I've been trying this for a long time but it keeps giving me an error. I have an array of bytes that should represent a nbt document. I would like to convert this into a c# object with a library: fNbt.
Here is my code:
byte[] buffer = Convert.FromBase64String(value);
byte[] decompressed;
using (var inputStream = new MemoryStream(buffer))
{
using var outputStream = new MemoryStream();
using (var gzip = new GZipStream(inputStream, CompressionMode.Decompress, leaveOpen: true))
{
gzip.CopyTo(outputStream);
}
fNbt.NbtReader reader = new fNbt.NbtReader(outputStream, true);
var output = reader.ReadValueAs<AuctionItem>(); //Error: Value already read, or no value to read.
return output;
}
When I try this, it works:
decompressed = outputStream.ToArray();
outputStream.Seek(0, SeekOrigin.Begin);
outputStream.Read(new byte[1000], 0, decompressed.Count() - 1);
But when I try this, it doesn't:
outputStream.Seek(0, SeekOrigin.Begin);
fNbt.NbtReader reader = new fNbt.NbtReader(outputStream, true);
reader.ReadValueAs<AuctionItem>();
NbtReader, like most stream readers, begins reading from the current position of whatever stream you give it. Since you're just done writing to outputStream, then that position is the stream's end. Which means at that point there's nothing to be read.
The solution is to seek the outputStream back to the beginning before reading from it:
outputStream.Seek(0, SeekOrigin.Begin); // <-- seek to the beginning
// Do the read
fNbt.NbtReader reader = new fNbt.NbtReader(outputStream, true);
var output = reader.ReadValueAs<AuctionItem>(); // No error anymore
return output;
The solution is as follows. NbtReader.ReadValueAs does not consider a nbtCompound or nbtList as value. I made this little reader but it is not done yet (I will update the code once it is done).
public static T ReadValueAs<T>(string value) where T: new()
{
byte[] buffer = Convert.FromBase64String(value);
using (var inputStream = new MemoryStream(buffer))
{
using var outputStream = new MemoryStream();
using (var gzip = new GZipStream(inputStream, CompressionMode.Decompress, leaveOpen: true))
{
gzip.CopyTo(outputStream);
}
outputStream.Seek(0, SeekOrigin.Begin);
return new EasyNbt.NbtReader(outputStream).ReadValueAs<T>();
}
}
This is the NbtReader:
private MemoryStream MemStream { get; set; }
public NbtReader(MemoryStream memStream)
{
MemStream = memStream;
}
public T ReadValueAs<T>() where T: new()
{
return ReadTagAs<T>(new fNbt.NbtReader(MemStream, true).ReadAsTag());
}
private T ReadTagAs<T>(fNbt.NbtTag nbtTag)
{
//Reads to the root and adds to T...
}
I'm trying to encode an image into a byte array and send it to a server.
the encoding and sending parts wok fine but my problem is that the byte array is too large and takes too long to send so I thought compressing it would make it go faster. but the actual problem is that I CAN NOT use system.io or streams. and I'm targeting .net 2.0.
Thank you.
