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using MediaBrowser.Common.IO;
using MediaBrowser.Common.Kernel;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.IsoMounter
{
/// <summary>
/// Class IsoManager
/// </summary>
public class IsoManager : BaseManager<IKernel>, IIsoManager
{
/// <summary>
/// The mount semaphore - limit to four at a time.
/// </summary>
private readonly SemaphoreSlim _mountSemaphore = new SemaphoreSlim(4,4);
/// <summary>
/// The PFM API
/// </summary>
private PfmApi _pfmApi;
/// <summary>
/// The _PFM API initialized
/// </summary>
private bool _pfmApiInitialized;
/// <summary>
/// The _PFM API sync lock
/// </summary>
private object _pfmApiSyncLock = new object();
/// <summary>
/// Gets the display prefs.
/// </summary>
/// <value>The display prefs.</value>
private PfmApi PfmApi
{
get
{
LazyInitializer.EnsureInitialized(ref _pfmApi, ref _pfmApiInitialized, ref _pfmApiSyncLock, () =>
{
var err = PfmStatic.InstallCheck();
if (err != PfmInst.installed)
{
throw new Exception("Pismo File Mount Audit Package is not installed");
}
PfmApi pfmApi;
err = PfmStatic.ApiFactory(out pfmApi);
if (err != 0)
{
throw new IOException("Unable to open PFM Api. Pismo File Mount Audit Package is probably not installed.");
}
return pfmApi;
});
return _pfmApi;
}
}
/// <summary>
/// The _has initialized
/// </summary>
private bool _hasInitialized;
/// <summary>
/// Initializes a new instance of the <see cref="IsoManager" /> class.
/// </summary>
/// <param name="kernel">The kernel.</param>
public IsoManager(IKernel kernel)
: base(kernel)
{
}
/// <summary>
/// The _my PFM file mount UI
/// </summary>
private readonly MyPfmFileMountUi _myPfmFileMountUi = new MyPfmFileMountUi();
/// <summary>
/// Mounts the specified iso path.
/// </summary>
/// <param name="isoPath">The iso path.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="visibleToAllProcesses">if set to <c>true</c> [visible to all processes].</param>
/// <returns>IsoMount.</returns>
/// <exception cref="System.ArgumentNullException">isoPath</exception>
/// <exception cref="System.IO.IOException">Unable to create mount.</exception>
public async Task<IIsoMount> Mount(string isoPath, CancellationToken cancellationToken, bool visibleToAllProcesses = true)
{
if (string.IsNullOrEmpty(isoPath))
{
throw new ArgumentNullException("isoPath");
}
PfmFileMount mount;
var err = PfmApi.FileMountCreate(out mount);
if (err != 0)
{
throw new IOException("Unable to create mount for " + isoPath);
}
_hasInitialized = true;
var fmp = new PfmFileMountCreateParams { };
fmp.ui = _myPfmFileMountUi;
fmp.fileMountFlags |= PfmFileMountFlag.inProcess;
if (visibleToAllProcesses)
{
fmp.visibleProcessId = PfmVisibleProcessId.all;
}
fmp.mountFileName = isoPath;
// unc only
fmp.mountFlags |= PfmMountFlag.uncOnly;
fmp.mountFlags |= PfmMountFlag.noShellNotify;
fmp.mountFlags |= PfmMountFlag.readOnly;
Logger.Info("Mounting {0}", isoPath);
await _mountSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
err = mount.Start(fmp);
if (err != 0)
{
_mountSemaphore.Release();
mount.Dispose();
throw new IOException("Unable to start mount for " + isoPath);
}
err = mount.WaitReady();
if (err != 0)
{
_mountSemaphore.Release();
mount.Dispose();
throw new IOException("Unable to start mount for " + isoPath);
}
return new IsoMount(mount, isoPath, this);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected override void Dispose(bool dispose)
{
if (dispose)
{
if (_hasInitialized)
{
Logger.Info("Disposing PfmPapi");
_pfmApi.Dispose();
Logger.Info("PfmStatic.ApiUnload");
PfmStatic.ApiUnload();
}
}
base.Dispose(dispose);
}
/// <summary>
/// Gets a value indicating whether this instance can mount.
/// </summary>
/// <param name="path">The path.</param>
/// <returns><c>true</c> if this instance can mount the specified path; otherwise, <c>false</c>.</returns>
/// <value><c>true</c> if this instance can mount; otherwise, <c>false</c>.</value>
public bool CanMount(string path)
{
try
{
return string.Equals(Path.GetExtension(path), ".iso", StringComparison.OrdinalIgnoreCase) && PfmApi != null;
}
catch
{
return false;
}
}
/// <summary>
/// Called when [unmount].
/// </summary>
/// <param name="mount">The mount.</param>
internal void OnUnmount(IsoMount mount)
{
_mountSemaphore.Release();
}
}
}
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