summaryrefslogtreecommitdiffstats
path: root/programs/lz4cli.c
blob: dede8345997efb48375ea50db92254b955723ebd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
/*
  LZ4cli - LZ4 Command Line Interface
  Copyright (C) Yann Collet 2011-2016

  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 :
  - LZ4 source repository : https://github.com/lz4/lz4
  - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
/*
  Note : this is stand-alone program.
  It is not part of LZ4 compression library, it is a user program of the LZ4 library.
  The license of LZ4 library is BSD.
  The license of xxHash library is BSD.
  The license of this compression CLI program is GPLv2.
*/

/**************************************
*  Tuning parameters
***************************************/
/* ENABLE_LZ4C_LEGACY_OPTIONS :
   Control the availability of -c0, -c1 and -hc legacy arguments
   Default : Legacy options are disabled */
/* #define ENABLE_LZ4C_LEGACY_OPTIONS */


/****************************
*  Includes
*****************************/
#include "platform.h" /* Compiler options, IS_CONSOLE */
#include "util.h"     /* UTIL_HAS_CREATEFILELIST, UTIL_createFileList */
#include <stdio.h>    /* fprintf, getchar */
#include <stdlib.h>   /* exit, calloc, free */
#include <string.h>   /* strcmp, strlen */
#include "bench.h"    /* BMK_benchFile, BMK_SetNbIterations, BMK_SetBlocksize, BMK_SetPause */
#include "lz4io.h"    /* LZ4IO_compressFilename, LZ4IO_decompressFilename, LZ4IO_compressMultipleFilenames */
#include "lz4hc.h"    /* LZ4HC_CLEVEL_MAX */
#include "lz4.h"      /* LZ4_VERSION_STRING */


/*****************************
*  Constants
******************************/
#define COMPRESSOR_NAME "LZ4 command line interface"
#define AUTHOR "Yann Collet"
#define WELCOME_MESSAGE "*** %s %i-bits v%s, by %s ***\n", COMPRESSOR_NAME, (int)(sizeof(void*)*8), LZ4_versionString(), AUTHOR
#define LZ4_EXTENSION ".lz4"
#define LZ4CAT "lz4cat"
#define UNLZ4 "unlz4"

#define KB *(1U<<10)
#define MB *(1U<<20)
#define GB *(1U<<30)

#define LZ4_BLOCKSIZEID_DEFAULT 7


/*-************************************
*  Macros
***************************************/
#define DISPLAY(...)           fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...)   if (displayLevel>=l) { DISPLAY(__VA_ARGS__); }
static unsigned displayLevel = 2;   /* 0 : no display ; 1: errors only ; 2 : downgradable normal ; 3 : non-downgradable normal; 4 : + information */


/*-************************************
*  Exceptions
***************************************/
#define DEBUG 0
#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);                                                          \
}


/*-************************************
*  Version modifiers
***************************************/
#define EXTENDED_ARGUMENTS
#define EXTENDED_HELP
#define EXTENDED_FORMAT
#define DEFAULT_COMPRESSOR   LZ4IO_compressFilename
#define DEFAULT_DECOMPRESSOR LZ4IO_decompressFilename
int LZ4IO_compressFilename_Legacy(const char* input_filename, const char* output_filename, int compressionlevel);   /* hidden function */


/*-***************************
*  Functions
*****************************/
static int usage(const char* exeName)
{
    DISPLAY( "Usage : \n");
    DISPLAY( "      %s [arg] [input] [output] \n", exeName);
    DISPLAY( "\n");
    DISPLAY( "input   : a filename \n");
    DISPLAY( "          with no FILE, or when FILE is - or %s, read standard input\n", stdinmark);
    DISPLAY( "Arguments : \n");
    DISPLAY( " -1     : Fast compression (default) \n");
    DISPLAY( " -9     : High compression \n");
    DISPLAY( " -d     : decompression (default for %s extension)\n", LZ4_EXTENSION);
    DISPLAY( " -z     : force compression \n");
    DISPLAY( " -f     : overwrite output without prompting \n");
    DISPLAY( " -k     : preserve source files(s)  (default) \n");
    DISPLAY( "--rm    : remove source file(s) after successful de/compression \n");
    DISPLAY( " -h/-H  : display help/long help and exit \n");
    return 0;
}

