-
Notifications
You must be signed in to change notification settings - Fork 55
/
SynLZ.pas
1474 lines (1425 loc) · 42.8 KB
/
SynLZ.pas
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
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/// SynLZ Compression routines
// - licensed under a MPL/GPL/LGPL tri-license; version 1.18
unit SynLZ;
{
This file is part of Synopse SynLZ Compression.
Synopse SynLZ Compression. Copyright (C) 2022 Arnaud Bouchez
Synopse Informatique - https://synopse.info
*** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the License.
The Original Code is Synopse SynLZ Compression.
The Initial Developer of the Original Code is Arnaud Bouchez.
Portions created by the Initial Developer are Copyright (C) 2022
the Initial Developer. All Rights Reserved.
Contributor(s):
Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****
SynLZ Compression / Decompression library
=========================================
* SynLZ is a very FAST lossless data compression library
written in optimized pascal code for FPC and Delphi 3 and up
with a tuned asm version available
* symetrical compression and decompression speed (which is
very rare above all other compression algorithms in the wild)
* good compression rate (usualy better than LZO)
* fastest averrage compression speed (ideal for xml/text communication, e.g.)
SynLZ implements a new LZ compression algorithm with the following features:
* hashing+dictionary compression in one pass, with no huffman table
* optimized 32bits control word, embedded in the data stream
* in-memory compression (the dictionary is the input stream itself)
* compression and decompression have the same speed (both use hashing)
* thread safe and lossless algorithm
* supports overlapping compression and in-place decompression
* code size for compression/decompression functions is smaller than LZO's
Implementation notes:
- this format is NOT stream compatible with any lz* official format
=> meant for proprietary server-side content real-time compression
=> use it internally in your application, not as exchange format
=> consider our SynLizard.pas unit for Lizard (LZ5) compression standard
- very small code size (less than 1KB for both compressor/decompressor)
- the uncompressed data length is stored in the beginning of the stream
and can be retrieved easily for proper out_p memory allocation
- please give correct data to the decompressor (i.e. first CRC in_p data)
=> we recommend crc32c() from SynCommons, or a zip-like container
- a 2nd more tuned algorithm is included, but is somewhat slower in practice
=> use SynLZ[de]compres1*() functions in your applications
- tested and benchmarked with a lot of data types/sizes
=> use the asm code, which is very tuned: SynLZ[de]compress1asm()
- a hashing limitation makes SynLZ sometimes unable to pack continuous
blocks of same byte -> SynLZ is perfect for xml/text (e.g. log files),
but SynZip or SynLizard may be prefered for database files
- if you include it in your application, please give me some credits:
"use SynLZ compression by https://synopse.info"
- use at your own risk!
Benchmark update - introducing LZ4 at http://code.google.com/p/lz4
190 MB file containing pascal sources, on a Core 2 duo PC, using x86 asm:
LZ4 compression = 1.25 sec, comp. size = 71 MB, decompression = 0.44 sec
SynLZ compression = 1.09 sec, comp. size = 63 MB, decompression = 0.51 sec
zip (1) compression = 6.44 sec, comp. size = 52 MB, decompression = 1.49 sec
zip (6) compression = 20.1 sec, comp. size = 42 MB, decompression = 1.35 sec
Note: zip decompression here uses fast asm optimized version of SynZip.pas
Decompression is slower in SynLZ, due to the algorithm used: it does recreate
the hash table even at decompression, while it is not needed by LZ4.
Having the hash table at hand allows more patterns to be available, so
compression ratio is better, at the expand of a slower speed.
