Zip64EndOfCentralDirectoryRecord.cs

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namespace System.IO.Compression;
 
internal struct Zip64EndOfCentralDirectoryRecord
{
    public ulong SizeOfThisRecord;
 
    public ushort VersionMadeBy;
 
    public ushort VersionNeededToExtract;
 
    public uint NumberOfThisDisk;
 
    public uint NumberOfDiskWithStartOfCD;
 
    public ulong NumberOfEntriesOnThisDisk;
 
    public ulong NumberOfEntriesTotal;
 
    public ulong SizeOfCentralDirectory;
 
    public ulong OffsetOfCentralDirectory;
 
    public static bool TryReadBlock(BinaryReader reader, out Zip64EndOfCentralDirectoryRecord zip64EOCDRecord)
    {
        zip64EOCDRecord = default(Zip64EndOfCentralDirectoryRecord);
        if (reader.ReadUInt32() != 101075792)
        {
            return false;
        }
        zip64EOCDRecord.SizeOfThisRecord = reader.ReadUInt64();
        zip64EOCDRecord.VersionMadeBy = reader.ReadUInt16();
        zip64EOCDRecord.VersionNeededToExtract = reader.ReadUInt16();
        zip64EOCDRecord.NumberOfThisDisk = reader.ReadUInt32();
        zip64EOCDRecord.NumberOfDiskWithStartOfCD = reader.ReadUInt32();
        zip64EOCDRecord.NumberOfEntriesOnThisDisk = reader.ReadUInt64();
        zip64EOCDRecord.NumberOfEntriesTotal = reader.ReadUInt64();
        zip64EOCDRecord.SizeOfCentralDirectory = reader.ReadUInt64();
        zip64EOCDRecord.OffsetOfCentralDirectory = reader.ReadUInt64();
        return true;
    }
 
    public static void WriteBlock(Stream stream, long numberOfEntries, long startOfCentralDirectory, long sizeOfCentralDirectory)
    {
        BinaryWriter binaryWriter = new BinaryWriter(stream);
        binaryWriter.Write(101075792u);
        binaryWriter.Write(44uL);
        binaryWriter.Write((ushort)45);
        binaryWriter.Write((ushort)45);
        binaryWriter.Write(0u);
        binaryWriter.Write(0u);
        binaryWriter.Write(numberOfEntries);
        binaryWriter.Write(numberOfEntries);
        binaryWriter.Write(sizeOfCentralDirectory);
        binaryWriter.Write(startOfCentralDirectory);
    }
}