Tcl Source Code

This is similar to DKF's solution of [Bug #131523]:
when splitting binary strings into integer components
(c*, s*, S*, i*, I* format strings), it avoids creating
a Tcl_Obj per integer. Using a hash table, it creates
just one Tcl_Obj per integer, with multiple assignments
if it appears more than once.

Makes a huge difference to splitting of long binary
strings, such as is done in the mime package in tcllib.

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I've had a look at this, and found that the most effective
technique was to limit the size of the cache (260 entries
worked well and should handle the split-byte-case nicely)
and *delete* the cache and stop looking once the number of
elements exceeded that. I suppose this has something to do
with the marginal benefit from adding a few more elements at
that size being very small. Not particularly obvious, I must
admit...

File Added - 6978: binary.patch

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This doesn't improve speed because the ScanNumber
always creates an object.  A slight change allows
this to improve speed (attached patch), but only
starting at 5000 byte of input (as opposed to the
split version, which benefits already at 500 chars).

File Added - 6976: binary.patch