ExifInterface.java revision 0ae6bdfe37e8a41cfdc74f3b5f9add2ed40394a0
1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.media; 18 19import android.annotation.NonNull; 20import android.content.res.AssetManager; 21import android.graphics.Bitmap; 22import android.graphics.BitmapFactory; 23import android.system.ErrnoException; 24import android.system.Os; 25import android.system.OsConstants; 26import android.util.Log; 27 28import java.io.BufferedInputStream; 29import java.io.ByteArrayInputStream; 30import java.io.DataInputStream; 31import java.io.DataOutputStream; 32import java.io.EOFException; 33import java.io.File; 34import java.io.FileDescriptor; 35import java.io.FileInputStream; 36import java.io.FileNotFoundException; 37import java.io.FileOutputStream; 38import java.io.IOException; 39import java.io.InputStream; 40import java.io.OutputStream; 41import java.nio.ByteOrder; 42import java.nio.charset.Charset; 43import java.text.ParsePosition; 44import java.text.SimpleDateFormat; 45import java.util.Arrays; 46import java.util.Date; 47import java.util.HashMap; 48import java.util.Map; 49import java.util.Set; 50import java.util.TimeZone; 51import java.util.regex.Pattern; 52 53import libcore.io.IoUtils; 54import libcore.io.Streams; 55 56/** 57 * This is a class for reading and writing Exif tags in a JPEG file or a RAW image file. 58 * <p> 59 * Supported formats are: JPEG, DNG, CR2, NEF, NRW, ARW, RW2, ORF and RAF. 60 * <p> 61 * Attribute mutation is supported for JPEG image files. 62 */ 63public class ExifInterface { 64 private static final String TAG = "ExifInterface"; 65 private static final boolean DEBUG = false; 66 67 // The Exif tag names 68 /** Type is String. */ 69 public static final String TAG_ARTIST = "Artist"; 70 /** Type is int. */ 71 public static final String TAG_BITS_PER_SAMPLE = "BitsPerSample"; 72 /** Type is int. */ 73 public static final String TAG_COMPRESSION = "Compression"; 74 /** Type is String. */ 75 public static final String TAG_COPYRIGHT = "Copyright"; 76 /** Type is String. */ 77 public static final String TAG_DATETIME = "DateTime"; 78 /** Type is String. */ 79 public static final String TAG_IMAGE_DESCRIPTION = "ImageDescription"; 80 /** Type is int. */ 81 public static final String TAG_IMAGE_LENGTH = "ImageLength"; 82 /** Type is int. */ 83 public static final String TAG_IMAGE_WIDTH = "ImageWidth"; 84 /** Type is int. */ 85 public static final String TAG_JPEG_INTERCHANGE_FORMAT = "JPEGInterchangeFormat"; 86 /** Type is int. */ 87 public static final String TAG_JPEG_INTERCHANGE_FORMAT_LENGTH = "JPEGInterchangeFormatLength"; 88 /** Type is String. */ 89 public static final String TAG_MAKE = "Make"; 90 /** Type is String. */ 91 public static final String TAG_MODEL = "Model"; 92 /** Type is int. */ 93 public static final String TAG_ORIENTATION = "Orientation"; 94 /** Type is int. */ 95 public static final String TAG_PHOTOMETRIC_INTERPRETATION = "PhotometricInterpretation"; 96 /** Type is int. */ 97 public static final String TAG_PLANAR_CONFIGURATION = "PlanarConfiguration"; 98 /** Type is rational. */ 99 public static final String TAG_PRIMARY_CHROMATICITIES = "PrimaryChromaticities"; 100 /** Type is rational. */ 101 public static final String TAG_REFERENCE_BLACK_WHITE = "ReferenceBlackWhite"; 102 /** Type is int. */ 103 public static final String TAG_RESOLUTION_UNIT = "ResolutionUnit"; 104 /** Type is int. */ 105 public static final String TAG_ROWS_PER_STRIP = "RowsPerStrip"; 106 /** Type is int. */ 107 public static final String TAG_SAMPLES_PER_PIXEL = "SamplesPerPixel"; 108 /** Type is String. */ 109 public static final String TAG_SOFTWARE = "Software"; 110 /** Type is int. */ 111 public static final String TAG_STRIP_BYTE_COUNTS = "StripByteCounts"; 112 /** Type is int. */ 113 public static final String TAG_STRIP_OFFSETS = "StripOffsets"; 114 /** Type is int. */ 115 public static final String TAG_TRANSFER_FUNCTION = "TransferFunction"; 116 /** Type is rational. */ 117 public static final String TAG_WHITE_POINT = "WhitePoint"; 118 /** Type is rational. */ 119 public static final String TAG_X_RESOLUTION = "XResolution"; 120 /** Type is rational. */ 121 public static final String TAG_Y_CB_CR_COEFFICIENTS = "YCbCrCoefficients"; 122 /** Type is int. */ 123 public static final String TAG_Y_CB_CR_POSITIONING = "YCbCrPositioning"; 124 /** Type is int. */ 125 public static final String TAG_Y_CB_CR_SUB_SAMPLING = "YCbCrSubSampling"; 126 /** Type is rational. */ 127 public static final String TAG_Y_RESOLUTION = "YResolution"; 128 /** Type is rational. */ 129 public static final String TAG_APERTURE_VALUE = "ApertureValue"; 130 /** Type is rational. */ 131 public static final String TAG_BRIGHTNESS_VALUE = "BrightnessValue"; 132 /** Type is String. */ 133 public static final String TAG_CFA_PATTERN = "CFAPattern"; 134 /** Type is int. */ 135 public static final String TAG_COLOR_SPACE = "ColorSpace"; 136 /** Type is String. */ 137 public static final String TAG_COMPONENTS_CONFIGURATION = "ComponentsConfiguration"; 138 /** Type is rational. */ 139 public static final String TAG_COMPRESSED_BITS_PER_PIXEL = "CompressedBitsPerPixel"; 140 /** Type is int. */ 141 public static final String TAG_CONTRAST = "Contrast"; 142 /** Type is