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Fix up bad layout of some comments (probably pg_indent's fault), and

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improve grammar a tad.  Per Greg Stark.
This commit is contained in:
Tom Lane 2007-08-04 21:53:00 +00:00
parent 087a271327
commit 8d30337566
2 changed files with 26 additions and 26 deletions
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24
src/backend/utils/adt/pg_lzcompress.c
View File

@ -166,7 +166,7 @@
*
* Copyright (c) 1999-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.26 2007/04/06 04:21:43 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.27 2007/08/04 21:53:00 tgl Exp $
* ----------
*/
#include "postgres.h"
@ -211,29 +211,27 @@ typedef struct PGLZ_HistEntry
* ----------
*/
static const PGLZ_Strategy strategy_default_data = {
256, /* Data chunks smaller 256 bytes are not
256, /* Data chunks less than 256 bytes are not
* compressed */
6144, /* Data chunks greater equal 6K force
* compression */
/* except compressed result is greater uncompressed data */
20, /* Compression rates below 20% mean fallback
* to uncompressed */
/* storage except compression is forced by previous parameter */
6144, /* Data chunks >= 6K force compression, unless
* compressed output is larger than input */
20, /* Below 6K, compression rates below 20% mean
* fallback to uncompressed */
128, /* Stop history lookup if a match of 128 bytes
* is found */
10 /* Lower good match size by 10% at every
* lookup loop iteration. */
* lookup loop iteration */
};
const PGLZ_Strategy * const PGLZ_strategy_default = &strategy_default_data;
static const PGLZ_Strategy strategy_always_data = {
0, /* Chunks of any size are compressed */
0, /* */
0, /* We want to save at least one single byte */
0,
0, /* It's enough to save one single byte */
128, /* Stop history lookup if a match of 128 bytes
* is found */
6 /* Look harder for a good match. */
6 /* Look harder for a good match */
};
const PGLZ_Strategy * const PGLZ_strategy_always = &strategy_always_data;
@ -511,7 +509,7 @@ pglz_compress(const char *source, int32 slen, PGLZ_Header *dest,
* If the strategy forbids compression (at all or if source chunk too
* small), fail.
*/
if (strategy->match_size_good == 0 ||
if (strategy->match_size_good <= 0 ||
slen < strategy->min_input_size)
return false;

18
src/include/utils/pg_lzcompress.h
View File

@ -3,7 +3,7 @@
*
* Definitions for the builtin LZ compressor
*
* $PostgreSQL: pgsql/src/include/utils/pg_lzcompress.h,v 1.14 2007/02/27 23:48:10 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/pg_lzcompress.h,v 1.15 2007/08/04 21:53:00 tgl Exp $
* ----------
*/
@ -50,16 +50,18 @@ typedef struct PGLZ_Header
*
* min_input_size Minimum input data size to start compression.
*
* force_input_size Input data size at which compressed storage is
* forced even if the compression rate drops below
* min_comp_rate (but not below 0).
*
* min_comp_rate Minimum compression rate (0-99%), the output
* force_input_size Minimum input data size to force compression
* even if the compression rate drops below
* min_comp_rate. But in any case the output
* must be smaller than the input. If that isn't
* the case, the compressor will throw away its
* output and copy the original, uncompressed data
* to the output buffer.
*
* min_comp_rate Minimum compression rate (0-99%) to require for
* inputs smaller than force_input_size. If not
* achieved, the output will be uncompressed.
*
* match_size_good The initial GOOD match size when starting history
* lookup. When looking up the history to find a
* match that could be expressed as a tag, the
@ -70,8 +72,8 @@ typedef struct PGLZ_Header
* longer the lookup takes, the smaller matches
* are considered good.
*
* match_size_drop The percentage, match_size_good is lowered
* at each history check. Allowed values are
* match_size_drop The percentage by which match_size_good is lowered
* after each history check. Allowed values are
* 0 (no change until end) to 100 (only check
* latest history entry at all).
* ----------