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Questions tagged [deflatestream]

Microsoft .NET built-in support for standards-compliant Deflate algorithm (compress and decompress).

DeflateStream is a Microsoft .NET Class that provides standards-compliant support for the "DEFLATE" compression algorithm.

78 questions
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zip and unzip string with Deflate

I need to zip and unzip string Here is code: public static byte[] ZipStr(String str) { using (MemoryStream output = new MemoryStream()) using (DeflateStream gzip = new DeflateStream(output, CompressionMode.Compress)) using (StreamWriter…
Mikhail
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GZipStream and DeflateStream produce bigger files

I'm trying to use deflate/gzip streams in C# but it appears that the files after compression are bigger than before. For example, I compress a docx file of 900ko, but it produce a 1.4Mo one ! And it does it for every file I tried. May be I am wrong…
kite
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DeflateStream not decompressing data (the first time)

So here's a strange one. I have this method to take a Base64-encoded deflated string and return the original data: public static string Base64Decompress(string base64data) { byte[] b = Convert.FromBase64String(base64data); using (var orig =…
josh3736
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Can't compress with mono?

I'm trying to compress some data in mono like this: public static string Save(FlightProgram program, bool compressed) { using (MemoryStream ms = new MemoryStream()) { BinaryFormatter f = new BinaryFormatter(); if…
pixartist
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3 answers

Why is my DeflateStream not receiving data correctly over TCP?

I have a TcpClient class on a client and server setup on my local machine. I have been using the Network stream to facilitate communications back and forth between the 2 successfully. Moving forward I am trying to implement compression in the…
Adam Heeg
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6
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5 answers

Read Dynamics NAV Table Metadata with SQL

I would like to be able to read the Dynamics NAV 2013 Table Metadata directly from the SQL Server database without requiring the NAV Development Environment. I can view the binary SQL "image" BLOB columns with a query like the following (filter as…
Mister_Tom
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Raw Stream Has Data, Deflate Returns Zero Bytes

I'm reading data (an adCenter report, as it happens), which is supposed to be zipped. Reading the contents with an ordinary stream, I get a couple thousand bytes of gibberish, so this seems reasonable. So I feed the stream to DeflateStream. First,…
user565869
5
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3 answers

C# Custom Serialization/Deserialization together with DeflateStreams

I'm trying to do custom serialization/deserialization of an object as well as compressing/decompressing the serialized data with DeflateStreams. I originally did this for more complex objects but cut it down to try and figure out the problem,…
hillsprig
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1 answer

Is it possible to use the .NET DeflateStream for pdf creation?

I'm playing around with the ability to create pdf files through C# code. I have been looking at the PDF specifications and have been able to create a working PDF file, done by taking strings of data and encoding them into byte arrays using the UTF8…
myermian
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4
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HttpClient AutomaticDecompression working with gzip, not deflate

Using both httpbin and Postman Echo (which appear to be the same service, effectively), I'm able to successfully get a gzip'd response with their testing endpoint like this: var cli = new HttpClient(new HttpClientHandler { AutomaticDecompression…
Todd Menier
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Is it possible to recover corrupted Zlib data beyond the corrupted section?

I have a Zip archive with a large (important) file that will not extract. All Zip utilities that I've tried, including those that claim to recover/fix broken Zip archives are unable to extract the file containing the corrupted zlib compressed data.…
SteveG
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4
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3 answers

"Sync flush" for Zlib Deflate

I need a zlib deflate compressed stream. In my implementation I must use a single stream over the entire session. during this session small chunks of data will be passed through the compressed stream. Everytime a chunk is passed it must be sent in…
hultqvist
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4
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2 answers

Zip within a zip opens to undocumented System.IO.Compression.SubReadStream

I have a function I use for aggregating streams from a zip archive. private void ExtractMiscellaneousFiles() { foreach (var miscellaneousFileName in _fileData.MiscellaneousFileNames) { var fileEntry =…
Scotty H
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4
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3 answers

Can't inflate with C# using DeflateStream

I'm using mono to inflate/deflate bytes. Here is the code: public static byte[] Inflate(byte[] data) { using (MemoryStream inStream = new MemoryStream(data)) { using (MemoryStream outStream = new MemoryStream()) …
Agas
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Puzzling .Net C# DeflateStream problem

I wonder if anyone can shed some light on an issue that is driving me nuts: I am writing a compression decompression test class. To test it, I am serializing a dataset to a memory stream, compressing it, and uncompressing it and comparing the…
twiga
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