mirror of
https://github.com/facebook/zstd.git
synced 2025-11-04 00:02:59 -05:00
229 lines
8.4 KiB
C
229 lines
8.4 KiB
C
/**
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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/*-*************************************
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* Includes
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***************************************/
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#include "util.h" /* Compiler options, UTIL_GetFileSize, UTIL_getTotalFileSize */
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#include <stdlib.h> /* malloc, free */
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#include <string.h> /* memset */
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#include <stdio.h> /* fprintf, fopen, ftello64 */
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#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC */
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#include <errno.h> /* errno */
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#include "mem.h" /* read */
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#include "error_private.h"
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#include "dibio.h"
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/*-*************************************
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* Constants
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***************************************/
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#define KB *(1 <<10)
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#define MB *(1 <<20)
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#define GB *(1U<<30)
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#define MEMMULT 11
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static const size_t maxMemory = (sizeof(size_t) == 4) ? (2 GB - 64 MB) : ((size_t)(512 MB) << sizeof(size_t));
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#define NOISELENGTH 32
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/*-*************************************
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* Console display
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***************************************/
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#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
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#define DISPLAYLEVEL(l, ...) if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); }
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static unsigned g_displayLevel = 0; /* 0 : no display; 1: errors; 2: default; 4: full information */
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#define DISPLAYUPDATE(l, ...) if (g_displayLevel>=l) { \
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if ((DIB_clockSpan(g_time) > refreshRate) || (g_displayLevel>=4)) \
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{ g_time = clock(); DISPLAY(__VA_ARGS__); \
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if (g_displayLevel>=4) fflush(stdout); } }
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static const clock_t refreshRate = CLOCKS_PER_SEC * 2 / 10;
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static clock_t g_time = 0;
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static clock_t DIB_clockSpan(clock_t nPrevious) { return clock() - nPrevious; }
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/*-*************************************
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* Exceptions
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***************************************/
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#ifndef DEBUG
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# define DEBUG 0
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#endif
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#define DEBUGOUTPUT(...) if (DEBUG) DISPLAY(__VA_ARGS__);
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#define EXM_THROW(error, ...) \
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{ \
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DEBUGOUTPUT("Error defined at %s, line %i : \n", __FILE__, __LINE__); \
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DISPLAYLEVEL(1, "Error %i : ", error); \
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DISPLAYLEVEL(1, __VA_ARGS__); \
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DISPLAYLEVEL(1, "\n"); \
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exit(error); \
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}
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/* ********************************************************
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* Helper functions
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**********************************************************/
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unsigned DiB_isError(size_t errorCode) { return ERR_isError(errorCode); }
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const char* DiB_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); }
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#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
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/* ********************************************************
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* File related operations
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**********************************************************/
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/** DiB_loadFiles() :
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* @return : nb of files effectively loaded into `buffer` */
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static unsigned DiB_loadFiles(void* buffer, size_t* bufferSizePtr,
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size_t* fileSizes,
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const char** fileNamesTable, unsigned nbFiles)
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{
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char* const buff = (char*)buffer;
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size_t pos = 0;
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unsigned n;
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for (n=0; n<nbFiles; n++) {
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const char* const fileName = fileNamesTable[n];
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unsigned long long const fs64 = UTIL_getFileSize(fileName);
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size_t const fileSize = (size_t) MIN(fs64, 128 KB);
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if (fileSize > *bufferSizePtr-pos) break;
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{ FILE* const f = fopen(fileName, "rb");
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if (f==NULL) EXM_THROW(10, "zstd: dictBuilder: %s %s ", fileName, strerror(errno));
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DISPLAYUPDATE(2, "Loading %s... \r", fileName);
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{ size_t const readSize = fread(buff+pos, 1, fileSize, f);
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if (readSize != fileSize) EXM_THROW(11, "Pb reading %s", fileName);
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pos += readSize; }
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fileSizes[n] = fileSize;
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fclose(f);
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} }
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*bufferSizePtr = pos;
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return n;
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}
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/*-********************************************************
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* Dictionary training functions
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**********************************************************/
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static size_t DiB_findMaxMem(unsigned long long requiredMem)
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{
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size_t const step = 8 MB;
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void* testmem = NULL;
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requiredMem = (((requiredMem >> 23) + 1) << 23);
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requiredMem += step;
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if (requiredMem > maxMemory) requiredMem = maxMemory;
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while (!testmem) {
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testmem = malloc((size_t)requiredMem);
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requiredMem -= step;
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}
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free(testmem);
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return (size_t)requiredMem;
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}
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static void DiB_fillNoise(void* buffer, size_t length)
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{
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unsigned const prime1 = 2654435761U;
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unsigned const prime2 = 2246822519U;
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unsigned acc = prime1;
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size_t p=0;;
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for (p=0; p<length; p++) {
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acc *= prime2;
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((unsigned char*)buffer)[p] = (unsigned char)(acc >> 21);
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}
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}
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static void DiB_saveDict(const char* dictFileName,
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const void* buff, size_t buffSize)
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{
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FILE* const f = fopen(dictFileName, "wb");
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if (f==NULL) EXM_THROW(3, "cannot open %s ", dictFileName);
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{ size_t const n = fwrite(buff, 1, buffSize, f);
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if (n!=buffSize) EXM_THROW(4, "%s : write error", dictFileName) }
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{ size_t const n = (size_t)fclose(f);
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if (n!=0) EXM_THROW(5, "%s : flush error", dictFileName) }
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}
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/*! ZDICT_trainFromBuffer_unsafe() :
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Strictly Internal use only !!
