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Improve const use in zlib-using code
If we define ZLIB_CONST before including zlib.h, zlib augments some
interfaces with const decorations. By doing that we can keep our own
interfaces cleaner and can remove some unconstify calls.
ZLIB_CONST was introduced in zlib 1.2.5.2 (17 Dec 2011). When
compiling with older zlib releases, you might now get compiler
warnings about discarding qualifiers.
CentOS 6 has zlib 1.2.3, but in 8e278b6576
, we removed support for the
OpenSSL release in CentOS 6, so it seems ok to de-support the zlib
release in CentOS 6 as well.
Reviewed-by: Tristan Partin <tristan@neon.tech>
Discussion: https://www.postgresql.org/message-id/flat/33462926-bb1e-7cc9-8d92-d86318e8ed1d%40eisentraut.org
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@ -113,7 +113,7 @@ compress_process(PushFilter *next, void *priv, const uint8 *data, int len)
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/*
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* process data
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*/
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st->stream.next_in = unconstify(uint8 *, data);
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st->stream.next_in = data;
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st->stream.avail_in = len;
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while (st->stream.avail_in > 0)
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{
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