+ if ($row{set} eq 'cp437') {
+ if ($row{offset} <= 0xED and $row{endpoint} >= 0xED - $row{offset}) {
+ # replace phi glyph
+ substr($row{table}, 0xED - $row{offset}, 1) = 'ϕ';
+ }
+ if ($row{offset} < 0x20) {
+ # replace control characters by visible variants
+ my $sub = substr ' ☺☻♥♦♣♠•◘○◙♂♀♪♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼', $row{offset};
+ substr($row{table}, 0, length $sub) = $sub;
+ }
+ }
+ elsif ($row{set} eq 'symbol') {
+ if ($row{offset} <= 0x60 and $row{endpoint} >= 0x60 - $row{offset}) {
+ # replace radical extender by closest unicode equivalent
+ substr($row{table}, 0x60 - $row{offset}, 1) = '│';
+ }
+ if ($row{offset} <= 0xBD and $row{endpoint} >= 0xFF - $row{offset}) {
+ substr($row{table}, 0xBD - $row{offset}, 2) = '⏐⎯'; # arrow extenders
+ substr($row{table}, 0xD2 - $row{offset}, 3) = '®©™'; # serif variants
+ substr($row{table}, 0xE0 - $row{offset}, 1) = '◊'; # replace lookalike, should match AdobeSymbol
+ substr($row{table}, 0xE2 - $row{offset}, 3) = '®©™'; # sans-serif variants
+ substr($row{table}, 0xE6 - $row{offset}, 10) = '⎛⎜⎝⎡⎢⎣⎧⎨⎩⎪';
+ substr($row{table}, 0xF0 - $row{offset}, 1) = '€';
+ substr($row{table}, 0xF4 - $row{offset}, 11) = '⎮⌡⎞⎟⎠⎤⎥⎦⎫⎬⎭';
+ }