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  • decompress .gz file in batch

    - by kapildalwani
    I have 100 of .gz files which I need to de-compress. I have couple of questions a) I am using the code given at http://www.roseindia.net/java/beginners/JavaUncompress.shtml to decompress the .gz file. Its working fine. Quest:- is there a way to get the file name of the zipped file. I know that Zip class of Java gives of enumeration of entery file to work upon. This can give me the filename, size etc stored in .zip file. But, do we have the same for .gz files or does the file name is same as filename.gz with .gz removed. b) is there another elegant way to decompress .gz file by calling the utility function in the java code. Like calling 7-zip application from your java class. Then, I don't have to worry about input/output stream. Thanks in advance. Kapil

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  • RAR Decompress on iPhone Device

    - by DenVog
    Has anyone found a solution to decompressing RAR files on iPhone (not Jailbroken)? It would be great if there was a library similar to libz. I did not find anything official from [URL="http://www.rarlab.com/"]RARlab[/URL]. Anyone successful with integrating [URL="http://wdtz.org/iphone/unrar/"]unRAR[/URL] into their app? The source code appears to be C++? I know that this has been asked before, but I've not seen a solution other than porting unRAR which is beyond me. Would greatly appreciate any information or suggestions. Thank you.

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  • Decompress a PSC File

    - by Kevin Laity
    I need to restore a database that was backed up using navicat's compressed backup feature. But on the restore, there's an error coming up on one of the tables. I can't look at the SQL statements in the file directly because they're compressed, and I don't know what compression format it's in. Does anyone know of a way to decompress this file into a regular text file?

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  • Django automatically compress Model Field on save() and decompress when field is accessed

    - by Brian M. Hunt
    Given a Django model likeso: from django.db import models class MyModel(models.Model): textfield = models.TextField() How can one automatically compress textfield (e.g. with zlib) on save() and decompress it when the property textfield is accessed (i.e. not on load), with a workflow like this: m = MyModel() textfield = "Hello, world, how are you?" m.save() # compress textfield on save m.textfield # no decompression id = m.id() m = MyModel.get(pk=id) # textfield still compressed m.textfield # textfield decompressed I'd be inclined to think that you would overload MyModel.save, but I don't know the pattern for in-place modification of the element when saving. I also don't know the best way in Django to decompress when the field when it's accessed (overload __getattr__?). Or would a better way to do this be to have a custom field type? I'm certain I've seen an example of almost exactly this, but alas I've not been able to find it recently. Thank you for reading – and for any input you may be able to provide.

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  • Decompress a GZipped response from the server (Socket)

    - by Lith
    Umm, ok, after sending some data to the server, noting this particular part: "Accept-Encoding: gzip,deflate\r\n" I am getting the following response: HTTP/1.1 200 OK Server: nginx Date: Fri, 09 Apr 2010 23:25:27 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive X-Powered-By: PHP/5.2.8 Expires: Mon, 26 Jul 1997 05:00:00 GMT Last-Modified: Fri, 09 Apr 2010 23:25:27 GMT Cache-Control: no-store, no-cache, must-revalidate Cache-Control: post-check=0, pre-check=0 Pragma: no-cache Content-Encoding: gzip Vary: Accept-Encoding 7aa ??U-?Rh?%?2?w??PM]??7?qZ?K?)???2?&??m???"q??/p9w?????x?[`tA!G???G?5z??????a>k????????Q ???N?? ('??f?,(??Y:5B???-?)?3x^0e:j?`,???**???F>G)?2????@???b??????A?k???Ar?n? But how do I decompress it? Note that I am using the Socket Class to do all the work. I know how to decompress it, but the problem here lies in the fact that I cannot separate the Packet from the GZipped data, psuedo-psuedocode (or whatever) on how I do it: Socket sends packet; Socket reads response from server, stores into a ByteArray; Create MemoryStream, use ByteArray; Create GZipStream, use Memorystream; now the problem occurs; I am getting the following Error: System.IO.InvalidDataException The magic number in GZip header is not correct. Make sure you are passing in a GZip stream. I hope the explanation is clear enough __.

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  • unable to decompress a *.tar.xz file

    - by neubert
    Per http://askubuntu.com/a/107976 I tried tar xf php-5.6.0RC4.tar.xz and tar -xJf php-5.6.0RC4.tar.xz and in both cases I get the following: tar (child): xz: Cannot exec: No such file or directory tar (child): Error is not recoverable: exiting now tar: Child returned status 2 tar: Error is not recoverable: exiting now Here's php-5.6.0RC4.tar.xz: http://downloads.php.net/tyrael/php-5.6.0RC4.tar.xz I'm running Ubuntu 14.04 LTS.