Conclusion:
SynLZ compresses better than LZ4, SynLZ is faster to compress than LZ4,
but slower to decompress than LZ4. So SynLZ is still very competitive for
our Client-Server mORMot purpose, since it is a simple pascal unit with
no external .obj/.o/.dll dependency. ;)
Updated benchmarks on a Core i7, with the 2017/08 x86 and x64 optimized asm:
Win32 Processing devpcm.log = 98.7 MB
Snappy compress in 125.07ms, ratio=84%, 789.3 MB/s
Snappy uncompress in 70.35ms, 1.3 GB/s
SynLZ compress in 103.61ms, ratio=93%, 952.8 MB/s
SynLZ uncompress in 68.71ms, 1.4 GB/s
Win64 Processing devpcm.log = 98.7 MB
Snappy compress in 107.13ms, ratio=84%, 921.5 MB/s
Snappy uncompress in 61.06ms, 1.5 GB/s
SynLZ compress in 97.25ms, ratio=93%, 1015.1 MB/s
SynLZ uncompress in 61.27ms, 1.5 GB/s
}
interface
{$I Synopse.inc}
/// get maximum possible (worse) compressed size for out_p
function SynLZcompressdestlen(in_len: integer): integer;
/// get uncompressed size from lz-compressed buffer (to reserve memory, e.g.)
function SynLZdecompressdestlen(in_p: PAnsiChar): integer;
/// 1st compression algorithm uses hashing with a 32bits control word
function SynLZcompress1pas(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
/// 1st compression algorithm uses hashing with a 32bits control word
// - this is the fastest pure pascal implementation
function SynLZdecompress1pas(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
/// 1st compression algorithm uses hashing with a 32bits control word
// - this overload function is slower, but will allow to uncompress only the start
// of the content (e.g. to read some metadata header)
// - it will also check for dst buffer overflow, so will be more secure than
// other functions, which expect the content to be verified (e.g. via CRC)
function SynLZdecompress1partial(src: PAnsiChar; size: integer; dst: PAnsiChar;
maxDst: integer): integer;
{$ifdef CPUINTEL}
/// optimized x86/x64 asm version of the 1st compression algorithm
function SynLZcompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
/// optimized x86/x64 asm version of the 1st compression algorithm
function SynLZdecompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
{$else}
var
/// fast redirection to pure pascal SynLZ compression (using 1st algorithm)
SynLZCompress1: function(
src: PAnsiChar; size: integer; dst: PAnsiChar): integer = SynLZcompress1pas;
/// fast redirection to pure pascal SynLZ decompression (using 1st algorithm)
SynLZDecompress1: function(
src: PAnsiChar; size: integer; dst: PAnsiChar): integer = SynLZDecompress1pas;
{$endif CPUINTEL}
/// 2nd compression algorithm optimizing pattern copy
// - this algorithm is a bit smaller, but slower, so the 1st method is preferred
function SynLZcompress2(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
/// 2nd compression algorithm optimizing pattern copy
// - this algorithm is a bit smaller, but slower, so the 1st method is preferred
function SynLZdecompress2(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
implementation
function SynLZcompressdestlen(in_len: integer): integer;
begin // get maximum possible (worse) compressed size for out_p
result := in_len+in_len shr 3+16;
end;
type // some cross-platform and cross-compiler definitions
{$ifndef FPC}
PtrInt = {$ifdef CPU64}NativeInt{$else}integer{$endif};
PtrUInt = {$ifdef CPU64}NativeUInt{$else}cardinal{$endif};
{$endif}
{$ifdef DELPHI5OROLDER} // Delphi 5 doesn't have those base types defined :(
PByte = ^Byte;
PWord = ^Word;
PInteger = ^integer;
PCardinal = ^Cardinal;
IntegerArray = array[0..$effffff] of integer;
PIntegerArray = ^IntegerArray;
{$endif}
TOffsets = array[0..4095] of PAnsiChar; // 16KB/32KB hashing code
function SynLZdecompressdestlen(in_p: PAnsiChar): integer;
begin // get uncompressed size from lz-compressed buffer (to reserve memory, e.g.)
