.gitignore

@@ -23,6 +23,7 @@ zstdmt
 # Test artefacts
 tmp*
 dictionary.
+dictionary
 NUL
 
 # Build artefacts

CHANGELOG

+v1.4.4
+perf: Improved decompression speed, by > 10%, by @terrelln
+perf: Better compression speed when re-using a context, by @felixhandte
+perf: Fix compression ratio when compressing large files with small dictionary, by @senhuang42
+perf: zstd reference encoder can generate RLE blocks, by @bimbashrestha
+perf: minor generic speed optimization, by @davidbolvansky
+api: new ability to extract sequences from the parser for analysis, by @bimbashrestha
+api: fixed decoding of magic-less frames, by @terrelln
+api: fixed ZSTD_initCStream_advanced() performance with fast modes, reported by @QrczakMK
+cli: Named pipes support, by @bimbashrestha
+cli: short tar's extension support, by @stokito
+cli: command --output-dir-flat= , generates target files into requested directory, by @senhuang42
+cli: commands --stream-size=# and --size-hint=#, by @nmagerko
+cli: command --exclude-compressed, by @shashank0791
+cli: faster `-t` test mode
+cli: improved some error messages, by @vangyzen
+cli: rare deadlock condition within dictionary builder, by @terrelln
+build: single-file decoder with emscripten compilation script, by @cwoffenden
+build: fixed zlibWrapper compilation on Visual Studio, reported by @bluenlive
+build: fixed deprecation warning for certain gcc version, reported by @jasonma163
+build: fix compilation on old gcc versions, by @cemeyer
+build: improved installation directories for cmake script, by Dmitri Shubin
+pack: modified pkgconfig, for better integration into openwrt, requested by @neheb
+misc: Improved documentation : ZSTD_CLEVEL, DYNAMIC_BMI2, ZSTD_CDict, function deprecation, zstd format
+misc: fixed educational decoder : accept larger literals section, and removed UNALIGNED() macro
+
 v1.4.3
 bug: Fix Dictionary Compression Ratio Regression by @cyan4973 (#1709)
-bug: Fix Buffer Overflow in v0.3 Decompression by @felixhandte (#1722)
+bug: Fix Buffer Overflow in legacy v0.3 decompression by @felixhandte (#1722)
 build: Add support for IAR C/C++ Compiler for Arm by @joseph0918 (#1705)
-misc: Add NULL pointer check in util.c by @leeyoung624 (#1706)
 
 v1.4.2
 bug: Fix bug in zstd-0.5 decoder by @terrelln (#1696)

Makefile

@@ -69,6 +69,7 @@ test: MOREFLAGS += -g -DDEBUGLEVEL=$(DEBUGLEVEL) -Werror
 test:
 	MOREFLAGS="$(MOREFLAGS)" $(MAKE) -j -C $(PRGDIR) allVariants
 	$(MAKE) -C $(TESTDIR) $@
+	ZSTD=../../programs/zstd $(MAKE) -C doc/educational_decoder test
 
 ## shortest: same as `make check`
 .PHONY: shortest
@@ -99,8 +100,8 @@ man:
 contrib: lib
 	$(MAKE) -C contrib/pzstd all
 	$(MAKE) -C contrib/seekable_format/examples all
-	$(MAKE) -C contrib/adaptive-compression all
 	$(MAKE) -C contrib/largeNbDicts all
+	cd contrib/single_file_decoder/ ; ./build_test.sh
 
 .PHONY: cleanTabs
 cleanTabs:
@@ -116,7 +117,6 @@ clean:
 	@$(MAKE) -C contrib/gen_html $@ > $(VOID)
 	@$(MAKE) -C contrib/pzstd $@ > $(VOID)
 	@$(MAKE) -C contrib/seekable_format/examples $@ > $(VOID)
-	@$(MAKE) -C contrib/adaptive-compression $@ > $(VOID)
 	@$(MAKE) -C contrib/largeNbDicts $@ > $(VOID)
 	@$(RM) zstd$(EXT) zstdmt$(EXT) tmp*
 	@$(RM) -r lz4

