Dotnetzip OverflowException

Question

我正在使用C#进行开发，并使用Dotnetzip的源代码将应用程序放入一个文件中。

但是在运行时，我得到了一个异常：

System.OverflowException: Arithmetic operation resulted in an overflow.
   at Ionic.Crc.CRC32..ctor(Int32 polynomial, Boolean reverseBits) in DotNetZip\CRC32.cs:line 452
   at Ionic.Crc.CRC32..ctor(Boolean reverseBits) in DotNetZip\CRC32.cs:line 418
   at Ionic.Crc.CRC32..ctor() in DotNetZip\CRC32.cs:line 398
   at Ionic.Crc.CrcCalculatorStream..ctor(Boolean leaveOpen, Int64 length, Stream stream, CRC32 crc32) in DotNetZip\CRC32.cs:line 622
   at Ionic.Crc.CrcCalculatorStream..ctor(Stream stream) in DotNetZip\CRC32.cs:line 519
   at Ionic.Zip.ZipEntry.ExtractOne(Stream output) in DotNetZip\ZipEntry.Extract.cs:line 1043
   at Ionic.Zip.ZipEntry.InternalExtract(String baseDir, Stream outstream, String password) in DotNetZip\ZipEntry.Extract.cs:line 870
   at Ionic.Zip.ZipEntry.Extract(String baseDirectory, ExtractExistingFileAction extractExistingFile) in DotNetZip\ZipEntry.Extract.cs:line 240
   at ItxInstaller.Package.GetData(String instFilePath) in Package.cs:line 32
   at ItxInstaller.Install..ctor() in Install.cs:line 26
   at ItxInstaller.Program.Main(String[] args) in Program.cs:line 54

Install.cs如下所示：

public Install()
{
    // The InitializeComponent() call is required for Windows Forms designer support.
    this.InitializeComponent();
    Package pack = Package.GetData(Program.args[1]);
    this.Title.Text = pack.AppName;
    this.PathBox.Text = pack.GeneratePath();
}

Package.cs包含GetData()：

class Package
    {
        public string AppName;
        public string ExePath;

        private string FilePath;

        public Package(string filePath)
        {
            this.ValueInit(filePath);
            this.FilePath = filePath;
        }

        public static Package GetData(string instFilePath)
        {
            using (ZipFile Package = ZipFile.Read(instFilePath))
            {
                Package["app.itx"].Extract(Path.GetTempPath(), ExtractExistingFileAction.OverwriteSilently);
            }

            return new Package(Path.Combine(Path.GetTempPath(), "app.itx"));
        }
}

如何解决这个异常？

Answer 1

当使用"-checked+“作为参数时，我可以用Mono重现这个问题，即启用算术检查。省略此参数将导致可执行文件正常工作。

在Visual Studio中也有它的项目设置。

我已经将相关代码提取到此工作程序中，以便您可以自己测试它：

using System;

namespace Test {
    public class Program {
    public static void Main(string[] args) {
            CRC32 test = new CRC32();
            Console.Out.WriteLine(test.dwPolynomial);
        }
    }

    public class CRC32 {
        public UInt32 dwPolynomial;

        public CRC32() : this(false) {
        }

        public CRC32(bool reverseBits) :
            this(unchecked((int)0xEDB88320), reverseBits) {
        }

        public CRC32(int polynomial, bool reverseBits) {
            this.dwPolynomial = (uint) polynomial; // this is line 452
        }
    }
}

使用dcms test.cs && mono test.exe运行得很好。

使用dcms -checked+ test.cs && mono test.exe会导致

Unhandled Exception: System.OverflowException: Number overflow.
    at Test.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.OverflowException: Number overflow.
    at Test.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0

更新：如果你不能或者不想禁用算术检查，那么你可以修改LIK452的源代码

this.dwPolynomial = unchecked((uint) polynomial);

这将关闭表达式的算术检查。