How to unzip files in Windows Phone 8
Is it possible to unzip files on my application which is on Windows Phone 8? Most libs are using Windows Phone 7 but not Windows Phone 8.
Even System.IO.Compressio
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Put this code inside Unzipper class like this
public sealed class UnZipper : IDisposable { private Stream stream; private List<FileEntry> fileEntries; /// <summary> /// Class used for storing file entry information when /// parsing the central file directory. /// </summary> private class FileEntry { public string Filename; public int FileStart; public int CompressedSize; public int UncompressedSize; public int CRC32; } /// <summary> /// Initializes a new instance of the <see cref="UnZipper"/> class. /// </summary> /// <param name="zipFileStream">The zip file stream.</param> public UnZipper(Stream zipFileStream) { if (!zipFileStream.CanSeek) throw new NotSupportedException("zip stream must be seekable"); this.stream = zipFileStream; } /// <summary> /// Gets the file stream for the specified file. Returns null if the file could not be found. /// </summary> /// <param name="filename">The filename.</param> /// <returns>Stream to file inside zip stream</returns> public Stream GetFileStream(string filename) { if (fileEntries == null) fileEntries = ParseCentralDirectory(); //We need to do this in case the zip is in a format Silverligth doesn't like long position = this.stream.Position; this.stream.Seek(0, SeekOrigin.Begin); Uri fileUri = new Uri(filename, UriKind.Relative); StreamResourceInfo info = new StreamResourceInfo(this.stream, null); StreamResourceInfo stream = System.Windows.Application.GetResourceStream(info, fileUri); this.stream.Position = position; if (stream != null) return stream.Stream; return null; } /// <summary> /// Gets a list of file names embedded in the zip file. /// </summary> /// <param name="stream">The stream for a zip file.</param> /// <returns>List of file names</returns> public IEnumerable<string> FileNamesInZip() { //get //{ if (fileEntries == null) fileEntries = ParseCentralDirectory(); foreach (FileEntry entry in fileEntries) //Ignore folders and "hidden" MacOS folders if (!entry.Filename.EndsWith("/") && !entry.Filename.StartsWith("__MACOSX/")) yield return entry.Filename; //} } /// <summary> /// Gets a list of directories embedded in the zip file /// </summary> public IEnumerable<string> DirectoriesInZip { get { if (fileEntries == null) fileEntries = ParseCentralDirectory(); foreach (FileEntry entry in fileEntries) //Ignore files and special MacOS folders if (entry.Filename.EndsWith("/") && !entry.Filename.StartsWith("__MACOSX/")) yield return entry.Filename; } } private List<FileEntry> ParseCentralDirectory() { BinaryReader reader = new BinaryReader(this.stream); List<FileEntry> entries = new List<FileEntry>(); reader.BaseStream.Seek(-4, SeekOrigin.End); while (reader.ReadInt32() != 101010256) { reader.BaseStream.Seek(-5, SeekOrigin.Current); } reader.BaseStream.Seek(6, SeekOrigin.Current); short entryCount = reader.ReadInt16(); int directorySize = reader.ReadInt32(); int directoryStart = reader.ReadInt32(); reader.BaseStream.Seek(directoryStart, SeekOrigin.Begin); bool needsFixing = false; for (int i = 0; i < entryCount; i++) { int headerSignature = reader.ReadInt32(); if (headerSignature == 33639248) //Central directory file header signature { reader.BaseStream.Seek(4, SeekOrigin.Current); byte flag = reader.ReadByte(); if ((flag & 8) > 0) //Silverlight doesn't like this format. We'll "fix it" further below { needsFixing = true; } reader.BaseStream.Seek(7, SeekOrigin.Current); int crc32 = reader.ReadInt32(); int compressedSize = reader.ReadInt32(); int unCompressedSize = reader.ReadInt32(); short fileNameLenght = reader.ReadInt16(); short extraFieldLength = reader.ReadInt16(); short fileCommentLength = reader.ReadInt16(); reader.BaseStream.Seek(8, SeekOrigin.Current); int fileStart = reader.ReadInt32(); string filename = new string(reader.ReadChars(fileNameLenght)); entries.Add(new FileEntry() { Filename = filename, FileStart = fileStart, CRC32 = crc32, CompressedSize = compressedSize, UncompressedSize = unCompressedSize }); reader.BaseStream.Seek(extraFieldLength + fileCommentLength, SeekOrigin.Current); } } if (needsFixing) { //We are using a zipformat that Silverlight doesn't like. //Zipfiles where the file size is reported after the compressed data //is a no-go, so we rebuild the header and report the information there. MemoryStream newZip = new MemoryStream(); BinaryWriter writer = new BinaryWriter(newZip); //Rebuild file entries foreach (FileEntry entry in entries) { FileEntry e = entry; reader.BaseStream.Seek(entry.FileStart, SeekOrigin.Begin); e.FileStart = (int)writer.BaseStream.Position; CopyBytes(reader, writer, 6); byte flag = reader.ReadByte(); writer.Write((byte)(247 & flag)); //set 3rd bit to 0 to indicate the new format CopyBytes(reader, writer, 7); writer.Write(entry.CRC32); //Update CRC writer.Write(entry.CompressedSize); //Update Compressed size writer.Write(entry.UncompressedSize); //Update Uncompressed size writer.Write((short)entry.Filename.Length); reader.BaseStream.Seek(14, SeekOrigin.Current); short fieldLength = reader.ReadInt16(); writer.Write(fieldLength); CopyBytes(reader, writer, entry.Filename.Length + fieldLength + entry.CompressedSize); } //Rebuild directory reader.BaseStream.Seek(directoryStart, SeekOrigin.Begin); for (int i = 0; i < entryCount; i++) { CopyBytes(reader, writer, 8); byte flag = reader.ReadByte(); writer.Write((byte)(247 & flag)); //set 3rd bit to 0 to indicate the new format CopyBytes(reader, writer, 19); short filenamelength = reader.ReadInt16(); writer.Write(filenamelength); short extrafieldlength = reader.ReadInt16(); writer.Write(extrafieldlength); short filecommentlength = reader.ReadInt16(); writer.Write(filecommentlength); CopyBytes(reader, writer, 8); writer.Write(entries[i].FileStart); reader.BaseStream.Seek(4, SeekOrigin.Current); CopyBytes(reader, writer, filenamelength + extrafieldlength + filecommentlength); } CopyBytes(reader, writer, (int)(reader.BaseStream.Length - reader.BaseStream.Position)); this.stream = newZip; //Replace stream with new stream } return entries; } private static void CopyBytes(BinaryReader input, BinaryWriter output, int count) { for (int i = 0; i < count; i++) { output.Write(input.ReadByte()); } } #region IDisposable Members /// <summary> /// Performs application-defined tasks associated with freeing, releasing, /// or resetting unmanaged resources. /// </summary> public void Dispose() { if (stream != null) stream.Dispose(); } #endregion }and use this code where you want to unzip your file:
IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication(); using (IsolatedStorageFileStream fileStream = myIsolatedStorage.OpenFile(yourFileName, FileMode.Open, FileAccess.ReadWrite)) { UnZipper unzip = new UnZipper(fileStream); foreach (string filename in unzip.FileNamesInZip()) { string FileName = filename; } }讨论(0)
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