int. */ 143 public static final String TAG_CUSTOM_RENDERED = "CustomRendered"; 144 /** Type is String. */ 145 public static final String TAG_DATETIME_DIGITIZED = "DateTimeDigitized"; 146 /** Type is String. */ 147 public static final String TAG_DATETIME_ORIGINAL = "DateTimeOriginal"; 148 /** Type is String. */ 149 public static final String TAG_DEVICE_SETTING_DESCRIPTION = "DeviceSettingDescription"; 150 /** Type is double. */ 151 public static final String TAG_DIGITAL_ZOOM_RATIO = "DigitalZoomRatio"; 152 /** Type is String. */ 153 public static final String TAG_EXIF_VERSION = "ExifVersion"; 154 /** Type is double. */ 155 public static final String TAG_EXPOSURE_BIAS_VALUE = "ExposureBiasValue"; 156 /** Type is rational. */ 157 public static final String TAG_EXPOSURE_INDEX = "ExposureIndex"; 158 /** Type is int. */ 159 public static final String TAG_EXPOSURE_MODE = "ExposureMode"; 160 /** Type is int. */ 161 public static final String TAG_EXPOSURE_PROGRAM = "ExposureProgram"; 162 /** Type is double. */ 163 public static final String TAG_EXPOSURE_TIME = "ExposureTime"; 164 /** Type is double. */ 165 public static final String TAG_F_NUMBER = "FNumber"; 166 /** 167 * Type is double. 168 * 169 * @deprecated use {@link #TAG_F_NUMBER} instead 170 */ 171 @Deprecated 172 public static final String TAG_APERTURE = "FNumber"; 173 /** Type is String. */ 174 public static final String TAG_FILE_SOURCE = "FileSource"; 175 /** Type is int. */ 176 public static final String TAG_FLASH = "Flash"; 177 /** Type is rational. */ 178 public static final String TAG_FLASH_ENERGY = "FlashEnergy"; 179 /** Type is String. */ 180 public static final String TAG_FLASHPIX_VERSION = "FlashpixVersion"; 181 /** Type is rational. */ 182 public static final String TAG_FOCAL_LENGTH = "FocalLength"; 183 /** Type is int. */ 184 public static final String TAG_FOCAL_LENGTH_IN_35MM_FILM = "FocalLengthIn35mmFilm"; 185 /** Type is int. */ 186 public static final String TAG_FOCAL_PLANE_RESOLUTION_UNIT = "FocalPlaneResolutionUnit"; 187 /** Type is rational. */ 188 public static final String TAG_FOCAL_PLANE_X_RESOLUTION = "FocalPlaneXResolution"; 189 /** Type is rational. */ 190 public static final String TAG_FOCAL_PLANE_Y_RESOLUTION = "FocalPlaneYResolution"; 191 /** Type is rational. */ 192 public static final String TAG_GAIN_CONTROL = "GainControl"; 193 /** Type is int. */ 194 public static final String TAG_ISO_SPEED_RATINGS = "ISOSpeedRatings"; 195 /** 196 * Type is int. 197 * 198 * @deprecated use {@link #TAG_ISO_SPEED_RATINGS} instead 199 */ 200 @Deprecated 201 public static final String TAG_ISO = "ISOSpeedRatings"; 202 /** Type is String. */ 203 public static final String TAG_IMAGE_UNIQUE_ID = "ImageUniqueID"; 204 /** Type is int. */ 205 public static final String TAG_LIGHT_SOURCE = "LightSource"; 206 /** Type is String. */ 207 public static final String TAG_MAKER_NOTE = "MakerNote"; 208 /** Type is rational. */ 209 public static final String TAG_MAX_APERTURE_VALUE = "MaxApertureValue"; 210 /** Type is int. */ 211 public static final String TAG_METERING_MODE = "MeteringMode"; 212 /** Type is String. */ 213 public static final String TAG_OECF = "OECF"; 214 /** Type is int. */ 215 public static final String TAG_PIXEL_X_DIMENSION = "PixelXDimension"; 216 /** Type is int. */ 217 public static final String TAG_PIXEL_Y_DIMENSION = "PixelYDimension"; 218 /** Type is String. */ 219 public static final String TAG_RELATED_SOUND_FILE = "RelatedSoundFile"; 220 /** Type is int. */ 221 public static final String TAG_SATURATION = "Saturation"; 222 /** Type is int. */ 223 public static final String TAG_SCENE_CAPTURE_TYPE = "SceneCaptureType"; 224 /** Type is String. */ 225 public static final String TAG_SCENE_TYPE = "SceneType"; 226 /** Type is int. */ 227 public static final String TAG_SENSING_METHOD = "SensingMethod"; 228 /** Type is int. */ 229 public static final String TAG_SHARPNESS = "Sharpness"; 230 /** Type is rational. */ 231 public static final String TAG_SHUTTER_SPEED_VALUE = "ShutterSpeedValue"; 232 /** Type is String. */ 233 public static final String TAG_SPATIAL_FREQUENCY_RESPONSE = "SpatialFrequencyResponse"; 234 /** Type is String. */ 235 public static final String TAG_SPECTRAL_SENSITIVITY = "SpectralSensitivity"; 236 /** Type is int. */ 237 public static final String TAG_SUBSEC_TIME = "SubSecTime"; 238 /** Type is int. @hide */ 239 public static final String TAG_SUBSECTIME = "SubSecTime"; 240 /** Type is int. */ 241 public static final String TAG_SUBSEC_TIME_DIGITIZED = "SubSecTimeDigitized"; 242 /** Type is int. */ 243 public static final String TAG_SUBSEC_TIME_DIG = "SubSecTimeDigitized"; 244 /** Type is int. */ 245 public static final String TAG_SUBSEC_TIME_ORIG = "SubSecTimeOriginal"; 246 /** Type is int. */ 247 public static final String TAG_SUBSEC_TIME_ORIGINAL = "SubSecTimeOriginal"; 248 /** Type is int. */ 249 public static final String TAG_SUBJECT_AREA = "SubjectArea"; 250 /** Type is double. */ 251 public static final String TAG_SUBJECT_DISTANCE = "SubjectDistance"; 252 /** Type is int. */ 253 public static final String TAG_SUBJECT_DISTANCE_RANGE = "SubjectDistanceRange"; 254 /** Type is int. */ 255 public static final String TAG_SUBJECT_LOCATION = "SubjectLocation"; 256 /** Type is String. */ 257 public static final String TAG_USER_COMMENT = "UserComment"; 258 /** Type is int. */ 259 public static final String TAG_WHITE_BALANCE = "WhiteBalance"; 260 /** 261 * The altitude (in meters) based on the reference in TAG_GPS_ALTITUDE_REF. 262 * Type is rational. 