Joveler.Compression.ZLib 2.0.0

.NET Standard 2.0
There is a newer version of this package available.
See the version list below for details.
dotnet add package Joveler.Compression.ZLib --version 2.0.0
NuGet\Install-Package Joveler.Compression.ZLib -Version 2.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Joveler.Compression.ZLib" Version="2.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Joveler.Compression.ZLib --version 2.0.0
#r "nuget: Joveler.Compression.ZLib, 2.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Joveler.Compression.ZLib as a Cake Addin
#addin nuget:?package=Joveler.Compression.ZLib&version=2.0.0

// Install Joveler.Compression.ZLib as a Cake Tool
#tool nuget:?package=Joveler.Compression.ZLib&version=2.0.0



Joveler.ZLib requires explicit loading of a zlib library.

You must call ZLibInit.GlobalInit() before using Joveler.ZLib.

Put this snippet in your application's init code:

public static void InitNativeLibrary
    string libPath = null;
    if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        switch (RuntimeInformation.ProcessArchitecture)
            case Architecture.X64:
                libPath = Path.Combine("x64", "zlibwapi.dll");
            case Architecture.X86:
                libPath = Path.Combine("x86", "zlibwapi.dll");
    else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
        switch (RuntimeInformation.ProcessArchitecture)
            case Architecture.X64:
                libPath = Path.Combine("x64", "");

    if (libPath == null)
        throw new PlatformNotSupportedException();


WARNING: Caller process and callee library must have the same architecture!

Embedded binary

Joveler.ZLib comes with sets of static binaries of zlib 1.2.11.
They will be copied into the build directory at build time.

Platform Binary
Windows x86 $(OutDir)\x86\zlibwpi.dll
Windows x64 $(OutDir)\x64\zlibwpi.dll
Linux x64 $(OutDir)\x64\
Known Issue
  • Windows x86 version of embedded zlibwapi.dll was compiled without assembly optimization, due to the bug.

Custom binary

To use custom zlib binary instead, call ZLibInit.GlobalInit() with a path to the custom binary.

  • Joveler.ZLib can only recognize zlibwapi.dll (stdcall) , not zlib1.dll (cdecl).
  • Create an empty file named Joveler.Compression.ZLib.Precompiled.Exclude in project directory to prevent copy of package-embedded binary.


To unload zlib library explicitly, call ZLibInit.GlobalCleanup().



The stream to process a data format conforming RFC 1951.

Its API is similar to System.IO.Compression.DeflateStream.

Ex) Compression
using (FileStream fsOrigin = new FileStream("file_origin.bin", FileMode.Open))
using (FileStream fsComp = new FileStream("test.deflate", FileMode.Create))
using (DeflateStream zs = new DeflateStream(fsComp, ZLibMode.Compress, ZLibCompLevel.Default))

ZLibWrapper.CompressionLevel has more option compared to System.IO.Compression.CompressionLevel:

public enum ZLibCompLevel : int
    Default = -1,
    NoCompression = 0,
    BestSpeed = 1,
    BestCompression = 9,
    Level0 = 0,
    Level1 = 1,
    Level2 = 2,
    Level3 = 3,
    Level4 = 4,
    Level5 = 5,
    Level6 = 6,
    Level7 = 7,
    Level8 = 8,
    Level9 = 9,
Ex) Decompression
using (FileStream fsComp = new FileStream("test.deflate", FileMode.Create))
using (FileStream fsDecomp = new FileStream("file_decomp.bin", FileMode.Open))
using (DeflateStream zs = new DeflateStream(fsComp, ZLibMode.Decompress))


A stream to process a data format conforming RFC 1950.

Same usage with DeflateStream.


A stream to process a data format conforming RFC 1952.

Same usage with DeflateStream.


A helper class for DeflateStream.

