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exif.c
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//--------------------------------------------------------------------------
// Program to pull the information out of various types of EXIF digital
// camera files and show it in a reasonably consistent way
//
// This module parses the very complicated exif structures.
//
// Matthias Wandel
//--------------------------------------------------------------------------
#include "jhead.h"
#include <math.h>
#include <ctype.h>
#include <utils/Log.h>
static unsigned char * DirWithThumbnailPtrs;
static double FocalplaneXRes;
static double FocalplaneUnits;
static int ExifImageWidth;
static int MotorolaOrder = 0;
// for fixing the rotation.
static void * OrientationPtr[2];
static int OrientationNumFormat[2];
int NumOrientations = 0;
// Define the line below to turn on poor man's debugging output
#undef SUPERDEBUG
#ifdef SUPERDEBUG
#define printf ALOGE
#endif
//--------------------------------------------------------------------------
// Table of Jpeg encoding process names
static const TagTable_t ProcessTable[] = {
{ M_SOF0, "Baseline", 0, 0},
{ M_SOF1, "Extended sequential", 0, 0},
{ M_SOF2, "Progressive", 0, 0},
{ M_SOF3, "Lossless", 0, 0},
{ M_SOF5, "Differential sequential", 0, 0},
{ M_SOF6, "Differential progressive", 0, 0},
{ M_SOF7, "Differential lossless", 0, 0},
{ M_SOF9, "Extended sequential, arithmetic coding", 0, 0},
{ M_SOF10, "Progressive, arithmetic coding", 0, 0},
{ M_SOF11, "Lossless, arithmetic coding", 0, 0},
{ M_SOF13, "Differential sequential, arithmetic coding", 0, 0},
{ M_SOF14, "Differential progressive, arithmetic coding", 0, 0},
{ M_SOF15, "Differential lossless, arithmetic coding", 0, 0},
};
#define PROCESS_TABLE_SIZE (sizeof(ProcessTable) / sizeof(TagTable_t))
// 1 - "The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side."
// 2 - "The 0th row is at the visual top of the image, and the 0th column is the visual right-hand side."
// 3 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side."
// 4 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side."
// 5 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual top."
// 6 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual top."
// 7 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual bottom."
// 8 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual bottom."
// Note: The descriptions here are the same as the name of the command line
// option to pass to jpegtran to right the image
static const char * OrientTab[9] = {
"Undefined",
"Normal", // 1
"flip horizontal", // left right reversed mirror
"rotate 180", // 3
"flip vertical", // upside down mirror
"transpose", // Flipped about top-left <--> bottom-right axis.
"rotate 90", // rotate 90 cw to right it.
"transverse", // flipped about top-right <--> bottom-left axis
"rotate 270", // rotate 270 to right it.
};
const int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
//--------------------------------------------------------------------------
// Describes tag values
#define TAG_INTEROP_INDEX 0x0001
#define TAG_INTEROP_VERSION 0x0002
#define TAG_IMAGE_WIDTH 0x0100
#define TAG_IMAGE_LENGTH 0x0101
#define TAG_BITS_PER_SAMPLE 0x0102
#define TAG_COMPRESSION 0x0103
#define TAG_PHOTOMETRIC_INTERP 0x0106
#define TAG_FILL_ORDER 0x010A
#define TAG_DOCUMENT_NAME 0x010D
#define TAG_IMAGE_DESCRIPTION 0x010E
#define TAG_MAKE 0x010F
#define TAG_MODEL 0x0110
#define TAG_SRIP_OFFSET 0x0111
#define TAG_ORIENTATION 0x0112
