summaryrefslogtreecommitdiffstats
path: root/programs/lz4io.c
blob: 7617cff133dd2b006eabdee5f6b2c1a850e8d1ba (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
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
/*
  LZ4io.c - LZ4 File/Stream Interface
  Copyright (C) Yann Collet 2011-2014
  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 : http://code.google.com/p/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 code of the LZ4 library.
  - The license of LZ4 library is BSD.
  - The license of xxHash library is BSD.
  - The license of this source file is GPLv2.
*/

//**************************************
// Compiler Options
//**************************************
#ifdef _MSC_VER    /* Visual Studio */
#  define FORCE_INLINE static __forceinline
#  define _CRT_SECURE_NO_WARNINGS
#  define _CRT_SECURE_NO_DEPRECATE     // VS2005
#  pragma warning(disable : 4127)      // disable: C4127: conditional expression is constant
#else
#  ifdef __GNUC__
#    define FORCE_INLINE static inline __attribute__((always_inline))
#  else
#    define FORCE_INLINE static inline
#  endif
#endif

#define _FILE_OFFSET_BITS 64   // Large file support on 32-bits unix
#define _POSIX_SOURCE 1        // for fileno() within <stdio.h> on unix


//****************************
// Includes
//****************************
#include <stdio.h>    // fprintf, fopen, fread, _fileno, stdin, stdout
#include <stdlib.h>   // malloc
#include <string.h>   // strcmp, strlen
#include <time.h>     // clock
#include "lz4io.h"
#include "lz4.h"
#include "lz4hc.h"
#include "xxhash.h"


//****************************
// OS-specific Includes
//****************************
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>    // _O_BINARY
#  include <io.h>       // _setmode, _isatty
#  ifdef __MINGW32__
   int _fileno(FILE *stream);   // MINGW somehow forgets to include this windows declaration into <stdio.h>
#  endif
#  define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY)
#  define IS_CONSOLE(stdStream) _isatty(_fileno(stdStream))
#else
#  include <unistd.h>   // isatty
#  define SET_BINARY_MODE(file)
#  define IS_CONSOLE(stdStream) isatty(fileno(stdStream))
#endif


//**************************************
// Compiler-specific functions
//**************************************
#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)

#if defined(_MSC_VER)    // Visual Studio
#  define swap32 _byteswap_ulong
#elif GCC_VERSION >= 403
#  define swap32 __builtin_bswap32
#else
  static inline unsigned int swap32(unsigned int x)
  {
    return ((x << 24) & 0xff000000 ) |
           ((x <<  8) & 0x00ff0000 ) |
           ((x >>  8) & 0x0000ff00 ) |
           ((x >> 24) & 0x000000ff );
  }
#endif


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

#define _1BIT  0x01
#define _2BITS 0x03
#define _3BITS 0x07
#define _4BITS 0x0F
#define _8BITS 0xFF

#define MAGICNUMBER_SIZE   4
#define LZ4S_MAGICNUMBER   0x184D2204
#define LZ4S_SKIPPABLE0    0x184D2A50
#define LZ4S_SKIPPABLEMASK 0xFFFFFFF0
#define LEGACY_MAGICNUMBER 0x184C2102

#define CACHELINE 64
#define LEGACY_BLOCKSIZE   (8 MB)
#define MIN_STREAM_BUFSIZE (192 KB)
#define LZ4S_BLOCKSIZEID_DEFAULT 7
#define LZ4S_CHECKSUM_SEED 0
#define LZ4S_EOS 0
#define LZ4S_MAXHEADERSIZE (MAGICNUMBER_SIZE+2+8+4+1)


//**************************************
// Architecture Macros
//**************************************
static const int one = 1;
#define CPU_LITTLE_ENDIAN   (*(char*)(&one))
#define CPU_BIG_ENDIAN      (!CPU_LITTLE_ENDIAN)
#define LITTLE_ENDIAN_32(i) (CPU_LITTLE_ENDIAN?(i):swap32(i))


//**************************************
// Macros
//**************************************
#define DISPLAY(...)         fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (displayLevel>=l) { DISPLAY(__VA_ARGS__); }


//**************************************
// Local Parameters
//**************************************
static int displayLevel = 0;   // 0 : no display  // 1: errors  // 2 : + result + interaction + warnings ;  // 3 : + progression;  // 4 : + information
static int overwrite = 1;
static int globalBlockSizeId = LZ4S_BLOCKSIZEID_DEFAULT;
static int blockChecksum = 0;
static int streamChecksum = 1;
static int blockIndependence = 1;

static const int minBlockSizeID = 4;
static const int maxBlockSizeID = 7;

