/// <summary>
/// Reads the tags.dat file.
/// </summary>
/// <param name="reader">The stream to read from.</param>
/// <param name="names">The dictionary of tag instance names.</param>
private void Load(BinaryReader reader, Dictionary <int, string> names)
{
// Read file header
reader.BaseStream.Position = 0x4;
var tagListOffset = reader.ReadInt32(); // 0x4 uint32 offset table offset
var tagCount = reader.ReadInt32(); // 0x8 uint32 number of tags
reader.BaseStream.Position = 0x10;
Timestamp = reader.ReadInt64(); // 0x10 FILETIME timestamp
// Read tag offset list
var headerOffsets = new uint[tagCount];
reader.BaseStream.Position = tagListOffset;
for (var i = 0; i < tagCount; i++)
{
headerOffsets[i] = reader.ReadUInt32();
}
// Read each tag
for (var i = 0; i < tagCount; i++)
{
if (headerOffsets[i] == 0)
{
// Offset of 0 = null tag
_tags.Add(null);
continue;
}
string name = null;
if (names.ContainsKey(i))
{
name = names[i];
}
var tag = new CachedTagInstance(i, name)
{
HeaderOffset = headerOffsets[i]
};
_tags.Add(tag);
reader.BaseStream.Position = tag.HeaderOffset;
tag.ReadHeader(reader);
}
}
/// <summary>
/// Overwrites a tag's raw data, including its header.
/// </summary>
/// <param name="stream">The stream to write to.</param>
/// <param name="tag">The tag to overwrite.</param>
/// <param name="data">The data to overwrite the tag with.</param>
/// <exception cref="System.ArgumentNullException">tag</exception>
public void SetTagDataRaw(Stream stream, CachedTagInstance tag, byte[] data)
{
if (tag == null)
{
throw new ArgumentNullException(nameof(tag));
}
// Ensure the data fits
if (tag.HeaderOffset < 0)
{
tag.HeaderOffset = GetNewTagOffset(tag.Index);
}
ResizeBlock(stream, tag, tag.HeaderOffset, tag.TotalSize, data.Length);
tag.TotalSize = data.Length;
// Write the data
stream.Position = tag.HeaderOffset;
stream.Write(data, 0, data.Length);
// Re-parse it
stream.Position = tag.HeaderOffset;
tag.ReadHeader(new BinaryReader(stream));
UpdateTagOffsets(new BinaryWriter(stream));
}
