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exif.c
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exif.c
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/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2001 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <rasmus@php.net> |
+----------------------------------------------------------------------+
*/
/* Much of the code in this module was borrowed from the public domain
jhead.c package with the author's consent. The main changes have been
to eliminate all the global variables to make it thread safe and to wrap
it in the PHP 4 API.
Aug.3 2001 - Added support for multiple M_COM entries - Rasmus
The original header from the jhead.c file was:
--------------------------------------------------------------------------
Program to pull the information out of various types of EFIF digital
camera files and show it in a reasonably consistent way
Version 0.9
Compiles with MSVC on Windows, or with GCC on Linux
Compileing under linux: Must include math library.
Use: cc -lm -O3 -o jhead jhead.c
Matthias Wandel, Dec 1999 - April 2000
--------------------------------------------------------------------------
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#if HAVE_EXIF
#include "php_exif.h"
#include <math.h>
#include "php_ini.h"
#include "ext/standard/php_string.h"
#include "ext/standard/info.h"
typedef unsigned char uchar;
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
#define EXIF_MAX_COMMENTS 12
/* {{{ structs
This structure stores Exif header image elements in a simple manner
Used to store camera data as extracted from the various ways that it can be
stored in a nexif header
*/
typedef struct {
char FileName [120];
time_t FileDateTime;
unsigned FileSize;
char CameraMake [32];
char CameraModel [64];
char DateTime [20];
int Height, Width;
int IsColor;
int FlashUsed;
float FocalLength;
float ExposureTime;
float ApertureFNumber;
float Distance;
float CCDWidth;
char *Comments[EXIF_MAX_COMMENTS];
int numComments;
double FocalplaneXRes;
double FocalplaneUnits;
int ExifImageWidth;
int MotorolaOrder;
int Orientation;
char GPSinfo[48];
int ISOspeed;
char ExifVersion[16];
char Copyright[32];
char Software[32];
char *Thumbnail;
int ThumbnailSize;
int ThumbnailOffset;
/* Olympus vars */
int SpecialMode;
int JpegQual;
int Macro;
int DigiZoom;
char SoftwareRelease[16];
char PictInfo[64];
char CameraId[64];
/* End Olympus vars */
} ImageInfoType;
/* This structure is used to store a section of a Jpeg file. */
typedef struct {
uchar *Data;
int Type;
unsigned Size;
} Section_t;
/* }}} */
#define EXIT_FAILURE 1
#define EXIT_SUCCESS 0
/* {{{ exif_functions[]
*/
function_entry exif_functions[] = {
PHP_FE(read_exif_data, NULL)
{NULL, NULL, NULL}
};
/* }}} */
PHP_MINFO_FUNCTION(exif);
/* {{{ exif_module_entry
*/
zend_module_entry exif_module_entry = {
"exif",
exif_functions,
NULL, NULL,
NULL, NULL,
PHP_MINFO(exif),
STANDARD_MODULE_PROPERTIES
};
/* }}} */
#ifdef COMPILE_DL_EXIF
ZEND_GET_MODULE(exif)
#endif
/* {{{ PHP_MINFO_FUNCTION
*/
PHP_MINFO_FUNCTION(exif)
{
php_info_print_table_start();
php_info_print_table_row(2, "EXIF Support", "enabled" );
php_info_print_table_end();
}
/* }}} */
/* {{{ Markers
JPEG markers consist of one or more 0xFF bytes, followed by a marker
code byte (which is not an FF). Here are the marker codes of interest
in this program. (See jdmarker.c for a more complete list.)
*/
#define M_SOF0 0xC0 /* Start Of Frame N */
#define M_SOF1 0xC1 /* N indicates which compression process */
#define M_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use */
#define M_SOF3 0xC3
#define M_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers */
#define M_SOF6 0xC6
#define M_SOF7 0xC7
#define M_SOF9 0xC9
#define M_SOF10 0xCA
#define M_SOF11 0xCB
#define M_SOF13 0xCD
#define M_SOF14 0xCE
#define M_SOF15 0xCF
#define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */
#define M_EOI 0xD9 /* End Of Image (end of datastream) */
#define M_SOS 0xDA /* Start Of Scan (begins compressed data) */
#define M_JFIF 0xE0
#define M_EXIF 0xE1
#define M_COM 0xFE /* COMment */
#define PSEUDO_IMAGE_MARKER 0x123; /* Extra value. */
/* }}} */
/* {{{ Get16m
Get 16 bits motorola order (always) for jpeg header stuff.
