private void ImportLocalDirectory(List <LocalDirectoryContentInfo> localDirectoryContentInfos, DirectoryInfo directoryInfo, int parentDirectoryCluster)
{
int newDirectoryClusterIndex = AddNextFreeClusterToChain();
_clusterInfos[newDirectoryClusterIndex] = new ClusterInfo()
{
FileOffset = -1,
DataBuffer = new byte[Parameters.BytesPerCluster]
};
FatAddDirectoryEntry(localDirectoryContentInfos,
parentDirectoryCluster,
newDirectoryClusterIndex,
directoryInfo.Parent.FullName,
directoryInfo.Name,
FAT16Helper.GetShortFileName(directoryInfo.Name),
FAT16Helper.DirectoryIdentifier,
directoryInfo.LastWriteTime,
0);
FatAddDirectoryEntry(localDirectoryContentInfos, newDirectoryClusterIndex, newDirectoryClusterIndex, directoryInfo.FullName, ".", ".", FAT16Helper.DirectoryIdentifier, directoryInfo.LastWriteTime, 0);
FatAddDirectoryEntry(localDirectoryContentInfos, newDirectoryClusterIndex, parentDirectoryCluster, directoryInfo.Parent.FullName, "..", "..", FAT16Helper.DirectoryIdentifier, directoryInfo.LastWriteTime, 0);
ImportLocalDiskContent(localDirectoryContentInfos, directoryInfo.FullName, newDirectoryClusterIndex);
}
private void ImportLocalFile(List <LocalDirectoryContentInfo> localDirectoryContentInfos, FileInfo fileInfo, int directoryClusterIndex)
{
long fileOffset = 0;
int fileentryStartClusterIndex = 0;
int? nextFileClusterIndex = null;
while (fileOffset < fileInfo.Length)
{
try
{
nextFileClusterIndex = AddNextFreeClusterToChain(nextFileClusterIndex);
if (fileentryStartClusterIndex == _rootDirectoryClusterIndex)
{
fileentryStartClusterIndex = nextFileClusterIndex.Value;
}
_clusterInfos[nextFileClusterIndex.Value] = new ClusterInfo()
{
FileOffset = fileOffset
};
fileOffset += Parameters.BytesPerCluster;
}
catch (IndexOutOfRangeException outOfRangeEx)
{
int localDirectorySizeMiB = (int)Directory.GetFiles(Parameters.LocalDirectoryPath, "*", SearchOption.AllDirectories).Sum(file => (new FileInfo(file).Length)) / FAT16Helper.BytesPerMiB;
_logger.LogException(outOfRangeEx, $"Local directory size is {localDirectorySizeMiB} MiB, which is too large for the given virtual disk size ({Parameters.DiskTotalBytes / FAT16Helper.BytesPerMiB} MiB)");
throw;
}
}
// handle duplicate short filenames
string TOSFileName = FAT16Helper.GetShortFileName(fileInfo.Name);
int duplicateId = 1;
while (localDirectoryContentInfos.Where(ldi => ldi.TOSFileName.Equals(TOSFileName, StringComparison.InvariantCultureIgnoreCase) &&
ldi.DirectoryCluster == directoryClusterIndex).Any())
{
int numberStringLength = duplicateId.ToString().Length + 1; // +1 for ~
int replaceIndex = TOSFileName.LastIndexOf('.') != -1 ? TOSFileName.LastIndexOf('.') : TOSFileName.Length;
replaceIndex -= numberStringLength;
TOSFileName = TOSFileName.Remove(replaceIndex, numberStringLength).Insert(replaceIndex, $"~{duplicateId}");
duplicateId++;
}
FatAddDirectoryEntry(localDirectoryContentInfos, directoryClusterIndex, fileentryStartClusterIndex,
fileInfo.DirectoryName, fileInfo.Name, TOSFileName, 0x00, fileInfo.LastWriteTime, fileInfo.Length);
}
public Disk(DiskParameters diskParams, ILogger logger)
{
_logger = logger;
Parameters = diskParams;
_rootDirectoryClusterIndex = 0;
try
{
InitDiskContentVariables();
int maxRootDirectoryEntries = ((diskParams.RootDirectorySectors * diskParams.BytesPerSector) / 32) - 2; // Each entry is 32 bytes, 2 entries reserved for . and ..
