/// <summary>
/// Adds a tag to the file.
/// </summary>
/// <param name="stream">The stream to write to.</param>
/// <param name="data">The tag data. Must include the header.</param>
/// <returns>The new tag.</returns>
public HaloTag AddTag(Stream stream, byte[] data)
{
// Push back the data at the end of the file and write the tag in after the last tag
var newTagOffset = GetTagDataEndOffset();
StreamUtil.Copy(stream, newTagOffset, newTagOffset + data.Length, stream.Length - newTagOffset);
stream.Position = newTagOffset;
stream.Write(data, 0, data.Length);
// Create an object for the tag and add it to the tag list
var tagIndex = _tags.Count;
var newTag = new HaloTag {
Index = tagIndex
};
_headerOffsets.Add(newTagOffset);
_tags.Add(newTag);
// Read the tag's header from the stream
stream.Position = newTagOffset;
ReadTagHeader(new BinaryReader(stream), newTag);
// Update the tag offset table
UpdateTagOffsets(new BinaryWriter(stream));
return(newTag);
}
/// <summary>
/// Resizes a block of data in the file and updates tag offsets.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="tag">The tag that the block belongs to, if any.</param>
/// <param name="startOffset">The offset where the block to resize begins at.</param>
/// <param name="oldSize">The current size of the block to resize.</param>
/// <param name="newSize">The new size of the block.</param>
/// <exception cref="System.ArgumentException">Cannot resize a block to a negative size</exception>
private void ResizeBlock(Stream stream, TagInstance tag, long startOffset, long oldSize, long newSize)
{
if (newSize < 0)
{
throw new ArgumentException("Cannot resize a block to a negative size");
}
var oldEndOffset = startOffset + oldSize;
var sizeDelta = newSize - oldSize;
StreamUtil.Copy(stream, oldEndOffset, oldEndOffset + sizeDelta, stream.Length - oldEndOffset);
FixTagOffsets(oldEndOffset, sizeDelta, tag);
}
