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The EDK II C Coding Standards Specification (v2.20) strongly discourages variable declarations in nested block scope: 5 Source Files 5.4 Code File Structure 5.4.1 Scoping Rules 5.4.1.1 Scope > Block (local) Scope > > [...] > > Data declarations may follow the opening brace of a compound statement, > regardless of nesting depth, and before any code generating statements > have been entered. Other than at the outermost block of a function body, > this type of declaration is strongly discouraged. Hoist such variable declarations in Base64Decode() to the outermost function scope. Cc: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Cc: Zhichao Gao <zhichao.gao@intel.com> Fixes: 35e242b698cdc6205e99a6d6a188bf27fecf9fb4 Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1980 Reported-by: Zhichao Gao <zhichao.gao@intel.com> Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Rebecca Cran <rebecca@bsdio.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Tested-by: Philippe Mathieu-Daude <philmd@redhat.com>