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minor variable isolation

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This commit is contained in:
Yann Collet 2016-04-01 15:48:48 +02:00
parent 9bb87e5995
commit 27caf2afca
7 changed files with 614 additions and 130 deletions
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77
lib/zbuff.c
View File

@ -128,18 +128,14 @@ size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc,
const void* dict, size_t dictSize,
ZSTD_parameters params, U64 pledgedSrcSize)
{
size_t neededInBuffSize;
ZSTD_adjustCParams(&params.cParams, pledgedSrcSize, dictSize);
neededInBuffSize = (size_t)1 << params.cParams.windowLog;
/* allocate buffers */
if (zbc->inBuffSize < neededInBuffSize) {
zbc->inBuffSize = neededInBuffSize;
free(zbc->inBuff); /* should not be necessary */
zbc->inBuff = (char*)malloc(neededInBuffSize);
if (zbc->inBuff == NULL) return ERROR(memory_allocation);
}
{ size_t const neededInBuffSize = (size_t)1 << params.cParams.windowLog;
if (zbc->inBuffSize < neededInBuffSize) {
zbc->inBuffSize = neededInBuffSize;
free(zbc->inBuff); /* should not be necessary */
zbc->inBuff = (char*)malloc(neededInBuffSize);
if (zbc->inBuff == NULL) return ERROR(memory_allocation);
} }
zbc->blockSize = MIN(ZSTD_BLOCKSIZE_MAX, zbc->inBuffSize);
if (zbc->outBuffSize < ZSTD_compressBound(zbc->blockSize)+1) {
zbc->outBuffSize = ZSTD_compressBound(zbc->blockSize)+1;
@ -148,23 +144,24 @@ size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc,
if (zbc->outBuff == NULL) return ERROR(memory_allocation);
}
zbc->outBuffContentSize = ZSTD_compressBegin_advanced(zbc->zc, dict, dictSize, params, pledgedSrcSize);
if (ZSTD_isError(zbc->outBuffContentSize)) return zbc->outBuffContentSize;
{ size_t const errorCode = ZSTD_compressBegin_advanced(zbc->zc, dict, dictSize, params, pledgedSrcSize);
if (ZSTD_isError(errorCode)) return errorCode; }
zbc->inToCompress = 0;
zbc->inBuffPos = 0;
zbc->inBuffTarget = zbc->blockSize;
zbc->outBuffFlushedSize = 0;
zbc->stage = ZBUFFcs_flush; /* starts by flushing the header */
zbc->stage = ZBUFFcs_load;
return 0; /* ready to go */
}
ZSTDLIB_API size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* zbc, const void* dict, size_t dictSize, int compressionLevel)
size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* zbc, const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_parameters params;
params.cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
params.fParams.contentSizeFlag = 0;
ZSTD_adjustCParams(&params.cParams, 0, dictSize);
return ZBUFF_compressInit_advanced(zbc, dict, dictSize, params, 0);
}
@ -190,11 +187,11 @@ static size_t ZBUFF_compressContinue_generic(ZBUFF_CCtx* zbc,
{
U32 notDone = 1;
const char* const istart = (const char*)src;
const char* ip = istart;
const char* const iend = istart + *srcSizePtr;
const char* ip = istart;
char* const ostart = (char*)dst;
char* op = ostart;
char* const oend = ostart + *dstCapacityPtr;
char* op = ostart;
while (notDone) {
switch(zbc->stage)
@ -203,19 +200,17 @@ static size_t ZBUFF_compressContinue_generic(ZBUFF_CCtx* zbc,
case ZBUFFcs_load:
/* complete inBuffer */
{
size_t toLoad = zbc->inBuffTarget - zbc->inBuffPos;
size_t loaded = ZBUFF_limitCopy(zbc->inBuff + zbc->inBuffPos, toLoad, ip, iend-ip);
{ size_t const toLoad = zbc->inBuffTarget - zbc->inBuffPos;
size_t const loaded = ZBUFF_limitCopy(zbc->inBuff + zbc->inBuffPos, toLoad, ip, iend-ip);
zbc->inBuffPos += loaded;
ip += loaded;
if ( (zbc->inBuffPos==zbc->inToCompress) || (!flush && (toLoad != loaded)) ) {
notDone = 0; break; /* not enough input to get a full block : stop there, wait for more */
} }
/* compress current block (note : this stage cannot be stopped in the middle) */
{
void* cDst;
{ void* cDst;
size_t cSize;
size_t iSize = zbc->inBuffPos - zbc->inToCompress;
size_t const iSize = zbc->inBuffPos - zbc->inToCompress;
size_t oSize = oend-op;
if (oSize >= ZSTD_compressBound(iSize))
cDst = op; /* compress directly into output buffer (avoid flush stage) */
@ -231,15 +226,13 @@ static size_t ZBUFF_compressContinue_generic(ZBUFF_CCtx* zbc,
if (cDst == op) { op += cSize; break; } /* no need to flush */
zbc->outBuffContentSize = cSize;
zbc->outBuffFlushedSize = 0;
zbc->stage = ZBUFFcs_flush;
// break; /* flush stage follows */
zbc->stage = ZBUFFcs_flush; /* continue to flush stage */
}
case ZBUFFcs_flush:
/* flush into dst */
{
size_t toFlush = zbc->outBuffContentSize - zbc->outBuffFlushedSize;
size_t flushed = ZBUFF_limitCopy(op, oend-op, zbc->outBuff + zbc->outBuffFlushedSize, toFlush);
{ size_t const toFlush = zbc->outBuffContentSize - zbc->outBuffFlushedSize;
size_t const flushed = ZBUFF_limitCopy(op, oend-op, zbc->outBuff + zbc->outBuffFlushedSize, toFlush);
op += flushed;
zbc->outBuffFlushedSize += flushed;
if (toFlush!=flushed) { notDone = 0; break; } /* not enough space within dst to store compressed block : stop there */