result := PWord(in_p)^;
if result and $8000<>0 then
result := (result and $7fff) or (integer(PWord(in_p+2)^) shl 15);
end;
{$ifdef CPUINTEL}
// using direct x86 jmp also circumvents Internal Error C11715 for Delphi 5
{$ifdef CPUX86}
function SynLZcompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
{$ifdef FPC} nostackframe; assembler; {$endif}
asm
push ebp
push ebx
push esi
push edi
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -32
mov esi, eax // esi=src
mov edi, ecx // edi=dst
mov [esp+08H], ecx
mov eax, edx
cmp eax, 32768
jl @@0889
or ax, 8000H
mov [edi], eax
mov eax, edx
shr eax, 15
mov [edi+2], eax
add edi, 4
jmp @@0891
@@0890: mov eax, 2
jmp @@0904
@@0889: mov [edi], eax
test eax, eax
jz @@0890
add edi, 2
@@0891: lea eax, [edx+esi]
mov [esp+18H], edi
mov [esp+0CH], eax
sub eax, 11
mov [esp+4], eax
lea ebx, [esp+24H]
xor eax, eax
mov ecx, 1024
@@089I: mov [ebx], eax // faster than FillChar / stosb
mov [ebx+4], eax
mov [ebx+8], eax
mov [ebx+12], eax
add ebx, 16
dec ecx
jnz @@089I
mov [edi], eax
add edi, 4
mov ebx, 1 // ebx=1 shl CWbit
// main loop:
cmp esi, [esp+4]
ja @@0900
@@0892: mov edx, [esi]
mov eax, edx
shr edx, 12
xor edx, eax
and edx, 0FFFH
mov ebp, [esp+edx*4+24H]
mov ecx, [esp+edx*4+4024H]
mov [esp+edx*4+24H], esi
xor ecx, eax
test ecx, 0FFFFFFH
mov [esp+edx*4+4024H], eax
jnz @@0897
mov eax, esi
or ebp, ebp
jz @@0897
sub eax, ebp
mov ecx, [esp+18H]
cmp eax, 2
jle @@0897
lea esi, [esi+2]
or dword ptr[ecx], ebx
mov ecx, [esp+0CH]
add ebp, 2
mov eax, 1
sub ecx, esi
dec ecx
mov [esp], ecx
cmp ecx, 271
jl @@0894
mov dword ptr [esp], 271
jmp @@0894
@@0893: inc eax
@@0894: mov ecx, [ebp+eax]
cmp cl, [esi+eax]
jnz @@0895
cmp eax, [esp]
jge @@0895
inc eax
cmp ch, [esi+eax]
jnz @@0895
shr ecx, 16
cmp eax, [esp]
jge @@0895
inc eax
cmp cl, [esi+eax]
jnz @@0895
cmp eax, [esp]
jge @@0895
inc eax
cmp ch, [esi+eax]
jnz @@0895
cmp eax, [esp]
jl @@0893
@@0895: add esi, eax
shl edx, 4
cmp eax, 15
jg @@0896
or eax, edx
mov word ptr [edi], ax
add edi, 2
jmp @@0898
@@0896: sub eax, 16
mov [edi], dx
mov [edi+2H], al
add edi, 3
jmp @@0898
@@0897: mov al, [esi] // movsb is actually slower!
mov [edi], al
inc esi
inc edi
@@0898: add ebx, ebx
jz @@0899
cmp esi, [esp+4]
jbe @@0892
jmp @@0900
@@0899: mov [esp+18H], edi
mov [edi], ebx
inc ebx
add edi, 4
cmp esi, [esp+4]
jbe @@0892
@@0900: cmp esi, [esp+0CH]
jnc @@0903
@@0901: mov al, [esi]
mov [edi], al
inc esi
inc edi
add ebx, ebx
jz @@0902
cmp esi, [esp+0CH]
jc @@0901
jmp @@0903
@@0902: mov [edi], ebx
inc ebx
add edi, 4
cmp esi, [esp+0CH]
jc @@0901
@@0903: mov eax, edi
sub eax, [esp+08H]
@@0904: add esp, 32804
pop edi
pop esi
pop ebx
pop ebp
{$else CPUX86}
function SynLZcompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
var off: TOffsets;
cache: array[0..4095] of cardinal; // uses 32KB+16KB=48KB on stack
asm // rcx=src, edx=size, r8=dest
{$ifdef win64} // additional registers to preserve