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  • Decompress PNG using zlib

    - by darkie15
    Hi All, How can I use zlib library to decompress a PNG file? I have no idea how to read a PNG file. When I opened a PNG file in TextPad(a text editor), the data was not at all understandable. Is it because a PNG file is compressed? Any help is greatly appreciated. I need to read a PNG file using a C program and gcc compiler. Regards, darkie

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  • Compress/Decompress NSString in objective-c (iphone) using GZIP or deflate

    - by Steven
    Hi, I have a web-service running on Windows Azure which returns JSON that I consume in my iPhone app. Unfortunately, Windows Azure doesn't seem to support the compression of dynamic responses yet (long story) so I decided to get around it by returning an uncompressed JSON package, which contains a compressed (using GZIP) string. e.g {"Error":null,"IsCompressed":true,"Success":true,"Value":"vWsAAB+LCAAAAAAAB..etc.."} ... where value is the compressed string of a complex object represented in JSON. This was really easy to implement on the server, but for the life of me I can't figure out how to decompress a gzipped NSString into an uncompressed NSString, all the examples I can find for zlib etc are dealing with files etc. Can anyone give me any clues on how to do this? (I'd also be happy for a solution that used deflate as I could change the server-side implementation to use deflate too). Thanks!! Steven Edit 1: Aaah, I see that ASIHTTPRequest is using the following function in it's source code: //uncompress gzipped data with zlib + (NSData *)uncompressZippedData:(NSData*)compressedData; ... and I'm aware that I can convert NSString to NSData, so I'll see if this leads me anywhere!

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  • How to decompress/inflate an XML response from ASP

    - by krisg
    Can anyone provide some insight into how i'd go about decompressing an XML response in classic ASP. We've been handed some code and asked to get it working: Set oXMLHttp = Server.CreateObject("MSXML2.ServerXMLHTTP") URL = HttpServer + re_domain + ".do;jsessionid=" + ue_session + "?" + data oXMLHttp.setTimeouts 5000, 60000, 1200000, 1200000 oXMLHttp.open "GET", URL, false oXMLHttp.setRequestHeader "Accept-Encoding", "gzip" oXMLHttp.send() if oXMLHttp.status = 200 Then if oXMLHttp.responseText = "" then htmlrequest_get = "Empty Response from Server" else htmlrequest_get = oXMLHttp.responseText end if else ... Apparently now that the response is compressed using gzip, we have to un-compress the XML response before we can start to work with the data. How should i go about this?

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  • UI not updated while using ProgressMonitorInputStream in Swing to monitor compressed file decompress

    - by Bozhidar Batsov
    I'm working on swing application that relies on an embedded H2 database. Because I don't want to bundle the database with the app(the db is frequently updated and I want new users of the app to start with a recent copy), I've implemented a solution which downloads a compressed copy of the db the first time the application is started and extracts it. Since the extraction process might be slow I've added a ProgressMonitorInputStream to show to progress of the extraction process - unfortunately when the extraction starts, the progress dialog shows up but it's not updated at all. It seems like to events are getting through to the event dispatch thread. Here is the method: public static String extractDbFromArchive(String pathToArchive) { if (SwingUtilities.isEventDispatchThread()) { System.out.println("Invoking on event dispatch thread"); } // Get the current path, where the database will be extracted String currentPath = System.getProperty("user.home") + File.separator + ".spellbook" + File.separator; LOGGER.info("Current path: " + currentPath); try { //Open the archive FileInputStream archiveFileStream = new FileInputStream(pathToArchive); // Read two bytes from the stream before it used by CBZip2InputStream for (int i = 0; i < 2; i++) { archiveFileStream.read(); } // Open the gzip file and open the output file CBZip2InputStream bz2 = new CBZip2InputStream(new ProgressMonitorInputStream( null, "Decompressing " + pathToArchive, archiveFileStream)); FileOutputStream out = new FileOutputStream(ARCHIVED_DB_NAME); LOGGER.info("Decompressing the tar file..."); // Transfer bytes from the compressed file to the output file byte[] buffer = new byte[1024]; int len; while ((len = bz2.read(buffer)) > 0) { out.write(buffer, 0, len); } // Close the file and stream bz2.close(); out.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } try { TarInputStream tarInputStream = null; TarEntry tarEntry; tarInputStream = new TarInputStream(new ProgressMonitorInputStream( null, "Extracting " + ARCHIVED_DB_NAME, new FileInputStream(ARCHIVED_DB_NAME))); tarEntry = tarInputStream.getNextEntry(); byte[] buf1 = new byte[1024]; LOGGER.info("Extracting tar file"); while (tarEntry != null) { //For each entry to be extracted String entryName = currentPath + tarEntry.getName(); entryName = entryName.replace('/', File.separatorChar); entryName = entryName.replace('\\', File.separatorChar); LOGGER.info("Extracting entry: " + entryName); FileOutputStream fileOutputStream; File newFile = new File(entryName); if (tarEntry.isDirectory()) { if (!newFile.mkdirs()) { break; } tarEntry = tarInputStream.getNextEntry(); continue; } fileOutputStream = new FileOutputStream(entryName); int n; while ((n = tarInputStream.read(buf1, 0, 1024)) > -1) { fileOutputStream.write(buf1, 0, n); } fileOutputStream.close(); tarEntry = tarInputStream.getNextEntry(); } tarInputStream.close(); } catch (Exception e) { } currentPath += "db" + File.separator + DB_FILE_NAME; if (!currentPath.isEmpty()) { LOGGER.info("DB placed in : " + currentPath); } return currentPath; } This method gets invoked on the event dispatch thread (SwingUtilities.isEventDispatchThread() returns true) so the UI components should be updated. I haven't implemented this as an SwingWorker since I need to wait for the extraction anyways before I can proceed with the initialization of the program. This method get invoked before the main JFrame of the application is visible. I don't won't a solution based on SwingWorker + property changed listeners - I think that the ProgressMonitorInputStream is exactly what I need, but I guess I'm not doing something right. I'm using Sun JDK 1.6.18. Any help would be greatly appreciated.