*/
static int Get16m(void *Short)
{
return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
}
/* }}} */
/* {{{ process_COM
Process a COM marker.
We want to print out the marker contents as legible text;
we must guard against random junk and varying newline representations.
*/
static void process_COM (ImageInfoType *ImageInfo, uchar *Data, int length)
{
int ch;
char Comment[250];
int nch;
int a;
if(ImageInfo->numComments == EXIF_MAX_COMMENTS) return;
nch = 0;
if (length > 200) length = 200; /* Truncate if it won't fit in our structure. */
for (a=2;a<length;a++) {
ch = Data[a];
if (ch == '\r' && Data[a+1] == '\n') continue; /* Remove cr followed by lf. */
if (isprint(ch) || ch == '\n' || ch == '\t') {
Comment[nch++] = (char)ch;
} else {
Comment[nch++] = '?';
}
}
Comment[nch] = '\0'; /* Null terminate */
a = ImageInfo->numComments;
(ImageInfo->Comments)[a] = emalloc(nch+1);
strcpy(ImageInfo->Comments[a], Comment);
(ImageInfo->numComments)++;
}
/* }}} */
/* {{{ process_SOFn
* Process a SOFn marker. This is useful for the image dimensions */
static void process_SOFn (ImageInfoType *ImageInfo, uchar *Data, int marker)
{
int data_precision, num_components;
const char *process;
data_precision = Data[2];
ImageInfo->Height = Get16m(Data+3);
ImageInfo->Width = Get16m(Data+5);
num_components = Data[7];
if (num_components == 3) {
ImageInfo->IsColor = 1;
} else {
ImageInfo->IsColor = 0;
}
switch (marker) {
case M_SOF0: process = "Baseline"; break;
case M_SOF1: process = "Extended sequential"; break;
case M_SOF2: process = "Progressive"; break;
case M_SOF3: process = "Lossless"; break;
case M_SOF5: process = "Differential sequential"; break;
case M_SOF6: process = "Differential progressive"; break;
case M_SOF7: process = "Differential lossless"; break;
case M_SOF9: process = "Extended sequential, arithmetic coding"; break;
case M_SOF10: process = "Progressive, arithmetic coding"; break;
case M_SOF11: process = "Lossless, arithmetic coding"; break;
case M_SOF13: process = "Differential sequential, arithmetic coding"; break;
case M_SOF14: process = "Differential progressive, arithmetic coding"; break;
case M_SOF15: process = "Differential lossless, arithmetic coding"; break;
default: process = "Unknown"; break;
}
}
/* }}} */
/* {{{ format description defines
Describes format descriptor
*/
static int ExifBytesPerFormat[] = {0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8};
#define NUM_FORMATS 12
#define FMT_BYTE 1
#define FMT_STRING 2
#define FMT_USHORT 3
#define FMT_ULONG 4
#define FMT_URATIONAL 5
#define FMT_SBYTE 6
#define FMT_UNDEFINED 7
#define FMT_SSHORT 8
#define FMT_SLONG 9
#define FMT_SRATIONAL 10
#define FMT_SINGLE 11
#define FMT_DOUBLE 12
/*
Describes tag values
*/
