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android / platform / frameworks / base / 72b6e76 / . / media / java / android / media / ExifInterface.java
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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.util.Pair;
import libcore.io.IoUtils;
import libcore.io.Streams;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This is a class for reading and writing Exif tags in a JPEG file.
*/
public class ExifInterface {
private static final String TAG = "ExifInterface";
private static final boolean DEBUG = false;
// The Exif tag names
/** Type is String. @hide */
public static final String TAG_ARTIST = "Artist";
/** Type is int. @hide */
public static final String TAG_BITS_PER_SAMPLE = "BitsPerSample";
/** Type is int. @hide */
public static final String TAG_COMPRESSION = "Compression";
/** Type is String. @hide */
public static final String TAG_COPYRIGHT = "Copyright";
/** Type is String. */
public static final String TAG_DATETIME = "DateTime";
/** Type is String. @hide */
public static final String TAG_IMAGE_DESCRIPTION = "ImageDescription";
/** Type is int. */
public static final String TAG_IMAGE_LENGTH = "ImageLength";
/** Type is int. */
public static final String TAG_IMAGE_WIDTH = "ImageWidth";
/** Type is int. @hide */
public static final String TAG_JPEG_INTERCHANGE_FORMAT = "JPEGInterchangeFormat";
/** Type is int. @hide */
public static final String TAG_JPEG_INTERCHANGE_FORMAT_LENGTH = "JPEGInterchangeFormatLength";
/** Type is String. */
public static final String TAG_MAKE = "Make";
/** Type is String. */
public static final String TAG_MODEL = "Model";
/** Type is int. */
public static final String TAG_ORIENTATION = "Orientation";
/** Type is int. @hide */
public static final String TAG_PHOTOMETRIC_INTERPRETATION = "PhotometricInterpretation";
/** Type is int. @hide */
public static final String TAG_PLANAR_CONFIGURATION = "PlanarConfiguration";
/** Type is rational. @hide */
public static final String TAG_PRIMARY_CHROMATICITIES = "PrimaryChromaticities";
/** Type is rational. @hide */
public static final String TAG_REFERENCE_BLACK_WHITE = "ReferenceBlackWhite";
/** Type is int. @hide */
public static final String TAG_RESOLUTION_UNIT = "ResolutionUnit";
/** Type is int. @hide */
public static final String TAG_ROWS_PER_STRIP = "RowsPerStrip";
/** Type is int. @hide */
public static final String TAG_SAMPLES_PER_PIXEL = "SamplesPerPixel";
/** Type is String. @hide */
public static final String TAG_SOFTWARE = "Software";
/** Type is int. @hide */
public static final String TAG_STRIP_BYTE_COUNTS = "StripByteCounts";
/** Type is int. @hide */
public static final String TAG_STRIP_OFFSETS = "StripOffsets";
/** Type is int. @hide */
public static final String TAG_TRANSFER_FUNCTION = "TransferFunction";
/** Type is rational. @hide */
public static final String TAG_WHITE_POINT = "WhitePoint";
/** Type is rational. @hide */
public static final String TAG_X_RESOLUTION = "XResolution";
/** Type is rational. @hide */
public static final String TAG_Y_CB_CR_COEFFICIENTS = "YCbCrCoefficients";
/** Type is int. @hide */
public static final String TAG_Y_CB_CR_POSITIONING = "YCbCrPositioning";
/** Type is int. @hide */
public static final String TAG_Y_CB_CR_SUB_SAMPLING = "YCbCrSubSampling";
/** Type is rational. @hide */
public static final String TAG_Y_RESOLUTION = "YResolution";
/** Type is rational. @hide */
public static final String TAG_APERTURE_VALUE = "ApertureValue";
/** Type is rational. @hide */
public static final String TAG_BRIGHTNESS_VALUE = "BrightnessValue";
/** Type is String. @hide */
public static final String TAG_CFA_PATTERN = "CFAPattern";
/** Type is int. @hide */
public static final String TAG_COLOR_SPACE = "ColorSpace";
/** Type is String. @hide */
public static final String TAG_COMPONENTS_CONFIGURATION = "ComponentsConfiguration";
/** Type is rational. @hide */
public static final String TAG_COMPRESSED_BITS_PER_PIXEL = "CompressedBitsPerPixel";
/** Type is int. @hide */
public static final String TAG_CONTRAST = "Contrast";
/** Type is int. @hide */
public static final String TAG_CUSTOM_RENDERED = "CustomRendered";
/** Type is String. */
public static final String TAG_DATETIME_DIGITIZED = "DateTimeDigitized";
/** Type is String. @hide */
public static final String TAG_DATETIME_ORIGINAL = "DateTimeOriginal";
/** Type is String. @hide */
public static final String TAG_DEVICE_SETTING_DESCRIPTION = "DeviceSettingDescription";
/** Type is double. @hide */
public static final String TAG_DIGITAL_ZOOM_RATIO = "DigitalZoomRatio";
/** Type is String. @hide */
public static final String TAG_EXIF_VERSION = "ExifVersion";
/** Type is double. @hide */
public static final String TAG_EXPOSURE_BIAS_VALUE = "ExposureBiasValue";
/** Type is rational. @hide */
public static final String TAG_EXPOSURE_INDEX = "ExposureIndex";
/** Type is int. @hide */
public static final String TAG_EXPOSURE_MODE = "ExposureMode";
/** Type is int. @hide */
public static final String TAG_EXPOSURE_PROGRAM = "ExposureProgram";
/** Type is double. */
public static final String TAG_EXPOSURE_TIME = "ExposureTime";
/** Type is double. */
public static final String TAG_APERTURE = "FNumber";
/** Type is String. @hide */
public static final String TAG_FILE_SOURCE = "FileSource";
/** Type is int. */
public static final String TAG_FLASH = "Flash";
/** Type is rational. @hide */
public static final String TAG_FLASH_ENERGY = "FlashEnergy";
/** Type is String. @hide */
public static final String TAG_FLASHPIX_VERSION = "FlashpixVersion";
/** Type is rational. */
public static final String TAG_FOCAL_LENGTH = "FocalLength";
/** Type is int. @hide */
public static final String TAG_FOCAL_LENGTH_IN_35MM_FILM = "FocalLengthIn35mmFilm";
/** Type is int. @hide */
public static final String TAG_FOCAL_PLANE_RESOLUTION_UNIT = "FocalPlaneResolutionUnit";
/** Type is rational. @hide */
public static final String TAG_FOCAL_PLANE_X_RESOLUTION = "FocalPlaneXResolution";
/** Type is rational. @hide */
public static final String TAG_FOCAL_PLANE_Y_RESOLUTION = "FocalPlaneYResolution";
/** Type is int. @hide */
public static final String TAG_GAIN_CONTROL = "GainControl";
/** Type is int. */
public static final String TAG_ISO = "ISOSpeedRatings";
/** Type is String. @hide */
public static final String TAG_IMAGE_UNIQUE_ID = "ImageUniqueID";
/** Type is int. @hide */
public static final String TAG_LIGHT_SOURCE = "LightSource";
/** Type is String. @hide */
public static final String TAG_MAKER_NOTE = "MakerNote";
/** Type is rational. @hide */
public static final String TAG_MAX_APERTURE_VALUE = "MaxApertureValue";
/** Type is int. @hide */
public static final String TAG_METERING_MODE = "MeteringMode";
/** Type is String. @hide */
public static final String TAG_OECF = "OECF";
/** Type is int. @hide */
public static final String TAG_PIXEL_X_DIMENSION = "PixelXDimension";
/** Type is int. @hide */
public static final String TAG_PIXEL_Y_DIMENSION = "PixelYDimension";
/** Type is String. @hide */
public static final String TAG_RELATED_SOUND_FILE = "RelatedSoundFile";
/** Type is int. @hide */
public static final String TAG_SATURATION = "Saturation";
/** Type is int. @hide */
public static final String TAG_SCENE_CAPTURE_TYPE = "SceneCaptureType";
/** Type is String. @hide */
public static final String TAG_SCENE_TYPE = "SceneType";
/** Type is int. @hide */
public static final String TAG_SENSING_METHOD = "SensingMethod";
/** Type is int. @hide */
public static final String TAG_SHARPNESS = "Sharpness";
/** Type is rational. @hide */
public static final String TAG_SHUTTER_SPEED_VALUE = "ShutterSpeedValue";
/** Type is String. @hide */
public static final String TAG_SPATIAL_FREQUENCY_RESPONSE = "SpatialFrequencyResponse";
/** Type is String. @hide */
public static final String TAG_SPECTRAL_SENSITIVITY = "SpectralSensitivity";
/** Type is String. */
public static final String TAG_SUBSEC_TIME = "SubSecTime";
/** Type is String. */
public static final String TAG_SUBSEC_TIME_DIG = "SubSecTimeDigitized";
/** Type is String. */
public static final String TAG_SUBSEC_TIME_ORIG = "SubSecTimeOriginal";
/** Type is int. @hide */
public static final String TAG_SUBJECT_AREA = "SubjectArea";
/** Type is double. @hide */
public static final String TAG_SUBJECT_DISTANCE = "SubjectDistance";
/** Type is int. @hide */
public static final String TAG_SUBJECT_DISTANCE_RANGE = "SubjectDistanceRange";
/** Type is int. @hide */
public static final String TAG_SUBJECT_LOCATION = "SubjectLocation";
/** Type is String. @hide */
public static final String TAG_USER_COMMENT = "UserComment";
/** Type is int. */
public static final String TAG_WHITE_BALANCE = "WhiteBalance";
/**
* The altitude (in meters) based on the reference in TAG_GPS_ALTITUDE_REF.
* Type is rational.
*/
public static final String TAG_GPS_ALTITUDE = "GPSAltitude";
/**
* 0 if the altitude is above sea level. 1 if the altitude is below sea
* level. Type is int.