using System.IO;
using System.IO.Compression;
code:
public static byte[] Compress(byte[] data)
{
MemoryStream output = new MemoryStream();
using (DeflateStream dstream = new DeflateStream(output, CompressionLevel.Optimal))
{
dstream.Write(data, 0, data.Length);
}
return output.ToArray();
}
public static byte[] Decompress(byte[] data)
{
MemoryStream input = new MemoryStream(data);
MemoryStream output = new MemoryStream();
using (DeflateStream dstream = new DeflateStream(input, CompressionMode.Decompress))
{
dstream.CopyTo(output);
}
return output.ToArray();
}
Updated
Use 7zip library:
http://www.splinter.com.au/compressing-using-the-7zip-lzma-algorithm-in/
// Convert the text into bytes
byte[] DataBytes = ASCIIEncoding.ASCII.GetBytes(OriginalText);
// Compress it
byte[] Compressed = SevenZip.Compression.LZMA.SevenZipHelper.Compress(DataBytes);
// Decompress it
byte[] Decompressed = SevenZip.Compression.LZMA.SevenZipHelper.Decompress(Compressed);
Compress
public static byte[] Compress(byte[] inputData)
{
if (inputData == null)
throw new ArgumentNullException("inputData must be non-null");
MemoryStream output = new MemoryStream();
using (DeflateStream dstream = new DeflateStream(output, CompressionLevel.Optimal))
{
dstream.Write(inputData, 0, inputData.Length);
}
return output.ToArray();
}
OR
public static byte[] Compress(byte[] inputData)
{
if (inputData == null)
throw new ArgumentNullException("inputData must be non-null");
using (var compressIntoMs = new MemoryStream())
{
using (var gzs = new BufferedStream(new GZipStream(compressIntoMs,
CompressionMode.Compress), BUFFER_SIZE))
{
gzs.Write(inputData, 0, inputData.Length);
}
return compressIntoMs.ToArray();
}
}
Decompress
public static byte[] Decompress(byte[] inputData)
{
if (inputData == null)
throw new ArgumentNullException("inputData must be non-null");
MemoryStream input = new MemoryStream(inputData);
MemoryStream output = new MemoryStream();
using (DeflateStream dstream = new DeflateStream(input, CompressionMode.Decompress))
{
dstream.CopyTo(output);
}
return output.ToArray();
if (inputData == null)
throw new ArgumentNullException("inputData must be non-null");
}
OR
public static byte[] Decompress(byte[] inputData)
{
if (inputData == null)
throw new ArgumentNullException("inputData must be non-null");
using (var compressedMs = new MemoryStream(inputData))
{
using (var decompressedMs = new MemoryStream())
{
using (var gzs = new BufferedStream(new GZipStream(compressedMs, CompressionMode.Decompress), BUFFER_SIZE))
{
gzs.CopyTo(decompressedMs);
}
return decompressedMs.ToArray();
}
}
}
I have two MemoryStream instances.
How to merge them into one instance?
Well, now I can't copy from one MemoryStream to another.
Here is a method:
public static Stream ZipFiles(IEnumerable<FileToZip> filesToZip) {
ZipStorer storer = null;
MemoryStream result = null;
try {
MemoryStream memory = new MemoryStream(1024);
storer = ZipStorer.Create(memory, GetDateTimeInRuFormat());
foreach (var currentFilePath in filesToZip) {
string fileName = Path.GetFileName(currentFilePath.FullPath);
storer.AddFile(ZipStorer.Compression.Deflate, currentFilePath.FullPath, fileName,
GetDateTimeInRuFormat());
}
result = new MemoryStream((int) storer.ZipFileStream.Length);
storer.ZipFileStream.CopyTo(result); //Does not work!
//result's length will be zero
}
catch (Exception) {
}
finally {
if (storer != null)
storer.Close();
}
return result;
}
Spectacularly easy with CopyTo or CopyToAsync:
var streamOne = new MemoryStream();
FillThisStreamUp(streamOne);
var streamTwo = new MemoryStream();
DoSomethingToThisStreamLol(streamTwo);
streamTwo.CopyTo(streamOne); // streamOne holds the contents of both
The framework, people. The framework.
Based on the answer shared by #Will above, here is complete code:
void Main()
{
var s1 = GetStreamFromString("Hello");
var s2 = GetStreamFromString(" World");
var s3 = s1.Append(s2);
Console.WriteLine(Encoding.UTF8.GetString((s3 as MemoryStream).ToArray()));
}
public static Stream GetStreamFromString(string text)
{
MemoryStream stream = new MemoryStream();
StreamWriter writer = new StreamWriter(stream);
writer.Write(text);
writer.Flush();
stream.Position = 0;
return stream;
}
public static class Extensions
{
public static Stream Append(this Stream destination, Stream source)
{
destination.Position = destination.Length;
source.CopyTo(destination);
return destination;
}
}
And merging stream collection with async:
async Task Main()
{
var list = new List<Task<Stream>> { GetStreamFromStringAsync("Hello"), GetStreamFromStringAsync(" World") };
Stream stream = await list
.Select(async item => await item)
.Aggregate((current, next) => Task.FromResult(current.Result.Append(next.Result)));
Console.WriteLine(Encoding.UTF8.GetString((stream as MemoryStream).ToArray()));
}
public static Task<Stream> GetStreamFromStringAsync(string text)
{
MemoryStream stream = new MemoryStream();
StreamWriter writer = new StreamWriter(stream);
writer.Write(text);
writer.Flush();
stream.Position = 0;
return Task.FromResult(stream as Stream);
}
public static class Extensions
{
public static Stream Append(this Stream destination, Stream source)
{
destination.Position = destination.Length;
source.CopyTo(destination);
return destination;
}
}
Create third(let it be mergedStream) MemoryStream with length
equal to sum of first and second lengths
Write first MemoryStream to mergedStream (use GetBuffer() to
get byte[] from MemoryStream)
Write second MemoryStream to mergedStream(use GetBuffer())
Remember about offset while writing.
