Fixed Redhat bug #1362571 (PHP not returning full results for exif_read_data function)

There are two factors for this bug fix:
 - First of all, the maximum nesting level has been increased to 150 (previously 100), I'm not sure how much an impact this will have, but increasing this value also seems to resolve PHP bug #66443 (Corrupt EXIF header: maximum directory nesting level reached for some cameras.)
  - Second, this adds support for most common Panasonic EXIF tags, again this list is based off the Exiv2 website

Note about Panasonic's format:
From what I could find, then the offset was always 12 bytes for such, the signature always had the 'P' capitalized, and the rest lower cased, followed by 3 NULL bytes

@Remi, can you review this? I'm gonna look into Sony (which is huge btw!) and your patch next

ext/exif/exif.c

@@ -89,7 +89,7 @@ typedef unsigned char uchar;
 
 #define EFREE_IF(ptr)	if (ptr) efree(ptr)
 
-#define MAX_IFD_NESTING_LEVEL 100
+#define MAX_IFD_NESTING_LEVEL 150
 
 /* {{{ arginfo */
 ZEND_BEGIN_ARG_INFO(arginfo_exif_tagname, 0)
@@ -989,6 +989,112 @@ static tag_info_array tag_table_VND_SAMSUNG = {
   TAG_TABLE_END
 };
 
