TryGetZip64BlockFromGenericExtraField()

static bool System.IO.Compression.Zip64ExtraField.TryGetZip64BlockFromGenericExtraField ( ZipGenericExtraField extraField, bool readUncompressedSize, bool readCompressedSize, bool readLocalHeaderOffset, bool readStartDiskNumber, out Zip64ExtraField zip64Block )

inlinestaticprivate

Definition at line 103 of file Zip64ExtraField.cs.

    {
        zip64Block = default(Zip64ExtraField);
        zip64Block._compressedSize = null;
        zip64Block._uncompressedSize = null;
        zip64Block._localHeaderOffset = null;
        zip64Block._startDiskNumber = null;
        if (extraField.Tag != 1)
        {
            return false;
        }
        MemoryStream memoryStream = null;
        try
        {
            memoryStream = new MemoryStream(extraField.Data);
            using BinaryReader binaryReader = new BinaryReader(memoryStream);
            memoryStream = null;
            zip64Block._size = extraField.Size;
            ushort num = 0;
            if (readUncompressedSize)
            {
                num += 8;
            }
            if (readCompressedSize)
            {
                num += 8;
            }
            if (readLocalHeaderOffset)
            {
                num += 8;
            }
            if (readStartDiskNumber)
            {
                num += 4;
            }
            if (num != zip64Block._size)
            {
                return false;
            }
            if (readUncompressedSize)
            {
                zip64Block._uncompressedSize = binaryReader.ReadInt64();
            }
            if (readCompressedSize)
            {
                zip64Block._compressedSize = binaryReader.ReadInt64();
            }
            if (readLocalHeaderOffset)
            {
                zip64Block._localHeaderOffset = binaryReader.ReadInt64();
            }
            if (readStartDiskNumber)
            {
                zip64Block._startDiskNumber = binaryReader.ReadInt32();
            }
            if (zip64Block._uncompressedSize < 0)
            {
                throw new InvalidDataException(System.SR.FieldTooBigUncompressedSize);
            }
            if (zip64Block._compressedSize < 0)
            {
                throw new InvalidDataException(System.SR.FieldTooBigCompressedSize);
            }
            if (zip64Block._localHeaderOffset < 0)
            {
                throw new InvalidDataException(System.SR.FieldTooBigLocalHeaderOffset);
            }
            if (zip64Block._startDiskNumber < 0)
            {
                throw new InvalidDataException(System.SR.FieldTooBigStartDiskNumber);
            }
            return true;
        }
        finally
        {
            memoryStream?.Dispose();
        }
    }

References System.SR.FieldTooBigCompressedSize, System.SR.FieldTooBigLocalHeaderOffset, System.SR.FieldTooBigStartDiskNumber, and System.SR.FieldTooBigUncompressedSize.

Referenced by System.IO.Compression.Zip64ExtraField.GetAndRemoveZip64Block(), and System.IO.Compression.Zip64ExtraField.GetJustZip64Block().