#define TAG_SAMPLES_PER_PIXEL 0x0115
#define TAG_ROWS_PER_STRIP 0x0116
#define TAG_STRIP_BYTE_COUNTS 0x0117
#define TAG_X_RESOLUTION 0x011A
#define TAG_Y_RESOLUTION 0x011B
#define TAG_PLANAR_CONFIGURATION 0x011C
#define TAG_RESOLUTION_UNIT 0x0128
#define TAG_TRANSFER_FUNCTION 0x012D
#define TAG_SOFTWARE 0x0131
#define TAG_DATETIME 0x0132
#define TAG_ARTIST 0x013B
#define TAG_WHITE_POINT 0x013E
#define TAG_PRIMARY_CHROMATICITIES 0x013F
#define TAG_TRANSFER_RANGE 0x0156
#define TAG_JPEG_PROC 0x0200
#define TAG_THUMBNAIL_OFFSET 0x0201
#define TAG_THUMBNAIL_LENGTH 0x0202
#define TAG_Y_CB_CR_COEFFICIENTS 0x0211
#define TAG_Y_CB_CR_SUB_SAMPLING 0x0212
#define TAG_Y_CB_CR_POSITIONING 0x0213
#define TAG_REFERENCE_BLACK_WHITE 0x0214
#define TAG_RELATED_IMAGE_WIDTH 0x1001
#define TAG_RELATED_IMAGE_LENGTH 0x1002
#define TAG_CFA_REPEAT_PATTERN_DIM 0x828D
#define TAG_CFA_PATTERN1 0x828E
#define TAG_BATTERY_LEVEL 0x828F
#define TAG_COPYRIGHT 0x8298
#define TAG_EXPOSURETIME 0x829A
#define TAG_FNUMBER 0x829D
#define TAG_IPTC_NAA 0x83BB
#define TAG_EXIF_OFFSET 0x8769
#define TAG_INTER_COLOR_PROFILE 0x8773
#define TAG_EXPOSURE_PROGRAM 0x8822
#define TAG_SPECTRAL_SENSITIVITY 0x8824
#define TAG_GPSINFO 0x8825
#define TAG_ISO_EQUIVALENT 0x8827
#define TAG_OECF 0x8828
#define TAG_EXIF_VERSION 0x9000
#define TAG_DATETIME_ORIGINAL 0x9003
#define TAG_DATETIME_DIGITIZED 0x9004
#define TAG_COMPONENTS_CONFIG 0x9101
#define TAG_CPRS_BITS_PER_PIXEL 0x9102
#define TAG_SHUTTERSPEED 0x9201
#define TAG_APERTURE 0x9202
#define TAG_BRIGHTNESS_VALUE 0x9203
#define TAG_EXPOSURE_BIAS 0x9204
#define TAG_MAXAPERTURE 0x9205
#define TAG_SUBJECT_DISTANCE 0x9206
#define TAG_METERING_MODE 0x9207
#define TAG_LIGHT_SOURCE 0x9208
#define TAG_FLASH 0x9209
#define TAG_FOCALLENGTH 0x920A
#define TAG_MAKER_NOTE 0x927C
#define TAG_USERCOMMENT 0x9286
#define TAG_SUBSEC_TIME 0x9290
#define TAG_SUBSEC_TIME_ORIG 0x9291
#define TAG_SUBSEC_TIME_DIG 0x9292
#define TAG_WINXP_TITLE 0x9c9b // Windows XP - not part of exif standard.
#define TAG_WINXP_COMMENT 0x9c9c // Windows XP - not part of exif standard.
#define TAG_WINXP_AUTHOR 0x9c9d // Windows XP - not part of exif standard.
#define TAG_WINXP_KEYWORDS 0x9c9e // Windows XP - not part of exif standard.
#define TAG_WINXP_SUBJECT 0x9c9f // Windows XP - not part of exif standard.
#define TAG_FLASH_PIX_VERSION 0xA000
#define TAG_COLOR_SPACE 0xA001
#define TAG_EXIF_IMAGEWIDTH 0xA002
#define TAG_EXIF_IMAGELENGTH 0xA003
#define TAG_RELATED_AUDIO_FILE 0xA004
#define TAG_INTEROP_OFFSET 0xA005
#define TAG_FLASH_ENERGY 0xA20B
#define TAG_SPATIAL_FREQ_RESP 0xA20C
#define TAG_FOCAL_PLANE_XRES 0xA20E
#define TAG_FOCAL_PLANE_YRES 0xA20F
#define TAG_FOCAL_PLANE_UNITS 0xA210
#define TAG_SUBJECT_LOCATION 0xA214
#define TAG_EXPOSURE_INDEX 0xA215
#define TAG_SENSING_METHOD 0xA217
#define TAG_FILE_SOURCE 0xA300
#define TAG_SCENE_TYPE 0xA301
#define TAG_CFA_PATTERN 0xA302
#define TAG_CUSTOM_RENDERED 0xA401
#define TAG_EXPOSURE_MODE 0xA402
#define TAG_WHITEBALANCE 0xA403
#define TAG_DIGITALZOOMRATIO 0xA404
#define TAG_FOCALLENGTH_35MM 0xA405
#define TAG_SCENE_CAPTURE_TYPE 0xA406
#define TAG_GAIN_CONTROL 0xA407
#define TAG_CONTRAST 0xA408
#define TAG_SATURATION 0xA409
#define TAG_SHARPNESS 0xA40A
#define TAG_DISTANCE_RANGE 0xA40C
// TODO: replace the ", 0" values in this table with the correct format, e.g. ", FMT_USHORT"
static const TagTable_t TagTable[] = {
{ TAG_INTEROP_INDEX, "InteropIndex", 0, 0},
{ TAG_INTEROP_VERSION, "InteropVersion", 0, 0},
{ TAG_IMAGE_WIDTH, "ImageWidth", FMT_USHORT, 1},
