path: root/contrib/libs/zstd/programs/zstdcli.c

/* 
 * Copyright (c) Yann Collet, Facebook, Inc. 
 * All rights reserved. 
 * 
 * This source code is licensed under both the BSD-style license (found in the 
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found 
 * in the COPYING file in the root directory of this source tree). 
 * You may select, at your option, one of the above-listed licenses. 
 */ 
 
 
/*-************************************ 
*  Tuning parameters 
**************************************/ 
#ifndef ZSTDCLI_CLEVEL_DEFAULT 
#  define ZSTDCLI_CLEVEL_DEFAULT 3 
#endif 
 
#ifndef ZSTDCLI_CLEVEL_MAX 
#  define ZSTDCLI_CLEVEL_MAX 19   /* without using --ultra */ 
#endif 
 
#ifndef ZSTDCLI_NBTHREADS_DEFAULT 
#  define ZSTDCLI_NBTHREADS_DEFAULT 1 
#endif 
 
/*-************************************ 
*  Dependencies 
**************************************/ 
#include "platform.h" /* IS_CONSOLE, PLATFORM_POSIX_VERSION */ 
#include "util.h"     /* UTIL_HAS_CREATEFILELIST, UTIL_createFileList */ 
#include <stdlib.h>   /* getenv */ 
#include <string.h>   /* strcmp, strlen */ 
#include <stdio.h>    /* fprintf(), stdin, stdout, stderr */ 
#include <errno.h>    /* errno */ 
#include <assert.h>   /* assert */ 
 
#include "fileio.h"   /* stdinmark, stdoutmark, ZSTD_EXTENSION */ 
#ifndef ZSTD_NOBENCH 
#  include "benchzstd.h"  /* BMK_benchFiles */ 
#endif 
#ifndef ZSTD_NODICT 
#  include "dibio.h"  /* ZDICT_cover_params_t, DiB_trainFromFiles() */ 
#endif 
#ifndef ZSTD_NOTRACE 
#  include "zstdcli_trace.h" 
#endif 
#include "../lib/zstd.h"  /* ZSTD_VERSION_STRING, ZSTD_minCLevel, ZSTD_maxCLevel */ 
 
 
/*-************************************ 
*  Constants 
**************************************/ 
#define COMPRESSOR_NAME "zstd command line interface" 
#ifndef ZSTD_VERSION 
#  define ZSTD_VERSION "v" ZSTD_VERSION_STRING 
#endif 
#define AUTHOR "Yann Collet" 
#define WELCOME_MESSAGE "*** %s %i-bits %s, by %s ***\n", COMPRESSOR_NAME, (int)(sizeof(size_t)*8), ZSTD_VERSION, AUTHOR 
 
#define ZSTD_ZSTDMT "zstdmt" 
#define ZSTD_UNZSTD "unzstd" 
#define ZSTD_CAT "zstdcat" 
#define ZSTD_ZCAT "zcat" 
#define ZSTD_GZ "gzip" 
#define ZSTD_GUNZIP "gunzip" 
#define ZSTD_GZCAT "gzcat" 
#define ZSTD_LZMA "lzma" 
#define ZSTD_UNLZMA "unlzma" 
#define ZSTD_XZ "xz" 
#define ZSTD_UNXZ "unxz" 
#define ZSTD_LZ4 "lz4" 
#define ZSTD_UNLZ4 "unlz4" 
 
#define KB *(1 <<10) 
#define MB *(1 <<20) 
#define GB *(1U<<30) 
 
#define DISPLAY_LEVEL_DEFAULT 2 
 
static const char*    g_defaultDictName = "dictionary"; 
static const unsigned g_defaultMaxDictSize = 110 KB; 
static const int      g_defaultDictCLevel = 3; 
static const unsigned g_defaultSelectivityLevel = 9; 
static const unsigned g_defaultMaxWindowLog = 27; 
#define OVERLAP_LOG_DEFAULT 9999 
#define LDM_PARAM_DEFAULT 9999  /* Default for parameters where 0 is valid */ 
static U32 g_overlapLog = OVERLAP_LOG_DEFAULT; 
static U32 g_ldmHashLog = 0; 
static U32 g_ldmMinMatch = 0; 
static U32 g_ldmHashRateLog = LDM_PARAM_DEFAULT; 
static U32 g_ldmBucketSizeLog = LDM_PARAM_DEFAULT; 
 
 
#define DEFAULT_ACCEL 1 
 
typedef enum { cover, fastCover, legacy } dictType; 
 
/*-************************************ 
*  Display Macros 
**************************************/ 
#define DISPLAY_F(f, ...)    fprintf((f), __VA_ARGS__) 
#define DISPLAYOUT(...)      DISPLAY_F(stdout, __VA_ARGS__) 
#define DISPLAY(...)         DISPLAY_F(stderr, __VA_ARGS__) 
#define DISPLAYLEVEL(l, ...) { if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); } } 
static int g_displayLevel = DISPLAY_LEVEL_DEFAULT;   /* 0 : no display,  1: errors,  2 : + result + interaction + warnings,  3 : + progression,  4 : + information */ 
 
 
/*-************************************ 
*  Check Version (when CLI linked to dynamic library) 
**************************************/ 
 
/* Due to usage of experimental symbols and capabilities by the CLI, 
 * the CLI must be linked against a dynamic library of same version */ 
static void checkLibVersion(void) 
{ 
    if (strcmp(ZSTD_VERSION_STRING, ZSTD_versionString())) { 
        DISPLAYLEVEL(1, "Error : incorrect library version (expecting : %s ; actual : %s ) \n", 
                    ZSTD_VERSION_STRING, ZSTD_versionString()); 
        DISPLAYLEVEL(1, "Please update library to version %s, or use stand-alone zstd binary \n", 
                    ZSTD_VERSION_STRING); 
        exit(1); 
    } 
} 
 
 
/*-************************************ 
*  Command Line 
**************************************/ 
/* print help either in `stderr` or `stdout` depending on originating request 
 * error (badusage) => stderr 
 * help (usage_advanced) => stdout 
 */ 
static void usage(FILE* f, const char* programName) 
{ 
    DISPLAY_F(f, "Usage : \n"); 
    DISPLAY_F(f, "      %s [args] [FILE(s)] [-o file] \n", programName); 
    DISPLAY_F(f, "\n"); 
    DISPLAY_F(f, "FILE    : a filename \n"); 
    DISPLAY_F(f, "          with no FILE, or when FILE is - , read standard input\n"); 
    DISPLAY_F(f, "Arguments : \n"); 
#ifndef ZSTD_NOCOMPRESS 
    DISPLAY_F(f, " -#     : # compression level (1-%d, default: %d) \n", ZSTDCLI_CLEVEL_MAX, ZSTDCLI_CLEVEL_DEFAULT); 
#endif 
#ifndef ZSTD_NODECOMPRESS 
    DISPLAY_F(f, " -d     : decompression \n"); 
#endif 
    DISPLAY_F(f, " -D DICT: use DICT as Dictionary for compression or decompression \n"); 
    DISPLAY_F(f, " -o file: result stored into `file` (only 1 output file) \n"); 
    DISPLAY_F(f, " -f     : disable input and output checks. Allows overwriting existing files,\n"); 
    DISPLAY_F(f, "          input from console, output to stdout, operating on links,\n"); 
    DISPLAY_F(f, "          block devices, etc.\n"); 
    DISPLAY_F(f, "--rm    : remove source file(s) after successful de/compression \n"); 
    DISPLAY_F(f, " -k     : preserve source file(s) (default) \n"); 
    DISPLAY_F(f, " -h/-H  : display help/long help and exit \n"); 
} 
 
static void usage_advanced(const char* programName) 
{ 
    DISPLAYOUT(WELCOME_MESSAGE); 
    usage(stdout, programName); 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "Advanced arguments : \n"); 
    DISPLAYOUT( " -V     : display Version number and exit \n"); 
 
    DISPLAYOUT( " -c     : write to standard output (even if it is the console) \n");
 
    DISPLAYOUT( " -v     : verbose mode; specify multiple times to increase verbosity \n"); 
    DISPLAYOUT( " -q     : suppress warnings; specify twice to suppress errors too \n"); 
    DISPLAYOUT( "--[no-]progress : forcibly display, or never display the progress counter.\n"); 
    DISPLAYOUT( "                  note: any (de)compressed output to terminal will mix with progress counter text. \n"); 
 
#ifdef UTIL_HAS_CREATEFILELIST 
    DISPLAYOUT( " -r     : operate recursively on directories \n"); 
    DISPLAYOUT( "--filelist FILE : read list of files to operate upon from FILE \n"); 
    DISPLAYOUT( "--output-dir-flat DIR : processed files are stored into DIR \n"); 
#endif 
 
#ifdef UTIL_HAS_MIRRORFILELIST 
    DISPLAYOUT( "--output-dir-mirror DIR : processed files are stored into DIR respecting original directory structure \n"); 
#endif 
 
 
#ifndef ZSTD_NOCOMPRESS 
    DISPLAYOUT( "--[no-]check : during compression, add XXH64 integrity checksum to frame (default: enabled)"); 
#ifndef ZSTD_NODECOMPRESS 
    DISPLAYOUT( ". If specified with -d, decompressor will ignore/validate checksums in compressed frame (default: validate)."); 
#endif 
#else 
#ifdef ZSTD_NOCOMPRESS 
    DISPLAYOUT( "--[no-]check : during decompression, ignore/validate checksums in compressed frame (default: validate)."); 
#endif 
#endif /* ZSTD_NOCOMPRESS */ 
 
#ifndef ZSTD_NOTRACE 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "--trace FILE : log tracing information to FILE."); 
#endif 
    DISPLAYOUT( "\n"); 
 