It's rather append, but it's totally unclear what is merge operation on MemoryStreams
I am trying to compress and decompress a Stream using Compression.DeflateStream. Compressing seems to work correctly since the code below compresses my Stream to a 110 bytes long array. However, reading the decompressed Stream results in an empty string.
class Program
{
static void Main(string[] args)
{
// Compress a random string value
string value = Path.GetRandomFileName();
byte[] compressedBytes;
using (var writer = new StreamWriter(new MemoryStream()))
{
writer.Write(value);
writer.Flush();
writer.BaseStream.Position = 0;
compressedBytes = Compress(writer.BaseStream);
}
// Decompress compressed bytes
Stream decompressedStream = Decompress(compressedBytes);
// here already applies: decompressedStream.Length == 0
using (var reader = new StreamReader(decompressedStream))
{
string decompressedValue = reader.ReadToEnd();
if (value == decompressedValue)
Console.WriteLine("Success");
else
Console.WriteLine("Failed");
}
}
private static byte[] Compress(Stream input)
{
using (var compressStream = new MemoryStream())
using (var compressor = new DeflateStream(compressStream, CompressionMode.Compress))
{
input.CopyTo(compressor);
return compressStream.ToArray();
}
}
private static Stream Decompress(byte[] input)
{
var output = new MemoryStream();
using (var compressStream = new MemoryStream(input))
using (var decompressor = new DeflateStream(compressStream, CompressionMode.Decompress))
decompressor.CopyTo(output);
output.Position = 0;
return output;
}
}
Can anyone help me on this one?
Many thanks.
Fix your Compress function:
private static byte[] Compress(Stream input)
{
using(var compressStream = new MemoryStream())
using(var compressor = new DeflateStream(compressStream, CompressionMode.Compress))
{
input.CopyTo(compressor);
compressor.Close();
return compressStream.ToArray();
}
}
compressed stream was not flushed before returning the resulting byte array.
All those answers are far away from ideal form because all of you forgot that "using" disposing and closing streams its means that additional Close() is not needed. I think that ideal code will be like this:
public static class CompressionHelper
{
public static byte[] Compress(byte[] data)
{
byte[] compressArray = null;
try
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (DeflateStream deflateStream = new DeflateStream(memoryStream, CompressionMode.Compress))
{
deflateStream.Write(data, 0, data.Length);
}
compressArray = memoryStream.ToArray();
}
}
catch (Exception exception)
{
// do something !
}
return compressArray;
}
public static byte[] Decompress(byte[] data)
{
byte[] decompressedArray = null;
try
{
using (MemoryStream decompressedStream = new MemoryStream())
{
using (MemoryStream compressStream = new MemoryStream(data))
{
using (DeflateStream deflateStream = new DeflateStream(compressStream, CompressionMode.Decompress))
{
deflateStream.CopyTo(decompressedStream);
}
}
decompressedArray = decompressedStream.ToArray();
}
}
catch (Exception exception)
{
// do something !