*/
public static final String TAG_GPS_ALTITUDE_REF = "GPSAltitudeRef";
/** Type is String. @hide */
public static final String TAG_GPS_AREA_INFORMATION = "GPSAreaInformation";
/** Type is rational. @hide */
public static final String TAG_GPS_DOP = "GPSDOP";
/** Type is String. */
public static final String TAG_GPS_DATESTAMP = "GPSDateStamp";
/** Type is rational. @hide */
public static final String TAG_GPS_DEST_BEARING = "GPSDestBearing";
/** Type is String. @hide */
public static final String TAG_GPS_DEST_BEARING_REF = "GPSDestBearingRef";
/** Type is rational. @hide */
public static final String TAG_GPS_DEST_DISTANCE = "GPSDestDistance";
/** Type is String. @hide */
public static final String TAG_GPS_DEST_DISTANCE_REF = "GPSDestDistanceRef";
/** Type is rational. @hide */
public static final String TAG_GPS_DEST_LATITUDE = "GPSDestLatitude";
/** Type is String. @hide */
public static final String TAG_GPS_DEST_LATITUDE_REF = "GPSDestLatitudeRef";
/** Type is rational. @hide */
public static final String TAG_GPS_DEST_LONGITUDE = "GPSDestLongitude";
/** Type is String. @hide */
public static final String TAG_GPS_DEST_LONGITUDE_REF = "GPSDestLongitudeRef";
/** Type is int. @hide */
public static final String TAG_GPS_DIFFERENTIAL = "GPSDifferential";
/** Type is rational. @hide */
public static final String TAG_GPS_IMG_DIRECTION = "GPSImgDirection";
/** Type is String. @hide */
public static final String TAG_GPS_IMG_DIRECTION_REF = "GPSImgDirectionRef";
/** Type is rational. Format is "num1/denom1,num2/denom2,num3/denom3". */
public static final String TAG_GPS_LATITUDE = "GPSLatitude";
/** Type is String. */
public static final String TAG_GPS_LATITUDE_REF = "GPSLatitudeRef";
/** Type is rational. Format is "num1/denom1,num2/denom2,num3/denom3". */
public static final String TAG_GPS_LONGITUDE = "GPSLongitude";
/** Type is String. */
public static final String TAG_GPS_LONGITUDE_REF = "GPSLongitudeRef";
/** Type is String. @hide */
public static final String TAG_GPS_MAP_DATUM = "GPSMapDatum";
/** Type is String. @hide */
public static final String TAG_GPS_MEASURE_MODE = "GPSMeasureMode";
/** Type is String. Name of GPS processing method used for location finding. */
public static final String TAG_GPS_PROCESSING_METHOD = "GPSProcessingMethod";
/** Type is String. @hide */
public static final String TAG_GPS_SATELLITES = "GPSSatellites";
/** Type is rational. @hide */
public static final String TAG_GPS_SPEED = "GPSSpeed";
/** Type is String. @hide */
public static final String TAG_GPS_SPEED_REF = "GPSSpeedRef";
/** Type is String. @hide */
public static final String TAG_GPS_STATUS = "GPSStatus";
/** Type is String. Format is "hh:mm:ss". */
public static final String TAG_GPS_TIMESTAMP = "GPSTimeStamp";
/** Type is rational. @hide */
public static final String TAG_GPS_TRACK = "GPSTrack";
/** Type is String. @hide */
public static final String TAG_GPS_TRACK_REF = "GPSTrackRef";
/** Type is String. @hide */
public static final String TAG_GPS_VERSION_ID = "GPSVersionID";
/** Type is String. @hide */
public static final String TAG_INTEROPERABILITY_INDEX = "InteroperabilityIndex";
/** Type is int. @hide */
public static final String TAG_THUMBNAIL_IMAGE_LENGTH = "ThumbnailImageLength";
/** Type is int. @hide */
public static final String TAG_THUMBNAIL_IMAGE_WIDTH = "ThumbnailImageWidth";
// Private tags used for pointing the other IFD offset. The types of the following tags are int.
private static final String TAG_EXIF_IFD_POINTER = "ExifIFDPointer";
private static final String TAG_GPS_INFO_IFD_POINTER = "GPSInfoIFDPointer";
private static final String TAG_INTEROPERABILITY_IFD_POINTER = "InteroperabilityIFDPointer";
// Private tags used for thumbnail information.
private static final String TAG_HAS_THUMBNAIL = "HasThumbnail";
private static final String TAG_THUMBNAIL_OFFSET = "ThumbnailOffset";
private static final String TAG_THUMBNAIL_LENGTH = "ThumbnailLength";
private static final String TAG_THUMBNAIL_DATA = "ThumbnailData";
// Constants used for the Orientation Exif tag.
public static final int ORIENTATION_UNDEFINED = 0;
public static final int ORIENTATION_NORMAL = 1;
public static final int ORIENTATION_FLIP_HORIZONTAL = 2; // left right reversed mirror
public static final int ORIENTATION_ROTATE_180 = 3;
public static final int ORIENTATION_FLIP_VERTICAL = 4; // upside down mirror
// flipped about top-left <--> bottom-right axis
public static final int ORIENTATION_TRANSPOSE = 5;
public static final int ORIENTATION_ROTATE_90 = 6; // rotate 90 cw to right it
// flipped about top-right <--> bottom-left axis
public static final int ORIENTATION_TRANSVERSE = 7;
public static final int ORIENTATION_ROTATE_270 = 8; // rotate 270 to right it
// Constants used for white balance
public static final int WHITEBALANCE_AUTO = 0;
public static final int WHITEBALANCE_MANUAL = 1;
private static SimpleDateFormat sFormatter;
// See Exchangeable image file format for digital still cameras: Exif version 2.2.
// The following values are for parsing EXIF data area. There are tag groups in EXIF data area.
// They are called "Image File Directory". They have multiple data formats to cover various
// image metadata from GPS longitude to camera model name.
// Types of Exif byte alignments (see JEITA CP-3451 page 10)
private static final short BYTE_ALIGN_II = 0x4949; // II: Intel order
private static final short BYTE_ALIGN_MM = 0x4d4d; // MM: Motorola order
// Formats for the value in IFD entry (See TIFF 6.0 spec Types page 15).
private static final int IFD_FORMAT_BYTE = 1;
private static final int IFD_FORMAT_STRING = 2;
private static final int IFD_FORMAT_USHORT = 3;
private static final int IFD_FORMAT_ULONG = 4;
private static final int IFD_FORMAT_URATIONAL = 5;
private static final int IFD_FORMAT_SBYTE = 6;
private static final int IFD_FORMAT_UNDEFINED = 7;
private static final int IFD_FORMAT_SSHORT = 8;
private static final int IFD_FORMAT_SLONG = 9;
private static final int IFD_FORMAT_SRATIONAL = 10;
private static final int IFD_FORMAT_SINGLE = 11;
private static final int IFD_FORMAT_DOUBLE = 12;
// Names for the data formats for debugging purpose.
private static final String[] IFD_FORMAT_NAMES = new String[] {
"", "BYTE", "STRING", "USHORT", "ULONG", "URATIONAL", "SBYTE", "UNDEFINED", "SSHORT",
"SLONG", "SRATIONAL", "SINGLE", "DOUBLE"
};
// Sizes of the components of each IFD value format
private static final int[] IFD_FORMAT_BYTES_PER_FORMAT = new int[] {
0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8
};
private static final byte[] EXIF_ASCII_PREFIX = new byte[] {
0x41, 0x53, 0x43, 0x49, 0x49, 0x0, 0x0, 0x0
};
// A class for indicating EXIF rational type.
private static class Rational {
public final long numerator;
public final long denominator;
private Rational(long numerator, long denominator) {
// Handle erroneous case
if (denominator == 0) {
this.numerator = 0;
this.denominator = 1;
return;
}
this.numerator = numerator;
this.denominator = denominator;
}
@Override
public String toString() {
return numerator + "/" + denominator;
}
public double calculate() {
return (double) numerator / denominator;
}
}
// A class for indicating EXIF attribute.
private static class ExifAttribute {
public final int format;
public final int numberOfComponents;
public final byte[] bytes;
private ExifAttribute(int format, int numberOfComponents, byte[] bytes) {
this.format = format;
this.numberOfComponents = numberOfComponents;
this.bytes = bytes;
}
public static ExifAttribute createUShort(int[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_USHORT] * values.length]);
buffer.order(byteOrder);
for (int value : values) {
buffer.putShort((short) value);
}
return new ExifAttribute(IFD_FORMAT_USHORT, values.length, buffer.array());
}
public static ExifAttribute createUShort(int value, ByteOrder byteOrder) {
return createUShort(new int[] {value}, byteOrder);
}
public static ExifAttribute createULong(long[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_ULONG] * values.length]);
buffer.order(byteOrder);
for (long value : values) {
buffer.putInt((int) value);
}
return new ExifAttribute(IFD_FORMAT_ULONG, values.length, buffer.array());
}
public static ExifAttribute createULong(long value, ByteOrder byteOrder) {
return createULong(new long[] {value}, byteOrder);
}
public static ExifAttribute createSLong(int[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_SLONG] * values.length]);
buffer.order(byteOrder);
for (int value : values) {
buffer.putInt(value);
}
return new ExifAttribute(IFD_FORMAT_SLONG, values.length, buffer.array());
}
public static ExifAttribute createSLong(int value, ByteOrder byteOrder) {
return createSLong(new int[] {value}, byteOrder);
}
public static ExifAttribute createByte(String value) {
// Exception for GPSAltitudeRef tag
if (value.length() == 1 && value.charAt(0) >= '0' && value.charAt(0) <= '1') {
final byte[] bytes = new byte[] { (byte) (value.charAt(0) - '0') };
return new ExifAttribute(IFD_FORMAT_BYTE, bytes.length, bytes);
}
final byte[] ascii = value.getBytes(ASCII);
return new ExifAttribute(IFD_FORMAT_BYTE, ascii.length, ascii);
}
public static ExifAttribute createString(String value) {
final byte[] ascii = (value + '\0').getBytes(ASCII);
return new ExifAttribute(IFD_FORMAT_STRING, ascii.length, ascii);
}
public static ExifAttribute createURational(Rational[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_URATIONAL] * values.length]);
buffer.order(byteOrder);
for (Rational value : values) {
buffer.putInt((int) value.numerator);
buffer.putInt((int) value.denominator);
}
return new ExifAttribute(IFD_FORMAT_URATIONAL, values.length, buffer.array());
}
public static ExifAttribute createURational(Rational value, ByteOrder byteOrder) {
return createURational(new Rational[] {value}, byteOrder);
}
public static ExifAttribute createSRational(Rational[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_SRATIONAL] * values.length]);
buffer.order(byteOrder);
for (Rational value : values) {
buffer.putInt((int) value.numerator);
buffer.putInt((int) value.denominator);
}
return new ExifAttribute(IFD_FORMAT_SRATIONAL, values.length, buffer.array());
}
public static ExifAttribute createSRational(Rational value, ByteOrder byteOrder) {
return createSRational(new Rational[] {value}, byteOrder);
}
public static ExifAttribute createDouble(double[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_DOUBLE] * values.length]);
buffer.order(byteOrder);
for (double value : values) {
buffer.putDouble(value);
}
return new ExifAttribute(IFD_FORMAT_DOUBLE, values.length, buffer.array());
}
public static ExifAttribute createDouble(double value, ByteOrder byteOrder) {
return createDouble(new double[] {value}, byteOrder);
}
@Override
public String toString() {
return "(" + IFD_FORMAT_NAMES[format] + ", data length:" + bytes.length + ")";
}
private Object getValue(ByteOrder byteOrder) {
try {
ByteOrderAwarenessDataInputStream inputStream =
new ByteOrderAwarenessDataInputStream(bytes);
