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Commit8d30337

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committed
Fix up bad layout of some comments (probably pg_indent's fault), and
improve grammar a tad. Per Greg Stark.
1 parent087a271 commit8d30337

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2 files changed

+26
-26
lines changed

2 files changed

+26
-26
lines changed

‎src/backend/utils/adt/pg_lzcompress.c‎

Lines changed: 15 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -166,7 +166,7 @@
166166
*
167167
* Copyright (c) 1999-2007, PostgreSQL Global Development Group
168168
*
169-
* $PostgreSQL: pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.26 2007/04/06 04:21:43 tgl Exp $
169+
* $PostgreSQL: pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.27 2007/08/0421:53:00 tgl Exp $
170170
* ----------
171171
*/
172172
#include"postgres.h"
@@ -211,29 +211,27 @@ typedef struct PGLZ_HistEntry
211211
* ----------
212212
*/
213213
staticconstPGLZ_Strategystrategy_default_data= {
214-
256,/* Data chunks smaller 256 bytes are not
215-
* compressed */
216-
6144,/* Data chunks greater equal 6K force
217-
* compression */
218-
/* except compressed result is greater uncompressed data*/
219-
20,/* Compression rates below 20% mean fallback
220-
* to uncompressed */
221-
/* storage except compression is forced by previous parameter*/
214+
256,/* Data chunks less than 256 bytes are not
215+
* compressed */
216+
6144,/* Data chunks >= 6K force compression, unless
217+
* compressed output is larger than input */
218+
20,/* Below 6K, compression rates below 20% mean
219+
* fallback to uncompressed */
222220
128,/* Stop history lookup if a match of 128 bytes
223-
* is found*/
221+
* is found*/
224222
10/* Lower good match size by 10% at every
225-
* lookup loop iteration. */
223+
* lookup loop iteration */
226224
};
227225
constPGLZ_Strategy*constPGLZ_strategy_default=&strategy_default_data;
228226

229227

230228
staticconstPGLZ_Strategystrategy_always_data= {
231-
0,/* Chunks of any size are compressed*/
232-
0,/* */
233-
0,/*We want to saveat leastone single byte*/
229+
0,/* Chunks of any size are compressed*/
230+
0,
231+
0,/*It's enough to save one single byte*/
234232
128,/* Stop history lookup if a match of 128 bytes
235-
* is found*/
236-
6/* Look harder for a good match.*/
233+
* is found*/
234+
6/* Look harder for a good match*/
237235
};
238236
constPGLZ_Strategy*constPGLZ_strategy_always=&strategy_always_data;
239237

@@ -511,7 +509,7 @@ pglz_compress(const char *source, int32 slen, PGLZ_Header *dest,
511509
* If the strategy forbids compression (at all or if source chunk too
512510
* small), fail.
513511
*/
514-
if (strategy->match_size_good==0||
512+
if (strategy->match_size_good<=0||
515513
slen<strategy->min_input_size)
516514
return false;
517515

‎src/include/utils/pg_lzcompress.h‎

Lines changed: 11 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
*
44
*Definitions for the builtin LZ compressor
55
*
6-
* $PostgreSQL: pgsql/src/include/utils/pg_lzcompress.h,v 1.14 2007/02/27 23:48:10 tgl Exp $
6+
* $PostgreSQL: pgsql/src/include/utils/pg_lzcompress.h,v 1.15 2007/08/04 21:53:00 tgl Exp $
77
* ----------
88
*/
99

@@ -50,16 +50,18 @@ typedef struct PGLZ_Header
5050
*
5151
*min_input_sizeMinimum input data size to start compression.
5252
*
53-
*force_input_sizeInput data size at which compressed storage is
54-
*forced even if the compression rate drops below
55-
*min_comp_rate (but not below 0).
56-
*
57-
*min_comp_rateMinimum compression rate (0-99%), the output
58-
*must be smaller than the input. If that isn't
53+
*force_input_sizeMinimum input data size to force compression
54+
*even if the compression rate drops below
55+
*min_comp_rate. But in any case the output
56+
*must be smaller than the input. If that isn't
5957
*the case, the compressor will throw away its
6058
*output and copy the original, uncompressed data
6159
*to the output buffer.
6260
*
61+
*min_comp_rateMinimum compression rate (0-99%) to require for
62+
*inputs smaller than force_input_size. If not
63+
*achieved, the output will be uncompressed.
64+
*
6365
*match_size_goodThe initial GOOD match size when starting history
6466
*lookup. When looking up the history to find a
6567
*match that could be expressed as a tag, the
@@ -70,8 +72,8 @@ typedef struct PGLZ_Header
7072
*longer the lookup takes, the smaller matches
7173
*are considered good.
7274
*
73-
*match_size_dropThe percentage, match_size_good is lowered
74-
*at each history check. Allowed values are
75+
*match_size_dropThe percentage by which match_size_good is lowered
76+
*after each history check. Allowed values are
7577
*0 (no change until end) to 100 (only check
7678
*latest history entry at all).
7779
* ----------

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