    DISPLAYOUT( "--      : All arguments after \"--\" are treated as files \n"); 
 
#ifndef ZSTD_NOCOMPRESS 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "Advanced compression arguments : \n"); 
    DISPLAYOUT( "--ultra : enable levels beyond %i, up to %i (requires more memory) \n", ZSTDCLI_CLEVEL_MAX, ZSTD_maxCLevel()); 
    DISPLAYOUT( "--long[=#]: enable long distance matching with given window log (default: %u) \n", g_defaultMaxWindowLog); 
    DISPLAYOUT( "--fast[=#]: switch to very fast compression levels (default: %u) \n", 1); 
    DISPLAYOUT( "--adapt : dynamically adapt compression level to I/O conditions \n"); 
    DISPLAYOUT( "--[no-]row-match-finder : force enable/disable usage of fast row-based matchfinder for greedy, lazy, and lazy2 strategies \n"); 
    DISPLAYOUT( "--patch-from=FILE : specify the file to be used as a reference point for zstd's diff engine. \n");
# ifdef ZSTD_MULTITHREAD 
    DISPLAYOUT( " -T#    : spawns # compression threads (default: 1, 0==# cores) \n"); 
    DISPLAYOUT( " -B#    : select size of each job (default: 0==automatic) \n"); 
    DISPLAYOUT( "--single-thread : use a single thread for both I/O and compression (result slightly different than -T1) \n"); 
    DISPLAYOUT( "--auto-threads={physical,logical} (default: physical} : use either physical cores or logical cores as default when specifying -T0 \n");
    DISPLAYOUT( "--rsyncable : compress using a rsync-friendly method (-B sets block size) \n"); 
# endif 
    DISPLAYOUT( "--exclude-compressed: only compress files that are not already compressed \n"); 
    DISPLAYOUT( "--stream-size=# : specify size of streaming input from `stdin` \n"); 
    DISPLAYOUT( "--size-hint=# optimize compression parameters for streaming input of approximately this size \n"); 
    DISPLAYOUT( "--target-compressed-block-size=# : generate compressed block of approximately targeted size \n"); 
    DISPLAYOUT( "--no-dictID : don't write dictID into header (dictionary compression only) \n"); 
    DISPLAYOUT( "--[no-]compress-literals : force (un)compressed literals \n"); 
 
    DISPLAYOUT( "--format=zstd : compress files to the .zst format (default) \n"); 
#ifdef ZSTD_GZCOMPRESS 
    DISPLAYOUT( "--format=gzip : compress files to the .gz format \n"); 
#endif 
#ifdef ZSTD_LZMACOMPRESS 
    DISPLAYOUT( "--format=xz : compress files to the .xz format \n"); 
    DISPLAYOUT( "--format=lzma : compress files to the .lzma format \n"); 
#endif 
#ifdef ZSTD_LZ4COMPRESS 
    DISPLAYOUT( "--format=lz4 : compress files to the .lz4 format \n"); 
#endif 
#endif  /* !ZSTD_NOCOMPRESS */ 
 
#ifndef ZSTD_NODECOMPRESS 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "Advanced decompression arguments : \n"); 
    DISPLAYOUT( " -l     : print information about zstd compressed files \n"); 
    DISPLAYOUT( "--test  : test compressed file integrity \n"); 
    DISPLAYOUT( " -M#    : Set a memory usage limit for decompression \n"); 
# if ZSTD_SPARSE_DEFAULT 
    DISPLAYOUT( "--[no-]sparse : sparse mode (default: enabled on file, disabled on stdout) \n"); 
# else 
    DISPLAYOUT( "--[no-]sparse : sparse mode (default: disabled) \n"); 
# endif 
#endif  /* ZSTD_NODECOMPRESS */ 
 
#ifndef ZSTD_NODICT 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "Dictionary builder : \n"); 
    DISPLAYOUT( "--train ## : create a dictionary from a training set of files \n"); 
    DISPLAYOUT( "--train-cover[=k=#,d=#,steps=#,split=#,shrink[=#]] : use the cover algorithm with optional args \n"); 
    DISPLAYOUT( "--train-fastcover[=k=#,d=#,f=#,steps=#,split=#,accel=#,shrink[=#]] : use the fast cover algorithm with optional args \n"); 
    DISPLAYOUT( "--train-legacy[=s=#] : use the legacy algorithm with selectivity (default: %u) \n", g_defaultSelectivityLevel); 
    DISPLAYOUT( " -o DICT : DICT is dictionary name (default: %s) \n", g_defaultDictName); 
    DISPLAYOUT( "--maxdict=# : limit dictionary to specified size (default: %u) \n", g_defaultMaxDictSize); 
    DISPLAYOUT( "--dictID=# : force dictionary ID to specified value (default: random) \n"); 
#endif 
 
#ifndef ZSTD_NOBENCH 
    DISPLAYOUT( "\n"); 
    DISPLAYOUT( "Benchmark arguments : \n"); 
    DISPLAYOUT( " -b#    : benchmark file(s), using # compression level (default: %d) \n", ZSTDCLI_CLEVEL_DEFAULT); 
    DISPLAYOUT( " -e#    : test all compression levels successively from -b# to -e# (default: 1) \n"); 
    DISPLAYOUT( " -i#    : minimum evaluation time in seconds (default: 3s) \n"); 
    DISPLAYOUT( " -B#    : cut file into independent blocks of size # (default: no block) \n"); 
    DISPLAYOUT( " -S     : output one benchmark result per input file (default: consolidated result) \n"); 
    DISPLAYOUT( "--priority=rt : set process priority to real-time \n"); 
#endif 
 
} 
 
static void badusage(const char* programName) 
{ 
    DISPLAYLEVEL(1, "Incorrect parameters \n"); 
    if (g_displayLevel >= 2) usage(stderr, programName); 
} 
 
static void waitEnter(void) 
{ 
    int unused; 
    DISPLAY("Press enter to continue... \n"); 
    unused = getchar(); 
    (void)unused; 
} 
 
static const char* lastNameFromPath(const char* path) 
{ 
    const char* name = path; 
    if (strrchr(name, '/')) name = strrchr(name, '/') + 1; 
    if (strrchr(name, '\\')) name = strrchr(name, '\\') + 1; /* windows */ 
    return name; 
} 
 
/*! exeNameMatch() : 
    @return : a non-zero value if exeName matches test, excluding the extension 
   */ 
static int exeNameMatch(const char* exeName, const char* test) 
{ 
    return !strncmp(exeName, test, strlen(test)) && 
        (exeName[strlen(test)] == '\0' || exeName[strlen(test)] == '.'); 
} 
 
static void errorOut(const char* msg) 
{ 
    DISPLAY("%s \n", msg); exit(1); 
} 
 
/*! readU32FromCharChecked() : 
 * @return 0 if success, and store the result in *value. 
 *  allows and interprets K, KB, KiB, M, MB and MiB suffix. 
 *  Will also modify `*stringPtr`, advancing it to position where it stopped reading. 
 * @return 1 if an overflow error occurs */ 
static int readU32FromCharChecked(const char** stringPtr, unsigned* value) 
{ 
    unsigned result = 0; 
    while ((**stringPtr >='0') && (**stringPtr <='9')) { 
        unsigned const max = ((unsigned)(-1)) / 10; 
        unsigned last = result; 
        if (result > max) return 1; /* overflow error */ 
        result *= 10; 
        result += (unsigned)(**stringPtr - '0'); 
        if (result < last) return 1; /* overflow error */ 
        (*stringPtr)++ ; 
    } 
    if ((**stringPtr=='K') || (**stringPtr=='M')) { 
        unsigned const maxK = ((unsigned)(-1)) >> 10; 
        if (result > maxK) return 1; /* overflow error */ 
        result <<= 10; 
        if (**stringPtr=='M') { 
            if (result > maxK) return 1; /* overflow error */ 
            result <<= 10; 
        } 
        (*stringPtr)++;  /* skip `K` or `M` */ 
        if (**stringPtr=='i') (*stringPtr)++; 
        if (**stringPtr=='B') (*stringPtr)++; 
    } 
    *value = result; 
    return 0; 
} 
 
/*! readU32FromChar() : 
 * @return : unsigned integer value read from input in `char` format. 
 *  allows and interprets K, KB, KiB, M, MB and MiB suffix. 
 *  Will also modify `*stringPtr`, advancing it to position where it stopped reading. 
 *  Note : function will exit() program if digit sequence overflows */ 
static unsigned readU32FromChar(const char** stringPtr) { 
    static const char errorMsg[] = "error: numeric value overflows 32-bit unsigned int"; 
    unsigned result; 
    if (readU32FromCharChecked(stringPtr, &result)) { errorOut(errorMsg); } 
    return result; 
} 
 
/*! readIntFromChar() :
 * @return : signed integer value read from input in `char` format.
 *  allows and interprets K, KB, KiB, M, MB and MiB suffix.
 *  Will also modify `*stringPtr`, advancing it to position where it stopped reading.
 *  Note : function will exit() program if digit sequence overflows */
static int readIntFromChar(const char** stringPtr) {
    static const char errorMsg[] = "error: numeric value overflows 32-bit int";
    int sign = 1;
    unsigned result;
    if (**stringPtr=='-') {
        (*stringPtr)++;
        sign = -1;
    }
    if (readU32FromCharChecked(stringPtr, &result)) { errorOut(errorMsg); }
    return (int) result * sign;
}

