public ELFFile(File file)
{
theFile = file;
if (theFile == null)
{
Console.Default.ErrorColour();
Console.Default.Write("Error constructing ELF file! theFile is null");
BasicConsole.Write("Error constructing ELF file! theFile is null");
if (file == null)
{
Console.Default.Write(" and file is null");
BasicConsole.Write(" and file is null");
}
else
{
Console.Default.Write(" and file is NOT null");
BasicConsole.Write(" and file is NOT null");
}
Console.Default.WriteLine(".");
BasicConsole.WriteLine(".");
Console.Default.DefaultColour();
ExceptionMethods.Throw(new FOS_System.Exception("Error loading ELF file! Supplied file is null."));
}
theStream = new CachedFileStream(theFile.GetStream());
ReadHeader();
if (IsValidFile())
{
ReadSectionHeaders();
ReadSegmentHeaders();
}
}
public static Process LoadProcess_FromRawExe(File RawExeFile, bool UserMode)
{
// - Read in file contents
// - Map enough memory for the exe file contents
// - Copy the memory over
//bool reenable = Scheduler.Enabled;
//if (reenable)
//{
// Scheduler.Disable();
//}
//TODO - Handle case of EXE being bigger than 4KiB?
// - Would need to map contiguous (virtual) pages.
BasicConsole.WriteLine("Mapping free page for process...");
byte* destMemPtr = (byte*)Hardware.VirtMemManager.MapFreePage(
UserMode ? Hardware.VirtMem.VirtMemImpl.PageFlags.None : Hardware.VirtMem.VirtMemImpl.PageFlags.KernelOnly);
BasicConsole.WriteLine(((FOS_System.String)"Physical address = ") + (uint)Hardware.VirtMemManager.GetPhysicalAddress(destMemPtr));
BasicConsole.WriteLine(((FOS_System.String)"Virtual address = ") + (uint)destMemPtr);
// Add the page to the current processes memory layout
// So we can access the memory while we load the process.
// Otherwise we will hit a page fault as soon as we try copying the memory
// further down.
// Note: The page fault will only be hit on starting a second process because
// the scheduler doesn't change the context when only one process is running.
ProcessManager.CurrentProcess.TheMemoryLayout.AddDataPage(
(uint)Hardware.VirtMemManager.GetPhysicalAddress(destMemPtr),
(uint)destMemPtr);
// We could have been "scheduler interrupted" just after the map but just before the
// add data page...
ProcessManager.CurrentProcess.LoadMemLayout();
//BasicConsole.WriteLine("Reading file...");
int bytesRead = 0;
byte[] readBuffer = new byte[4096];
bytesRead = RawExeFile.GetStream().Read(readBuffer, 0, 4096);
//BasicConsole.WriteLine("Copying data...");
Utilities.MemoryUtils.MemCpy_32(destMemPtr, ((byte*)Utilities.ObjectUtilities.GetHandle(readBuffer)) + FOS_System.Array.FieldsBytesSize, (uint)bytesRead);
//BasicConsole.WriteLine("Converting destMemPtr...");
ThreadStartMethod mainMethod = (ThreadStartMethod)Utilities.ObjectUtilities.GetObject(destMemPtr);
//BasicConsole.WriteLine("Getting process name...");
FOS_System.String name = RawExeFile.Name;
// - Create the process
//BasicConsole.WriteLine("Creating process...");
Process process = ProcessManager.CreateProcess(
mainMethod, name, UserMode);
//BasicConsole.WriteLine("Adding process' code page...");
// Add code page to new processes memory layout
process.TheMemoryLayout.AddCodePage((uint)Hardware.VirtMemManager.GetPhysicalAddress(destMemPtr),
(uint)destMemPtr);
//BasicConsole.WriteLine("Removing process' code page from current process...");
//Remove from current processes memory layout
ProcessManager.CurrentProcess.TheMemoryLayout.RemovePage((uint)destMemPtr);
//if (reenable)
//{
// Scheduler.Enable();
//}
return process;
}
/// <summary>
/// Copies the specified file.
/// </summary>
/// <param name="srcFile">The file to copy.</param>
/// <param name="dst">The path to copy to.</param>
private void CopyFile(File srcFile, FOS_System.String dst)
{
//If source file is null, it means it wasn't found by the caller (or some
// other error but we will assume not found since that is the expected use
// case from the other overload of CopyFile).
if(srcFile == null)
{
console.WriteLine("Source file not found!");
return;
}
//Attempt to open the destination file.
File dstFile = File.Open(dst);
//If opening failed, the file was not found so either the path
// was invalid or the file does not currently exist. We assume
// the latter. If the path is invalid, it will be caught later.
if (dstFile == null)
{
//console.WriteLine("Creating destination file...");
//If the path is invalid because of path mapping, it will be
// caught here.
FileSystemMapping mapping = FileSystemManager.GetMapping(dst);
if (mapping == null)
{
console.WriteLine("Destination file system not found!");
return;
}
//+1 to include the slash in dir name
int lastIdx = dst.LastIndexOf(FileSystemManager.PathDelimiter) + 1;
FOS_System.String dstDir = dst.Substring(0, lastIdx);
FOS_System.String dstName = dst.Substring(lastIdx, dst.length - lastIdx);
//console.WriteLine("dstDir: " + dstDir);
//console.WriteLine("dstName: " + dstName);
//New directory either creates the directory, or returns the existing directory
Directory parentDir = NewDirectory(dstDir);
//If the parent dir is null, the path must be invalid so we cannot create the
// dest file.
if (parentDir != null)
{
dstFile = mapping.TheFileSystem.NewFile(dstName, parentDir);
}
//If we still failed to create the file, then the path was totally invalid
if (dstFile == null)
{
console.WriteLine("Failed to create destination file!");
return;
}
console.WriteLine("Destination file created.");
}
else
{
console.WriteLine("Destination file already exists.");
}
//Get full path resolves the path of the file without using short-hands
// such as ./ and .. which can be used in the arguments to this method.
// So, GetFullPath allows us to do a consistent comparison of the paths.
FOS_System.String srcFullPath = srcFile.GetFullPath();
FOS_System.String dstFullPath = dstFile.GetFullPath();
//If we are about to copy a file onto itself, well that wouldn't technically
// give us an issue given our copy implementation, but it is pretty pointless.
// Also, it would give a more sofisticated copy algorithm (e.g. block copying
// for large files) a big problem!
if (srcFullPath == dstFullPath)
{
console.WriteLine("Atempted to copy a file to itself! (" + srcFullPath + ")");
return;
}
else
{
console.WriteLine("Copying " + srcFullPath + " to " + dstFullPath);
}
//Get the streams to read from / write to
FOS_System.IO.Streams.FileStream srcStr = srcFile.GetStream();
FOS_System.IO.Streams.FileStream dstStr = dstFile.GetStream();
//Temporary storage. Note: If the file is to big, this will just fail
// as there won't be enough heap memory available
byte[] data = new byte[(uint)srcFile.TheFileSystem.ThePartition.BlockSize];
//Force stream positions
srcStr.Position = 0;
dstStr.Position = 0;
console.Write("[");
int percentile = (int)(uint)FOS_System.Math.Divide(srcFile.Size, 78u);
int dist = 0;
while ((ulong)srcStr.Position < srcFile.Size)
{
//Read in source data.
srcStr.Read(data, 0, data.Length);
//Write out data to destination.
dstStr.Write(data, 0, data.Length);
dist += data.Length;
if (dist >= percentile)
{
console.Write(".");
dist -= percentile;
}
}
console.WriteLine("]");
console.WriteLine("Copied successfully.");
}