263 */ 264 public static final String TAG_GPS_ALTITUDE = "GPSAltitude"; 265 /** 266 * 0 if the altitude is above sea level. 1 if the altitude is below sea 267 * level. Type is int. 268 */ 269 public static final String TAG_GPS_ALTITUDE_REF = "GPSAltitudeRef"; 270 /** Type is String. */ 271 public static final String TAG_GPS_AREA_INFORMATION = "GPSAreaInformation"; 272 /** Type is rational. */ 273 public static final String TAG_GPS_DOP = "GPSDOP"; 274 /** Type is String. */ 275 public static final String TAG_GPS_DATESTAMP = "GPSDateStamp"; 276 /** Type is rational. */ 277 public static final String TAG_GPS_DEST_BEARING = "GPSDestBearing"; 278 /** Type is String. */ 279 public static final String TAG_GPS_DEST_BEARING_REF = "GPSDestBearingRef"; 280 /** Type is rational. */ 281 public static final String TAG_GPS_DEST_DISTANCE = "GPSDestDistance"; 282 /** Type is String. */ 283 public static final String TAG_GPS_DEST_DISTANCE_REF = "GPSDestDistanceRef"; 284 /** Type is rational. */ 285 public static final String TAG_GPS_DEST_LATITUDE = "GPSDestLatitude"; 286 /** Type is String. */ 287 public static final String TAG_GPS_DEST_LATITUDE_REF = "GPSDestLatitudeRef"; 288 /** Type is rational. */ 289 public static final String TAG_GPS_DEST_LONGITUDE = "GPSDestLongitude"; 290 /** Type is String. */ 291 public static final String TAG_GPS_DEST_LONGITUDE_REF = "GPSDestLongitudeRef"; 292 /** Type is int. */ 293 public static final String TAG_GPS_DIFFERENTIAL = "GPSDifferential"; 294 /** Type is rational. */ 295 public static final String TAG_GPS_IMG_DIRECTION = "GPSImgDirection"; 296 /** Type is String. */ 297 public static final String TAG_GPS_IMG_DIRECTION_REF = "GPSImgDirectionRef"; 298 /** String. Format is "num1/denom1,num2/denom2,num3/denom3". */ 299 public static final String TAG_GPS_LATITUDE = "GPSLatitude"; 300 /** Type is String. */ 301 public static final String TAG_GPS_LATITUDE_REF = "GPSLatitudeRef"; 302 /** String. Format is "num1/denom1,num2/denom2,num3/denom3". */ 303 public static final String TAG_GPS_LONGITUDE = "GPSLongitude"; 304 /** Type is String. */ 305 public static final String TAG_GPS_LONGITUDE_REF = "GPSLongitudeRef"; 306 /** Type is String. */ 307 public static final String TAG_GPS_MAP_DATUM = "GPSMapDatum"; 308 /** Type is String. */ 309 public static final String TAG_GPS_MEASURE_MODE = "GPSMeasureMode"; 310 /** Type is String. Name of GPS processing method used for location finding. */ 311 public static final String TAG_GPS_PROCESSING_METHOD = "GPSProcessingMethod"; 312 /** Type is String. */ 313 public static final String TAG_GPS_SATELLITES = "GPSSatellites"; 314 /** Type is rational. */ 315 public static final String TAG_GPS_SPEED = "GPSSpeed"; 316 /** Type is String. */ 317 public static final String TAG_GPS_SPEED_REF = "GPSSpeedRef"; 318 /** Type is String. */ 319 public static final String TAG_GPS_STATUS = "GPSStatus"; 320 /** Type is String. */ 321 public static final String TAG_GPS_TIMESTAMP = "GPSTimeStamp"; 322 /** Type is rational. */ 323 public static final String TAG_GPS_TRACK = "GPSTrack"; 324 /** Type is String. */ 325 public static final String TAG_GPS_TRACK_REF = "GPSTrackRef"; 326 /** Type is String. */ 327 public static final String TAG_GPS_VERSION_ID = "GPSVersionID"; 328 /** Type is String. */ 329 public static final String TAG_INTEROPERABILITY_INDEX = "InteroperabilityIndex"; 330 /** Type is int. */ 331 public static final String TAG_THUMBNAIL_IMAGE_LENGTH = "ThumbnailImageLength"; 332 /** Type is int. */ 333 public static final String TAG_THUMBNAIL_IMAGE_WIDTH = "ThumbnailImageWidth"; 334 335 // Private tags used for pointing the other IFD offset. The types of the following tags are int. 336 private static final String TAG_EXIF_IFD_POINTER = "ExifIFDPointer"; 337 private static final String TAG_GPS_INFO_IFD_POINTER = "GPSInfoIFDPointer"; 338 private static final String TAG_INTEROPERABILITY_IFD_POINTER = "InteroperabilityIFDPointer"; 339 340 // Private tags used for thumbnail information. 341 private static final String TAG_HAS_THUMBNAIL = "hasThumbnail"; 342 private static final String TAG_THUMBNAIL_OFFSET = "thumbnailOffset"; 343 private static final String TAG_THUMBNAIL_LENGTH = "thumbnailLength"; 344 private static final String TAG_THUMBNAIL_DATA = "thumbnailData"; 345 346 // Constants used for the Orientation Exif tag. 347 public static final int ORIENTATION_UNDEFINED = 0; 348 public static final int ORIENTATION_NORMAL = 1; 349 public static final int ORIENTATION_FLIP_HORIZONTAL = 2; // left right reversed mirror 350 public static final int ORIENTATION_ROTATE_180 = 3; 351 public static final int ORIENTATION_FLIP_VERTICAL = 4; // upside down mirror 352 // flipped about top-left <--> bottom-right axis 353 public static final int ORIENTATION_TRANSPOSE = 5; 354 public static final int ORIENTATION_ROTATE_90 = 6; // rotate 90 cw to right it 355 // flipped about top-right <--> bottom-left axis 356 public static final int ORIENTATION_TRANSVERSE = 7; 357 public static final int ORIENTATION_ROTATE_270 = 8; // rotate 270 to right it 358 359 // Constants used for white balance 360 public static final int WHITEBALANCE_AUTO = 0; 361 public static final int WHITEBALANCE_MANUAL = 1; 362 363 private static final byte[] JPEG_SIGNATURE = new byte[] {(byte) 0xff, (byte) 0xd8, (byte) 0xff}; 364 private static final int JPEG_SIGNATURE_SIZE = 3; 365 366 private static SimpleDateFormat sFormatter; 367 368 // See Exchangeable image file format for digital still cameras: Exif version 2.2. 