/*! readSizeTFromCharChecked() : 
 * @return 0 if success, and store the result in *value. 
 *  allows and interprets K, KB, KiB, M, MB and MiB suffix. 
 *  Will also modify `*stringPtr`, advancing it to position where it stopped reading. 
 * @return 1 if an overflow error occurs */ 
static int readSizeTFromCharChecked(const char** stringPtr, size_t* value) 
{ 
    size_t result = 0; 
    while ((**stringPtr >='0') && (**stringPtr <='9')) { 
        size_t const max = ((size_t)(-1)) / 10; 
        size_t last = result; 
        if (result > max) return 1; /* overflow error */ 
        result *= 10; 
        result += (size_t)(**stringPtr - '0'); 
        if (result < last) return 1; /* overflow error */ 
        (*stringPtr)++ ; 
    } 
    if ((**stringPtr=='K') || (**stringPtr=='M')) { 
        size_t const maxK = ((size_t)(-1)) >> 10; 
        if (result > maxK) return 1; /* overflow error */ 
        result <<= 10; 
        if (**stringPtr=='M') { 
            if (result > maxK) return 1; /* overflow error */ 
            result <<= 10; 
        } 
        (*stringPtr)++;  /* skip `K` or `M` */ 
        if (**stringPtr=='i') (*stringPtr)++; 
        if (**stringPtr=='B') (*stringPtr)++; 
    } 
    *value = result; 
    return 0; 
} 
 
/*! readSizeTFromChar() : 
 * @return : size_t value read from input in `char` format. 
 *  allows and interprets K, KB, KiB, M, MB and MiB suffix. 
 *  Will also modify `*stringPtr`, advancing it to position where it stopped reading. 
 *  Note : function will exit() program if digit sequence overflows */ 
static size_t readSizeTFromChar(const char** stringPtr) { 
    static const char errorMsg[] = "error: numeric value overflows size_t"; 
    size_t result; 
    if (readSizeTFromCharChecked(stringPtr, &result)) { errorOut(errorMsg); } 
    return result; 
} 
 
/** longCommandWArg() : 
 *  check if *stringPtr is the same as longCommand. 
 *  If yes, @return 1 and advances *stringPtr to the position which immediately follows longCommand. 
 * @return 0 and doesn't modify *stringPtr otherwise. 
 */ 
static int longCommandWArg(const char** stringPtr, const char* longCommand) 
{ 
    size_t const comSize = strlen(longCommand); 
    int const result = !strncmp(*stringPtr, longCommand, comSize); 
    if (result) *stringPtr += comSize; 
    return result; 
} 
 
 
#ifndef ZSTD_NODICT 
 
static const unsigned kDefaultRegression = 1; 
/** 
 * parseCoverParameters() : 
 * reads cover parameters from *stringPtr (e.g. "--train-cover=k=48,d=8,steps=32") into *params 
 * @return 1 means that cover parameters were correct 
 * @return 0 in case of malformed parameters 
 */ 
static unsigned parseCoverParameters(const char* stringPtr, ZDICT_cover_params_t* params) 
{ 
    memset(params, 0, sizeof(*params)); 
    for (; ;) { 
        if (longCommandWArg(&stringPtr, "k=")) { params->k = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "d=")) { params->d = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "steps=")) { params->steps = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "split=")) { 
          unsigned splitPercentage = readU32FromChar(&stringPtr); 
          params->splitPoint = (double)splitPercentage / 100.0; 
          if (stringPtr[0]==',') { stringPtr++; continue; } else break; 
        } 
        if (longCommandWArg(&stringPtr, "shrink")) { 
          params->shrinkDictMaxRegression = kDefaultRegression; 
          params->shrinkDict = 1; 
          if (stringPtr[0]=='=') { 
            stringPtr++; 
            params->shrinkDictMaxRegression = readU32FromChar(&stringPtr); 
          } 
          if (stringPtr[0]==',') { 
            stringPtr++; 
            continue; 
          } 
          else break; 
        } 
        return 0; 
    } 
    if (stringPtr[0] != 0) return 0; 
    DISPLAYLEVEL(4, "cover: k=%u\nd=%u\nsteps=%u\nsplit=%u\nshrink%u\n", params->k, params->d, params->steps, (unsigned)(params->splitPoint * 100), params->shrinkDictMaxRegression); 
    return 1; 
} 
 
/** 
 * parseFastCoverParameters() : 
 * reads fastcover parameters from *stringPtr (e.g. "--train-fastcover=k=48,d=8,f=20,steps=32,accel=2") into *params 
 * @return 1 means that fastcover parameters were correct 
 * @return 0 in case of malformed parameters 
 */ 
static unsigned parseFastCoverParameters(const char* stringPtr, ZDICT_fastCover_params_t* params) 
{ 
    memset(params, 0, sizeof(*params)); 
    for (; ;) { 
        if (longCommandWArg(&stringPtr, "k=")) { params->k = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "d=")) { params->d = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "f=")) { params->f = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "steps=")) { params->steps = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "accel=")) { params->accel = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "split=")) { 
          unsigned splitPercentage = readU32FromChar(&stringPtr); 
          params->splitPoint = (double)splitPercentage / 100.0; 
          if (stringPtr[0]==',') { stringPtr++; continue; } else break; 
        } 
        if (longCommandWArg(&stringPtr, "shrink")) { 
          params->shrinkDictMaxRegression = kDefaultRegression; 
          params->shrinkDict = 1; 
          if (stringPtr[0]=='=') { 
            stringPtr++; 
            params->shrinkDictMaxRegression = readU32FromChar(&stringPtr); 
          } 
          if (stringPtr[0]==',') { 
            stringPtr++; 
            continue; 
          } 
          else break; 
        } 
        return 0; 
    } 
    if (stringPtr[0] != 0) return 0; 
    DISPLAYLEVEL(4, "cover: k=%u\nd=%u\nf=%u\nsteps=%u\nsplit=%u\naccel=%u\nshrink=%u\n", params->k, params->d, params->f, params->steps, (unsigned)(params->splitPoint * 100), params->accel, params->shrinkDictMaxRegression); 
    return 1; 
} 
 
/** 
 * parseLegacyParameters() : 
 * reads legacy dictionary builder parameters from *stringPtr (e.g. "--train-legacy=selectivity=8") into *selectivity 
 * @return 1 means that legacy dictionary builder parameters were correct 
 * @return 0 in case of malformed parameters 
 */ 
static unsigned parseLegacyParameters(const char* stringPtr, unsigned* selectivity) 
{ 
    if (!longCommandWArg(&stringPtr, "s=") && !longCommandWArg(&stringPtr, "selectivity=")) { return 0; } 
    *selectivity = readU32FromChar(&stringPtr); 
    if (stringPtr[0] != 0) return 0; 
    DISPLAYLEVEL(4, "legacy: selectivity=%u\n", *selectivity); 
    return 1; 
} 
 
static ZDICT_cover_params_t defaultCoverParams(void) 
{ 
    ZDICT_cover_params_t params; 
    memset(&params, 0, sizeof(params)); 
    params.d = 8; 
    params.steps = 4; 
    params.splitPoint = 1.0; 
    params.shrinkDict = 0; 
    params.shrinkDictMaxRegression = kDefaultRegression; 
    return params; 
} 
 
static ZDICT_fastCover_params_t defaultFastCoverParams(void) 
{ 
    ZDICT_fastCover_params_t params; 
    memset(&params, 0, sizeof(params)); 
    params.d = 8; 
    params.f = 20; 
    params.steps = 4; 
    params.splitPoint = 0.75; /* different from default splitPoint of cover */ 
    params.accel = DEFAULT_ACCEL; 
    params.shrinkDict = 0; 
    params.shrinkDictMaxRegression = kDefaultRegression; 
    return params; 
} 
#endif 
 
 
/** parseAdaptParameters() : 
 *  reads adapt parameters from *stringPtr (e.g. "--zstd=min=1,max=19) and store them into adaptMinPtr and adaptMaxPtr. 
 *  Both adaptMinPtr and adaptMaxPtr must be already allocated and correctly initialized. 
 *  There is no guarantee that any of these values will be updated. 
 *  @return 1 means that parsing was successful, 
 *  @return 0 in case of malformed parameters 
 */ 
static unsigned parseAdaptParameters(const char* stringPtr, int* adaptMinPtr, int* adaptMaxPtr) 
{ 
    for ( ; ;) { 
        if (longCommandWArg(&stringPtr, "min=")) { *adaptMinPtr = readIntFromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
        if (longCommandWArg(&stringPtr, "max=")) { *adaptMaxPtr = readIntFromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
        DISPLAYLEVEL(4, "invalid compression parameter \n"); 
        return 0; 
    } 
    if (stringPtr[0] != 0) return 0; /* check the end of string */ 
    if (*adaptMinPtr > *adaptMaxPtr) { 
        DISPLAYLEVEL(4, "incoherent adaptation limits \n"); 
        return 0; 
    } 
    return 1; 
} 
 
 
/** parseCompressionParameters() : 
 *  reads compression parameters from *stringPtr (e.g. "--zstd=wlog=23,clog=23,hlog=22,slog=6,mml=3,tlen=48,strat=6") into *params 
 *  @return 1 means that compression parameters were correct 
 *  @return 0 in case of malformed parameters 
 */ 
static unsigned parseCompressionParameters(const char* stringPtr, ZSTD_compressionParameters* params) 
{ 
    for ( ; ;) { 
        if (longCommandWArg(&stringPtr, "windowLog=") || longCommandWArg(&stringPtr, "wlog=")) { params->windowLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "chainLog=") || longCommandWArg(&stringPtr, "clog=")) { params->chainLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "hashLog=") || longCommandWArg(&stringPtr, "hlog=")) { params->hashLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "searchLog=") || longCommandWArg(&stringPtr, "slog=")) { params->searchLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "minMatch=") || longCommandWArg(&stringPtr, "mml=")) { params->minMatch = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "targetLength=") || longCommandWArg(&stringPtr, "tlen=")) { params->targetLength = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "strategy=") || longCommandWArg(&stringPtr, "strat=")) { params->strategy = (ZSTD_strategy)(readU32FromChar(&stringPtr)); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "overlapLog=") || longCommandWArg(&stringPtr, "ovlog=")) { g_overlapLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "ldmHashLog=") || longCommandWArg(&stringPtr, "lhlog=")) { g_ldmHashLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "ldmMinMatch=") || longCommandWArg(&stringPtr, "lmml=")) { g_ldmMinMatch = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "ldmBucketSizeLog=") || longCommandWArg(&stringPtr, "lblog=")) { g_ldmBucketSizeLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        if (longCommandWArg(&stringPtr, "ldmHashRateLog=") || longCommandWArg(&stringPtr, "lhrlog=")) { g_ldmHashRateLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; } 
        DISPLAYLEVEL(4, "invalid compression parameter \n"); 
        return 0; 
    } 
 
