EncodeLZOInit
EncodeLZOInit
Initializes LZO encoding structure.
Syntax
IppStatus ippsEncodeLZOInit_8u(IppLZOMethod
method
, Ipp32u
maxInputLen
, IppLZOState_8u*
pLZOState
);
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 "methodParameter").
- maxInputLen
- Specifies the maximum length of the input data buffer during compression operations. Not required for theIppLZO1XSTandIppLZO1X1STcompression methods.
- pLZOState
- Pointer to the LZO encoding structure.
Description
This function initializes the LZO encoding structure in the external buffer. Its size must be calculated by calling the function
ippsEncodeLZOGetSize
beforehand.The parameter
method
must be the same for both functions.Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error if the pointerpLZOStateisNULL.
- ippStsBadArgErrI
- ndicates an error if the parametermethodhas an illegal value.
Example
/*******************************************************************************
* Copyright 2017-2021 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:
ippsEncodeLZOGetSize
ippsEncodeLZO_8u
ippsEncodeLZOInit_8u
ippsDecodeLZO_8u
ippsDecodeLZOSafe_8u
*/
#include <stdio.h>
#include <string.h>
#include <ippdc.h> /* Data compression functions */
#include <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;
}