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4 bytes and reduces running time by one half of one percent.
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based handling of a 6-byte header with with two 24-bit integer reads. Use
xmalloc() and xzalloc().
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for limit[] to move a test out of a loop. Unroll a single-bit get_bits()
to avoid a function call in the common case on a hot path. And one more
application of the old "two tests in one via typecasting and/or math" trick.
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but it looks cleaner.
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out how to turn an if/else into a multiply and subtract (saving 2 bytes).
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out the bunzip2 library.
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unrolling a small memmove.
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