Bug #73004 [Com]: PHP 5.6 Doesn't Read EXIF Location

From: Date: Sun, 16 Oct 2016 04:59:02 +0000
Subject: Bug #73004 [Com]: PHP 5.6 Doesn't Read EXIF Location
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-204822@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=73004&edit=1

 ID:                 73004
 Comment by:         alex at twbsd dot org
 Reported by:        tom_kincaid at hotmail dot com
 Summary:            PHP 5.6 Doesn't Read EXIF Location
 Status:             Open
 Type:               Bug
 Package:            EXIF related
 Operating System:   Centos 7
 PHP Version:        5.6.25
 Block user comment: N
 Private report:     N

 New Comment:

Started from 5.6.24, exif can't read GPS location any more. It worked at 5.6.23.
But I tested 5.6.24~5.6.27 and 7.0.12 all won't work.


Test code:

#!/usr/local/bin/php
<?php
$e = exif_read_data("IMG_4017.JPG", 0,true,false);
var_dump($e['GPS']);


Remove the following code in exif.c, the GPS info can be read again:
=====
if (offset_diff < 0 || offset_diff >= value_len ) {
				exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING,
"IFD data bad offset: 0x%04X length 0x%04X", offset_diff, value_len);
				return FALSE;
			}
=====


Previous Comments:
------------------------------------------------------------------------
[2016-09-14 21:23:01] dotpointer at gmail dot com

I'm running Debian 8.5 and the Debian (apt-get) supplied version: PHP 5.6.24-0+deb8u1.

I have also this bug - exif_read_data() has stopped outputting GPS tags in my case.

I guess it has todo with the security fix recently applied, noted here:
http://stackoverflow.com/questions/38772471/php-exif-read-data-no-longer-extracts-gps-location

I understand that security fixes are crucial, but don't know how this regression in
functionality could have reached production level as I'm running an updated standard Debian
installation and not testing. 

GPS reading implementations in PHP are probably breaking all around the planet right now. I hope
this will be fixed soon for 5.6+ too.

------------------------------------------------------------------------
[2016-09-02 14:10:35] tom_kincaid at hotmail dot com

Description:
------------
exif_read_data on 5.6 doesn't read the EXIF location data. This data is in the photo, but
doesn't appear in the response from exif_read_data

    [GPSLatitudeRef] => N
    [GPSLatitude] => Array
        (
            [0] => 40/1
            [1] => 42/1
            [2] => 4941/100
        )

    [GPSLongitudeRef] => W
    [GPSLongitude] => Array
        (
            [0] => 73/1
            [1] => 57/1
            [2] => 2954/100
        )

Here is a sample image with EXIF GPS location:

https://dl.dropboxusercontent.com/u/34732957/test.jpg

Test script:
---------------
$exif = exif_read_data ("/path/to/photo.jpg");
print_r($exif);

Expected result:
----------------
Array
(
    [FileName] => test.jpg
    [FileDateTime] => 1472824820
    [FileSize] => 1406969
    [FileType] => 2
    [MimeType] => image/jpeg
    [SectionsFound] => ANY_TAG, IFD0, THUMBNAIL, EXIF, GPS
    [COMPUTED] => Array
        (
            [html] => width="3264" height="2448"
            [Height] => 2448
            [Width] => 3264
            [IsColor] => 1
            [ByteOrderMotorola] => 1
            [ApertureFNumber] => f/2.2
            [Thumbnail.FileType] => 2
            [Thumbnail.MimeType] => image/jpeg
        )

    [Make] => Apple
    [Model] => iPhone 5s
    [Orientation] => 1
    [XResolution] => 72/1
    [YResolution] => 72/1
    [ResolutionUnit] => 2
    [Software] => 9.2
    [DateTime] => 2016:04:10 17:05:26
    [YCbCrPositioning] => 1
    [Exif_IFD_Pointer] => 198
    [GPS_IFD_Pointer] => 1612
    [THUMBNAIL] => Array
        (
            [Compression] => 6
            [XResolution] => 72/1
            [YResolution] => 72/1
            [ResolutionUnit] => 2
            [JPEGInterchangeFormat] => 1952
            [JPEGInterchangeFormatLength] => 9663
        )

