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bcd3eec44a
Make data_file.c's generator output its array initialization "by list of strings", instead of "by list of chars": that makes the compiler happier. Use strtr() with a precomputed map, instead of a loop over ord(), to generate in 1/100th the time. Avoids ambiguous 0x tokens (as specified in C standards), by using octal. Closes GH-10422.
47 lines
2.1 KiB
PHP
Executable file
47 lines
2.1 KiB
PHP
Executable file
#!/usr/bin/env php
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/* This is a generated file, do not modify */
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/* Usage: php create_data_file.php /path/to/magic.mgc > data_file.c */
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<?php
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/*--- Initialization of our translation table ---*/
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// By default, everything gets mapped to its \o notation
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// (not \x, because by C's norm, \x eats as many chars as possible, while \o stops at exactly 3;
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// thus \x0ABACK_2_MALICE is interpreted as hex \x0ABAC (which overflows) followed by string K_2_MALICE,
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// while \o0120 is unambiguously a CR followed by digit 0).
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for ($i = 0; $i < 0x100; ++$i) {
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$map[chr($i)] = sprintf('\%03o', $i);
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}
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// \0 is a shortcut for \x00; as the majority of the input file is \0's,
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// we divide the generated file's size by nearly 2 (30 MB -> 16 MB).
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$map[chr(0)] = '\0';
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$map["\n"] = '\n';
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// Displayable ASCII can be output as is: strings for file types will appear readable.
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for ($i = ord(' '); $i < 0x7F; ++$i) {
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$map[chr($i)] = chr($i);
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}
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// … Except digits following a \0: \012 will be interpreted as octal 012, and not \0 followed by 12.
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// Then we have to express \0 in a full unambiguous 3-chars octal code.
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for ($i = ord('0'); $i <= ord('9'); ++$i) {
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$map[chr(0).chr($i)] = '\000'.chr($i);
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}
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// … Except " and \ because we enclose the result into quotes and escape with \.
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$map['"'] = '\"';
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$map['\\'] = '\\\\';
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/*--- File generation ---*/
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// https://github.com/php/php-src/pull/10422
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// Some compilers (GCC, clang) do not like long lists; some (MSVC) do not like long strings.
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// CHUNK_SIZE splitting our ~10 MB binary source should give a good compromise between both.
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const CHUNK_SIZE = 1024;
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$dta = file_get_contents( $argv[1] );
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$chunks = str_split($dta, CHUNK_SIZE);
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$chunks[count($chunks) - 1] = str_pad($chunks[count($chunks) - 1], CHUNK_SIZE, chr(0));
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echo 'const unsigned char php_magic_database[' . count($chunks) . '][' . CHUNK_SIZE . "] = {\n";
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foreach ($chunks as $chunk) {
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echo '"' . strtr($chunk, $map) . '",' . "\n";
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}
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echo "};\n";
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?>
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