static int usage_advanced(const char* exeName)
{
    DISPLAY(WELCOME_MESSAGE);
    usage(exeName);
    DISPLAY( "\n");
    DISPLAY( "Advanced arguments :\n");
    DISPLAY( " -V     : display Version number and exit \n");
    DISPLAY( " -v     : verbose mode \n");
    DISPLAY( " -q     : suppress warnings; specify twice to suppress errors too\n");
    DISPLAY( " -c     : force write to standard output, even if it is the console\n");
    DISPLAY( " -t     : test compressed file integrity\n");
    DISPLAY( " -m     : multiple input files (implies automatic output filenames)\n");
#ifdef UTIL_HAS_CREATEFILELIST
    DISPLAY( " -r     : operate recursively on directories (sets also -m) \n");
#endif
    DISPLAY( " -l     : compress using Legacy format (Linux kernel compression)\n");
    DISPLAY( " -B#    : Block size [4-7] (default : 7) \n");
    DISPLAY( " -BD    : Block dependency (improve compression ratio) \n");
    DISPLAY( " -BX    : enable block checksum (default:disabled) \n");
    DISPLAY( "--no-frame-crc : disable stream checksum (default:enabled) \n");
    DISPLAY( "--content-size : compressed frame includes original size (default:not present)\n");
    DISPLAY( "--[no-]sparse  : sparse mode (default:enabled on file, disabled on stdout)\n");
    DISPLAY( "Benchmark arguments : \n");
    DISPLAY( " -b#    : benchmark file(s), using # compression level (default : 1) \n");
    DISPLAY( " -e#    : test all compression levels from -bX to # (default : 1)\n");
    DISPLAY( " -i#    : minimum evaluation time in seconds (default : 3s) \n");
    DISPLAY( " -B#    : cut file into independent blocks of size # bytes [32+] \n");
    DISPLAY( "                     or predefined block size [4-7] (default: 7) \n");
#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
    DISPLAY( "Legacy arguments : \n");
    DISPLAY( " -c0    : fast compression \n");
    DISPLAY( " -c1    : high compression \n");
    DISPLAY( " -hc    : high compression \n");
    DISPLAY( " -y     : overwrite output without prompting \n");
#endif /* ENABLE_LZ4C_LEGACY_OPTIONS */
    EXTENDED_HELP;
    return 0;
}

