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LargeFileContent.php
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LargeFileContent.php
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<?php
/**
* This file is part of vfsStream.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @package org\bovigo\vfs
*/
namespace org\bovigo\vfs\content;
/**
* File content implementation to mock large files.
*
* When content is written via write() the data will be written into the
* positions according to the current offset.
* When content is read via read() it will use the already written data. If no
* data is written at the offsets to read those offsets will be filled with
* spaces.
* Please note that accessing the whole content via content() will deliver a
* string with the length of the originally defined size. It is not advisable to
* do so with large sizes, except you have enough memory and time. :-)
*
* @since 1.3.0
*/
class LargeFileContent extends SeekableFileContent implements FileContent
{
/**
* byte array of written content
*
* @type char[]
*/
private $content = array();
/**
* file size in bytes
*
* @type int
*/
private $size;
/**
* constructor
*
* @param int $size file size in bytes
*/
public function __construct($size)
{
$this->size = $size;
}
/**
* create large file with given size in kilobyte
*
* @param int $kilobyte
* @return LargeFileContent
*/
public static function withKilobytes(int $kilobyte): self
{
return new self($kilobyte * 1024);
}
/**
* create large file with given size in megabyte
*
* @param int $megabyte
* @return LargeFileContent
*/
public static function withMegabytes(int $megabyte): self
{
return self::withKilobytes($megabyte * 1024);
}
/**
* create large file with given size in gigabyte
*
* @param int $gigabyte
* @return LargeFileContent
*/
public static function withGigabytes(int $gigabyte): self
{
return self::withMegabytes($gigabyte * 1024);
}
/**
* returns actual content
*
* @return string
*/
public function content(): string
{
return $this->doRead(0, $this->size);
}
/**
* returns size of content
*
* @return int
*/
public function size(): int
{
return $this->size;
}
/**
* actual reading of given byte count starting at given offset
*
* @param int $offset
* @param int $count
* @return string
*/
protected function doRead(int $offset, int $count): string
{
if (($offset + $count) > $this->size) {
$count = $this->size - $offset;
}
$result = '';
for ($i = 0; $i < $count; $i++) {
if (isset($this->content[$i + $offset])) {
$result .= $this->content[$i + $offset];
} else {
$result .= ' ';
}
}
return $result;
}
/**
* actual writing of data with specified length at given offset
*
* @param string $data
* @param int $offset
* @param int $length
*/
protected function doWrite(string $data, int $offset, int $length)
{
for ($i = 0; $i < $length; $i++) {
$this->content[$i + $offset] = $data{$i};
}
if ($offset >= $this->size) {
$this->size += $length;
} elseif (($offset + $length) > $this->size) {
$this->size = $offset + $length;
}
}
/**
* Truncates a file to a given length
*
* @param int $size length to truncate file to
* @return bool
*/
public function truncate(int $size): bool
{
$this->size = $size;
foreach (array_filter(array_keys($this->content),
function($pos) use ($size)
{
return $pos >= $size;
}
) as $removePos) {
unset($this->content[$removePos]);
}
return true;
}
}