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Add smallHash() function

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There should no longer be any collision on hashed links.

Stolen from shaarli:

9cf93bcfc5/application/Utils.php (L44)
This commit is contained in:
pips 2016-12-13 13:17:37 +01:00
parent 1327eba46a
commit 2d7658c871
1 changed files with 10 additions and 8 deletions
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18
index.php
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@ -1,4 +1,12 @@
<?php
function smallHash($text)
{
$t = rtrim(base64_encode(hash('crc32', $text, true)), '=');
return strtr($t, '+/', '-_');
}
if (!empty($_GET['url'])) {
$url = $_GET['url'];
@ -6,7 +14,7 @@ if (!empty($_GET['url'])) {
$url = 'http://'.$url;
}
$urlhash = sha1($url);
$urlhash = smallHash($url);
$hashfolder = substr($urlhash, 0, 2);
$hashfile = substr($urlhash, 2);
@ -17,8 +25,7 @@ if (!empty($_GET['url'])) {
mkdir($hashfolderpath, 0700, true);
file_put_contents($hashfilepath, $url);
$content = '<a href="./?'.$urlhash.'">./?'.$urlhash.'</a><br />
As long as there is not collision, you can shorten it down to 3 characters.';
$content = '<a href="./?'.$urlhash.'">./?'.$urlhash.'</a>';
} elseif (!empty($_GET)) {
$urlhash = key($_GET);
@ -34,11 +41,6 @@ if (!empty($_GET['url'])) {
$content = 'No files.';
return 1;
} elseif (count($findfiles) > 1) {
foreach ($findfiles as $file) {
$file = str_replace('/', '', substr($file, 5));
$content = '<a href="./?'.$file.'">./?'.$file.'</a><br />';
}
}
$fullfilepath = current($findfiles);