//**************************************
// 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   compress_file
#define DEFAULT_DECOMPRESSOR decodeLZ4S


/* ************************************************** */
/* ****************** Parameters ******************** */
/* ************************************************** */

/* Default setting : overwrite = 1; return : overwrite mode (0/1) */
int LZ4IO_setOverwrite(int yes)
{
   overwrite = (yes!=0);
   return overwrite;
}

/* blockSizeID : valid values : 4-5-6-7 */
int LZ4IO_setBlockSizeID(int bsid)
{
    static const int blockSizeTable[] = { 64 KB, 256 KB, 1 MB, 4 MB };
    if ((bsid < minBlockSizeID) || (bsid > maxBlockSizeID)) return -1;
    globalBlockSizeId = bsid;
    return blockSizeTable[globalBlockSizeId-minBlockSizeID];
}


int LZ4IO_setBlockMode(blockMode_t blockMode)
{
    blockIndependence = (blockMode == independentBlocks);
    return blockIndependence;
}


/* Default setting : no checksum */
int LZ4IO_setBlockChecksumMode(int xxhash)
{
    blockChecksum = (xxhash != 0);
    return blockChecksum;
}


/* Default setting : checksum enabled */
int LZ4IO_setStreamChecksumMode(int xxhash)
{
    streamChecksum = (xxhash != 0);
    return streamChecksum;
}


/* Default setting : 0 (no notification) */
int LZ4IO_setNotificationLevel(int level)
{
    displayLevel = level;
    return displayLevel;
}



/* ************************************************************************ */
/* ********************** LZ4 File / Stream compression ******************* */
/* ************************************************************************ */

static int          LZ4S_GetBlockSize_FromBlockId (int id) { return (1 << (8 + (2 * id))); }
static unsigned int LZ4S_GetCheckBits_FromXXH (unsigned int xxh) { return (xxh >> 8) & _8BITS; }
static int          LZ4S_isSkippableMagicNumber(unsigned int magic) { return (magic & LZ4S_SKIPPABLEMASK) == LZ4S_SKIPPABLE0; }


static int get_fileHandle(char* input_filename, char* output_filename, FILE** pfinput, FILE** pfoutput)
{

    if (!strcmp (input_filename, stdinmark))
    {
        DISPLAYLEVEL(4,"Using stdin for input\n");
        *pfinput = stdin;
        SET_BINARY_MODE(stdin);
    }
    else
    {
        *pfinput = fopen(input_filename, "rb");
    }

    if (!strcmp (output_filename, stdoutmark))
    {
        DISPLAYLEVEL(4,"Using stdout for output\n");
        *pfoutput = stdout;
        SET_BINARY_MODE(stdout);
    }
    else
    {
        // Check if destination file already exists
        *pfoutput=0;
        if (output_filename != nulmark) *pfoutput = fopen( output_filename, "rb" );
        if (*pfoutput!=0)
        {
            fclose(*pfoutput);
            if (!overwrite)
            {
                char ch;
                DISPLAYLEVEL(2, "Warning : %s already exists\n", output_filename);
                DISPLAYLEVEL(2, "Overwrite ? (Y/N) : ");
                if (displayLevel <= 1) EXM_THROW(11, "Operation aborted : %s already exists", output_filename);   // No interaction possible
                ch = (char)getchar();
                if ((ch!='Y') && (ch!='y')) EXM_THROW(11, "Operation aborted : %s already exists", output_filename);
            }
        }
        *pfoutput = fopen( output_filename, "wb" );
    }

    if ( *pfinput==0 ) EXM_THROW(12, "Pb opening %s", input_filename);
    if ( *pfoutput==0) EXM_THROW(13, "Pb opening %s", output_filename);

    return 0;
}


// LZ4IO_compressFilename_Legacy : This function is "hidden" (not published in .h)
// Its purpose is to generate compressed streams using the old 'legacy' format
int LZ4IO_compressFilename_Legacy(char* input_filename, char* output_filename, int compressionlevel)
{
    int (*compressionFunction)(const char*, char*, int);
    unsigned long long filesize = 0;
    unsigned long long compressedfilesize = MAGICNUMBER_SIZE;
    char* in_buff;
    char* out_buff;
    FILE* finput;
    FILE* foutput;
    clock_t start, end;
    size_t sizeCheck;


    // Init
    if (compressionlevel < 3) compressionFunction = LZ4_compress; else compressionFunction = LZ4_compressHC;
    start = clock();
    get_fileHandle(input_filename, output_filename, &finput, &foutput);
    if ((displayLevel==2) && (compressionlevel==1)) displayLevel=3;

