Unzipping files using zipinputstream

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Hi Team,

Below is the code for decompressing the zip folder . I get arithmetic overflow exceptions, Yes I understand that is because byte can handle maximum of 255 byte.

C#

public static void DecompressArchive(StringBuilder newPath, ZipInputStream zipIn)
        {
            ZipEntry entry;
            while ((entry = zipIn.GetNextEntry()) != null)
            {
                if (entry.Name.EndsWith("/"))
                {
                    Directory.CreateDirectory(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
                }
                else
                {
                    FileStream streamWriter = File.Create(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
                    long size = entry.Size;
                    Byte[] data = new Byte[size];
                    while (true)
                    {
                        size = zipIn.Read(data, 0, data.Length);
                        if (size > 0) streamWriter.Write(data, 0, (int)size);
                        else break;
                    }
                    streamWriter.Close();
                }

I understand Byte array cannot take more than 255bytes. How do I handle this situation when my size is >255.

What I have tried:

Tried Converting Byte to int.. However the streamWriter.Write() method takes first parameters of byte of array

Posted 3-Aug-16 19:26pm

ShaHam11

Updated 4-Aug-16 9:09am

v2

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Comments

Mehdi Gholam 4-Aug-16 2:03am

Where is the code from?

ShaHam11 4-Aug-16 2:18am

I got it from google from a blog

Parveen Siwach 4-Aug-16 2:24am

I tried this and is working fine. Can you share the Zip file that you want to unzip?

protected void btnUnzip_Click(object sender, EventArgs e)
{
StringBuilder newPath = new StringBuilder();
newPath.Append(@"D:\Test\");
string zipPathAndFile = @"D:\Data\User_Data.zip";
ZipInputStream zipIn = new ZipInputStream(File.OpenRead(zipPathAndFile));
DecompressArchive(newPath, zipIn);
}

public static void DecompressArchive(StringBuilder newPath, ZipInputStream zipIn)
{
ZipEntry entry;
while ((entry = zipIn.GetNextEntry()) != null)
{
if (entry.Name.EndsWith("/"))
{
Directory.CreateDirectory(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
}
else
{
FileStream streamWriter = File.Create(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
long size = entry.Size;
Byte[] data = new Byte[size];
while (true)
{
size = zipIn.Read(data, 0, data.Length);
if (size > 0) streamWriter.Write(data, 0, (int)size);
else break;
}
streamWriter.Close();
}
}
}

ShaHam11 4-Aug-16 2:34am

it works if the file size is less have zipped folder which is about 800 MB and more

1 solution

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Parveen Siwach · Answer 1 · 2016-08-04T09:09:00

Hi,

Try this code, this will solve your problem. I have tested this to unzip 900MB file.

C#

protected void btnUnzip_Click(object sender, EventArgs e)
        {
            StringBuilder newPath = new StringBuilder();
            newPath.Append(@"D:\Test\");
            string zipPathAndFile = @"F:\EnglishBook.zip";
            ZipInputStream zipIn = new ZipInputStream(File.OpenRead(zipPathAndFile));
            DecompressArchive(newPath, zipIn);
        }

        public static void DecompressArchive(StringBuilder newPath, ZipInputStream zipIn)
        {
            ZipEntry entry;
            while ((entry = zipIn.GetNextEntry()) != null)
            {
                if (entry.Name.EndsWith("/"))
                {
                    Directory.CreateDirectory(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
                }
                else
                {
                    FileStream streamWriter = File.Create(String.Format("{0}{1}", newPath, entry.Name.Replace(@"/", @"\")));
                    //long size = entry.Size;
                    int size = 1024 * 10;
                    Byte[] data = new Byte[size];
                    while (true)
                    {
                        size = zipIn.Read(data, 0, data.Length);
                        if (size > 0)
                        {
                            streamWriter.Write(data, 0, (int)size);
                        }
                        else break;
                    }
                    streamWriter.Close();
                }
            }
        }

Note: Only thing, I have changed is size of chunk.

C#

//long size = entry.Size;
int size = 1024 * 10;

Thanks,