Class ZstdCodec

Namespace

CHDSharp.Encoder

Assembly

CHDSharpLib.dll

Zstandard compression at zstd's maximum level, matching MAME's chd_zstd_compressor (ZSTD_maxCLevel()).

public sealed class ZstdCodec : IChdCodec

Inheritance

object

ZstdCodec

Implements

IChdCodec

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

Backed by the managed ZstdSharp.Port 0.7.6 port of libzstd 1.5.5 - the exact version MAME 0.288 ships - keeping the encoder 100% pure C# and cross-platform. Compression is one-shot via ZSTD_compress2, which writes the single-segment frame header with the declared content size; the 1.5.5 encoder emits frames byte-identical to chdman for both raw and CD compound ('cdzs') hunks (verified per-hunk against chdman on the battle-test corpus).

Constructors

ZstdCodec()

Creates the codec.

public ZstdCodec()

Properties

Tag

The four-character codec tag (see CodecTags).

public uint Tag { get; }

Property Value

uint

Methods

Compress(byte[])

Compresses a full hunk. Returns null when the codec does not reduce the size.

public byte[]? Compress(byte[] data)

Parameters

data byte[]

Returns

byte[]