inputStream.setByteOrder(byteOrder);
switch (format) {
case IFD_FORMAT_BYTE:
case IFD_FORMAT_SBYTE: {
// Exception for GPSAltitudeRef tag
if (bytes.length == 1 && bytes[0] >= 0 && bytes[0] <= 1) {
return new String(new char[] { (char) (bytes[0] + '0') });
}
return new String(bytes, ASCII);
}
case IFD_FORMAT_UNDEFINED:
case IFD_FORMAT_STRING: {
int index = 0;
if (numberOfComponents >= EXIF_ASCII_PREFIX.length) {
boolean same = true;
for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) {
if (bytes[i] != EXIF_ASCII_PREFIX[i]) {
same = false;
break;
}
}
if (same) {
index = EXIF_ASCII_PREFIX.length;
}
}
StringBuilder stringBuilder = new StringBuilder();
while (index < numberOfComponents) {
int ch = bytes[index];
if (ch == 0) {
break;
}
if (ch >= 32) {
stringBuilder.append((char) ch);
} else {
stringBuilder.append('?');
}
++index;
}
return stringBuilder.toString();
}
case IFD_FORMAT_USHORT: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readUnsignedShort();
}
return values;
}
case IFD_FORMAT_ULONG: {
final long[] values = new long[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readUnsignedInt();
}
return values;
}
case IFD_FORMAT_URATIONAL: {
final Rational[] values = new Rational[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
final long numerator = inputStream.readUnsignedInt();
final long denominator = inputStream.readUnsignedInt();
values[i] = new Rational(numerator, denominator);
}
return values;
}
case IFD_FORMAT_SSHORT: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readShort();
}
return values;
}
case IFD_FORMAT_SLONG: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readInt();
}
return values;
}
case IFD_FORMAT_SRATIONAL: {
final Rational[] values = new Rational[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
final long numerator = inputStream.readInt();
final long denominator = inputStream.readInt();
values[i] = new Rational(numerator, denominator);
}
return values;
}
case IFD_FORMAT_SINGLE: {
final double[] values = new double[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readFloat();
}
return values;
}
case IFD_FORMAT_DOUBLE: {
final double[] values = new double[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readDouble();
}
return values;
}
default:
return null;
}
} catch (IOException e) {
Log.w(TAG, "IOException occurred during reading a value", e);
return null;
}
}
public double getDoubleValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
throw new NumberFormatException("NULL can't be converted to a double value");
}
if (value instanceof String) {
return Double.parseDouble((String) value);
}
if (value instanceof long[]) {
long[] array = (long[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof int[]) {
int[] array = (int[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof double[]) {
double[] array = (double[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof Rational[]) {
Rational[] array = (Rational[]) value;
if (array.length == 1) {
return array[0].calculate();
}
throw new NumberFormatException("There are more than one component");
}
throw new NumberFormatException("Couldn't find a double value");
}
public int getIntValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
throw new NumberFormatException("NULL can't be converted to a integer value");
}
if (value instanceof String) {
return Integer.parseInt((String) value);
}
if (value instanceof long[]) {
long[] array = (long[]) value;
if (array.length == 1) {
return (int) array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof int[]) {
int[] array = (int[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
throw new NumberFormatException("Couldn't find a integer value");
}
public String getStringValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
return null;
}
if (value instanceof String) {
return (String) value;
}
final StringBuilder stringBuilder = new StringBuilder();
if (value instanceof long[]) {
long[] array = (long[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof int[]) {
int[] array = (int[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof double[]) {
double[] array = (double[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof Rational[]) {
Rational[] array = (Rational[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i].numerator);
stringBuilder.append('/');
stringBuilder.append(array[i].denominator);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
return null;
}
public int size() {
return IFD_FORMAT_BYTES_PER_FORMAT[format] * numberOfComponents;
}
}
// A class for indicating EXIF tag.
private static class ExifTag {
public final int number;
public final String name;
public final int primaryFormat;
public final int secondaryFormat;
private ExifTag(String name, int number, int format) {
this.name = name;
this.number = number;
this.primaryFormat = format;
this.secondaryFormat = -1;
}
private ExifTag(String name, int number, int primaryFormat, int secondaryFormat) {
this.name = name;
this.number = number;
this.primaryFormat = primaryFormat;
this.secondaryFormat = secondaryFormat;
}
}
// Primary image IFD TIFF tags (See JEITA CP-3451 Table 14. page 54).
private static final ExifTag[] IFD_TIFF_TAGS = new ExifTag[] {
new ExifTag(TAG_IMAGE_WIDTH, 256, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_IMAGE_LENGTH, 257, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_BITS_PER_SAMPLE, 258, IFD_FORMAT_USHORT),
new ExifTag(TAG_COMPRESSION, 259, IFD_FORMAT_USHORT),
new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_DESCRIPTION, 270, IFD_FORMAT_STRING),
new ExifTag(TAG_MAKE, 271, IFD_FORMAT_STRING),
new ExifTag(TAG_MODEL, 272, IFD_FORMAT_STRING),
new ExifTag(TAG_STRIP_OFFSETS, 273, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORIENTATION, 274, IFD_FORMAT_USHORT),
new ExifTag(TAG_SAMPLES_PER_PIXEL, 277, IFD_FORMAT_USHORT),
new ExifTag(TAG_ROWS_PER_STRIP, 278, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_STRIP_BYTE_COUNTS, 279, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_X_RESOLUTION, 282, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_RESOLUTION, 283, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PLANAR_CONFIGURATION, 284, IFD_FORMAT_USHORT),
new ExifTag(TAG_RESOLUTION_UNIT, 296, IFD_FORMAT_USHORT),
new ExifTag(TAG_TRANSFER_FUNCTION, 301, IFD_FORMAT_USHORT),
new ExifTag(TAG_SOFTWARE, 305, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME, 306, IFD_FORMAT_STRING),
new ExifTag(TAG_ARTIST, 315, IFD_FORMAT_STRING),
new ExifTag(TAG_WHITE_POINT, 318, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG),
new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530, IFD_FORMAT_USHORT),
new ExifTag(TAG_Y_CB_CR_POSITIONING, 531, IFD_FORMAT_USHORT),
new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_COPYRIGHT, 33432, IFD_FORMAT_STRING),
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
};
// Primary image IFD Exif Private tags (See JEITA CP-3451 Table 15. page 55).
private static final ExifTag[] IFD_EXIF_TAGS = new ExifTag[] {
new ExifTag(TAG_EXPOSURE_TIME, 33434, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_APERTURE, 33437, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_EXPOSURE_PROGRAM, 34850, IFD_FORMAT_USHORT),
new ExifTag(TAG_SPECTRAL_SENSITIVITY, 34852, IFD_FORMAT_STRING),
new ExifTag(TAG_ISO, 34855, IFD_FORMAT_USHORT),
new ExifTag(TAG_OECF, 34856, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_EXIF_VERSION, 36864, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME_ORIGINAL, 36867, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME_DIGITIZED, 36868, IFD_FORMAT_STRING),
new ExifTag(TAG_COMPONENTS_CONFIGURATION, 37121, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_COMPRESSED_BITS_PER_PIXEL, 37122, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SHUTTER_SPEED_VALUE, 37377, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_APERTURE_VALUE, 37378, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_BRIGHTNESS_VALUE, 37379, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_EXPOSURE_BIAS_VALUE, 37380, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_MAX_APERTURE_VALUE, 37381, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SUBJECT_DISTANCE, 37382, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_METERING_MODE, 37383, IFD_FORMAT_USHORT),
new ExifTag(TAG_LIGHT_SOURCE, 37384, IFD_FORMAT_USHORT),
new ExifTag(TAG_FLASH, 37385, IFD_FORMAT_USHORT),
new ExifTag(TAG_FOCAL_LENGTH, 37386, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SUBJECT_AREA, 37396, IFD_FORMAT_USHORT),
new ExifTag(TAG_MAKER_NOTE, 37500, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_USER_COMMENT, 37510, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SUBSEC_TIME, 37520, IFD_FORMAT_STRING),
new ExifTag(TAG_SUBSEC_TIME_ORIG, 37521, IFD_FORMAT_STRING),
new ExifTag(TAG_SUBSEC_TIME_DIG, 37522, IFD_FORMAT_STRING),
new ExifTag(TAG_FLASHPIX_VERSION, 40960, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_COLOR_SPACE, 40961, IFD_FORMAT_USHORT),
new ExifTag(TAG_PIXEL_X_DIMENSION, 40962, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_PIXEL_Y_DIMENSION, 40963, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_RELATED_SOUND_FILE, 40964, IFD_FORMAT_STRING),
new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965, IFD_FORMAT_ULONG),
new ExifTag(TAG_FLASH_ENERGY, 41483, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SPATIAL_FREQUENCY_RESPONSE, 41484, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_FOCAL_PLANE_X_RESOLUTION, 41486, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_PLANE_Y_RESOLUTION, 41487, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_PLANE_RESOLUTION_UNIT, 41488, IFD_FORMAT_USHORT),
new ExifTag(TAG_SUBJECT_LOCATION, 41492, IFD_FORMAT_USHORT),
new ExifTag(TAG_EXPOSURE_INDEX, 41493, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SENSING_METHOD, 41495, IFD_FORMAT_USHORT),
new ExifTag(TAG_FILE_SOURCE, 41728, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SCENE_TYPE, 41729, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_CFA_PATTERN, 41730, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_CUSTOM_RENDERED, 41985, IFD_FORMAT_USHORT),
new ExifTag(TAG_EXPOSURE_MODE, 41986, IFD_FORMAT_USHORT),
new ExifTag(TAG_WHITE_BALANCE, 41987, IFD_FORMAT_USHORT),
new ExifTag(TAG_DIGITAL_ZOOM_RATIO, 41988, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_LENGTH_IN_35MM_FILM, 41989, IFD_FORMAT_USHORT),
new ExifTag(TAG_SCENE_CAPTURE_TYPE, 41990, IFD_FORMAT_USHORT),
new ExifTag(TAG_GAIN_CONTROL, 41991, IFD_FORMAT_USHORT),
new ExifTag(TAG_CONTRAST, 41992, IFD_FORMAT_USHORT),
new ExifTag(TAG_SATURATION, 41993, IFD_FORMAT_USHORT),
new ExifTag(TAG_SHARPNESS, 41994, IFD_FORMAT_USHORT),
new ExifTag(TAG_DEVICE_SETTING_DESCRIPTION, 41995, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SUBJECT_DISTANCE_RANGE, 41996, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_UNIQUE_ID, 42016, IFD_FORMAT_STRING),
};
// Primary image IFD GPS Info tags (See JEITA CP-3451 Table 16. page 56).