369 // The following values are for parsing EXIF data area. There are tag groups in EXIF data area. 370 // They are called "Image File Directory". They have multiple data formats to cover various 371 // image metadata from GPS longitude to camera model name. 372 373 // Types of Exif byte alignments (see JEITA CP-3451 page 10) 374 private static final short BYTE_ALIGN_II = 0x4949; // II: Intel order 375 private static final short BYTE_ALIGN_MM = 0x4d4d; // MM: Motorola order 376 377 // Formats for the value in IFD entry (See TIFF 6.0 spec Types page 15). 378 private static final int IFD_FORMAT_BYTE = 1; 379 private static final int IFD_FORMAT_STRING = 2; 380 private static final int IFD_FORMAT_USHORT = 3; 381 private static final int IFD_FORMAT_ULONG = 4; 382 private static final int IFD_FORMAT_URATIONAL = 5; 383 private static final int IFD_FORMAT_SBYTE = 6; 384 private static final int IFD_FORMAT_UNDEFINED = 7; 385 private static final int IFD_FORMAT_SSHORT = 8; 386 private static final int IFD_FORMAT_SLONG = 9; 387 private static final int IFD_FORMAT_SRATIONAL = 10; 388 private static final int IFD_FORMAT_SINGLE = 11; 389 private static final int IFD_FORMAT_DOUBLE = 12; 390 // Sizes of the components of each IFD value format 391 private static final int[] IFD_FORMAT_BYTES_PER_FORMAT = new int[] { 392 0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8 393 }; 394 private static final byte[] EXIF_ASCII_PREFIX = new byte[] { 395 0x41, 0x53, 0x43, 0x49, 0x49, 0x0, 0x0, 0x0 396 }; 397 398 // A class for indicating EXIF tag. 399 private static class ExifTag { 400 public final int number; 401 public final String name; 402 403 private ExifTag(String name, int number) { 404 this.name = name; 405 this.number = number; 406 } 407 } 408 409 // Primary image IFD TIFF tags (See JEITA CP-3451 Table 14. page 54). 410 private static final ExifTag[] IFD_TIFF_TAGS = new ExifTag[] { 411 new ExifTag(TAG_IMAGE_WIDTH, 256), 412 new ExifTag(TAG_IMAGE_LENGTH, 257), 413 new ExifTag(TAG_BITS_PER_SAMPLE, 258), 414 new ExifTag(TAG_COMPRESSION, 259), 415 new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262), 416 new ExifTag(TAG_IMAGE_DESCRIPTION, 270), 417 new ExifTag(TAG_MAKE, 271), 418 new ExifTag(TAG_MODEL, 272), 419 new ExifTag(TAG_STRIP_OFFSETS, 273), 420 new ExifTag(TAG_ORIENTATION, 274), 421 new ExifTag(TAG_SAMPLES_PER_PIXEL, 277), 422 new ExifTag(TAG_ROWS_PER_STRIP, 278), 423 new ExifTag(TAG_STRIP_BYTE_COUNTS, 279), 424 new ExifTag(TAG_X_RESOLUTION, 282), 425 new ExifTag(TAG_Y_RESOLUTION, 283), 426 new ExifTag(TAG_PLANAR_CONFIGURATION, 284), 427 new ExifTag(TAG_RESOLUTION_UNIT, 296), 428 new ExifTag(TAG_TRANSFER_FUNCTION, 301), 429 new ExifTag(TAG_SOFTWARE, 305), 430 new ExifTag(TAG_DATETIME, 306), 431 new ExifTag(TAG_ARTIST, 315), 432 new ExifTag(TAG_WHITE_POINT, 318), 433 new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319), 434 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513), 435 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514), 436 new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529), 437 new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530), 438 new ExifTag(TAG_Y_CB_CR_POSITIONING, 531), 439 new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532), 440 new ExifTag(TAG_COPYRIGHT, 33432), 441 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 442 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 443 }; 444 // Primary image IFD Exif Private tags (See JEITA CP-3451 Table 15. page 55). 445 private static final ExifTag[] IFD_EXIF_TAGS = new ExifTag[] { 446 new ExifTag(TAG_EXPOSURE_TIME, 33434), 447 new ExifTag(TAG_F_NUMBER, 33437), 448 new ExifTag(TAG_EXPOSURE_PROGRAM, 34850), 449 new ExifTag(TAG_SPECTRAL_SENSITIVITY, 34852), 450 new ExifTag(TAG_ISO, 34855), 451 new ExifTag(TAG_OECF, 34856), 452 new ExifTag(TAG_EXIF_VERSION, 36864), 453 new ExifTag(TAG_DATETIME_ORIGINAL, 36867), 454 new ExifTag(TAG_DATETIME_DIGITIZED, 36868), 455 new ExifTag(TAG_COMPONENTS_CONFIGURATION, 37121), 456 new ExifTag(TAG_COMPRESSED_BITS_PER_PIXEL, 37122), 457 new ExifTag(TAG_SHUTTER_SPEED_VALUE, 37377), 458 new ExifTag(TAG_APERTURE_VALUE, 37378), 459 new ExifTag(TAG_BRIGHTNESS_VALUE, 37379), 460 new ExifTag(TAG_EXPOSURE_BIAS_VALUE, 37380), 461 new ExifTag(TAG_MAX_APERTURE_VALUE, 37381), 462 new ExifTag(TAG_SUBJECT_DISTANCE, 37382), 463 new ExifTag(TAG_METERING_MODE, 37383), 464 new ExifTag(TAG_LIGHT_SOURCE, 37384), 465 new ExifTag(TAG_FLASH, 37385), 466 new ExifTag(TAG_FOCAL_LENGTH, 37386), 467 new ExifTag(TAG_SUBJECT_AREA, 37396), 468 new ExifTag(TAG_MAKER_NOTE, 37500), 469 new ExifTag(TAG_USER_COMMENT, 37510), 470 new ExifTag(TAG_SUBSEC_TIME, 37520), 