| 摘要 |
<p>The present invention allows for decompression in either the forward or reverse directions. Such reversibility can be accomplished in one of two primary ways. First, a periodic marker can be placed (602) in the compressed data stream. Each marker contains information necessary to decode a block of the compressed data and possibly the location of the next marker. Thus, by retrieving (702) the markers in proper order and decompressing (703) the blocks, the decompression can be guided in either the forward or reverse direction. Another approach assumes that the compression method itself is periodic. Using this assumption, decompression (502) can start at any periodic block of compressed data. By simply stepping through the periodic blocks in the reverse order (503), the data can be decompressed in the reverse direction. <IMAGE></p> |
