen |
Specifies the maximum length of the input data buffer during compression operations. Not required for the IppLZO1XST and IppLZO1X1ST compression methods. |
pSize |
Pointer to the variable, receiving the size of LZO encoding structure. |
Description
This function calculates the size of the memory buffer that must be allocated for the LZO encoding structure.
For the single-thread compression (method = IppLZO1XST) the size of the structure is fixed, and the value of the maxInputLen parameter is ignored, for example, it can be set to 0.
For the multi-threaded compression (method = IppLZO1XMT) maxInputLen parameter is important and affects the size of the structure. If it is set to 0, then each compression operation starts with memory allocation for internal buffers and ends with memory freeing. This significantly decreases the performance of compression/decompression.
Code example shows how the Intel IPP functions for the LZO compression can be used.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error if the pointer pSize is NULL. |
ippStsBadArgErr |
Indicates an error if the parameter method has an illegal value. |
Example
/*******************************************************************************
* Copyright 2017 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:
ippsEncodeLZOGetSize
ippsEncodeLZO_8u
ippsEncodeLZOInit_8u
ippsDecodeLZO_8u
ippsDecodeLZOSafe_8u
*/
#include <stdio.h>
#include <string.h>
#include <ipp/ippdc.h> /* Data compression functions */
#include <ipp/ipps.h> /* Malloc/vector initialization function */
/* 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 * 4)
#define DECOMPR_MAX (TEST_SIZE + 64)
int main(void)
{
Ipp8u *srcBuf = NULL, *comprBuf = NULL, *decomprBuf = NULL;
IppStatus st;
int i;
Ipp32u stateSize;
IppLZOState_8u *lzoState = NULL;
Ipp32u comprLen, decomprLen;
/* Allocate buffers */
srcBuf = ippsMalloc_8u(TEST_SIZE);
decomprBuf = ippsMalloc_8u(DECOMPR_MAX); /* Extra 64 bytes may be required
for non-safe decompression */
comprBuf = ippsMalloc_8u(TEST_SIZE + TEST_SIZE/10);
/* 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 */
/* Allocate and initialize LZO structure */
check_sts( st = ippsEncodeLZOGetSize(IppLZO1XST, TEST_SIZE, &stateSize) )
lzoState = (IppLZOState_8u*)ippsMalloc_8u(stateSize);
check_sts( st = ippsEncodeLZOInit_8u(IppLZO1XST, TEST_SIZE, lzoState) )
/* LZO compress, decompress and compare */
comprLen = (TEST_SIZE + TEST_SIZE/10);
check_sts( st = ippsEncodeLZO_8u(srcBuf, TEST_SIZE, comprBuf, &comprLen, lzoState) )
printf("LZO compress: %d bytes compressed into %d bytes\n", TEST_SIZE, (int)comprLen);
decomprLen = DECOMPR_MAX;
check_sts( st = ippsDecodeLZO_8u(comprBuf, comprLen, decomprBuf, &decomprLen) )
if(decomprLen != TEST_SIZE || memcmp(decomprBuf, srcBuf, TEST_SIZE) != 0)
{
printf("Non-safe decompress failed!\n");
st = ippStsErr;
goto exitLine;
}
else
printf("Non-safe decompress verified.\n");
/* Decompress using safe function */
ippsZero_8u(decomprBuf, DECOMPR_MAX);
decomprLen = TEST_SIZE; /* Can specify exact size */
check_sts( st = ippsDecodeLZOSafe_8u(comprBuf, comprLen, decomprBuf, &decomprLen) )
if(decomprLen != TEST_SIZE || memcmp(decomprBuf, srcBuf, TEST_SIZE) != 0)
{
printf("Safe decompress failed!\n");
st = ippStsErr;
goto exitLine;
}
else
printf("Safe decompress verified.\n");
EXIT_MAIN
ippsFree(srcBuf);
ippsFree(decomprBuf);
ippsFree(comprBuf);
ippsFree(lzoState);
return (int)st;
}