On 07/25/2015 01:52 PM, I wrote:
I propose to tighten pg_dump's rules so that only 0..9 are accepted as
arguments for -Z, and in compress_io.c:cfopen(), if compression is
equal to Z_DEFAULT_COMPRESSION, not add any explicit compression value
to the mode, thus using the zlib default.
As per attached patch.
Comments?
cheers
andrew
diff --git a/src/bin/pg_dump/compress_io.c b/src/bin/pg_dump/compress_io.c
index 912fc2f..6e1469b 100644
--- a/src/bin/pg_dump/compress_io.c
+++ b/src/bin/pg_dump/compress_io.c
@@ -547,11 +547,21 @@ cfopen(const char *path, const char *mode, int compression)
if (compression != 0)
{
#ifdef HAVE_LIBZ
- char mode_compression[32];
+ if (compression != Z_DEFAULT_COMPRESSION)
+ {
+ /* user has specified a compression level, so tell zlib to use it */
+ char mode_compression[32];
+
+ snprintf(mode_compression, sizeof(mode_compression), "%s%d",
+ mode, compression);
+ fp->compressedfp = gzopen(path, mode_compression);
+ }
+ else
+ {
+ /* don't specify a level, just use the zlib default */
+ fp->compressedfp = gzopen(path, mode);
+ }
- snprintf(mode_compression, sizeof(mode_compression), "%s%d",
- mode, compression);
- fp->compressedfp = gzopen(path, mode_compression);
fp->uncompressedfp = NULL;
if (fp->compressedfp == NULL)
{
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0e036b8..b24b8bd 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -485,6 +485,11 @@ main(int argc, char **argv)
case 'Z': /* Compression Level */
compressLevel = atoi(optarg);
+ if (compressLevel < 0 || compressLevel > 9)
+ {
+ write_msg(NULL, "compression level must be in range 0..9\n");
+ exit_nicely(1);
+ }
break;
case 0:
--
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