    // Allocate Memory
    in_buff = (char*)malloc(LEGACY_BLOCKSIZE);
    out_buff = (char*)malloc(LZ4_compressBound(LEGACY_BLOCKSIZE));
    if (!in_buff || !out_buff) EXM_THROW(21, "Allocation error : not enough memory");

    // Write Archive Header
    *(unsigned int*)out_buff = LITTLE_ENDIAN_32(LEGACY_MAGICNUMBER);
    sizeCheck = fwrite(out_buff, 1, MAGICNUMBER_SIZE, foutput);
    if (sizeCheck!=MAGICNUMBER_SIZE) EXM_THROW(22, "Write error : cannot write header");

    // Main Loop
    while (1)
    {
        unsigned int outSize;
        // Read Block
        int inSize = (int) fread(in_buff, (size_t)1, (size_t)LEGACY_BLOCKSIZE, finput);
        if( inSize<=0 ) break;
        filesize += inSize;
        DISPLAYLEVEL(3, "\rRead : %i MB   ", (int)(filesize>>20));

        // Compress Block
        outSize = compressionFunction(in_buff, out_buff+4, inSize);
        compressedfilesize += outSize+4;
        DISPLAYLEVEL(3, "\rRead : %i MB  ==> %.2f%%   ", (int)(filesize>>20), (double)compressedfilesize/filesize*100);

        // Write Block
        * (unsigned int*) out_buff = LITTLE_ENDIAN_32(outSize);
        sizeCheck = fwrite(out_buff, 1, outSize+4, foutput);
        if (sizeCheck!=(size_t)(outSize+4)) EXM_THROW(23, "Write error : cannot write compressed block");
    }

    // Status
    end = clock();
    DISPLAYLEVEL(2, "\r%79s\r", "");
    DISPLAYLEVEL(2,"Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
        (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100);
    {
        double seconds = (double)(end - start)/CLOCKS_PER_SEC;
        DISPLAYLEVEL(4,"Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024);
    }

    // Close & Free
    free(in_buff);
    free(out_buff);
    fclose(finput);
    fclose(foutput);

    return 0;
}


static void* LZ4IO_LZ4_createStream (const char* inputBuffer)
{
    (void)inputBuffer;
    return LZ4_createStream();
}

static int LZ4IO_LZ4_compress_limitedOutput_continue (void* ctx, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
{
    (void)compressionLevel;
    return LZ4_compress_limitedOutput_continue(ctx, source, dest, inputSize, maxOutputSize);
}

static int LZ4IO_LZ4_saveDict (void* LZ4_stream, char* safeBuffer, int dictSize)
{
    return LZ4_saveDict ((LZ4_stream_t*) LZ4_stream, safeBuffer, dictSize);
}

static int LZ4IO_LZ4_slideInputBufferHC (void* ctx, char* buffer, int size)
{
    (void)size; (void)buffer;
    LZ4_slideInputBufferHC (ctx);
    return 1;
}


static int compress_file_blockDependency(char* input_filename, char* output_filename, int compressionlevel)
{
    void* (*initFunction)       (const char*);
    int   (*compressionFunction)(void*, const char*, char*, int, int, int);
    int   (*nextBlockFunction)  (void*, char*, int);
    int   (*freeFunction)       (void*);
    void* ctx;
    unsigned long long filesize = 0;
    unsigned long long compressedfilesize = 0;
    unsigned int checkbits;
    char* in_buff, *in_blockStart;
    char* out_buff;
    FILE* finput;
    FILE* foutput;
    clock_t start, end;
    unsigned int blockSize, inputBufferSize;
    size_t sizeCheck, header_size;
    void* streamChecksumState=NULL;

    // Init
    start = clock();
    if ((displayLevel==2) && (compressionlevel>=3)) displayLevel=3;

    if (compressionlevel<3)
    {
        initFunction = LZ4IO_LZ4_createStream;
        compressionFunction = LZ4IO_LZ4_compress_limitedOutput_continue;
        nextBlockFunction = LZ4IO_LZ4_saveDict;
        freeFunction = LZ4_free;
    }
    else
    {
        initFunction = LZ4_createHC;
        compressionFunction = LZ4_compressHC2_limitedOutput_continue;
        nextBlockFunction = LZ4IO_LZ4_slideInputBufferHC;
        freeFunction = LZ4_free;
    }

    get_fileHandle(input_filename, output_filename, &finput, &foutput);
    blockSize = LZ4S_GetBlockSize_FromBlockId (globalBlockSizeId);

