melder/vendor/Shapefile/File/StreamResourceFile.php
Walter Hupfeld 4bef36aa6b shapefile
2024-03-16 17:33:46 +01:00

144 lines
3.6 KiB
PHP

<?php
/**
* PHP Shapefile - PHP library to read and write ESRI Shapefiles, compatible with WKT and GeoJSON
*
* @package Shapefile
* @author Gaspare Sganga
* @version 4.0.0dev
* @license MIT
* @link https://gasparesganga.com/labs/php-shapefile/
*/
namespace Shapefile\File;
use Shapefile\Shapefile;
use Shapefile\ShapefileException;
/**
* Default FileInterface implementation.
* It allows reading/writing of files in binary mode.
* It accepts both filepaths and stream resource handles.
*/
class StreamResourceFile implements FileInterface
{
/////////////////////////////// PRIVATE VARIABLES ///////////////////////////////
/**
* @var resource File resource handle.
*/
private $handle = null;
/**
* @var bool Flag to store whether file was passed as resource handle or not.
*/
private $flag_resource = false;
/////////////////////////////// PUBLIC ///////////////////////////////
/**
* Constructor.
* Opens file with binary read or write access.
*
* @param string|resource $file Path to file or resource handle.
* @param bool $write_access Access type: false = read; true = write.
*/
public function __construct($file, $write_access)
{
$this->flag_resource = is_resource($file);
if ($this->flag_resource) {
$this->handle = $file;
if (get_resource_type($this->handle) !== 'stream' || !stream_get_meta_data($this->handle)['seekable']) {
throw new ShapefileException(Shapefile::ERR_FILE_RESOURCE_NOT_VALID);
}
if ((!$write_access && !$this->isReadable()) || ($write_access && !$this->isWritable())) {
throw new ShapefileException(Shapefile::ERR_FILE_PERMISSIONS);
}
} else {
$this->handle = @fopen($file, $write_access ? 'c+b' : 'rb');
if ($this->handle === false) {
throw new ShapefileException(Shapefile::ERR_FILE_OPEN);
}
}
}
/**
* Destructor.
*
* Closes file if it was NOT passed as resource handle.
*/
public function __destruct()
{
if (!$this->flag_resource) {
fclose($this->handle);
}
}
/**
* Gets canonicalized absolute pathname.
*/
public function getFilepath()
{
return realpath(stream_get_meta_data($this->handle)['uri']);
}
public function isReadable()
{
return in_array(stream_get_meta_data($this->handle)['mode'], ['rb', 'r+b', 'w+b', 'x+b', 'c+b']);
}
public function isWritable()
{
return in_array(stream_get_meta_data($this->handle)['mode'], ['r+b', 'wb', 'w+b', 'xb', 'x+b', 'cb', 'c+b']);
}
public function truncate($size)
{
ftruncate($this->handle, $size);
}
public function getSize()
{
return fstat($this->handle)['size'];
}
public function getPointer()
{
return ftell($this->handle);
}
public function setPointer($position)
{
fseek($this->handle, $position, SEEK_SET);
}
public function resetPointer()
{
fseek($this->handle, 0, SEEK_END);
}
public function setOffset($offset)
{
fseek($this->handle, $offset, SEEK_CUR);
}
public function read($length)
{
return @fread($this->handle, $length);
}
public function write($data)
{
if (@fwrite($this->handle, $data) === false) {
return false;
}
return true;
}
}