private static final ExifTag[] IFD_GPS_TAGS = new ExifTag[] {
new ExifTag(TAG_GPS_VERSION_ID, 0, IFD_FORMAT_BYTE),
new ExifTag(TAG_GPS_LATITUDE_REF, 1, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_LATITUDE, 2, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_LONGITUDE_REF, 3, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_LONGITUDE, 4, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_ALTITUDE_REF, 5, IFD_FORMAT_BYTE),
new ExifTag(TAG_GPS_ALTITUDE, 6, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_TIMESTAMP, 7, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_SATELLITES, 8, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_STATUS, 9, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_MEASURE_MODE, 10, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DOP, 11, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_SPEED_REF, 12, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_SPEED, 13, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_TRACK_REF, 14, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_TRACK, 15, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_IMG_DIRECTION_REF, 16, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_IMG_DIRECTION, 17, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_MAP_DATUM, 18, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LATITUDE_REF, 19, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LATITUDE, 20, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_LONGITUDE_REF, 21, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LONGITUDE, 22, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_BEARING_REF, 23, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_BEARING, 24, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_DISTANCE_REF, 25, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_DISTANCE, 26, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_PROCESSING_METHOD, 27, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_GPS_AREA_INFORMATION, 28, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_GPS_DATESTAMP, 29, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DIFFERENTIAL, 30, IFD_FORMAT_USHORT),
};
// Primary image IFD Interoperability tag (See JEITA CP-3451 Table 17. page 56).
private static final ExifTag[] IFD_INTEROPERABILITY_TAGS = new ExifTag[] {
new ExifTag(TAG_INTEROPERABILITY_INDEX, 1, IFD_FORMAT_STRING),
};
// IFD Thumbnail tags (See JEITA CP-3451 Table 18. page 57).
private static final ExifTag[] IFD_THUMBNAIL_TAGS = new ExifTag[] {
new ExifTag(TAG_THUMBNAIL_IMAGE_WIDTH, 256, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_THUMBNAIL_IMAGE_LENGTH, 257, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_BITS_PER_SAMPLE, 258, IFD_FORMAT_USHORT),
new ExifTag(TAG_COMPRESSION, 259, IFD_FORMAT_USHORT),
new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_DESCRIPTION, 270, IFD_FORMAT_STRING),
new ExifTag(TAG_MAKE, 271, IFD_FORMAT_STRING),
new ExifTag(TAG_MODEL, 272, IFD_FORMAT_STRING),
new ExifTag(TAG_STRIP_OFFSETS, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORIENTATION, 274, IFD_FORMAT_USHORT),
new ExifTag(TAG_SAMPLES_PER_PIXEL, 277, IFD_FORMAT_USHORT),
new ExifTag(TAG_ROWS_PER_STRIP, 278, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_STRIP_BYTE_COUNTS, 279, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_X_RESOLUTION, 282, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_RESOLUTION, 283, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PLANAR_CONFIGURATION, 284, IFD_FORMAT_USHORT),
new ExifTag(TAG_RESOLUTION_UNIT, 296, IFD_FORMAT_USHORT),
new ExifTag(TAG_TRANSFER_FUNCTION, 301, IFD_FORMAT_USHORT),
new ExifTag(TAG_SOFTWARE, 305, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME, 306, IFD_FORMAT_STRING),
new ExifTag(TAG_ARTIST, 315, IFD_FORMAT_STRING),
new ExifTag(TAG_WHITE_POINT, 318, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG),
new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530, IFD_FORMAT_USHORT),
new ExifTag(TAG_Y_CB_CR_POSITIONING, 531, IFD_FORMAT_USHORT),
new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_COPYRIGHT, 33432, IFD_FORMAT_STRING),
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
};
// See JEITA CP-3451 Figure 5. page 9.
// The following values are used for indicating pointers to the other Image File Directorys.
// Indices of Exif Ifd tag groups
private static final int IFD_TIFF_HINT = 0;
private static final int IFD_EXIF_HINT = 1;
private static final int IFD_GPS_HINT = 2;
private static final int IFD_INTEROPERABILITY_HINT = 3;
private static final int IFD_THUMBNAIL_HINT = 4;
// List of Exif tag groups
private static final ExifTag[][] EXIF_TAGS = new ExifTag[][] {
IFD_TIFF_TAGS, IFD_EXIF_TAGS, IFD_GPS_TAGS, IFD_INTEROPERABILITY_TAGS,
IFD_THUMBNAIL_TAGS
};
// List of tags for pointing to the other image file directory offset.
private static final ExifTag[] IFD_POINTER_TAGS = new ExifTag[] {
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965, IFD_FORMAT_ULONG),
};
// List of indices of the indicated tag groups according to the IFD_POINTER_TAGS
private static final int[] IFD_POINTER_TAG_HINTS = new int[] {
IFD_EXIF_HINT, IFD_GPS_HINT, IFD_INTEROPERABILITY_HINT
};
// Tags for indicating the thumbnail offset and length
private static final ExifTag JPEG_INTERCHANGE_FORMAT_TAG =
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG);
private static final ExifTag JPEG_INTERCHANGE_FORMAT_LENGTH_TAG =
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG);
// Mappings from tag number to tag name and each item represents one IFD tag group.
private static final HashMap[] sExifTagMapsForReading = new HashMap[EXIF_TAGS.length];
// Mappings from tag name to tag number and each item represents one IFD tag group.
private static final HashMap[] sExifTagMapsForWriting = new HashMap[EXIF_TAGS.length];
private static final HashSet<String> sTagSetForCompatibility = new HashSet<>(Arrays.asList(
TAG_APERTURE, TAG_DIGITAL_ZOOM_RATIO, TAG_EXPOSURE_TIME, TAG_SUBJECT_DISTANCE,
TAG_GPS_TIMESTAMP));
// See JPEG File Interchange Format Version 1.02.
// The following values are defined for handling JPEG streams. In this implementation, we are
// not only getting information from EXIF but also from some JPEG special segments such as
// MARKER_COM for user comment and MARKER_SOFx for image width and height.
private static final Charset ASCII = Charset.forName("US-ASCII");
// Identifier for EXIF APP1 segment in JPEG
private static final byte[] IDENTIFIER_EXIF_APP1 = "Exif\0\0".getBytes(ASCII);
// JPEG segment markers, that each marker consumes two bytes beginning with 0xff and ending with
// the indicator. There is no SOF4, SOF8, SOF16 markers in JPEG and SOFx markers indicates start
// of frame(baseline DCT) and the image size info exists in its beginning part.
private static final byte MARKER = (byte) 0xff;
private static final byte MARKER_SOI = (byte) 0xd8;
private static final byte MARKER_SOF0 = (byte) 0xc0;
private static final byte MARKER_SOF1 = (byte) 0xc1;
private static final byte MARKER_SOF2 = (byte) 0xc2;
private static final byte MARKER_SOF3 = (byte) 0xc3;
private static final byte MARKER_SOF5 = (byte) 0xc5;
private static final byte MARKER_SOF6 = (byte) 0xc6;
private static final byte MARKER_SOF7 = (byte) 0xc7;
private static final byte MARKER_SOF9 = (byte) 0xc9;
private static final byte MARKER_SOF10 = (byte) 0xca;
private static final byte MARKER_SOF11 = (byte) 0xcb;
private static final byte MARKER_SOF13 = (byte) 0xcd;
private static final byte MARKER_SOF14 = (byte) 0xce;
private static final byte MARKER_SOF15 = (byte) 0xcf;
private static final byte MARKER_SOS = (byte) 0xda;
private static final byte MARKER_APP1 = (byte) 0xe1;
private static final byte MARKER_COM = (byte) 0xfe;
private static final byte MARKER_EOI = (byte) 0xd9;
static {
sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
sFormatter.setTimeZone(TimeZone.getTimeZone("UTC"));
// Build up the hash tables to look up Exif tags for reading Exif tags.
for (int hint = 0; hint < EXIF_TAGS.length; ++hint) {
sExifTagMapsForReading[hint] = new HashMap();
sExifTagMapsForWriting[hint] = new HashMap();
for (ExifTag tag : EXIF_TAGS[hint]) {
sExifTagMapsForReading[hint].put(tag.number, tag);
sExifTagMapsForWriting[hint].put(tag.name, tag);
}
}
}
private final String mFilename;
private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length];
private ByteOrder mExifByteOrder = ByteOrder.BIG_ENDIAN;
private boolean mHasThumbnail;
// The following values used for indicating a thumbnail position.
private int mThumbnailOffset;
private int mThumbnailLength;
private byte[] mThumbnailBytes;
// Pattern to check non zero timestamp
private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*");
// Pattern to check gps timestamp
private static final Pattern sGpsTimestampPattern =
Pattern.compile("^([0-9][0-9]):([0-9][0-9]):([0-9][0-9])$");
/**
* Reads Exif tags from the specified image file.
*/
public ExifInterface(String filename) throws IOException {
if (filename == null) {
throw new IllegalArgumentException("filename cannot be null");
}
mFilename = filename;
loadAttributes();
}
/**
* Returns the EXIF attribute of the specified tag or {@code null} if there is no such tag in
* the image file.
*
* @param tag the name of the tag.
*/
private ExifAttribute getExifAttribute(String tag) {
// Retrieves all tag groups. The value from primary image tag group has a higher priority
// than the value from the thumbnail tag group if there are more than one candidates.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
Object value = mAttributes[i].get(tag);
if (value != null) {
return (ExifAttribute) value;
}
}
return null;
}
/**
* Returns the value of the specified tag or {@code null} if there
* is no such tag in the image file.
*
* @param tag the name of the tag.