    // Allocate Memory
    inputBufferSize = 64 KB + blockSize;
    in_buff  = (char*)malloc(inputBufferSize);
    out_buff = (char*)malloc(blockSize+CACHELINE);
    if (!in_buff || !out_buff) EXM_THROW(31, "Allocation error : not enough memory");
    in_blockStart = in_buff + 64 KB;
    if (compressionlevel>=3) in_blockStart = in_buff;
    if (streamChecksum) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);
    ctx = initFunction(in_buff);

    // Write Archive Header
    *(unsigned int*)out_buff = LITTLE_ENDIAN_32(LZ4S_MAGICNUMBER);   // Magic Number, in Little Endian convention
    *(out_buff+4)  = (1 & _2BITS) << 6 ;                             // Version('01')
    *(out_buff+4) |= (blockIndependence & _1BIT) << 5;
    *(out_buff+4) |= (blockChecksum & _1BIT) << 4;
    *(out_buff+4) |= (streamChecksum & _1BIT) << 2;
    *(out_buff+5)  = (char)((globalBlockSizeId & _3BITS) << 4);
    checkbits = XXH32((out_buff+4), 2, LZ4S_CHECKSUM_SEED);
    checkbits = LZ4S_GetCheckBits_FromXXH(checkbits);
    *(out_buff+6)  = (unsigned char) checkbits;
    header_size = 7;
    sizeCheck = fwrite(out_buff, 1, header_size, foutput);
    if (sizeCheck!=header_size) EXM_THROW(32, "Write error : cannot write header");
    compressedfilesize += header_size;

    // Main Loop
    while (1)
    {
        unsigned int outSize;
        unsigned int inSize;

        // Read Block
        inSize = (unsigned int) fread(in_blockStart, (size_t)1, (size_t)blockSize, finput);
        if( inSize==0 ) break;   // No more input : end of compression
        filesize += inSize;
        DISPLAYLEVEL(3, "\rRead : %i MB   ", (int)(filesize>>20));
        if (streamChecksum) XXH32_update(streamChecksumState, in_blockStart, inSize);

        // Compress Block
        outSize = compressionFunction(ctx, in_blockStart, out_buff+4, inSize, inSize-1, compressionlevel);
        if (outSize > 0) compressedfilesize += outSize+4; else compressedfilesize += inSize+4;
        if (blockChecksum) compressedfilesize+=4;
        DISPLAYLEVEL(3, "==> %.2f%%   ", (double)compressedfilesize/filesize*100);

        // Write Block
        if (outSize > 0)
        {
            int sizeToWrite;
            * (unsigned int*) out_buff = LITTLE_ENDIAN_32(outSize);
            if (blockChecksum)
            {
                unsigned int checksum = XXH32(out_buff+4, outSize, LZ4S_CHECKSUM_SEED);
                * (unsigned int*) (out_buff+4+outSize) = LITTLE_ENDIAN_32(checksum);
            }
            sizeToWrite = 4 + outSize + (4*blockChecksum);
            sizeCheck = fwrite(out_buff, 1, sizeToWrite, foutput);
            if (sizeCheck!=(size_t)(sizeToWrite)) EXM_THROW(33, "Write error : cannot write compressed block");
        }
        else   // Copy Original
        {
            * (unsigned int*) out_buff = LITTLE_ENDIAN_32(inSize|0x80000000);   // Add Uncompressed flag
            sizeCheck = fwrite(out_buff, 1, 4, foutput);
            if (sizeCheck!=(size_t)(4)) EXM_THROW(34, "Write error : cannot write block header");
            sizeCheck = fwrite(in_blockStart, 1, inSize, foutput);
            if (sizeCheck!=(size_t)(inSize)) EXM_THROW(35, "Write error : cannot write block");
            if (blockChecksum)
            {
                unsigned int checksum = XXH32(in_blockStart, inSize, LZ4S_CHECKSUM_SEED);
                * (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
                sizeCheck = fwrite(out_buff, 1, 4, foutput);
                if (sizeCheck!=(size_t)(4)) EXM_THROW(36, "Write error : cannot write block checksum");
            }
        }
        {
            size_t sizeToMove = 64 KB;
            if (inSize < 64 KB) sizeToMove = inSize;
            nextBlockFunction(ctx, in_blockStart - sizeToMove, (int)sizeToMove);
            if (compressionlevel>=3) in_blockStart = in_buff + 64 KB;
        }
    }

    // End of Stream mark
    * (unsigned int*) out_buff = LZ4S_EOS;
    sizeCheck = fwrite(out_buff, 1, 4, foutput);
    if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write end of stream");
    compressedfilesize += 4;
    if (streamChecksum)
    {
        unsigned int checksum = XXH32_digest(streamChecksumState);
        * (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
        sizeCheck = fwrite(out_buff, 1, 4, foutput);
        if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write stream checksum");
        compressedfilesize += 4;
    }

