GZipStream exception in Server side when decompressing JSZip compressed file - asp.net

Question

I am working on ASP.net core Web API in server side and Angular 8 on Client side.
I need to compress a list of files and send to server and decompress in server. I use JSZip in client side to compress and my client side code is:
zipAndAddFileToUploader2(file: File): void {
const fileName = file.name
var url = URL.createObjectURL(file)
let self = this;
JSZipUtils.getBinaryContent(url, function (err, data) {
if(err) {
throw err;
}
var zip = new JSZip();
zip.file(fileName, data);
zip.generateAsync({type:'blob', compression: 'DEFLATE', compressionOptions: { level: 9 }})
.then(function(content) {
var file_object = new File([content], fileName, {type: 'application/zip'});
self.uploader.addToQueue([file_object]);
});
});
}
My Server side is as follows:
static byte[] Decompress(byte[] data)
{
byte[] byteArray = null;
using (var compressedStream = new MemoryStream(data))
using (MemoryStream decompressedFileStream = new MemoryStream(data))
{
using (GZipStream decompressionStream = new GZipStream(compressedStream, CompressionMode.Decompress))
{
decompressedFileStream.Position = 0;
decompressionStream.CopyTo(decompressedFileStream);//Exception ****
byteArray = decompressedFileStream.ToArray();
}
}
return byteArray;
}
CopyTo(decompressedFileStream) throws following exception:
Exception : The archive entry was compressed using an unsupported compression method.
Exception details:
at System.IO.Compression.Inflater.Inflate(FlushCode flushCode)
at System.IO.Compression.Inflater.ReadInflateOutput(Byte* bufPtr, Int32 length, FlushCode flushCode, Int32& bytesRead)
at System.IO.Compression.Inflater.ReadOutput(Byte* bufPtr, Int32 length, Int32& bytesRead)
at System.IO.Compression.Inflater.InflateVerified(Byte* bufPtr, Int32 length)
at System.IO.Compression.DeflateStream.CopyToStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.MemoryStream.CopyTo(Stream destination, Int32 bufferSize)
at System.IO.Compression.DeflateStream.CopyToStream.CopyFromSourceToDestination()
at System.IO.Compression.DeflateStream.CopyTo(Stream destination, Int32 bufferSize)
at System.IO.Compression.GZipStream.CopyTo(Stream destination, Int32 bufferSize)
at System.IO.Stream.CopyTo(Stream destination)
at MyApp.MyService.Decompress(Byte[] data) in C:\...\MyService.cs:line 125
at MyApp.MyService.<UpdateMyFile>d__24.MoveNext() in C:\...\MyService.cs:line 137
Any help?

Answer 1

I hope this will be useful to someone.
The problem was in Server side. I changed the code and it is working. Thanks v much all your comments.
static byte[] Decompress(byte[] data)
{
MemoryStream memoryStream = new MemoryStream();
memoryStream.Write(data, 0, data.Length);
ZipArchive archive = new ZipArchive(memoryStream);
ZipArchiveEntry entry = archive.Entries.FirstOrDefault();
if (null == entry)
return null;
var stream1 = entry.Open();
using (var ms = new MemoryStream())
{
stream1.CopyTo(ms);
return ms.ToArray();
}
}