*/
public String getAttribute(String tag) {
ExifAttribute attribute = getExifAttribute(tag);
if (attribute != null) {
if (!sTagSetForCompatibility.contains(tag)) {
return attribute.getStringValue(mExifByteOrder);
}
if (tag.equals(TAG_GPS_TIMESTAMP)) {
// Convert the rational values to the custom formats for backwards compatibility.
if (attribute.format != IFD_FORMAT_URATIONAL
&& attribute.format != IFD_FORMAT_SRATIONAL) {
return null;
}
Rational[] array = (Rational[]) attribute.getValue(mExifByteOrder);
if (array.length != 3) {
return null;
}
return String.format("%02d:%02d:%02d",
(int) ((float) array[0].numerator / array[0].denominator),
(int) ((float) array[1].numerator / array[1].denominator),
(int) ((float) array[2].numerator / array[2].denominator));
}
try {
return Double.toString(attribute.getDoubleValue(mExifByteOrder));
} catch (NumberFormatException e) {
return null;
}
}
return null;
}
/**
* Returns the integer value of the specified tag. If there is no such tag
* in the image file or the value cannot be parsed as integer, return
* <var>defaultValue</var>.
*
* @param tag the name of the tag.
* @param defaultValue the value to return if the tag is not available.
*/
public int getAttributeInt(String tag, int defaultValue) {
ExifAttribute exifAttribute = getExifAttribute(tag);
if (exifAttribute == null) {
return defaultValue;
}
try {
return exifAttribute.getIntValue(mExifByteOrder);
} catch (NumberFormatException e) {
return defaultValue;
}
}
/**
* Returns the double value of the tag that is specified as rational or contains a
* double-formatted value. If there is no such tag in the image file or the value cannot be
* parsed as double, return <var>defaultValue</var>.
*
* @param tag the name of the tag.
* @param defaultValue the value to return if the tag is not available.
*/
public double getAttributeDouble(String tag, double defaultValue) {
ExifAttribute exifAttribute = getExifAttribute(tag);
if (exifAttribute == null) {
return defaultValue;
}
try {
return exifAttribute.getDoubleValue(mExifByteOrder);
} catch (NumberFormatException e) {
return defaultValue;
}
}
/**
* Set the value of the specified tag.
*
* @param tag the name of the tag.
* @param value the value of the tag.
*/
public void setAttribute(String tag, String value) {
// Convert the given value to rational values for backwards compatibility.
if (value != null && sTagSetForCompatibility.contains(tag)) {
if (tag.equals(TAG_GPS_TIMESTAMP)) {
Matcher m = sGpsTimestampPattern.matcher(value);
if (!m.find()) {
Log.w(TAG, "Invalid value for " + tag + " : " + value);
return;
}
value = Integer.parseInt(m.group(1)) + "/1," + Integer.parseInt(m.group(2)) + "/1,"
+ Integer.parseInt(m.group(3)) + "/1";
} else {
try {
double doubleValue = Double.parseDouble(value);
value = (long) (doubleValue * 10000L) + "/10000";
} catch (NumberFormatException e) {
Log.w(TAG, "Invalid value for " + tag + " : " + value);
return;
}
}
}
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
if (i == IFD_THUMBNAIL_HINT && !mHasThumbnail) {
continue;
}
final Object obj = sExifTagMapsForWriting[i].get(tag);
if (obj != null) {
if (value == null) {
mAttributes[i].remove(tag);
continue;
}
final ExifTag exifTag = (ExifTag) obj;
Pair<Integer, Integer> guess = guessDataFormat(value);
int dataFormat;
if (exifTag.primaryFormat == guess.first || exifTag.primaryFormat == guess.second) {
dataFormat = exifTag.primaryFormat;
} else if (exifTag.secondaryFormat != -1 && (exifTag.secondaryFormat == guess.first
|| exifTag.secondaryFormat == guess.second)) {
dataFormat = exifTag.secondaryFormat;
} else if (exifTag.primaryFormat == IFD_FORMAT_BYTE
|| exifTag.primaryFormat == IFD_FORMAT_UNDEFINED
|| exifTag.primaryFormat == IFD_FORMAT_STRING) {
dataFormat = exifTag.primaryFormat;
} else {
Log.w(TAG, "Given tag (" + tag + ") value didn't match with one of expected "
+ "formats: " + IFD_FORMAT_NAMES[exifTag.primaryFormat]
+ (exifTag.secondaryFormat == -1 ? "" : ", "
+ IFD_FORMAT_NAMES[exifTag.secondaryFormat]) + " (guess: "
+ IFD_FORMAT_NAMES[guess.first] + (guess.second == -1 ? "" : ", "
+ IFD_FORMAT_NAMES[guess.second]) + ")");
continue;
}
switch (dataFormat) {
case IFD_FORMAT_BYTE: {
mAttributes[i].put(tag, ExifAttribute.createByte(value));
break;
}
case IFD_FORMAT_UNDEFINED:
case IFD_FORMAT_STRING: {
mAttributes[i].put(tag, ExifAttribute.createString(value));
break;
}
case IFD_FORMAT_USHORT: {
final String[] values = value.split(",");
final int[] intArray = new int[values.length];
for (int j = 0; j < values.length; ++j) {
intArray[j] = Integer.parseInt(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createUShort(intArray, mExifByteOrder));
break;
}
case IFD_FORMAT_SLONG: {
final String[] values = value.split(",");
final int[] intArray = new int[values.length];
for (int j = 0; j < values.length; ++j) {
intArray[j] = Integer.parseInt(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createSLong(intArray, mExifByteOrder));
break;
}
case IFD_FORMAT_ULONG: {
final String[] values = value.split(",");
final long[] longArray = new long[values.length];
for (int j = 0; j < values.length; ++j) {
longArray[j] = Long.parseLong(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createULong(longArray, mExifByteOrder));
break;
}
case IFD_FORMAT_URATIONAL: {
final String[] values = value.split(",");
final Rational[] rationalArray = new Rational[values.length];
for (int j = 0; j < values.length; ++j) {
final String[] numbers = values[j].split("/");
rationalArray[j] = new Rational(Long.parseLong(numbers[0]),
Long.parseLong(numbers[1]));
}
mAttributes[i].put(tag,
ExifAttribute.createURational(rationalArray, mExifByteOrder));
break;
}
case IFD_FORMAT_SRATIONAL: {
final String[] values = value.split(",");
final Rational[] rationalArray = new Rational[values.length];
for (int j = 0; j < values.length; ++j) {
final String[] numbers = values[j].split("/");
rationalArray[j] = new Rational(Long.parseLong(numbers[0]),
Long.parseLong(numbers[1]));
}
mAttributes[i].put(tag,
ExifAttribute.createSRational(rationalArray, mExifByteOrder));
break;
}
case IFD_FORMAT_DOUBLE: {
final String[] values = value.split(",");
final double[] doubleArray = new double[values.length];
for (int j = 0; j < values.length; ++j) {
doubleArray[j] = Double.parseDouble(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createDouble(doubleArray, mExifByteOrder));
break;
}
default:
Log.w(TAG, "Data format isn't one of expected formats: " + dataFormat);
continue;
}
}
}
}
/**
* Update the values of the tags in the tag groups if any value for the tag already was stored.
*
* @param tag the name of the tag.
* @param value the value of the tag in a form of {@link ExifAttribute}.
* @return Returns {@code true} if updating is placed.
*/
private boolean updateAttribute(String tag, ExifAttribute value) {
boolean updated = false;
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
if (mAttributes[i].containsKey(tag)) {
mAttributes[i].put(tag, value);
updated = true;
}
}
return updated;
}
/**
* Remove any values of the specified tag.
*
* @param tag the name of the tag.
*/
private void removeAttribute(String tag) {
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
mAttributes[i].remove(tag);
}
}
/**
* This function decides which parser to read the image data according to the given input stream
* type and the content of the input stream. In each case, it reads the first three bytes to
* determine whether the image data format is JPEG or not.
*/
private void loadAttributes() throws IOException {
try {
InputStream in = new FileInputStream(mFilename);
// Initialize mAttributes.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
mAttributes[i] = new HashMap();
}
getJpegAttributes(in);
} catch (IOException e) {
// Ignore exceptions in order to keep the compatibility with the old versions of
// ExifInterface.
Log.w(TAG, "Invalid image.", e);
} finally {
addDefaultValuesForCompatibility();
if (DEBUG) {
printAttributes();
}
}
}
// Prints out attributes for debugging.
private void printAttributes() {
for (int i = 0; i < mAttributes.length; ++i) {
Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size());
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) {
final ExifAttribute tagValue = (ExifAttribute) entry.getValue();
Log.d(TAG, "tagName: " + entry.getKey() + ", tagType: " + tagValue.toString()
+ ", tagValue: '" + tagValue.getStringValue(mExifByteOrder) + "'");
}
}
}
/**
* Save the tag data into the original image file. This is expensive because it involves
* copying all the data from one file to another and deleting the old file and renaming the
* other. It's best to use {@link #setAttribute(String,String)} to set all attributes to write
* and make a single call rather than multiple calls for each attribute.
*/
public void saveAttributes() throws IOException {
// Keep the thumbnail in memory
mThumbnailBytes = getThumbnail();
File tempFile = null;
// Move the original file to temporary file.
tempFile = new File(mFilename + ".tmp");
File originalFile = new File(mFilename);
if (!originalFile.renameTo(tempFile)) {
throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath());
}
FileInputStream in = null;
FileOutputStream out = null;
try {
// Save the new file.
in = new FileInputStream(tempFile);
out = new FileOutputStream(mFilename);
saveJpegAttributes(in, out);
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
tempFile.delete();
}
// Discard the thumbnail in memory
mThumbnailBytes = null;
}
/**
* Returns true if the image file has a thumbnail.
*/
public boolean hasThumbnail() {
return mHasThumbnail;
}
/**
* Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail.
* The returned data is in JPEG format and can be decoded using
* {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)}
*/
public byte[] getThumbnail() {
if (!mHasThumbnail) {
return null;
}
if (mThumbnailBytes != null) {
return mThumbnailBytes;
}
// Read the thumbnail.
FileInputStream in = null;
try {
in = new FileInputStream(mFilename);
if (in.skip(mThumbnailOffset) != mThumbnailOffset) {
throw new IOException("Corrupted image");
}
byte[] buffer = new byte[mThumbnailLength];
if (in.read(buffer) != mThumbnailLength) {
throw new IOException("Corrupted image");
}
return buffer;
} catch (IOException e) {
// Couldn't get a thumbnail image.
