/// <summary>
/// Adds a template to a specified location. Replaces an existing template.
/// </summary>
/// <param name="template">the template value</param>
/// <param name="templateId">the template identifier</param>
private void AddTemplate(byte[] template, short templateId)
{
Debug.Assert(templateId <= compressors.Count);
TemplateBasedCompressor ct = new TemplateBasedCompressor(templateId, template, useHuff);
if (templateId < compressors.Count)
{
/*if this template is the same from before, we don't want to lose all the announcements
* we know from before. If we already have this exact template, it could be that someone
* else requested it and it was broadcast to everyone.*/
if (ct.Equals(compressors[templateId])) { return; }
/*else we should get rid of the old and bring in the new*/
compressors[templateId] = ct;
return;
}
//we haven't seen this before, add it; throws an exception if templateId > compressors.Count
compressors.Insert(templateId, ct);
}
/// <summary>
/// if we know a template that we would like to construct, we can give it to the Handler,
/// and it will add it.
/// </summary>
/// <param name="template"></param>
/// <returns></returns>
public short ConstructTemplate(byte[] template)
{
// for the duration of this method, lastTemplateId is the current templateId.
short templateId;
lock (this)
{
templateId = lastTemplateId = (short)((lastTemplateId + 1) % maximumTemplates);
}
Debug.Assert(templateId <= compressors.Count);
TemplateBasedCompressor ct = new TemplateBasedCompressor(templateId, template, useHuff);
if (templateId == compressors.Count) { compressors.Add(ct); }
else { compressors[templateId] = ct; }
return templateId;
}