471 new ExifTag(TAG_SUBSEC_TIME_ORIG, 37521), 472 new ExifTag(TAG_SUBSEC_TIME_DIG, 37522), 473 new ExifTag(TAG_FLASHPIX_VERSION, 40960), 474 new ExifTag(TAG_COLOR_SPACE, 40961), 475 new ExifTag(TAG_PIXEL_X_DIMENSION, 40962), 476 new ExifTag(TAG_PIXEL_Y_DIMENSION, 40963), 477 new ExifTag(TAG_RELATED_SOUND_FILE, 40964), 478 new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965), 479 new ExifTag(TAG_FLASH_ENERGY, 41483), 480 new ExifTag(TAG_SPATIAL_FREQUENCY_RESPONSE, 41484), 481 new ExifTag(TAG_FOCAL_PLANE_X_RESOLUTION, 41486), 482 new ExifTag(TAG_FOCAL_PLANE_Y_RESOLUTION, 41487), 483 new ExifTag(TAG_FOCAL_PLANE_RESOLUTION_UNIT, 41488), 484 new ExifTag(TAG_SUBJECT_LOCATION, 41492), 485 new ExifTag(TAG_EXPOSURE_INDEX, 41493), 486 new ExifTag(TAG_SENSING_METHOD, 41495), 487 new ExifTag(TAG_FILE_SOURCE, 41728), 488 new ExifTag(TAG_SCENE_TYPE, 41729), 489 new ExifTag(TAG_CFA_PATTERN, 41730), 490 new ExifTag(TAG_CUSTOM_RENDERED, 41985), 491 new ExifTag(TAG_EXPOSURE_MODE, 41986), 492 new ExifTag(TAG_WHITE_BALANCE, 41987), 493 new ExifTag(TAG_DIGITAL_ZOOM_RATIO, 41988), 494 new ExifTag(TAG_FOCAL_LENGTH_IN_35MM_FILM, 41989), 495 new ExifTag(TAG_SCENE_CAPTURE_TYPE, 41990), 496 new ExifTag(TAG_GAIN_CONTROL, 41991), 497 new ExifTag(TAG_CONTRAST, 41992), 498 new ExifTag(TAG_SATURATION, 41993), 499 new ExifTag(TAG_SHARPNESS, 41994), 500 new ExifTag(TAG_DEVICE_SETTING_DESCRIPTION, 41995), 501 new ExifTag(TAG_SUBJECT_DISTANCE_RANGE, 41996), 502 new ExifTag(TAG_IMAGE_UNIQUE_ID, 42016), 503 }; 504 // Primary image IFD GPS Info tags (See JEITA CP-3451 Table 16. page 56). 505 private static final ExifTag[] IFD_GPS_TAGS = new ExifTag[] { 506 new ExifTag(TAG_GPS_VERSION_ID, 0), 507 new ExifTag(TAG_GPS_LATITUDE_REF, 1), 508 new ExifTag(TAG_GPS_LATITUDE, 2), 509 new ExifTag(TAG_GPS_LONGITUDE_REF, 3), 510 new ExifTag(TAG_GPS_LONGITUDE, 4), 511 new ExifTag(TAG_GPS_ALTITUDE_REF, 5), 512 new ExifTag(TAG_GPS_ALTITUDE, 6), 513 new ExifTag(TAG_GPS_TIMESTAMP, 7), 514 new ExifTag(TAG_GPS_SATELLITES, 8), 515 new ExifTag(TAG_GPS_STATUS, 9), 516 new ExifTag(TAG_GPS_MEASURE_MODE, 10), 517 new ExifTag(TAG_GPS_DOP, 11), 518 new ExifTag(TAG_GPS_SPEED_REF, 12), 519 new ExifTag(TAG_GPS_SPEED, 13), 520 new ExifTag(TAG_GPS_TRACK_REF, 14), 521 new ExifTag(TAG_GPS_TRACK, 15), 522 new ExifTag(TAG_GPS_IMG_DIRECTION_REF, 16), 523 new ExifTag(TAG_GPS_IMG_DIRECTION, 17), 524 new ExifTag(TAG_GPS_MAP_DATUM, 18), 525 new ExifTag(TAG_GPS_DEST_LATITUDE_REF, 19), 526 new ExifTag(TAG_GPS_DEST_LATITUDE, 20), 527 new ExifTag(TAG_GPS_DEST_LONGITUDE_REF, 21), 528 new ExifTag(TAG_GPS_DEST_LONGITUDE, 22), 529 new ExifTag(TAG_GPS_DEST_BEARING_REF, 23), 530 new ExifTag(TAG_GPS_DEST_BEARING, 24), 531 new ExifTag(TAG_GPS_DEST_DISTANCE_REF, 25), 532 new ExifTag(TAG_GPS_DEST_DISTANCE, 26), 533 new ExifTag(TAG_GPS_PROCESSING_METHOD, 27), 534 new ExifTag(TAG_GPS_AREA_INFORMATION, 28), 535 new ExifTag(TAG_GPS_DATESTAMP, 29), 536 new ExifTag(TAG_GPS_DIFFERENTIAL, 30), 537 }; 538 // Primary image IFD Interoperability tag (See JEITA CP-3451 Table 17. page 56). 539 private static final ExifTag[] IFD_INTEROPERABILITY_TAGS = new ExifTag[] { 540 new ExifTag(TAG_INTEROPERABILITY_INDEX, 1), 541 }; 542 // IFD Thumbnail tags (See JEITA CP-3451 Table 18. page 57). 543 private static final ExifTag[] IFD_THUMBNAIL_TAGS = new ExifTag[] { 544 new ExifTag(TAG_THUMBNAIL_IMAGE_WIDTH, 256), 545 new ExifTag(TAG_THUMBNAIL_IMAGE_LENGTH, 257), 546 new ExifTag(TAG_BITS_PER_SAMPLE, 258), 547 new ExifTag(TAG_COMPRESSION, 259), 548 new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262), 549 new ExifTag(TAG_IMAGE_DESCRIPTION, 270), 550 new ExifTag(TAG_MAKE, 271), 551 new ExifTag(TAG_MODEL, 272), 552 new ExifTag(TAG_STRIP_OFFSETS, 273), 553 new ExifTag(TAG_ORIENTATION, 274), 554 new ExifTag(TAG_SAMPLES_PER_PIXEL, 277), 555 new ExifTag(TAG_ROWS_PER_STRIP, 278), 556 new ExifTag(TAG_STRIP_BYTE_COUNTS, 279), 557 new ExifTag(TAG_X_RESOLUTION, 282), 558 new ExifTag(TAG_Y_RESOLUTION, 283), 559 new ExifTag(TAG_PLANAR_CONFIGURATION, 284), 560 new ExifTag(TAG_RESOLUTION_UNIT, 296), 561 new ExifTag(TAG_TRANSFER_FUNCTION, 301), 562 new ExifTag(TAG_SOFTWARE, 305), 563 new ExifTag(TAG_DATETIME, 306), 564 new ExifTag(TAG_ARTIST, 315), 565 new ExifTag(TAG_WHITE_POINT, 318), 566 new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319), 567 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513), 568 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514), 569 new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529), 570 new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530), 571 new ExifTag(TAG_Y_CB_CR_POSITIONING, 531), 572 new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532), 573 new ExifTag(TAG_COPYRIGHT, 33432), 574 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 575 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 576 }; 577 578 // See JEITA CP-3451 Figure 5. page 9. 579 // The following values are used for indicating pointers to the other Image File Directorys. 