} finally {
IoUtils.closeQuietly(in);
}
return null;
}
/**
* Returns the offset and length of thumbnail inside the image file, or
* {@code null} if there is no thumbnail.
*
* @return two-element array, the offset in the first value, and length in
* the second, or {@code null} if no thumbnail was found.
* @hide
*/
public long[] getThumbnailRange() {
if (!mHasThumbnail) {
return null;
}
long[] range = new long[2];
range[0] = mThumbnailOffset;
range[1] = mThumbnailLength;
return range;
}
/**
* Stores the latitude and longitude value in a float array. The first element is
* the latitude, and the second element is the longitude. Returns false if the
* Exif tags are not available.
*/
public boolean getLatLong(float output[]) {
String latValue = getAttribute(TAG_GPS_LATITUDE);
String latRef = getAttribute(TAG_GPS_LATITUDE_REF);
String lngValue = getAttribute(TAG_GPS_LONGITUDE);
String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF);
if (latValue != null && latRef != null && lngValue != null && lngRef != null) {
try {
output[0] = convertRationalLatLonToFloat(latValue, latRef);
output[1] = convertRationalLatLonToFloat(lngValue, lngRef);
return true;
} catch (IllegalArgumentException e) {
// if values are not parseable
}
}
return false;
}
/**
* Return the altitude in meters. If the exif tag does not exist, return
* <var>defaultValue</var>.
*
* @param defaultValue the value to return if the tag is not available.
*/
public double getAltitude(double defaultValue) {
double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1);
int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1);
if (altitude >= 0 && ref >= 0) {
return (altitude * ((ref == 1) ? -1 : 1));
} else {
return defaultValue;
}
}
/**
* Returns number of milliseconds since Jan. 1, 1970, midnight local time.
* Returns -1 if the date time information if not available.
* @hide
*/
public long getDateTime() {
String dateTimeString = getAttribute(TAG_DATETIME);
if (dateTimeString == null
|| !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1;
ParsePosition pos = new ParsePosition(0);
try {
// The exif field is in local time. Parsing it as if it is UTC will yield time
// since 1/1/1970 local time
Date datetime = sFormatter.parse(dateTimeString, pos);
if (datetime == null) return -1;
long msecs = datetime.getTime();
String subSecs = getAttribute(TAG_SUBSEC_TIME);
if (subSecs != null) {
try {
long sub = Long.valueOf(subSecs);
while (sub > 1000) {
sub /= 10;
}
msecs += sub;
} catch (NumberFormatException e) {
// Ignored
}
}
return msecs;
} catch (IllegalArgumentException e) {
return -1;
}
}
/**
* Returns number of milliseconds since Jan. 1, 1970, midnight UTC.
* Returns -1 if the date time information if not available.
* @hide
*/
public long getGpsDateTime() {
String date = getAttribute(TAG_GPS_DATESTAMP);
String time = getAttribute(TAG_GPS_TIMESTAMP);
if (date == null || time == null
|| (!sNonZeroTimePattern.matcher(date).matches()
&& !sNonZeroTimePattern.matcher(time).matches())) {
return -1;
}
String dateTimeString = date + ' ' + time;
ParsePosition pos = new ParsePosition(0);
try {
Date datetime = sFormatter.parse(dateTimeString, pos);
if (datetime == null) return -1;
return datetime.getTime();
} catch (IllegalArgumentException e) {
return -1;
}
}
private static float convertRationalLatLonToFloat(String rationalString, String ref) {
try {
String [] parts = rationalString.split(",");
String [] pair;
pair = parts[0].split("/");
double degrees = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
pair = parts[1].split("/");
double minutes = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
pair = parts[2].split("/");
double seconds = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
double result = degrees + (minutes / 60.0) + (seconds / 3600.0);
if ((ref.equals("S") || ref.equals("W"))) {
return (float) -result;
}
return (float) result;
} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
// Not valid
throw new IllegalArgumentException();
}
}
// Loads EXIF attributes from a JPEG input stream.
private void getJpegAttributes(InputStream inputStream) throws IOException {
// See JPEG File Interchange Format Specification page 5.
if (DEBUG) {
Log.d(TAG, "getJpegAttributes starting with: " + inputStream);
}
DataInputStream dataInputStream = new DataInputStream(inputStream);
byte marker;
int bytesRead = 0;
if ((marker = dataInputStream.readByte()) != MARKER) {
throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
if (dataInputStream.readByte() != MARKER_SOI) {
throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
while (true) {
marker = dataInputStream.readByte();
if (marker != MARKER) {
throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff));
}
++bytesRead;
marker = dataInputStream.readByte();
if (DEBUG) {
Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
// EOI indicates the end of an image and in case of SOS, JPEG image stream starts and
// the image data will terminate right after.
if (marker == MARKER_EOI || marker == MARKER_SOS) {
break;
}
int length = dataInputStream.readUnsignedShort() - 2;
bytesRead += 2;
if (DEBUG) {
Log.d(TAG, "JPEG segment: " + Integer.toHexString(marker & 0xff) + " (length: "
+ (length + 2) + ")");
}
if (length < 0) {
throw new IOException("Invalid length");
}
switch (marker) {
case MARKER_APP1: {
if (DEBUG) {
Log.d(TAG, "MARKER_APP1");
}
if (length < 6) {
// Skip if it's not an EXIF APP1 segment.
break;
}
byte[] identifier = new byte[6];
if (inputStream.read(identifier) != 6) {
throw new IOException("Invalid exif");
}
bytesRead += 6;
length -= 6;
if (!Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) {
// Skip if it's not an EXIF APP1 segment.
break;
}
if (length <= 0) {
throw new IOException("Invalid exif");
}
if (DEBUG) {
Log.d(TAG, "readExifSegment with a byte array (length: " + length + ")");
}
byte[] bytes = new byte[length];
if (dataInputStream.read(bytes) != length) {
throw new IOException("Invalid exif");
}
readExifSegment(bytes, bytesRead);
bytesRead += length;
length = 0;
break;
}
case MARKER_COM: {
byte[] bytes = new byte[length];
if (dataInputStream.read(bytes) != length) {
throw new IOException("Invalid exif");
}
length = 0;
if (getAttribute(TAG_USER_COMMENT) == null) {
mAttributes[IFD_EXIF_HINT].put(TAG_USER_COMMENT, ExifAttribute.createString(
new String(bytes, ASCII)));
}
break;
}
case MARKER_SOF0:
case MARKER_SOF1:
case MARKER_SOF2:
case MARKER_SOF3:
case MARKER_SOF5:
case MARKER_SOF6:
case MARKER_SOF7:
case MARKER_SOF9:
case MARKER_SOF10:
case MARKER_SOF11:
case MARKER_SOF13:
case MARKER_SOF14:
case MARKER_SOF15: {
if (dataInputStream.skipBytes(1) != 1) {
throw new IOException("Invalid SOFx");
}
mAttributes[IFD_TIFF_HINT].put(TAG_IMAGE_LENGTH, ExifAttribute.createULong(
dataInputStream.readUnsignedShort(), mExifByteOrder));
mAttributes[IFD_TIFF_HINT].put(TAG_IMAGE_WIDTH, ExifAttribute.createULong(
dataInputStream.readUnsignedShort(), mExifByteOrder));
length -= 5;
break;
}
default: {
break;
}
}
if (length < 0) {
throw new IOException("Invalid length");
}
if (dataInputStream.skipBytes(length) != length) {
throw new IOException("Invalid JPEG segment");
}
bytesRead += length;
}
}
// Stores a new JPEG image with EXIF attributes into a given output stream.
private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream)
throws IOException {
// See JPEG File Interchange Format Specification page 5.
if (DEBUG) {
Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream
+ ", outputStream: " + outputStream + ")");
}
DataInputStream dataInputStream = new DataInputStream(inputStream);
ByteOrderAwarenessDataOutputStream dataOutputStream =
new ByteOrderAwarenessDataOutputStream(outputStream, ByteOrder.BIG_ENDIAN);
if (dataInputStream.readByte() != MARKER) {
throw new IOException("Invalid marker");
}
dataOutputStream.writeByte(MARKER);
if (dataInputStream.readByte() != MARKER_SOI) {
throw new IOException("Invalid marker");
}
dataOutputStream.writeByte(MARKER_SOI);
// Write EXIF APP1 segment
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(MARKER_APP1);
writeExifSegment(dataOutputStream, 6);
byte[] bytes = new byte[4096];
while (true) {
byte marker = dataInputStream.readByte();
if (marker != MARKER) {
throw new IOException("Invalid marker");
}
marker = dataInputStream.readByte();
switch (marker) {
case MARKER_APP1: {
int length = dataInputStream.readUnsignedShort() - 2;
if (length < 0) {
throw new IOException("Invalid length");
}
byte[] identifier = new byte[6];
if (length >= 6) {
if (dataInputStream.read(identifier) != 6) {
throw new IOException("Invalid exif");
}
if (Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) {
// Skip the original EXIF APP1 segment.
if (dataInputStream.skip(length - 6) != length - 6) {
throw new IOException("Invalid length");
}
break;
}
}
// Copy non-EXIF APP1 segment.
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
dataOutputStream.writeUnsignedShort(length + 2);
if (length >= 6) {
length -= 6;
dataOutputStream.write(identifier);
}
int read;
while (length > 0 && (read = dataInputStream.read(
bytes, 0, Math.min(length, bytes.length))) >= 0) {
dataOutputStream.write(bytes, 0, read);
length -= read;
}
break;
}
case MARKER_EOI:
case MARKER_SOS: {
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
// Copy all the remaining data
Streams.copy(dataInputStream, dataOutputStream);
return;
}
default: {
// Copy JPEG segment
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
int length = dataInputStream.readUnsignedShort();
dataOutputStream.writeUnsignedShort(length);
length -= 2;
if (length < 0) {
throw new IOException("Invalid length");
}
int read;
while (length > 0 && (read = dataInputStream.read(
bytes, 0, Math.min(length, bytes.length))) >= 0) {
dataOutputStream.write(bytes, 0, read);
length -= read;
}
break;
}
}
}
}
// Reads the given EXIF byte area and save its tag data into attributes.
private void readExifSegment(byte[] exifBytes, int exifOffsetFromBeginning) throws IOException {
// Parse TIFF Headers. See JEITA CP-3451C Table 1. page 10.