push rdi
push rsi
{$else} // Linux 64-bit ABI
mov r8, rdx
mov rdx, rsi
mov rcx, rdi
{$endif win64}
push rbx
push r12
push r13
push r14
push r15
mov r15, r8 // r8=dest r15=dst_beg
mov rbx, rcx // rbx=src
cmp edx, 32768
jc @03
mov eax, edx
and eax, 7FFFH
or eax, 8000H
mov word ptr [r8], ax
mov eax, edx
shr eax, 15
mov word ptr [r8+2H], ax
add r8, 4
jmp @05
@03: mov word ptr [r8], dx
test edx, edx
jnz @04
mov r15d, 2
jmp @19
nop
@04: add r8, 2
@05: lea r9, [rdx+rbx] // r9=src_end
lea r10, [r9-0BH] // r10=src_endmatch
mov ecx, 1 // ecx=CWBits
mov r11, r8 // r11=CWpoint
mov dword ptr [r8], 0
add r8, 4
pxor xmm0, xmm0
mov eax, 32768-64
@06: movaps dqword ptr [off+rax-48], xmm0 // stack is aligned to 16 bytes
movaps dqword ptr [off+rax-32], xmm0
movaps dqword ptr [off+rax-16], xmm0
movaps dqword ptr [off+rax], xmm0
sub eax, 64
jae @06
cmp rbx, r10
ja @15
@07: mov edx, dword ptr [rbx]
mov rax, rdx
mov r12, rdx
shr rax, 12
xor rax, rdx
and rax, 0FFFH // rax=h
mov r14, qword ptr [off+rax*8] // r14=o
mov edx, dword ptr [cache+rax*4]
mov qword ptr [off+rax*8], rbx
mov dword ptr [cache+rax*4], r12d
xor rdx, r12
test r14, r14
lea rdi, [r9-1]
je @12
and rdx, 0FFFFFFH
jne @12
mov rdx, rbx
sub rdx, r14
cmp rdx, 2
jbe @12
or dword ptr[r11], ecx
add rbx, 2
add r14, 2
mov esi, 1
sub rdi, rbx
cmp rdi, 271
jc @09
mov edi, 271
jmp @09
@08: inc rsi
@09: mov edx, dword ptr [r14+rsi]
cmp dl, byte ptr [rbx+rsi]
jnz @10
cmp rsi, rdi
jge @10
inc rsi
cmp dh, byte ptr [rbx+rsi]
jnz @10
shr edx, 16
cmp rsi, rdi
jge @10
inc rsi
cmp dl, byte ptr [rbx+rsi]
jnz @10
cmp rsi, rdi
jge @10
inc rsi
cmp dh, byte ptr [rbx+rsi]
jnz @10
cmp rsi, rdi
jc @08
@10: add rbx, rsi
shl rax, 4
cmp rsi, 15
ja @11
or rax, rsi
mov word ptr [r8], ax
add r8, 2
jmp @13
@11: sub rsi, 16
mov word ptr [r8], ax
mov byte ptr [r8+2H], sil
add r8, 3
jmp @13
@12: mov al, byte ptr [rbx]
mov byte ptr [r8], al
add rbx, 1
add r8, 1
@13: add ecx, ecx
jnz @14
mov r11, r8
mov [r8], ecx
add r8, 4
add ecx, 1
@14: cmp rbx, r10
jbe @07
@15: cmp rbx, r9
jnc @18
@16: mov al, byte ptr [rbx]
mov byte ptr [r8], al
add rbx, 1
add r8, 1
add ecx, ecx
jnz @17
mov [r8], ecx
add r8, 4
add ecx, 1
@17: cmp rbx, r9
jc @16
@18: sub r8, r15
mov r15, r8
@19: mov rax, r15
pop r15
pop r14
pop r13
pop r12
pop rbx
{$ifdef win64} // additional registers to preserve
pop rsi
pop rdi
{$endif win64}
{$endif CPUX86}
end;
{$endif CPUINTEL}
function SynLZcompress1pas(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
var dst_beg, // initial dst value
src_end, // real last byte available in src
src_endmatch, // last byte to try for hashing
o: PAnsiChar;
CWbit: byte;
CWpoint: PCardinal;
v, h, cached, t, tmax: PtrUInt;
offset: TOffsets;
cache: array[0..4095] of cardinal; // 16KB+16KB=32KB on stack (48KB under Win64)
begin
dst_beg := dst;
// 1. store in_len
if size>=$8000 then begin // size in 32KB..2GB -> stored as integer