README.md

@@ -15,6 +15,7 @@ a list of known ports and bindings is provided on [Zstandard homepage](http://ww
 [![Build status][AppveyorDevBadge]][AppveyorLink]
 [![Build status][CircleDevBadge]][CircleLink]
 [![Build status][CirrusDevBadge]][CirrusLink]
+[![Fuzzing Status][OSSFuzzBadge]][OSSFuzzLink]
 
 [travisDevBadge]: https://travis-ci.org/facebook/zstd.svg?branch=dev "Continuous Integration test suite"
 [travisLink]: https://travis-ci.org/facebook/zstd
@@ -24,6 +25,8 @@ a list of known ports and bindings is provided on [Zstandard homepage](http://ww
 [CircleLink]: https://circleci.com/gh/facebook/zstd
 [CirrusDevBadge]: https://api.cirrus-ci.com/github/facebook/zstd.svg?branch=dev
 [CirrusLink]: https://cirrus-ci.com/github/facebook/zstd
+[OSSFuzzBadge]: https://oss-fuzz-build-logs.storage.googleapis.com/badges/zstd.svg
+[OSSFuzzLink]: https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:zstd
 
 ## Benchmarks
 

contrib/VS2005/README.md

-## Project Support Notice
-
-The VS2005 Project directory has been moved to the contrib directory in order to indicate that it will no longer be supported.

contrib/VS2005/fullbench/fullbench.vcproj

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-	RootNamespace="fuzzer"
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-				RelativePath="..\..\..\lib\legacy\zstd_v03.h"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\lib\legacy\zstd_v04.h"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\lib\legacy\zstd_v05.h"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\lib\legacy\zstd_v06.h"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\lib\legacy\zstd_v07.h"
-				>
-			</File>
-		</Filter>
-		<Filter
-			Name="Resource Files"
-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav"
-			UniqueIdentifier="{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}"
-			>
-		</Filter>
-	</Files>
-	<Globals>
-	</Globals>
-</VisualStudioProject>

contrib/adaptive-compression/.gitignore

-# binaries generated
-adapt
-datagen

contrib/adaptive-compression/Makefile

-
-ZSTDDIR = ../../lib
-PRGDIR  = ../../programs
-ZSTDCOMMON_FILES := $(ZSTDDIR)/common/*.c
-ZSTDCOMP_FILES   := $(ZSTDDIR)/compress/*.c
-ZSTDDECOMP_FILES := $(ZSTDDIR)/decompress/*.c
-ZSTD_FILES  := $(ZSTDDECOMP_FILES) $(ZSTDCOMMON_FILES) $(ZSTDCOMP_FILES)
-
-MULTITHREAD_LDFLAGS = -pthread
-DEBUGFLAGS= -g -DZSTD_DEBUG=1
-CPPFLAGS += -I$(ZSTDDIR) -I$(ZSTDDIR)/common -I$(ZSTDDIR)/compress \
-            -I$(ZSTDDIR)/dictBuilder -I$(ZSTDDIR)/deprecated -I$(PRGDIR)
-CFLAGS   ?= -O3
-CFLAGS   += -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow                 \
-            -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
-            -Wstrict-prototypes -Wundef                                     \
-            -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings      \
-            -Wredundant-decls
-CFLAGS   += $(DEBUGFLAGS)
-CFLAGS   += $(MOREFLAGS)
-FLAGS     = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(MULTITHREAD_LDFLAGS)
-
-all: adapt datagen
-
-adapt: $(ZSTD_FILES) $(PRGDIR)/util.c $(PRGDIR)/timefn.c adapt.c
-	$(CC) $(FLAGS) $^ -o $@
-
-adapt-debug: $(ZSTD_FILES) $(PRGDIR)/util.c $(PRGDIR)/timefn.c adapt.c
-	$(CC) $(FLAGS) -DDEBUG_MODE=2 $^ -o adapt
-
-datagen : $(PRGDIR)/datagen.c datagencli.c
-	$(CC)      $(FLAGS) $^ -o $@
-
-test-adapt-correctness: datagen adapt
-	@./test-correctness.sh
-	@echo "test correctness complete"
-
-test-adapt-performance: datagen adapt
-	@./test-performance.sh
-	@echo "test performance complete"
-
-clean:
-	@$(RM) -f adapt datagen
-	@$(RM) -rf *.dSYM
-	@$(RM) -f tmp*
-	@$(RM) -f tests/*.zst
-	@$(RM) -f tests/tmp*
-	@echo "finished cleaning"
-
-#-----------------------------------------------------------------------------
-# make install is validated only for Linux, macOS, BSD, Hurd and Solaris targets
-#-----------------------------------------------------------------------------
-ifneq (,$(filter $(shell uname),Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS))
-
-ifneq (,$(filter $(shell uname),SunOS))
-INSTALL ?= ginstall
-else
-INSTALL ?= install
-endif
-
-PREFIX  ?= /usr/local
-DESTDIR ?=
-BINDIR  ?= $(PREFIX)/bin
-
-INSTALL_PROGRAM ?= $(INSTALL) -m 755
-
-install: adapt
-	@echo Installing binaries
-	@$(INSTALL) -d -m 755 $(DESTDIR)$(BINDIR)/
-	@$(INSTALL_PROGRAM) adapt $(DESTDIR)$(BINDIR)/zstd-adaptive
-	@echo zstd-adaptive installation completed
-
-uninstall:
-	@$(RM) $(DESTDIR)$(BINDIR)/zstd-adaptive
-	@echo zstd-adaptive programs successfully uninstalled
-endif

