Re: Fix detection of truncated zstd-compressed backups

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Hi Chao,

Thanks for updating the patch.

Date: Thu, 13 Aug 2026 11:32:59 +0800

On Thu, 13 Aug 2026 at 09:47, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> wrote:
>> On Aug 13, 2026, at 05:56, Zsolt Parragi <zsolt(dot)parragi(at)percona(dot)com> wrote:
>>
>> I have two minor comment for v5, otherwise it looks good to me:
>
> Hi Zsolt,
>
> Thanks a lot for reviewing.
>
>>
>> +typedef enum
>> +{
>> + STREAM_NEW,
>> + STREAM_HAS_DATA,
>> + STREAM_FINISHED,
>> +} pg_stream_state;
>> +
>>
>> This is duplicated in two files, wouldn't be astreamer.h a better place for it?
>
> I think this makes sense. Plus your second comment, this enum can be shared by all 3 astreamers. I moved it to astreamer.h and renamed it to astreamer_decompression_state.
>

The astreamer_decompression_state should be added to pgindent's typedefs.list.

>>
>> + if (!mystreamer->stream_finished)
>> + pg_fatal("could not decompress data: compressed stream is incomplete");
>> +
>>
>> The other two checks distinguish empty from incomplete, is this
>> difference intended?
>
> I do not think that is intentional. My initial implementation did not
> check for an empty stream, and gzip uses a different pattern from zstd
> and LZ4, which is probably why Daniel initially added the empty-stream
> check only to zstd and lz4.
>
> I have now added the same check to gzip so that all three astreamers are consistent.
>
> PFA v6: addressed Zsolt’s comments.
>
> Best regards,
> --
> Chao Li (Evan)
> HighGo Software Co., Ltd.
> https://www.highgo.com/

--
Regards,
Japin Li
ChengDu WenWu Information Technology Co., Ltd.