    DISPLAYLEVEL(4, "windowLog=%d, chainLog=%d, hashLog=%d, searchLog=%d \n", params->windowLog, params->chainLog, params->hashLog, params->searchLog); 
    DISPLAYLEVEL(4, "minMatch=%d, targetLength=%d, strategy=%d \n", params->minMatch, params->targetLength, params->strategy); 
    if (stringPtr[0] != 0) return 0; /* check the end of string */ 
    return 1; 
} 
 
static void printVersion(void) 
{ 
    if (g_displayLevel < DISPLAY_LEVEL_DEFAULT) { 
        DISPLAYOUT("%s\n", ZSTD_VERSION_STRING); 
        return; 
    } 
 
    DISPLAYOUT(WELCOME_MESSAGE); 
    if (g_displayLevel >= 3) { 
    /* format support */ 
        DISPLAYOUT("*** supports: zstd"); 
    #if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>0) && (ZSTD_LEGACY_SUPPORT<8) 
        DISPLAYOUT(", zstd legacy v0.%d+", ZSTD_LEGACY_SUPPORT); 
    #endif 
    #ifdef ZSTD_GZCOMPRESS 
        DISPLAYOUT(", gzip"); 
    #endif 
    #ifdef ZSTD_LZ4COMPRESS 
        DISPLAYOUT(", lz4"); 
    #endif 
    #ifdef ZSTD_LZMACOMPRESS 
        DISPLAYOUT(", lzma, xz "); 
    #endif 
        DISPLAYOUT("\n"); 
        if (g_displayLevel >= 4) { 
            /* posix support */ 
        #ifdef _POSIX_C_SOURCE 
            DISPLAYOUT("_POSIX_C_SOURCE defined: %ldL\n", (long) _POSIX_C_SOURCE); 
        #endif 
        #ifdef _POSIX_VERSION 
            DISPLAYOUT("_POSIX_VERSION defined: %ldL \n", (long) _POSIX_VERSION); 
        #endif 
        #ifdef PLATFORM_POSIX_VERSION 
            DISPLAYOUT("PLATFORM_POSIX_VERSION defined: %ldL\n", (long) PLATFORM_POSIX_VERSION); 
        #endif 
    }   } 
} 
 
#define ZSTD_NB_STRATEGIES 9
static const char* ZSTD_strategyMap[ZSTD_NB_STRATEGIES + 1] = { "", "ZSTD_fast",
                "ZSTD_dfast", "ZSTD_greedy", "ZSTD_lazy", "ZSTD_lazy2", "ZSTD_btlazy2",
                "ZSTD_btopt", "ZSTD_btultra", "ZSTD_btultra2"};

#ifndef ZSTD_NOCOMPRESS

static void printDefaultCParams(const char* filename, const char* dictFileName, int cLevel) {
    unsigned long long fileSize = UTIL_getFileSize(filename);
    const size_t dictSize = dictFileName != NULL ? (size_t)UTIL_getFileSize(dictFileName) : 0;
    const ZSTD_compressionParameters cParams = ZSTD_getCParams(cLevel, fileSize, dictSize);
    if (fileSize != UTIL_FILESIZE_UNKNOWN) DISPLAY("%s (%u bytes)\n", filename, (unsigned)fileSize);
    else DISPLAY("%s (src size unknown)\n", filename);
    DISPLAY(" - windowLog     : %u\n", cParams.windowLog);
    DISPLAY(" - chainLog      : %u\n", cParams.chainLog);
    DISPLAY(" - hashLog       : %u\n", cParams.hashLog);
    DISPLAY(" - searchLog     : %u\n", cParams.searchLog);
    DISPLAY(" - minMatch      : %u\n", cParams.minMatch);
    DISPLAY(" - targetLength  : %u\n", cParams.targetLength);
    assert(cParams.strategy < ZSTD_NB_STRATEGIES + 1);
    DISPLAY(" - strategy      : %s (%u)\n", ZSTD_strategyMap[(int)cParams.strategy], (unsigned)cParams.strategy);
}

static void printActualCParams(const char* filename, const char* dictFileName, int cLevel, const ZSTD_compressionParameters* cParams) {
    unsigned long long fileSize = UTIL_getFileSize(filename);
    const size_t dictSize = dictFileName != NULL ? (size_t)UTIL_getFileSize(dictFileName) : 0;
    ZSTD_compressionParameters actualCParams = ZSTD_getCParams(cLevel, fileSize, dictSize);
    assert(g_displayLevel >= 4);
    actualCParams.windowLog = cParams->windowLog == 0 ? actualCParams.windowLog : cParams->windowLog;
    actualCParams.chainLog = cParams->chainLog == 0 ? actualCParams.chainLog : cParams->chainLog;
    actualCParams.hashLog = cParams->hashLog == 0 ? actualCParams.hashLog : cParams->hashLog;
    actualCParams.searchLog = cParams->searchLog == 0 ? actualCParams.searchLog : cParams->searchLog;
    actualCParams.minMatch = cParams->minMatch == 0 ? actualCParams.minMatch : cParams->minMatch;
    actualCParams.targetLength = cParams->targetLength == 0 ? actualCParams.targetLength : cParams->targetLength;
    actualCParams.strategy = cParams->strategy == 0 ? actualCParams.strategy : cParams->strategy;
    DISPLAY("--zstd=wlog=%d,clog=%d,hlog=%d,slog=%d,mml=%d,tlen=%d,strat=%d\n",
            actualCParams.windowLog, actualCParams.chainLog, actualCParams.hashLog, actualCParams.searchLog,
            actualCParams.minMatch, actualCParams.targetLength, actualCParams.strategy);
}

#endif

/* Environment variables for parameter setting */ 
#define ENV_CLEVEL "ZSTD_CLEVEL" 
#define ENV_NBTHREADS "ZSTD_NBTHREADS"    /* takes lower precedence than directly specifying -T# in the CLI */ 
 
/* pick up environment variable */ 
static int init_cLevel(void) { 
    const char* const env = getenv(ENV_CLEVEL); 
    if (env != NULL) { 
        const char* ptr = env; 
        int sign = 1; 
        if (*ptr == '-') { 
            sign = -1; 
            ptr++; 
        } else if (*ptr == '+') { 
            ptr++; 
        } 
 
        if ((*ptr>='0') && (*ptr<='9')) { 
            unsigned absLevel; 
            if (readU32FromCharChecked(&ptr, &absLevel)) { 
                DISPLAYLEVEL(2, "Ignore environment variable setting %s=%s: numeric value too large \n", ENV_CLEVEL, env); 
                return ZSTDCLI_CLEVEL_DEFAULT; 
            } else if (*ptr == 0) { 
                return sign * (int)absLevel; 
        }   } 
 
        DISPLAYLEVEL(2, "Ignore environment variable setting %s=%s: not a valid integer value \n", ENV_CLEVEL, env); 
    } 
 
    return ZSTDCLI_CLEVEL_DEFAULT; 
} 
 
#ifdef ZSTD_MULTITHREAD 
static unsigned init_nbThreads(void) { 
    const char* const env = getenv(ENV_NBTHREADS); 
    if (env != NULL) { 
        const char* ptr = env; 
        if ((*ptr>='0') && (*ptr<='9')) { 
            unsigned nbThreads; 
            if (readU32FromCharChecked(&ptr, &nbThreads)) { 
                DISPLAYLEVEL(2, "Ignore environment variable setting %s=%s: numeric value too large \n", ENV_NBTHREADS, env); 
                return ZSTDCLI_NBTHREADS_DEFAULT; 
            } else if (*ptr == 0) { 
                return nbThreads; 
            } 
        } 
        DISPLAYLEVEL(2, "Ignore environment variable setting %s=%s: not a valid unsigned value \n", ENV_NBTHREADS, env); 
    } 
 
    return ZSTDCLI_NBTHREADS_DEFAULT; 
} 
#endif 
 
#define NEXT_FIELD(ptr) {         \ 
    if (*argument == '=') {       \ 
        ptr = ++argument;         \ 
        argument += strlen(ptr);  \ 
    } else {                      \ 
        argNb++;                  \ 
        if (argNb >= argCount) {  \ 
            DISPLAY("error: missing command argument \n"); \ 
            CLEAN_RETURN(1);      \ 
        }                         \ 
        ptr = argv[argNb];        \ 
        assert(ptr != NULL);      \ 
        if (ptr[0]=='-') {        \ 
            DISPLAY("error: command cannot be separated from its argument by another command \n"); \ 
            CLEAN_RETURN(1);      \ 
}   }   } 
 
#define NEXT_UINT32(val32) {      \ 
    const char* __nb;             \ 
    NEXT_FIELD(__nb);             \ 
    val32 = readU32FromChar(&__nb); \ 
} 
 
typedef enum { zom_compress, zom_decompress, zom_test, zom_bench, zom_train, zom_list } zstd_operation_mode; 
 
