gzipstream

问题 How can you decompress a string of text in Python 3, that has been compressed with gzip and converted to base 64? For example, the text: EgAAAB+LCAAAAAAABAALycgsVgCi4vzcVAWFktSKEgC9n1/fEgAAAA== Should convert to: This is some text The following C# code successfully does this: var gzBuffer = Convert.FromBase64String(compressedText); using (var ms = new MemoryStream()) { int msgLength = BitConverter.ToInt32(gzBuffer, 0); ms.Write(gzBuffer, 4, gzBuffer.Length - 4); var buffer = new byte

问题 Under heavy load I see lot of threads getting locked when GZipping and decompressing the JSP file. The thread dump looks like below. Seems to be coming from "header.jsp" which is of size 14Kb. http-0.0.0.0-8080-304" daemon prio=3 tid=0x0000000008bcc000 nid=0x302 runnable [0xfffffd7de7bc2000] java.lang.Thread.State: RUNNABLE at java.util.zip.Deflater.deflateBytes(Native Method) at java.util.zip.Deflater.deflate(Deflater.java:306) - locked <0xfffffd7e589078e8> (a java.util.zip.ZStreamRef) at

问题 I want to to compress and encrypt a file in one go by using this simple code: public void compress(FileInfo fi, Byte[] pKey, Byte[] pIV) { // Get the stream of the source file. using (FileStream inFile = fi.OpenRead()) { // Create the compressed encrypted file. using (FileStream outFile = File.Create(fi.FullName + ".pebf")) { using (CryptoStream encrypt = new CryptoStream(outFile, Rijndael.Create().CreateEncryptor(pKey, pIV), CryptoStreamMode.Write)) { using (DeflateStream cmprss = new

问题 I want to to compress and encrypt a file in one go by using this simple code: public void compress(FileInfo fi, Byte[] pKey, Byte[] pIV) { // Get the stream of the source file. using (FileStream inFile = fi.OpenRead()) { // Create the compressed encrypted file. using (FileStream outFile = File.Create(fi.FullName + ".pebf")) { using (CryptoStream encrypt = new CryptoStream(outFile, Rijndael.Create().CreateEncryptor(pKey, pIV), CryptoStreamMode.Write)) { using (DeflateStream cmprss = new

问题 Is there a way to know if the byte[] has been compressed (or not) by GzipStream .net class? EDIT: Just want to know if the byte[] array has been compressed (since I will always be using GzipStream to compress and decompress) 回答1: A GZipStream is a DeflateStream with an additional header and trailer. The format is specified in RFC 1952. The .NET 4.0 GZipStream class writes the following bytes as header: byte[] headerBytes = new byte[] { 0x1f, 0x8b, 8, 0, 0, 0, 0, 0, 4, 0 }; if

问题 I'm probably doing something obviously stupid here. Please point it out! I have some C# code that is pulling down a bunch of .gz files from SFTP (using the SSH.NET Nuget package - works great!). Each gz contains only a single .CSV file inside of them. I want to keep these files in memory without hitting disk (yes, I know, server memory management concerns exist - that's fine as these files are fairly small), decompress them in memory to extract the CSV file inside, and then return a

问题 I'm probably doing something obviously stupid here. Please point it out! I have some C# code that is pulling down a bunch of .gz files from SFTP (using the SSH.NET Nuget package - works great!). Each gz contains only a single .CSV file inside of them. I want to keep these files in memory without hitting disk (yes, I know, server memory management concerns exist - that's fine as these files are fairly small), decompress them in memory to extract the CSV file inside, and then return a

问题 I've got a pesky problem with gzipstream targeting .Net 3.5. This is my first time working with gzipstream, however I have modeled after a number of tutorials including here and I'm still stuck. My app serializes a datatable to xml and inserts into a database, storing the compressed data into a varbinary(max) field as well as the original length of the uncompressed buffer. Then, when I need it, I retrieve this data and decompress it and recreates the datatable. The decompress is what seems to

问题 I've got a pesky problem with gzipstream targeting .Net 3.5. This is my first time working with gzipstream, however I have modeled after a number of tutorials including here and I'm still stuck. My app serializes a datatable to xml and inserts into a database, storing the compressed data into a varbinary(max) field as well as the original length of the uncompressed buffer. Then, when I need it, I retrieve this data and decompress it and recreates the datatable. The decompress is what seems to

问题 I can't get to use GZipStream class in my C# ASP.NET 4.5 application. I get the error: The type or namespace name 'GZipStream' could not be found (are you missing a using directive or an assembly reference?) I tried using using System.IO; but the System.IO.Compression is not available in the "Reference Manager" in visual studio. I right click on the object name to see if Visual Studio finds the relevant reference but it does not. Any suggestions? 回答1: Need to add reference to System.dll