private T ReadValue <T>(Guid itemId, bool isUser, Reader <T> reader)
{
MetadataEntryKey key = new MetadataEntryKey(itemId, isUser);
MetadataEntry entry;
if (Table.Entries.TryGetValue(key, out entry))
{
_regionStream.Position = entry.Offset;
byte[] data = Utilities.ReadFully(_regionStream, ReflectionHelper.SizeOf <T>());
return(reader(data, 0));
}
return(default(T));
}
private T ReadStruct <T>(Guid itemId, bool isUser)
where T : IByteArraySerializable, new()
{
MetadataEntryKey key = new MetadataEntryKey(itemId, isUser);
MetadataEntry entry;
if (Table.Entries.TryGetValue(key, out entry))
{
_regionStream.Position = entry.Offset;
return(Utilities.ReadStruct <T>(_regionStream, (int)entry.Length));
}
return(default(T));
}
private static uint AddEntryStruct <T>(T data, Guid id, MetadataEntryFlags flags, MetadataTable header, uint dataOffset, Stream stream)
where T : IByteArraySerializable
{
MetadataEntryKey key = new MetadataEntryKey(id, (flags & MetadataEntryFlags.IsUser) != 0);
MetadataEntry entry = new MetadataEntry();
entry.ItemId = id;
entry.Offset = dataOffset;
entry.Length = (uint)data.Size;
entry.Flags = flags;
header.Entries[key] = entry;
stream.Position = dataOffset;
Utilities.WriteStruct(stream, data);
return(entry.Length);
}
public int ReadFrom(byte[] buffer, int offset)
{
Array.Copy(buffer, offset, _headerData, 0, 32);
Signature = Utilities.ToUInt64LittleEndian(_headerData, 0);
EntryCount = Utilities.ToUInt16LittleEndian(_headerData, 10);
Entries = new Dictionary <MetadataEntryKey, MetadataEntry>();
if (IsValid)
{
for (int i = 0; i < EntryCount; ++i)
{
MetadataEntry entry = Utilities.ToStruct <MetadataEntry>(buffer, offset + 32 + (i * 32));
Entries[MetadataEntryKey.FromEntry(entry)] = entry;
}
}
return(FixedSize);
}
private static uint AddEntryValue <T>(T data, Writer <T> writer, Guid id, MetadataEntryFlags flags, MetadataTable header, uint dataOffset, Stream stream)
{
MetadataEntryKey key = new MetadataEntryKey(id, (flags & MetadataEntryFlags.IsUser) != 0);
MetadataEntry entry = new MetadataEntry();
entry.ItemId = id;
entry.Offset = dataOffset;
entry.Length = (uint)Marshal.SizeOf(typeof(T));
entry.Flags = flags;
header.Entries[key] = entry;
stream.Position = dataOffset;
byte[] buffer = new byte[entry.Length];
writer(data, buffer, 0);
stream.Write(buffer, 0, buffer.Length);
return(entry.Length);
}