}
return decompressedArray;
}
}
Try closing the streams:
class Program
{
static void Main(string[] args)
{
// Compress a random string value
string value = DateTime.Now.ToLongTimeString();
byte[] compressedBytes;
using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(value)))
{
compressedBytes = Compress(stream);
}
// Decompress compressed bytes
using (var decompressedStream = Decompress(compressedBytes))
using (var reader = new StreamReader(decompressedStream))
{
string decompressedValue = reader.ReadToEnd();
if (value == decompressedValue)
Console.WriteLine("Success");
else
Console.WriteLine("Failed");
}
}
public static byte[] Compress(Stream input)
{
using (var compressedStream = new MemoryStream())
using (var zipStream = new GZipStream(compressedStream, CompressionMode.Compress))
{
input.CopyTo(zipStream);
zipStream.Close();
return compressedStream.ToArray();
}
}
public static Stream Decompress(byte[] data)
{
var output = new MemoryStream();
using(var compressedStream = new MemoryStream(data))
using(var zipStream = new GZipStream(compressedStream, CompressionMode.Decompress))
{
zipStream.CopyTo(output);
zipStream.Close();
output.Position = 0;
return output;
}
}
}
I am newbie in .net. I am doing compression and decompression string in C#. There is a XML and I am converting in string and after that I am doing compression and decompression.There is no compilation error in my code except when I decompression my code and return my string, its returning only half of the XML.
Below is my code, please correct me where I am wrong.
Code:
class Program
{
public static string Zip(string value)
{
//Transform string into byte[]
byte[] byteArray = new byte[value.Length];
int indexBA = 0;
foreach (char item in value.ToCharArray())
{
byteArray[indexBA++] = (byte)item;
}
//Prepare for compress
System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.Compression.GZipStream sw = new System.IO.Compression.GZipStream(ms, System.IO.Compression.CompressionMode.Compress);
//Compress
sw.Write(byteArray, 0, byteArray.Length);
//Close, DO NOT FLUSH cause bytes will go missing...
sw.Close();
//Transform byte[] zip data to string
byteArray = ms.ToArray();
System.Text.StringBuilder sB = new System.Text.StringBuilder(byteArray.Length);
foreach (byte item in byteArray)
{
sB.Append((char)item);
}
ms.Close();
sw.Dispose();
ms.Dispose();
return sB.ToString();
}
public static string UnZip(string value)
{
//Transform string into byte[]
byte[] byteArray = new byte[value.Length];
int indexBA = 0;
foreach (char item in value.ToCharArray())
{
byteArray[indexBA++] = (byte)item;
}
//Prepare for decompress
System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArray);
System.IO.Compression.GZipStream sr = new System.IO.Compression.GZipStream(ms,
System.IO.Compression.CompressionMode.Decompress);
//Reset variable to collect uncompressed result
byteArray = new byte[byteArray.Length];
//Decompress
int rByte = sr.Read(byteArray, 0, byteArray.Length);
//Transform byte[] unzip data to string
System.Text.StringBuilder sB = new System.Text.StringBuilder(rByte);
//Read the number of bytes GZipStream red and do not a for each bytes in
//resultByteArray;
for (int i = 0; i < rByte; i++)
{
sB.Append((char)byteArray[i]);
}
sr.Close();
ms.Close();
sr.Dispose();
ms.Dispose();
return sB.ToString();
}
static void Main(string[] args)
{
XDocument doc = XDocument.Load(#"D:\RSP.xml");
string val = doc.ToString(SaveOptions.DisableFormatting);
val = Zip(val);
val = UnZip(val);
}
}
My XML size is 63KB.
The code to compress/decompress a string
public static void CopyTo(Stream src, Stream dest) {
byte[] bytes = new byte[4096];
int cnt;
while ((cnt = src.Read(bytes, 0, bytes.Length)) != 0) {
dest.Write(bytes, 0, cnt);
}
}
public static byte[] Zip(string str) {
var bytes = Encoding.UTF8.GetBytes(str);
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream()) {
using (var gs = new GZipStream(mso, CompressionMode.Compress)) {
//msi.CopyTo(gs);
CopyTo(msi, gs);
}
return mso.ToArray();
}
}
public static string Unzip(byte[] bytes) {
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream()) {
using (var gs = new GZipStream(msi, CompressionMode.Decompress)) {
//gs.CopyTo(mso);
CopyTo(gs, mso);
}
return Encoding.UTF8.GetString(mso.ToArray());
}
}
static void Main(string[] args) {
byte[] r1 = Zip("StringStringStringStringStringStringStringStringStringStringStringStringStringString");
string r2 = Unzip(r1);
}
Remember that Zip returns a byte[], while Unzip returns a string. If you want a string from Zip you can Base64 encode it (for example by using Convert.ToBase64String(r1)) (the result of Zip is VERY binary! It isn't something you can print to the screen or write directly in an XML)
The version suggested is for .NET 2.0, for .NET 4.0 use the MemoryStream.CopyTo.