    // Status
    end = clock();
    DISPLAYLEVEL(2, "\r%79s\r", "");
    DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
        (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100);
    {
        double seconds = (double)(end - start)/CLOCKS_PER_SEC;
        DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024);
    }

    // Close & Free
    freeFunction(ctx);
    free(in_buff);
    free(out_buff);
    fclose(finput);
    fclose(foutput);

    return 0;
}


FORCE_INLINE int LZ4_compress_limitedOutput_local(const char* src, char* dst, int size, int maxOut, int clevel)
{ (void)clevel; return LZ4_compress_limitedOutput(src, dst, size, maxOut); }

int LZ4IO_compressFilename(char* input_filename, char* output_filename, int compressionLevel)
{
    int (*compressionFunction)(const char*, char*, int, int, int);
    unsigned long long filesize = 0;
    unsigned long long compressedfilesize = 0;
    unsigned int checkbits;
    char* in_buff;
    char* out_buff;
    char* headerBuffer;
    FILE* finput;
    FILE* foutput;
    clock_t start, end;
    int blockSize;
    size_t sizeCheck, header_size, readSize;
    void* streamChecksumState=NULL;

    // Branch out
    if (blockIndependence==0) return compress_file_blockDependency(input_filename, output_filename, compressionLevel);

    // Init
    start = clock();
    if ((displayLevel==2) && (compressionLevel>=3)) displayLevel=3;
    if (compressionLevel <= 3) compressionFunction = LZ4_compress_limitedOutput_local;
    else { compressionFunction = LZ4_compressHC2_limitedOutput; }
    get_fileHandle(input_filename, output_filename, &finput, &foutput);
    blockSize = LZ4S_GetBlockSize_FromBlockId (globalBlockSizeId);

    // Allocate Memory
    in_buff  = (char*)malloc(blockSize);
    out_buff = (char*)malloc(blockSize+CACHELINE);
    headerBuffer = (char*)malloc(LZ4S_MAXHEADERSIZE);
    if (!in_buff || !out_buff || !(headerBuffer)) EXM_THROW(31, "Allocation error : not enough memory");
    if (streamChecksum) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);

    // Write Archive Header
    *(unsigned int*)headerBuffer = LITTLE_ENDIAN_32(LZ4S_MAGICNUMBER);   // Magic Number, in Little Endian convention
    *(headerBuffer+4)  = (1 & _2BITS) << 6 ;                             // Version('01')
    *(headerBuffer+4) |= (blockIndependence & _1BIT) << 5;
    *(headerBuffer+4) |= (blockChecksum & _1BIT) << 4;
    *(headerBuffer+4) |= (streamChecksum & _1BIT) << 2;
    *(headerBuffer+5)  = (char)((globalBlockSizeId & _3BITS) << 4);
    checkbits = XXH32((headerBuffer+4), 2, LZ4S_CHECKSUM_SEED);
    checkbits = LZ4S_GetCheckBits_FromXXH(checkbits);
    *(headerBuffer+6)  = (unsigned char) checkbits;
    header_size = 7;

    // Write header
    sizeCheck = fwrite(headerBuffer, 1, header_size, foutput);
    if (sizeCheck!=header_size) EXM_THROW(32, "Write error : cannot write header");
    compressedfilesize += header_size;

    // read first block
    readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput);

    // Main Loop
    while (readSize>0)
    {
        unsigned int outSize;

        filesize += readSize;
        DISPLAYLEVEL(3, "\rRead : %i MB   ", (int)(filesize>>20));
        if (streamChecksum) XXH32_update(streamChecksumState, in_buff, (int)readSize);

        // Compress Block
        outSize = compressionFunction(in_buff, out_buff+4, (int)readSize, (int)readSize-1, compressionLevel);
        if (outSize > 0) compressedfilesize += outSize+4; else compressedfilesize += readSize+4;
        if (blockChecksum) compressedfilesize+=4;
        DISPLAYLEVEL(3, "==> %.2f%%   ", (double)compressedfilesize/filesize*100);

