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317 lines
12 KiB
C#
317 lines
12 KiB
C#
/* Copyright (c) Citrix Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.IO;
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using XenCenterLib.Compression;
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using XenOvf.Definitions;
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namespace XenOvf
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{
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public class OvfCompressor
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{
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private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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/// <summary>
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/// Set to TRUE to Cancel current Compression process.
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/// </summary>
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public bool CancelCompression { get; set; }
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/// <summary>
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/// Check the Envelope to see if the files are compressed.
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/// </summary>
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/// <param name="ovfFilename">fullpath/filename to OVF</param>
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/// <param name="method">out method used: Gzip | BZip2</param>
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/// <returns>True|False</returns>
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public bool IsCompressed(string ovfFilename, out string method)
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{
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EnvelopeType env = OVF.Load(ovfFilename);
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return IsCompressed(env, out method);
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}
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/// <summary>
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/// Check the Envelope to see if the files are compressed.
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/// </summary>
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/// <param name="env">EnvelopeType</param>
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/// <param name="method">out method used: Gzip | BZip2</param>
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/// <returns>True|False</returns>
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public bool IsCompressed(EnvelopeType env, out string method)
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{
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if (env.References != null && env.References.File != null && env.References.File.Length > 0)
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{
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foreach (File_Type file in env.References.File)
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{
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if (!string.IsNullOrEmpty(file.compression))
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{
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method = file.compression;
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return true;
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}
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}
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}
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method = "none";
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return false;
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}
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/// <summary>
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/// Open the OVF file and compress the uncompressed files.
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/// </summary>
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/// <param name="ovfFilename">pull path and filename.</param>
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/// <param name="method">GZip | BZip2</param>
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public void CompressOvfFiles(string ovfFilename, string method)
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{
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CompressOvfFiles(OVF.Load(ovfFilename), ovfFilename, method, true);
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="env"></param>
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/// <param name="ovfilename"></param>
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/// <param name="method"></param>
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/// <param name="compress"></param>
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public void CompressOvfFiles(EnvelopeType env, string ovfilename, string method, bool compress)
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{
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ProcessCompression(env, Path.GetDirectoryName(ovfilename), method, compress);
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OVF.SaveAs(env, ovfilename);
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}
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/// <summary>
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/// Open the OVF file and uncompress the compressed files.
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/// </summary>
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/// <param name="ovfFilename">pull path and filename.</param>
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public void UncompressOvfFiles(string ovfFilename)
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{
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EnvelopeType env = OVF.Load(ovfFilename);
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ProcessCompression(env, Path.GetDirectoryName(ovfFilename), null, false);
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OVF.SaveAs(env, ovfFilename);
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}
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/// <summary>
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/// Uncompress a stream
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/// </summary>
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/// <param name="inputstream">compressed stream</param>
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/// <param name="method">GZip or Bzip2</param>
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/// <returns>uncompressed stream</returns>
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public CompressionStream UncompressFileStream(Stream inputstream, string method)
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{
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switch (method.ToLower())
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{
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case "gzip":
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return CompressionFactory.Reader(CompressionFactory.Type.Gz, inputstream);
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case "bzip2":
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return CompressionFactory.Reader(CompressionFactory.Type.Bz2, inputstream);
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}
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throw new InvalidDataException(string.Format(Messages.COMPRESS_INVALID_METHOD, method));
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}
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/// <summary>
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/// Compress a Stream
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/// </summary>
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/// <param name="inputstream">Source Input</param>
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/// <param name="method">GZip or BZip2</param>
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/// <returns>compressed stream</returns>
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public CompressionStream CompressFileStream(Stream inputstream, string method)
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{
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switch (method.ToLower())
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{
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case "gzip":
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return CompressionFactory.Writer(CompressionFactory.Type.Gz, inputstream);
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case "bzip2":
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return CompressionFactory.Writer(CompressionFactory.Type.Bz2, inputstream);
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}
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throw new InvalidDataException(string.Format(Messages.COMPRESS_INVALID_METHOD, method));
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="inputfile"></param>
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/// <param name="outputfile"></param>
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/// <param name="method"></param>
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public void UncompressFile(string inputfile, string outputfile, string method)
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{
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if (method.ToLower() == "gzip")
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{
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Stream InStream = File.Open(inputfile, FileMode.Open, FileAccess.ReadWrite, FileShare.None);
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Stream OutStream = File.Open(outputfile, FileMode.Create, FileAccess.ReadWrite, FileShare.None);
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try
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{
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GZipDecompress(InStream, OutStream);
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}
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catch (Exception ex)
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{
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if (ex is OperationCanceledException)
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throw;
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log.Warn("Ignoring uncompression issue: ", ex);
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}
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finally
