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Commitadb371c

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Fix incorrect value for "strategy" with deflateParams() in walmethods.c
The zlib documentation mentions the values supported for the compressionstrategy, but this code has been using a hardcoded value of 0 ratherthan Z_DEFAULT_STRATEGY. This commit adjusts the code to useZ_DEFAULT_STRATEGY.Backpatch down to where this code has been added to ease the backport ofany future patch touching this area.Reported-by: Tom LaneDiscussion:https://postgr.es/m/1400032.1662217889@sss.pgh.pa.usBackpatch-through: 10
1 parent7dd9b46 commitadb371c

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1 file changed

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‎src/bin/pg_basebackup/walmethods.c

Lines changed: 6 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -706,7 +706,7 @@ tar_open_for_write(const char *pathname, const char *temp_suffix, size_t pad_to_
706706
returnNULL;
707707

708708
/* Turn off compression for header */
709-
if (deflateParams(tar_data->zp,0,0)!=Z_OK)
709+
if (deflateParams(tar_data->zp,0,Z_DEFAULT_STRATEGY)!=Z_OK)
710710
{
711711
tar_set_error("could not change compression parameters");
712712
returnNULL;
@@ -744,7 +744,8 @@ tar_open_for_write(const char *pathname, const char *temp_suffix, size_t pad_to_
744744
returnNULL;
745745

746746
/* Re-enable compression for the rest of the file */
747-
if (deflateParams(tar_data->zp,tar_data->compression,0)!=Z_OK)
747+
if (deflateParams(tar_data->zp,tar_data->compression,
748+
Z_DEFAULT_STRATEGY)!=Z_OK)
748749
{
749750
tar_set_error("could not change compression parameters");
750751
returnNULL;
@@ -958,7 +959,7 @@ tar_close(Walfile f, WalCloseMethod method)
958959
else
959960
{
960961
/* Turn off compression */
961-
if (deflateParams(tar_data->zp,0,0)!=Z_OK)
962+
if (deflateParams(tar_data->zp,0,Z_DEFAULT_STRATEGY)!=Z_OK)
962963
{
963964
tar_set_error("could not change compression parameters");
964965
return-1;
@@ -969,7 +970,8 @@ tar_close(Walfile f, WalCloseMethod method)
969970
return-1;
970971

971972
/* Turn compression back on */
972-
if (deflateParams(tar_data->zp,tar_data->compression,0)!=Z_OK)
973+
if (deflateParams(tar_data->zp,tar_data->compression,
974+
Z_DEFAULT_STRATEGY)!=Z_OK)
973975
{
974976
tar_set_error("could not change compression parameters");
975977
return-1;

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