        // Write Block
        if (outSize > 0)
        {
            int sizeToWrite;
            * (unsigned int*) out_buff = LITTLE_ENDIAN_32(outSize);
            if (blockChecksum)
            {
                unsigned int checksum = XXH32(out_buff+4, outSize, LZ4S_CHECKSUM_SEED);
                * (unsigned int*) (out_buff+4+outSize) = LITTLE_ENDIAN_32(checksum);
            }
            sizeToWrite = 4 + outSize + (4*blockChecksum);
            sizeCheck = fwrite(out_buff, 1, sizeToWrite, foutput);
            if (sizeCheck!=(size_t)(sizeToWrite)) EXM_THROW(33, "Write error : cannot write compressed block");
        }
        else  // Copy Original Uncompressed
        {
            * (unsigned int*) out_buff = LITTLE_ENDIAN_32(((unsigned long)readSize)|0x80000000);   // Add Uncompressed flag
            sizeCheck = fwrite(out_buff, 1, 4, foutput);
            if (sizeCheck!=(size_t)(4)) EXM_THROW(34, "Write error : cannot write block header");
            sizeCheck = fwrite(in_buff, 1, readSize, foutput);
            if (sizeCheck!=readSize) EXM_THROW(35, "Write error : cannot write block");
            if (blockChecksum)
            {
                unsigned int checksum = XXH32(in_buff, (int)readSize, LZ4S_CHECKSUM_SEED);
                * (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
                sizeCheck = fwrite(out_buff, 1, 4, foutput);
                if (sizeCheck!=(size_t)(4)) EXM_THROW(36, "Write error : cannot write block checksum");
            }
        }

        // Read next block
        readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput);
    }

    // End of Stream mark
    * (unsigned int*) out_buff = LZ4S_EOS;
    sizeCheck = fwrite(out_buff, 1, 4, foutput);
    if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write end of stream");
    compressedfilesize += 4;
    if (streamChecksum)
    {
        unsigned int checksum = XXH32_digest(streamChecksumState);
        * (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
        sizeCheck = fwrite(out_buff, 1, 4, foutput);
        if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write stream checksum");
        compressedfilesize += 4;
    }

    // Close & Free
    free(in_buff);
    free(out_buff);
    free(headerBuffer);
    fclose(finput);
    fclose(foutput);

    // Final Status
    end = clock();
    DISPLAYLEVEL(2, "\r%79s\r", "");
    DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
        (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100);
    {
        double seconds = (double)(end - start)/CLOCKS_PER_SEC;
        DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024);
    }

    return 0;
}


/* ********************************************************************* */
/* ********************** LZ4 File / Stream decoding ******************* */
/* ********************************************************************* */

static unsigned long long decodeLegacyStream(FILE* finput, FILE* foutput)
{
    unsigned long long filesize = 0;
    char* in_buff;
    char* out_buff;
    unsigned int blockSize;


    // Allocate Memory
    in_buff = (char*)malloc(LZ4_compressBound(LEGACY_BLOCKSIZE));
    out_buff = (char*)malloc(LEGACY_BLOCKSIZE);
    if (!in_buff || !out_buff) EXM_THROW(51, "Allocation error : not enough memory");

    // Main Loop
    while (1)
    {
        int decodeSize;
        size_t sizeCheck;

        // Block Size
        sizeCheck = fread(&blockSize, 1, 4, finput);
        if (sizeCheck==0) break;                   // Nothing to read : file read is completed
        blockSize = LITTLE_ENDIAN_32(blockSize);   // Convert to Little Endian
        if (blockSize > LZ4_COMPRESSBOUND(LEGACY_BLOCKSIZE))
        {   // Cannot read next block : maybe new stream ?
            fseek(finput, -4, SEEK_CUR);
            break;
        }

        // Read Block
        sizeCheck = fread(in_buff, 1, blockSize, finput);

        // Decode Block
        decodeSize = LZ4_decompress_safe(in_buff, out_buff, blockSize, LEGACY_BLOCKSIZE);
        if (decodeSize < 0) EXM_THROW(52, "Decoding Failed ! Corrupted input detected !");
        filesize += decodeSize;

        // Write Block
        sizeCheck = fwrite(out_buff, 1, decodeSize, foutput);
        if (sizeCheck != (size_t)decodeSize) EXM_THROW(53, "Write error : cannot write decoded block into output\n");
    }

    // Free
    free(in_buff);
    free(out_buff);

    return filesize;
}


static unsigned long long decodeLZ4S(FILE* finput, FILE* foutput)
{
    unsigned long long filesize = 0;
    char* in_buff;
    char* out_buff, *out_start, *out_end;
    unsigned char descriptor[LZ4S_MAXHEADERSIZE];
    size_t nbReadBytes;
    int decodedBytes=0;
    unsigned int maxBlockSize;
    size_t sizeCheck;
    int blockChecksumFlag, streamChecksumFlag, blockIndependenceFlag;
    void* streamChecksumState=NULL;
    int (*decompressionFunction)(void* ctx, const char* src, char* dst, int cSize, int maxOSize) = LZ4_decompress_safe_continue;
    LZ4_streamDecode_t ctx;