{ TAG_IMAGE_LENGTH, "ImageLength", FMT_USHORT, 1},
{ TAG_BITS_PER_SAMPLE, "BitsPerSample", FMT_USHORT, 3},
{ TAG_COMPRESSION, "Compression", FMT_USHORT, 1},
{ TAG_PHOTOMETRIC_INTERP, "PhotometricInterpretation", FMT_USHORT, 1},
{ TAG_FILL_ORDER, "FillOrder", 0, 0},
{ TAG_DOCUMENT_NAME, "DocumentName", 0, 0},
{ TAG_IMAGE_DESCRIPTION, "ImageDescription", 0, 0 },
{ TAG_MAKE, "Make", FMT_STRING, -1},
{ TAG_MODEL, "Model", FMT_STRING, -1},
{ TAG_SRIP_OFFSET, "StripOffsets", FMT_USHORT, 1},
{ TAG_ORIENTATION, "Orientation", FMT_USHORT, 1},
{ TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel", FMT_USHORT, 3},
{ TAG_ROWS_PER_STRIP, "RowsPerStrip", FMT_USHORT, 1},
{ TAG_STRIP_BYTE_COUNTS, "StripByteCounts", FMT_USHORT, 1},
{ TAG_X_RESOLUTION, "XResolution", FMT_URATIONAL, 1},
{ TAG_Y_RESOLUTION, "YResolution", FMT_URATIONAL, 1},
{ TAG_PLANAR_CONFIGURATION, "PlanarConfiguration", FMT_USHORT, 1},
{ TAG_RESOLUTION_UNIT, "ResolutionUnit", FMT_USHORT, 1},
{ TAG_TRANSFER_FUNCTION, "TransferFunction", FMT_USHORT, 768},
{ TAG_SOFTWARE, "Software", FMT_STRING, -1},
{ TAG_DATETIME, "DateTime", FMT_STRING, 20},
{ TAG_ARTIST, "Artist", FMT_STRING, -1},
{ TAG_WHITE_POINT, "WhitePoint", FMT_SRATIONAL, 2},
{ TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities", FMT_SRATIONAL, 6},
{ TAG_TRANSFER_RANGE, "TransferRange", 0, 0},
{ TAG_JPEG_PROC, "JPEGProc", 0, 0},
{ TAG_THUMBNAIL_OFFSET, "ThumbnailOffset", 0, 0},
{ TAG_THUMBNAIL_LENGTH, "ThumbnailLength", 0, 0},
{ TAG_Y_CB_CR_COEFFICIENTS, "YCbCrCoefficients", FMT_SRATIONAL, 3},
{ TAG_Y_CB_CR_SUB_SAMPLING, "YCbCrSubSampling", FMT_USHORT, 2},
{ TAG_Y_CB_CR_POSITIONING, "YCbCrPositioning", FMT_USHORT, 1},
{ TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite", FMT_SRATIONAL, 6},
{ TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth", 0, 0},
{ TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength", 0, 0},
{ TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim", 0, 0},
{ TAG_CFA_PATTERN1, "CFAPattern", 0, 0},
{ TAG_BATTERY_LEVEL, "BatteryLevel", 0, 0},
{ TAG_COPYRIGHT, "Copyright", FMT_STRING, -1},
{ TAG_EXPOSURETIME, "ExposureTime", FMT_SRATIONAL, 1},
{ TAG_FNUMBER, "FNumber", FMT_SRATIONAL, 1},
{ TAG_IPTC_NAA, "IPTC/NAA", 0, 0},
{ TAG_EXIF_OFFSET, "ExifOffset", 0, 0},
{ TAG_INTER_COLOR_PROFILE, "InterColorProfile", 0, 0},
{ TAG_EXPOSURE_PROGRAM, "ExposureProgram", FMT_SSHORT, 1},
{ TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity", FMT_STRING, -1},
{ TAG_GPSINFO, "GPS Dir offset", 0, 0},
{ TAG_ISO_EQUIVALENT, "ISOSpeedRatings", FMT_SSHORT, -1},
{ TAG_OECF, "OECF", 0, 0},
{ TAG_EXIF_VERSION, "ExifVersion", FMT_BYTE, 4},
{ TAG_DATETIME_ORIGINAL, "DateTimeOriginal", FMT_STRING, 20},
{ TAG_DATETIME_DIGITIZED, "DateTimeDigitized", FMT_STRING, 20},
{ TAG_COMPONENTS_CONFIG, "ComponentsConfiguration", FMT_BYTE, 4},
{ TAG_CPRS_BITS_PER_PIXEL, "CompressedBitsPerPixel", FMT_SRATIONAL, 1},
{ TAG_SHUTTERSPEED, "ShutterSpeedValue", FMT_SRATIONAL, 1},
{ TAG_APERTURE, "ApertureValue", FMT_URATIONAL, 1},
{ TAG_BRIGHTNESS_VALUE, "BrightnessValue", FMT_SRATIONAL, 1},
{ TAG_EXPOSURE_BIAS, "ExposureBiasValue", FMT_SRATIONAL, 1},
{ TAG_MAXAPERTURE, "MaxApertureValue", FMT_URATIONAL, 1},
{ TAG_SUBJECT_DISTANCE, "SubjectDistance", FMT_URATIONAL, 1},
{ TAG_METERING_MODE, "MeteringMode", FMT_USHORT, 1},
{ TAG_LIGHT_SOURCE, "LightSource", FMT_USHORT, 1},
{ TAG_FLASH, "Flash", FMT_USHORT, 1},
{ TAG_FOCALLENGTH, "FocalLength", FMT_URATIONAL, 1},
{ TAG_MAKER_NOTE, "MakerNote", FMT_STRING, -1},
