<?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, $width, $bin) {
$b64 = str_replace('_', '/', $bin); // un-padded
$data = array();//unpack($format, base64_decode($b64, false));
$val = 0;
foreach ($data as $v) {
$val = ($val<<$width) | $v;
}
return $val;
}
function pack_encode_uint16($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', 16, $val);
}
function pack_decode_uint32($val) {
return pack_decode('N', 32, $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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- AAA AAAAAA MA== 0
BmY AAAGZg MTYzOA== 1638 0 != 1638
DMw AAAMzA MzI3Ng== 3276 0 != 3276
EzI AAATMg NDkxNA== 4914 0 != 4914
GZg AAAZmA NjU1Mg== 6552 0 != 6552
H_4 AAAf_g ODE5MA== 8190 0 != 8190
JmQ AAAmZA OTgyOA== 9828 0 != 9828
LMo AAAsyg MTE0NjY= 11466 0 != 11466
MzA AAAzMA MTMxMDQ= 13104 0 != 13104
OZY AAA5lg MTQ3NDI= 14742 0 != 14742
P_w AAA__A MTYzODA= 16380 0 != 16380
RmI AABGYg MTgwMTg= 18018 0 != 18018
TMg AABMyA MTk2NTY= 19656 0 != 19656
Uy4 AABTLg MjEyOTQ= 21294 0 != 21294
WZQ AABZlA MjI5MzI= 22932 0 != 22932
X_o AABf+g MjQ1NzA= 24570 0 != 24570
ZmA AABmYA MjYyMDg= 26208 0 != 26208
bMY AABsxg Mjc4NDY= 27846 0 != 27846
cyw AABzLA Mjk0ODQ= 29484 0 != 29484
eZI AAB5kg MzExMjI= 31122 0 != 31122
f_g AAB_+A MzI3NjA= 32760 0 != 32760
preferences:
222.52 ms | 407 KiB | 327 Q