    [ExposureTime] => 1/1709
    [FNumber] => 11/5
    [ExposureProgram] => 2
    [ISOSpeedRatings] => 32
    [ExifVersion] => 0221
    [DateTimeOriginal] => 2016:04:10 17:05:26
    [DateTimeDigitized] => 2016:04:10 17:05:26
    [ComponentsConfiguration] => 
    [ShutterSpeedValue] => 19277/1795
    [ApertureValue] => 7983/3509
    [BrightnessValue] => 6632/653
    [ExposureBiasValue] => 0/1
    [MeteringMode] => 5
    [Flash] => 24
    [FocalLength] => 83/20
    [SubjectLocation] => Array
        (
            [0] => 1632
            [1] => 1224
            [2] => 1793
            [3] => 1073
        )

    [MakerNote] => Apple iOS...
    [SubSecTimeOriginal] => 986
    [SubSecTimeDigitized] => 986
    [FlashPixVersion] => 0100
    [ColorSpace] => 1
    [ExifImageWidth] => 3264
    [ExifImageLength] => 2448
    [SensingMethod] => 2
    [SceneType] => 
    [ExposureMode] => 0
    [WhiteBalance] => 0
    [DigitalZoomRatio] => 1224/463
    [FocalLengthIn35mmFilm] => 76
    [SceneCaptureType] => 0
    [UndefinedTag:0xA432] => Array
        (
            [0] => 83/20
            [1] => 83/20
            [2] => 11/5
            [3] => 11/5
        )

    [UndefinedTag:0xA433] => Apple
    [UndefinedTag:0xA434] => iPhone 5s back camera 4.15mm f/2.2
    [GPSLatitudeRef] => N
    [GPSLatitude] => Array
        (
            [0] => 40/1
            [1] => 42/1
            [2] => 4941/100
        )

    [GPSLongitudeRef] => W
    [GPSLongitude] => Array
        (
            [0] => 73/1
            [1] => 57/1
            [2] => 2954/100
        )

    [GPSAltitudeRef] => 
    [GPSAltitude] => 9068/843
    [GPSTimeStamp] => Array
        (
            [0] => 21/1
            [1] => 5/1
            [2] => 2426/100
        )

    [GPSSpeedRef] => K
    [GPSSpeed] => 0/1
    [GPSDateStamp] => 2016:04:10
    [UndefinedTag:0x001F] => 65/1
)


Actual result:
--------------
Array
(
    [FileName] => test.jpg
    [FileDateTime] => 1472776885
    [FileSize] => 1406969
    [FileType] => 2
    [MimeType] => image/jpeg
    [SectionsFound] => ANY_TAG, IFD0, EXIF
    [COMPUTED] => Array
        (
            [html] => width="3264" height="2448"
            [Height] => 2448
            [Width] => 3264
            [IsColor] => 1
            [ByteOrderMotorola] => 1
            [ApertureFNumber] => f/2.2
        )

    [Make] => Apple
    [Model] => iPhone 5s
    [Orientation] => 1
    [XResolution] => 72/1
    [YResolution] => 72/1
    [ResolutionUnit] => 2
    [Software] => 9.2
    [DateTime] => 2016:04:10 17:05:26
    [YCbCrPositioning] => 1
    [ExposureTime] => 1/1709
    [FNumber] => 11/5
    [ExposureProgram] => 2
    [ISOSpeedRatings] => 32
    [ExifVersion] => 0221
    [DateTimeOriginal] => 2016:04:10 17:05:26
    [DateTimeDigitized] => 2016:04:10 17:05:26
    [ComponentsConfiguration] => 
    [ShutterSpeedValue] => 19277/1795
    [ApertureValue] => 7983/3509
    [BrightnessValue] => 6632/653
    [ExposureBiasValue] => 0/1
    [MeteringMode] => 5
    [Flash] => 24
    [FocalLength] => 83/20
    [SubjectLocation] => Array
        (
            [0] => 1632
            [1] => 1224
            [2] => 1793
            [3] => 1073
        )

)


------------------------------------------------------------------------



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