#define TAG_EXIF_OFFSET 0x8769
#define TAG_INTEROP_OFFSET 0xa005
#define TAG_COMPRESSION 0x0103
#define TAG_MAKE 0x010F
#define TAG_MODEL 0x0110
#define TAG_ORIENTATION 0x0112
#define TAG_SOFTWARE 0x0131
/* Olympus specific tags */
#define TAG_SPECIALMODE 0x0200
#define TAG_JPEGQUAL 0x0201
#define TAG_MACRO 0x0202
#define TAG_DIGIZOOM 0x0204
#define TAG_SOFTWARERELEASE 0x0207
#define TAG_PICTINFO 0x0208
#define TAG_CAMERAID 0x0209
/* end Olympus specific tags */
#define TAG_COPYRIGHT 0x8298
#define TAG_EXPOSURETIME 0x829A
#define TAG_FNUMBER 0x829D
#define TAG_GPSINFO 0x8825
#define TAG_ISOSPEED 0x8827
#define TAG_EXIFVERSION 0x9000
#define TAG_SHUTTERSPEED 0x9201
#define TAG_APERTURE 0x9202
#define TAG_MAXAPERTURE 0x9205
#define TAG_FOCALLENGTH 0x920A
#define TAG_DATETIME_ORIGINAL 0x9003
#define TAG_USERCOMMENT 0x9286
#define TAG_SUBJECT_DISTANCE 0x9206
#define TAG_LIGHT_SOURCE 0x9208
#define TAG_FLASH 0x9209
#define TAG_FOCALPLANEXRES 0xa20E
#define TAG_FOCALPLANEUNITS 0xa210
#define TAG_IMAGEWIDTH 0xA002
/* }}} */
/* {{{ TabTable[]
*/
static const struct {
unsigned short Tag;
char *Desc;
} TagTable[] = {
{ 0x100, "ImageWidth"},
{ 0x101, "ImageLength"},
{ 0x102, "BitsPerSample"},
{ 0x103, "Compression"},
{ 0x106, "PhotometricInterpretation"},
{ 0x10A, "FillOrder"},
{ 0x10D, "DocumentName"},
{ 0x10E, "ImageDescription"},
{ 0x10F, "Make"},
{ 0x110, "Model"},
{ 0x111, "StripOffsets"},
{ 0x112, "Orientation"},
{ 0x115, "SamplesPerPixel"},
{ 0x116, "RowsPerStrip"},
{ 0x117, "StripByteCounts"},
{ 0x11A, "XResolution"},
{ 0x11B, "YResolution"},
{ 0x11C, "PlanarConfiguration"},
{ 0x128, "ResolutionUnit"},
{ 0x12D, "TransferFunction"},
{ 0x131, "Software"},
{ 0x132, "DateTime"},
{ 0x13B, "Artist"},
{ 0x13E, "WhitePoint"},
{ 0x13F, "PrimaryChromaticities"},
{ 0x156, "TransferRange"},
{ 0x200, "JPEGProc"},
{ 0x201, "JPEGInterchangeFormat"},
{ 0x202, "JPEGInterchangeFormatLength"},
{ 0x211, "YCbCrCoefficients"},
{ 0x212, "YCbCrSubSampling"},
{ 0x213, "YCbCrPositioning"},
{ 0x214, "ReferenceBlackWhite"},
{ 0x1000, "RelatedImageFileFormat"},
{ 0x828D, "CFARepeatPatternDim"},
{ 0x828E, "CFAPattern"},
{ 0x828F, "BatteryLevel"},
{ 0x8298, "Copyright"},
{ 0x829A, "ExposureTime"},
{ 0x829D, "FNumber"},
{ 0x83BB, "IPTC/NAA"},
{ 0x8769, "ExifOffset"},
{ 0x8773, "InterColorProfile"},
{ 0x8822, "ExposureProgram"},
{ 0x8824, "SpectralSensitivity"},
{ 0x8825, "GPSInfo"},
{ 0x8827, "ISOSpeedRatings"},
{ 0x8828, "OECF"},
{ 0x9000, "ExifVersion"},
{ 0x9003, "DateTimeOriginal"},
{ 0x9004, "DateTimeDigitized"},
{ 0x9101, "ComponentsConfiguration"},
{ 0x9102, "CompressedBitsPerPixel"},
{ 0x9201, "ShutterSpeedValue"},
{ 0x9202, "ApertureValue"},
{ 0x9203, "BrightnessValue"},
{ 0x9204, "ExposureBiasValue"},