{ TAG_USERCOMMENT, "UserComment", FMT_STRING, -1},
{ TAG_SUBSEC_TIME, "SubSecTime", FMT_STRING, -1},
{ TAG_SUBSEC_TIME_ORIG, "SubSecTimeOriginal", FMT_STRING, -1},
{ TAG_SUBSEC_TIME_DIG, "SubSecTimeDigitized", FMT_STRING, -1},
{ TAG_WINXP_TITLE, "Windows-XP Title", 0, 0},
{ TAG_WINXP_COMMENT, "Windows-XP comment", 0, 0},
{ TAG_WINXP_AUTHOR, "Windows-XP author", 0, 0},
{ TAG_WINXP_KEYWORDS, "Windows-XP keywords", 0, 0},
{ TAG_WINXP_SUBJECT, "Windows-XP subject", 0, 0},
{ TAG_FLASH_PIX_VERSION, "FlashPixVersion", FMT_BYTE, 4},
{ TAG_COLOR_SPACE, "ColorSpace", FMT_USHORT, 1},
{ TAG_EXIF_IMAGEWIDTH, "ExifImageWidth", 0, 0},
{ TAG_EXIF_IMAGELENGTH, "ExifImageLength", 0, 0},
{ TAG_RELATED_AUDIO_FILE, "RelatedAudioFile", 0, 0},
{ TAG_INTEROP_OFFSET, "InteroperabilityOffset", 0, 0},
{ TAG_FLASH_ENERGY, "FlashEnergy", FMT_URATIONAL, 1},
{ TAG_SPATIAL_FREQ_RESP, "SpatialFrequencyResponse", FMT_STRING, -1},
{ TAG_FOCAL_PLANE_XRES, "FocalPlaneXResolution", FMT_URATIONAL, 1},
{ TAG_FOCAL_PLANE_YRES, "FocalPlaneYResolution", FMT_URATIONAL, 1},
{ TAG_FOCAL_PLANE_UNITS, "FocalPlaneResolutionUnit", FMT_USHORT, 1},
{ TAG_SUBJECT_LOCATION, "SubjectLocation", FMT_USHORT, 2},
{ TAG_EXPOSURE_INDEX, "ExposureIndex", FMT_URATIONAL, 1},
{ TAG_SENSING_METHOD, "SensingMethod", FMT_USHORT, 1},
{ TAG_FILE_SOURCE, "FileSource", 0, 1},
{ TAG_SCENE_TYPE, "SceneType", 0, 1},
{ TAG_CFA_PATTERN, "CFA Pattern", 0, -1},
{ TAG_CUSTOM_RENDERED, "CustomRendered", FMT_USHORT, 1},
{ TAG_EXPOSURE_MODE, "ExposureMode", FMT_USHORT, 1},
{ TAG_WHITEBALANCE, "WhiteBalance", FMT_USHORT, 1},
{ TAG_DIGITALZOOMRATIO, "DigitalZoomRatio", FMT_URATIONAL, 1},
{ TAG_FOCALLENGTH_35MM, "FocalLengthIn35mmFilm", FMT_USHORT, 1},
{ TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType", FMT_USHORT, 1},
{ TAG_GAIN_CONTROL, "GainControl", FMT_URATIONAL, 1},
{ TAG_CONTRAST, "Contrast", FMT_USHORT, 1},
{ TAG_SATURATION, "Saturation", FMT_USHORT, 1},
{ TAG_SHARPNESS, "Sharpness", FMT_USHORT, 1},
{ TAG_DISTANCE_RANGE, "SubjectDistanceRange", FMT_USHORT, 1},
} ;
#define TAG_TABLE_SIZE (sizeof(TagTable) / sizeof(TagTable_t))
int TagNameToValue(const char* tagName)
{
unsigned int i;
for (i = 0; i < TAG_TABLE_SIZE; i++) {
if (strcmp(TagTable[i].Desc, tagName) == 0) {
printf("found tag %s val %d", TagTable[i].Desc, TagTable[i].Tag);
return TagTable[i].Tag;
}
}
printf("tag %s NOT FOUND", tagName);
return -1;
}
int IsDateTimeTag(unsigned short tag)
{
return ((tag == TAG_DATETIME)? TRUE: FALSE);
}
//--------------------------------------------------------------------------
// Convert a 16 bit unsigned value to file's native byte order
//--------------------------------------------------------------------------
static void Put16u(void * Short, unsigned short PutValue)
{
if (MotorolaOrder){
((uchar *)Short)[0] = (uchar)(PutValue>>8);
((uchar *)Short)[1] = (uchar)PutValue;
}else{
((uchar *)Short)[0] = (uchar)PutValue;
((uchar *)Short)[1] = (uchar)(PutValue>>8);
}
}
//--------------------------------------------------------------------------
// Convert a 16 bit unsigned value from file's native byte order
//--------------------------------------------------------------------------
int Get16u(void * Short)
{
if (MotorolaOrder){
return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
}else{
return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit signed value from file's native byte order
//--------------------------------------------------------------------------
int Get32s(void * Long)
{
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 );
