base64: provide a fast path for encoding well sized buffers

[gnulib.git] / ChangeLog

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+2013-11-11  Pádraig Brady <P@draigBrady.com>
+
+       base64: provide a fast path for encoding well sized buffers
+       Avoid conditionals in the base64 encoding loop,
+       which was seen to give 60% better throughput.
+       * lib/base64.c (base64_encode_fast): A new function to be called
+       when we don't want to NUL terminate, and we have enough space
+       in the output to encode the given input.
+       (base64_encode): Call the _fast() version when appropriate.
+       Also remove a redundant mask with 0x3F on the first encoded byte.
+
 2013-11-08  Paul Eggert  <eggert@cs.ucla.edu>
 
        extern-inline: port better to OS X 10.9