#define CLEAN_RETURN(i) { operationResult = (i); goto _end; } 
 
#ifdef ZSTD_NOCOMPRESS 
/* symbols from compression library are not defined and should not be invoked */ 
# define MINCLEVEL  -99 
# define MAXCLEVEL   22 
#else 
# define MINCLEVEL  ZSTD_minCLevel() 
# define MAXCLEVEL  ZSTD_maxCLevel() 
#endif 
 
int main(int argCount, const char* argv[])
{ 
    int argNb, 
        followLinks = 0, 
        allowBlockDevices = 0, 
        forceStdin = 0, 
        forceStdout = 0, 
        hasStdout = 0, 
        ldmFlag = 0, 
        main_pause = 0, 
        nbWorkers = 0, 
        adapt = 0, 
        useRowMatchFinder = 0, 
        adaptMin = MINCLEVEL, 
        adaptMax = MAXCLEVEL, 
        rsyncable = 0, 
        nextArgumentsAreFiles = 0, 
        operationResult = 0, 
        separateFiles = 0, 
        setRealTimePrio = 0, 
        singleThread = 0, 
#ifdef ZSTD_MULTITHREAD
        defaultLogicalCores = 0,
#endif
        showDefaultCParams = 0, 
        ultra=0, 
        contentSize=1; 
    double compressibility = 0.5; 
    unsigned bench_nbSeconds = 3;   /* would be better if this value was synchronized from bench */ 
    size_t blockSize = 0; 
 
    FIO_prefs_t* const prefs = FIO_createPreferences(); 
    FIO_ctx_t* const fCtx = FIO_createContext(); 
    zstd_operation_mode operation = zom_compress; 
    ZSTD_compressionParameters compressionParams; 
    int cLevel = init_cLevel(); 
    int cLevelLast = MINCLEVEL - 1;  /* lower than minimum */ 
    unsigned recursive = 0; 
    unsigned memLimit = 0; 
    FileNamesTable* filenames = UTIL_allocateFileNamesTable((size_t)argCount);  /* argCount >= 1 */ 
    FileNamesTable* file_of_names = UTIL_allocateFileNamesTable((size_t)argCount);  /* argCount >= 1 */ 
    const char* programName = argv[0]; 
    const char* outFileName = NULL; 
    const char* outDirName = NULL; 
    const char* outMirroredDirName = NULL; 
    const char* dictFileName = NULL; 
    const char* patchFromDictFileName = NULL; 
    const char* suffix = ZSTD_EXTENSION; 
    unsigned maxDictSize = g_defaultMaxDictSize; 
    unsigned dictID = 0; 
    size_t streamSrcSize = 0; 
    size_t targetCBlockSize = 0; 
    size_t srcSizeHint = 0; 
    int dictCLevel = g_defaultDictCLevel; 
    unsigned dictSelect = g_defaultSelectivityLevel; 
#ifndef ZSTD_NODICT 
    ZDICT_cover_params_t coverParams = defaultCoverParams(); 
    ZDICT_fastCover_params_t fastCoverParams = defaultFastCoverParams(); 
    dictType dict = fastCover; 
#endif 
#ifndef ZSTD_NOBENCH 
    BMK_advancedParams_t benchParams = BMK_initAdvancedParams(); 
#endif 
    ZSTD_paramSwitch_e literalCompressionMode = ZSTD_ps_auto;
 
 
    /* init */ 
    checkLibVersion(); 
    (void)recursive; (void)cLevelLast;    /* not used when ZSTD_NOBENCH set */ 
    (void)memLimit; 
    assert(argCount >= 1); 
    if ((filenames==NULL) || (file_of_names==NULL)) { DISPLAY("zstd: allocation error \n"); exit(1); } 
    programName = lastNameFromPath(programName); 
#ifdef ZSTD_MULTITHREAD 
    nbWorkers = init_nbThreads(); 
#endif 
 
    /* preset behaviors */ 
    if (exeNameMatch(programName, ZSTD_ZSTDMT)) nbWorkers=0, singleThread=0; 
    if (exeNameMatch(programName, ZSTD_UNZSTD)) operation=zom_decompress; 
    if (exeNameMatch(programName, ZSTD_CAT)) { operation=zom_decompress; FIO_overwriteMode(prefs); forceStdout=1; followLinks=1; outFileName=stdoutmark; g_displayLevel=1; }     /* supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_ZCAT)) { operation=zom_decompress; FIO_overwriteMode(prefs); forceStdout=1; followLinks=1; outFileName=stdoutmark; g_displayLevel=1; }    /* behave like zcat, also supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_GZ)) { suffix = GZ_EXTENSION; FIO_setCompressionType(prefs, FIO_gzipCompression); FIO_setRemoveSrcFile(prefs, 1); }        /* behave like gzip */ 
    if (exeNameMatch(programName, ZSTD_GUNZIP)) { operation=zom_decompress; FIO_setRemoveSrcFile(prefs, 1); }                                                     /* behave like gunzip, also supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_GZCAT)) { operation=zom_decompress; FIO_overwriteMode(prefs); forceStdout=1; followLinks=1; outFileName=stdoutmark; g_displayLevel=1; }   /* behave like gzcat, also supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_LZMA)) { suffix = LZMA_EXTENSION; FIO_setCompressionType(prefs, FIO_lzmaCompression); FIO_setRemoveSrcFile(prefs, 1); }    /* behave like lzma */ 
    if (exeNameMatch(programName, ZSTD_UNLZMA)) { operation=zom_decompress; FIO_setCompressionType(prefs, FIO_lzmaCompression); FIO_setRemoveSrcFile(prefs, 1); } /* behave like unlzma, also supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_XZ)) { suffix = XZ_EXTENSION; FIO_setCompressionType(prefs, FIO_xzCompression); FIO_setRemoveSrcFile(prefs, 1); }          /* behave like xz */ 
    if (exeNameMatch(programName, ZSTD_UNXZ)) { operation=zom_decompress; FIO_setCompressionType(prefs, FIO_xzCompression); FIO_setRemoveSrcFile(prefs, 1); }     /* behave like unxz, also supports multiple formats */ 
    if (exeNameMatch(programName, ZSTD_LZ4)) { suffix = LZ4_EXTENSION; FIO_setCompressionType(prefs, FIO_lz4Compression); }                                       /* behave like lz4 */ 
    if (exeNameMatch(programName, ZSTD_UNLZ4)) { operation=zom_decompress; FIO_setCompressionType(prefs, FIO_lz4Compression); }                                   /* behave like unlz4, also supports multiple formats */ 
    memset(&compressionParams, 0, sizeof(compressionParams)); 
 
    /* init crash handler */ 
    FIO_addAbortHandler(); 
 
    /* command switches */ 
    for (argNb=1; argNb<argCount; argNb++) { 
        const char* argument = argv[argNb]; 
        if (!argument) continue;   /* Protection if argument empty */ 
 
        if (nextArgumentsAreFiles) { 
            UTIL_refFilename(filenames, argument); 
            continue; 
        } 
 
        /* "-" means stdin/stdout */ 
        if (!strcmp(argument, "-")){ 
            UTIL_refFilename(filenames, stdinmark); 
            continue; 
        } 
 
        /* Decode commands (note : aggregated commands are allowed) */ 
        if (argument[0]=='-') { 
 