static int usage_longhelp(const char* exeName)
{
    usage_advanced(exeName);
    DISPLAY( "\n");
    DISPLAY( "****************************\n");
    DISPLAY( "***** Advanced comment *****\n");
    DISPLAY( "****************************\n");
    DISPLAY( "\n");
    DISPLAY( "Which values can [output] have ? \n");
    DISPLAY( "---------------------------------\n");
    DISPLAY( "[output] : a filename \n");
    DISPLAY( "          '%s', or '-' for standard output (pipe mode)\n", stdoutmark);
    DISPLAY( "          '%s' to discard output (test mode) \n", NULL_OUTPUT);
    DISPLAY( "[output] can be left empty. In this case, it receives the following value :\n");
    DISPLAY( "          - if stdout is not the console, then [output] = stdout \n");
    DISPLAY( "          - if stdout is console : \n");
    DISPLAY( "               + for compression, output to filename%s \n", LZ4_EXTENSION);
    DISPLAY( "               + for decompression, output to filename without '%s'\n", LZ4_EXTENSION);
    DISPLAY( "                    > if input filename has no '%s' extension : error \n", LZ4_EXTENSION);
    DISPLAY( "\n");
    DISPLAY( "Compression levels : \n");
    DISPLAY( "---------------------\n");
    DISPLAY( "-0 ... -2  => Fast compression, all identicals\n");
    DISPLAY( "-3 ... -%d => High compression; higher number == more compression but slower\n", LZ4HC_CLEVEL_MAX);
    DISPLAY( "\n");
    DISPLAY( "stdin, stdout and the console : \n");
    DISPLAY( "--------------------------------\n");
    DISPLAY( "To protect the console from binary flooding (bad argument mistake)\n");
    DISPLAY( "%s will refuse to read from console, or write to console \n", exeName);
    DISPLAY( "except if '-c' command is specified, to force output to console \n");
    DISPLAY( "\n");
    DISPLAY( "Simple example :\n");
    DISPLAY( "----------------\n");
    DISPLAY( "1 : compress 'filename' fast, using default output name 'filename.lz4'\n");
    DISPLAY( "          %s filename\n", exeName);
    DISPLAY( "\n");
    DISPLAY( "Short arguments can be aggregated. For example :\n");
    DISPLAY( "----------------------------------\n");
    DISPLAY( "2 : compress 'filename' in high compression mode, overwrite output if exists\n");
    DISPLAY( "          %s -9 -f filename \n", exeName);
    DISPLAY( "    is equivalent to :\n");
    DISPLAY( "          %s -9f filename \n", exeName);
    DISPLAY( "\n");
    DISPLAY( "%s can be used in 'pure pipe mode'. For example :\n", exeName);
    DISPLAY( "-------------------------------------\n");
    DISPLAY( "3 : compress data stream from 'generator', send result to 'consumer'\n");
    DISPLAY( "          generator | %s | consumer \n", exeName);
#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
    DISPLAY( "\n");
    DISPLAY( "***** Warning  *****\n");
    DISPLAY( "Legacy arguments take precedence. Therefore : \n");
    DISPLAY( "---------------------------------\n");
    DISPLAY( "          %s -hc filename\n", exeName);
    DISPLAY( "means 'compress filename in high compression mode'\n");
    DISPLAY( "It is not equivalent to :\n");
    DISPLAY( "          %s -h -c filename\n", exeName);
    DISPLAY( "which would display help text and exit\n");
#endif /* ENABLE_LZ4C_LEGACY_OPTIONS */
    return 0;
}

static int badusage(const char* exeName)
{
    DISPLAYLEVEL(1, "Incorrect parameters\n");
    if (displayLevel >= 1) usage(exeName);
    exit(1);
}


static void waitEnter(void)
{
    DISPLAY("Press enter to continue...\n");
    (void)getchar();
}

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)] == '.');
}

/*! 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 result can overflow if digit string > MAX_UINT */
static unsigned readU32FromChar(const char** stringPtr)
{
    unsigned result = 0;
    while ((**stringPtr >='0') && (**stringPtr <='9'))
        result *= 10, result += **stringPtr - '0', (*stringPtr)++ ;
    if ((**stringPtr=='K') || (**stringPtr=='M')) {
        result <<= 10;
        if (**stringPtr=='M') result <<= 10;
        (*stringPtr)++ ;
        if (**stringPtr=='i') (*stringPtr)++;
        if (**stringPtr=='B') (*stringPtr)++;
    }
    return result;
}

typedef enum { om_auto, om_compress, om_decompress, om_test, om_bench } operationMode_e;

int main(int argc, const char** argv)
{
    int i,
        cLevel=1,
        cLevelLast=1,
        legacy_format=0,
        forceStdout=0,
        main_pause=0,
        multiple_inputs=0,
        all_arguments_are_files=0,
        operationResult=0;
    operationMode_e mode = om_auto;
    const char* input_filename = NULL;
    const char* output_filename= NULL;
    char* dynNameSpace = NULL;
    const char** inFileNames = (const char**) calloc(argc, sizeof(char*));
    unsigned ifnIdx=0;
    const char nullOutput[] = NULL_OUTPUT;
    const char extension[] = LZ4_EXTENSION;
    size_t blockSize = LZ4IO_setBlockSizeID(LZ4_BLOCKSIZEID_DEFAULT);
    const char* const exeName = lastNameFromPath(argv[0]);
#ifdef UTIL_HAS_CREATEFILELIST
    const char** extendedFileList = NULL;
    char* fileNamesBuf = NULL;
    unsigned fileNamesNb, recursive=0;
#endif