contrib/adaptive-compression/README.md

-### Summary
-
-`adapt` is a new compression tool targeted at optimizing performance across network connections and pipelines. The tool is aimed at sensing network speeds and adapting compression level based on network or pipe speeds.
-In situations where the compression level does not appropriately match the network/pipe speed, compression may be bottlenecking the entire pipeline or the files may not be compressed as much as they potentially could be, therefore losing efficiency. It also becomes quite impractical to manually measure and set an optimalcompression level (which could potentially change over time). 
-
-### Using `adapt`
-
-In order to build and use the tool, you can simply run `make adapt` in the `adaptive-compression` directory under `contrib`. This will generate an executable available for use. Another possible method of installation is running `make install`, which will create and install the binary as the command `zstd-adaptive`.
-
-Similar to many other compression utilities, `zstd-adaptive` can be invoked by using the following format:
-
-`zstd-adaptive [options] [file(s)]`
-
-Supported options for the above format are described below. 
-
-`zstd-adaptive` also supports reading from `stdin` and writing to `stdout`, which is potentially more useful. By default, if no files are given, `zstd-adaptive` reads from and writes to standard I/O. Therefore, you can simply insert it within a pipeline like so:
-
-`cat FILE | zstd-adaptive | ssh "cat - > tmp.zst"`
-
-If a file is provided, it is also possible to force writing to stdout using the `-c` flag like so:
-
-`zstd-adaptive -c FILE | ssh "cat - > tmp.zst"`
-
-Several options described below can be used to control the behavior of `zstd-adaptive`. More specifically, using the `-l#` and `-u#` flags will will set upper and lower bounds so that the compression level will always be within that range. The `-i#` flag can also be used to change the initial compression level. If an initial compression level is not provided, the initial compression level will be chosen such that it is within the appropriate range (it becomes equal to the lower bound). 
-
-### Options
-`-oFILE` : write output to `FILE`
-
-`-i#`    : provide initial compression level (must within the appropriate bounds)
-
-`-h`     : display help/information
-
-`-f`     : force the compression level to stay constant
-
-`-c`     : force write to `stdout`
-
-`-p`     : hide progress bar
-
-`-q`     : quiet mode -- do not show progress bar or other information
-
-`-l#`    : set a lower bound on the compression level (default is 1)
-
-`-u#`    : set an upper bound on the compression level (default is 22)
-### Benchmarking / Test results
-#### Artificial Tests
-These artificial tests were run by using the `pv` command line utility in order to limit pipe speeds (25 MB/s read and 5 MB/s write limits were chosen to mimic severe throughput constraints). A 40 GB backup file was sent through a pipeline, compressed, and written out to a file. Compression time, size, and ratio were computed. Data for `zstd -15` was excluded from these tests because the test runs quite long.
-
-<table>
-<tr><th> 25 MB/s read limit </th></tr>
-<tr><td>
-
-| Compressor Name | Ratio | Compressed Size | Compression Time |
-|:----------------|------:|----------------:|-----------------:| 
-| zstd -3         | 2.108 |       20.718 GB |      29m 48.530s |
-| zstd-adaptive   | 2.230 |       19.581 GB |      29m 48.798s |
-
-</td><tr>
-</table>
-
-<table>
-<tr><th> 5 MB/s write limit </th></tr>
-<tr><td>
-
-| Compressor Name | Ratio | Compressed Size | Compression Time |
-|:----------------|------:|----------------:|-----------------:| 
-| zstd -3         | 2.108 |       20.718 GB |   1h 10m 43.076s |
-| zstd-adaptive   | 2.249 |       19.412 GB |   1h 06m 15.577s |
-
-</td></tr>
-</table>
-
-The commands used for this test generally followed the form:
-
-`cat FILE | pv -L 25m -q | COMPRESSION | pv -q > tmp.zst # impose 25 MB/s read limit`
-
-`cat FILE | pv -q | COMPRESSION | pv -L 5m -q > tmp.zst  # impose 5 MB/s write limit`
-
-#### SSH Tests
-
-The following tests were performed by piping a relatively large backup file (approximately 80 GB) through compression and over SSH to be stored on a server. The test data includes statistics for time and compressed size  on `zstd` at several compression levels, as well as `zstd-adaptive`. The data highlights the potential advantages that `zstd-adaptive` has over using a low static compression level and the negative imapcts that using an excessively high static compression level can have on
-pipe throughput.
-
-| Compressor Name | Ratio | Compressed Size | Compression Time |
-|:----------------|------:|----------------:|-----------------:|
-| zstd -3         | 2.212 |       32.426 GB |   1h 17m 59.756s |
-| zstd -15        | 2.374 |       30.213 GB |   2h 56m 59.441s |
-| zstd-adaptive   | 2.315 |       30.993 GB |   1h 18m 52.860s |
-
-The commands used for this test generally followed the form: 
-
-`cat FILE | COMPRESSION | ssh dev "cat - > tmp.zst"`

