/// <summary>
/// Adapted from https://github.com/google/brotli/blob/master/c/enc/encode.c (EncodeData).
/// </summary>
public (MetaBlock MetaBlock, BrotliEncodeInfo Next) Encode(BrotliEncodeInfo info)
{
var builder = info.NewBuilder();
do
{
position = lastProcessedPos;
// TODO extend last command somehow???
int chunkLength = Math.Min(input.Length - position - lastInsertLen, InputBlockSize(lgBlock));
if (chunkLength == 0)
{
break;
}
hasher.StitchToPreviousBlock(chunkLength, position);
lastProcessedPos = position + chunkLength;
CreateBackwardReferences(builder, chunkLength);
}while(lastProcessedPos + lastInsertLen < input.Length && ShouldContinueThisBlock(builder));
if (lastInsertLen > 0)
{
builder.AddInsert(Literal.FromBytes(info.Bytes.Slice(builder.OutputSize, lastInsertLen)));
lastInsertLen = 0;
}
return(builder.Build(info));
}
public (MetaBlock, BrotliEncodeInfo) Encode(BrotliEncodeInfo info)
{
var bytes = CollectionHelper.SliceAtMost(info.Bytes, DataLength.MaxUncompressedBytes);
var mb = new MetaBlock.Uncompressed(bytes);
return(mb, info.WithOutputtedMetaBock(mb));
}
public (MetaBlock, BrotliEncodeInfo) Encode(BrotliEncodeInfo info)
{
var bytes = CollectionHelper.SliceAtMost(info.Bytes, DataLength.MaxUncompressedBytes).ToArray();
return(info.NewBuilder()
.AddInsert(Literal.FromBytes(bytes))
.Build(info));
}
public MetaBlock?NextMetaBlock()
{
if (encodeInfo.IsFinished)
{
return(null);
}
var(metaBlock, newEncodeInfo) = encoder.Encode(encodeInfo);
encodeInfo = newEncodeInfo;
return(metaBlock);
}
public (MetaBlock, BrotliEncodeInfo) Encode(BrotliEncodeInfo info)
{
(literalTree, literalRatio) = Huffman.EstimateLiteralRatio(new ArraySegment <byte>(input, ip, blockSize));
var builder = info.NewBuilder();
var nextStep = NextStep.EmitCommands;
while (true)
{
switch (nextStep)
{
case NextStep.EmitCommands:
nextStep = EmitCommands();
break;
case NextStep.EmitCommandsNextHash:
nextStep = EmitCommandsNextHash();
break;
case NextStep.Trawl:
nextStep = Trawl(builder);
break;
case NextStep.EmitRemainder:
nextStep = EmitRemainder(builder);
break;
case NextStep.OutputCompressed:
OnNextBlock();
return(builder.Build(info, new BrotliCompressionParameters.Builder(info.CompressionParameters)
{
GenerateLiteralTree = _ => literalTree
}.Build()));
case NextStep.OutputUncompressed:
var metaBlock = new MetaBlock.Uncompressed(input, metaBlockStart, outputTo - metaBlockStart);
inputSize -= metaBlock.DataLength.UncompressedBytes;
nextIpStart = outputTo;
nextEmit = nextIpStart;
OnNextBlock();
return(metaBlock, info.WithOutputtedMetaBock(metaBlock));
}
}
}
public BrotliFileStreamEncoder(BrotliFileParameters fileParameters, BrotliCompressionParameters compressionParameters, byte[] bytes, IBrotliEncoder encoder)
{
this.encoder = encoder;
this.encodeInfo = new BrotliEncodeInfo(fileParameters, compressionParameters, bytes);
}