Ex) DeflateCompressor.Compress(Stream stream)
using (FileStream fsOrigin = new FileStream("file_origin.bin", FileMode.Open))
using (MemoryStream msComp = DeflateCompressor.Compress(fsOrigin))
    // write msComp to file, or send through network, etc
Ex) DeflateCompressor.Decompress(byte[] buffer)
byte[] input = new byte[] { 0x73, 0x74, 0x72, 0x76, 0x71, 0x75, 0x03, 0x00 };
byte[] decompBytes = DeflateCompressor.Decompress(input);
string decompText = Encoding.UTF8.GetString(decompBytes);
Console.WriteLine(decompText); // "ABCDEF"


A helper class for ZLibStream.

Same usage with DeflateCompressor.


A helper class for GZipStream.

Same usage with DeflateCompressor.


NOTE: To use checksum calculation, you MUST USE zlibwapi.dll.


A class to compute the adler32 checksum.

Use Append() methods to compute checksum.
Use Checksum property to get checksum value.

Ex) Append(Stream stream)
using (FileStream fs = new FileStream("read.txt", FileMode.Open))
    Adler32Checksum adler = new Adler32Checksum();
    Console.WriteLine("0x" + adler.Checksum.ToString("X8"));
Ex) Append(byte[] buffer), Append(byte[] buffer, int offset, int count)
Adler32Checksum adler = new Adler32Checksum();
byte[] bin = Encoding.UTF8.GetBytes("ABCDEF");

Console.WriteLine("0x" + adler.Checksum.ToString("X8")); // 0x057E0196

adler.Append(bin, 2, 3);
Console.WriteLine("0x" + adler.Checksum.ToString("X8")); // 0x0BD60262

Static wrapper methods named Adler32Checksum.Adler32() behave just like zlib's adler32() function.

Example of static wrapper methods:

byte[] bin = Encoding.UTF8.GetBytes("ABCDEF");

// Call Adler32() without checksum to use initial state.
uint checksum = Adler32Checksum.Adler32(bin);
Console.WriteLine("0x" + checksum.ToString("X8")); // 0x057E0196

// Call Adler32() with checksum to set as current state.
checksum = Adler32Checksum.Adler32(checksum, bin, 2, 3);
Console.WriteLine("0x" + checksum.ToString("X8")); // 0x0BD60262

// Stream can be passed to Adler32() as well as byte
using (MemoryStream ms = new MemoryStream(bin))
    checksum = Adler32Checksum.Adler32(ms);
    Console.WriteLine("0x" + checksum.ToString("X8")); // 0x057E0196


Same usage with Adler32Checksum.

To use static wrapper methods, call Crc32Checksum.Crc32() instead of Adler32Checksum.Adler32().


A stream designed to compute adler32 checksum on-the-fly.

Ex) Reading from AdlerStream
using (FileStream fs = new FileStream("read.bin", FileMode.Open))
using (Adler32Stream adler = new Adler32Stream(fs))
    byte[] buffer = new byte[256];
    adler.Read(buffer, 0, 256);
    Console.WriteLine("0x" + adler.Checksum.ToString("X8"));

    adler.Read(buffer, 0, 128);
    Console.WriteLine("0x" + adler.Checksum.ToString("X8"));
Ex) Writing to AdlerStream
using (FileStream fs = new FileStream("write.bin", FileMode.Create))
using (Adler32Stream adler = new Adler32Stream(fs))
    byte[] bin;

    bin = new byte[] { 0x01, 0x02, 0x03 };
    adler.Write(bin, 0, bin.Length);
    Console.WriteLine("0x" + adler.Checksum.ToString("X8")); // 0x000D0007

    bin = new byte[] { 0x04, 0x05, 0x06 };
    adler.Write(bin, 0, bin.Length);
    Console.WriteLine("0x" + adler.Checksum.ToString("X8")); // 0x003E0016


Same usage with Adler32Stream.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

    • No dependencies.

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A C# library for reading and writing World of Warcraft's TACT repositories.

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PEBakery is a script engine that specializes in customizing the Windows Preinstalled Environment (WinPE/WinRE).
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