<?php

/**
 * [Discuz!] (C)2001-2099 Discuz! Team
 * This is NOT a freeware, use is subject to license terms
 * https://license.discuz.vip
 */

if(!defined('IN_DISCUZ')) {
	exit('Access Denied');
}

function getimageinfoval($ImageInfo, $val_arr) {
	$InfoVal = exif_lang('unknown');
	foreach($val_arr as $name => $val) {
		if($name == $ImageInfo) {
			$InfoVal =	&$val;
			break;
		}
	}
	return $InfoVal;
}

function getexif($img) {

	$imgtype = ['', 'GIF', 'JPG', 'PNG', 'SWF', 'PSD', 'BMP', 'WEBP', 'TIFF(intel byte order)', 'TIFF(motorola byte order)', 'JPC', 'JP2', 'JPX', 'JB2', 'SWC', 'IFF', 'WBMP', 'XBM'];
	$Orientation = ['', 'top left side', 'top right side', 'bottom right side', 'bottom left side', 'left side top', 'right side top', 'right side bottom', 'left side bottom'];
	$ResolutionUnit = exif_lang('resolutionunit');
	$YCbCrPositioning = ['', 'the center of pixel array', 'the datum point'];
	$ExposureProgram = exif_lang('exposureprogram');
	$MeteringMode_arr = exif_lang('meteringmode');
	$Lightsource_arr = exif_lang('lightsource');
	$Flash_arr = [
		'0' => 'flash did not fire',
		'1' => 'flash fired',
		'5' => 'flash fired but strobe return light not detected',
		'7' => 'flash fired and strobe return light detected',
	];