PWord(dst)^ := $8000 or (size and $7fff);
PWord(dst+2)^ := size shr 15;
inc(dst,4);
end else begin
PWord(dst)^ := size ; // size<32768 -> stored as word
if size=0 then begin
result := 2;
exit;
end;
inc(dst,2);
end;
// 2. compress
src_end := src+size;
src_endmatch := src_end-(6+5);
CWbit := 0;
CWpoint := pointer(dst);
PCardinal(dst)^ := 0;
inc(dst,sizeof(CWpoint^));
fillchar(offset,sizeof(offset),0); // fast 16KB reset to 0
// 1. main loop to search using hash[]
if src<=src_endmatch then
repeat
v := PCardinal(src)^;
h := ((v shr 12) xor v) and 4095;
o := offset[h];
offset[h] := src;
cached := v xor cache[h]; // o=nil if cache[h] is uninitialized
cache[h] := v;
if (cached and $00ffffff=0) and (o<>nil) and (src-o>2) then begin
CWpoint^ := CWpoint^ or (cardinal(1) shl CWbit);
inc(src,2);
inc(o,2);
t := 1;
tmax := src_end-src-1;
if tmax>=(255+16) then
tmax := (255+16);
while (o[t]=src[t]) and (t<tmax) do
inc(t);
inc(src,t);
h := h shl 4;
// here we have always t>0
if t<=15 then begin // mark 2 to 17 bytes -> size=1..15
PWord(dst)^ := integer(t or h);
inc(dst,2);
end else begin // mark 18 to (255+16) bytes -> size=0, next byte=t
dec(t,16);
PWord(dst)^ := h; // size=0
dst[2] := ansichar(t);
inc(dst,3);
end;
end else begin
dst^ := src^;
inc(src);
inc(dst);
end;
if CWbit<31 then begin
inc(CWbit);
if src<=src_endmatch then continue else break;
end else begin
CWpoint := pointer(dst);
PCardinal(dst)^ := 0;
inc(dst,sizeof(CWpoint^));
CWbit := 0;
if src<=src_endmatch then continue else break;
end;
until false;
// 2. store remaining bytes
if src<src_end then
repeat
dst^ := src^;
inc(src);
inc(dst);
if CWbit<31 then begin
inc(CWbit);
if src<src_end then continue else break;
end else begin
PCardinal(dst)^ := 0;
inc(dst,4);
CWbit := 0;
if src<src_end then continue else break;
end;
until false;
result := dst-dst_beg;
end;
procedure movechars(s,d: PAnsiChar; t: PtrUInt); {$ifdef HASINLINE}inline;{$endif}
// fast code for unaligned and overlapping (see {$define WT}) small blocks
// this code is sometimes used rather than system.move()
var c: AnsiChar; // better code generation on FPC
begin
inc(PtrUInt(s), t);
inc(PtrUInt(d), t);
PtrInt(t) := -PtrInt(t);
repeat
c := s[t];
d[t] := c;
inc(t);
until t=0;
end;
const
bitlut: array[0..15] of integer =
(4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0);
function SynLZdecompress1b(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
// this routine was trying to improve speed, but was slower
var last_hashed: PAnsiChar; // initial src and dst value
src_end: PAnsiChar;
CWbit: integer;
CW, v, t, h: integer;
offset: TOffsets;
label nextCW;
begin
// src_beg := src;
// dst_beg := dst;
src_end := src+size;
// 1. retrieve out_len
result := PWord(src)^;
if result=0 then exit;
inc(src,2);
if result and $8000<>0 then begin
result := (result and $7fff) or (integer(PWord(src)^) shl 15);
inc(src,2);