FAT16Helper.ValidateLocalDirectory(diskParams.LocalDirectoryPath, diskParams.DiskTotalBytes, maxRootDirectoryEntries, diskParams.SectorsPerCluster, diskParams.TOS);
}
catch (Exception ex)
{
_logger.LogException(ex, ex.Message);
throw;
}
ImportLocalDiskContent(_localDirectoryContentInfos, Parameters.LocalDirectoryPath, _rootDirectoryClusterIndex);
}
private bool FatAddDirectoryEntry(List <LocalDirectoryContentInfo> localDirectoryContentInfos,
int directoryClusterIndex, int entryStartClusterIndex,
string directoryPath, string fileName, string TOSFileName,
byte attributeFlags, DateTime lastWriteDateTime, long fileSize)
{
byte[] directoryBuffer;
int entryIndex = 0;
int maxEntryIndex = directoryClusterIndex == _rootDirectoryClusterIndex ? _rootDirectoryBuffer.Length : Parameters.BytesPerCluster;
if (directoryClusterIndex == _rootDirectoryClusterIndex)
{
directoryBuffer = _rootDirectoryBuffer;
}
else
{
directoryBuffer = _clusterInfos[directoryClusterIndex].DataBuffer;
}
// Check whether there is any space left in the cluster
do
{
// No space left
if (entryIndex >= maxEntryIndex)
{
int nextDirectoryClusterIndex = FatGetClusterValue(directoryClusterIndex);
// This is the final cluster, allocate new cluster
if (FAT16Helper.IsEndOfFile(nextDirectoryClusterIndex))
{
try
{
int newDirectoryCluster = AddNextFreeClusterToChain(directoryClusterIndex);
_clusterInfos[newDirectoryCluster] = new ClusterInfo()
{
FileOffset = -1,
DataBuffer = new byte[Parameters.BytesPerCluster]
};
_clusterInfos[newDirectoryCluster].LocalDirectoryContent = _clusterInfos[directoryClusterIndex].LocalDirectoryContent;
entryIndex = 0;
}
catch (IndexOutOfRangeException outOfRangeEx)
{
int localDirectorySizeMiB = (int)Directory.GetFiles(Parameters.LocalDirectoryPath, "*", SearchOption.AllDirectories).Sum(file => (new FileInfo(file).Length)) / FAT16Helper.BytesPerMiB;
_logger.LogException(outOfRangeEx, $"Local directory size is {localDirectorySizeMiB} MiB, which is too large for the given virtual disk size ({Parameters.DiskTotalBytes / FAT16Helper.BytesPerMiB} MiB)");
throw;
}
}
else
{
directoryClusterIndex = nextDirectoryClusterIndex;
}
directoryBuffer = _clusterInfos[directoryClusterIndex].DataBuffer;
entryIndex = 0;
}
// Find next unused entry in directory
while (entryIndex < maxEntryIndex && directoryBuffer[entryIndex] != 0)
{
entryIndex += 32;
}
if (entryIndex >= maxEntryIndex)
{
if (directoryClusterIndex == _rootDirectoryClusterIndex)
{
Exception outofIndexesException = new Exception($"Exceeded available directory entries in {directoryPath}. There may be too many files in directory (max {(maxEntryIndex / 32) - 2} items).");
_logger.LogException(outofIndexesException, outofIndexesException.Message);
throw outofIndexesException;
}
}
} while (entryIndex >= maxEntryIndex);
// Remember which local content matches this entry.
if (TOSFileName[0] != '.')
{
LocalDirectoryContentInfo newLocalDirectoryContentInfo = new LocalDirectoryContentInfo()
{
ParentDirectory = _clusterInfos[directoryClusterIndex]?.LocalDirectoryContent,
LocalFileName = fileName,
TOSFileName = TOSFileName,
EntryIndex = entryIndex,
DirectoryCluster = directoryClusterIndex,
StartCluster = entryStartClusterIndex
};
localDirectoryContentInfos.Add(newLocalDirectoryContentInfo);
// Cluster index 0 indicates empty file, so no data clusters to update
if (entryStartClusterIndex != 0)
{
_clusterInfos[entryStartClusterIndex].LocalDirectoryContent = newLocalDirectoryContentInfo;
int clusterValue = FatGetClusterValue(entryStartClusterIndex);
while (!FAT16Helper.IsEndOfFile(clusterValue))
{
_clusterInfos[clusterValue].LocalDirectoryContent = newLocalDirectoryContentInfo;
clusterValue = FatGetClusterValue(clusterValue);
}
}
}
// File name.
int fileNameIndex;
for (fileNameIndex = 0; fileNameIndex < (8 + 3); fileNameIndex++)
{
directoryBuffer[entryIndex + fileNameIndex] = 0x20;
}
string[] nameAndExtender;
byte[] asciiName;
byte[] asciiExtender;
if (TOSFileName == "." || TOSFileName == "..")
{
asciiName = ASCIIEncoding.ASCII.GetBytes(TOSFileName);
asciiExtender = null;
}
else
{
nameAndExtender = TOSFileName.Split('.');
asciiName = ASCIIEncoding.ASCII.GetBytes(nameAndExtender[0]);
asciiExtender = nameAndExtender.Length == 2 ? ASCIIEncoding.ASCII.GetBytes(nameAndExtender[1]) : null;
}
for (fileNameIndex = 0; fileNameIndex < asciiName.Length; fileNameIndex++)
{
directoryBuffer[entryIndex + fileNameIndex] = asciiName[fileNameIndex];
}
if (asciiExtender != null)
{
for (fileNameIndex = 0; fileNameIndex < asciiExtender.Length; fileNameIndex++)
{
directoryBuffer[entryIndex + 8 + fileNameIndex] = asciiExtender[fileNameIndex];
}
}
// File attribute flags.
directoryBuffer[entryIndex + 11] = attributeFlags;
// File write time and date (little endian).
UInt16 fatFileWriteTime = 0;
UInt16 fatFileWriteDate = 0;
int TwoSeconds = lastWriteDateTime.Second / 2;
int Minutes = lastWriteDateTime.Minute;
int Hours = lastWriteDateTime.Hour;
int DayOfMonth = lastWriteDateTime.Day;
int Month = lastWriteDateTime.Month;
int YearsSince1980 = lastWriteDateTime.Year - 1980;
fatFileWriteTime |= (UInt16)TwoSeconds;
fatFileWriteTime |= (UInt16)(Minutes << 5);
fatFileWriteTime |= (UInt16)(Hours << 11);
fatFileWriteDate |= (UInt16)DayOfMonth;
fatFileWriteDate |= (UInt16)(Month << 5);
fatFileWriteDate |= (UInt16)(YearsSince1980 << 9);
directoryBuffer[entryIndex + 22] = (byte)(fatFileWriteTime & 0xff);
directoryBuffer[entryIndex + 23] = (byte)((fatFileWriteTime >> 8) & 0xff);
directoryBuffer[entryIndex + 24] = (byte)(fatFileWriteDate & 0xff);
directoryBuffer[entryIndex + 25] = (byte)((fatFileWriteDate >> 8) & 0xff);
// Cluster (little endian).
directoryBuffer[entryIndex + 26] = (byte)(entryStartClusterIndex & 0xff);
directoryBuffer[entryIndex + 27] = (byte)((entryStartClusterIndex >> 8) & 0xff);
// File size (little endian).
directoryBuffer[entryIndex + 28] = (byte)(fileSize & 0xff);
directoryBuffer[entryIndex + 29] = (byte)((fileSize >> 8) & 0xff);
directoryBuffer[entryIndex + 30] = (byte)((fileSize >> 16) & 0xff);
directoryBuffer[entryIndex + 31] = (byte)((fileSize >> 24) & 0xff);
return(true);
}
private void UpdateLocalDirectoryOrFile(List <LocalDirectoryContentInfo> localDirectoryContentInfos, byte[] directoryData,
int directoryClusterIndex, int directoryEntryIndex, int entryStartClusterIndex, string newContentName)
{
string newContentPath = null;
if (directoryClusterIndex != _rootDirectoryClusterIndex)
{
string newPathDirectory = _clusterInfos[directoryClusterIndex].LocalDirectoryContent.LocalPath;
newContentPath = Path.Combine(newPathDirectory, newContentName);
}
else
{
newContentPath = newContentName;
}
try
{
if (directoryData[directoryEntryIndex + 11] == FAT16Helper.DirectoryIdentifier)
{
// Is it a directory with a valid start cluster?
if (entryStartClusterIndex != 0)
{
_logger.Log("Creating local directory \"" + newContentPath + "\"", Constants.LoggingLevel.Info);
var CreatedLocalDirectory = Directory.CreateDirectory(GetAbsolutePath(newContentPath));
var newLocalDirectoryContent = new LocalDirectoryContentInfo
{
ParentDirectory = _clusterInfos[directoryClusterIndex]?.LocalDirectoryContent,
LocalFileName = newContentName,
TOSFileName = newContentName,
EntryIndex = directoryEntryIndex,
DirectoryCluster = directoryClusterIndex,
StartCluster = entryStartClusterIndex,
FinalCluster = entryStartClusterIndex,
WriteInProgress = false
};
localDirectoryContentInfos.Add(newLocalDirectoryContent);
_clusterInfos[entryStartClusterIndex].LocalDirectoryContent = newLocalDirectoryContent;
_clusterInfos[entryStartClusterIndex].FileOffset = FAT16Helper.DirectoryFileOffset;
}
}
// it's a file
else
{
_logger.Log($"Checking if local file {newContentPath} should be updated", Constants.LoggingLevel.Debug);
int fileSize = directoryData[directoryEntryIndex + 28] | (directoryData[directoryEntryIndex + 29] << 8) | (directoryData[directoryEntryIndex + 30] << 16) | (directoryData[directoryEntryIndex + 31] << 24);
_logger.Log("File size to write:" + fileSize, Constants.LoggingLevel.All);
int fileClusterIndex = entryStartClusterIndex;
_logger.Log("Finding existing content info for local file \"" + newContentPath + "\".", Constants.LoggingLevel.All);
var localDirectoryContent = localDirectoryContentInfos.Where(ldci => ldci.LocalPath == newContentPath).SingleOrDefault();
if (localDirectoryContent == null)
{
_logger.Log($"Creating local file: {newContentPath}", Constants.LoggingLevel.Info);
File.Create(GetAbsolutePath(newContentPath)).Dispose();
var newLocalDirectoryContent = new LocalDirectoryContentInfo
{
ParentDirectory = _clusterInfos[directoryClusterIndex]?.LocalDirectoryContent,
LocalFileName = newContentName,
TOSFileName = newContentName,
EntryIndex = directoryEntryIndex,
DirectoryCluster = directoryClusterIndex,
StartCluster = entryStartClusterIndex,
FinalCluster = -1
};
localDirectoryContentInfos.Add(newLocalDirectoryContent);
localDirectoryContent = newLocalDirectoryContent;
}
localDirectoryContent.StartCluster = entryStartClusterIndex;
_logger.Log("File start cluster: " + localDirectoryContent.StartCluster + " (" + FatGetClusterValue(localDirectoryContent.StartCluster) + ")", Constants.LoggingLevel.All);
// Entry cluster will be assigned if this is a non-empty file
if (entryStartClusterIndex != 0)
{
localDirectoryContent.WriteInProgress = true;
_logger.Log("Content marked for write: " + localDirectoryContent.WriteInProgress, Constants.LoggingLevel.All);
int remainingBytes = fileSize;
// Check if the file has been completely written.
// Number of bytes in the cluster chain must be checked in case this file is being written
// in multiple passes due to lack of available RAM on the Atari
while (!FAT16Helper.IsEndOfClusterChain(fileClusterIndex))
{
// Keep final cluster updated in case this file is being written in multiple passes
localDirectoryContent.FinalCluster = fileClusterIndex;
remainingBytes -= Parameters.BytesPerCluster;
fileClusterIndex = FatGetClusterValue(fileClusterIndex);
}
bool allBytesAvailable = remainingBytes <= 0 && FAT16Helper.IsEndOfFile(fileClusterIndex);
_logger.Log("All bytes available?: " + allBytesAvailable, Constants.LoggingLevel.All);
// Final FAT cluster value in chain matches a fully written file
if (allBytesAvailable)
{
localDirectoryContent.WriteInProgress = false;
try
{
_logger.Log("Finding existing content info for local file \"" + newContentPath + "\".", Constants.LoggingLevel.All);
localDirectoryContent = localDirectoryContentInfos.Where(ldci => ldci.LocalPath == newContentPath).Single();
localDirectoryContent.StartCluster = entryStartClusterIndex;
_logger.Log("Writing to local file \"" + newContentPath + "\".", Constants.LoggingLevel.Info);
using (BinaryWriter FileBinaryWriter = new BinaryWriter(File.OpenWrite(GetAbsolutePath(newContentPath))))
{
fileClusterIndex = entryStartClusterIndex;
remainingBytes = fileSize;
int fileOffset = 0;
while (!FAT16Helper.IsEndOfFile(fileClusterIndex))
{
_clusterInfos[fileClusterIndex].LocalDirectoryContent = localDirectoryContent;
_clusterInfos[fileClusterIndex].FileOffset = fileOffset;
FileBinaryWriter.Write(_clusterInfos[fileClusterIndex].DataBuffer, 0, Math.Min(_clusterInfos[fileClusterIndex].DataBuffer.Length, remainingBytes));
remainingBytes -= _clusterInfos[fileClusterIndex].DataBuffer.Length;
fileOffset += _clusterInfos[fileClusterIndex].DataBuffer.Length;
// Buffer has been written to disk; free up RAM
_clusterInfos[fileClusterIndex].DataBuffer = null;
localDirectoryContent.FinalCluster = fileClusterIndex;
fileClusterIndex = FatGetClusterValue(fileClusterIndex);
}
_logger.Log("Bytes remaining after write:" + remainingBytes, Constants.LoggingLevel.All);
}
}
catch (Exception ex)
{
_logger.LogException(ex);
}
}
}
}
}
catch (Exception ex)
{
_logger.LogException(ex);
}
}
private void SyncDirectoryClusterToLocalDisk(List <LocalDirectoryContentInfo> localDirectoryContentInfos, int clusterIndex)
{
byte[] directoryData;
directoryData = GetDirectoryClusterData(clusterIndex);
// Only check for changes if this cluster contains directory entry information
if (clusterIndex == _rootDirectoryClusterIndex || _clusterInfos[clusterIndex].FileOffset == -1)
{
bool continueCheckingEntries = true;
do
{
_logger.Log($"Updating directory cluster {clusterIndex}", Constants.LoggingLevel.All);
int directoryEntryIndex = 0;
while (directoryEntryIndex < directoryData.Length && directoryData[directoryEntryIndex] != 0)
{
// The entry is not "." or "..".
if (directoryData[directoryEntryIndex] != 0x2e)
{
string fileName = ASCIIEncoding.ASCII.GetString(directoryData, directoryEntryIndex, 8).Trim();
string fileExtension = ASCIIEncoding.ASCII.GetString(directoryData, directoryEntryIndex + 8, 3).Trim();
if (fileExtension != "")
{
fileName += "." + fileExtension;
}
int entryStartClusterIndex = directoryData[directoryEntryIndex + 26] | (directoryData[directoryEntryIndex + 27] << 8);
// Find the matching local content and check what happened to it.
var localContent = FindLocalDirectoryContentInfo(localDirectoryContentInfos, clusterIndex, directoryEntryIndex, entryStartClusterIndex);
if (localContent != null)
{
if (localContent.TOSFileName != fileName)
{
if (directoryData[directoryEntryIndex] == FAT16Helper.DeletedEntryIdentifier)
{
DeleteLocalDirectoryOrFile(localDirectoryContentInfos, directoryData, directoryEntryIndex, localContent);
}
else
{
RenameLocalDirectoryOrFile(directoryData, directoryEntryIndex, localContent, fileName);
}
}
}
// Entry is new
else if (directoryData[directoryEntryIndex] != FAT16Helper.DeletedEntryIdentifier)
{
UpdateLocalDirectoryOrFile(localDirectoryContentInfos, directoryData, clusterIndex, directoryEntryIndex, entryStartClusterIndex, fileName);
}
}
directoryEntryIndex += 32;
}
if (directoryEntryIndex < directoryData.Length || FAT16Helper.IsEndOfClusterChain(FatGetClusterValue(clusterIndex)))
{
continueCheckingEntries = false;
}
else
{
var nextClusterIndex = FatGetClusterValue(clusterIndex);
_logger.Log($"Directory cluster {clusterIndex} continues in cluster {nextClusterIndex}", Constants.LoggingLevel.All);
// If the next directory cluster is new, ensure it has a LocalDirectoryContentInfo assigned
if (_clusterInfos[nextClusterIndex].LocalDirectoryContent == null)
{
_clusterInfos[nextClusterIndex].LocalDirectoryContent = _clusterInfos[clusterIndex].LocalDirectoryContent;
_clusterInfos[nextClusterIndex].FileOffset = FAT16Helper.DirectoryFileOffset;
_logger.Log($"Directory cluster {clusterIndex} extended to cluster {nextClusterIndex}", Constants.LoggingLevel.All);
}
clusterIndex = nextClusterIndex;
directoryData = GetDirectoryClusterData(clusterIndex);
}
} while (continueCheckingEntries);
}
}
public void ValidDiskSizes(TOSVersion tosVersion, int expectedMaxDiskSizeBytes)
{
var maxDiskSizeBytes = FAT16Helper.MaxDiskSizeBytes(tosVersion, _sectorsPerCluster);
Assert.AreEqual(expectedMaxDiskSizeBytes, maxDiskSizeBytes);
}
public void CreateShortFileNameFromInvalidFileName(string invalidFileName, string expectedShortFileName)
{
var shortFileName = FAT16Helper.GetShortFileName(invalidFileName);
Assert.AreEqual(expectedShortFileName, shortFileName);
}
public void CreateShortFileNameFromLongFileName(string longFileName, string expectedShortFileName)
{
var shortFileName = FAT16Helper.GetShortFileName(longFileName);
Assert.AreEqual(expectedShortFileName, shortFileName);
}
