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The bounds hardcoded in compression.c since ffd5365 (minimum at 1 and maximum at 22) do not match the reality of what zstd is able to handle, these values being available via ZSTD_maxCLevel() and ZSTD_minCLevel() at run-time. The maximum of 22 is actually correct in recent versions, but the minimum was not as the library can go down to -131720 by design. This commit changes the code to use the run-time values in the code instead of some hardcoded ones. Zstd seems to assume that these bounds could change in the future, and Postgres will be able to adapt automatically to such changes thanks to what's being done in this commit. Reported-by: Justin Prysby Discussion: https://postgr.es/m/20220922033716.GL31833@telsasoft.com Backpatch-through: 15
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.