end;
// 2. decompress
last_hashed := dst-1;
CWbit := 32;
nextCW:
CW := PCardinal(src)^;
inc(src,4);
CWbit := CWbit-32;
if src<src_end then
repeat
if CW and 1=0 then begin
if CWbit<(32-4) then begin
PCardinal(dst)^ := PCardinal(src)^;
v := bitlut[CW and 15];
inc(src,v);
inc(dst,v);
inc(CWbit,v);
CW := CW shr v;
if src>=src_end then break;
while last_hashed<dst-3 do begin
inc(last_hashed);
v := PCardinal(last_hashed)^;
offset[((v shr 12) xor v) and 4095] := last_hashed;
end;
end else begin
dst^ := src^;
inc(src);
inc(dst);
if src>=src_end then break;
if last_hashed<dst-3 then begin
inc(last_hashed);
v := PCardinal(last_hashed)^;
offset[((v shr 12) xor v) and 4095] := last_hashed;
end;
inc(CWbit);
CW := CW shr 1;
if CWbit<32 then
continue else
goto nextCW;
end;
end else begin
h := PWord(src)^;
inc(src,2);
t := (h and 15)+2;
h := h shr 4;
if t=2 then begin
t := ord(src^)+(16+2);
inc(src);
end;
if dst-offset[h]<t then
movechars(offset[h],dst,t) else
move(offset[h]^,dst^,t);
if last_hashed<dst then
repeat
inc(last_hashed);
v := PCardinal(last_hashed)^;
offset[((v shr 12) xor v) and 4095] := last_hashed;
until last_hashed>=dst;
inc(dst,t);
if src>=src_end then break;
last_hashed := dst-1;
inc(CWbit);
CW := CW shr 1;
if CWbit<32 then
continue else
goto nextCW;
end;
until false;
// assert(result=dst-dst_beg);
end;
{$ifdef CPUINTEL}
{$ifdef CPUX86}
// using direct x86 jmp also circumvents Internal Error C11715 for Delphi 5
function SynLZdecompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
{$ifdef FPC} nostackframe; assembler; {$endif}
asm
push ebp
push ebx
push esi
push edi
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -4092
push eax
add esp, -24
mov esi, ecx
mov ebx, eax
add edx, eax
mov [esp+8H], esi
mov [esp+10H], edx
movzx eax, word ptr [ebx]
mov [esp], eax
or eax,eax
je @@0917
add ebx, 2
mov eax, [esp]
test ah, 80H
jz @@0907
and eax, 7FFFH
movzx edx, word ptr [ebx]
shl edx, 15
or eax, edx
mov [esp], eax
add ebx, 2
@@0907: lea ebp, [esi-1]
@@0908: mov ecx, [ebx]
add ebx, 4
mov [esp+14H], ecx
mov edi, 1 // edi=CWbit
cmp ebx, [esp+10H]
jnc @@0917
@@0909: mov ecx, [esp+14H]
@@090A: test ecx, edi
jnz @@0911
mov al, [ebx]
inc ebx
mov [esi], al
inc esi
cmp ebx, [esp+10H]
lea eax, [esi-3]
jnc @@0917
cmp eax, ebp
jbe @@0910
inc ebp
mov eax, [ebp]
mov edx, eax
shr eax, 12
xor eax, edx
and eax, 0FFFH
mov [esp+eax*4+1CH], ebp
@@0910: add edi, edi
jnz @@090A
jmp @@0908
@@0911: movzx edx, word ptr [ebx]
add ebx, 2
mov eax, edx
and edx, 0FH
add edx, 2
shr eax, 4
cmp edx,2
jnz @@0912
movzx edx, byte ptr [ebx]
inc ebx
add edx, 18
@@0912: mov eax, [esp+eax*4+1CH]
mov ecx, esi
mov [esp+18H], edx
sub ecx, eax
cmp ecx, edx
jl @@0913
cmp edx, 32 // inlined optimized move()
ja @large
sub edx, 8
jg @9_32
mov ecx, [eax]
mov eax, [eax+4] // always copy 8 bytes for 0..8
mov [esi], ecx // safe since src_endmatch := src_end-(6+5)
mov [esi+4], eax
