Asked  7 Months ago    Answers:  5   Viewed   33 times
function uncompress($srcName, $dstName) {
    $sfp = gzopen($srcName, "rb");
    $fp = fopen($dstName, "w");

    while ($string = gzread($sfp, 4096)) {
        fwrite($fp, $string, strlen($string));

I tried this code but this does not work, I get:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.



Try this found here

//This input should be from somewhere else, hard-coded in this example
$file_name = '2013-07-16.dump.gz';

// Raising this value may increase performance
$buffer_size = 4096; // read 4kb at a time
$out_file_name = str_replace('.gz', '', $file_name); 

// Open our files (in binary mode)
$file = gzopen($file_name, 'rb');
$out_file = fopen($out_file_name, 'wb'); 

// Keep repeating until the end of the input file
while (!gzeof($file)) {
    // Read buffer-size bytes
    // Both fwrite and gzread and binary-safe
    fwrite($out_file, gzread($file, $buffer_size));

// Files are done, close files
Wednesday, March 31, 2021
answered 7 Months ago

To launch a program on the computer which runs the webserver:

exec('"C:Program Files (x86)Notepad++notepad++.exe" "C:foo.php"');

The above will work on vista/win7 IF the webserver does not run as a windows service. For example, if you run apache and it automatically starts when your computer boots, you probably installed it as a service. You can check to see if apache shows up in the windows services tab/thingy.

If the webserver runs as a service, you'll need to look into enabling the "allow desktop interaction" option for the service. But otherwise:

An easy test using php's new built in webserver(php 5.4+). The key thing here is you manually start the server from a shell, so it runs as your user instead of as a service.

// C:myhtdocsscript.php
exec('"C:Program Files (x86)Notepad++notepad++.exe" "C:foo.php"');

start a webserver via a command window

C:pathtophp.exe -S localhost:8000 -t C:myhtdocs

Then in your browser http://localhost:8000/script.php

Wednesday, March 31, 2021
answered 7 Months ago

Seems like you want something like this,

$txt = <<<EOT
??, ??
echo preg_replace('~[^p{L}p{N}n]+~u', '-', $txt);





  • p{L} Matches any kind of letter from any language.
  • p{N} matches any kind of numeric character in any script.
  • n Matches a newline character.
  • By putting all inside a negated character class will do the opposite operation.
Saturday, May 29, 2021
answered 5 Months ago

Compression streams don't flush (and can't properly flush) until they are closed. You will need to close the GZipStream. Telling it not to close the underlying stream (one of the constructor arguments) will make this easier.

        //generating data
        int length = 100000;
        byte[] data = new byte[length];
        for (int i = 0; i < length; i++)
            data[i] = System.Convert.ToByte(i % 100 + i % 50);

        byte[] o;
        //serialization into memory stream
        IFormatter formatter = new BinaryFormatter();
        using (var ms = new MemoryStream())
            formatter.Serialize(ms, data);
            ms.Seek(0, SeekOrigin.Begin);

            //GZip zip
            using(MemoryStream compressedStream = new MemoryStream())
                using (var Compress = new GZipStream(compressedStream, CompressionMode.Compress, true))
                compressedStream.Seek(0, SeekOrigin.Begin);
                //GZip Unzip
                using (MemoryStream uncompressedStream = new MemoryStream())
                    using (var Decompress = new GZipStream(compressedStream, CompressionMode.Decompress, true))
                    uncompressedStream.Seek(0, SeekOrigin.Begin);
                    var oo = formatter.Deserialize(uncompressedStream);
                    o = (byte[])oo;
            //deserialization from memory stream

        Debug.Assert(data.Length == o.Length);
        for (int i = 0; i < data.Length; i++)
            Debug.Assert(data[i] == o[i]);
Saturday, July 31, 2021
answered 3 Months ago

I get 42 bytes on .NET as well. I suspect you're using an old version of .NET which had a flaw in its compression scheme.

Here's my test app using your code:

using System;
using System.IO;
using System.IO.Compression;
using System.Text;

class Program
    static void Main(string[] args)
        var uncompressed = Encoding.UTF8.GetBytes("Mary had a little lamb");
        var compressed = GZIPCompress(uncompressed);

    static byte[] GZIPCompress(byte[] data)
        using (var memoryStream = new MemoryStream())
            using (var gZipStream = new GZipStream(memoryStream, 
                gZipStream.Write(data, 0, data.Length);

            return memoryStream.ToArray();



This is exactly the same as the Java data.

I'm using .NET 4.5. I suggest you try running the above code on your machine, and compare the results.

I've just decompressed the base64 data you provided, and it is a valid "compressed" form of "Mary had a little lamb", with 22 bytes in the uncompressed data. That surprises me... and reinforces my theory that it's a framework version difference.

EDIT: Okay, this is definitely a framework version difference. If I compile with the .NET 3.5 compiler, then use an app.config which forces it to run with that version of the framework, I see 137 bytes as well. Given comments, it looks like this was only fixed in .NET 4.5.

Wednesday, August 25, 2021
answered 2 Months ago
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