            if (argument[1]=='-') { 
                /* long commands (--long-word) */ 
                if (!strcmp(argument, "--")) { nextArgumentsAreFiles=1; continue; }   /* only file names allowed from now on */ 
                if (!strcmp(argument, "--list")) { operation=zom_list; continue; } 
                if (!strcmp(argument, "--compress")) { operation=zom_compress; continue; } 
                if (!strcmp(argument, "--decompress")) { operation=zom_decompress; continue; } 
                if (!strcmp(argument, "--uncompress")) { operation=zom_decompress; continue; } 
                if (!strcmp(argument, "--force")) { FIO_overwriteMode(prefs); forceStdin=1; forceStdout=1; followLinks=1; allowBlockDevices=1; continue; } 
                if (!strcmp(argument, "--version")) { printVersion(); CLEAN_RETURN(0); } 
                if (!strcmp(argument, "--help")) { usage_advanced(programName); CLEAN_RETURN(0); } 
                if (!strcmp(argument, "--verbose")) { g_displayLevel++; continue; } 
                if (!strcmp(argument, "--quiet")) { g_displayLevel--; continue; } 
                if (!strcmp(argument, "--stdout")) { forceStdout=1; outFileName=stdoutmark; g_displayLevel-=(g_displayLevel==2); continue; } 
                if (!strcmp(argument, "--ultra")) { ultra=1; continue; } 
                if (!strcmp(argument, "--check")) { FIO_setChecksumFlag(prefs, 2); continue; } 
                if (!strcmp(argument, "--no-check")) { FIO_setChecksumFlag(prefs, 0); continue; } 
                if (!strcmp(argument, "--sparse")) { FIO_setSparseWrite(prefs, 2); continue; } 
                if (!strcmp(argument, "--no-sparse")) { FIO_setSparseWrite(prefs, 0); continue; } 
                if (!strcmp(argument, "--test")) { operation=zom_test; continue; } 
                if (!strcmp(argument, "--train")) { operation=zom_train; if (outFileName==NULL) outFileName=g_defaultDictName; continue; } 
                if (!strcmp(argument, "--no-dictID")) { FIO_setDictIDFlag(prefs, 0); continue; } 
                if (!strcmp(argument, "--keep")) { FIO_setRemoveSrcFile(prefs, 0); continue; } 
                if (!strcmp(argument, "--rm")) { FIO_setRemoveSrcFile(prefs, 1); continue; } 
                if (!strcmp(argument, "--priority=rt")) { setRealTimePrio = 1; continue; } 
                if (!strcmp(argument, "--show-default-cparams")) { showDefaultCParams = 1; continue; } 
                if (!strcmp(argument, "--content-size")) { contentSize = 1; continue; } 
                if (!strcmp(argument, "--no-content-size")) { contentSize = 0; continue; } 
                if (!strcmp(argument, "--adapt")) { adapt = 1; continue; } 
                if (!strcmp(argument, "--no-row-match-finder")) { useRowMatchFinder = 1; continue; } 
                if (!strcmp(argument, "--row-match-finder")) { useRowMatchFinder = 2; continue; } 
                if (longCommandWArg(&argument, "--adapt=")) { adapt = 1; if (!parseAdaptParameters(argument, &adaptMin, &adaptMax)) { badusage(programName); CLEAN_RETURN(1); } continue; } 
                if (!strcmp(argument, "--single-thread")) { nbWorkers = 0; singleThread = 1; continue; } 
                if (!strcmp(argument, "--format=zstd")) { suffix = ZSTD_EXTENSION; FIO_setCompressionType(prefs, FIO_zstdCompression); continue; } 
#ifdef ZSTD_GZCOMPRESS 
                if (!strcmp(argument, "--format=gzip")) { suffix = GZ_EXTENSION; FIO_setCompressionType(prefs, FIO_gzipCompression); continue; } 
#endif 
#ifdef ZSTD_LZMACOMPRESS 
                if (!strcmp(argument, "--format=lzma")) { suffix = LZMA_EXTENSION; FIO_setCompressionType(prefs, FIO_lzmaCompression);  continue; } 
                if (!strcmp(argument, "--format=xz")) { suffix = XZ_EXTENSION; FIO_setCompressionType(prefs, FIO_xzCompression);  continue; } 
#endif 
#ifdef ZSTD_LZ4COMPRESS 
                if (!strcmp(argument, "--format=lz4")) { suffix = LZ4_EXTENSION; FIO_setCompressionType(prefs, FIO_lz4Compression);  continue; } 
#endif 
                if (!strcmp(argument, "--rsyncable")) { rsyncable = 1; continue; } 
                if (!strcmp(argument, "--compress-literals")) { literalCompressionMode = ZSTD_ps_enable; continue; }
                if (!strcmp(argument, "--no-compress-literals")) { literalCompressionMode = ZSTD_ps_disable; continue; }
                if (!strcmp(argument, "--no-progress")) { FIO_setProgressSetting(FIO_ps_never); continue; } 
                if (!strcmp(argument, "--progress")) { FIO_setProgressSetting(FIO_ps_always); continue; } 
                if (!strcmp(argument, "--exclude-compressed")) { FIO_setExcludeCompressedFile(prefs, 1); continue; } 
 
                /* long commands with arguments */ 
#ifndef ZSTD_NODICT 
                if (longCommandWArg(&argument, "--train-cover")) { 
                  operation = zom_train; 
                  if (outFileName == NULL) 
                      outFileName = g_defaultDictName; 
                  dict = cover; 
                  /* Allow optional arguments following an = */ 
                  if (*argument == 0) { memset(&coverParams, 0, sizeof(coverParams)); } 
                  else if (*argument++ != '=') { badusage(programName); CLEAN_RETURN(1); } 
                  else if (!parseCoverParameters(argument, &coverParams)) { badusage(programName); CLEAN_RETURN(1); } 
                  continue; 
                } 
                if (longCommandWArg(&argument, "--train-fastcover")) { 
                  operation = zom_train; 
                  if (outFileName == NULL) 
                      outFileName = g_defaultDictName; 
                  dict = fastCover; 
                  /* Allow optional arguments following an = */ 
                  if (*argument == 0) { memset(&fastCoverParams, 0, sizeof(fastCoverParams)); } 
                  else if (*argument++ != '=') { badusage(programName); CLEAN_RETURN(1); } 
                  else if (!parseFastCoverParameters(argument, &fastCoverParams)) { badusage(programName); CLEAN_RETURN(1); } 
                  continue; 
                } 
                if (longCommandWArg(&argument, "--train-legacy")) { 
                  operation = zom_train; 
                  if (outFileName == NULL) 
                      outFileName = g_defaultDictName; 
                  dict = legacy; 
                  /* Allow optional arguments following an = */ 
                  if (*argument == 0) { continue; } 
                  else if (*argument++ != '=') { badusage(programName); CLEAN_RETURN(1); } 
                  else if (!parseLegacyParameters(argument, &dictSelect)) { badusage(programName); CLEAN_RETURN(1); } 
                  continue; 
                } 
#endif 
                if (longCommandWArg(&argument, "--threads")) { NEXT_UINT32(nbWorkers); continue; } 
                if (longCommandWArg(&argument, "--memlimit")) { NEXT_UINT32(memLimit); continue; } 
                if (longCommandWArg(&argument, "--memory")) { NEXT_UINT32(memLimit); continue; } 
                if (longCommandWArg(&argument, "--memlimit-decompress")) { NEXT_UINT32(memLimit); continue; } 
                if (longCommandWArg(&argument, "--block-size=")) { blockSize = readSizeTFromChar(&argument); continue; } 
                if (longCommandWArg(&argument, "--maxdict")) { NEXT_UINT32(maxDictSize); continue; } 
                if (longCommandWArg(&argument, "--dictID")) { NEXT_UINT32(dictID); continue; } 
                if (longCommandWArg(&argument, "--zstd=")) { if (!parseCompressionParameters(argument, &compressionParams)) { badusage(programName); CLEAN_RETURN(1); } continue; } 
                if (longCommandWArg(&argument, "--stream-size=")) { streamSrcSize = readSizeTFromChar(&argument); continue; } 
                if (longCommandWArg(&argument, "--target-compressed-block-size=")) { targetCBlockSize = readSizeTFromChar(&argument); continue; } 
                if (longCommandWArg(&argument, "--size-hint=")) { srcSizeHint = readSizeTFromChar(&argument); continue; } 
                if (longCommandWArg(&argument, "--output-dir-flat")) { NEXT_FIELD(outDirName); continue; } 
#ifdef ZSTD_MULTITHREAD
                if (longCommandWArg(&argument, "--auto-threads")) {
                    const char* threadDefault = NULL;
                    NEXT_FIELD(threadDefault);
                    if (strcmp(threadDefault, "logical") == 0)
                        defaultLogicalCores = 1;
                    continue;
                }
#endif
#ifdef UTIL_HAS_MIRRORFILELIST 
                if (longCommandWArg(&argument, "--output-dir-mirror")) { NEXT_FIELD(outMirroredDirName); continue; } 
#endif 
#ifndef ZSTD_NOTRACE 
                if (longCommandWArg(&argument, "--trace")) { char const* traceFile; NEXT_FIELD(traceFile); TRACE_enable(traceFile); continue; } 
#endif 
                if (longCommandWArg(&argument, "--patch-from")) { NEXT_FIELD(patchFromDictFileName); continue; } 
                if (longCommandWArg(&argument, "--long")) { 
                    unsigned ldmWindowLog = 0; 
                    ldmFlag = 1; 
                    /* Parse optional window log */ 
                    if (*argument == '=') { 
                        ++argument; 
                        ldmWindowLog = readU32FromChar(&argument); 
                    } else if (*argument != 0) { 
                        /* Invalid character following --long */ 
                        badusage(programName); 
                        CLEAN_RETURN(1); 
                    } 
                    /* Only set windowLog if not already set by --zstd */ 
                    if (compressionParams.windowLog == 0) 
                        compressionParams.windowLog = ldmWindowLog; 
                    continue; 
                } 
#ifndef ZSTD_NOCOMPRESS   /* linking ZSTD_minCLevel() requires compression support */ 
                if (longCommandWArg(&argument, "--fast")) { 
                    /* Parse optional acceleration factor */ 
                    if (*argument == '=') { 
                        U32 const maxFast = (U32)-ZSTD_minCLevel(); 
                        U32 fastLevel; 
                        ++argument; 
                        fastLevel = readU32FromChar(&argument); 
                        if (fastLevel > maxFast) fastLevel = maxFast; 
                        if (fastLevel) { 
                            dictCLevel = cLevel = -(int)fastLevel; 
                        } else { 
                            badusage(programName); 
                            CLEAN_RETURN(1); 
                        } 
                    } else if (*argument != 0) { 
                        /* Invalid character following --fast */ 
                        badusage(programName); 
                        CLEAN_RETURN(1); 
                    } else { 
                        cLevel = -1;  /* default for --fast */ 
                    } 
                    continue; 
                } 
#endif 
 
                if (longCommandWArg(&argument, "--filelist")) { 
                    const char* listName; 
                    NEXT_FIELD(listName); 
                    UTIL_refFilename(file_of_names, listName); 
                    continue; 
                } 
 
                /* fall-through, will trigger bad_usage() later on */ 
            } 
 
            argument++; 
            while (argument[0]!=0) { 
 
#ifndef ZSTD_NOCOMPRESS 
                /* compression Level */ 
                if ((*argument>='0') && (*argument<='9')) { 
                    dictCLevel = cLevel = (int)readU32FromChar(&argument); 
                    continue; 
                } 
#endif 
 
                switch(argument[0]) 
                { 
                    /* Display help */ 
                case 'V': printVersion(); CLEAN_RETURN(0);   /* Version Only */ 
                case 'H': 
                case 'h': usage_advanced(programName); CLEAN_RETURN(0); 
 
                     /* Compress */ 
                case 'z': operation=zom_compress; argument++; break; 
 
