Code/net/minecraft/nbt/NbtIo.java

package net.minecraft.nbt;

import com.google.common.annotations.VisibleForTesting;
import java.io.BufferedOutputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UTFDataFormatException;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.annotation.Nullable;
import net.minecraft.CrashReport;
import net.minecraft.CrashReportCategory;
import net.minecraft.Util;
import net.minecraft.util.DelegateDataOutput;
import net.minecraft.util.FastBufferedInputStream;

public class NbtIo {
    private static final OpenOption[] SYNC_OUTPUT_OPTIONS = new OpenOption[]{
        StandardOpenOption.SYNC, StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING
    };

    public static CompoundTag readCompressed(Path p_310303_, NbtAccounter p_311830_) throws IOException {
        CompoundTag compoundtag;
        try (
            InputStream inputstream = Files.newInputStream(p_310303_);
            InputStream inputstream1 = new FastBufferedInputStream(inputstream);
        ) {
            compoundtag = readCompressed(inputstream1, p_311830_);
        }

        return compoundtag;
    }

    private static DataInputStream createDecompressorStream(InputStream p_202494_) throws IOException {
        return new DataInputStream(new FastBufferedInputStream(new GZIPInputStream(p_202494_)));
    }

    private static DataOutputStream createCompressorStream(OutputStream p_310411_) throws IOException {
        return new DataOutputStream(new BufferedOutputStream(new GZIPOutputStream(p_310411_)));
    }

    public static CompoundTag readCompressed(InputStream p_313037_, NbtAccounter p_312435_) throws IOException {
        CompoundTag compoundtag;
        try (DataInputStream datainputstream = createDecompressorStream(p_313037_)) {
            compoundtag = read(datainputstream, p_312435_);
        }

        return compoundtag;
    }

    public static void parseCompressed(Path p_310443_, StreamTagVisitor p_202489_, NbtAccounter p_301727_) throws IOException {
        try (
            InputStream inputstream = Files.newInputStream(p_310443_);
            InputStream inputstream1 = new FastBufferedInputStream(inputstream);
        ) {
            parseCompressed(inputstream1, p_202489_, p_301727_);
        }
    }

    public static void parseCompressed(InputStream p_202491_, StreamTagVisitor p_202492_, NbtAccounter p_301762_) throws IOException {
        try (DataInputStream datainputstream = createDecompressorStream(p_202491_)) {
            parse(datainputstream, p_202492_, p_301762_);
        }
    }

    public static void writeCompressed(CompoundTag p_128945_, Path p_310344_) throws IOException {
        try (
            OutputStream outputstream = Files.newOutputStream(p_310344_, SYNC_OUTPUT_OPTIONS);
            OutputStream outputstream1 = new BufferedOutputStream(outputstream);
        ) {
            writeCompressed(p_128945_, outputstream1);
        }
    }

    public static void writeCompressed(CompoundTag p_128948_, OutputStream p_128949_) throws IOException {
        try (DataOutputStream dataoutputstream = createCompressorStream(p_128949_)) {
            write(p_128948_, dataoutputstream);
        }
    }

    public static void write(CompoundTag p_128956_, Path p_311890_) throws IOException {
        try (
            OutputStream outputstream = Files.newOutputStream(p_311890_, SYNC_OUTPUT_OPTIONS);
            OutputStream outputstream1 = new BufferedOutputStream(outputstream);
            DataOutputStream dataoutputstream = new DataOutputStream(outputstream1);
        ) {
            write(p_128956_, dataoutputstream);
        }
    }