580 581 // Indices of Exif Ifd tag groups 582 private static final int IFD_TIFF_HINT = 0; 583 private static final int IFD_EXIF_HINT = 1; 584 private static final int IFD_GPS_HINT = 2; 585 private static final int IFD_INTEROPERABILITY_HINT = 3; 586 private static final int IFD_THUMBNAIL_HINT = 4; 587 // List of Exif tag groups 588 private static final ExifTag[][] EXIF_TAGS = new ExifTag[][] { 589 IFD_TIFF_TAGS, IFD_EXIF_TAGS, IFD_GPS_TAGS, IFD_INTEROPERABILITY_TAGS, 590 IFD_THUMBNAIL_TAGS 591 }; 592 // List of tags for pointing to the other image file directory offset. 593 private static final ExifTag[] IFD_POINTER_TAGS = new ExifTag[] { 594 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 595 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 596 new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965), 597 }; 598 // List of indices of the indicated tag groups according to the IFD_POINTER_TAGS 599 private static final int[] IFD_POINTER_TAG_HINTS = new int[] { 600 IFD_EXIF_HINT, IFD_GPS_HINT, IFD_INTEROPERABILITY_HINT 601 }; 602 // Tags for indicating the thumbnail offset and length 603 private static final ExifTag JPEG_INTERCHANGE_FORMAT_TAG = 604 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513); 605 private static final ExifTag JPEG_INTERCHANGE_FORMAT_LENGTH_TAG = 606 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514); 607 608 // Mappings from tag number to tag name and each item represents one IFD tag group. 609 private static final HashMap[] sExifTagMapsForReading = new HashMap[EXIF_TAGS.length]; 610 // Mappings from tag name to tag number and each item represents one IFD tag group. 611 private static final HashMap[] sExifTagMapsForWriting = new HashMap[EXIF_TAGS.length]; 612 613 // See JPEG File Interchange Format Version 1.02. 614 // The following values are defined for handling JPEG streams. In this implementation, we are 615 // not only getting information from EXIF but also from some JPEG special segments such as 616 // MARKER_COM for user comment and MARKER_SOFx for image width and height. 617 618 // Identifier for EXIF APP1 segment in JPEG 619 private static final byte[] IDENTIFIER_EXIF_APP1 = 620 "Exif\0\0".getBytes(Charset.forName("US-ASCII")); 621 // JPEG segment markers, that each marker consumes two bytes beginning with 0xff and ending with 622 // the indicator. There is no SOF4, SOF8, SOF16 markers in JPEG and SOFx markers indicates start 623 // of frame(baseline DCT) and the image size info exists in its beginning part. 624 private static final byte MARKER = (byte) 0xff; 625 private static final byte MARKER_SOI = (byte) 0xd8; 626 private static final byte MARKER_SOF0 = (byte) 0xc0; 627 private static final byte MARKER_SOF1 = (byte) 0xc1; 628 private static final byte MARKER_SOF2 = (byte) 0xc2; 629 private static final byte MARKER_SOF3 = (byte) 0xc3; 630 private static final byte MARKER_SOF5 = (byte) 0xc5; 631 private static final byte MARKER_SOF6 = (byte) 0xc6; 632 private static final byte MARKER_SOF7 = (byte) 0xc7; 633 private static final byte MARKER_SOF9 = (byte) 0xc9; 634 private static final byte MARKER_SOF10 = (byte) 0xca; 635 private static final byte MARKER_SOF11 = (byte) 0xcb; 636 private static final byte MARKER_SOF13 = (byte) 0xcd; 637 private static final byte MARKER_SOF14 = (byte) 0xce; 638 private static final byte MARKER_SOF15 = (byte) 0xcf; 639 private static final byte MARKER_SOS = (byte) 0xda; 640 private static final byte MARKER_APP1 = (byte) 0xe1; 641 private static final byte MARKER_COM = (byte) 0xfe; 642 private static final byte MARKER_EOI = (byte) 0xd9; 643 644 static { 645 System.loadLibrary("media_jni"); 646 nativeInitRaw(); 647 sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss"); 648 sFormatter.setTimeZone(TimeZone.getTimeZone("UTC")); 649 650 // Build up the hash tables to look up Exif tags for reading Exif tags. 651 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 652 sExifTagMapsForReading[hint] = new HashMap(); 653 sExifTagMapsForWriting[hint] = new HashMap(); 654 for (ExifTag tag : EXIF_TAGS[hint]) { 655 sExifTagMapsForReading[hint].put(tag.number, tag.name); 656 sExifTagMapsForWriting[hint].put(tag.name, tag.number); 657 } 658 } 659 } 660 661 private final String mFilename; 662 private final FileDescriptor mSeekableFileDescriptor; 663 private final AssetManager.AssetInputStream mAssetInputStream; 664 private final boolean mIsInputStream; 665 private boolean mIsRaw; 666 private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length]; 667 private boolean mHasThumbnail; 668 // The following values used for indicating a thumbnail position. 669 private int mThumbnailOffset; 670 private int mThumbnailLength; 671 private byte[] mThumbnailBytes; 672 673 // Pattern to check non zero timestamp 674 private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*"); 675 676 /** 677 * Reads Exif tags from the specified image file. 678 */ 679 public ExifInterface(String filename) throws IOException { 680 if (filename == null) { 681 throw new IllegalArgumentException("filename cannot be null"); 682 } 683 FileInputStream in = null; 684 mAssetInputStream = null; 685 mFilename = filename; 686 mIsInputStream = false; 687 try { 688 in = new FileInputStream(filename); 689 if (isSeekableFD(in.getFD())) { 690 mSeekableFileDescriptor = in.getFD(); 691 } else { 692 mSeekableFileDescriptor = null; 693 } 694 loadAttributes(in); 695 } finally { 696 IoUtils.closeQuietly(in); 697 } 698 } 699 700 /** 701 * Reads Exif tags from the specified image file descriptor. Attribute mutation is supported 702 * for writable and seekable file descriptors only. 703 */ 704 public ExifInterface(FileDescriptor fileDescriptor) throws IOException { 705 if (fileDescriptor == null) { 706 throw new IllegalArgumentException("parcelFileDescriptor cannot be null"); 707 } 708 mAssetInputStream = null; 709 mFilename = null; 710 if (isSeekableFD(fileDescriptor)) { 711 mSeekableFileDescriptor = fileDescriptor; 712 // Keep the original file descriptor in order to save attributes when it's seekable. 