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit unsigned value to file's native byte order
//--------------------------------------------------------------------------
void Put32u(void * Value, unsigned PutValue)
{
if (MotorolaOrder){
((uchar *)Value)[0] = (uchar)(PutValue>>24);
((uchar *)Value)[1] = (uchar)(PutValue>>16);
((uchar *)Value)[2] = (uchar)(PutValue>>8);
((uchar *)Value)[3] = (uchar)PutValue;
}else{
((uchar *)Value)[0] = (uchar)PutValue;
((uchar *)Value)[1] = (uchar)(PutValue>>8);
((uchar *)Value)[2] = (uchar)(PutValue>>16);
((uchar *)Value)[3] = (uchar)(PutValue>>24);
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit unsigned value from file's native byte order
//--------------------------------------------------------------------------
unsigned Get32u(void * Long)
{
return (unsigned)Get32s(Long) & 0xffffffff;
}
//--------------------------------------------------------------------------
// Convert a 64 bit signed value from file's native byte order
//--------------------------------------------------------------------------
long long Get64s(void * LLong)
{
uchar * ValuePtr = (uchar *)LLong;
if (MotorolaOrder){
return (((long long)ValuePtr[0]) << 56) | (((ullong)ValuePtr[1]) << 48)
| ((( ullong)ValuePtr[2]) << 40) | (((ullong)ValuePtr[3]) << 32)
| ((( ullong)ValuePtr[4]) << 24) | (((ullong)ValuePtr[5]) << 16)
| ((( ullong)ValuePtr[6]) << 8 ) | (((ullong)ValuePtr[7]) << 0 );
}else{
return (((long long)ValuePtr[7]) << 56) | (((ullong)ValuePtr[6]) << 48)
| ((( ullong)ValuePtr[5]) << 40) | (((ullong)ValuePtr[4]) << 32)
| ((( ullong)ValuePtr[3]) << 24) | (((ullong)ValuePtr[2]) << 16)
| ((( ullong)ValuePtr[1]) << 8 ) | (((ullong)ValuePtr[0]) << 0 );
}
}
//--------------------------------------------------------------------------
// Convert a 64 bit double value from signed long long value
//--------------------------------------------------------------------------
double Get64d(void * Double)
{
union {
double ret;
long long var;
}data;
data.var = Get64s(Double);
return data.ret;
}
//--------------------------------------------------------------------------
// Convert a 32 bit float value from signed int value
//--------------------------------------------------------------------------
float Get32f(void * Float)
{
union {
float ret;
int var;
}data;
data.var = Get32s(Float);
return data.ret;
}
//--------------------------------------------------------------------------
// Display a number as one of its many formats
//--------------------------------------------------------------------------
void PrintFormatNumber(void * ValuePtr, int Format, int ByteCount)
{
int s,n;
for(n=0;n<16;n++){
switch(Format){
case FMT_SBYTE:
case FMT_BYTE: printf("%02x",*(uchar *)ValuePtr); s=1; break;
case FMT_USHORT: printf("%d",Get16u(ValuePtr)); s=2; break;
case FMT_ULONG:
case FMT_SLONG: printf("%d",Get32s(ValuePtr)); s=4; break;
case FMT_SSHORT: printf("%hd",(signed short)Get16u(ValuePtr)); s=2; break;
case FMT_URATIONAL:
case FMT_SRATIONAL:
printf("%d/%d",Get32s(ValuePtr), Get32s(4+(char *)ValuePtr));
s = 8;
break;
case FMT_SINGLE: printf("%f",Get32f(ValuePtr)); s=4; break;
case FMT_DOUBLE: printf("%f",Get64d(ValuePtr)); s=8; break;
default:
printf("Unknown format %d:", Format);
return;
}
ByteCount -= s;
if (ByteCount <= 0) break;
printf(", ");
ValuePtr = (void *)((char *)ValuePtr + s);
}
if (n >= 16) printf("...");
}
//--------------------------------------------------------------------------
// Evaluate number, be it int, rational, or float from directory.
