private protected override IHasher CreateHasher(byte[] bytes, BrotliFileParameters fileParameters)
{
return(new HashLongestMatchQuickly.Configure {
BucketBits = 16,
SweepBits = 1
}.Build(bytes));
}
/// <summary>
/// Adapted from https://github.com/google/brotli/blob/master/c/enc/quality.h (MaxMetablockSize, ComputeRbBits).
/// </summary>
private static int MaxMetaBlockSize(BrotliFileParameters fileParameters, int lgBlock)
{
int rb = 1 + Math.Max(fileParameters.WindowSize.Bits, lgBlock);
int bits = Math.Min(rb, WindowSize.MaxBits);
return(1 << bits);
}
private protected override IHasher CreateHasher(byte[] bytes, BrotliFileParameters fileParameters)
{
return(new HashLongestMatchQuickly.Configure {
BucketBits = 16,
// TODO the dictionary lookup is too good and causes a LOT more successful matches than the official compressor
// Dictionary = fileParameters.Dictionary
}.Build(bytes));
}
// Construction
public BrotliGlobalState(BrotliFileParameters parameters, IBrotliOutput outputState)
{
this.Parameters = parameters;
this.outputState = outputState;
this.LiteralBuffer = RingBufferFast <byte> .From(0, 0);
this.DistanceBuffer = RingBufferFast <int> .From(16, 15, 11, 4);
}
public Encoder(byte[] input, IHasher hasher, BrotliFileParameters fileParameters, Features features)
{
this.input = input;
this.hasher = hasher;
this.fileParameters = fileParameters;
this.features = features;
this.lgBlock = ComputeLgBlock(features);
}
public BrotliFileWriter(BrotliFileParameters fileParameters, BrotliSerializationParameters serializationParameters)
{
this.bits = new BitStream();
this.writer = bits.GetWriter();
this.FileParameters = fileParameters;
this.SerializationParameters = serializationParameters;
this.state = new BrotliGlobalState(FileParameters);
WriteHeader();
}
private protected override Copy?FindCopy(BrotliFileParameters parameters, in ArraySegment <byte> bytes, int start, int maxLength)
public BrotliGlobalState(BrotliFileParameters parameters) : this(parameters, new BrotliOutputWindowed(parameters.WindowSize))
{
}
private protected abstract IHasher CreateHasher(byte[] bytes, BrotliFileParameters fileParameters);
protected sealed override IBrotliEncoder CreateEncoder(byte[] bytes, BrotliFileParameters fileParameters)
{
return(new Encoder(bytes, CreateHasher(bytes, fileParameters), fileParameters, SupportedFeatures));
}
protected override IBrotliEncoder CreateEncoder(byte[] bytes, BrotliFileParameters fileParameters)
{
return(new Encoder(bytes));
}
public CompressedMetaBlockBuilder(BrotliFileParameters parameters) : this(new BrotliGlobalState(parameters))
{
}
private void OpenFileWithEncoder(BrotliFileParameters parameters, IBrotliEncoder encoder)
{
OpenFileWith("Open File to Encode", fileName => fileGenerated.EncodeFile(fileName, parameters, encoder));
}
protected abstract IBrotliEncoder CreateEncoder(byte[] bytes, BrotliFileParameters fileParameters);
private BrotliEncodeInfo(BrotliFileParameters fileParameters, BrotliCompressionParameters compressionParameters, BrotliGlobalState state, in ArraySegment <byte> bytes)
public BrotliFileStreamEncoder(BrotliFileParameters fileParameters, BrotliCompressionParameters compressionParameters, byte[] bytes, IBrotliEncoder encoder)
{
this.encoder = encoder;
this.encodeInfo = new BrotliEncodeInfo(fileParameters, compressionParameters, bytes);
}