713 // Otherwise, just close the given file descriptor after reading it because the save 714 // feature won't be working. 715 try { 716 fileDescriptor = Os.dup(fileDescriptor); 717 } catch (ErrnoException e) { 718 e.rethrowAsIOException(); 719 } 720 } else { 721 mSeekableFileDescriptor = null; 722 } 723 mIsInputStream = false; 724 FileInputStream in = null; 725 try { 726 in = new FileInputStream(fileDescriptor); 727 loadAttributes(in); 728 } finally { 729 IoUtils.closeQuietly(in); 730 } 731 } 732 733 /** 734 * Reads Exif tags from the specified image input stream. Attribute mutation is not supported 735 * for input streams. 736 */ 737 public ExifInterface(InputStream inputStream) throws IOException { 738 if (inputStream == null) { 739 throw new IllegalArgumentException("inputStream cannot be null"); 740 } 741 mFilename = null; 742 if (inputStream instanceof AssetManager.AssetInputStream) { 743 mAssetInputStream = (AssetManager.AssetInputStream) inputStream; 744 mSeekableFileDescriptor = null; 745 } else if (inputStream instanceof FileInputStream 746 && isSeekableFD(((FileInputStream) inputStream).getFD())) { 747 mAssetInputStream = null; 748 mSeekableFileDescriptor = ((FileInputStream) inputStream).getFD(); 749 } else { 750 mAssetInputStream = null; 751 mSeekableFileDescriptor = null; 752 } 753 mIsInputStream = true; 754 loadAttributes(inputStream); 755 } 756 757 /** 758 * Returns the value of the specified tag or {@code null} if there 759 * is no such tag in the image file. 760 * 761 * @param tag the name of the tag. 762 */ 763 public String getAttribute(String tag) { 764 // Retrieves all tag groups. The value from primary image tag group has a higher priority 765 // than the value from the thumbnail tag group if there are more than one candidates. 766 for (int i = 0; i < EXIF_TAGS.length; ++i) { 767 Object value = mAttributes[i].get(tag); 768 if (value != null) { 769 return (String) value; 770 } 771 } 772 return null; 773 } 774 775 /** 776 * Returns the integer value of the specified tag. If there is no such tag 777 * in the image file or the value cannot be parsed as integer, return 778 * <var>defaultValue</var>. 779 * 780 * @param tag the name of the tag. 781 * @param defaultValue the value to return if the tag is not available. 782 */ 783 public int getAttributeInt(String tag, int defaultValue) { 784 String value = getAttribute(tag); 785 if (value == null) return defaultValue; 786 try { 787 return Integer.valueOf(value); 788 } catch (NumberFormatException e) { 789 return defaultValue; 790 } 791 } 792 793 /** 794 * Returns the double value of the tag that is specified as rational or contains a 795 * double-formatted value. If there is no such tag in the image file or the value cannot be 796 * parsed as double, return <var>defaultValue</var>. 797 * 798 * @param tag the name of the tag. 799 * @param defaultValue the value to return if the tag is not available. 800 */ 801 public double getAttributeDouble(String tag, double defaultValue) { 802 String value = getAttribute(tag); 803 if (value == null) return defaultValue; 804 try { 805 int index = value.indexOf("/"); 806 if (index == -1) return Double.parseDouble(value); 807 double denom = Double.parseDouble(value.substring(index + 1)); 808 if (denom == 0) return defaultValue; 809 double num = Double.parseDouble(value.substring(0, index)); 810 return num / denom; 811 } catch (NumberFormatException e) { 812 return defaultValue; 813 } 814 } 815 816 /** 817 * Set the value of the specified tag. 818 * 819 * @param tag the name of the tag. 820 * @param value the value of the tag. 821 */ 822 public void setAttribute(String tag, String value) { 823 for (int i = 0 ; i < EXIF_TAGS.length; ++i) { 824 if (sExifTagMapsForWriting[i].containsKey(tag)) { 825 mAttributes[i].put(tag, value); 826 } 827 } 828 } 829 830 /** 831 * This function decides which parser to read the image data according to the given input stream 832 * type and the content of the input stream. In each case, it reads the first three bytes to 833 * determine whether the image data format is JPEG or not. 834 */ 835 private void loadAttributes(@NonNull InputStream in) throws IOException { 836 try { 837 // Initialize mAttributes. 