{ 0x9205, "MaxApertureValue"},
{ 0x9206, "SubjectDistance"},
{ 0x9207, "MeteringMode"},
{ 0x9208, "LightSource"},
{ 0x9209, "Flash"},
{ 0x920A, "FocalLength"},
{ 0x927C, "MakerNote"},
{ 0x9286, "UserComment"},
{ 0x9290, "SubSecTime"},
{ 0x9291, "SubSecTimeOriginal"},
{ 0x9292, "SubSecTimeDigitized"},
{ 0xA000, "FlashPixVersion"},
{ 0xA001, "ColorSpace"},
{ 0xA002, "ExifImageWidth"},
{ 0xA003, "ExifImageLength"},
{ 0xA005, "InteroperabilityOffset"},
{ 0xA20B, "FlashEnergy"}, /* 0x920B in TIFF/EP */
{ 0xA20C, "SpatialFrequencyResponse"}, /* 0x920C - - */
{ 0xA20E, "FocalPlaneXResolution"}, /* 0x920E - - */
{ 0xA20F, "FocalPlaneYResolution"}, /* 0x920F - - */
{ 0xA210, "FocalPlaneResolutionUnit"}, /* 0x9210 - - */
{ 0xA214, "SubjectLocation"}, /* 0x9214 - - */
{ 0xA215, "ExposureIndex"}, /* 0x9215 - - */
{ 0xA217, "SensingMethod"}, /* 0x9217 - - */
{ 0xA300, "FileSource"},
{ 0xA301, "SceneType"},
{ 0, NULL}
} ;
/* }}} */
/* {{{ Get16u
* Convert a 16 bit unsigned value from file's native byte order */
static int Get16u(void *Short, int MotorolaOrder)
{
if (MotorolaOrder) {
return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
} else {
return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
}
}
/* }}} */
/* {{{ Get32s
* Convert a 32 bit signed value from file's native byte order */
static int Get32s(void *Long, int MotorolaOrder)
{
if (MotorolaOrder) {
return ((( char *)Long)[0] << 24) | (((uchar *)Long)[1] << 16)
| (((uchar *)Long)[2] << 8 ) | (((uchar *)Long)[3] << 0 );
} else {
return ((( char *)Long)[3] << 24) | (((uchar *)Long)[2] << 16)
| (((uchar *)Long)[1] << 8 ) | (((uchar *)Long)[0] << 0 );
}
}
/* }}} */
/* {{{ Get32u
* Convert a 32 bit unsigned value from file's native byte order */
static unsigned Get32u(void *Long, int MotorolaOrder)
{
return (unsigned)Get32s(Long, MotorolaOrder) & 0xffffffff;
}
/* }}} */
/* {{{ ConvertAnyFormat
* Evaluate number, be it int, rational, or float from directory. */
static double ConvertAnyFormat(void *ValuePtr, int Format, int MotorolaOrder)
{
double Value;
Value = 0;
switch(Format) {
case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
case FMT_BYTE: Value = *(uchar *)ValuePtr; break;
case FMT_USHORT: Value = Get16u(ValuePtr, MotorolaOrder); break;
case FMT_ULONG: Value = Get32u(ValuePtr, MotorolaOrder); break;
case FMT_URATIONAL:
case FMT_SRATIONAL:
{
int Num, Den;
Num = Get32s(ValuePtr, MotorolaOrder);
Den = Get32s(4+(char *)ValuePtr, MotorolaOrder);
if (Den == 0) {
Value = 0;
} else {
Value = (double)Num/Den;
}
break;
}
case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr, MotorolaOrder); break;
case FMT_SLONG: Value = Get32s(ValuePtr, MotorolaOrder); break;
/* Not sure if this is correct (never seen float used in Exif format) */
