| #!/usr/bin/env php | |
| /* This is a generated file, do not modify */ | |
| /* Usage: php create_data_file.php /path/to/magic.mgc > data_file.c */ | |
| /*--- Initialization of our translation table ---*/ | |
| // By default, everything gets mapped to its \o notation | |
| // (not \x, because by C's norm, \x eats as many chars as possible, while \o stops at exactly 3; | |
| // thus \x0ABACK_2_MALICE is interpreted as hex \x0ABAC (which overflows) followed by string K_2_MALICE, | |
| // while \o0120 is unambiguously a CR followed by digit 0). | |
| for ($i = 0; $i < 0x100; ++$i) { | |
| $map[chr($i)] = sprintf('\%03o', $i); | |
| } | |
| // \0 is a shortcut for \x00; as the majority of the input file is \0's, | |
| // we divide the generated file's size by nearly 2 (30 MB -> 16 MB). | |
| $map[chr(0)] = '\0'; | |
| $map["\n"] = '\n'; | |
| // Displayable ASCII can be output as is: strings for file types will appear readable. | |
| for ($i = ord(' '); $i < 0x7F; ++$i) { | |
| $map[chr($i)] = chr($i); | |
| } | |
| // … Except trigraphs | |
| $map["?"] = '\?'; | |
| // … Except digits following a \0: \012 will be interpreted as octal 012, and not \0 followed by 12. | |
| // Then we have to express \0 in a full unambiguous 3-chars octal code. | |
| for ($i = ord('0'); $i <= ord('9'); ++$i) { | |
| $map[chr(0).chr($i)] = '\000'.chr($i); | |
| } | |
| // … Except " and \ because we enclose the result into quotes and escape with \. | |
| $map['"'] = '\"'; | |
| $map['\\'] = '\\\\'; | |
| /*--- File generation ---*/ | |
| // https://github.com/php/php-src/pull/10422 | |
| // Some compilers (GCC, clang) do not like long lists; some (MSVC) do not like long strings. | |
| // CHUNK_SIZE splitting our ~10 MB binary source should give a good compromise between both. | |
| const CHUNK_SIZE = 1024; | |
| $dta = file_get_contents( $argv[1] ); | |
| $chunks = str_split($dta, CHUNK_SIZE); | |
| $chunks[count($chunks) - 1] = str_pad($chunks[count($chunks) - 1], CHUNK_SIZE, chr(0)); | |
| echo 'const unsigned char php_magic_database[' . count($chunks) . '][' . CHUNK_SIZE . "] ZEND_NONSTRING = {\n"; | |
| foreach ($chunks as $chunk) { | |
| echo '"' . strtr($chunk, $map) . '",' . "\n"; | |
| } | |
| echo "};\n"; | |