contrib/adaptive-compression/datagencli.c

-/*
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-
-/*-************************************
-*  Dependencies
-**************************************/
-#include "util.h"      /* Compiler options */
-#include <stdio.h>     /* fprintf, stderr */
-#include "datagen.h"   /* RDG_generate */
-
-
-/*-************************************
-*  Constants
-**************************************/
-#define KB *(1 <<10)
-#define MB *(1 <<20)
-#define GB *(1U<<30)
-
-#define SIZE_DEFAULT ((64 KB) + 1)
-#define SEED_DEFAULT 0
-#define COMPRESSIBILITY_DEFAULT 50
-
-
-/*-************************************
-*  Macros
-**************************************/
-#define DISPLAY(...)         fprintf(stderr, __VA_ARGS__)
-#define DISPLAYLEVEL(l, ...) if (displayLevel>=l) { DISPLAY(__VA_ARGS__); }
-static unsigned displayLevel = 2;
-
-
-/*-*******************************************************
-*  Command line
-*********************************************************/
-static int usage(const char* programName)
-{
-    DISPLAY( "Compressible data generator\n");
-    DISPLAY( "Usage :\n");
-    DISPLAY( "      %s [args]\n", programName);
-    DISPLAY( "\n");
-    DISPLAY( "Arguments :\n");
-    DISPLAY( " -g#    : generate # data (default:%i)\n", SIZE_DEFAULT);
-    DISPLAY( " -s#    : Select seed (default:%i)\n", SEED_DEFAULT);
-    DISPLAY( " -P#    : Select compressibility in %% (default:%i%%)\n",
-                        COMPRESSIBILITY_DEFAULT);
-    DISPLAY( " -h     : display help and exit\n");
-    return 0;
-}
-
-
-int main(int argc, const char** argv)
-{
-    unsigned probaU32 = COMPRESSIBILITY_DEFAULT;
-    double litProba = 0.0;
-    U64 size = SIZE_DEFAULT;
-    U32 seed = SEED_DEFAULT;
-    const char* const programName = argv[0];
-
-    int argNb;
-    for(argNb=1; argNb<argc; argNb++) {
-        const char* argument = argv[argNb];
-
-        if(!argument) continue;   /* Protection if argument empty */
-
-        /* Handle commands. Aggregated commands are allowed */
-        if (*argument=='-') {
-            argument++;
-            while (*argument!=0) {
-                switch(*argument)
-                {
-                case 'h':
-                    return usage(programName);
-                case 'g':
-                    argument++;
-                    size=0;
-                    while ((*argument>='0') && (*argument<='9'))
-                        size *= 10, size += *argument++ - '0';
-                    if (*argument=='K') { size <<= 10; argument++; }
-                    if (*argument=='M') { size <<= 20; argument++; }
-                    if (*argument=='G') { size <<= 30; argument++; }
-                    if (*argument=='B') { argument++; }
-                    break;
-                case 's':
-                    argument++;
-                    seed=0;
-                    while ((*argument>='0') && (*argument<='9'))
-                        seed *= 10, seed += *argument++ - '0';
-                    break;
-                case 'P':
-                    argument++;
-                    probaU32 = 0;
-                    while ((*argument>='0') && (*argument<='9'))
-                        probaU32 *= 10, probaU32 += *argument++ - '0';
-                    if (probaU32>100) probaU32 = 100;
-                    break;
-                case 'L':   /* hidden argument : Literal distribution probability */
-                    argument++;
-                    litProba=0.;
-                    while ((*argument>='0') && (*argument<='9'))
-                        litProba *= 10, litProba += *argument++ - '0';
-                    if (litProba>100.) litProba=100.;
-                    litProba /= 100.;
-                    break;
-                case 'v':
-                    displayLevel = 4;