    // init
    memset(&ctx, 0, sizeof(ctx));

    // Decode stream descriptor
    nbReadBytes = fread(descriptor, 1, 3, finput);
    if (nbReadBytes != 3) EXM_THROW(61, "Unreadable header");
    {
        int version       = (descriptor[0] >> 6) & _2BITS;
        int streamSize    = (descriptor[0] >> 3) & _1BIT;
        int reserved1     = (descriptor[0] >> 1) & _1BIT;
        int dictionary    = (descriptor[0] >> 0) & _1BIT;

        int reserved2     = (descriptor[1] >> 7) & _1BIT;
        int blockSizeId   = (descriptor[1] >> 4) & _3BITS;
        int reserved3     = (descriptor[1] >> 0) & _4BITS;
        int checkBits     = (descriptor[2] >> 0) & _8BITS;
        int checkBits_xxh32;

        blockIndependenceFlag=(descriptor[0] >> 5) & _1BIT;
        blockChecksumFlag = (descriptor[0] >> 4) & _1BIT;
        streamChecksumFlag= (descriptor[0] >> 2) & _1BIT;

        if (version != 1)       EXM_THROW(62, "Wrong version number");
        if (streamSize == 1)    EXM_THROW(64, "Does not support stream size");
        if (reserved1 != 0)     EXM_THROW(65, "Wrong value for reserved bits");
        if (dictionary == 1)    EXM_THROW(66, "Does not support dictionary");
        if (reserved2 != 0)     EXM_THROW(67, "Wrong value for reserved bits");
        if (blockSizeId < 4)    EXM_THROW(68, "Unsupported block size");
        if (reserved3 != 0)     EXM_THROW(67, "Wrong value for reserved bits");
        maxBlockSize = LZ4S_GetBlockSize_FromBlockId(blockSizeId);
        // Checkbits verification
        descriptor[1] &= 0xF0;
        checkBits_xxh32 = XXH32(descriptor, 2, LZ4S_CHECKSUM_SEED);
        checkBits_xxh32 = LZ4S_GetCheckBits_FromXXH(checkBits_xxh32);
        if (checkBits != checkBits_xxh32) EXM_THROW(69, "Stream descriptor error detected");
    }

    // Allocate Memory
    {
        size_t outBuffSize = maxBlockSize + 64 KB;
        if (outBuffSize < MIN_STREAM_BUFSIZE) outBuffSize = MIN_STREAM_BUFSIZE;
        in_buff  = (char*)malloc(maxBlockSize);
        out_buff = (char*)malloc(outBuffSize);
        out_start = out_buff;
        out_end = out_start + outBuffSize;
        if (!in_buff || !out_buff) EXM_THROW(70, "Allocation error : not enough memory");
        if (streamChecksumFlag) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);
    }

    // Main Loop
    while (1)
    {
        unsigned int blockSize, uncompressedFlag;

        // Block Size
        nbReadBytes = fread(&blockSize, 1, 4, finput);
        if( nbReadBytes != 4 ) EXM_THROW(71, "Read error : cannot read next block size");
        if (blockSize == LZ4S_EOS) break;          // End of Stream Mark : stream is completed
        blockSize = LITTLE_ENDIAN_32(blockSize);   // Convert to little endian
        uncompressedFlag = blockSize >> 31;
        blockSize &= 0x7FFFFFFF;
        if (blockSize > maxBlockSize) EXM_THROW(72, "Error : invalid block size");

        // Read Block
        nbReadBytes = fread(in_buff, 1, blockSize, finput);
        if( nbReadBytes != blockSize ) EXM_THROW(73, "Read error : cannot read data block" );

        // Check Block
        if (blockChecksumFlag)
        {
            unsigned int checksum = XXH32(in_buff, blockSize, LZ4S_CHECKSUM_SEED);
            unsigned int readChecksum;
            sizeCheck = fread(&readChecksum, 1, 4, finput);
            if( sizeCheck != 4 ) EXM_THROW(74, "Read error : cannot read next block size");
            readChecksum = LITTLE_ENDIAN_32(readChecksum);   // Convert to little endian
            if (checksum != readChecksum) EXM_THROW(75, "Error : invalid block checksum detected");
        }