                     /* Decoding */ 
                case 'd': 
#ifndef ZSTD_NOBENCH 
                        benchParams.mode = BMK_decodeOnly; 
                        if (operation==zom_bench) { argument++; break; }  /* benchmark decode (hidden option) */ 
#endif 
                        operation=zom_decompress; argument++; break; 
 
                    /* Force stdout, even if stdout==console */ 
                case 'c': forceStdout=1; outFileName=stdoutmark; argument++; break; 
 
                    /* Use file content as dictionary */ 
                case 'D': argument++; NEXT_FIELD(dictFileName); break; 
 
                    /* Overwrite */ 
                case 'f': FIO_overwriteMode(prefs); forceStdin=1; forceStdout=1; followLinks=1; allowBlockDevices=1; argument++; break; 
 
                    /* Verbose mode */ 
                case 'v': g_displayLevel++; argument++; break; 
 
                    /* Quiet mode */ 
                case 'q': g_displayLevel--; argument++; break; 
 
                    /* keep source file (default) */ 
                case 'k': FIO_setRemoveSrcFile(prefs, 0); argument++; break; 
 
                    /* Checksum */ 
                case 'C': FIO_setChecksumFlag(prefs, 2); argument++; break; 
 
                    /* test compressed file */ 
                case 't': operation=zom_test; argument++; break; 
 
                    /* destination file name */ 
                case 'o': argument++; NEXT_FIELD(outFileName); break; 
 
                    /* limit memory */ 
                case 'M': 
                    argument++; 
                    memLimit = readU32FromChar(&argument); 
                    break; 
                case 'l': operation=zom_list; argument++; break; 
#ifdef UTIL_HAS_CREATEFILELIST 
                    /* recursive */ 
                case 'r': recursive=1; argument++; break; 
#endif 
 
#ifndef ZSTD_NOBENCH 
                    /* Benchmark */ 
                case 'b': 
                    operation=zom_bench; 
                    argument++; 
                    break; 
 
                    /* range bench (benchmark only) */ 
                case 'e': 
                    /* compression Level */ 
                    argument++; 
                    cLevelLast = (int)readU32FromChar(&argument); 
                    break; 
 
                    /* Modify Nb Iterations (benchmark only) */ 
                case 'i': 
                    argument++; 
                    bench_nbSeconds = readU32FromChar(&argument); 
                    break; 
 
                    /* cut input into blocks (benchmark only) */ 
                case 'B': 
                    argument++; 
                    blockSize = readU32FromChar(&argument); 
                    break; 
 
                    /* benchmark files separately (hidden option) */ 
                case 'S': 
                    argument++; 
                    separateFiles = 1; 
                    break; 
 
#endif   /* ZSTD_NOBENCH */ 
 
                    /* nb of threads (hidden option) */ 
                case 'T': 
                    argument++; 
                    nbWorkers = (int)readU32FromChar(&argument); 
                    break; 
 
                    /* Dictionary Selection level */ 
                case 's': 
                    argument++; 
                    dictSelect = readU32FromChar(&argument); 
                    break; 
 
                    /* Pause at the end (-p) or set an additional param (-p#) (hidden option) */ 
                case 'p': argument++; 
#ifndef ZSTD_NOBENCH 
                    if ((*argument>='0') && (*argument<='9')) { 
                        benchParams.additionalParam = (int)readU32FromChar(&argument); 
                    } else 
#endif 
                        main_pause=1; 
                    break; 
 
                    /* Select compressibility of synthetic sample */ 
                case 'P': 
                    argument++; 
                    compressibility = (double)readU32FromChar(&argument) / 100; 
                    break; 
 
                    /* unknown command */ 
                default : badusage(programName); CLEAN_RETURN(1); 
                } 
            } 
            continue; 
        }   /* if (argument[0]=='-') */ 
 
        /* none of the above : add filename to list */ 
        UTIL_refFilename(filenames, argument); 
    } 
 
    /* Welcome message (if verbose) */ 
    DISPLAYLEVEL(3, WELCOME_MESSAGE); 
 
#ifdef ZSTD_MULTITHREAD 
    if ((nbWorkers==0) && (!singleThread)) { 
        /* automatically set # workers based on # of reported cpus */ 
        if (defaultLogicalCores) {
            nbWorkers = UTIL_countLogicalCores();
            DISPLAYLEVEL(3, "Note: %d logical core(s) detected \n", nbWorkers);
        } else {
            nbWorkers = UTIL_countPhysicalCores();
            DISPLAYLEVEL(3, "Note: %d physical core(s) detected \n", nbWorkers);
        }
    } 
#else 
    (void)singleThread; (void)nbWorkers; 
#endif 
 
    g_utilDisplayLevel = g_displayLevel;

#ifdef UTIL_HAS_CREATEFILELIST 
    if (!followLinks) { 
        unsigned u, fileNamesNb; 
        unsigned const nbFilenames = (unsigned)filenames->tableSize; 
        for (u=0, fileNamesNb=0; u<nbFilenames; u++) { 
            if ( UTIL_isLink(filenames->fileNames[u]) 
             && !UTIL_isFIFO(filenames->fileNames[u]) 
            ) { 
                DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring \n", filenames->fileNames[u]); 
            } else { 
                filenames->fileNames[fileNamesNb++] = filenames->fileNames[u]; 
        }   } 
        if (fileNamesNb == 0 && nbFilenames > 0)  /* all names are eliminated */ 
            CLEAN_RETURN(1); 
        filenames->tableSize = fileNamesNb; 
    }   /* if (!followLinks) */ 
 
    /* read names from a file */ 
    if (file_of_names->tableSize) { 
        size_t const nbFileLists = file_of_names->tableSize; 
        size_t flNb; 
        for (flNb=0; flNb < nbFileLists; flNb++) { 
            FileNamesTable* const fnt = UTIL_createFileNamesTable_fromFileName(file_of_names->fileNames[flNb]); 
            if (fnt==NULL) { 
                DISPLAYLEVEL(1, "zstd: error reading %s \n", file_of_names->fileNames[flNb]); 
                CLEAN_RETURN(1); 
            } 
            filenames = UTIL_mergeFileNamesTable(filenames, fnt); 
        } 
    } 
 
    if (recursive) {  /* at this stage, filenameTable is a list of paths, which can contain both files and directories */ 
        UTIL_expandFNT(&filenames, followLinks); 
    } 
#else 
    (void)followLinks; 
#endif 
 
    if (operation == zom_list) { 
#ifndef ZSTD_NODECOMPRESS 
        int const ret = FIO_listMultipleFiles((unsigned)filenames->tableSize, filenames->fileNames, g_displayLevel); 
        CLEAN_RETURN(ret); 
#else 
        DISPLAY("file information is not supported \n"); 
        CLEAN_RETURN(1); 
#endif 
    } 
 
    /* Check if benchmark is selected */ 
    if (operation==zom_bench) { 
#ifndef ZSTD_NOBENCH 
        benchParams.blockSize = blockSize; 
        benchParams.nbWorkers = nbWorkers; 
        benchParams.realTime = (unsigned)setRealTimePrio; 
        benchParams.nbSeconds = bench_nbSeconds; 
        benchParams.ldmFlag = ldmFlag; 
        benchParams.ldmMinMatch = (int)g_ldmMinMatch; 
        benchParams.ldmHashLog = (int)g_ldmHashLog; 
        benchParams.useRowMatchFinder = useRowMatchFinder; 
        if (g_ldmBucketSizeLog != LDM_PARAM_DEFAULT) { 
            benchParams.ldmBucketSizeLog = (int)g_ldmBucketSizeLog; 
        } 
        if (g_ldmHashRateLog != LDM_PARAM_DEFAULT) { 
            benchParams.ldmHashRateLog = (int)g_ldmHashRateLog; 
        } 
        benchParams.literalCompressionMode = literalCompressionMode; 
 
        if (cLevel > ZSTD_maxCLevel()) cLevel = ZSTD_maxCLevel(); 
        if (cLevelLast > ZSTD_maxCLevel()) cLevelLast = ZSTD_maxCLevel(); 
        if (cLevelLast < cLevel) cLevelLast = cLevel; 
        if (cLevelLast > cLevel) 
            DISPLAYLEVEL(3, "Benchmarking levels from %d to %d\n", cLevel, cLevelLast); 
        if (filenames->tableSize > 0) { 
            if(separateFiles) { 
                unsigned i; 
                for(i = 0; i < filenames->tableSize; i++) { 
                    int c; 
                    DISPLAYLEVEL(3, "Benchmarking %s \n", filenames->fileNames[i]); 
                    for(c = cLevel; c <= cLevelLast; c++) { 
                        BMK_benchFilesAdvanced(&filenames->fileNames[i], 1, dictFileName, c, &compressionParams, g_displayLevel, &benchParams); 
                }   } 
            } else { 
                for(; cLevel <= cLevelLast; cLevel++) { 
                    BMK_benchFilesAdvanced(filenames->fileNames, (unsigned)filenames->tableSize, dictFileName, cLevel, &compressionParams, g_displayLevel, &benchParams); 
            }   } 
        } else { 
            for(; cLevel <= cLevelLast; cLevel++) { 
                BMK_syntheticTest(cLevel, compressibility, &compressionParams, g_displayLevel, &benchParams); 
        }   } 
 
#else 
        (void)bench_nbSeconds; (void)blockSize; (void)setRealTimePrio; (void)separateFiles; (void)compressibility; 
#endif 
        goto _end; 
    } 
 