@ -255,8 +248,7 @@ static size_t ZBUFF_compressContinue_generic(ZBUFF_CCtx* zbc,
*srcSizePtr = ip - istart;
*dstCapacityPtr = op - ostart;
{
size_t hintInSize = zbc->inBuffTarget - zbc->inBuffPos;
{ size_t hintInSize = zbc->inBuffTarget - zbc->inBuffPos;
if (hintInSize==0) hintInSize = zbc->blockSize;
return hintInSize;
}
@ -276,7 +268,7 @@ size_t ZBUFF_compressContinue(ZBUFF_CCtx* zbc,
size_t ZBUFF_compressFlush(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr)
{
size_t srcSize = 0;
ZBUFF_compressContinue_generic(zbc, dst, dstCapacityPtr, &srcSize, &srcSize, 1); /* use a valid src address instead of NULL, as some sanitizer don't like it */
ZBUFF_compressContinue_generic(zbc, dst, dstCapacityPtr, &srcSize, &srcSize, 1); /* use a valid src address instead of NULL */
return zbc->outBuffContentSize - zbc->outBuffFlushedSize;
}
@ -284,8 +276,8 @@ size_t ZBUFF_compressFlush(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr)
size_t ZBUFF_compressEnd(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr)
{
BYTE* const ostart = (BYTE*)dst;
BYTE* op = ostart;
BYTE* const oend = ostart + *dstCapacityPtr;
BYTE* op = ostart;
size_t outSize = *dstCapacityPtr;
size_t epilogueSize, remaining;
ZBUFF_compressFlush(zbc, dst, &outSize); /* flush any remaining inBuff */
@ -411,7 +403,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
return headerSize;
} }
/* Frame header provides buffer sizes */
/* Frame header instruct buffer sizes */
{ size_t const neededInSize = ZSTD_BLOCKSIZE_MAX; /* a block is never > ZSTD_BLOCKSIZE_MAX */
if (zbc->inBuffSize < neededInSize) {
free(zbc->inBuff);
@ -419,8 +411,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
zbc->inBuff = (char*)malloc(neededInSize);
if (zbc->inBuff == NULL) return ERROR(memory_allocation);
} }
{
size_t const neededOutSize = (size_t)1 << zbc->fParams.windowLog;
{ size_t const neededOutSize = (size_t)1 << zbc->fParams.windowLog;
if (zbc->outBuffSize < neededOutSize) {
free(zbc->outBuff);
zbc->outBuffSize = neededOutSize;
@ -430,8 +421,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
zbc->stage = ZBUFFds_read;
case ZBUFFds_read:
{
size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbc->zc);
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbc->zc);
if (neededInSize==0) { /* end of frame */
zbc->stage = ZBUFFds_init;
notDone = 0;
@ -454,8 +444,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
}
case ZBUFFds_load:
{
size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbc->zc);
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbc->zc);
size_t const toLoad = neededInSize - zbc->inPos; /* should always be <= remaining space within inBuff */
size_t loadedSize;
if (toLoad > zbc->inBuffSize - zbc->inPos) return ERROR(corruption_detected); /* should never happen */
@ -463,8 +452,8 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
ip += loadedSize;
zbc->inPos += loadedSize;
if (loadedSize < toLoad) { notDone = 0; break; } /* not enough input, wait for more */
{
size_t const decodedSize = ZSTD_decompressContinue(zbc->zc,
/* decode loaded input */
{ size_t const decodedSize = ZSTD_decompressContinue(zbc->zc,
zbc->outBuff + zbc->outStart, zbc->outBuffSize - zbc->outStart,
zbc->inBuff, neededInSize);
if (ZSTD_isError(decodedSize)) return decodedSize;
@ -475,8 +464,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
// break; /* ZBUFFds_flush follows */
} }
case ZBUFFds_flush:
{
size_t const toFlushSize = zbc->outEnd - zbc->outStart;
{ size_t const toFlushSize = zbc->outEnd - zbc->outStart;
size_t const flushedSize = ZBUFF_limitCopy(op, oend-op, zbc->outBuff + zbc->outStart, toFlushSize);
op += flushedSize;
zbc->outStart += flushedSize;
@ -496,8 +484,7 @@ size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbc,
/* result */
*srcSizePtr = ip-istart;
*dstCapacityPtr = op-ostart;
{
size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zbc->zc);
{ size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zbc->zc);
if (nextSrcSizeHint > ZSTD_blockHeaderSize) nextSrcSizeHint+= ZSTD_blockHeaderSize; /* get following block header too */
nextSrcSizeHint -= zbc->inPos; /* already loaded*/
return nextSrcSizeHint;

13
lib/zbuff.h
View File

@ -31,11 +31,6 @@
#ifndef ZSTD_BUFFERED_H
#define ZSTD_BUFFERED_H
/* The objects defined into this file should be considered experimental.
* They are not considered stable, as their prototype may change in the future.
* You can use them for tests, provide feedback, or if you can endure risk of future changes.
*/
#if defined (__cplusplus)
extern "C" {
#endif
@ -89,12 +84,12 @@ ZSTDLIB_API size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCap
* *srcSizePtr and *dstCapacityPtr can be any size.
* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr.
* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data.
* The content of @dst will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst .
* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst .
* @return : a hint to preferred nb of bytes to use as input for next function call (it's just a hint, to improve latency)
* or an error code, which can be tested using ZBUFF_isError().
*
* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush().
* The nb of bytes written into @dst will be reported into *dstCapacityPtr.
* The nb of bytes written into `dst` will be reported into *dstCapacityPtr.
* Note that the function cannot output more than *dstCapacityPtr,
* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small.
* @return : nb of bytes still present into internal buffer (0 if it's empty)
@ -139,13 +134,13 @@ ZSTDLIB_API size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx,
* *srcSizePtr and *dstCapacityPtr can be any size.
* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr.
* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again.
* The content of @dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change @dst.
* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`.
* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency),
* or 0 when a frame is completely decoded,
* or an error code, which can be tested using ZBUFF_isError().
*
* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize()
* output : ZBUFF_recommendedDOutSize==128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
* input : ZBUFF_recommendedDInSize == 128KB + 3;
* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
* *******************************************************************************/

36
lib/zstd_compress.c
View File

@ -208,7 +208,8 @@ size_t ZSTD_sizeofCCtx(ZSTD_compressionParameters cParams) /* hidden interface
return ccsize; }
}
/*! ZSTD_resetCCtx_advanced() :
note : 'params' is expected to be validated */
static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
ZSTD_parameters params)
{ /* note : params considered validated here */
@ -1200,8 +1201,8 @@ static void ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base);
/* check immediate repcode */
while (ip <= ilimit) {
U32 current2 = (U32)(ip-base);
const U32 repIndex2 = current2 - offset_2;
U32 const current2 = (U32)(ip-base);
U32 const repIndex2 = current2 - offset_2;
const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2;
if ( ((repIndex2 <= dictLimit-4) || (repIndex2 >= dictLimit))
&& (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
@ -2233,18 +2234,12 @@ static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx* zc, const void* dict, si
}
/*! ZSTD_compressBegin_advanced() :
/*! ZSTD_compressBegin_internal() :
* @return : 0, or an error code */
size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* zc,
static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* zc,
const void* dict, size_t dictSize,
ZSTD_parameters params, U64 pledgedSrcSize)
{
/* compression parameters verification and optimization */
{ size_t const errorCode = ZSTD_checkCParams_advanced(params.cParams, pledgedSrcSize);
if (ZSTD_isError(errorCode)) return errorCode; }
ZSTD_adjustCParams(&params.cParams, pledgedSrcSize, dictSize);
{ size_t const errorCode = ZSTD_resetCCtx_advanced(zc, params);
if (ZSTD_isError(errorCode)) return errorCode; }
@ -2272,13 +2267,28 @@ size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* zc,
}
/*! ZSTD_compressBegin_advanced() :
* @return : 0, or an error code */
size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* zc,
const void* dict, size_t dictSize,
ZSTD_parameters params, U64 pledgedSrcSize)
{
/* compression parameters verification and optimization */
{ size_t const errorCode = ZSTD_checkCParams_advanced(params.cParams, pledgedSrcSize);
if (ZSTD_isError(errorCode)) return errorCode; }
return ZSTD_compressBegin_internal(zc, dict, dictSize, params, pledgedSrcSize);
}
size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* zc, const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_parameters params;
params.cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
params.fParams.contentSizeFlag = 0;
ZSTD_adjustCParams(&params.cParams, 0, dictSize);
ZSTD_LOG_BLOCK("%p: ZSTD_compressBegin_usingDict compressionLevel=%d\n", zc->base, compressionLevel);
return ZSTD_compressBegin_advanced(zc, dict, dictSize, params, 0);
return ZSTD_compressBegin_internal(zc, dict, dictSize, params, 0);
}
size_t ZSTD_compressBegin(ZSTD_CCtx* zc, int compressionLevel)
@ -2342,7 +2352,7 @@ static size_t ZSTD_compress_internal (ZSTD_CCtx* ctx,
BYTE* op = ostart;
/* Init */
{ size_t const errorCode = ZSTD_compressBegin_advanced(ctx, dict, dictSize, params, srcSize);
{ size_t const errorCode = ZSTD_compressBegin_internal(ctx, dict, dictSize, params, srcSize);
if(ZSTD_isError(errorCode)) return errorCode; }
/* body (compression) */

519
programs/result Normal file