-                    argument++;
-                    break;
-                default:
-                    return usage(programName);
-                }
-    }   }   }   /* for(argNb=1; argNb<argc; argNb++) */
-
-    DISPLAYLEVEL(4, "Compressible data Generator \n");
-    if (probaU32!=COMPRESSIBILITY_DEFAULT)
-        DISPLAYLEVEL(3, "Compressibility : %i%%\n", probaU32);
-    DISPLAYLEVEL(3, "Seed = %u \n", (unsigned)seed);
-
-    RDG_genStdout(size, (double)probaU32/100, litProba, seed);
-    DISPLAYLEVEL(1, "\n");
-
-    return 0;
-}

contrib/adaptive-compression/test-correctness.sh

-echo "correctness tests -- general"
-./datagen -s1 -g1GB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s2 -g500MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s3 -g250MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s4 -g125MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s5 -g50MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s6 -g25MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s7 -g10MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s8 -g5MB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s9 -g500KB > tmp
-./adapt -otmp.zst tmp
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- streaming"
-./datagen -s10 -g1GB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s11 -g100MB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s12 -g10MB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s13 -g1MB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s14 -g100KB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s15 -g10KB > tmp
-cat tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- read limit"
-./datagen -s16 -g1GB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s17 -g100MB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s18 -g10MB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s19 -g1MB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s20 -g100KB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s21 -g10KB > tmp
-pv -L 50m -q tmp | ./adapt > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- write limit"
-./datagen -s22 -g1GB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s23 -g100MB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s24 -g10MB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s25 -g1MB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s26 -g100KB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s27 -g10KB > tmp
-pv -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- read and write limits"
-./datagen -s28 -g1GB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s29 -g100MB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s30 -g10MB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s31 -g1MB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s32 -g100KB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s33 -g10KB > tmp
-pv -L 50m -q tmp | ./adapt | pv -L 5m -q > tmp.zst
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- forced compression level"
-./datagen -s34 -g1GB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s35 -g100MB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s36 -g10MB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s37 -g1MB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s38 -g100KB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-./datagen -s39 -g10KB > tmp
-./adapt tmp -otmp.zst -i11 -f
-zstd -d tmp.zst -o tmp2
-diff -s -q tmp tmp2
-rm tmp*
-
-echo -e "\ncorrectness tests -- window size test"
-./datagen -s39 -g1GB | pv -L 25m -q | ./adapt -i1 | pv -q > tmp.zst
-zstd -d tmp.zst
-rm tmp*
-
-echo -e "\ncorrectness tests -- testing bounds"
-./datagen -s40 -g1GB | pv -L 25m -q | ./adapt -i1 -u4 | pv -q > tmp.zst
-rm tmp*
-
-./datagen -s41 -g1GB | ./adapt -i14 -l4 > tmp.zst
-rm tmp*
-make clean

