Issue with stream unzip for large files (more than 3 Gb or so)

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#20562 |

We are using XCeed.Zip 3.5 in backup /restore software, but testing on 5.8 gave same results. Unzipping large files (more than 3 GB) always cause System.OverflowException – “Arithmetic operation resulted in an overflow” (whereas we do not have any problem with smaller files)

Stacktrace:

    at Xceed.Zip.ItemHeader.ReadDescriptorHeader(BinaryReader reader)
   at Xceed.Zip.ReaderWriter.ZipReader.ReadItemDataDescriptorHeader(ReaderWriterItemInfo itemInfo)
   at Xceed.Zip.ReaderWriter.ZipReader.ReadItemData(Byte[] buffer, Int32 offset, Int32 count)
   at Xceed.Zip.ReaderWriter.ZipReader.ReadItemData(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
   at Xceed.Zip.ReaderWriter.ZipReader.ReadItemData(Stream stream, Int32 bufferSize)
   at Xceed.Zip.ReaderWriter.ZipReader.ReadItemData(Stream stream)
   at PlayWithXceed.XceedStream.UnzipFileStream() in c:\Users\Sergius\Documents\Visual Studio 2012\Projects\PlayWithXceed\PlayWithXceed\XceedStream.cs:line 32

 

Test code looks like this:

         public static void UnzipFileStream()
        {
            using (var sourceFileStream = new FileStream(@”d:\Temp\964b844d18b14237a2ba92a04ea93196.zip”, FileMode.Open, FileAccess.Read))
            {
                using (var zipReader = new ZipReader(sourceFileStream))
                {
                    ZipItemLocalHeader header = zipReader.ReadItemLocalHeader();
                    string path = Path.Combine(@”d:\Temp”, header.FileName.Replace(“\\”, “”));

                    if (File.Exists(path))
                    {
                        File.Delete(path);
                    }

                    using (var targetFileStream = new FileStream(path, FileMode.CreateNew, FileAccess.Write, FileShare.None))
                    {
                        zipReader.ReadItemData(targetFileStream);
                        zipReader.ReadEndHeader();                        
                    }
                }
            }
        }

Do you have any idea what’s going wrong?

 Test file available here : https://yadi.sk/d/bJ8WmyChnhHBH

 

Thank you

Sergii

Imported from legacy forums. Posted by Sergii (had 1 views)

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