Crisis.Ionic.Zip.ZipEntry.InternalOpenReader C# (CSharp) Method

        internal Crisis.Ionic.Crc.CrcCalculatorStream InternalOpenReader(string password)
        {
            ValidateCompression();
            ValidateEncryption();
            SetupCryptoForExtract(password);

            // workitem 7958
            if (this._Source != ZipEntrySource.ZipFile)
                throw new BadStateException("You must call ZipFile.Save before calling OpenReader");

            // LeftToRead is a count of bytes remaining to be read (out)
            // from the stream AFTER decompression and decryption.
            // It is the uncompressed size, unless ... there is no compression in which
            // case ...?  :< I'm not sure why it's not always UncompressedSize
            Int64 LeftToRead = (_CompressionMethod_FromZipFile == (short)CompressionMethod.None)
                ? this._CompressedFileDataSize
                : this.UncompressedSize;

            Stream input = this.ArchiveStream;

            this.ArchiveStream.Seek(this.FileDataPosition, SeekOrigin.Begin);
            // workitem 10178
            Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);

            _inputDecryptorStream = GetExtractDecryptor(input);
            Stream input3 = GetExtractDecompressor(_inputDecryptorStream);

            return new Crisis.Ionic.Crc.CrcCalculatorStream(input3, LeftToRead);
        }