IMPORTANT: The compressed contents cannot be written to the output stream until the GZipStream knows that it has all of the input (i.e., to effectively compress it needs all of the data). You need to make sure that you Dispose() of the GZipStream before inspecting the output stream (e.g., mso.ToArray()). This is done with the using() { } block above. Note that the GZipStream is the innermost block and the contents are accessed outside of it. The same goes for decompressing: Dispose() of the GZipStream before attempting to access the data.
according to
this snippet
i use this code and it's working fine:
using System;
using System.IO;
using System.IO.Compression;
using System.Text;
namespace CompressString
{
internal static class StringCompressor
{
/// <summary>
/// Compresses the string.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
public static string CompressString(string text)
{
byte[] buffer = Encoding.UTF8.GetBytes(text);
var memoryStream = new MemoryStream();
using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Compress, true))
{
gZipStream.Write(buffer, 0, buffer.Length);
}
memoryStream.Position = 0;
var compressedData = new byte[memoryStream.Length];
memoryStream.Read(compressedData, 0, compressedData.Length);
var gZipBuffer = new byte[compressedData.Length + 4];
Buffer.BlockCopy(compressedData, 0, gZipBuffer, 4, compressedData.Length);
Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gZipBuffer, 0, 4);
return Convert.ToBase64String(gZipBuffer);
}
/// <summary>
/// Decompresses the string.
/// </summary>
/// <param name="compressedText">The compressed text.</param>
/// <returns></returns>
public static string DecompressString(string compressedText)
{
byte[] gZipBuffer = Convert.FromBase64String(compressedText);
using (var memoryStream = new MemoryStream())
{
int dataLength = BitConverter.ToInt32(gZipBuffer, 0);
memoryStream.Write(gZipBuffer, 4, gZipBuffer.Length - 4);
var buffer = new byte[dataLength];
memoryStream.Position = 0;
using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress))
{
gZipStream.Read(buffer, 0, buffer.Length);
}
return Encoding.UTF8.GetString(buffer);
}
}
}
}
With the advent of .NET 4.0 (and higher) with the Stream.CopyTo() methods, I thought I would post an updated approach.
I also think the below version is useful as a clear example of a self-contained class for compressing regular strings to Base64 encoded strings, and vice versa:
public static class StringCompression
{
/// <summary>
/// Compresses a string and returns a deflate compressed, Base64 encoded string.
/// </summary>
/// <param name="uncompressedString">String to compress</param>
public static string Compress(string uncompressedString)
{
byte[] compressedBytes;
using (var uncompressedStream = new MemoryStream(Encoding.UTF8.GetBytes(uncompressedString)))
{
using (var compressedStream = new MemoryStream())
{
// setting the leaveOpen parameter to true to ensure that compressedStream will not be closed when compressorStream is disposed
// this allows compressorStream to close and flush its buffers to compressedStream and guarantees that compressedStream.ToArray() can be called afterward
// although MSDN documentation states that ToArray() can be called on a closed MemoryStream, I don't want to rely on that very odd behavior should it ever change
using (var compressorStream = new DeflateStream(compressedStream, CompressionLevel.Fastest, true))
{
uncompressedStream.CopyTo(compressorStream);
}
// call compressedStream.ToArray() after the enclosing DeflateStream has closed and flushed its buffer to compressedStream
compressedBytes = compressedStream.ToArray();
}
}
return Convert.ToBase64String(compressedBytes);
}
/// <summary>
/// Decompresses a deflate compressed, Base64 encoded string and returns an uncompressed string.