View File

@ -0,0 +1,519 @@
/*
bench.c - Demo module to benchmark open-source compression algorithms
Copyright (C) Yann Collet 2012-2015
GPL v2 License
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
You can contact the author at :
- zstd source repository : https://github.com/Cyan4973/zstd
- ztsd public forum : https://groups.google.com/forum/#!forum/lz4c
*/
/* **************************************
* Compiler Options
****************************************/
/* Disable some Visual warning messages */
#ifdef _MSC_VER
# define _CRT_SECURE_NO_WARNINGS /* fopen */
# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
#endif
/* Unix Large Files support (>4GB) */
#define _FILE_OFFSET_BITS 64
#if (defined(__sun__) && (!defined(__LP64__))) /* Sun Solaris 32-bits requires specific definitions */
# define _LARGEFILE_SOURCE
#elif ! defined(__LP64__) /* No point defining Large file for 64 bit */
# define _LARGEFILE64_SOURCE
#endif
/* *************************************
* Includes
***************************************/
#include <stdlib.h> /* malloc, free */
#include <string.h> /* memset */
#include <stdio.h> /* fprintf, fopen, ftello64 */
#include <sys/types.h> /* stat64 */
#include <sys/stat.h> /* stat64 */
#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC */
/* sleep : posix - windows - others */
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__)))
# include <unistd.h> /* sleep */
# include <sys/resource.h> /* setpriority */
# define BMK_sleep(s) sleep(s)
# define HIGH_PRIORITY setpriority(PRIO_PROCESS, 0, -20)
#elif defined(_WIN32)
# include <windows.h>
# define BMK_sleep(s) Sleep(1000*s)
# define HIGH_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
#else
# define BMK_sleep(s) /* disabled */
# define HIGH_PRIORITY
#endif
#include "mem.h"
#include "zstd_static.h"
#include "xxhash.h"
#include "datagen.h" /* RDG_genBuffer */
/* *************************************
* Compiler specifics
***************************************/
#if !defined(S_ISREG)
# define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
#endif
#ifdef _MSC_VER
#define snprintf sprintf_s
#endif
/* *************************************
* Constants
***************************************/
#define NBLOOPS 3
#define TIMELOOP_S 1
#define ACTIVEPERIOD_S 70
#define COOLPERIOD_S 10
#define KB *(1 <<10)
#define MB *(1 <<20)
#define GB *(1U<<30)
static const size_t maxMemory = (sizeof(size_t)==4) ? (2 GB - 64 MB) : (size_t)(1ULL << ((sizeof(size_t)*8)-31));
#define DEFAULT_CHUNKSIZE (4 MB)
static U32 g_compressibilityDefault = 50;
/* *************************************
* console display
***************************************/
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); }
static U32 g_displayLevel = 2; /* 0 : no display; 1: errors; 2 : + result + interaction + warnings; 3 : + progression; 4 : + information */
/* *************************************
* Exceptions
***************************************/
#ifndef DEBUG
# define DEBUG 0
#endif
#define DEBUGOUTPUT(...) if (DEBUG) DISPLAY(__VA_ARGS__);
#define EXM_THROW(error, ...) \
{ \
DEBUGOUTPUT("Error defined at %s, line %i : \n", __FILE__, __LINE__); \
DISPLAYLEVEL(1, "Error %i : ", error); \
DISPLAYLEVEL(1, __VA_ARGS__); \
DISPLAYLEVEL(1, "\n"); \
exit(error); \
}
/* *************************************
* Benchmark Parameters
***************************************/
static U32 g_nbIterations = NBLOOPS;
static size_t g_blockSize = 0;
void BMK_SetNbIterations(unsigned nbLoops)
{
g_nbIterations = nbLoops;
DISPLAY("- %i iterations -\n", g_nbIterations);
}
void BMK_SetBlockSize(size_t blockSize)
{
g_blockSize = blockSize;
DISPLAY("using blocks of size %u KB \n", (U32)(blockSize>>10));
}
/* ********************************************************
* Private functions
**********************************************************/
static clock_t BMK_clockSpan( clock_t clockStart )
{
return clock() - clockStart; /* works even if overflow, span limited to <= ~30mn */
}
static U64 BMK_getFileSize(const char* infilename)
{
int r;
#if defined(_MSC_VER)
struct _stat64 statbuf;
r = _stat64(infilename, &statbuf);
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
#endif
if (r || !S_ISREG(statbuf.st_mode)) return 0; /* No good... */
return (U64)statbuf.st_size;
}
/* ********************************************************
* Bench functions
**********************************************************/
typedef struct
{
const char* srcPtr;
size_t srcSize;
char* cPtr;
size_t cRoom;
size_t cSize;
char* resPtr;
size_t resSize;
} blockParam_t;
#define MIN(a,b) ((a)<(b) ? (a) : (b))
#define MAX(a,b) ((a)>(b) ? (a) : (b))
static int BMK_benchMem(const void* srcBuffer, size_t srcSize,
const char* displayName, int cLevel,
