Sack Library Documentation
sack::image::data_transfer_state_tag Structure
struct data_transfer_state_tag {
  _32 size;
  _32 offset;
  CDATA buffer;
_32 size; 
size of this block of data. 
_32 offset; 
offset of the data in the total message. Have to break up large buffers into smaller chunks for transfer. 
CDATA buffer; 
buffer containing the data to transfer. 

A definition of a block structure to transport font and image data across message queues. Type of buffer used to transfer data across message queues.

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