public Blob(List <object> sources, object properties = null)
{
_sources = new List <BufferRegion>();
_pointer = 0;
foreach (object source in sources)
{
if (source is FileInfo)
{
_sources.Add(new BufferRegion(new Buffer((FileInfo)source)));
_pointer += ((FileInfo)source).Length;
}
else if (source is byte[])
{
_sources.Add(new BufferRegion(new Buffer((byte[])source)));
_pointer += ((byte[])source).Length;
}
else if (source is MemoryStream)
{
_sources.Add(new BufferRegion(new Buffer((MemoryStream)source)));
_pointer += ((MemoryStream)source).Length;
}
else if (source is Blob)
{
((Blob)source)._sources.ForEach(delegate(BufferRegion region)
{
region.buffer.refs++;
_sources.Add(region);
_pointer += ((Blob)source).size;
});
}
else if (source is BufferRegion)
{
BufferRegion bufferRegion = (BufferRegion)source;
_sources.Add(new BufferRegion(bufferRegion.buffer, bufferRegion.start, bufferRegion.end));
_pointer += bufferRegion.end - bufferRegion.start;
}
}
if (properties is string)
{
_type = (string)properties;
}
else if (properties is Dictionary <string, string> )
{
string type;
if (((Dictionary <string, string>)properties).TryGetValue("type", out type))
{
_type = type;
}
}
_size = _pointer;
_uid = Utils.guid("uid_");
}
private void _readFromNextSource(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
if (_srcIdx >= _blob._sources.Count)
{
// we are out of sources
return;
}
// get the next one
BufferRegion src = _blob._sources[_srcIdx++];
// requested position is out of the boundaries of current source, bypass
if (src.size <= _position)
{
_position -= src.size;
_readFromNextSource(buffer, offset, count);
return;
}
src.Position = _position;
if ((bytesRead = src.Read(buffer, offset, count)) == 0)
{
return;
}
Position += bytesRead;
offset += bytesRead;
_bytesTotal += bytesRead;
// we need more, proceed if possible
if (bytesRead < count)
{
_position = 0;
count -= bytesRead;
_readFromNextSource(buffer, offset, count);
}
}