const size_t* fileSizes, U32 nbFiles,
const void* dictBuffer, size_t dictBufferSize)
{
size_t const blockSize = (g_blockSize ? g_blockSize : srcSize) + (!srcSize); /* avoid div by 0 */
U32 const maxNbBlocks = (U32) ((srcSize + (blockSize-1)) / blockSize) + nbFiles;
blockParam_t* const blockTable = (blockParam_t*) malloc(maxNbBlocks * sizeof(blockParam_t));
size_t const maxCompressedSize = ZSTD_compressBound(srcSize) + (maxNbBlocks * 1024); /* add some room for safety */
void* const compressedBuffer = malloc(maxCompressedSize);
void* const resultBuffer = malloc(srcSize);
ZSTD_CCtx* refCtx = ZSTD_createCCtx();
ZSTD_CCtx* ctx = ZSTD_createCCtx();
ZSTD_DCtx* refDCtx = ZSTD_createDCtx();
ZSTD_DCtx* dctx = ZSTD_createDCtx();
U32 nbBlocks;
/* checks */
if (!compressedBuffer || !resultBuffer || !blockTable || !refCtx || !ctx || !refDCtx || !dctx)
EXM_THROW(31, "not enough memory");
/* init */
if (strlen(displayName)>17) displayName += strlen(displayName)-17; /* can only display 17 characters */
HIGH_PRIORITY;
/* Init blockTable data */
{ const char* srcPtr = (const char*)srcBuffer;
char* cPtr = (char*)compressedBuffer;
char* resPtr = (char*)resultBuffer;
U32 fileNb;
for (nbBlocks=0, fileNb=0; fileNb<nbFiles; fileNb++) {
size_t remaining = fileSizes[fileNb];
U32 const nbBlocksforThisFile = (U32)((remaining + (blockSize-1)) / blockSize);
U32 const blockEnd = nbBlocks + nbBlocksforThisFile;
for ( ; nbBlocks<blockEnd; nbBlocks++) {
size_t const thisBlockSize = MIN(remaining, blockSize);
blockTable[nbBlocks].srcPtr = srcPtr;
blockTable[nbBlocks].cPtr = cPtr;
blockTable[nbBlocks].resPtr = resPtr;
blockTable[nbBlocks].srcSize = thisBlockSize;
blockTable[nbBlocks].cRoom = ZSTD_compressBound(thisBlockSize);
srcPtr += thisBlockSize;
cPtr += blockTable[nbBlocks].cRoom;
resPtr += thisBlockSize;
remaining -= thisBlockSize;
} } }
/* warmimg up memory */
RDG_genBuffer(compressedBuffer, maxCompressedSize, 0.10, 0.50, 1);
/* Bench */
{ double fastestC = 100000000., fastestD = 100000000.;
U64 const crcOrig = XXH64(srcBuffer, srcSize, 0);
clock_t coolTime = clock();
U32 testNb;
DISPLAY("\r%79s\r", "");
for (testNb = 1; testNb <= (g_nbIterations + !g_nbIterations); testNb++) {
size_t cSize;
double ratio = 0.;
clock_t clockStart;
clock_t const clockLoop = g_nbIterations ? TIMELOOP_S * CLOCKS_PER_SEC : 10;
/* overheat protection */
if (BMK_clockSpan(coolTime) > ACTIVEPERIOD_S * CLOCKS_PER_SEC) {
DISPLAY("\rcooling down ... \r");
BMK_sleep(COOLPERIOD_S);
coolTime = clock();
}
/* Compression */
DISPLAY("%2i-%-17.17s :%10u ->\r", testNb, displayName, (U32)srcSize);
memset(compressedBuffer, 0xE5, maxCompressedSize); /* warm up and erase result buffer */
clockStart = clock();
while (clock() == clockStart);
clockStart = clock();
{ U32 nbLoops;
for (nbLoops = 0 ; BMK_clockSpan(clockStart) < clockLoop ; nbLoops++) {
U32 blockNb;
ZSTD_compressBegin_usingDict(refCtx, dictBuffer, dictBufferSize, cLevel);
for (blockNb=0; blockNb<nbBlocks; blockNb++) {
size_t const rSize = ZSTD_compress_usingPreparedCCtx(ctx, refCtx,
blockTable[blockNb].cPtr, blockTable[blockNb].cRoom,
blockTable[blockNb].srcPtr,blockTable[blockNb].srcSize);
if (ZSTD_isError(rSize)) EXM_THROW(1, "ZSTD_compress_usingPreparedCCtx() failed : %s", ZSTD_getErrorName(rSize));
blockTable[blockNb].cSize = rSize;
} }
{ clock_t const clockSpan = BMK_clockSpan(clockStart);
if ((double)clockSpan < fastestC*nbLoops) fastestC = (double)clockSpan / nbLoops;
} }
cSize = 0;
{ U32 blockNb; for (blockNb=0; blockNb<nbBlocks; blockNb++) cSize += blockTable[blockNb].cSize; }
ratio = (double)srcSize / (double)cSize;
DISPLAY("%2i-%-17.17s :%10u ->%10u (%5.3f),%6.1f MB/s\r",
testNb, displayName, (U32)srcSize, (U32)cSize, ratio,
(double)srcSize / 1000000. / (fastestC / CLOCKS_PER_SEC) );
(void)fastestD; (void)crcOrig; /* unused when decompression disabled */
#if 1
/* Decompression */
memset(resultBuffer, 0xD6, srcSize); /* warm result buffer */
clockStart = clock();
while (clock() == clockStart);
clockStart = clock();
{ U32 nbLoops;
for (nbLoops = 0 ; BMK_clockSpan(clockStart) < clockLoop ; nbLoops++) {
U32 blockNb;
ZSTD_decompressBegin_usingDict(refDCtx, dictBuffer, dictBufferSize);
for (blockNb=0; blockNb<nbBlocks; blockNb++) {
size_t const regenSize = ZSTD_decompress_usingPreparedDCtx(dctx, refDCtx,
blockTable[blockNb].resPtr, blockTable[blockNb].srcSize,
blockTable[blockNb].cPtr, blockTable[blockNb].cSize);
if (ZSTD_isError(regenSize)) {
DISPLAY("ZSTD_decompress_usingPreparedDCtx() failed on block %u : %s \n",
blockNb, ZSTD_getErrorName(regenSize));
clockStart -= clockLoop+1; /* force immediate test end */
break;
}
blockTable[blockNb].resSize = regenSize;
} }
{ clock_t const clockSpan = BMK_clockSpan(clockStart);
if ((double)clockSpan < fastestD*nbLoops) fastestD = (double)clockSpan / nbLoops;