case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
}
return Value;
}
/* }}} */
/* {{{ ExtractThumbnail
* Grab the thumbnail - by Matt Bonneau */
static void ExtractThumbnail(ImageInfoType *ImageInfo, char *OffsetBase, unsigned ExifLength) {
/* according to exif2.1, the thumbnail is not supposed to be greater than 64K */
if (ImageInfo->ThumbnailSize > 65536) {
php_error(E_WARNING, "Illegal thumbnail size");
return;
}
ImageInfo->Thumbnail = emalloc(ImageInfo->ThumbnailSize);
if (!ImageInfo->Thumbnail) {
php_error(E_WARNING, "Could not allocate memory for thumbnail");
return;
} else {
/* Check to make sure we are not going to go past the ExifLength */
if ((unsigned)(ImageInfo->ThumbnailOffset + ImageInfo->ThumbnailSize) > ExifLength) {
php_error(E_WARNING, "Thumbnail goes beyond exif header boundary");
return;
} else {
memcpy(ImageInfo->Thumbnail, OffsetBase + ImageInfo->ThumbnailOffset, ImageInfo->ThumbnailSize);
}
}
}
/* }}} */
/* {{{ ProcessExifDir
* Process one of the nested EXIF directories. */
static void ProcessExifDir(ImageInfoType *ImageInfo, char *DirStart, char *OffsetBase, unsigned ExifLength, char *LastExifRefd)
{
int de;
int a;
int NumDirEntries;
int NextDirOffset;
NumDirEntries = Get16u(DirStart, ImageInfo->MotorolaOrder);
if ((DirStart+2+NumDirEntries*12) > (OffsetBase+ExifLength)) {
php_error(E_WARNING, "Illegally sized directory");
return;
}
/*
if (ShowTags) {
printf("Directory with %d entries\n", NumDirEntries);
}
*/
for (de=0;de<NumDirEntries;de++) {
int Tag, Format, Components;
char *ValuePtr;
int ByteCount;
char *DirEntry;
DirEntry = DirStart+2+12*de;
Tag = Get16u(DirEntry, ImageInfo->MotorolaOrder);
Format = Get16u(DirEntry+2, ImageInfo->MotorolaOrder);
Components = Get32u(DirEntry+4, ImageInfo->MotorolaOrder);
if ((Format-1) >= NUM_FORMATS) {
/* (-1) catches illegal zero case as unsigned underflows to positive large. */
php_error(E_WARNING, "Illegal format code in EXIF dir");
return;
}
ByteCount = Components * ExifBytesPerFormat[Format];
if (ByteCount > 4) {
unsigned OffsetVal;
OffsetVal = Get32u(DirEntry+8, ImageInfo->MotorolaOrder);
/* If its bigger than 4 bytes, the dir entry contains an offset. */
if (OffsetVal+ByteCount > ExifLength) {
/* Bogus pointer offset and / or bytecount value */
/* printf("Offset %d bytes %d ExifLen %d\n", OffsetVal, ByteCount, ExifLength); */
php_error(E_WARNING, "Illegal pointer offset value in EXIF");
return;
}
ValuePtr = OffsetBase+OffsetVal;
} else {
/* 4 bytes or less and value is in the dir entry itself */
ValuePtr = DirEntry+8;
}
if (LastExifRefd < ValuePtr+ByteCount) {
/*
Keep track of last byte in the exif header that was actually referenced.
That way, we know where the discardable thumbnail data begins.