+static tag_info_array tag_table_VND_PANASONIC = {
+  { 0x0001, "Quality"},
+  { 0x0002, "FirmwareVersion"},
+  { 0x0003, "WhiteBalance"},
+  { 0x0004, "0x0004"},
+  { 0x0007, "FocusMode"},
+  { 0x000f, "AFMode"},
+  { 0x001a, "ImageStabilization"},
+  { 0x001c, "Macro"},
+  { 0x001f, "ShootingMode"},
+  { 0x0020, "Audio"},
+  { 0x0021, "DataDump"},
+  { 0x0022, "0x0022"},
+  { 0x0023, "WhiteBalanceBias"},
+  { 0x0024, "FlashBias"},
+  { 0x0025, "InternalSerialNumber"},
+  { 0x0026, "ExifVersion"},
+  { 0x0027, "0x0027"},
+  { 0x0028, "ColorEffect"},
+  { 0x0029, "TimeSincePowerOn"},
+  { 0x002a, "BurstMode"},
+  { 0x002b, "SequenceNumber"},
+  { 0x002c, "Contrast"},
+  { 0x002d, "NoiseReduction"},
+  { 0x002e, "SelfTimer"},
+  { 0x002f, "0x002f"},
+  { 0x0030, "Rotation"},
+  { 0x0031, "AFAssistLamp"},
+  { 0x0032, "ColorMode"},
+  { 0x0033, "BabyAge1"},
+  { 0x0034, "OpticalZoomMode"},
+  { 0x0035, "ConversionLens"},
+  { 0x0036, "TravelDay"},
+  { 0x0039, "Contrast"},
+  { 0x003a, "WorldTimeLocation"},
+  { 0x003b, "TextStamp1"},
+  { 0x003c, "ProgramISO"},
+  { 0x003d, "AdvancedSceneType"},
+  { 0x003e, "TextStamp2"},
+  { 0x003f, "FacesDetected"},
+  { 0x0040, "Saturation"},
+  { 0x0041, "Sharpness"},
+  { 0x0042, "FilmMode"},
+  { 0x0044, "ColorTempKelvin"},
+  { 0x0045, "BracketSettings"},
+  { 0x0046, "WBAdjustAB"},
+  { 0x0047, "WBAdjustGM"},
+  { 0x0048, "FlashCurtain"},
+  { 0x0049, "LongShutterNoiseReduction"},
+  { 0x004b, "ImageWidth"},
+  { 0x004c, "ImageHeight"},
+  { 0x004d, "AFPointPosition"},
+  { 0x004e, "FaceDetInfo"},
+  { 0x0051, "LensType"},
+  { 0x0052, "LensSerialNumber"},
+  { 0x0053, "AccessoryType"},
+  { 0x0054, "AccessorySerialNumber"},
+  { 0x0059, "Transform1"},
+  { 0x005d, "IntelligentExposure"},
+  { 0x0060, "LensFirmwareVersion"},
+  { 0x0061, "FaceRecInfo"},
+  { 0x0062, "FlashWarning"},
+  { 0x0065, "Title"},
+  { 0x0066, "BabyName"},
+  { 0x0067, "Location"},
+  { 0x0069, "Country"},
+  { 0x006b, "State"},
+  { 0x006d, "City"},
+  { 0x006f, "Landmark"},
+  { 0x0070, "IntelligentResolution"},
+  { 0x0077, "BurstSheed"},
+  { 0x0079, "IntelligentDRange"},
+  { 0x007c, "ClearRetouch"},
+  { 0x0080, "City2"},
+  { 0x0086, "ManometerPressure"},
+  { 0x0089, "PhotoStyle"},
+  { 0x008a, "ShadingCompensation"},
+  { 0x008c, "AccelerometerZ"},
+  { 0x008d, "AccelerometerX"},
+  { 0x008e, "AccelerometerY"},
+  { 0x008f, "CameraOrientation"},
+  { 0x0090, "RollAngle"},
+  { 0x0091, "PitchAngle"},
+  { 0x0093, "SweepPanoramaDirection"},
+  { 0x0094, "PanoramaFieldOfView"},
+  { 0x0096, "TimerRecording"},
+  { 0x009d, "InternalNDFilter"},
+  { 0x009e, "HDR"},
+  { 0x009f, "ShutterType"},
+  { 0x00a3, "ClearRetouchValue"},
+  { 0x00ab, "TouchAE"},
+  { 0x0e00, "PrintIM"},
+  { 0x4449, "0x4449"},
+  { 0x8000, "MakerNoteVersion"},
+  { 0x8001, "SceneMode"},
+  { 0x8004, "WBRedLevel"},
+  { 0x8005, "WBGreenLevel"},
+  { 0x8006, "WBBlueLevel"},
+  { 0x8007, "FlashFired"},
+  { 0x8008, "TextStamp3"},
+  { 0x8009, "TextStamp4"},
+  { 0x8010, "BabyAge2"},
+  { 0x8012, "Transform2"},
+  TAG_TABLE_END
+};
+
 typedef enum mn_byte_order_t {
 	MN_ORDER_INTEL    = 0,
 	MN_ORDER_MOTOROLA = 1,
@@ -1020,7 +1126,8 @@ static const maker_note_type maker_note_array[] = {
   { tag_table_VND_NIKON,     "NIKON",                   NULL,  "Nikon\x00\x01\x00",        8,  8,  MN_ORDER_NORMAL,   MN_OFFSET_NORMAL},
   { tag_table_VND_NIKON_990, "NIKON",                   NULL,  NULL,                       0,  0,  MN_ORDER_NORMAL,   MN_OFFSET_NORMAL},
   { tag_table_VND_OLYMPUS,   "OLYMPUS OPTICAL CO.,LTD", NULL,  "OLYMP\x00\x01\x00",        8,  8,  MN_ORDER_NORMAL,   MN_OFFSET_NORMAL},
-  { tag_table_VND_SAMSUNG,   "SAMSUNG",                 NULL, NULL,                        0,  0,  MN_ORDER_NORMAL,   MN_OFFSET_NORMAL}
+  { tag_table_VND_SAMSUNG,   "SAMSUNG",                 NULL, NULL,                        0,  0,  MN_ORDER_NORMAL,   MN_OFFSET_NORMAL}, 
+  { tag_table_VND_PANASONIC, "Panasonic",               NULL, "Panasonic\x00\x00\x00",     12, 12, MN_ORDER_NORMAL,   MN_OFFSET_NORMAL}
 };
 /* }}} */
 

ext/exif/tests/redhat-bug1362571.phpt

@@ -0,0 +1,10 @@
+--TEST--
+Redhat bug #1362571 (PHP not returning full results for exif_read_data function)
+--SKIPIF--
+<?php if (!extension_loaded('exif')) print 'skip exif extension not available';?>
+--FILE--
+<?php
+var_dump(strlen(exif_thumbnail(__DIR__ . DIRECTORY_SEPARATOR . 'redhat-bug1362571.jpg')) > 0);
+?>
+--EXPECT--
+bool(true)