} }
DISPLAY("%2i-%-17.17s :%10u ->%10u (%5.3f),%6.1f MB/s ,%6.1f MB/s\r",
testNb, displayName, (U32)srcSize, (U32)cSize, ratio,
(double)srcSize / 1000000. / (fastestC / CLOCKS_PER_SEC),
(double)srcSize / 1000000. / (fastestD / CLOCKS_PER_SEC) );
/* CRC Checking */
{ U64 const crcCheck = XXH64(resultBuffer, srcSize, 0);
if (crcOrig!=crcCheck) {
size_t u;
DISPLAY("!!! WARNING !!! %14s : Invalid Checksum : %x != %x \n", displayName, (unsigned)crcOrig, (unsigned)crcCheck);
for (u=0; u<srcSize; u++) {
if (((const BYTE*)srcBuffer)[u] != ((const BYTE*)resultBuffer)[u]) {
U32 segNb, bNb, pos;
size_t bacc = 0;
DISPLAY("Decoding error at pos %u ", (U32)u);
for (segNb = 0; segNb < nbBlocks; segNb++) {
if (bacc + blockTable[segNb].srcSize > u) break;
bacc += blockTable[segNb].srcSize;
}
pos = (U32)(u - bacc);
bNb = pos / (128 KB);
DISPLAY("(block %u, sub %u, pos %u) \n", segNb, bNb, pos);
break;
}
if (u==srcSize-1) { /* should never happen */
DISPLAY("no difference detected\n");
} }
break;
} } /* CRC Checking */
#endif
} /* for (testNb = 1; testNb <= (g_nbIterations + !g_nbIterations); testNb++) */
DISPLAY("%2i#\n", cLevel);
} /* Bench */
/* clean up */
free(compressedBuffer);
free(resultBuffer);
ZSTD_freeCCtx(refCtx);
ZSTD_freeCCtx(ctx);
ZSTD_freeDCtx(refDCtx);
ZSTD_freeDCtx(dctx);
return 0;
}
static size_t BMK_findMaxMem(U64 requiredMem)
{
size_t const step = 64 MB;
BYTE* testmem = NULL;
requiredMem = (((requiredMem >> 26) + 1) << 26);
requiredMem += step;
if (requiredMem > maxMemory) requiredMem = maxMemory;
do {
testmem = (BYTE*)malloc((size_t)requiredMem);
requiredMem -= step;
} while (!testmem);
free(testmem);
return (size_t)(requiredMem);
}
static void BMK_benchCLevel(void* srcBuffer, size_t benchedSize,
const char* displayName, int cLevel,
const size_t* fileSizes, unsigned nbFiles,
const void* dictBuffer, size_t dictBufferSize)
{
if (cLevel < 0) { /* range mode : test all levels from 1 to l */
int l;
for (l=1; l <= -cLevel; l++) {
BMK_benchMem(srcBuffer, benchedSize,
displayName, l,
fileSizes, nbFiles,
dictBuffer, dictBufferSize);
}
return;
}
BMK_benchMem(srcBuffer, benchedSize,
displayName, cLevel,
fileSizes, nbFiles,
dictBuffer, dictBufferSize);
}
static U64 BMK_getTotalFileSize(const char** fileNamesTable, unsigned nbFiles)
{
U64 total = 0;
unsigned n;
for (n=0; n<nbFiles; n++)
total += BMK_getFileSize(fileNamesTable[n]);
return total;
}
/*! BMK_loadFiles() :
Loads `buffer` with content of files listed within `fileNamesTable`.
At most, fills `buffer` entirely */
static void BMK_loadFiles(void* buffer, size_t bufferSize,
size_t* fileSizes,
const char** fileNamesTable, unsigned nbFiles)
{
size_t pos = 0;
unsigned n;
for (n=0; n<nbFiles; n++) {
U64 fileSize = BMK_getFileSize(fileNamesTable[n]);
FILE* const f = fopen(fileNamesTable[n], "rb");
if (f==NULL) EXM_THROW(10, "impossible to open file %s", fileNamesTable[n]);
DISPLAYLEVEL(2, "Loading %s... \r", fileNamesTable[n]);
if (fileSize > bufferSize-pos) fileSize = bufferSize-pos, nbFiles=n; /* buffer too small - stop after this file */
{ size_t const readSize = fread(((char*)buffer)+pos, 1, (size_t)fileSize, f);
if (readSize != (size_t)fileSize) EXM_THROW(11, "could not read %s", fileNamesTable[n]);
pos += readSize; }
fileSizes[n] = (size_t)fileSize;
fclose(f);
}
}
static void BMK_benchFileTable(const char** fileNamesTable, unsigned nbFiles,
const char* dictFileName, int cLevel)
{
void* srcBuffer;
size_t benchedSize;
void* dictBuffer = NULL;
size_t dictBufferSize = 0;
size_t* fileSizes = (size_t*)malloc(nbFiles * sizeof(size_t));
U64 totalSizeToLoad = BMK_getTotalFileSize(fileNamesTable, nbFiles);
char mfName[20] = {0};
const char* displayName = NULL;
if (!fileSizes) EXM_THROW(12, "not enough memory for fileSizes");
/* Load dictionary */
if (dictFileName != NULL) {
U64 dictFileSize = BMK_getFileSize(dictFileName);
if (dictFileSize > 64 MB) EXM_THROW(10, "dictionary file %s too large", dictFileName);
dictBufferSize = (size_t)dictFileSize;
dictBuffer = malloc(dictBufferSize);
if (dictBuffer==NULL) EXM_THROW(11, "not enough memory for dictionary (%u bytes)", (U32)dictBufferSize);
BMK_loadFiles(dictBuffer, dictBufferSize, fileSizes, &dictFileName, 1);
}
/* Memory allocation & restrictions */
benchedSize = BMK_findMaxMem(totalSizeToLoad * 3) / 3;
if ((U64)benchedSize > totalSizeToLoad) benchedSize = (size_t)totalSizeToLoad;
if (benchedSize < totalSizeToLoad)
DISPLAY("Not enough memory; testing %u MB only...\n", (U32)(benchedSize >> 20));
srcBuffer = malloc(benchedSize);
if (!srcBuffer) EXM_THROW(12, "not enough memory");
/* Load input buffer */
BMK_loadFiles(srcBuffer, benchedSize, fileSizes, fileNamesTable, nbFiles);
/* Bench */
snprintf (mfName, sizeof(mfName), " %u files", nbFiles);