//--------------------------------------------------------------------------
double ConvertAnyFormat(void * ValuePtr, int Format)
{
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); break;
case FMT_ULONG: Value = Get32u(ValuePtr); break;
case FMT_URATIONAL:
case FMT_SRATIONAL:
{
int Num,Den;
Num = Get32s(ValuePtr);
Den = Get32s(4+(char *)ValuePtr);
if (Den == 0){
Value = 0;
}else{
Value = (double)Num/Den;
}
break;
}
case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr); break;
case FMT_SLONG: Value = Get32s(ValuePtr); break;
case FMT_SINGLE: Value = Get32f(ValuePtr); break;
case FMT_DOUBLE: Value = Get64d(ValuePtr); break;
default:
ErrNonfatal("Illegal format code %d",Format,0);
}
return Value;
}
//--------------------------------------------------------------------------
// Convert a double value into a signed or unsigned rational number.
//--------------------------------------------------------------------------
static void float2urat(double value, unsigned int max, unsigned int *numerator,
unsigned int *denominator) {
if (value <= 0) {
*numerator = 0;
*denominator = 1;
return;
}
if (value > max) {
*numerator = max;
*denominator = 1;
return;
}
// For values less than 1e-9, scale as much as possible
if (value < 1e-9) {
unsigned int n = (unsigned int)(value * max);
if (n == 0) {
*numerator = 0;
*denominator = 1;
} else {
*numerator = n;
*denominator = max;
}
return;
}
// Try to use a denominator of 1e9, 1e8, ..., until the numerator fits
unsigned int d;
for (d = 1000000000; d >= 1; d /= 10) {
double s = value * d;
if (s <= max) {
// Remove the trailing zeros from both.
unsigned int n = (unsigned int)s;
while (n % 10 == 0 && d >= 10) {
n /= 10;
d /= 10;
}
*numerator = n;
*denominator = d;
return;
}
}
// Shouldn't reach here because the denominator 1 should work
// above. But just in case.
*numerator = 0;
*denominator = 1;
}
static void ConvertDoubleToURational(double value, unsigned int *numerator,
unsigned int *denominator) {
float2urat(value, 0xFFFFFFFFU, numerator, denominator);
}
static void ConvertDoubleToSRational(double value, int *numerator,
int *denominator) {
int negative = 0;
if (value < 0) {
value = -value;
negative = 1;
}
unsigned int n, d;
float2urat(value, 0x7FFFFFFFU, &n, &d);
*numerator = (int)n;
*denominator = (int)d;
if (negative) {
*numerator = -*numerator;
}
}
//--------------------------------------------------------------------------
// Process one of the nested EXIF directories.
//--------------------------------------------------------------------------
static void ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase,
unsigned ExifLength, int NestingLevel)
{
int de;
int a;
int NumDirEntries;
unsigned ThumbnailOffset = 0;
unsigned ThumbnailSize = 0;
char IndentString[25];
printf("ProcessExifDir");
if (NestingLevel > 4){
ErrNonfatal("Maximum directory nesting exceeded (corrupt exif header)", 0,0);
return;
}
memset(IndentString, ' ', 25);
IndentString[NestingLevel * 4] = '\0';
NumDirEntries = Get16u(DirStart);
#define DIR_ENTRY_ADDR(Start, Entry) (Start+2+12*(Entry))
{
unsigned char * DirEnd;
DirEnd = DIR_ENTRY_ADDR(DirStart, NumDirEntries);
if (DirEnd+4 > (OffsetBase+ExifLength)){
if (DirEnd+2 == OffsetBase+ExifLength || DirEnd == OffsetBase+ExifLength){
// Version 1.3 of jhead would truncate a bit too much.
// This also caught later on as well.
}else{
ErrNonfatal("Illegally sized exif subdirectory (%d entries)",NumDirEntries,0);
return;
}
}
if (DumpExifMap){
printf("Map: %05d-%05d: Directory\n",(int)(DirStart-OffsetBase), (int)(DirEnd+4-OffsetBase));
}
}
if (ShowTags){
printf("(dir has %d entries)\n",NumDirEntries);
}
for (de=0;de<NumDirEntries;de++){
int Tag, Format, Components;
unsigned char * ValuePtr;
int ByteCount;
unsigned char * DirEntry;
DirEntry = DIR_ENTRY_ADDR(DirStart, de);
Tag = Get16u(DirEntry);
Format = Get16u(DirEntry+2);
Components = Get32u(DirEntry+4);
if ((Format-1) >= NUM_FORMATS) {
// (-1) catches illegal zero case as unsigned underflows to positive large.