jmp @movend
@9_32: fild qword ptr[eax+edx]
fild qword ptr[eax]
cmp edx, 8
jle @16
fild qword ptr[eax+8]
cmp edx, 16
jle @24
fild qword ptr[eax+16]
fistp qword ptr[esi+16]
@24: fistp qword ptr[esi+8]
@16: fistp qword ptr[esi]
fistp qword ptr[esi+edx]
jmp @movend
nop
@large: push esi
fild qword ptr[eax]
lea eax, [eax+edx-8]
lea edx, [esi+edx-8]
fild qword ptr[eax]
push edx
neg edx
and esi, -8
lea edx, [edx+esi+8]
pop esi
@lrgnxt:fild qword ptr[eax+edx]
fistp qword ptr[esi+edx]
add edx, 8
jl @lrgnxt
fistp qword ptr[esi]
pop esi
fistp qword ptr[esi]
@movend:cmp esi, ebp
jbe @@0916
@@0915: inc ebp
mov edx, [ebp]
mov eax, edx
shr edx, 12
xor eax, edx
and eax, 0FFFH
mov [esp+eax*4+1CH], ebp
cmp esi, ebp
ja @@0915
@@0916: add esi, [esp+18H]
cmp ebx, [esp+10H]
jnc @@0917
add edi, edi
lea ebp, [esi-1]
jz @@0908
jmp @@0909
@@0913: push ebx
xor ecx, ecx
@s: dec edx
mov bl, [eax+ecx]
mov [esi+ecx], bl
lea ecx,[ecx+1]
jnz @s
pop ebx
jmp @movend
@@0917: mov eax, [esp]
add esp, 16412
pop edi
pop esi
pop ebx
pop ebp
{$else CPUX86}
function SynLZdecompress1(src: PAnsiChar; size: integer; dst: PAnsiChar): integer;
var off: TOffsets;
asm // rcx=src, edx=size, r8=dest
{$ifdef win64} // additional registers to preserve
push rsi
push rdi
{$else} // Linux 64-bit ABI
mov r8, rdx
mov rdx, rsi
mov rcx, rdi
{$endif win64}
push rbx
push r12
push r13
push r14
push r15
movzx eax, word ptr [rcx] // rcx=src eax=result
lea r9, [rcx+rdx] // r9=src_end
test eax, eax
je @35
add rcx, 2
mov r10d, eax
and r10d, 8000H
jz @21
movzx ebx, word ptr [rcx]
shl ebx, 15
mov r10d, eax
and r10d, 7FFFH
or r10d, ebx
mov eax, r10d
add rcx, 2
@21: lea r10, [r8-1H] // r10=last_hashed r8=dest
@22: mov edi, dword ptr [rcx] // edi=CW
add rcx, 4
mov r13d, 1 // r13d=CWBit
cmp rcx, r9
jnc @35
@23: test r13d, edi
jnz @25
mov bl, byte ptr [rcx]
mov byte ptr [r8], bl
add rcx, 1
lea rbx, [r8-2H]
add r8, 1
cmp rcx, r9
jnc @35
cmp rbx, r10
jbe @24
add r10, 1
mov esi, dword ptr [r10]
mov rbx, rsi
shr esi, 12
xor ebx, esi
and ebx, 0FFFH
mov qword ptr [off+rbx*8], r10
@24: shl r13d, 1
jnz @23
jmp @22
@25: movzx r11, word ptr [rcx] // r11=t
add rcx, 2
mov ebx, r11d // ebx=h
shr ebx, 4
and r11, 0FH
lea r11, [r11+2H]
jnz @26
movzx r11, byte ptr [rcx]
add rcx, 1
lea r11, [r11+12H]
@26: mov r14, qword ptr [off+rbx*8] // r14=o
mov rbx, r8
xor rsi, rsi
sub rbx, r14
mov r12, r11
mov r15, r11
cmp rbx, r11
jc @29
shr r12, 3
jz @30
@27: mov rbx, qword ptr [r14+rsi] // inline move by 8 bytes
mov qword ptr [r8+rsi], rbx
add rsi, 8
dec r12
jnz @27
mov rbx, qword ptr [r14+rsi] // 1..7 remaining bytes
and r15, 7
jz @31
@28: mov byte ptr [r8+rsi], bl
shr rbx, 8
inc rsi
dec r15
jnz @28
jmp @31
@29: mov bl, byte ptr [r14+rsi] // overlaping move
mov byte ptr [r8+rsi], bl
inc rsi
dec r12
jnz @29
cmp rcx, r9
jnz @33
jmp @35
@30: mov rbx, qword ptr [r14]
mov qword ptr [r8], rbx
@31: cmp rcx, r9
jz @35
cmp r10, r8