    @Nullable
    public static CompoundTag read(Path p_310670_) throws IOException {
        if (!Files.exists(p_310670_)) {
            return null;
        } else {
            CompoundTag compoundtag;
            try (
                InputStream inputstream = Files.newInputStream(p_310670_);
                DataInputStream datainputstream = new DataInputStream(inputstream);
            ) {
                compoundtag = read(datainputstream, NbtAccounter.unlimitedHeap());
            }

            return compoundtag;
        }
    }

    public static CompoundTag read(DataInput p_128929_) throws IOException {
        return read(p_128929_, NbtAccounter.unlimitedHeap());
    }

    public static CompoundTag read(DataInput p_128935_, NbtAccounter p_128936_) throws IOException {
        Tag tag = readUnnamedTag(p_128935_, p_128936_);
        if (tag instanceof CompoundTag) {
            return (CompoundTag)tag;
        } else {
            throw new IOException("Root tag must be a named compound tag");
        }
    }

    public static void write(CompoundTag p_128942_, DataOutput p_128943_) throws IOException {
        writeUnnamedTagWithFallback(p_128942_, p_128943_);
    }

    public static void parse(DataInput p_197510_, StreamTagVisitor p_197511_, NbtAccounter p_301755_) throws IOException {
        TagType<?> tagtype = TagTypes.getType(p_197510_.readByte());
        if (tagtype == EndTag.TYPE) {
            if (p_197511_.visitRootEntry(EndTag.TYPE) == StreamTagVisitor.ValueResult.CONTINUE) {
                p_197511_.visitEnd();
            }
        } else {
            switch (p_197511_.visitRootEntry(tagtype)) {
                case HALT:
                default:
                    break;
                case BREAK:
                    StringTag.skipString(p_197510_);
                    tagtype.skip(p_197510_, p_301755_);
                    break;
                case CONTINUE:
                    StringTag.skipString(p_197510_);
                    tagtype.parse(p_197510_, p_197511_, p_301755_);
            }
        }
    }

    public static Tag readAnyTag(DataInput p_301023_, NbtAccounter p_299704_) throws IOException {
        byte b0 = p_301023_.readByte();
        return (Tag)(b0 == 0 ? EndTag.INSTANCE : readTagSafe(p_301023_, p_299704_, b0));
    }

    public static void writeAnyTag(Tag p_300328_, DataOutput p_297970_) throws IOException {
        p_297970_.writeByte(p_300328_.getId());
        if (p_300328_.getId() != 0) {
            p_300328_.write(p_297970_);
        }
    }

    public static void writeUnnamedTag(Tag p_128951_, DataOutput p_128952_) throws IOException {
        p_128952_.writeByte(p_128951_.getId());
        if (p_128951_.getId() != 0) {
            p_128952_.writeUTF("");
            p_128951_.write(p_128952_);
        }
    }

    public static void writeUnnamedTagWithFallback(Tag p_310490_, DataOutput p_311501_) throws IOException {
        writeUnnamedTag(p_310490_, new NbtIo.StringFallbackDataOutput(p_311501_));
    }

    @VisibleForTesting
    public static Tag readUnnamedTag(DataInput p_128931_, NbtAccounter p_128933_) throws IOException {
        byte b0 = p_128931_.readByte();
        if (b0 == 0) {
            return EndTag.INSTANCE;
        } else {
            StringTag.skipString(p_128931_);
            return readTagSafe(p_128931_, p_128933_, b0);
        }
    }

    private static Tag readTagSafe(DataInput p_299672_, NbtAccounter p_299171_, byte p_300451_) {
        try {
            return TagTypes.getType(p_300451_).load(p_299672_, p_299171_);
        } catch (IOException ioexception) {
            CrashReport crashreport = CrashReport.forThrowable(ioexception, "Loading NBT data");
            CrashReportCategory crashreportcategory = crashreport.addCategory("NBT Tag");
            crashreportcategory.setDetail("Tag type", p_300451_);
            throw new ReportedNbtException(crashreport);
        }
    }

    public static class StringFallbackDataOutput extends DelegateDataOutput {
        public StringFallbackDataOutput(DataOutput p_311190_) {
            super(p_311190_);
        }

        @Override
        public void writeUTF(String p_311566_) throws IOException {
            try {
                super.writeUTF(p_311566_);
            } catch (UTFDataFormatException utfdataformatexception) {
                Util.logAndPauseIfInIde("Failed to write NBT String", utfdataformatexception);
                super.writeUTF("");
            }
        }
    }
}