/// <summary>
/// Modifies a current key as a new entry.
/// </summary>
/// <param name="infoKey">Entry to modify.</param>
/// <param name="newEntryPath">Path for the entry.</param>
/// <returns></returns>
private FileInfoKey ModifyExistingEntryAsNew(FileInfoKey infoKey, string newEntryPath)
{
// Check paths
string[] pathParts = newEntryPath.Split(Path.AltDirectorySeparatorChar);
FileEntryBTree currentSubTree = Files[0];
uint newKeyIndex = NextEntryIndex();
// Find the entry key and update it
for (int i = 0; i < pathParts.Length; i++)
{
if (i != pathParts.Length - 1)
{
// Check actual folders
int keyIndex = FileNames.GetIndexOfString(pathParts[i]);
if (keyIndex == -1)
{
throw new ArgumentNullException($"Entry Key for file info key ({infoKey}) has missing file name key: {pathParts[i]}");
}
FileEntryKey subTreeKey = currentSubTree.GetFolderEntryByNameIndex((uint)keyIndex);
if (subTreeKey is null)
{
throw new InvalidOperationException($"Tried to modify existing key {newEntryPath} (str index: {keyIndex}), but missing in entries");
}
else if (!subTreeKey.Flags.HasFlag(EntryKeyFlags.Directory))
{
throw new InvalidOperationException($"Tried to modify existing key {newEntryPath} but entry key ({subTreeKey}) is not marked as directory. Is the volume corrupted?");
}
currentSubTree = Files[(int)subTreeKey.EntryIndex];
}
else
{
// Got the location for the subtree
// Get our actual file entry key
FileEntryKey entryKey = currentSubTree.Entries.FirstOrDefault(e => e.EntryIndex == infoKey.FileIndex);
if (entryKey is null)
{
throw new ArgumentNullException($"Entry Key for file info key ({infoKey}) is missing while modifying.");
}
// Update it actually
entryKey.EntryIndex = newKeyIndex;
}
}
// Find the original entry key, copy from it, add to the tree
foreach (FileEntryBTree tree in Files)
{
foreach (FileEntryKey child in tree.Entries)
{
if (child.EntryIndex == infoKey.FileIndex) // If the entry key exists, add it
{
var fileInfo = new FileInfoKey(newKeyIndex);
fileInfo.CompressedSize = infoKey.CompressedSize;
fileInfo.UncompressedSize = infoKey.UncompressedSize;
fileInfo.SegmentIndex = NextSegmentIndex(); // Pushed to the end, so technically the segment is new, will be readjusted at the end anyway
fileInfo.Flags = infoKey.Flags;
FileInfos.Entries.Add(fileInfo);
return(fileInfo);
}
}
}
// If it wasn't found, then we already have it
infoKey.FileIndex = newKeyIndex;
// Move it to the last
FileInfos.Entries.Remove(infoKey);
FileInfos.Entries.Add(infoKey);
return(infoKey);
}