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POcompression string in c#
 

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  1. POcompression string in c#
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    <p>I am using the following code to compress 2 strings, it works well in compression. However, when I try to decompress the second strings and if the first one is short (about 4 characters) I got Block length does not match with its complement exception. Here is the class I used for compression:</p> <pre><code> using System; using System.IO; using System.IO.Compression; using System.Text; namespace CompressString { internal static class StringCompressor { /// &lt;summary&gt; /// Compresses the string. /// &lt;/summary&gt; /// &lt;param name="text"&gt;The text.&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static string CompressString(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(); } /// &lt;summary&gt; /// Decompresses the string. /// &lt;/summary&gt; /// &lt;param name="compressedText"&gt;The compressed text.&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static string DecompressString(string sData) { byte[] byteArray = new byte[sData.Length]; int indexBa = 0; foreach (char item in sData) byteArray[indexBa++] = (byte)item; MemoryStream memoryStream = new MemoryStream(byteArray); GZipStream gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress); byteArray = new byte[1024]; StringBuilder stringBuilder = new StringBuilder(); int readBytes; while ((readBytes = gZipStream.Read(byteArray, 0, byteArray.Length)) != 0) { for (int i = 0; i &lt; readBytes; i++) stringBuilder.Append((char)byteArray[i]); } gZipStream.Close(); memoryStream.Close(); gZipStream.Dispose(); memoryStream.Dispose(); return stringBuilder.ToString(); } } </code></pre> <p>}</p> <p>I got the exception in DecompressString method in the line:</p> <pre><code>while ((readBytes = gZipStream.Read(byteArray, 0, byteArray.Length)) != 0) </code></pre>
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    1. USuser1477701
    1. USuser1477701
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      1. POcompression string in c#
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      1. VTUpMod
    1. COThe built-in deflation algorithm of .NET is flaky and not recommended in any case - I'm not sure it's even been improves in more recent versions (can anyone clarify?) I'd say use SharpZipLib or something similar, just for starters.
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      1. USGrant Thomas
    2. COWhat do you mean by that Grant? sorry but I am novice in compression algorithms.. Will SharpZipLib solve my problem?
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      1. USuser1477701
    3. COI've used the .NET built-in compression algorithms with great success. At the core, they are useful for compressing/decompressing data that you control directly.
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      1. USdblood
 

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