internal static MemoryMappedDataReaderFactory CreateUnix(string filename, bool mapAsImage)
{
if (!canTryUnix)
{
return(null);
}
var creator = new MemoryMappedDataReaderFactory(GetFullPath(filename));
try {
Unix.Mmap(creator, mapAsImage);
if (mapAsImage) // Only check this if we know that mmap() works, i.e., if above call succeeds
{
creator.Dispose();
throw new ArgumentException("mapAsImage == true is not supported on this OS");
}
return(creator);
}
catch (MemoryMappedIONotSupportedException ex) {
Debug.WriteLine($"mmap'd IO didn't work: {ex.Message}");
}
catch (EntryPointNotFoundException) {
}
catch (DllNotFoundException) {
}
canTryUnix = false;
return(null);
}
/// <summary>
/// Creates a new <see cref="MemoryMappedFileStreamCreator"/> if supported or returns
/// <c>null</c> if the OS functions aren't supported.
/// </summary>
/// <remarks>If <paramref name="mapAsImage"/> is <c>true</c>, then the created
/// <see cref="UnmanagedMemoryStreamCreator"/> that is used internally by the class,
/// can only access bytes up to the file size, not to the end of the mapped image. You must
/// set <see cref="UnmanagedMemoryStreamCreator.Length"/> to the correct image length to access the full image.</remarks>
/// <param name="fileName">Name of the file</param>
/// <param name="mapAsImage">NOT SUPPORTED. <c>true</c> if we should map it as an executable</param>
/// <exception cref="IOException">If we can't open/map the file</exception>
internal static MemoryMappedFileStreamCreator CreateUnix(string fileName, bool mapAsImage)
{
if (!canTryUnix)
{
return(null);
}
var creator = new MemoryMappedFileStreamCreator();
creator.theFileName = GetFullPath(fileName);
try {
Unix.Mmap(creator, mapAsImage);
if (mapAsImage) // Only check this if we know that mmap() works, i.e., if above call succeeds
{
creator.Dispose();
throw new ArgumentException("mapAsImage == true is not supported on this OS");
}
return(creator);
}
catch (MemoryMappedIONotSupportedException ex) {
Debug.WriteLine(string.Format("mmap'd IO didn't work: {0}", ex.Message));
//TODO: The lseek() and mmap() fails on MacOS.
}
catch (EntryPointNotFoundException) {
}
catch (DllNotFoundException) {
}
canTryUnix = false;
return(null);
}
/// <summary>
/// Creates a new <see cref="MemoryMappedFileStreamCreator"/> if supported or returns
/// <c>null</c> if the OS functions aren't supported.
/// </summary>
/// <remarks>If <paramref name="mapAsImage"/> is <c>true</c>, then the created
/// <see cref="UnmanagedMemoryStreamCreator"/> that is used internally by the class,
/// can only access bytes up to the file size, not to the end of the mapped image. You must
/// set <see cref="UnmanagedMemoryStreamCreator.Length"/> to the correct image length to access the full image.</remarks>
/// <param name="fileName">Name of the file</param>
/// <param name="mapAsImage">NOT SUPPORTED. <c>true</c> if we should map it as an executable</param>
/// <exception cref="IOException">If we can't open/map the file</exception>
internal static MemoryMappedFileStreamCreator CreateUnix(string fileName, bool mapAsImage)
{
if (!canTryUnix)
{
return(null);
}
var creator = new MemoryMappedFileStreamCreator();
creator.theFileName = GetFullPath(fileName);
try {
Unix.Mmap(creator, mapAsImage);
if (mapAsImage) // Only check this if we know that mmap() works, i.e., if above call succeeds
{
creator.Dispose();
throw new ArgumentException("mapAsImage == true is not supported on this OS");
}
return(creator);
}
catch (EntryPointNotFoundException) {
}
catch (DllNotFoundException) {
}
canTryUnix = false;
return(null);
}