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{
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InStream.Dispose();
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OutStream.Flush();
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OutStream.Dispose();
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}
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}
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else
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{
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throw new InvalidDataException(string.Format(Messages.COMPRESS_INVALID_METHOD, method));
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}
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}
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#region PRIVATE
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private void ProcessCompression(EnvelopeType env, string path, string method, bool compress)
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{
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if (env.References != null && env.References.File != null && env.References.File.Length > 0)
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{
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foreach (File_Type file in env.References.File)
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{
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if (compress)
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{
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if (method.ToLower() != "gzip" && method.ToLower() != "bzip2")
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throw new InvalidDataException(string.Format(Messages.COMPRESS_INVALID_METHOD, method));
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}
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else
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{
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if (file.compression == null)
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{
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log.InfoFormat("File {0} was not marked as compressed, skipped.", file.href);
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continue;
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}
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if (file.compression.ToLower() != "gzip" && file.compression.ToLower() != "bzip2")
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{
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log.ErrorFormat("Invalid compression method File: {0} Method: {1}, must be Gzip or BZip2", file.href, file.compression);
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continue;
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}
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method = file.compression;
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}
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int slash = file.href.LastIndexOf('/');
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string filename = slash >= 0 ? file.href.Substring(slash + 1) : file.href;
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filename = Path.Combine(path, filename);
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string tempfile = Path.Combine(path, Path.GetFileName(Path.GetTempFileName()));
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try
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{
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if (method.ToLower() == "gzip")
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{
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using(var inputFile = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
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{
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using (var outputFile = new FileStream(tempfile, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None))
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{
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if (compress)
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GZipCompress(inputFile, outputFile);
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else
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GZipDecompress(inputFile, outputFile);
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}
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inputFile.Flush();
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}
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//the original file should be overwritten only if the process has succeeded, so it should
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//be done here and not in the finally block, because if compression/decompression fails
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//for some reason, the original file is lost
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File.Delete(filename);
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File.Move(tempfile, filename);
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}
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else
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{
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throw new InvalidDataException(string.Format(Messages.COMPRESS_INVALID_METHOD, method));
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}
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file.compression = compress ? method : null;
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}
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catch (EndOfStreamException eose)
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{
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log.Error("End of Stream: ", eose);
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}
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catch (Exception ex)
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{
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if (ex is OperationCanceledException)
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throw;
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log.Error("Compression failure", ex);
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throw new Exception(string.Format(Messages.COMPRESS_FAILED, filename), ex);
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}
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finally
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{
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//in case of failure or cancellation delete the temp file;
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//in case of success it won't be there, but no exception is thrown
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File.Delete(tempfile);
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}
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FileInfo fi = new FileInfo(filename);
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file.size = (ulong)fi.Length;
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}
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}
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}
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private void GZipCompress(Stream inputStream, Stream outputStream)
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{
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if (inputStream == null || outputStream == null) { throw new ArgumentNullException(); }
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CompressionStream bzos = CompressionFactory.Writer(CompressionFactory.Type.Gz, outputStream);
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StreamCopy(inputStream, (CompressionStream)bzos);
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bzos.Dispose();
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}
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private void GZipDecompress(Stream inputStream, Stream outputStream)
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{
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if (inputStream == null || outputStream == null) { throw new ArgumentNullException(); }
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CompressionStream bzis = CompressionFactory.Reader(CompressionFactory.Type.Gz, inputStream);
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StreamCopy((CompressionStream)bzis, outputStream);
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outputStream.Flush();
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bzis.Dispose();
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}
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/// <summary>
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/// This code is similar to the one in XenOvf.Utilities.Tool.StreamCopy.
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/// It's duplicated (almost duplicated, I removed the block clearing to improve performance) as part
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/// of the fix to CA-54859 in order to avoid too large scale changes at a late stage of development.
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/// </summary>
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private void StreamCopy(Stream Input, Stream Output)
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{
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int bufsize = 2 * MB;
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byte[] block = new byte[bufsize];
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while (true)
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{
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int n = Input.Read(block, 0, block.Length);
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if (n <= 0)
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break;
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Output.Write(block, 0, n);
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if (CancelCompression)
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throw new OperationCanceledException();
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}
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Output.Flush();
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}
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private const int KB = 1024;
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private const int MB = (KB * 1024);
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#endregion
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}
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} |