Visible to Intel only — GUID: GUID-EE0459B5-7CB3-493B-A014-8B512C42B726
Visible to Intel only — GUID: GUID-EE0459B5-7CB3-493B-A014-8B512C42B726
EncodeLZO
Compresses input data, returns the length of the compressed data.
Syntax
IppStatus ippsEncodeLZO_8u (const Ipp8u* pSrc, Ipp32u srcLen, Ipp8u* pDst, Ipp32u* pDstLen, IppLZOState_8u* pLZOState);
Include Files
ippdc.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
pSrc |
Pointer to the source buffer. |
srcLen |
Length of the source buffer. |
pDst |
Pointer to the destination buffer. |
pDstLen |
Pointer to the length of the destination buffer. |
pLZOState |
Pointer to the LZO state structure. |
Description
This function performs compression of the source data pSrc according to the method specified in the LZO state structure pLZOState. It must be previously initialized by the function ippsEncodeLZOInit.
Compressed data are stored in the pDst, the pointer pDstLen points to the number of elements in this buffer.
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 one of the specified pointers is NULL. |
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 Performance 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;
}