nulib/php/src_file/base/FileReader.php

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2024-04-25 17:46:18 +04:00
<?php
namespace nulib\file\base;
/**
* Class FileReader: un fichier accédé en lecture
*/
class FileReader extends _File {
/** @var bool *à l'ouverture du fichier*, faut-il ignorer le BOM? */
const IGNORE_BOM = true;
const DEFAULT_MODE = "rb";
/** @var bool */
protected $ignoreBom;
function __construct($input, ?string $mode=null, bool $throwOnError=true, ?bool $allowLocking=null, ?bool $ignoreBom=null) {
if ($ignoreBom === null) $ignoreBom = static::IGNORE_BOM;
$this->ignoreBom = $ignoreBom;
if ($input === null) {
$fd = STDIN;
$close = false;
} elseif (is_resource($input)) {
$fd = $input;
$close = false;
} else {
$file = $input;
if ($mode === null) $mode = static::DEFAULT_MODE;
$this->file = $file;
$this->mode = $mode;
$fd = $this->open();
$close = true;
}
parent::__construct($fd, $close, $throwOnError, $allowLocking);
}
/** @return resource */
protected function open() {
$fd = parent::open();
$this->haveBom = false;
if ($this->ignoreBom) {
$bom = fread($fd, 3);
if ($bom === "\xEF\xBB\xBF") $this->seekOffset = 3;
else rewind($fd);
}
return $fd;
}
function haveBom(): bool {
return $this->seekOffset !== 0;
}
}