ErrNonfatal("Illegal number format %d for tag %04x", Format, Tag);
continue;
}
if ((unsigned)Components > 0x10000){
ErrNonfatal("Illegal number of components %d for tag %04x", Components, Tag);
continue;
}
ByteCount = Components * BytesPerFormat[Format];
if (ByteCount > 4){
unsigned OffsetVal;
OffsetVal = Get32u(DirEntry+8);
// If its bigger than 4 bytes, the dir entry contains an offset.
if (OffsetVal > UINT32_MAX - ByteCount || OffsetVal+ByteCount > ExifLength){
// Bogus pointer offset and / or bytecount value
ErrNonfatal("Illegal value pointer for tag %04x", Tag,0);
continue;
}
ValuePtr = OffsetBase+OffsetVal;
if (OffsetVal > ImageInfo.LargestExifOffset){
ImageInfo.LargestExifOffset = OffsetVal;
}
if (DumpExifMap){
printf("Map: %05d-%05d: Data for tag %04x\n",OffsetVal, OffsetVal+ByteCount, Tag);
}
}else{
// 4 bytes or less and value is in the dir entry itself
ValuePtr = DirEntry+8;
}
if (Tag == TAG_MAKER_NOTE){
if (ShowTags){
printf("%s Maker note: ",IndentString);
}
ProcessMakerNote(ValuePtr, ByteCount, OffsetBase, ExifLength);
continue;
}
if (ShowTags){
// Show tag name
for (a=0;;a++){
if (a >= (int)TAG_TABLE_SIZE){
printf("%s", IndentString);
printf(" Unknown Tag %04x Value = ", Tag);
break;
}
if (TagTable[a].Tag == Tag){
printf("%s", IndentString);
printf(" %s = ",TagTable[a].Desc);
break;
}
}
// Show tag value.
switch(Format){
case FMT_BYTE:
if(ByteCount>1){
printf("%.*ls\n", ByteCount/2, (wchar_t *)ValuePtr);
}else{
PrintFormatNumber(ValuePtr, Format, ByteCount);
printf("\n");
}
break;
case FMT_UNDEFINED:
// Undefined is typically an ascii string.
case FMT_STRING:
// String arrays printed without function call (different from int arrays)
{
printf("\"%s\"", ValuePtr);
// int NoPrint = 0;
// printf("\"");
// for (a=0;a<ByteCount;a++){
// if (ValuePtr[a] >= 32){
// putchar(ValuePtr[a]);
// NoPrint = 0;
// }else{
// // Avoiding indicating too many unprintable characters of proprietary
// // bits of binary information this program may not know how to parse.
// if (!NoPrint && a != ByteCount-1){
// putchar('?');
// NoPrint = 1;
// }
// }
// }
// printf("\"\n");
}
break;
default:
// Handle arrays of numbers later (will there ever be?)
PrintFormatNumber(ValuePtr, Format, ByteCount);
printf("\n");
}
}
// Extract useful components of tag
switch(Tag){
case TAG_MAKE:
strncpy(ImageInfo.CameraMake, (char *)ValuePtr, ByteCount < 31 ? ByteCount : 31);
break;
case TAG_MODEL:
strncpy(ImageInfo.CameraModel, (char *)ValuePtr, ByteCount < 39 ? ByteCount : 39);
break;
case TAG_SUBSEC_TIME:
strlcpy(ImageInfo.SubSecTime, (char *)ValuePtr, sizeof(ImageInfo.SubSecTime));
break;
case TAG_SUBSEC_TIME_ORIG:
strlcpy(ImageInfo.SubSecTimeOrig, (char *)ValuePtr,
sizeof(ImageInfo.SubSecTimeOrig));
break;
case TAG_SUBSEC_TIME_DIG:
strlcpy(ImageInfo.SubSecTimeDig, (char *)ValuePtr,
sizeof(ImageInfo.SubSecTimeDig));
break;
case TAG_DATETIME_DIGITIZED:
strlcpy(ImageInfo.DigitizedTime, (char *)ValuePtr,
sizeof(ImageInfo.DigitizedTime));
if (ImageInfo.numDateTimeTags >= MAX_DATE_COPIES){
ErrNonfatal("More than %d date fields! This is nuts", MAX_DATE_COPIES, 0);
break;
}
ImageInfo.DateTimeOffsets[ImageInfo.numDateTimeTags++] =
(char *)ValuePtr - (char *)OffsetBase;
break;
case TAG_DATETIME_ORIGINAL:
// If we get a DATETIME_ORIGINAL, we use that one.
strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
// Fallthru...
case TAG_DATETIME:
if (!isdigit(ImageInfo.DateTime[0])){
// If we don't already have a DATETIME_ORIGINAL, use whatever
// time fields we may have.
strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
}
if (ImageInfo.numDateTimeTags >= MAX_DATE_COPIES){
ErrNonfatal("More than %d date fields! This is nuts", MAX_DATE_COPIES, 0);
break;
}
ImageInfo.DateTimeOffsets[ImageInfo.numDateTimeTags++] =
(char *)ValuePtr - (char *)OffsetBase;
break;
case TAG_WINXP_COMMENT:
if (ImageInfo.Comments[0]){ // We already have a jpeg comment.
