pull-stream throughs for manipulating (splitting, etc) buffers
This is a suite of pull-stream
throughs that are used to manipulate an incoming buffer into component
parts. In a very simple case it could be used to split a file on
newline characters (
\n). In a more complicated case it could be used
to identify separate chunks in a bzip2
Separate a single input buffer into frames. The incoming stream will be collected until we have identified that a matching header or footer (or both) have been successfully identified.
The behaviour of this particular through stream depends on the requested behaviour:
for a header-only search, once another matching header is identified the through stream will pass that frame on. In the case of the header only search, the EOF file considered to match a new header also.
for a footer-only search, once the footer is identified all queued data is passed on as a frame.
when both a matching header and footer are required, once we have a match at both ends that is passed on as a frame.
Split an incoming buffer into separate parts, and throw away the delimiters. The following is a pretty contrived example, but demonstrates the idea:
var bits = ;var pull = ;var input = 1 2 3 4 5 6;console;// --> <Buffer 31 0a 32 0a 33 0a 34 0a 35 0a 36>;// --> <Buffer 31>// --> <Buffer 32>// --> <Buffer 33>// --> <Buffer 34>// --> <Buffer 35>// --> <Buffer 36>
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