    /* Init */
    if (inFileNames==NULL) {
        DISPLAY("Allocation error : not enough memory \n");
        return 1;
    }
    inFileNames[0] = stdinmark;
    LZ4IO_setOverwrite(0);

    /* lz4cat predefined behavior */
    if (exeNameMatch(exeName, LZ4CAT)) {
        mode = om_decompress;
        LZ4IO_setOverwrite(1);
        LZ4IO_setRemoveSrcFile(0);
        forceStdout=1;
        output_filename=stdoutmark;
        displayLevel=1;
        multiple_inputs=1;
    }
    if (exeNameMatch(exeName, UNLZ4)) { mode = om_decompress; }

    /* command switches */
    for(i=1; i<argc; i++) {
        const char* argument = argv[i];

        if(!argument) continue;   /* Protection if argument empty */

        /* Short commands (note : aggregated short commands are allowed) */
        if (!all_arguments_are_files && argument[0]=='-') {
            /* '-' means stdin/stdout */
            if (argument[1]==0) {
                if (!input_filename) input_filename=stdinmark;
                else output_filename=stdoutmark;
                continue;
            }

            /* long commands (--long-word) */
            if (argument[1]=='-') {
                if (!strcmp(argument,  "--")) { all_arguments_are_files = 1; continue; }
                if (!strcmp(argument,  "--compress")) { mode = om_compress; continue; }
                if ((!strcmp(argument, "--decompress"))
                    || (!strcmp(argument, "--uncompress"))) { mode = om_decompress; continue; }
                if (!strcmp(argument,  "--multiple")) { multiple_inputs = 1; continue; }
                if (!strcmp(argument,  "--test")) { mode = om_test; continue; }
                if (!strcmp(argument,  "--force")) { LZ4IO_setOverwrite(1); continue; }
                if (!strcmp(argument,  "--no-force")) { LZ4IO_setOverwrite(0); continue; }
                if ((!strcmp(argument, "--stdout"))
                    || (!strcmp(argument, "--to-stdout"))) { forceStdout=1; output_filename=stdoutmark; continue; }
                if (!strcmp(argument,  "--frame-crc")) { LZ4IO_setStreamChecksumMode(1); continue; }
                if (!strcmp(argument,  "--no-frame-crc")) { LZ4IO_setStreamChecksumMode(0); continue; }
                if (!strcmp(argument,  "--content-size")) { LZ4IO_setContentSize(1); continue; }
                if (!strcmp(argument,  "--no-content-size")) { LZ4IO_setContentSize(0); continue; }
                if (!strcmp(argument,  "--sparse")) { LZ4IO_setSparseFile(2); continue; }
                if (!strcmp(argument,  "--no-sparse")) { LZ4IO_setSparseFile(0); continue; }
                if (!strcmp(argument,  "--verbose")) { displayLevel++; continue; }
                if (!strcmp(argument,  "--quiet")) { if (displayLevel) displayLevel--; continue; }
                if (!strcmp(argument,  "--version")) { DISPLAY(WELCOME_MESSAGE); return 0; }
                if (!strcmp(argument,  "--help")) { usage_advanced(exeName); goto _cleanup; }
                if (!strcmp(argument,  "--keep")) { LZ4IO_setRemoveSrcFile(0); continue; }   /* keep source file (default) */
                if (!strcmp(argument,  "--rm")) { LZ4IO_setRemoveSrcFile(1); continue; }
            }

            while (argument[1]!=0) {
                argument ++;

