Re: PQescapeBytea is not multibyte aware

Tom Lane wrote:
> Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
>
>>PQescapebytea() is not multibyte aware and will produce bad multibyte
>>character sequences. Example:
>>I think 0x89 should be converted to '\\211' since 0x89 of 0x8950 is
>>considered as "non printable characters".
>
>
> Hmm, so essentially we'd have to convert all codes >= 0x80 to prevent
> them from being mistaken for parts of multibyte sequences? Ugh, but
> you're probably right. It looks to me like byteaout does the reverse
> already.
>

But the error comes from pg_verifymbstr. Since bytea has no encoding
(it's just an array of bytes afterall), why does pg_verifymbstr get
applied at all to bytea data?

pg_verifymbstr is called by textin, bpcharin, and varcharin. Would it
help to rewrite this as:

INSERT INTO t1(bytea_col) VALUES('characters produced by
PQescapebytea'::bytea);
?

Joe