ByteOrderAwarenessDataInputStream dataInputStream =
new ByteOrderAwarenessDataInputStream(exifBytes);
// Read byte align
short byteOrder = dataInputStream.readShort();
switch (byteOrder) {
case BYTE_ALIGN_II:
if (DEBUG) {
Log.d(TAG, "readExifSegment: Byte Align II");
}
mExifByteOrder = ByteOrder.LITTLE_ENDIAN;
break;
case BYTE_ALIGN_MM:
if (DEBUG) {
Log.d(TAG, "readExifSegment: Byte Align MM");
}
mExifByteOrder = ByteOrder.BIG_ENDIAN;
break;
default:
throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder));
}
// Set byte order.
dataInputStream.setByteOrder(mExifByteOrder);
int startCode = dataInputStream.readUnsignedShort();
if (startCode != 0x2a) {
throw new IOException("Invalid exif start: " + Integer.toHexString(startCode));
}
// Read first ifd offset
long firstIfdOffset = dataInputStream.readUnsignedInt();
if (firstIfdOffset < 8 || firstIfdOffset >= exifBytes.length) {
throw new IOException("Invalid first Ifd offset: " + firstIfdOffset);
}
firstIfdOffset -= 8;
if (firstIfdOffset > 0) {
if (dataInputStream.skip(firstIfdOffset) != firstIfdOffset) {
throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset);
}
}
// Read primary image TIFF image file directory.
readImageFileDirectory(dataInputStream, IFD_TIFF_HINT);
// Process thumbnail.
String jpegInterchangeFormatString = getAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name);
String jpegInterchangeFormatLengthString =
getAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name);
if (jpegInterchangeFormatString != null && jpegInterchangeFormatLengthString != null) {
try {
int jpegInterchangeFormat = Integer.parseInt(jpegInterchangeFormatString);
int jpegInterchangeFormatLength = Integer
.parseInt(jpegInterchangeFormatLengthString);
// The following code limits the size of thumbnail size not to overflow EXIF data area.
jpegInterchangeFormatLength = Math.min(jpegInterchangeFormat
+ jpegInterchangeFormatLength, exifBytes.length) - jpegInterchangeFormat;
if (jpegInterchangeFormat > 0 && jpegInterchangeFormatLength > 0) {
mHasThumbnail = true;
mThumbnailOffset = exifOffsetFromBeginning + jpegInterchangeFormat;
mThumbnailLength = jpegInterchangeFormatLength;
}
} catch (NumberFormatException e) {
// Ignored the corrupted image.
}
}
}
private void addDefaultValuesForCompatibility() {
// The value of DATETIME tag has the same value of DATETIME_ORIGINAL tag.
String valueOfDateTimeOriginal = getAttribute(TAG_DATETIME_ORIGINAL);
if (valueOfDateTimeOriginal != null) {
mAttributes[IFD_TIFF_HINT].put(TAG_DATETIME,
ExifAttribute.createString(valueOfDateTimeOriginal));
}
// Add the default value.
if (getAttribute(TAG_IMAGE_WIDTH) == null) {
mAttributes[IFD_TIFF_HINT].put(TAG_IMAGE_WIDTH,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (getAttribute(TAG_IMAGE_LENGTH) == null) {
mAttributes[IFD_TIFF_HINT].put(TAG_IMAGE_LENGTH,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (getAttribute(TAG_ORIENTATION) == null) {
mAttributes[IFD_TIFF_HINT].put(TAG_ORIENTATION,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (getAttribute(TAG_LIGHT_SOURCE) == null) {
mAttributes[IFD_EXIF_HINT].put(TAG_LIGHT_SOURCE,
ExifAttribute.createULong(0, mExifByteOrder));
}
}
// Reads image file directory, which is a tag group in EXIF.
private void readImageFileDirectory(ByteOrderAwarenessDataInputStream dataInputStream, int hint)
throws IOException {
if (dataInputStream.peek() + 2 > dataInputStream.mLength) {
// Return if there is no data from the offset.
return;
}
// See JEITA CP-3451 Figure 5. page 9.
short numberOfDirectoryEntry = dataInputStream.readShort();
if (dataInputStream.peek() + 12 * numberOfDirectoryEntry > dataInputStream.mLength) {
// Return if the size of entries is too big.
return;
}
if (DEBUG) {
Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry);
}
for (short i = 0; i < numberOfDirectoryEntry; ++i) {
int tagNumber = dataInputStream.readUnsignedShort();
int dataFormat = dataInputStream.readUnsignedShort();
int numberOfComponents = dataInputStream.readInt();
long nextEntryOffset = dataInputStream.peek() + 4; // next four bytes is for data
// offset or value.
// Look up a corresponding tag from tag number
final ExifTag tag = (ExifTag) sExifTagMapsForReading[hint].get(tagNumber);
if (DEBUG) {
Log.d(TAG, String.format("hint: %d, tagNumber: %d, tagName: %s, dataFormat: %d, " +
"numberOfComponents: %d", hint, tagNumber, tag != null ? tag.name : null,
dataFormat, numberOfComponents));
}
if (tag == null || dataFormat <= 0 ||
dataFormat >= IFD_FORMAT_BYTES_PER_FORMAT.length) {
// Skip if the parsed tag number is not defined or invalid data format.
if (tag == null) {
Log.w(TAG, "Skip the tag entry since tag number is not defined: " + tagNumber);
} else {
Log.w(TAG, "Skip the tag entry since data format is invalid: " + dataFormat);
}
dataInputStream.seek(nextEntryOffset);
continue;
}
// Read a value from data field or seek to the value offset which is stored in data
// field if the size of the entry value is bigger than 4.
int byteCount = numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat];
if (byteCount > 4) {
long offset = dataInputStream.readUnsignedInt();
if (DEBUG) {
Log.d(TAG, "seek to data offset: " + offset);
}
if (offset + byteCount <= dataInputStream.mLength) {
dataInputStream.seek(offset);
} else {
// Skip if invalid data offset.
Log.w(TAG, "Skip the tag entry since data offset is invalid: " + offset);
dataInputStream.seek(nextEntryOffset);
continue;
}
}
// Recursively parse IFD when a IFD pointer tag appears.
int innerIfdHint = getIfdHintFromTagNumber(tagNumber);
if (DEBUG) {
Log.d(TAG, "innerIfdHint: " + innerIfdHint + " byteCount: " + byteCount);
}
if (innerIfdHint >= 0) {
long offset = -1L;
// Get offset from data field
switch (dataFormat) {
case IFD_FORMAT_USHORT: {
offset = dataInputStream.readUnsignedShort();
break;
}
case IFD_FORMAT_SSHORT: {
offset = dataInputStream.readShort();
break;
}
case IFD_FORMAT_ULONG: {
offset = dataInputStream.readUnsignedInt();
break;
}
case IFD_FORMAT_SLONG: {
offset = dataInputStream.readInt();
break;
}
default: {
// Nothing to do
break;
}
}
if (DEBUG) {
Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tag.name));
}
if (offset > 0L && offset < dataInputStream.mLength) {
dataInputStream.seek(offset);
readImageFileDirectory(dataInputStream, innerIfdHint);
} else {
Log.w(TAG, "Skip jump into the IFD since its offset is invalid: " + offset);
}
dataInputStream.seek(nextEntryOffset);
continue;
}
byte[] bytes = new byte[numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat]];
dataInputStream.readFully(bytes);
mAttributes[hint].put(
tag.name, new ExifAttribute(dataFormat, numberOfComponents, bytes));
if (dataInputStream.peek() != nextEntryOffset) {
dataInputStream.seek(nextEntryOffset);
}
}
if (dataInputStream.peek() + 4 <= dataInputStream.mLength) {
long nextIfdOffset = dataInputStream.readUnsignedInt();
if (DEBUG) {
Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset));
}
// The next IFD offset needs to be bigger than 8
// since the first IFD offset is at least 8.
if (nextIfdOffset > 8 && nextIfdOffset < dataInputStream.mLength) {
dataInputStream.seek(nextIfdOffset);
readImageFileDirectory(dataInputStream, IFD_THUMBNAIL_HINT);
}
}
}
// Gets the corresponding IFD group index of the given tag number for writing Exif Tags.
private static int getIfdHintFromTagNumber(int tagNumber) {
for (int i = 0; i < IFD_POINTER_TAG_HINTS.length; ++i) {
if (IFD_POINTER_TAGS[i].number == tagNumber) {
return IFD_POINTER_TAG_HINTS[i];
}
}
return -1;
}
// Writes an Exif segment into the given output stream.
private int writeExifSegment(ByteOrderAwarenessDataOutputStream dataOutputStream,
int exifOffsetFromBeginning) throws IOException {
// The following variables are for calculating each IFD tag group size in bytes.
int[] ifdOffsets = new int[EXIF_TAGS.length];
int[] ifdDataSizes = new int[EXIF_TAGS.length];
// Remove IFD pointer tags (we'll re-add it later.)
for (ExifTag tag : IFD_POINTER_TAGS) {
removeAttribute(tag.name);
}
// Remove old thumbnail data
removeAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name);
removeAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name);
// Remove null value tags.
for (int hint = 0; hint < EXIF_TAGS.length; ++hint) {
for (Object obj : mAttributes[hint].entrySet().toArray()) {
final Map.Entry entry = (Map.Entry) obj;
if (entry.getValue() == null) {
mAttributes[hint].remove(entry.getKey());
}
}
}
// Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD
// offset when there is one or more tags in the thumbnail IFD.
if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) {
mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (!mAttributes[IFD_EXIF_HINT].isEmpty()) {
mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (!mAttributes[IFD_GPS_HINT].isEmpty()) {
mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (mHasThumbnail) {
mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name,
ExifAttribute.createULong(0, mExifByteOrder));
mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name,
ExifAttribute.createULong(mThumbnailLength, mExifByteOrder));
}
// Calculate IFD group data area sizes. IFD group data area is assigned to save the entry
// value which has a bigger size than 4 bytes.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
int sum = 0;
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) {
final ExifAttribute exifAttribute = (ExifAttribute) entry.getValue();
final int size = exifAttribute.size();
if (size > 4) {
sum += size;
}
}
ifdDataSizes[i] += sum;
}
// Calculate IFD offsets.
int position = 8;
for (int hint = 0; hint < EXIF_TAGS.length; ++hint) {
if (!mAttributes[hint].isEmpty()) {
ifdOffsets[hint] = position;
position += 2 + mAttributes[hint].size() * 12 + 4 + ifdDataSizes[hint];
}
}
if (mHasThumbnail) {
int thumbnailOffset = position;
mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name,
ExifAttribute.createULong(thumbnailOffset, mExifByteOrder));
mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset;
position += mThumbnailLength;
}
// Calculate the total size
int totalSize = position + 8; // eight bytes is for header part.