if (nbFiles > 1) displayName = mfName;
else displayName = fileNamesTable[0];
BMK_benchCLevel(srcBuffer, benchedSize,
displayName, cLevel,
fileSizes, nbFiles,
dictBuffer, dictBufferSize);
/* clean up */
free(srcBuffer);
free(dictBuffer);
free(fileSizes);
}
static void BMK_syntheticTest(int cLevel, double compressibility)
{
char name[20] = {0};
size_t benchedSize = 10000000;
void* srcBuffer = malloc(benchedSize);
/* Memory allocation */
if (!srcBuffer) EXM_THROW(21, "not enough memory");
/* Fill input buffer */
RDG_genBuffer(srcBuffer, benchedSize, compressibility, 0.0, 0);
/* Bench */
snprintf (name, sizeof(name), "Synthetic %2u%%", (unsigned)(compressibility*100));
BMK_benchCLevel(srcBuffer, benchedSize, name, cLevel, &benchedSize, 1, NULL, 0);
/* clean up */
free(srcBuffer);
}
int BMK_benchFiles(const char** fileNamesTable, unsigned nbFiles,
const char* dictFileName, int cLevel)
{
double const compressibility = (double)g_compressibilityDefault / 100;
if (nbFiles == 0)
BMK_syntheticTest(cLevel, compressibility);
else
BMK_benchFileTable(fileNamesTable, nbFiles, dictFileName, cLevel);
return 0;
}

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99
programs/zbufftest.c
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@ -1,6 +1,6 @@
/*
Fuzzer test tool for zstd_buffered
Copyright (C) Yann Collet 2105
Copyright (C) Yann Collet 2015-2016
GPL v2 License
@ -19,11 +19,10 @@
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
You can contact the author at :
- ZSTD source repository : https://github.com/Cyan4973/zstd
- ZSTD public forum : https://groups.google.com/forum/#!forum/lz4c
- ZSTD homepage : https://www.zstd.net/
*/
/**************************************
/*-************************************
* Compiler specific
**************************************/
#ifdef _MSC_VER /* Visual Studio */
@ -33,7 +32,7 @@
#endif
/**************************************
/*-************************************
* Includes
**************************************/
#include <stdlib.h> /* free */
@ -47,8 +46,8 @@
#include "xxhash.h" /* XXH64 */
/**************************************
Constants
/*-************************************
* Constants
**************************************/
#ifndef ZSTD_VERSION
# define ZSTD_VERSION ""
@ -66,7 +65,7 @@ static const U32 prime2 = 2246822519U;
/**************************************
/*-************************************
* Display Macros
**************************************/
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
@ -83,7 +82,7 @@ static U32 g_displayTime = 0;
static U32 g_testTime = 0;
/*********************************************************
/*-*******************************************************
* Fuzzer functions
*********************************************************/
#define MAX(a,b) ((a)>(b)?(a):(b))
@ -149,8 +148,7 @@ static int basicUnitTests(U32 seed, double compressibility)
CNBuffer = malloc(CNBufferSize);
compressedBuffer = malloc(compressedBufferSize);
decodedBuffer = malloc(decodedBufferSize);
if (!CNBuffer || !compressedBuffer || !decodedBuffer || !zc || !zd)
{
if (!CNBuffer || !compressedBuffer || !decodedBuffer || !zc || !zd) {
DISPLAY("Not enough memory, aborting\n");
goto _output_error;
}
@ -183,11 +181,9 @@ static int basicUnitTests(U32 seed, double compressibility)
DISPLAYLEVEL(4, "OK \n");
/* check regenerated data is byte exact */
{
size_t i;
{ size_t i;
DISPLAYLEVEL(4, "test%3i : check decompressed result : ", testNb++);
for (i=0; i<CNBufferSize; i++)
{
for (i=0; i<CNBufferSize; i++) {
if (((BYTE*)decodedBuffer)[i] != ((BYTE*)CNBuffer)[i]) goto _output_error;;
}
DISPLAYLEVEL(4, "OK \n");
@ -213,8 +209,7 @@ static size_t findDiff(const void* buf1, const void* buf2, size_t max)
const BYTE* b1 = (const BYTE*)buf1;
const BYTE* b2 = (const BYTE*)buf2;
size_t i;
for (i=0; i<max; i++)
{
for (i=0; i<max; i++) {
if (b1[i] != b2[i]) break;
}
return i;
@ -228,7 +223,7 @@ static size_t findDiff(const void* buf1, const void* buf2, size_t max)
static const U32 maxSrcLog = 24;
static const U32 maxSampleLog = 19;
int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibility)
static int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibility)
{
BYTE* cNoiseBuffer[5];
BYTE* srcBuffer;
@ -276,8 +271,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
FUZ_rand(&coreSeed);
/* test loop */
for ( ; (testNb <= nbTests) || (FUZ_GetMilliSpan(startTime) < g_testTime); testNb++ )
{
for ( ; (testNb <= nbTests) || (FUZ_GetMilliSpan(startTime) < g_testTime); testNb++ ) {
size_t sampleSize, sampleStart;
const BYTE* dict;
size_t cSize, dictSize;
@ -294,20 +288,15 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
lseed = coreSeed ^ prime1;
buffNb = FUZ_rand(&lseed) & 127;
if (buffNb & 7) buffNb=2; /* select buffer */
else
{
else {
buffNb >>= 3;
if (buffNb & 7)
{
if (buffNb & 7) {
const U32 tnb[2] = { 1, 3 };
buffNb = tnb[buffNb >> 3];
}
else
{
} else {
const U32 tnb[2] = { 0, 4 };
buffNb = tnb[buffNb >> 3];
}
}
} }
srcBuffer = cNoiseBuffer[buffNb];
/* Multi - segments compression test */
@ -327,8 +316,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
totalTestSize = 0;
cSize = 0;
for (n=0; n<nbChunks; n++)
{
for (n=0; n<nbChunks; n++) {
sampleSizeLog = FUZ_rand(&lseed) % maxSampleLog;
sampleSize = (size_t)1 << sampleSizeLog;
sampleSize += FUZ_rand(&lseed) & (sampleSize-1);
@ -349,8 +337,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
cSize += genSize;
totalTestSize += readSize;
if ((FUZ_rand(&lseed) & 15) == 0)
{
if ((FUZ_rand(&lseed) & 15) == 0) {
/* add a few random flushes operations, to mess around */
sampleSizeLog = FUZ_rand(&lseed) % maxSampleLog;
sampleSize = (size_t)1 << sampleSizeLog;
@ -374,8 +361,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
ZBUFF_decompressInitDictionary(zd, dict, dictSize);
totalCSize = 0;
totalGenSize = 0;
while (totalCSize < cSize)
{
while (totalCSize < cSize) {
sampleSizeLog = FUZ_rand(&lseed) % maxSampleLog;
sampleSize = (size_t)1 << sampleSizeLog;
sampleSize += FUZ_rand(&lseed) & (sampleSize-1);
@ -399,8 +385,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
/* noisy/erroneous src decompression test */
/* add some noise */
nbChunks = (FUZ_rand(&lseed) & 7) + 2;
for (n=0; n<nbChunks; n++)
{
for (n=0; n<nbChunks; n++) {
size_t cStart;
sampleSizeLog = FUZ_rand(&lseed) % maxSampleLog;
@ -417,8 +402,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
ZBUFF_decompressInit(zd);
totalCSize = 0;
totalGenSize = 0;
while ( (totalCSize < cSize) && (totalGenSize < dstBufferSize) )
{
while ( (totalCSize < cSize) && (totalGenSize < dstBufferSize) ) {
sampleSizeLog = FUZ_rand(&lseed) % maxSampleLog;
sampleSize = (size_t)1 << sampleSizeLog;
sampleSize += FUZ_rand(&lseed) & (sampleSize-1);
@ -431,8 +415,7 @@ int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compressibilit
if (ZBUFF_isError(errorCode)) break; /* error correctly detected */
totalGenSize += genSize;
totalCSize += readSize;
}
}
} }
DISPLAY("\r%u fuzzer tests completed \n", testNb);
_cleanup:
@ -454,7 +437,7 @@ _output_error:
}
/*********************************************************
/*-*******************************************************
* Command line
*********************************************************/
int FUZ_usage(char* programName)
@ -488,19 +471,16 @@ int main(int argc, char** argv)
/* Check command line */
programName = argv[0];
for(argNb=1; argNb<argc; argNb++)
{
for(argNb=1; argNb<argc; argNb++) {
char* argument = argv[argNb];
if(!argument) continue; /* Protection if argument empty */
/* Handle commands. Aggregated commands are allowed */
if (argument[0]=='-')
{
if (argument[0]=='-') {
argument++;
while (*argument!=0)
{
while (*argument!=0) {
switch(*argument)
{
case 'h':
@ -521,8 +501,7 @@ int main(int argc, char** argv)
case 'i':
argument++;
nbTests=0; g_testTime=0;
while ((*argument>='0') && (*argument<='9'))
{
while ((*argument>='0') && (*argument<='9')) {
nbTests *= 10;
nbTests += *argument - '0';
argument++;
@ -532,8 +511,7 @@ int main(int argc, char** argv)
case 'T':
argument++;
nbTests=0; g_testTime=0;
while ((*argument>='0') && (*argument<='9'))
{
while ((*argument>='0') && (*argument<='9')) {
g_testTime *= 10;
g_testTime += *argument - '0';
argument++;
@ -547,8 +525,7 @@ int main(int argc, char** argv)
argument++;
seed=0;
seedset=1;
while ((*argument>='0') && (*argument<='9'))
{
while ((*argument>='0') && (*argument<='9')) {
seed *= 10;
seed += *argument - '0';
argument++;
@ -558,8 +535,7 @@ int main(int argc, char** argv)
case 't':
argument++;
testNb=0;
while ((*argument>='0') && (*argument<='9'))
{
while ((*argument>='0') && (*argument<='9')) {
testNb *= 10;
testNb += *argument - '0';
argument++;
@ -569,8 +545,7 @@ int main(int argc, char** argv)
case 'P': /* compressibility % */
argument++;
proba=0;
while ((*argument>='0') && (*argument<='9'))
{
while ((*argument>='0') && (*argument<='9')) {
proba *= 10;
proba += *argument - '0';
argument++;
@ -582,9 +557,7 @@ int main(int argc, char** argv)
default:
return FUZ_usage(programName);
}
}
}
}
} } }
/* Get Seed */
DISPLAY("Starting zstd_buffered tester (%i-bits, %s)\n", (int)(sizeof(size_t)*8), ZSTD_VERSION);
@ -598,8 +571,8 @@ int main(int argc, char** argv)
if (testNb==0) result = basicUnitTests(0, ((double)proba) / 100); /* constant seed for predictability */
if (!result)
result = fuzzerTests(seed, nbTests, testNb, ((double)proba) / 100);
if (mainPause)
{
if (mainPause) {
int unused;
DISPLAY("Press Enter \n");
unused = getchar();