HttpPostedFileBase gets content length to 0 when C# iterates the zipfile

HttpPostedFileBase gets content length to 0 when C# iterates the zipfile

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HttpPostedFileBase gets content length to 0 when C# iterates the zipfile
Tag : chash , By : dummyadresse
Date : November 24 2020, 12:01 PM

hop of those help? I solved my problem. I had to do two separate things:
First, I do not do a copy of the array. Instead, for each zip file, I just copy the stream. This made the ContentLength stay at whatever length it was.
private static bool CanUploadBatchOfFiles(HttpPostedFileBase[] files)
    foreach (var file in files)
        if (file.FileName.EndsWith(".zip"))
            // Part one of the solution
            Stream fileCopy = new MemoryStream();

            using (ZipArchive zipFile = new ZipArchive(fileCopy))
                foreach (ZipArchiveEntry entry in zipFile.Entries)
                    // Code left out

            // Part two of the solution
            file.InputStream.Position = 0;

    return true;

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Python zipfile module: difference between zipfile.ZIP_DEFLATED and zipfile.ZIP_STORED

Tag : python , By : ranja
Date : March 29 2020, 07:55 AM
I wish this help you ZIP_DEFLATED correspond to an archive member (a file inside the archive) which is compressed (or deflated). ZIP_STORED correspond to an archive member which is simply stored, without being compressed, quite the same as an archive member inside a tar file.

How to write a correct zipfile checksum value, and make it as part of zipfile content

Tag : java , By : user183825
Date : March 29 2020, 07:55 AM
Hope this helps Since your making your own checksum computation and validation algorithm, I think you can make the following assumption: zip files contain data and metadata. Data is the files the user has selected from his disk. Metadata is the file with the checksum of the data, also available in the zip.
Then the checksum is not computed from the complete zip file, but from the user's data only, then adding it to a zip file does not change the checksum.

How to change the content type of httppostedfilebase?

Tag : chash , By : Topher Cyll
Date : March 29 2020, 07:55 AM
this one helps. Found this here how set HttpPostedFileBase ContentType value in runtime
public class MemoryPostedFile : HttpPostedFileBase
    private readonly byte[] fileBytes;

    public MemoryPostedFile(byte[] fileBytes, string fileName = null,string ContentType=null)
        this.fileBytes = fileBytes;
        this.FileName = fileName;
        this.ContentType = ContentType;
        this.InputStream = new MemoryStream(fileBytes);

    public override int ContentLength => fileBytes.Length;

    public override string FileName { get; }

    public override string ContentType { get; }

    public override Stream InputStream { get; }

Heapsort - Why the loop in PercolateDown() iterates (length/2) times?

Tag : cpp , By : kdietz
Date : March 29 2020, 07:55 AM

JAVASCRIPT decode a base64string (which is an encoded zipfile) to a zipfile and get the zipfiles content by name

Tag : javascript , By : afds
Date : March 29 2020, 07:55 AM
it helps some times If anyone is interested in my solution to this problem read my answer right here:
I received the data in a base64-string format, then converted the string to a blob. Then I used the blob-handle to load the zipfile with the JSZip-Library. After that I could just grab the contents of the zipfile. Code is below:
function base64ToBlob(base64) {
    let binaryString =  window.atob(base64);
    let binaryLen = binaryString.length;

    let ab = new ArrayBuffer(binaryLen);
    let ia = new Uint8Array(ab);
    for (let i = 0; i < binaryLen; i++) {
       ia[i] = binaryString.charCodeAt(i);

    let bb = new Blob([ab]);
    bb.lastModifiedDate = new Date();
    bb.name = "archive.zip";
    bb.type = "zip";

    return bb;
            let blob = base64ToBlob(resolved);
            let zip = new JSZip();
            zip.loadAsync(blob).then(function(zip) {
                zip.file("archived.json").async("string").then(function (content) {
                   // content is the file as a string
            }).catch((e) => {

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