#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
                /* Legacy arguments (-c0, -c1, -hc, -y, -s) */
                if ((argument[0]=='c') && (argument[1]=='0')) { cLevel=0; argument++; continue; }  /* -c0 (fast compression) */
                if ((argument[0]=='c') && (argument[1]=='1')) { cLevel=9; argument++; continue; }  /* -c1 (high compression) */
                if ((argument[0]=='h') && (argument[1]=='c')) { cLevel=9; argument++; continue; }  /* -hc (high compression) */
                if (*argument=='y') { LZ4IO_setOverwrite(1); continue; }                           /* -y (answer 'yes' to overwrite permission) */
#endif /* ENABLE_LZ4C_LEGACY_OPTIONS */

                if ((*argument>='0') && (*argument<='9')) {
                    cLevel = readU32FromChar(&argument);
                    argument--;
                    continue;
                }


                switch(argument[0])
                {
                    /* Display help */
                case 'V': DISPLAY(WELCOME_MESSAGE); goto _cleanup;   /* Version */
                case 'h': usage_advanced(exeName); goto _cleanup;
                case 'H': usage_longhelp(exeName); goto _cleanup;

                case 'e':
                    argument++;
                    cLevelLast = readU32FromChar(&argument);
                    argument--;
                    break;

                    /* Compression (default) */
                case 'z': mode = om_compress; break;

                    /* Use Legacy format (ex : Linux kernel compression) */
                case 'l': legacy_format = 1; blockSize = 8 MB; break;

                    /* Decoding */
                case 'd': mode = om_decompress; break;

                    /* Force stdout, even if stdout==console */
                case 'c': forceStdout=1; output_filename=stdoutmark; break;

                    /* Test integrity */
                case 't': mode = om_test; break;

                    /* Overwrite */
                case 'f': LZ4IO_setOverwrite(1); break;

                    /* Verbose mode */
                case 'v': displayLevel++; break;

                    /* Quiet mode */
                case 'q': if (displayLevel) displayLevel--; break;

                    /* keep source file (default anyway, so useless) (for xz/lzma compatibility) */
                case 'k': LZ4IO_setRemoveSrcFile(0); break;

                    /* Modify Block Properties */
                case 'B':
                    while (argument[1]!=0) {
                        int exitBlockProperties=0;
                        switch(argument[1])
                        {
                        case 'D': LZ4IO_setBlockMode(LZ4IO_blockLinked); argument++; break;
                        case 'X': LZ4IO_setBlockChecksumMode(1); argument ++; break;   /* disabled by default */
                        default :
                            if (argument[1] < '0' || argument[1] > '9') {
                                exitBlockProperties=1;
                                break;
                            } else {
                                unsigned B;
                                argument++;
                                B = readU32FromChar(&argument);
                                argument--;
                                if (B < 4) badusage(exeName);
                                if (B <= 7) {
                                    blockSize = LZ4IO_setBlockSizeID(B);
                                    BMK_SetBlockSize(blockSize);
                                    DISPLAYLEVEL(2, "using blocks of size %u KB \n", (U32)(blockSize>>10));
                                } else {
                                    if (B < 32) badusage(exeName);
                                    BMK_SetBlockSize(B);
                                    if (B >= 1024) {
                                        DISPLAYLEVEL(2, "bench: using blocks of size %u KB \n", (U32)(B>>10));
                                    } else {
                                        DISPLAYLEVEL(2, "bench: using blocks of size %u bytes \n", (U32)(B));
                                    }
                                }
                                break;
                            }
                        }
                        if (exitBlockProperties) break;
                    }
                    break;

                    /* Benchmark */
                case 'b': mode = om_bench; multiple_inputs=1;
                    break;

#ifdef UTIL_HAS_CREATEFILELIST
                    /* recursive */
                case 'r': recursive=1;
#endif
                    /* fall-through */
                    /* Treat non-option args as input files.  See https://code.google.com/p/lz4/issues/detail?id=151 */
                case 'm': multiple_inputs=1;
                    break;

