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pg_dump expects a read request of zero bytes to be a no-op; see for example ReadStr(). Gzip_read got this wrong and falsely supposed that the resulting gzret == 0 indicated an error. We could complicate that error-checking logic some more, but it seems best to just fall out immediately when passed size == 0. This bug breaks the nominally-supported case of manually gzip'ing the toc.dat file within a directory-style dump, so back-patch to v16 where this code came in. (Prior branches already have a short-circuit for size == 0 before their only gzread call.) Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/3515357.1760128017@sss.pgh.pa.us Backpatch-through: 16
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/.