	if(!function_exists('exif_read_data')) {
		return exif_lang('img_info');
	}
	$exif = @exif_read_data($img, 'IFD0');
	if($exif === false) {
		$new_img_info = exif_lang('img_info');
	} else {
		@$exif = exif_read_data($img, 0, true);
		foreach($exif as $type => $typearr) {
			foreach($typearr as $key => $kval) {
				if(is_array($kval)) {
					foreach($kval as $vkey => $value) {
						$str = dhtmlspecialchars(preg_replace('/[^\[A-Za-z0-9_\.\/:\s-\]]/', '', trim($value)));
						$exif[$type][$key][$vkey] = $str;
					}
				} elseif(!in_array($key, ['ComponentsConfiguration', 'FileSource', 'SceneType'])) {
					$str = dhtmlspecialchars(preg_replace('/[^\[A-Za-z0-9_\.\/:\s-\]]/', '', trim($kval)));
					$exif[$type][$key] = $str;
				}
			}
		}
		$new_img_info = [
			exif_lang('FileName') => $exif['FILE']['FileName'],
			exif_lang('FileType') => $imgtype[$exif['FILE']['FileType']],
			exif_lang('MimeType') => $exif['FILE']['MimeType'],
			exif_lang('FileSize') => $exif['FILE']['FileSize'],
			exif_lang('FileDateTime') => empty($exif['FILE']['FileDateTime']) ? '' : date('Y-m-d H:i:s', $exif['FILE']['FileDateTime']),
			exif_lang('ImageDescription') => $exif['IFD0']['ImageDescription'],
			exif_lang('Make') => $exif['IFD0']['Make'],
			exif_lang('Model') => $exif['IFD0']['Model'],
			exif_lang('Orientation') => $Orientation[$exif['IFD0']['Orientation']],
			exif_lang('XResolution') => $exif['IFD0']['XResolution'].$ResolutionUnit[$exif['IFD0']['ResolutionUnit']],
			exif_lang('YResolution') => $exif['IFD0']['YResolution'].$ResolutionUnit[$exif['IFD0']['ResolutionUnit']],
			exif_lang('Software') => $exif['IFD0']['Software'],
			exif_lang('DateTime') => $exif['IFD0']['DateTime'],
			exif_lang('Artist') => $exif['IFD0']['Artist'],
			exif_lang('YCbCrPositioning') => $YCbCrPositioning[$exif['IFD0']['YCbCrPositioning']],
			exif_lang('Copyright') => $exif['IFD0']['Copyright'],
			exif_lang('Photographer') => $exif['COMPUTED']['Copyright.Photographer'],
			exif_lang('Editor') => $exif['COMPUTED']['Copyright.Editor'],
			exif_lang('ExifVersion') => $exif['EXIF']['ExifVersion'],
			exif_lang('FlashPixVersion') => 'Ver. '.number_format(dintval($exif['EXIF']['FlashPixVersion']) / 100, 2),
			exif_lang('DateTimeOriginal') => $exif['EXIF']['DateTimeOriginal'],
			exif_lang('DateTimeDigitized') => $exif['EXIF']['DateTimeDigitized'],
			exif_lang('Height') => $exif['COMPUTED']['Height'],
			exif_lang('Width') => $exif['COMPUTED']['Width'],
			exif_lang('ApertureValue') => $exif['EXIF']['ApertureValue'],
			exif_lang('ShutterSpeedValue') => $exif['EXIF']['ShutterSpeedValue'],
			exif_lang('ApertureFNumber') => $exif['COMPUTED']['ApertureFNumber'],
			exif_lang('MaxApertureValue') => 'F'.$exif['EXIF']['MaxApertureValue'],
			exif_lang('ExposureTime') => $exif['EXIF']['ExposureTime'],
			exif_lang('FNumber') => $exif['EXIF']['FNumber'],
			exif_lang('MeteringMode') => getimageinfoval($exif['EXIF']['MeteringMode'], $MeteringMode_arr),
			exif_lang('LightSource') => getimageinfoval($exif['EXIF']['LightSource'], $Lightsource_arr),
			exif_lang('Flash') => getimageinfoval($exif['EXIF']['Flash'], $Flash_arr),
			exif_lang('ExposureMode') => ($exif['EXIF']['ExposureMode'] == 1 ? exif_lang('manual') : exif_lang('auto')),
			exif_lang('WhiteBalance') => ($exif['EXIF']['WhiteBalance'] == 1 ? exif_lang('manual') : exif_lang('auto')),
			exif_lang('ExposureProgram') => $ExposureProgram[$exif['EXIF']['ExposureProgram']],
			exif_lang('ExposureBiasValue') => $exif['EXIF']['ExposureBiasValue'].'EV',
			exif_lang('ISOSpeedRatings') => $exif['EXIF']['ISOSpeedRatings'],
			exif_lang('ComponentsConfiguration') => (bin2hex($exif['EXIF']['ComponentsConfiguration']) == '01020300' ? 'YCbCr' : 'RGB'),
			exif_lang('CompressedBitsPerPixel') => $exif['EXIF']['CompressedBitsPerPixel'].'Bits/Pixel',
			exif_lang('FocusDistance') => $exif['COMPUTED']['FocusDistance'].'m',
			exif_lang('FocalLength') => $exif['EXIF']['FocalLength'].'mm',
			exif_lang('FocalLengthIn35mmFilm') => $exif['EXIF']['FocalLengthIn35mmFilm'].'mm',
			exif_lang('UserCommentEncoding') => $exif['COMPUTED']['UserCommentEncoding'],
			exif_lang('UserComment') => $exif['COMPUTED']['UserComment'],
			exif_lang('ColorSpace') => ($exif['EXIF']['ColorSpace'] == 1 ? 'sRGB' : 'Uncalibrated'),
			exif_lang('ExifImageLength') => $exif['EXIF']['ExifImageLength'],
			exif_lang('ExifImageWidth') => $exif['EXIF']['ExifImageWidth'],
			exif_lang('FileSource') => (bin2hex($exif['EXIF']['FileSource']) == 0x03 ? 'digital still camera' : 'unknown'),
			exif_lang('SceneType') => (bin2hex($exif['EXIF']['SceneType']) == 0x01 ? 'A directly photographed image' : 'unknown'),
			exif_lang('ThumbFileType') => $exif['COMPUTED']['Thumbnail.FileType'],
			exif_lang('ThumbMimeType') => $exif['COMPUTED']['Thumbnail.MimeType']
		];
	}
	return $new_img_info;
}

function exif_lang($langkey) {
	return lang('exif', $langkey);
}