*/
LastExifRefd = ValuePtr+ByteCount;
}
/* Extract useful components of tag */
switch(Tag) {
case TAG_MAKE:
strlcpy(ImageInfo->CameraMake, ValuePtr, sizeof(ImageInfo->CameraMake));
break;
case TAG_MODEL:
strlcpy(ImageInfo->CameraModel, ValuePtr, sizeof(ImageInfo->CameraModel));
break;
case TAG_GPSINFO:
strlcpy(ImageInfo->GPSinfo, ValuePtr, sizeof(ImageInfo->GPSinfo));
break;
case TAG_EXIFVERSION:
strlcpy(ImageInfo->ExifVersion, ValuePtr, sizeof(ImageInfo->ExifVersion));
break;
case TAG_COPYRIGHT:
strlcpy(ImageInfo->Copyright, ValuePtr, sizeof(ImageInfo->Copyright));
break;
case TAG_SOFTWARE:
strlcpy(ImageInfo->Software, ValuePtr, sizeof(ImageInfo->Software));
break;
case TAG_ORIENTATION:
ImageInfo->Orientation = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_ISOSPEED:
ImageInfo->ISOspeed = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_DATETIME_ORIGINAL:
strlcpy(ImageInfo->DateTime, ValuePtr, sizeof(ImageInfo->DateTime));
break;
case TAG_USERCOMMENT:
/* Olympus has this padded with trailing spaces. Remove these first. */
for (a=ByteCount;;) {
a--;
if ((ValuePtr)[a] == ' ') {
(ValuePtr)[a] = '\0';
} else {
break;
}
if (a == 0) break;
}
/* Copy the comment */
if (memcmp(ValuePtr, "ASCII", 5) == 0) {
for (a=5;a<10;a++) {
int c; int l;
c = (ValuePtr)[a];
if (c != '\0' && c != ' ') {
l = strlen(a+ValuePtr)+1;
l = (l<200)?l:201;
(ImageInfo->Comments)[ImageInfo->numComments] = emalloc(l);
strlcpy((ImageInfo->Comments)[ImageInfo->numComments], a+ValuePtr, l);
ImageInfo->numComments++;
break;
}
}
} else {
int l;
l = strlen(ValuePtr)+1;
l = (l<200)?l:201;
(ImageInfo->Comments)[ImageInfo->numComments] = emalloc(l);
strlcpy((ImageInfo->Comments)[ImageInfo->numComments], ValuePtr, l);
}
break;
case TAG_FNUMBER:
/* Simplest way of expressing aperture, so I trust it the most.
(overwrite previously computd value if there is one) */
ImageInfo->ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_APERTURE:
case TAG_MAXAPERTURE:
/* More relevant info always comes earlier, so only use this field if we don't
have appropriate aperture information yet. */
if (ImageInfo->ApertureFNumber == 0) {
ImageInfo->ApertureFNumber
= (float)exp(ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder)*log(2)*0.5);
}
break;
case TAG_FOCALLENGTH:
/* Nice digital cameras actually save the focal length as a function
of how farthey are zoomed in. */
ImageInfo->FocalLength = (float)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_SUBJECT_DISTANCE:
/* Inidcates the distacne the autofocus camera is focused to.
Tends to be less accurate as distance increases. */
ImageInfo->Distance = (float)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_EXPOSURETIME:
/* Simplest way of expressing exposure time, so I trust it most.
(overwrite previously computd value if there is one) */
ImageInfo->ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_SHUTTERSPEED:
/* More complicated way of expressing exposure time, so only use
this value if we don't already have it from somewhere else. */
if (ImageInfo->ExposureTime == 0) {
ImageInfo->ExposureTime
= (float)(1/exp(ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder)*log(2)));
}
break;
case TAG_FLASH:
if (ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder)) {
ImageInfo->FlashUsed = 1;
}
break;
case TAG_IMAGEWIDTH:
ImageInfo->ExifImageWidth = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_FOCALPLANEXRES:
ImageInfo->FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder);
break;
case TAG_FOCALPLANEUNITS:
switch((int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->MotorolaOrder)) {
case 1: ImageInfo->FocalplaneUnits = 25.4; break; /* inch */
case 2:
/* According to the information I was using, 2 measn meters.