if (DEBUG) {
Log.d(TAG, "totalSize length: " + totalSize);
for (int i = 0; i < EXIF_TAGS.length; ++i) {
Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d",
i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i]));
}
}
// Update IFD pointer tags with the calculated offsets.
if (!mAttributes[IFD_EXIF_HINT].isEmpty()) {
mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name,
ExifAttribute.createULong(ifdOffsets[IFD_EXIF_HINT], mExifByteOrder));
}
if (!mAttributes[IFD_GPS_HINT].isEmpty()) {
mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name,
ExifAttribute.createULong(ifdOffsets[IFD_GPS_HINT], mExifByteOrder));
}
if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) {
mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, ExifAttribute.createULong(
ifdOffsets[IFD_INTEROPERABILITY_HINT], mExifByteOrder));
}
// Write TIFF Headers. See JEITA CP-3451C Table 1. page 10.
dataOutputStream.writeUnsignedShort(totalSize);
dataOutputStream.write(IDENTIFIER_EXIF_APP1);
dataOutputStream.writeShort(mExifByteOrder == ByteOrder.BIG_ENDIAN
? BYTE_ALIGN_MM : BYTE_ALIGN_II);
dataOutputStream.setByteOrder(mExifByteOrder);
dataOutputStream.writeUnsignedShort(0x2a);
dataOutputStream.writeUnsignedInt(8);
// Write IFD groups. See JEITA CP-3451C Figure 7. page 12.
for (int hint = 0; hint < EXIF_TAGS.length; ++hint) {
if (!mAttributes[hint].isEmpty()) {
// See JEITA CP-3451C 4.6.2 IFD structure. page 13.
// Write entry count
dataOutputStream.writeUnsignedShort(mAttributes[hint].size());
// Write entry info
int dataOffset = ifdOffsets[hint] + 2 + mAttributes[hint].size() * 12 + 4;
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) {
// Convert tag name to tag number.
final ExifTag tag = (ExifTag) sExifTagMapsForWriting[hint].get(entry.getKey());
final int tagNumber = tag.number;
final ExifAttribute attribute = (ExifAttribute) entry.getValue();
final int size = attribute.size();
dataOutputStream.writeUnsignedShort(tagNumber);
dataOutputStream.writeUnsignedShort(attribute.format);
dataOutputStream.writeInt(attribute.numberOfComponents);
if (size > 4) {
dataOutputStream.writeUnsignedInt(dataOffset);
dataOffset += size;
} else {
dataOutputStream.write(attribute.bytes);
// Fill zero up to 4 bytes
if (size < 4) {
for (int i = size; i < 4; ++i) {
dataOutputStream.writeByte(0);
}
}
}
}
// Write the next offset. It writes the offset of thumbnail IFD if there is one or
// more tags in the thumbnail IFD when the current IFD is the primary image TIFF
// IFD; Otherwise 0.
if (hint == 0 && !mAttributes[IFD_THUMBNAIL_HINT].isEmpty()) {
dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_THUMBNAIL_HINT]);
} else {
dataOutputStream.writeUnsignedInt(0);
}
// Write values of data field exceeding 4 bytes after the next offset.
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) {
ExifAttribute attribute = (ExifAttribute) entry.getValue();
if (attribute.bytes.length > 4) {
dataOutputStream.write(attribute.bytes, 0, attribute.bytes.length);
}
}
}
}
// Write thumbnail
if (mHasThumbnail) {
dataOutputStream.write(getThumbnail());
}
// Reset the byte order to big endian in order to write remaining parts of the JPEG file.
dataOutputStream.setByteOrder(ByteOrder.BIG_ENDIAN);
return totalSize;
}
/**
* Determines the data format of EXIF entry value.
*
* @param entryValue The value to be determined.
* @return Returns two data formats gussed as a pair in integer. If there is no two candidate
data formats for the given entry value, returns {@code -1} in the second of the pair.
*/
private static Pair<Integer, Integer> guessDataFormat(String entryValue) {
// See TIFF 6.0 spec Types. page 15.
// Take the first component if there are more than one component.
if (entryValue.contains(",")) {
String[] entryValues = entryValue.split(",");
Pair<Integer, Integer> dataFormat = guessDataFormat(entryValues[0]);
if (dataFormat.first == IFD_FORMAT_STRING) {
return dataFormat;
}
for (int i = 1; i < entryValues.length; ++i) {
final Pair<Integer, Integer> guessDataFormat = guessDataFormat(entryValues[i]);
int first = -1, second = -1;
if (guessDataFormat.first == dataFormat.first
|| guessDataFormat.second == dataFormat.first) {
first = dataFormat.first;
}
if (dataFormat.second != -1 && (guessDataFormat.first == dataFormat.second
|| guessDataFormat.second == dataFormat.second)) {
second = dataFormat.second;
}
if (first == -1 && second == -1) {
return new Pair<>(IFD_FORMAT_STRING, -1);
}
if (first == -1) {
dataFormat = new Pair<>(second, -1);
continue;
}
if (second == -1) {
dataFormat = new Pair<>(first, -1);
continue;
}
}
return dataFormat;
}
if (entryValue.contains("/")) {
String[] rationalNumber = entryValue.split("/");
if (rationalNumber.length == 2) {
try {
long numerator = Long.parseLong(rationalNumber[0]);
long denominator = Long.parseLong(rationalNumber[1]);
if (numerator < 0L || denominator < 0L) {
return new Pair<>(IFD_FORMAT_SRATIONAL, - 1);
}
if (numerator > Integer.MAX_VALUE || denominator > Integer.MAX_VALUE) {
return new Pair<>(IFD_FORMAT_URATIONAL, -1);
}
return new Pair<>(IFD_FORMAT_SRATIONAL, IFD_FORMAT_URATIONAL);
} catch (NumberFormatException e) {
// Ignored
}
}
return new Pair<>(IFD_FORMAT_STRING, -1);
}
try {
Long longValue = Long.parseLong(entryValue);
if (longValue >= 0 && longValue <= 65535) {
return new Pair<>(IFD_FORMAT_USHORT, IFD_FORMAT_ULONG);
}
if (longValue < 0) {
return new Pair<>(IFD_FORMAT_SLONG, -1);
}
return new Pair<>(IFD_FORMAT_ULONG, -1);
} catch (NumberFormatException e) {
// Ignored
}
try {
Double.parseDouble(entryValue);
return new Pair<>(IFD_FORMAT_DOUBLE, -1);
} catch (NumberFormatException e) {
// Ignored
}
return new Pair<>(IFD_FORMAT_STRING, -1);
}
// An input stream to parse EXIF data area, which can be written in either little or big endian
// order.
private static class ByteOrderAwarenessDataInputStream extends ByteArrayInputStream {
private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN;
private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN;
private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN;
private final long mLength;
private long mPosition;
public ByteOrderAwarenessDataInputStream(byte[] bytes) {
super(bytes);
mLength = bytes.length;
mPosition = 0L;
}
public void setByteOrder(ByteOrder byteOrder) {
mByteOrder = byteOrder;
}
public void seek(long byteCount) throws IOException {
mPosition = 0L;
reset();
if (skip(byteCount) != byteCount) {
throw new IOException("Couldn't seek up to the byteCount");
}
}
public long peek() {
return mPosition;
}
public void readFully(byte[] buffer) throws IOException {
mPosition += buffer.length;
if (mPosition > mLength) {
throw new EOFException();
}
if (super.read(buffer, 0, buffer.length) != buffer.length) {
throw new IOException("Couldn't read up to the length of buffer");
}
}
public byte readByte() throws IOException {
++mPosition;
if (mPosition > mLength) {
throw new EOFException();
}
int ch = super.read();
if (ch < 0) {
throw new EOFException();
}
return (byte) ch;
}
public short readShort() throws IOException {
mPosition += 2;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = super.read();
int ch2 = super.read();
if ((ch1 | ch2) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return (short) ((ch2 << 8) + (ch1));
} else if (mByteOrder == BIG_ENDIAN) {
return (short) ((ch1 << 8) + (ch2));
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
public int readInt() throws IOException {
mPosition += 4;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = super.read();
int ch2 = super.read();
int ch3 = super.read();
int ch4 = super.read();
if ((ch1 | ch2 | ch3 | ch4) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1);
} else if (mByteOrder == BIG_ENDIAN) {
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4);
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
@Override
public long skip(long byteCount) {
long skipped = super.skip(Math.min(byteCount, mLength - mPosition));
mPosition += skipped;
return skipped;
}
public int readUnsignedShort() throws IOException {
mPosition += 2;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = super.read();
int ch2 = super.read();
if ((ch1 | ch2) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return ((ch2 << 8) + (ch1));
} else if (mByteOrder == BIG_ENDIAN) {
return ((ch1 << 8) + (ch2));
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
public long readUnsignedInt() throws IOException {
return readInt() & 0xffffffffL;
}
public long readLong() throws IOException {
mPosition += 8;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = super.read();
int ch2 = super.read();
int ch3 = super.read();
int ch4 = super.read();
int ch5 = super.read();
int ch6 = super.read();
int ch7 = super.read();
int ch8 = super.read();
if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40)
+ ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16)
+ ((long) ch2 << 8) + ch1);
} else if (mByteOrder == BIG_ENDIAN) {
return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40)
+ ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16)
+ ((long) ch7 << 8) + ch8);
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
public double readDouble() throws IOException {
return Double.longBitsToDouble(readLong());
}
}
// An output stream to write EXIF data area, which can be written in either little or big endian
// order.
private static class ByteOrderAwarenessDataOutputStream extends FilterOutputStream {
private final OutputStream mOutputStream;
private ByteOrder mByteOrder;
public ByteOrderAwarenessDataOutputStream(OutputStream out, ByteOrder byteOrder) {
super(out);
mOutputStream = out;
mByteOrder = byteOrder;
}
public void setByteOrder(ByteOrder byteOrder) {
mByteOrder = byteOrder;
}
public void write(byte[] bytes) throws IOException {
mOutputStream.write(bytes);
}
public void write(byte[] bytes, int offset, int length) throws IOException {
mOutputStream.write(bytes, offset, length);
}
public void writeByte(int val) throws IOException {
mOutputStream.write(val);
}
public void writeShort(short val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeInt(int val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 24) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 24) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeUnsignedShort(int val) throws IOException {
writeShort((short) val);
}
public void writeUnsignedInt(long val) throws IOException {
writeInt((int) val);
}
}
}