                    /* Modify Nb Seconds (benchmark only) */
                case 'i':
                    {   unsigned iters;
                        argument++;
                        iters = readU32FromChar(&argument);
                        argument--;
                        BMK_setNotificationLevel(displayLevel);
                        BMK_SetNbSeconds(iters);   /* notification if displayLevel >= 3 */
                    }
                    break;

                    /* Pause at the end (hidden option) */
                case 'p': main_pause=1; break;

                    /* Specific commands for customized versions */
                EXTENDED_ARGUMENTS;

                    /* Unrecognised command */
                default : badusage(exeName);
                }
            }
            continue;
        }

        /* Store in *inFileNames[] if -m is used. */
        if (multiple_inputs) { inFileNames[ifnIdx++]=argument; continue; }

        /* Store first non-option arg in input_filename to preserve original cli logic. */
        if (!input_filename) { input_filename=argument; continue; }

        /* Second non-option arg in output_filename to preserve original cli logic. */
        if (!output_filename) {
            output_filename=argument;
            if (!strcmp (output_filename, nullOutput)) output_filename = nulmark;
            continue;
        }

        /* 3rd non-option arg should not exist */
        DISPLAYLEVEL(1, "Warning : %s won't be used ! Do you want multiple input files (-m) ? \n", argument);
    }

    DISPLAYLEVEL(3, WELCOME_MESSAGE);
#ifdef _POSIX_C_SOURCE
    DISPLAYLEVEL(4, "_POSIX_C_SOURCE defined: %ldL\n", (long) _POSIX_C_SOURCE);
#endif
#ifdef _POSIX_VERSION
    DISPLAYLEVEL(4, "_POSIX_VERSION defined: %ldL\n", (long) _POSIX_VERSION);
#endif
#ifdef PLATFORM_POSIX_VERSION
    DISPLAYLEVEL(4, "PLATFORM_POSIX_VERSION defined: %ldL\n", (long) PLATFORM_POSIX_VERSION);
#endif
#ifdef _FILE_OFFSET_BITS
    DISPLAYLEVEL(4, "_FILE_OFFSET_BITS defined: %ldL\n", (long) _FILE_OFFSET_BITS);
#endif
    if ((mode == om_compress) || (mode == om_bench)) DISPLAYLEVEL(4, "Blocks size : %u KB\n", (U32)(blockSize>>10));

    if (multiple_inputs) {
        input_filename = inFileNames[0];
#ifdef UTIL_HAS_CREATEFILELIST
        if (recursive) {  /* at this stage, filenameTable is a list of paths, which can contain both files and directories */
            extendedFileList = UTIL_createFileList(inFileNames, ifnIdx, &fileNamesBuf, &fileNamesNb);
            if (extendedFileList) {
                unsigned u;
                for (u=0; u<fileNamesNb; u++) DISPLAYLEVEL(4, "%u %s\n", u, extendedFileList[u]);
                free((void*)inFileNames);
                inFileNames = extendedFileList;
                ifnIdx = fileNamesNb;
            }
        }
#endif
    }

    /* benchmark and test modes */
    if (mode == om_bench) {
        BMK_setNotificationLevel(displayLevel);
        operationResult = BMK_benchFiles(inFileNames, ifnIdx, cLevel, cLevelLast);
        goto _cleanup;
    }

    if (mode == om_test) {
        LZ4IO_setTestMode(1);
        output_filename = nulmark;
        mode = om_decompress;   /* defer to decompress */
    }

    /* compress or decompress */
    if (!input_filename) input_filename = stdinmark;
    /* Check if input is defined as console; trigger an error in this case */
    if (!strcmp(input_filename, stdinmark) && IS_CONSOLE(stdin) ) {
        DISPLAYLEVEL(1, "refusing to read from a console\n");
        exit(1);
    }
    /* if input==stdin and no output defined, stdout becomes default output */
    if (!strcmp(input_filename, stdinmark) && !output_filename)
        output_filename = stdoutmark;