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  • .NET: Is it possible to get HttpWebRequest to automatically decompress gzip'd responses?

    - by Cheeso
    In this answer, I described how I resorted to wrappnig a GZipStream around the response stream in a HttpWebResponse, in order to decompress it. The relevant code looks like this: HttpWebRequest hwr = (HttpWebRequest) WebRequest.Create(url); hwr.CookieContainer = PersistentCookies.GetCookieContainerForUrl(url); hwr.Accept = "text/xml, */*"; hwr.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate"); hwr.Headers.Add(HttpRequestHeader.AcceptLanguage, "en-us"); hwr.UserAgent = "My special app"; hwr.KeepAlive = true; var resp = (HttpWebResponse) hwr.GetResponse(); using(Stream s = resp.GetResponseStream()) { Stream s2 = s; if (resp.ContentEncoding.ToLower().Contains("gzip")) s2 = new GZipStream(s2, CompressionMode.Decompress); else if (resp.ContentEncoding.ToLower().Contains("deflate")) s2 = new DeflateStream(s2, CompressionMode.Decompress); ... use s2 ... } Is there a way to get HttpWebResponse to provide a de-compressing stream, automatically? In other words, a way for me to eliminate the following from the above code: Stream s2 = s; if (resp.ContentEncoding.ToLower().Contains("gzip")) s2 = new GZipStream(s2, CompressionMode.Decompress); else if (resp.ContentEncoding.ToLower().Contains("deflate")) s2 = new DeflateStream(s2, CompressionMode.Decompress); Thanks.

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  • Decoding a compressed short string; uncertain on compression used - Updated

    - by James
    Hi, I have a program that is compressing a string in an unknown way. I know a few inputs and the output produced, but I am not sure what is being used to compress the string. Here are my examples. (just 38 x a, no spaces or anything else) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Out: "026900211AA63000026900"   (just 32 x a) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Out: "0209001c1aa7a000020900" (31 x a, then 1 b) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab" Out: "0209000177c553c000020900" (31 x b, then 1 a) In: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbba" Out: "0209001e7754f38000020900" In: "Hey wot u doing 2day u wanna do something" Out: "02990011C7C62E78CE6B8E3ACD83E81B37C5C5A6B9D1E1B06963DB5E71155C1000029900" (same as previous string, but with a space at the end) In: "Hey wot u doing 2day u wanna do something " Out: "02A90012C7718B9E339AE2EB360FA02CDF17177A674786DF4B1EDAF388AAE08000000002A90000" The only definite thing I can see so far is digit 2 and 3 are the amount of characters (hex value), ie first one is 26 = 38 Also the first 6 digits are repeated at the end Any help / advice would be great, thanks!

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  • How can I decompress a gzip stream with zlib?

    - by Greg Hewgill
    Gzip format files (created with the gzip program, for example) use the "deflate" compression algorithm, which is the same compression algorithm as what zlib uses. However, when using zlib to inflate a gzip compressed file, the library returns a Z_DATA_ERROR. How can I use zlib to decompress a gzip file?

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  • How to compress/decompress a long query string in PHP?

