public Document(string fileName, byte[] buf)
{
FileName = fileName;
Name = Path.GetFileName(fileName);
Length = buf.Length;
FirstElement = new ElementUntyped(this);
FirstElement.Initialise(0, Length);
}
public Document(string fileName)
{
try
{
FileName = fileName;
Name = Path.GetFileName(fileName);
Buffer = File.ReadAllBytes(fileName);
Length = Buffer.Length;
FirstElement = new ElementUntyped(this);
FirstElement.Initialise(0, Length);
FirstElement.Name = GetAutoName(this);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e);
}
}
/// <summary>
/// Inserts a new element into an ElementUntyped.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="src">The element to insert the new element into.</param>
/// <param name="offset">In bytes, relative to the start of the src element.</param>
/// <param name="length">In bytes of the new element. This will be rounded down to the largest number of complete items that fit.</param>
/// <returns></returns>
protected static Element Insert <T>(Element src, int offset, int length) where T : Element
{
// Don't call this on anything other than untyped elements:
if (!(src is ElementUntyped))
{
return(null);
}
Document document = src.Document;
Element newElement = (T)Activator.CreateInstance(typeof(T), document);
newElement.Name = GetAutoName(document);
int bytesPerItem = newElement.BytesPerItem;
int actualLength = (length / bytesPerItem) * bytesPerItem; // Round down to the maximum number of complete items
// Do we have enough bytes within the src element?
if (actualLength == 0 || src.Length < offset + actualLength)
{
throw new ArgumentOutOfRangeException(nameof(length), length,
$"There are not enough bytes in the buffer to insert type {newElement.TypeName}, a multiple of {bytesPerItem} bytes are required.");
}
int bytesBefore = offset;
int bytesMiddle = actualLength;
int bytesAfter = src.Length - offset - actualLength;
int offsetMiddle = offset;
int offsetAfter = offset + actualLength;
newElement.Initialise(src.Offset + offsetMiddle, bytesMiddle);
if (offsetMiddle > 0 && bytesAfter > 0)
{
ElementUntyped after = new ElementUntyped(document)
{
Name = GetAutoName(document)
};
after.Initialise(src.Offset + offsetAfter, bytesAfter);
newElement.Append(after);
src.Length = bytesBefore;
src.Append(newElement);
}
else if (offsetMiddle == 0 && bytesAfter > 0)
{
if (src.PreviousElement == null)
{
document.FirstElement = newElement;
}
src.Offset = src.Offset + offsetAfter;
src.Length = bytesAfter;
src.Prepend(newElement);
}
else if (offsetMiddle > 0 && bytesAfter == 0)
{
src.Length = bytesBefore;
src.Append(newElement);
}
else if (offsetMiddle == 0 && bytesAfter == 0)
{
if (src.PreviousElement == null)
{
document.FirstElement = newElement;
}
newElement.Name = src.Name;
src.Append(newElement);
src.Remove();
}
document.RaiseSequenceChanged();
return(newElement);
}