    /* No output filename ==> try to select one automatically (when possible) */
    while ((!output_filename) && (multiple_inputs==0)) {
        if (!IS_CONSOLE(stdout)) { output_filename=stdoutmark; break; }   /* Default to stdout whenever possible (i.e. not a console) */
        if (mode == om_auto) {  /* auto-determine compression or decompression, based on file extension */
            size_t const inSize  = strlen(input_filename);
            size_t const extSize = strlen(LZ4_EXTENSION);
            size_t const extStart= (inSize > extSize) ? inSize-extSize : 0;
            if (!strcmp(input_filename+extStart, LZ4_EXTENSION)) mode = om_decompress;
            else mode = om_compress;
        }
        if (mode == om_compress) {   /* compression to file */
            size_t const l = strlen(input_filename);
            dynNameSpace = (char*)calloc(1,l+5);
            if (dynNameSpace==NULL) { perror(exeName); exit(1); }
            strcpy(dynNameSpace, input_filename);
            strcat(dynNameSpace, LZ4_EXTENSION);
            output_filename = dynNameSpace;
            DISPLAYLEVEL(2, "Compressed filename will be : %s \n", output_filename);
            break;
        }
        if (mode == om_decompress) {/* decompression to file (automatic name will work only if input filename has correct format extension) */
            size_t outl;
            size_t const inl = strlen(input_filename);
            dynNameSpace = (char*)calloc(1,inl+1);
            if (dynNameSpace==NULL) { perror(exeName); exit(1); }
            strcpy(dynNameSpace, input_filename);
            outl = inl;
            if (inl>4)
                while ((outl >= inl-4) && (input_filename[outl] ==  extension[outl-inl+4])) dynNameSpace[outl--]=0;
            if (outl != inl-5) { DISPLAYLEVEL(1, "Cannot determine an output filename\n"); badusage(exeName); }
            output_filename = dynNameSpace;
            DISPLAYLEVEL(2, "Decoding file %s \n", output_filename);
        }
        break;
    }

    /* Check if output is defined as console; trigger an error in this case */
    if (!output_filename) output_filename = "*\\dummy^!//";
    if (!strcmp(output_filename,stdoutmark) && IS_CONSOLE(stdout) && !forceStdout) {
        DISPLAYLEVEL(1, "refusing to write to console without -c\n");
        exit(1);
    }
    /* Downgrade notification level in stdout and multiple file mode */
    if (!strcmp(output_filename,stdoutmark) && (displayLevel==2)) displayLevel=1;
    if ((multiple_inputs) && (displayLevel==2)) displayLevel=1;

    /* IO Stream/File */
    LZ4IO_setNotificationLevel(displayLevel);
    if (ifnIdx == 0) multiple_inputs = 0;
    if (mode == om_decompress) {
        if (multiple_inputs)
            operationResult = LZ4IO_decompressMultipleFilenames(inFileNames, ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION);
        else
            operationResult = DEFAULT_DECOMPRESSOR(input_filename, output_filename);
    } else {   /* compression is default action */
        if (legacy_format) {
            DISPLAYLEVEL(3, "! Generating compressed LZ4 using Legacy format (deprecated) ! \n");
            LZ4IO_compressFilename_Legacy(input_filename, output_filename, cLevel);
        } else {
            if (multiple_inputs)
                operationResult = LZ4IO_compressMultipleFilenames(inFileNames, ifnIdx, LZ4_EXTENSION, cLevel);
            else
                operationResult = DEFAULT_COMPRESSOR(input_filename, output_filename, cLevel);
        }
    }

_cleanup:
    if (main_pause) waitEnter();
    if (dynNameSpace) free(dynNameSpace);
#ifdef UTIL_HAS_CREATEFILELIST
    if (extendedFileList)
        UTIL_freeFileList(extendedFileList, fileNamesBuf);
    else
#endif
        free((void*)inFileNames);
    return operationResult;
}