84 lines
2.9 KiB
C#
84 lines
2.9 KiB
C#
using System.Collections.Generic;
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using BrotliCalc.Commands.Base;
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using BrotliCalc.Helpers;
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using BrotliLib.Brotli;
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using BrotliLib.Brotli.Components;
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using BrotliLib.Brotli.Components.Compressed;
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using BrotliLib.Brotli.Components.Data;
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namespace BrotliCalc.Commands{
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class CmdExtractInsertCopyStats : CmdAbstractFileTable.Compressed{
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public override string FullName => "extract-insert-copy-stats";
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public override string ShortName => "eics";
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protected override string WorkDesc => "Extracted insert/copy statistics from";
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protected override string[] Columns { get; } = {
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"File", "Quality", "Meta-Block ID", "Data Length",
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"Insert&Copy Commands", "Literal Bytes",
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"Backward Reference Bytes", "Dictionary Reference Bytes",
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"Backward Reference Count", "Dictionary Reference Count"
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};
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protected override IEnumerable<object[]> GenerateRows(BrotliFileGroup group, BrotliFile.Compressed file){
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var quality = file.Identifier;
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var reader = file.Reader;
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BrotliGlobalState state = reader.State;
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MetaBlock? metaBlock;
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int index = 0;
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while((metaBlock = reader.NextMetaBlock()) != null){
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if (metaBlock is MetaBlock.Compressed c){
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var row = new List<object>{ file.Name, quality, index, metaBlock.DataLength.UncompressedBytes };
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ExtractMetadata(row, c.Data, state);
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yield return row.ToArray();
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}
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++index;
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state = reader.State;
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}
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}
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private static void ExtractMetadata(List<object> row, CompressedData data, BrotliGlobalState state){
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row.Add(data.InsertCopyCommands.Count);
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int literalBytes = 0;
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int backRefBytes = 0;
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int backRefCount = 0;
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int dictRefBytes = 0;
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int dictRefCount = 0;
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foreach(var command in data.InsertCopyCommands){
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var literals = command.Literals;
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var copyLength = command.CopyLength;
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var copyDistance = command.CopyDistance;
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state.OutputLiterals(literals);
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literalBytes += literals.Count;
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if (copyDistance == DistanceInfo.EndsAfterLiterals){
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break;
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}
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var copy = state.OutputCopy(copyLength, copyDistance);
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if (copy.IsBackReference){
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backRefBytes += copy.BytesWritten;
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++backRefCount;
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}
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else{
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dictRefBytes += copy.BytesWritten;
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++dictRefCount;
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}
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}
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row.Add(literalBytes);
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row.Add(backRefBytes);
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row.Add(dictRefBytes);
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row.Add(backRefCount);
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row.Add(dictRefCount);
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}
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}
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}
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