// Already have a comment (probably windows comment), skip this one.
if (ShowTags) printf("Windows XP commend and other comment in header\n");
break; // Already have a windows comment, skip this one.
}
if (ByteCount > 1){
if (ByteCount > MAX_COMMENT_SIZE) ByteCount = MAX_COMMENT_SIZE;
memcpy(ImageInfo.Comments, ValuePtr, ByteCount);
ImageInfo.CommentWidchars = ByteCount/2;
}
break;
case TAG_USERCOMMENT:
if (ImageInfo.Comments[0]){ // We already have a jpeg comment.
// Already have a comment (probably windows comment), skip this one.
if (ShowTags) printf("Multiple comments in exif header\n");
break; // Already have a windows comment, skip this one.
}
// Comment is often 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
{
// We want to set copied comment length (msize) to be the
// minimum of:
// (1) The space still available in Exif
// (2) The given comment length (ByteCount)
// (3) MAX_COMMENT_SIZE - 1
int msiz = ExifLength - (ValuePtr-OffsetBase);
if (msiz > ByteCount) msiz = ByteCount;
if (msiz > MAX_COMMENT_SIZE - 1) msiz = MAX_COMMENT_SIZE - 1;
if (msiz > 5 && memcmp(ValuePtr, "ASCII", 5) == 0) {
for (a = 5; a < 10 && a < msiz; a++) {
int c = (ValuePtr)[a];
if (c != '\0' && c != ' ') {
strncpy(ImageInfo.Comments,
(char *)ValuePtr + a, msiz - a);
break;
}
}
} else {
strncpy(ImageInfo.Comments, (char *)ValuePtr, msiz);
}
}
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);
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)*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.num = Get32u(ValuePtr);
ImageInfo.FocalLength.denom = Get32u(4+(char *)ValuePtr);
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);
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);
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)*log(2)));
}
break;
case TAG_FLASH:
ImageInfo.FlashUsed=(int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_ORIENTATION:
if (NumOrientations >= 2){
// Can have another orientation tag for the thumbnail, but if there's
// a third one, things are stringae.
ErrNonfatal("More than two orientation tags!",0,0);
break;
}
OrientationPtr[NumOrientations] = ValuePtr;
OrientationNumFormat[NumOrientations] = Format;
if (NumOrientations == 0){
ImageInfo.Orientation = (int)ConvertAnyFormat(ValuePtr, Format);
}
if (ImageInfo.Orientation < 0 || ImageInfo.Orientation > 8){
ErrNonfatal("Undefined rotation value %d", ImageInfo.Orientation, 0);
ImageInfo.Orientation = 0;
}
NumOrientations += 1;
break;
case TAG_EXIF_IMAGELENGTH:
case TAG_EXIF_IMAGEWIDTH:
// Use largest of height and width to deal with images that have been
// rotated to portrait format.
a = (int)ConvertAnyFormat(ValuePtr, Format);
if (ExifImageWidth < a) ExifImageWidth = a;
break;
case TAG_FOCAL_PLANE_XRES:
FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_FOCAL_PLANE_UNITS:
switch((int)ConvertAnyFormat(ValuePtr, Format)){
case 1: FocalplaneUnits = 25.4; break; // inch
case 2:
// According to the information I was using, 2 means meters.
// But looking at the Cannon powershot's files, inches is the only
// sensible value.
FocalplaneUnits = 25.4;
break;
case 3: FocalplaneUnits = 10; break; // centimeter
case 4: FocalplaneUnits = 1; break; // millimeter
case 5: FocalplaneUnits = .001; break; // micrometer
}
break;
case TAG_EXPOSURE_BIAS:
ImageInfo.ExposureBias = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_WHITEBALANCE:
ImageInfo.Whitebalance = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_LIGHT_SOURCE:
ImageInfo.LightSource = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_METERING_MODE:
ImageInfo.MeteringMode = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURE_PROGRAM:
ImageInfo.ExposureProgram = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURE_INDEX:
if (ImageInfo.ISOequivalent == 0){
// Exposure index and ISO equivalent are often used interchangeably,
// so we will do the same in jhead.
// http://photography.about.com/library/glossary/bldef_ei.htm
ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
}
break;
case TAG_EXPOSURE_MODE:
ImageInfo.ExposureMode = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_ISO_EQUIVALENT:
ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_DIGITALZOOMRATIO:
ImageInfo.DigitalZoomRatio = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_THUMBNAIL_OFFSET:
ThumbnailOffset = (unsigned)ConvertAnyFormat(ValuePtr, Format);
DirWithThumbnailPtrs = DirStart;