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Same as ZDICT_trainFromBuffer_advanced(), but does not control `samplesBuffer`.
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`samplesBuffer` must be followed by noisy guard band to avoid out-of-buffer reads.
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@return : size of dictionary stored into `dictBuffer` (<= `dictBufferCapacity`)
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or an error code.
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*/
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size_t ZDICT_trainFromBuffer_unsafe(void* dictBuffer, size_t dictBufferCapacity,
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const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples,
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ZDICT_params_t parameters);
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int DiB_trainFromFiles(const char* dictFileName, unsigned maxDictSize,
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const char** fileNamesTable, unsigned nbFiles,
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ZDICT_params_t params)
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{
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void* const dictBuffer = malloc(maxDictSize);
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size_t* const fileSizes = (size_t*)malloc(nbFiles * sizeof(size_t));
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unsigned long long const totalSizeToLoad = UTIL_getTotalFileSize(fileNamesTable, nbFiles);
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size_t const maxMem = DiB_findMaxMem(totalSizeToLoad * MEMMULT) / MEMMULT;
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size_t benchedSize = MIN (maxMem, (size_t)totalSizeToLoad);
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void* const srcBuffer = malloc(benchedSize+NOISELENGTH);
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int result = 0;
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/* Checks */
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if ((!fileSizes) || (!srcBuffer) || (!dictBuffer)) EXM_THROW(12, "not enough memory for DiB_trainFiles"); /* should not happen */
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g_displayLevel = params.notificationLevel;
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if (nbFiles < 5) {
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DISPLAYLEVEL(2, "! Warning : nb of samples too low for proper processing ! \n");
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DISPLAYLEVEL(2, "! Please provide _one file per sample_. \n");
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DISPLAYLEVEL(2, "! Do not concatenate samples together into a single file, \n");
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DISPLAYLEVEL(2, "! as dictBuilder will be unable to find the beginning of each sample, \n");
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DISPLAYLEVEL(2, "! resulting in poor dictionary quality. \n");
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}
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/* init */
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if (benchedSize < totalSizeToLoad)
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DISPLAYLEVEL(1, "Not enough memory; training on %u MB only...\n", (unsigned)(benchedSize >> 20));
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/* Load input buffer */
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nbFiles = DiB_loadFiles(srcBuffer, &benchedSize, fileSizes, fileNamesTable, nbFiles);
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DiB_fillNoise((char*)srcBuffer + benchedSize, NOISELENGTH); /* guard band, for end of buffer condition */
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{ size_t const dictSize = ZDICT_trainFromBuffer_unsafe(dictBuffer, maxDictSize,
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srcBuffer, fileSizes, nbFiles,
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params);
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if (ZDICT_isError(dictSize)) {
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DISPLAYLEVEL(1, "dictionary training failed : %s \n", ZDICT_getErrorName(dictSize)); /* should not happen */
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result = 1;
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goto _cleanup;
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}
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/* save dict */
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DISPLAYLEVEL(2, "Save dictionary of size %u into file %s \n", (U32)dictSize, dictFileName);
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DiB_saveDict(dictFileName, dictBuffer, dictSize);
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}
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/* clean up */
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_cleanup:
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free(srcBuffer);
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free(dictBuffer);
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free(fileSizes);
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return result;
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}
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