/// <summary> /// Unpacks a single file from an archive or archive chain. /// </summary> private void UnpackOneFile( IUnpackStreamContext streamContext, ZipFileHeader header, ref Stream archiveStream) { ZipFileInfo fileInfo = null; Stream fileStream = null; try { Converter <Stream, Stream> compressionStreamCreator; if (!ZipEngine.decompressionStreamCreators.TryGetValue( header.compressionMethod, out compressionStreamCreator)) { // Silently skip files of an unsupported compression method. return; } long compressedSize; long uncompressedSize; long localHeaderOffset; int archiveNumber; uint crc; header.GetZip64Fields( out compressedSize, out uncompressedSize, out localHeaderOffset, out archiveNumber, out crc); if (this.currentArchiveNumber != archiveNumber + 1) { if (archiveStream != null) { streamContext.CloseArchiveReadStream( this.currentArchiveNumber, String.Empty, archiveStream); archiveStream = null; this.OnProgress(ArchiveProgressType.FinishArchive); this.currentArchiveName = null; } this.currentArchiveNumber = (short)(archiveNumber + 1); this.currentArchiveBytesProcessed = 0; this.currentArchiveTotalBytes = 0; archiveStream = this.OpenArchive( streamContext, this.currentArchiveNumber); FileStream archiveFileStream = archiveStream as FileStream; this.currentArchiveName = (archiveFileStream != null ? Path.GetFileName(archiveFileStream.Name) : null); this.currentArchiveTotalBytes = archiveStream.Length; this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.StartArchive); this.currentArchiveNumber++; } archiveStream.Seek(localHeaderOffset, SeekOrigin.Begin); ZipFileHeader localHeader = new ZipFileHeader(); if (!localHeader.Read(archiveStream, false) || !ZipEngine.AreFilePathsEqual(localHeader.fileName, header.fileName)) { string msg = "Could not read file: " + header.fileName; throw new ZipException(msg); } fileInfo = header.ToZipFileInfo(); fileStream = streamContext.OpenFileWriteStream( fileInfo.FullName, fileInfo.Length, fileInfo.LastWriteTime); if (fileStream != null) { this.currentFileName = header.fileName; this.currentFileBytesProcessed = 0; this.currentFileTotalBytes = fileInfo.Length; this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.StartFile); this.currentArchiveNumber++; this.UnpackFileBytes( streamContext, fileInfo.FullName, fileInfo.CompressedLength, fileInfo.Length, header.crc32, fileStream, compressionStreamCreator, ref archiveStream); } } finally { if (fileStream != null) { streamContext.CloseFileWriteStream( fileInfo.FullName, fileStream, fileInfo.Attributes, fileInfo.LastWriteTime); this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.FinishFile); this.currentArchiveNumber++; } } }
/// <summary> /// Unpacks a single file from an archive or archive chain. /// </summary> private void UnpackOneFile( IUnpackStreamContext streamContext, ZipFileHeader header, ref Stream archiveStream) { ZipFileInfo fileInfo = null; Stream fileStream = null; try { Converter<Stream, Stream> compressionStreamCreator; if (!ZipEngine.decompressionStreamCreators.TryGetValue( header.compressionMethod, out compressionStreamCreator)) { // Silently skip files of an unsupported compression method. return; } long compressedSize; long uncompressedSize; long localHeaderOffset; int archiveNumber; uint crc; header.GetZip64Fields( out compressedSize, out uncompressedSize, out localHeaderOffset, out archiveNumber, out crc); if (this.currentArchiveNumber != archiveNumber + 1) { if (archiveStream != null) { streamContext.CloseArchiveReadStream( this.currentArchiveNumber, String.Empty, archiveStream); archiveStream = null; this.OnProgress(ArchiveProgressType.FinishArchive); this.currentArchiveName = null; } this.currentArchiveNumber = (short) (archiveNumber + 1); this.currentArchiveBytesProcessed = 0; this.currentArchiveTotalBytes = 0; archiveStream = this.OpenArchive( streamContext, this.currentArchiveNumber); FileStream archiveFileStream = archiveStream as FileStream; this.currentArchiveName = (archiveFileStream != null ? Path.GetFileName(archiveFileStream.Name) : null); this.currentArchiveTotalBytes = archiveStream.Length; this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.StartArchive); this.currentArchiveNumber++; } archiveStream.Seek(localHeaderOffset, SeekOrigin.Begin); ZipFileHeader localHeader = new ZipFileHeader(); if (!localHeader.Read(archiveStream, false) || !ZipEngine.AreFilePathsEqual(localHeader.fileName, header.fileName)) { string msg = "Could not read file: " + header.fileName; throw new ZipException(msg); } fileInfo = header.ToZipFileInfo(); fileStream = streamContext.OpenFileWriteStream( fileInfo.FullName, fileInfo.Length, fileInfo.LastWriteTime); if (fileStream != null) { this.currentFileName = header.fileName; this.currentFileBytesProcessed = 0; this.currentFileTotalBytes = fileInfo.Length; this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.StartFile); this.currentArchiveNumber++; this.UnpackFileBytes( streamContext, fileInfo.FullName, fileInfo.CompressedLength, fileInfo.Length, header.crc32, fileStream, compressionStreamCreator, ref archiveStream); } } finally { if (fileStream != null) { streamContext.CloseFileWriteStream( fileInfo.FullName, fileStream, fileInfo.Attributes, fileInfo.LastWriteTime); this.currentArchiveNumber--; this.OnProgress(ArchiveProgressType.FinishFile); this.currentArchiveNumber++; } } }