But looking at the Cannon powershot's files, inches is the only
sensible value. */
ImageInfo->FocalplaneUnits = 25.4;
break;
case 3: ImageInfo->FocalplaneUnits = 10; break; /* centimeter */
case 4: ImageInfo->FocalplaneUnits = 1; break; /* milimeter */
case 5: ImageInfo->FocalplaneUnits = .001; break; /* micrometer */
}
break;
case TAG_LIGHT_SOURCE:
/* Rarely set or useful. */
break;
case TAG_SPECIALMODE:
ImageInfo->SpecialMode = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->SpecialMode);
break;
case TAG_JPEGQUAL: /* I think that this is a pointer to the thumbnail - let's see */
ImageInfo->ThumbnailOffset = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->ThumbnailOffset);
/* see if we know the size */
if (ImageInfo->ThumbnailSize) {
ExtractThumbnail(ImageInfo, OffsetBase, ExifLength);
}
/*ImageInfo->JpegQual = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->JpegQual);*/
break;
case TAG_MACRO: /* I think this is the size of the Thumbnail */
ImageInfo->ThumbnailSize = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->ThumbnailSize);
/* see if we have the offset */
if (ImageInfo->ThumbnailOffset) {
ExtractThumbnail(ImageInfo, OffsetBase, ExifLength);
}
/*ImageInfo->Macro = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->Macro);*/
break;
case TAG_DIGIZOOM:
ImageInfo->DigiZoom = (int)ConvertAnyFormat(ValuePtr, Format, ImageInfo->DigiZoom);
break;
case TAG_SOFTWARERELEASE:
strlcpy(ImageInfo->SoftwareRelease, ValuePtr, sizeof(ImageInfo->SoftwareRelease));
break;
case TAG_PICTINFO:
strlcpy(ImageInfo->PictInfo, ValuePtr, sizeof(ImageInfo->PictInfo));
break;
case TAG_CAMERAID:
strlcpy(ImageInfo->CameraId, ValuePtr, sizeof(ImageInfo->CameraId));
break;
}
if (Tag == TAG_EXIF_OFFSET || Tag == TAG_INTEROP_OFFSET) {
char *SubdirStart;
SubdirStart = OffsetBase + Get32u(ValuePtr, ImageInfo->MotorolaOrder);
if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength) {
php_error(E_WARNING, "Illegal subdirectory link");
return;
}
ProcessExifDir(ImageInfo, SubdirStart, OffsetBase, ExifLength, LastExifRefd);
continue;
}
}
/*
* Hack to make it process IDF1 I hope
* There are 2 IDFs, the second one holds the keys (0x0201 and 0x0202) to the thumbnail
*/
NextDirOffset = Get32u(DirStart+2+12*de, ImageInfo->MotorolaOrder);
if (NextDirOffset) {
if (OffsetBase + NextDirOffset < OffsetBase || OffsetBase + NextDirOffset > OffsetBase+ExifLength) {
php_error(E_WARNING, "Illegal directory offset");
return;
}
ProcessExifDir(ImageInfo, OffsetBase + NextDirOffset, OffsetBase, ExifLength, LastExifRefd);
}
}
/* }}} */
/* {{{ process_EXIF
Process an EXIF marker
Describes all the drivel that most digital cameras include...
*/
static void process_EXIF (ImageInfoType *ImageInfo, char *CharBuf, unsigned int length, char *LastExifRefd)
{
ImageInfo->FlashUsed = 0; /* If it s from a digicam, and it used flash, it says so. */
LastExifRefd = CharBuf;
ImageInfo->FocalplaneXRes = 0;
ImageInfo->FocalplaneUnits = 0;
ImageInfo->ExifImageWidth = 0;
/* set the thumbnail stuff to nothing so we can test to see if they get set up */
ImageInfo->Thumbnail = NULL;
ImageInfo->ThumbnailSize = 0;
{ /* Check the EXIF header component */
static const uchar ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
if (memcmp(CharBuf+2, ExifHeader, 6)) {
php_error(E_WARNING, "Incorrect Exif header");
return;
}
}
if (memcmp(CharBuf+8, "II", 2) == 0) {
/* if (ShowTags) printf("Exif section in Intel order\n"); */
ImageInfo->MotorolaOrder = 0;
} else {
if (memcmp(CharBuf+8, "MM", 2) == 0) {
