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57 lines
2.1 KiB
PHP
57 lines
2.1 KiB
PHP
<?php
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namespace Zotlabs\Lib;
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/*
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* Zotlabs\Lib\Hashpath
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*
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* Creates hashed directory structures for fast access and resistance to overloading any single directory with files.
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*
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* Takes a $url which could be any string
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* a $prefix which is where to place the hash directory in the filesystem, default is current directory
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* use an empty string for $prefix to place hash directories directly off the root directory
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* an optional $depth to indicate the hash level
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* $depth = 1, 256 directories, suitable for < 384K records/files
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* $depth = 2, 65536 directories, suitable for < 98M records/files
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* $depth = 3, 16777216 directories, suitable for < 2.5B records/files
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* ...
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* The total number of records anticipated divided by the number of hash directories should generally be kept to
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* less than 1500 entries for optimum performance though this varies by operating system and filesystem type.
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* ext4 uses 32 bit inode numbers (~4B record limit) so use caution or alternative filesystem types with $depth above 3.
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* an optional $mkdir (boolean) to recursively create the directory (ignoring errors) before returning
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*
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* examples: for a $url of 'abcdefg' and prefix of 'path' the following paths are returned for $depth = 1 and $depth = 3
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* path/7d/7d1a54127b222502f5b79b5fb0803061152a44f92b37e23c6527baf665d4da9a
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* path/7d/1a/54/7d1a54127b222502f5b79b5fb0803061152a44f92b37e23c6527baf665d4da9a
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*
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* see also: boot.php:os_mkdir() - here we provide the equivalent of mkdir -p with permissions of 770.
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*
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*/
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class Hashpath
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{
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public static function path($url, $prefix = '.', $depth = 1, $mkdir = true)
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{
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$hash = hash('sha256', $url);
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$start = 0;
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$slice = 2;
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if ($depth < 1) {
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$depth = 1;
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}
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$sluglen = $depth * $slice;
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do {
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$slug = substr($hash, $start, $slice);
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$prefix .= '/' . $slug;
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$start += $slice;
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$sluglen -= $slice;
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} while ($sluglen);
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if ($mkdir) {
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os_mkdir($prefix, STORAGE_DEFAULT_PERMISSIONS, true);
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}
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return $prefix . '/' . $hash;
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}
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}
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