        if (uncompressedFlag)
        {
            // Write uncompressed Block
            sizeCheck = fwrite(in_buff, 1, blockSize, foutput);
            if (sizeCheck != (size_t)blockSize) EXM_THROW(76, "Write error : cannot write data block");
            filesize += blockSize;
            if (streamChecksumFlag) XXH32_update(streamChecksumState, in_buff, blockSize);
            if (!blockIndependenceFlag)
            {
                // handle dictionary for streaming
                memcpy(in_buff + blockSize - 64 KB, out_buff, 64 KB);
                LZ4_setDictDecode(&ctx, out_buff, 64 KB);
                out_start = out_buff + 64 KB;
            }
        }
        else
        {
            // Decode Block
            if (out_start + maxBlockSize > out_end) out_start = out_buff;
            decodedBytes = decompressionFunction(&ctx, in_buff, out_start, blockSize, maxBlockSize);
            if (decodedBytes < 0) EXM_THROW(77, "Decoding Failed ! Corrupted input detected !");
            filesize += decodedBytes;
            if (streamChecksumFlag) XXH32_update(streamChecksumState, out_start, decodedBytes);

            // Write Block
            sizeCheck = fwrite(out_start, 1, decodedBytes, foutput);
            if (sizeCheck != (size_t)decodedBytes) EXM_THROW(78, "Write error : cannot write decoded block\n");
            out_start += decodedBytes;
        }

    }

    // Stream Checksum
    if (streamChecksumFlag)
    {
        unsigned int checksum = XXH32_digest(streamChecksumState);
        unsigned int readChecksum;
        sizeCheck = fread(&readChecksum, 1, 4, finput);
        if (sizeCheck != 4) EXM_THROW(74, "Read error : cannot read stream checksum");
        readChecksum = LITTLE_ENDIAN_32(readChecksum);   // Convert to little endian
        if (checksum != readChecksum) EXM_THROW(79, "Error : invalid stream checksum detected");
    }

    // Free
    free(in_buff);
    free(out_buff);

    return filesize;
}


static unsigned long long selectDecoder( FILE* finput,  FILE* foutput)
{
    unsigned int magicNumber, size;
    int errorNb;
    size_t nbReadBytes;

    // Check Archive Header
    nbReadBytes = fread(&magicNumber, 1, MAGICNUMBER_SIZE, finput);
    if (nbReadBytes==0) return 0;                  // EOF
    if (nbReadBytes != MAGICNUMBER_SIZE) EXM_THROW(41, "Unrecognized header : Magic Number unreadable");
    magicNumber = LITTLE_ENDIAN_32(magicNumber);   // Convert to Little Endian format
    if (LZ4S_isSkippableMagicNumber(magicNumber)) magicNumber = LZ4S_SKIPPABLE0;  // fold skippable magic numbers

    switch(magicNumber)
    {
    case LZ4S_MAGICNUMBER:
        return DEFAULT_DECOMPRESSOR(finput, foutput);
    case LEGACY_MAGICNUMBER:
        DISPLAYLEVEL(4, "Detected : Legacy format \n");
        return decodeLegacyStream(finput, foutput);
    case LZ4S_SKIPPABLE0:
        DISPLAYLEVEL(4, "Skipping detected skippable area \n");
        nbReadBytes = fread(&size, 1, 4, finput);
        if (nbReadBytes != 4) EXM_THROW(42, "Stream error : skippable size unreadable");
        size = LITTLE_ENDIAN_32(size);     // Convert to Little Endian format
        errorNb = fseek(finput, size, SEEK_CUR);
        if (errorNb != 0) EXM_THROW(43, "Stream error : cannot skip skippable area");
        return selectDecoder(finput, foutput);
    EXTENDED_FORMAT;
    default:
        if (ftell(finput) == MAGICNUMBER_SIZE) EXM_THROW(44,"Unrecognized header : file cannot be decoded");   // Wrong magic number at the beginning of 1st stream
        DISPLAYLEVEL(2, "Stream followed by unrecognized data\n");
        return 0;
    }
}


int LZ4IO_decompressFilename(char* input_filename, char* output_filename)
{
    unsigned long long filesize = 0, decodedSize=0;
    FILE* finput;
    FILE* foutput;
    clock_t start, end;


    // Init
    start = clock();
    get_fileHandle(input_filename, output_filename, &finput, &foutput);

    // Loop over multiple streams
    do
    {
        decodedSize = selectDecoder(finput, foutput);
        filesize += decodedSize;
    } while (decodedSize);

    // Final Status
    end = clock();
    DISPLAYLEVEL(2, "\r%79s\r", "");
    DISPLAYLEVEL(2, "Successfully decoded %llu bytes \n", filesize);
    {
        double seconds = (double)(end - start)/CLOCKS_PER_SEC;
        DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024);
    }

    // Close
    fclose(finput);
    fclose(foutput);

    // Error status = OK
    return 0;
}