contrib/adaptive-compression/test-performance.sh

-echo "testing time -- no limits set"
-./datagen -s1 -g1GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-rm tmp*
-
-./datagen -s2 -g2GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-rm tmp*
-
-./datagen -s3 -g4GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-rm tmp*
-
-echo -e "\ntesting compression ratio -- no limits set"
-./datagen -s4 -g1GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-ls -l tmp1.zst tmp2.zst
-rm tmp*
-
-./datagen -s5 -g2GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-ls -l tmp1.zst tmp2.zst
-rm tmp*
-
-./datagen -s6 -g4GB > tmp
-time ./adapt -otmp1.zst tmp
-time zstd -1 -o tmp2.zst tmp
-ls -l tmp1.zst tmp2.zst
-rm tmp*
-
-echo e "\ntesting performance at various compression levels -- no limits set"
-./datagen -s7 -g1GB > tmp
-echo "adapt"
-time ./adapt -i5 -f tmp -otmp1.zst
-echo "zstdcli"
-time zstd -5 tmp -o tmp2.zst
-ls -l tmp1.zst tmp2.zst
-rm tmp*
-
-./datagen -s8 -g1GB > tmp
-echo "adapt"
-time ./adapt -i10 -f tmp -otmp1.zst
-echo "zstdcli"
-time zstd -10 tmp -o tmp2.zst
-ls -l tmp1.zst tmp2.zst
-rm tmp*
-
-./datagen -s9 -g1GB > tmp
-echo "adapt"
-time ./adapt -i15 -f tmp -otmp1.zst
-echo "zstdcli"
-time zstd -15 tmp -o tmp2.zst
-ls -l tmp1.zst tmp2.zst
-rm tmp*

contrib/linux-kernel/lib/zstd/fse.h

@@ -232,7 +232,7 @@ If there is an error, the function will return an error code, which can be teste
 *******************************************/
 /* FSE buffer bounds */
 #define FSE_NCOUNTBOUND 512
-#define FSE_BLOCKBOUND(size) (size + (size >> 7))
+#define FSE_BLOCKBOUND(size) (size + (size >> 7) + 4 /* constant for initial fse states */ )
 #define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
 
 /* It is possible to statically allocate FSE CTable/DTable as a table of FSE_CTable/FSE_DTable using below macros */

contrib/single_file_decoder/.gitignore

+zstddeclib.c
+

contrib/single_file_decoder/README.md

+# Single File Zstandard Decompression Library
+
+The script `combine.sh` creates an _amalgamated_ source file that can be used with or without `zstd.h`. This isn't a _header-only_ file but it does offer a similar level of simplicity when integrating into a project.
+
+Create `zstddeclib.c` from the Zstd source using:
+```
+cd zstd/contrib/declib
+./combine.sh -r ../../lib -r ../../lib/common -r ../../lib/decompress -o zstddeclib.c zstddeclib-in.c
+```
+Then add the resulting file to your project (see the [example files](examples)).
+
+`create_single_file_decoder.sh` will run the above script, creating file `zstddeclib.c`.
+`build_test.sh` will create the decoder, then compile and test the library.
+
+Why?
+----
+
+Because all it now takes to support decompressing Zstd is the addition of a single file, two if using the header, with no configuration or further build steps. The library is small, adding, for example, 26kB to an Emscripten compiled WebAssembly project. Native implementations add a little more, 40-70kB depending on the compiler and platform.