/* if (ShowTags) printf("Exif section in Motorola order\n"); */
ImageInfo->MotorolaOrder = 1;
} else {
php_error(E_WARNING, "Invalid Exif alignment marker.");
return;
}
}
/* Check the next two values for correctness. */
if (Get16u(CharBuf+10, ImageInfo->MotorolaOrder) != 0x2a
|| Get32u(CharBuf+12, ImageInfo->MotorolaOrder) != 0x08) {
php_error(E_WARNING, "Invalid Exif start (1)");
return;
}
/* First directory starts 16 bytes in. Offsets start at 8 bytes in. */
ProcessExifDir(ImageInfo, CharBuf+16, CharBuf+8, length-6, LastExifRefd);
/* MB: This is where I will make my attempt to get the tumbnail */
/* Compute the CCD width, in milimeters. */
if (ImageInfo->FocalplaneXRes != 0) {
ImageInfo->CCDWidth = (float)(ImageInfo->ExifImageWidth * ImageInfo->FocalplaneUnits / ImageInfo->FocalplaneXRes);
}
}
/* }}} */
/* {{{ scan_JPEG_header
* Parse the marker stream until SOS or EOI is seen; */
static int scan_JPEG_header (ImageInfoType *ImageInfo, FILE *infile, Section_t *Sections, int *SectionsRead, int ReadAll, char *LastExifRefd)
{
int a;
/*
int HaveCom = FALSE;
*/
a = fgetc(infile);
if (a != 0xff || fgetc(infile) != M_SOI) {
return FALSE;
}
for(*SectionsRead=0;*SectionsRead < 19;) {
int itemlen;
int marker = 0;
int ll, lh, got;
uchar *Data;
for (a=0;a<7;a++) {
marker = fgetc(infile);
if (marker != 0xff) break;
}
if (marker == 0xff) {
/* 0xff is legal padding, but if we get that many, something's wrong. */
php_error(E_WARNING, "too many padding bytes!");
return FALSE;
}
Sections[*SectionsRead].Type = marker;
/* Read the length of the section. */
lh = fgetc(infile);
ll = fgetc(infile);
itemlen = (lh << 8) | ll;
if (itemlen < 2) {
php_error(E_WARNING, "invalid marker");
return FALSE;
}
Sections[*SectionsRead].Size = itemlen;
Data = (uchar *)emalloc(itemlen+1); /* Add 1 to allow sticking a 0 at the end. */
Sections[*SectionsRead].Data = Data;
/* Store first two pre-read bytes. */
Data[0] = (uchar)lh;
Data[1] = (uchar)ll;
got = fread(Data+2, 1, itemlen-2, infile); /* Read the whole section. */
if (got != itemlen-2) {
php_error(E_WARNING, "reading from file");
return FALSE;
}
*SectionsRead += 1;
/*printf("Marker '%x' size %d\n", marker, itemlen);*/
switch(marker) {
case M_SOS: /* stop before hitting compressed data */
/* If reading entire image is requested, read the rest of the data. */
if (ReadAll) {
int cp, ep, size;
/* Determine how much file is left. */
cp = ftell(infile);
fseek(infile, 0, SEEK_END);
ep = ftell(infile);
fseek(infile, cp, SEEK_SET);
size = ep-cp;
Data = (uchar *)emalloc(size);
if (Data == NULL) {
php_error(E_WARNING, "could not allocate data for entire image");
return FALSE;
}
got = fread(Data, 1, size, infile);
if (got != size) {
php_error(E_WARNING, "could not read the rest of the image");
return FALSE;
}
Sections[*SectionsRead].Data = Data;
Sections[*SectionsRead].Size = size;
Sections[*SectionsRead].Type = PSEUDO_IMAGE_MARKER;
(*SectionsRead)++;
/*
*HaveAll = 1;
*/
efree(Data);
}
return TRUE;
case M_EOI: /* in case it's a tables-only JPEG stream */
php_error(E_WARNING, "No image in jpeg!");
return FALSE;
case M_COM: /* Comment section */
/*
if (HaveCom) {
(*SectionsRead) -= 1;
efree(Sections[*SectionsRead].Data);
} else {
process_COM(ImageInfo, Data, itemlen);
HaveCom = TRUE;
}
*/
process_COM(ImageInfo, Data, itemlen);
break;
case M_EXIF:
if (*SectionsRead <= 2) {
/* Seen files from some 'U-lead' software with Vivitar scanner
that uses marker 31 later in the file (no clue what for!) */
process_EXIF(ImageInfo, (char *)Data, itemlen, LastExifRefd);
}
break;
case M_JFIF: