public bool FindNextFile(ref SaveFindPosition position, out SaveFileInfo info, out string name)
{
if (position.NextFile == 0)
{
info = default;
name = default;
return(false);
}
Span <byte> nameBytes = stackalloc byte[FileTable.MaxNameLength];
bool success = FileTable.TryGetValue(position.NextFile, out TableEntry <SaveFileInfo> entry, ref nameBytes);
// todo error message
if (!success)
{
info = default;
name = default;
return(false);
}
position.NextFile = entry.NextSibling;
info = entry.Value;
name = Util.GetUtf8StringNullTerminated(nameBytes);
return(true);
}
public void CreateFile(string path, long size, CreateFileOptions options)
{
path = PathTools.Normalize(path);
if (size == 0)
{
var emptyFileEntry = new SaveFileInfo {
StartBlock = int.MinValue, Length = size
};
FileTable.AddFile(path, ref emptyFileEntry);
return;
}
int blockCount = (int)Util.DivideByRoundUp(size, AllocationTable.Header.BlockSize);
int startBlock = AllocationTable.Allocate(blockCount);
if (startBlock == -1)
{
ThrowHelper.ThrowResult(ResultFs.AllocationTableInsufficientFreeBlocks,
"Not enough available space to create file.");
}
var fileEntry = new SaveFileInfo {
StartBlock = startBlock, Length = size
};
FileTable.AddFile(path, ref fileEntry);
}
public void AddFile(string path, ref SaveFileInfo fileInfo)
{
path = PathTools.Normalize(path);
ReadOnlySpan <byte> pathBytes = Util.GetUtf8Bytes(path);
if (path == "/")
{
throw new ArgumentException("Path cannot be empty");
}
CreateFileRecursive(pathBytes, ref fileInfo);
}
public bool TryOpenFile(string path, out SaveFileInfo fileInfo)
{
FindPathRecursive(Util.GetUtf8Bytes(path), out SaveEntryKey key);
if (FileTable.TryGetValue(ref key, out FileSaveEntry value))
{
fileInfo = value.Info;
return(true);
}
fileInfo = default;
return(false);
}
private void CreateFileRecursive(ReadOnlySpan <byte> path, ref SaveFileInfo fileInfo)
{
var parser = new PathParser(path);
var key = new SaveEntryKey(parser.GetCurrent(), 0);
int parentIndex = CreateParentDirectoryRecursive(ref parser, ref key);
int index = FileTable.GetIndexFromKey(ref key).Index;
TableEntry <SaveFileInfo> fileEntry = default;
// File already exists. Update file info.
if (index >= 0)
{
FileTable.GetValue(index, out fileEntry);
fileEntry.Value = fileInfo;
FileTable.SetValue(index, ref fileEntry);
return;
}
fileEntry.Value = fileInfo;
index = FileTable.Add(ref key, ref fileEntry);
LinkFileToParent(parentIndex, index);
}