/// </summary>
/// <param name="compressedString">String to decompress.</param>
public static string Decompress(string compressedString)
{
byte[] decompressedBytes;
var compressedStream = new MemoryStream(Convert.FromBase64String(compressedString));
using (var decompressorStream = new DeflateStream(compressedStream, CompressionMode.Decompress))
{
using (var decompressedStream = new MemoryStream())
{
decompressorStream.CopyTo(decompressedStream);
decompressedBytes = decompressedStream.ToArray();
}
}
return Encoding.UTF8.GetString(decompressedBytes);
}
}
Here’s another approach using the extension methods technique to extend the String class to add string compression and decompression. You can drop the class below into an existing project and then use thusly:
var uncompressedString = "Hello World!";
var compressedString = uncompressedString.Compress();
and
var decompressedString = compressedString.Decompress();
To wit:
public static class Extensions
{
/// <summary>
/// Compresses a string and returns a deflate compressed, Base64 encoded string.
/// </summary>
/// <param name="uncompressedString">String to compress</param>
public static string Compress(this string uncompressedString)
{
byte[] compressedBytes;
using (var uncompressedStream = new MemoryStream(Encoding.UTF8.GetBytes(uncompressedString)))
{
using (var compressedStream = new MemoryStream())
{
// setting the leaveOpen parameter to true to ensure that compressedStream will not be closed when compressorStream is disposed
// this allows compressorStream to close and flush its buffers to compressedStream and guarantees that compressedStream.ToArray() can be called afterward
// although MSDN documentation states that ToArray() can be called on a closed MemoryStream, I don't want to rely on that very odd behavior should it ever change
using (var compressorStream = new DeflateStream(compressedStream, CompressionLevel.Fastest, true))
{
uncompressedStream.CopyTo(compressorStream);
}
// call compressedStream.ToArray() after the enclosing DeflateStream has closed and flushed its buffer to compressedStream
compressedBytes = compressedStream.ToArray();
}
}
return Convert.ToBase64String(compressedBytes);
}
/// <summary>
/// Decompresses a deflate compressed, Base64 encoded string and returns an uncompressed string.
/// </summary>
/// <param name="compressedString">String to decompress.</param>
public static string Decompress(this string compressedString)
{
byte[] decompressedBytes;
var compressedStream = new MemoryStream(Convert.FromBase64String(compressedString));
using (var decompressorStream = new DeflateStream(compressedStream, CompressionMode.Decompress))
{
using (var decompressedStream = new MemoryStream())
{
decompressorStream.CopyTo(decompressedStream);
decompressedBytes = decompressedStream.ToArray();
}
}
return Encoding.UTF8.GetString(decompressedBytes);
}
}
I like #fubo's answer the best but I think this is much more elegant.
This method is more compatible because it doesn't manually store the length up front.
Also I've exposed extensions to support compression for string to string, byte[] to byte[], and Stream to Stream.
public static class ZipExtensions
{
public static string CompressToBase64(this string data)
{
return Convert.ToBase64String(Encoding.UTF8.GetBytes(data).Compress());
}
public static string DecompressFromBase64(this string data)
{
return Encoding.UTF8.GetString(Convert.FromBase64String(data).Decompress());
}
public static byte[] Compress(this byte[] data)
{
using (var sourceStream = new MemoryStream(data))
using (var destinationStream = new MemoryStream())
{
sourceStream.CompressTo(destinationStream);
return destinationStream.ToArray();
}
}
public static byte[] Decompress(this byte[] data)
{
using (var sourceStream = new MemoryStream(data))
using (var destinationStream = new MemoryStream())
{
sourceStream.DecompressTo(destinationStream);
return destinationStream.ToArray();
}
}
public static void CompressTo(this Stream stream, Stream outputStream)
{
using (var gZipStream = new GZipStream(outputStream, CompressionMode.Compress))
{
stream.CopyTo(gZipStream);
gZipStream.Flush();
}
}