    - by jodeci
    I doubt if this is encryption but I can't find a better phrase. I need to pass a long query string like this: http://test.com/test.php?key=[some_very_loooooooooooooooooooooooong_query_string] The query string contains NO sensitive information so I'm not really concerned about security in this case. It's just...well, too long and ugly. Is there a library function that can let me encode/encrypt/compress the query string into something similar to the result of a md5() (similar as in, always a 32 character string), but decode/decrypt/decompress-able?

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  • Need PHP script to decompress and loop through zipped file.

    - by Jim H.
    I am using a fairly straight-forward script to open and parse several xml files that are gzipped. I also need to do the same basic operation with a ZIP file. It seems like it should be simple, but I haven't been able to find what looked like equivalent code anywhere. Here is the simple version of what I am already doing: $import_file = "source.gz"; $sfp = gzopen($import_file, "rb"); ///// OPEN GZIPPED data while ($string = gzread($sfp, 4096)) { //Loop through the data /// Parse Output And Do Stuff with $string } gzclose($sfp); What would do the same thing for a zipped file?

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  • How exactly does processing files work on AFP shares?

    - by Oliver Joseph Ash
    I recently made myself a NAS, and I’ve been wondering about how AFP shares work. If I have a ZIP on the AFP share, and I use Finder to decompress the file, what will the process for decompressing this file be? Will it read the file into memory on my Mac, process it, and then write the results to the AFP share? I’ve been wondering because if I login via SSH to decompress, I seem to get faster results.

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  • Reading a memorystream

    - by user1842828
    Using several examples here on StackOverflow I thought the following code would decompress a gzip file then read the memory-stream and write it's content to the console. No errors occur but I get no output. public static void Decompress(FileInfo fileToDecompress) { using (FileStream originalFileStream = fileToDecompress.OpenRead()) { string currentFileName = fileToDecompress.FullName; string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length); using (FileStream decompressedFileStream = File.Create(newFileName)) { using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress)) { MemoryStream memStream = new MemoryStream(); memStream.SetLength(decompressedFileStream.Length); decompressedFileStream.Read(memStream.GetBuffer(), 0, (int)decompressedFileStream.Length); memStream.Position = 0; var sr = new StreamReader(memStream); var myStr = sr.ReadToEnd(); Console.WriteLine("Stream Output: " + myStr); } } } }

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  • Producer / Consumer - I/O Disk

    - by Pedro Magalhaes
    Hi, I have a compressed file in the disk, that a partitioned in blocks. I read a block from disk decompress it to memory and the read the data. It is possible to create a producer/consumer, one thread that recovers compacted blocks from disk and put in a queue and another thread that decompress and read the data? Will the performance be better? Thanks!

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  • Error -3 while decompressing data: incorrect header check

    - by Rahul99
    I have .zip file which contain csv data. I am reading .zip file using <input type = "file" name = "select_file"/> I want to decompress that .zip file and read csv data. file_data = self.request.get('select_file') file_str = zlib.decompress(file_data) #file_data_list = file_str.split('\n') #file_Reader = csv.reader(file_data_list,quoting=csv.QUOTE_NONE ) I am expecting csv data in file_str but I am getting error. error :: Error -3 while decompressing data: incorrect header check What I have to use?

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  • How to wrap two unmannaged C++ functions into two managed C# functions?

    - by Gbps
    I've got two unmanaged C++ functions, Compress and Decompress. The arguments and returns go as followed: unsigned char* Compress (unsigned char*,int) unsigned char* Decompress (unsigned char*,int) Where all uchars are arrays of uchars. Could someone please help me lay out a way to convert these into managed C# code using the Byte[] array instead of unsigned char*? Thank you very much!

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  • In gzip libary, what's the difference between 'uncompress' and 'gzopen' ?

    - by Sol
    There are some functions to decompress in zlib library(zlib version 1.2.3) I want to decompress my source zip(.gz) file using 'uncompress' function. It is now working(error code -3) but gzopen is. It is still not working when I input payload pointer(passing gzip header) to 'uncompress' . So the question is "What's the valid arguments for uncompress function?" and If it needs different format, how can I make it? Google doesn't helpful this time :(

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  • Identify ENCRYPTED compressed files at the command line

    - by viking
    I have directories with hundreds of RAR files. Currently I use Powershell 2.0 with a script that utilizes WinRAR's RAR utility to decompress the files. The issue is that a small number of the files end up being encrypted, which pauses the script and requires interaction. Is there any way to do one of the following: Identify the encrypted files before trying to decompress Entirely ignore the encrypted files Automate an incorrect (or correct) password that will attempt to open the file, but just skip it if incorrect. NOTE: Some of the compressed files encrypt just file contents, whereas others encrypt file name and file contents. Relevent Code: $files = Get-ChildItem foreach($file in $files) { if($file.Attributes -eq "Archive") { $folder = $file.basename rar x $file $folder\ -y } }

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