private void LoadStreams()
{
using (var stg = new OleStorageFile(new LessIO.Path(SelectedMsiFile.FullName)))
{
var streamViews = stg.GetStreams().Select(s => StreamInfoView.FromStream(s));
View.SetStreamSelectorSource(streamViews);
}
}
/// <summary>
/// Called by the view to notify of a change in the selection of the SelectedStreamInfo.
/// </summary>
public void OnSelectedStreamChanged()
{
if (View.SelectedStreamInfo != null && this.SelectedMsiFile != null)
{
// 1: find the right stream containing the cab bits:
using (var oleFile = new OleStorageFile(new LessIO.Path(this.SelectedMsiFile.FullName)))
{
var foundStream = oleFile.GetStreams().FirstOrDefault(s => string.Equals(View.SelectedStreamInfo.Name, s.Name, StringComparison.InvariantCulture));
if (foundStream == null)
{
View.ShowUserError("Could not find stream for CAB '{0}'", View.SelectedStreamInfo.Name);
return;
}
// if the file is a cab, we'll list the files in it (if it isn't clear the view):
IEnumerable <CabContainedFileView> streamFiles = new CabContainedFileView[] {};
if (View.SelectedStreamInfo.IsCabStream)
{
var tempFileName = System.IO.Path.GetTempFileName();
using (var cabBits = foundStream.GetStream(FileMode.Open, FileAccess.Read))
using (var writer = new BinaryWriter(File.Create(tempFileName)))
{
var buffer = new byte[1024 * 1024];
int bytesRead;
do
{
bytesRead = cabBits.Read(buffer, 0, buffer.Length);
writer.Write(buffer, 0, bytesRead);
} while (bytesRead > 0);
}
// 2: enumerate files in the cab and set them to the view's
using (var cab = new LibMSPackN.MSCabinet(tempFileName))
{
// ToList to force it to enumerate now.
streamFiles = cab.GetFiles().Select(f => new CabContainedFileView(f.Filename)).ToList();
}
Debug.Assert(streamFiles != null && streamFiles.Any());
}
View.SetCabContainedFileListSource(streamFiles);
}
}
}
public static void ExtractCabFromPackage(Path destCabPath, string cabName, Database inputDatabase, LessIO.Path msiPath)
{
//NOTE: checking inputDatabase.TableExists("_Streams") here is not accurate. It reports that it doesn't exist at times when it is perfectly queryable. So we actually try it and look for a specific exception:
//NOTE: we do want to tryStreams. It is more reliable when available and AFAICT it always /should/ be there according to the docs but isn't.
const bool tryStreams = true;
if (tryStreams)
{
try
{
ExtractCabFromPackageTraditionalWay(destCabPath, cabName, inputDatabase);
// as long as TraditionalWay didn't throw, we'll leave it at that...
return;
}
catch (Exception e)
{
Debug.WriteLine("ExtractCabFromPackageTraditionalWay Exception: {0}", e);
// According to issue #78 (https://github.com/activescott/lessmsi/issues/78), WIX installers sometimes (always?)
// don't have _Streams table yet they still install. Since it appears that msi files generally (BUT NOT ALWAYS - see X86 Debuggers And Tools-x86_en-us.msi) will have only one cab file, we'll try to just find it in the sterams and use it instead:
Trace.WriteLine("MSI File has no _Streams table. Attempting alternate cab file extraction process...");
}
}
using (var stg = new OleStorageFile(msiPath))
{
// MSIs do exist with >1. If we use the ExtractCabFromPackageTraditionalWay (via _Streams table) then it handles that. If we are using this fallback approach, multiple cabs is a bad sign!
Debug.Assert(CountCabs(stg) == 1, string.Format("Expected 1 cab, but found {0}.", CountCabs(stg)));
foreach (var strm in stg.GetStreams())
{
using (var bits = strm.GetStream(FileMode.Open, FileAccess.Read))
{
if (OleStorageFile.IsCabStream(bits))
{
Trace.WriteLine(String.Format("Found CAB bits in stream. Assuming it is for cab {0}.", destCabPath));
Func <byte[], int> streamReader = destBuffer => bits.Read(destBuffer, 0, destBuffer.Length);
CopyStreamToFile(streamReader, destCabPath);
}
}
}
}
}
private static int CountCabs(OleStorageFile stg)
{
return(stg.GetStreams().Count(strm => OleStorageFile.IsCabStream((StreamInfo)strm)));
}