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62 lines
1.7 KiB
PHP
62 lines
1.7 KiB
PHP
<?php
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/*
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* binary.class.php:
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* Utility functions for dealing with binary files/strings.
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* All functions assume network byte order (big-endian).
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*
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* Copyright (C) 2008, 2009 Patrik Fimml
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*
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* This file is part of glip.
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*
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* glip is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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* glip is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with glip. If not, see <http://www.gnu.org/licenses/>.
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*/
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final class Binary
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{
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static public function uint16($str, $pos=0)
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{
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return ord($str{$pos+0}) << 8 | ord($str{$pos+1});
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}
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static public function uint32($str, $pos=0)
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{
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$a = unpack('Nx', substr($str, $pos, 4));
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return $a['x'];
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}
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static public function nuint32($n, $str, $pos=0)
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{
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$r = array();
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for ($i = 0; $i < $n; $i++, $pos += 4)
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$r[] = Binary::uint32($str, $pos);
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return $r;
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}
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static public function fuint32($f) { return Binary::uint32(fread($f, 4)); }
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static public function nfuint32($n, $f) { return Binary::nuint32($n, fread($f, 4*$n)); }
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static public function git_varint($str, &$pos=0)
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{
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$r = 0;
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$c = 0x80;
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for ($i = 0; $c & 0x80; $i += 7)
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{
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$c = ord($str{$pos++});
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$r |= (($c & 0x7F) << $i);
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}
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return $r;
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}
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}
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