    /* Check if dictionary builder is selected */ 
    if (operation==zom_train) { 
#ifndef ZSTD_NODICT 
        ZDICT_params_t zParams; 
        zParams.compressionLevel = dictCLevel; 
        zParams.notificationLevel = (unsigned)g_displayLevel; 
        zParams.dictID = dictID; 
        if (dict == cover) { 
            int const optimize = !coverParams.k || !coverParams.d; 
            coverParams.nbThreads = (unsigned)nbWorkers; 
            coverParams.zParams = zParams; 
            operationResult = DiB_trainFromFiles(outFileName, maxDictSize, filenames->fileNames, (int)filenames->tableSize, blockSize, NULL, &coverParams, NULL, optimize, memLimit);
        } else if (dict == fastCover) { 
            int const optimize = !fastCoverParams.k || !fastCoverParams.d; 
            fastCoverParams.nbThreads = (unsigned)nbWorkers; 
            fastCoverParams.zParams = zParams; 
            operationResult = DiB_trainFromFiles(outFileName, maxDictSize, filenames->fileNames, (int)filenames->tableSize, blockSize, NULL, NULL, &fastCoverParams, optimize, memLimit);
        } else { 
            ZDICT_legacy_params_t dictParams; 
            memset(&dictParams, 0, sizeof(dictParams)); 
            dictParams.selectivityLevel = dictSelect; 
            dictParams.zParams = zParams; 
            operationResult = DiB_trainFromFiles(outFileName, maxDictSize, filenames->fileNames, (int)filenames->tableSize, blockSize, &dictParams, NULL, NULL, 0, memLimit);
        } 
#else 
        (void)dictCLevel; (void)dictSelect; (void)dictID;  (void)maxDictSize; /* not used when ZSTD_NODICT set */ 
        DISPLAYLEVEL(1, "training mode not available \n"); 
        operationResult = 1; 
#endif 
        goto _end; 
    } 
 
#ifndef ZSTD_NODECOMPRESS 
    if (operation==zom_test) { FIO_setTestMode(prefs, 1); outFileName=nulmark; FIO_setRemoveSrcFile(prefs, 0); }  /* test mode */ 
#endif 
 
    /* No input filename ==> use stdin and stdout */ 
    if (filenames->tableSize == 0) UTIL_refFilename(filenames, stdinmark); 
    if (!strcmp(filenames->fileNames[0], stdinmark) && !outFileName) 
        outFileName = stdoutmark;  /* when input is stdin, default output is stdout */ 
 
    /* Check if input/output defined as console; trigger an error in this case */ 
    if (!forceStdin 
     && !strcmp(filenames->fileNames[0], stdinmark) 
     && IS_CONSOLE(stdin) ) { 
        DISPLAYLEVEL(1, "stdin is a console, aborting\n"); 
        CLEAN_RETURN(1); 
    } 
    if ( outFileName && !strcmp(outFileName, stdoutmark) 
      && IS_CONSOLE(stdout) 
      && !strcmp(filenames->fileNames[0], stdinmark) 
      && !forceStdout 
      && operation!=zom_decompress ) { 
        DISPLAYLEVEL(1, "stdout is a console, aborting\n"); 
        CLEAN_RETURN(1); 
    } 
 
#ifndef ZSTD_NOCOMPRESS 
    /* check compression level limits */ 
    {   int const maxCLevel = ultra ? ZSTD_maxCLevel() : ZSTDCLI_CLEVEL_MAX; 
        if (cLevel > maxCLevel) { 
            DISPLAYLEVEL(2, "Warning : compression level higher than max, reduced to %i \n", maxCLevel); 
            cLevel = maxCLevel; 
    }   } 
#endif 
 
    if (showDefaultCParams) { 
        if (operation == zom_decompress) { 
            DISPLAY("error : can't use --show-default-cparams in decomrpession mode \n"); 
            CLEAN_RETURN(1); 
        } 
    } 
 
    if (dictFileName != NULL && patchFromDictFileName != NULL) { 
        DISPLAY("error : can't use -D and --patch-from=# at the same time \n"); 
        CLEAN_RETURN(1); 
    } 
 
    if (patchFromDictFileName != NULL && filenames->tableSize > 1) { 
        DISPLAY("error : can't use --patch-from=# on multiple files \n"); 
        CLEAN_RETURN(1); 
    } 
 
    /* No status message in pipe mode (stdin - stdout) */ 
    hasStdout = outFileName && !strcmp(outFileName,stdoutmark); 
 
    if ((hasStdout || !IS_CONSOLE(stderr)) && (g_displayLevel==2)) g_displayLevel=1;
 
    /* IO Stream/File */ 
    FIO_setHasStdoutOutput(fCtx, hasStdout); 
    FIO_setNbFilesTotal(fCtx, (int)filenames->tableSize); 
    FIO_determineHasStdinInput(fCtx, filenames); 
    FIO_setNotificationLevel(g_displayLevel); 
    FIO_setAllowBlockDevices(prefs, allowBlockDevices); 
    FIO_setPatchFromMode(prefs, patchFromDictFileName != NULL); 
    if (memLimit == 0) { 
        if (compressionParams.windowLog == 0) { 
            memLimit = (U32)1 << g_defaultMaxWindowLog; 
        } else { 
            memLimit = (U32)1 << (compressionParams.windowLog & 31); 
    }   } 
    if (patchFromDictFileName != NULL) 
        dictFileName = patchFromDictFileName; 
    FIO_setMemLimit(prefs, memLimit); 
    if (operation==zom_compress) { 
#ifndef ZSTD_NOCOMPRESS 
        FIO_setContentSize(prefs, contentSize); 
        FIO_setNbWorkers(prefs, nbWorkers); 
        FIO_setBlockSize(prefs, (int)blockSize); 
        if (g_overlapLog!=OVERLAP_LOG_DEFAULT) FIO_setOverlapLog(prefs, (int)g_overlapLog); 
        FIO_setLdmFlag(prefs, (unsigned)ldmFlag); 
        FIO_setLdmHashLog(prefs, (int)g_ldmHashLog); 
        FIO_setLdmMinMatch(prefs, (int)g_ldmMinMatch); 
        if (g_ldmBucketSizeLog != LDM_PARAM_DEFAULT) FIO_setLdmBucketSizeLog(prefs, (int)g_ldmBucketSizeLog); 
        if (g_ldmHashRateLog != LDM_PARAM_DEFAULT) FIO_setLdmHashRateLog(prefs, (int)g_ldmHashRateLog); 
        FIO_setAdaptiveMode(prefs, (unsigned)adapt); 
        FIO_setUseRowMatchFinder(prefs, useRowMatchFinder); 
        FIO_setAdaptMin(prefs, adaptMin); 
        FIO_setAdaptMax(prefs, adaptMax); 
        FIO_setRsyncable(prefs, rsyncable); 
        FIO_setStreamSrcSize(prefs, streamSrcSize); 
        FIO_setTargetCBlockSize(prefs, targetCBlockSize); 
        FIO_setSrcSizeHint(prefs, srcSizeHint); 
        FIO_setLiteralCompressionMode(prefs, literalCompressionMode); 
        if (adaptMin > cLevel) cLevel = adaptMin; 
        if (adaptMax < cLevel) cLevel = adaptMax; 
 
        /* Compare strategies constant with the ground truth */ 
        { ZSTD_bounds strategyBounds = ZSTD_cParam_getBounds(ZSTD_c_strategy); 
          assert(ZSTD_NB_STRATEGIES == strategyBounds.upperBound); 
          (void)strategyBounds; } 
 
        if (showDefaultCParams || g_displayLevel >= 4) {
            size_t fileNb; 
            for (fileNb = 0; fileNb < (size_t)filenames->tableSize; fileNb++) { 
                if (showDefaultCParams)
                    printDefaultCParams(filenames->fileNames[fileNb], dictFileName, cLevel);
                if (g_displayLevel >= 4)
                    printActualCParams(filenames->fileNames[fileNb], dictFileName, cLevel, &compressionParams);
            } 
        } 
 
        if (g_displayLevel >= 4)
            FIO_displayCompressionParameters(prefs);
        if ((filenames->tableSize==1) && outFileName) 
            operationResult = FIO_compressFilename(fCtx, prefs, outFileName, filenames->fileNames[0], dictFileName, cLevel, compressionParams); 
        else 
            operationResult = FIO_compressMultipleFilenames(fCtx, prefs, filenames->fileNames, outMirroredDirName, outDirName, outFileName, suffix, dictFileName, cLevel, compressionParams); 
#else 
        (void)contentSize; (void)suffix; (void)adapt; (void)rsyncable; (void)ultra; (void)cLevel; (void)ldmFlag; (void)literalCompressionMode; (void)targetCBlockSize; (void)streamSrcSize; (void)srcSizeHint; (void)ZSTD_strategyMap; (void)useRowMatchFinder; /* not used when ZSTD_NOCOMPRESS set */ 
        DISPLAY("Compression not supported \n"); 
#endif 
    } else {  /* decompression or test */ 
#ifndef ZSTD_NODECOMPRESS 
        if (filenames->tableSize == 1 && outFileName) { 
            operationResult = FIO_decompressFilename(fCtx, prefs, outFileName, filenames->fileNames[0], dictFileName); 
        } else { 
            operationResult = FIO_decompressMultipleFilenames(fCtx, prefs, filenames->fileNames, outMirroredDirName, outDirName, outFileName, dictFileName); 
        } 
#else 
        DISPLAY("Decompression not supported \n"); 
#endif 
    } 
 
_end: 
    FIO_freePreferences(prefs); 
    FIO_freeContext(fCtx); 
    if (main_pause) waitEnter(); 
    UTIL_freeFileNamesTable(filenames); 
    UTIL_freeFileNamesTable(file_of_names); 
#ifndef ZSTD_NOTRACE 
    TRACE_finish(); 
#endif 
 
    return operationResult; 
}