Implement File compression and decompression code in asp.net

The article summarizes the implementation of File compression and decompression code in asp.net C #. For more information, see this article.

The Code is as follows:

Copy code

Using System; Using System. IO; Using ICSharpCode. SharpZipLib. Checksums; Using ICSharpCode. SharpZipLib. Zip; Using ICSharpCode. SharpZipLib. GZip;   Namespace ZipFile { /// <Summary> /// Compressed file /// </Summary> Public class ZipHelp { Public string ZipName {get; set ;} /// <Summary> /// Compressed folder /// </Summary> /// <Param name = "zipSourcePath"> path of the folder to be compressed (full path) </param> /// <Param name = "zipToFilePath"> the path saved after compression must contain a suffix such as: D: \ aa.zip (if it is null, it is saved to the same-level folder by default. The name is the source file name) </param> Public void ZipFileMain (string zipSourcePath, string zipToFilePath) { String [] filenames = Directory. GetFiles (zipSourcePath ); ZipName = zipSourcePath. Substring (zipSourcePath. LastIndexOf ("\") + 1 ); // Define the compressed directory object Crc32 crc = new Crc32 (); ZipOutputStream s = new ZipOutputStream (File. Create (zipToFilePath. Equals ("")? ZipSourcePath + ". zip": zipToFilePath ));   S. SetLevel (6); // sets the compression level // Recursively compress all files and word folders in the folder AddDirToDir (crc, s, zipSourcePath );   S. Finish (); S. Close (); } /// <Summary> /// Compress a single object /// </Summary> /// <Param name = "zipSourcePath"> path of the file to be compressed (full path) </param> /// <Param name = "zipToFilePath"> path of the compressed file (if it is a null character, the file name is the source file name by default compressed to the same directory) </param> Public void ZipByFile (string zipSourcePath, string zipToFilePath) { // Define the compressed directory object Crc32 crc = new Crc32 (); String dirName = zipSourcePath. substring (zipSourcePath. lastIndexOf ("\") + 1, zipSourcePath. lastIndexOf (". ")-(zipSourcePath. lastIndexOf ("\") + 1) + ". zip "; ZipOutputStream s = new ZipOutputStream (File. Create (zipToFilePath. Equals ("")? ZipSourcePath. Substring (0, zipSourcePath. LastIndexOf ("\") + "\" + dirName: zipToFilePath )); S. SetLevel (6); // sets the compression level AddFileToDir (crc, s, zipSourcePath, 0 ); S. Finish (); S. Close (); } /// <Summary> /// Compress a single file to a specified compressed folder (called internally) /// </Summary> /// <Param name = "crc"> </param> /// <Param name = "s"> </param> /// <Param name = "file"> file path </param> Public void AddFileToDir (Crc32 crc, ZipOutputStream s, string file, int dotype) { FileStream fs = File. OpenRead (file ); Byte [] buffer = new byte [fs. Length]; Fs. Read (buffer, 0, buffer. Length ); String filename = ""; If (dotype = 0) Filename = file. Substring (file. LastIndexOf ("\") + 1 ); Else Filename = file. Substring (file. IndexOf (ZipName )); ZipEntry entry = new ZipEntry (filename ); Entry. DateTime = DateTime. Now; Entry. Size = fs. Length; Fs. Close (); Crc. Reset (); Crc. Update (buffer ); Entry. Crc = crc. Value; S. PutNextEntry (entry ); S. Write (buffer, 0, buffer. Length ); } /// <Summary> /// Recursive Folder level (Internal call) /// </Summary> /// <Param name = "crc"> </param> /// <Param name = "s"> </param> /// <Param name = "file"> </param> Public void AddDirToDir (Crc32 crc, ZipOutputStream s, string file) { // Add files in this folder String [] files = Directory. GetFiles (file ); Foreach (string I in files) { AddFileToDir (crc, s, I, 1 ); } // Query subfolders in this folder String [] dirs = Directory. GetDirectories (file ); Foreach (string I in dirs) { AddDirToDir (crc, s, I ); } } } }

------------------------------------------- Next is the decompressed class ------------------------------------------------------

The Code is as follows:

Copy code

Using System; Using System. Text; Using System. Collections; Using System. IO; Using System. Diagnostics; Using System. Runtime. Serialization. Formatters. Binary; Using System. Data;   Using ICSharpCode. SharpZipLib. BZip2; Using ICSharpCode. SharpZipLib. Zip; Using ICSharpCode. SharpZipLib. Zip. Compression; Using ICSharpCode. SharpZipLib. Zip. Compression. Streams; Using ICSharpCode. SharpZipLib. GZip;   Namespace ZipFile { /// <Summary> /// Decompress the file /// </Summary> Public class UnZipFile { /// <Summary> /// Decompress the file /// </Summary> /// <Param name = "UnSourceZip"> source file </param> /// <Param name = "UnZipToPath"> extract the package to the directory path (if it is null, extract it to the current directory) </param> Public void UnZip (string UnSourceZip, string UnZipToPath) { ZipInputStream s = new ZipInputStream (File. OpenRead (UnSourceZip ));   ZipEntry theEntry; While (theEntry = s. GetNextEntry ())! = Null) {   String fileName = Path. GetFileName (theEntry. Name );   // Generate the extract directory If (! UnZipToPath. Equals ("")) Directory. CreateDirectory (UnZipToPath ); Else UnZipToPath = UnSourceZip. Substring (0, UnSourceZip. LastIndexOf ("\")> 0? UnSourceZip. LastIndexOf ("\"): 0 ); If (fileName! = String. Empty) { // Create a folder Int startIndex = 0; While (theEntry. Name. IndexOf ("/", startIndex)> 0) { // Calculate the folder path String dirpath = theEntry. Name. Substring (0, theEntry. Name. IndexOf ("/", startIndex )); // Add a folder Directory. CreateDirectory (UnZipToPath. Equals ("")? Dirpath: UnZipToPath + "//" + dirpath ); StartIndex = theEntry. Name. IndexOf ("/", startIndex) + 1; } // Extract the file to the specified directory FileStream streamWriter = File. Create (UnZipToPath. Equals ("")? TheEntry. Name: UnZipToPath + "//" + theEntry. Name ); Int size = 2048; Byte [] data = new byte [2048]; While (true) { Size = s. Read (data, 0, data. Length ); If (size> 0) { StreamWriter. Write (data, 0, size ); } Else { Break; } }   StreamWriter. Close (); } } S. Close (); } } }