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FU/Util.pm  view on Meta::CPAN

=back


=head1 Gzip Compression

Gzip compression can be done with a few different libraries. The canonical one
is I<zlib>, which is old and not well optimized for modern systems. There's
also I<zlib-ng>, a (much) more performant reimplementation that remains
API-compatible with I<zlib>. And there's I<libdeflate>, which offers a
different API that does not support streaming compression but is, in exchange,
even faster than I<zlib-ng>.

There are more implementations, of course, but this module only supports those
three and (attempts to) pick the best one that's available on your system.

=over

=item gzip_lib()

Returns an empty string if no supported gzip library was found on your system

FU/Util.pm  view on Meta::CPAN

compression). Only I<libdeflate> supports levels higher than 9, for
I<zlib(-ng)> the level is capped at 9. 6 is typically used as a default.

Throws an error if no suitable library was found.

This function is B<NOT> safe to use from multiple threads!

=back

This module does not currently implement decompression. If you need that, or
streaming, or other functionality not provided here, there's
L<Compress::Raw::Zlib> and L<Compress::Zlib> in the core Perl distribution and
L<Gzip::Faster>, L<Gzip::Zopfli> and L<Gzip::Libdeflate> on CPAN.


=head1 Brotli Compression

Just a small wrapper around C<libbrotlienc.so>'s one-shot compression
interface.

=over

c/pgst.c  view on Meta::CPAN

        if (st->param_values[i]) {
            st->param_values[i] = buf->cur + off;
            off += st->param_lengths[i];
        }
    }
}

static void fupg_st_execute(pTHX_ fupg_st *st) {
    /* Disallow fetching the results more than once. I don't see a reason why
     * someone would need that and disallowing it leaves room for fetching the
     * results in a streaming fashion without breaking API compat. */
    if (st->result) fu_confess("Invalid attempt to execute statement multiple times");

    /* Whether we can do a direct call or need to prepare first */
    int direct = !st->describe && (st->nbind == 0 || st->stflags & FUPG_TEXT_PARAMS) && !(st->stflags & FUPG_CACHE);
    if (!direct) {
        fupg_st_prepare(aTHX_ st);
        if (PQnparams(st->describe) != st->nbind)
            fu_confess("Statement expects %d bind parameters but %d were given", PQnparams(st->describe), st->nbind);
    }
    int refresh_done = 0;