public ArchiveFileStream CreateFile(string name, bool deleteExisting = false)
{
if (Files.ContainsKey(name))
{
if (!deleteExisting)
{
return(OpenFile(name, true));
}
Files[name].CloseAll();
Files.Remove(name);
return(OpenFile(name, true));
}
var file = new ArchiveFile(this, name, 0, 0);
file.MarkDirty();
Files[name] = file;
return(file.Open(true));
}
internal static Dictionary <string, ArchiveFile> ReadIndex(Archive archive, BinaryReader r)
{
int count = (int)(archive.Header.IndexLength / EntrySize);
var index = new List <ArchiveEntry>();
r.Seek(archive.Header.IndexOffset);
for (int i = 0; i < count; i++)
{
index.Add(ReadIndexEntry(r));
}
var dict = new Dictionary <string, ArchiveFile>(count, StringComparer.InvariantCultureIgnoreCase);
foreach (var entry in index)
{
var name = r.Seek(entry.NameOffset).ReadString(entry.NameLength);
var file = new ArchiveFile(archive, name, entry.DataOffset, entry.DataLength);
dict[name] = file;
}
return(dict);
}
internal ArchiveFileStream(ArchiveFile file, Stream baseStream)
{
File = file;
BaseStream = baseStream;
}
internal bool SaveFile(ArchiveFile file, MemoryStream data)
{
lock (_syncRoot) {
var w = new BinaryWriter(Stream);
switch (SaveMode)
{
case ArchiveSaveMode.Explicit:
// mark file as dirty, but don't save to disk
MarkDirty();
file.MarkDirty();
file.NewData = data.ToArray();
file.DataLength = file.NewData.Length;
return(true);
case ArchiveSaveMode.Flush:
MarkDirty();
// if index and the old file data are in the back of the file (this file was last updated), overwrite them.
// otherwise, the old file data will be kept until Flush() is called and the entire archive is written again.
long newFileOffset = Stream.Length;
if (Header.IndexOffset + Header.IndexLength == newFileOffset)
{
// Index is at the end of the file, overwrite it
newFileOffset = Header.IndexOffset;
}
if (file.DataOffset + file.DataLength == newFileOffset)
{
// Old file data is at the end, overwrite it
newFileOffset = file.DataOffset;
}
file.DataOffset = newFileOffset;
file.DataLength = data.Length;
// write file data
Stream.SetLength(newFileOffset);
Stream.Seek(newFileOffset);
data.Seek(0).CopyTo(Stream);
// write index
Header.IndexOffset = (uint)Stream.Position;
ArchiveHelpers.WriteIndex(Files, w);
// update header
Stream.Seek(0);
ArchiveHelpers.WriteHeader(Header, w);
Stream.Flush();
return(true);
case ArchiveSaveMode.Immediate:
MarkDirty();
Stream.Seek(0, SeekOrigin.End);
// write file name
file.NameOffset = (uint)Stream.Position;
w.WriteNullTerminatedString(file.Name);
// write file data
file.DataOffset = (uint)Stream.Position;
data.Seek(0).CopyTo(Stream);
file.DataLength = (uint)(Stream.Position - file.DataOffset);
return(true);
default:
return(false);
}
}
}