public static void DecompressTo(this Stream stream, Stream outputStream)
{
using (var gZipStream = new GZipStream(stream, CompressionMode.Decompress))
{
gZipStream.CopyTo(outputStream);
}
}
}
This is an updated version for .NET 4.5 and newer using async/await and IEnumerables:
public static class CompressionExtensions
{
public static async Task<IEnumerable<byte>> Zip(this object obj)
{
byte[] bytes = obj.Serialize();
using (MemoryStream msi = new MemoryStream(bytes))
using (MemoryStream mso = new MemoryStream())
{
using (var gs = new GZipStream(mso, CompressionMode.Compress))
await msi.CopyToAsync(gs);
return mso.ToArray().AsEnumerable();
}
}
public static async Task<object> Unzip(this byte[] bytes)
{
using (MemoryStream msi = new MemoryStream(bytes))
using (MemoryStream mso = new MemoryStream())
{
using (var gs = new GZipStream(msi, CompressionMode.Decompress))
{
// Sync example:
//gs.CopyTo(mso);
// Async way (take care of using async keyword on the method definition)
await gs.CopyToAsync(mso);
}
return mso.ToArray().Deserialize();
}
}
}
public static class SerializerExtensions
{
public static byte[] Serialize<T>(this T objectToWrite)
{
using (MemoryStream stream = new MemoryStream())
{
BinaryFormatter binaryFormatter = new BinaryFormatter();
binaryFormatter.Serialize(stream, objectToWrite);
return stream.GetBuffer();
}
}
public static async Task<T> _Deserialize<T>(this byte[] arr)
{
using (MemoryStream stream = new MemoryStream())
{
BinaryFormatter binaryFormatter = new BinaryFormatter();
await stream.WriteAsync(arr, 0, arr.Length);
stream.Position = 0;
return (T)binaryFormatter.Deserialize(stream);
}
}
public static async Task<object> Deserialize(this byte[] arr)
{
object obj = await arr._Deserialize<object>();
return obj;
}
}
With this you can serialize everything BinaryFormatter supports, instead only of strings.
Edit:
In case, you need take care of Encoding, you could just use Convert.ToBase64String(byte[])...
Take a look at this answer if you need an example!
For those who still getting The magic number in GZip header is not correct. Make sure you are passing in a GZip stream. ERROR
and if your string was zipped using php you'll need to do something like:
public static string decodeDecompress(string originalReceivedSrc) {
byte[] bytes = Convert.FromBase64String(originalReceivedSrc);
using (var mem = new MemoryStream()) {
//the trick is here
mem.Write(new byte[] { 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00 }, 0, 8);
mem.Write(bytes, 0, bytes.Length);
mem.Position = 0;
using (var gzip = new GZipStream(mem, CompressionMode.Decompress))
using (var reader = new StreamReader(gzip)) {
return reader.ReadToEnd();
}
}
}
We can reduce code complexity by using StreamReader and StreamWriter rather than manually converting strings to byte arrays. Three streams is all you need:
public static byte[] Zip(string uncompressed)
{
byte[] ret;
using (var outputMemory = new MemoryStream())
{
using (var gz = new GZipStream(outputMemory, CompressionLevel.Optimal))
{
using (var sw = new StreamWriter(gz, Encoding.UTF8))
{
sw.Write(uncompressed);
}
}
ret = outputMemory.ToArray();
}
return ret;
}
public static string Unzip(byte[] compressed)
{
string ret = null;
using (var inputMemory = new MemoryStream(compressed))
{
using (var gz = new GZipStream(inputMemory, CompressionMode.Decompress))
{
using (var sr = new StreamReader(gz, Encoding.UTF8))
{
ret = sr.ReadToEnd();
}
}
}
return ret;
}
For .net6 cross platform Compression/Decompression string with C# using SharpZipLib library. Test for ubuntu(18.0.x) and windows.
#region helper
private byte[] Zip(string text)
{
if (text == null)
return null;
byte[] ret;
using (var outputMemory = new MemoryStream())
{
using (var gz = new GZipStream(outputMemory, CompressionLevel.Optimal))
{
using (var sw = new StreamWriter(gz, Encoding.UTF8))
{
sw.Write(text);
}
}
ret = outputMemory.ToArray();
}
return ret;
}
private string Unzip(byte[] bytes)
{
string ret = null;
using (var inputMemory = new MemoryStream(bytes))
{
using (var gz = new GZipStream(inputMemory, CompressionMode.Decompress))
{
using (var sr = new StreamReader(gz, Encoding.UTF8))
{
ret = sr.ReadToEnd();
}
}
}
return ret;
}
#endregion