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<?php function pack_encode($format, $val) { $b64 = base64_encode(pack($format, $val)); return str_replace(array('/', '='), array('_', ''), $b64); // "/" json-encodes poorly and "=" is padding } function pack_decode($format, $val) { $b64 = str_replace('_', '/', $val); // un-padded $bytes = unpack($format, base64_decode($b64, false)); return print_r($bytes, false); //return "foo"; // return $hi << 8 | $lo; } function pack_encode_uint16($val) { return pack_encode('n', $val); } function pack_encode_uint32($val) { return pack_encode('N', $val); } function pack_decode_uint16($val) { return pack_decode('n', $val); } function pack_decode_uint32($val) { return pack_decode('N', $val); } $max = 32767; $n = 20; $step = intval($max/$n); for ($i=0; $i<=$n; $i++) { $val = $i*$step; $enc16 = pack_encode_uint16($val); $enc32 = pack_encode_uint32($val); $str = base64_encode(strval($val)); // STUPID echo "$enc16 $enc32 $str $val"; $dec16 = pack_decode_uint16($enc16); $dec32 = pack_decode_uint32($enc32); if ($dec16 != $val) { echo " $dec16 != $val"; } else if ($dec32 != $val) { echo " $dec32 != $val"; } echo "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
AAA AAAAAA MA== 0Array ( [1] => 0 ) Array ( [1] => 0 ) 1 != 0 BmY AAAGZg MTYzOA== 1638Array ( [1] => 1638 ) Array ( [1] => 1638 ) DMw AAAMzA MzI3Ng== 3276Array ( [1] => 3276 ) Array ( [1] => 3276 ) EzI AAATMg NDkxNA== 4914Array ( [1] => 4914 ) Array ( [1] => 4914 ) GZg AAAZmA NjU1Mg== 6552Array ( [1] => 6552 ) Array ( [1] => 6552 ) H_4 AAAf_g ODE5MA== 8190Array ( [1] => 8190 ) Array ( [1] => 8190 ) JmQ AAAmZA OTgyOA== 9828Array ( [1] => 9828 ) Array ( [1] => 9828 ) LMo AAAsyg MTE0NjY= 11466Array ( [1] => 11466 ) Array ( [1] => 11466 ) MzA AAAzMA MTMxMDQ= 13104Array ( [1] => 13104 ) Array ( [1] => 13104 ) OZY AAA5lg MTQ3NDI= 14742Array ( [1] => 14742 ) Array ( [1] => 14742 ) P_w AAA__A MTYzODA= 16380Array ( [1] => 16380 ) Array ( [1] => 16380 ) RmI AABGYg MTgwMTg= 18018Array ( [1] => 18018 ) Array ( [1] => 18018 ) TMg AABMyA MTk2NTY= 19656Array ( [1] => 19656 ) Array ( [1] => 19656 ) Uy4 AABTLg MjEyOTQ= 21294Array ( [1] => 21294 ) Array ( [1] => 21294 ) WZQ AABZlA MjI5MzI= 22932Array ( [1] => 22932 ) Array ( [1] => 22932 ) X_o AABf+g MjQ1NzA= 24570Array ( [1] => 24570 ) Array ( [1] => 24570 ) ZmA AABmYA MjYyMDg= 26208Array ( [1] => 26208 ) Array ( [1] => 26208 ) bMY AABsxg Mjc4NDY= 27846Array ( [1] => 27846 ) Array ( [1] => 27846 ) cyw AABzLA Mjk0ODQ= 29484Array ( [1] => 29484 ) Array ( [1] => 29484 ) eZI AAB5kg MzExMjI= 31122Array ( [1] => 31122 ) Array ( [1] => 31122 ) f_g AAB_+A MzI3NjA= 32760Array ( [1] => 32760 ) Array ( [1] => 32760 )

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