838 for (int i = 0; i < EXIF_TAGS.length; ++i) { 839 mAttributes[i] = new HashMap(); 840 } 841 842 // Process RAW input stream 843 if (mAssetInputStream != null) { 844 long asset = mAssetInputStream.getNativeAsset(); 845 if (handleRawResult(nativeGetRawAttributesFromAsset(asset))) { 846 return; 847 } 848 } else if (mSeekableFileDescriptor != null) { 849 if (handleRawResult(nativeGetRawAttributesFromFileDescriptor( 850 mSeekableFileDescriptor))) { 851 return; 852 } 853 } else { 854 in = new BufferedInputStream(in, JPEG_SIGNATURE_SIZE); 855 if (!isJpegInputStream((BufferedInputStream) in) && handleRawResult( 856 nativeGetRawAttributesFromInputStream(in))) { 857 return; 858 } 859 } 860 861 // Process JPEG input stream 862 getJpegAttributes(in); 863 } catch (IOException e) { 864 // Ignore exceptions in order to keep the compatibility with the old versions of 865 // ExifInterface. 866 Log.w(TAG, "Invalid JPEG: ExifInterface got an unsupported image format file" 867 + "(ExifInterface supports JPEG and some RAW image formats only) " 868 + "or a corrupted JPEG file to ExifInterface.", e); 869 } finally { 870 if (DEBUG) { 871 printAttributes(); 872 } 873 } 874 } 875 876 private static boolean isJpegInputStream(BufferedInputStream in) throws IOException { 877 in.mark(JPEG_SIGNATURE_SIZE); 878 byte[] signatureBytes = new byte[JPEG_SIGNATURE_SIZE]; 879 if (in.read(signatureBytes) != JPEG_SIGNATURE_SIZE) { 880 throw new EOFException(); 881 } 882 boolean isJpeg = Arrays.equals(JPEG_SIGNATURE, signatureBytes); 883 in.reset(); 884 return isJpeg; 885 } 886 887 private boolean handleRawResult(HashMap map) { 888 if (map == null) { 889 return false; 890 } 891 892 // Mark for disabling the save feature. 893 mIsRaw = true; 894 895 for (Map.Entry entry : (Set<Map.Entry>) map.entrySet()) { 896 String attrName = (String) entry.getKey(); 897 898 switch (attrName) { 899 case TAG_HAS_THUMBNAIL: 900 mHasThumbnail = ((String) entry.getValue()).equalsIgnoreCase("true"); 901 break; 902 case TAG_THUMBNAIL_OFFSET: 903 mThumbnailOffset = Integer.parseInt((String) entry.getValue()); 904 break; 905 case TAG_THUMBNAIL_LENGTH: 906 mThumbnailLength = Integer.parseInt((String) entry.getValue()); 907 break; 908 case TAG_THUMBNAIL_DATA: 909 mThumbnailBytes = (byte[]) entry.getValue(); 910 break; 911 default: 912 setAttribute(attrName, (String) entry.getValue()); 913 break; 914 } 915 } 916 return true; 917 } 918 919 private static boolean isSeekableFD(FileDescriptor fd) throws IOException { 920 try { 921 Os.lseek(fd, 0, OsConstants.SEEK_CUR); 922 return true; 923 } catch (ErrnoException e) { 924 return false; 925 } 926 } 927 928 // Prints out attributes for debugging. 929 private void printAttributes() { 930 for (int i = 0; i < mAttributes.length; ++i) { 931 Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size()); 932 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 933 Log.d(TAG, "tagName: " + entry.getKey() + ", tagValue: " + entry.getValue()); 934 } 935 } 936 } 937 938 /** 939 * Save the tag data into the original image file. This is expensive because it involves 940 * copying all the data from one file to another and deleting the old file and renaming the 941 * other. It's best to use{@link #setAttribute(String,String)} to set all attributes to write 942 * and make a single call rather than multiple calls for each attribute. 943 */ 944 public void saveAttributes() throws IOException { 945 if (mIsRaw) { 946 throw new UnsupportedOperationException( 947 "ExifInterface does not support saving attributes on RAW formats."); 948 } 949 if (mIsInputStream || (mSeekableFileDescriptor == null && mFilename == null)) { 950 throw new UnsupportedOperationException( 951 "ExifInterface does not support saving attributes for the current input."); 952 } 953 954 // Keep the thumbnail in memory 955 mThumbnailBytes = getThumbnail(); 956 957 FileInputStream in = null; 958 FileOutputStream out = null; 959 File tempFile = null; 960 try { 961 // Move the original file to temporary file. 962 if (mFilename != null) { 963 tempFile = new File(mFilename + ".tmp"); 964 File originalFile = new File(mFilename); 965 if (!originalFile.renameTo(tempFile)) { 966 throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath()); 967 } 968 } else if (mSeekableFileDescriptor != null) { 969 tempFile = File.createTempFile("temp", "jpg"); 970 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 971 in = new FileInputStream(mSeekableFileDescriptor); 972 out = new FileOutputStream(tempFile); 973 Streams.copy(in, out); 974 } 975 } catch (ErrnoException e) { 976 e.rethrowAsIOException(); 977 } finally { 978 IoUtils.closeQuietly(in); 979 IoUtils.closeQuietly(out); 980 } 981 982 in = null; 983 out = null; 984 try { 985 // Save the new file. 986 in = new FileInputStream(tempFile); 987 if (mFilename != null) { 988 out = new FileOutputStream(mFilename); 989 } else if (mSeekableFileDescriptor != null) { 990 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 991 out = new FileOutputStream(mSeekableFileDescriptor); 992 } 993 saveJpegAttributes(in, out); 994 } catch (ErrnoException e) { 995 e.rethrowAsIOException(); 996 } finally { 997 IoUtils.closeQuietly(in); 998 IoUtils.closeQuietly(out); 999 tempFile.delete(); 1000 } 1001 1002 // Discard the thumbnail in memory 1003 mThumbnailBytes = null; 1004 } 1005 1006 /** 1007 * Returns true if the image file has a thumbnail. 1008 */ 1009 public boolean hasThumbnail() { 1010 return mHasThumbnail; 1011 } 1012 1013 /** 1014 * Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail. 1015 * The returned data is in JPEG format and can be decoded using 1016 * {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)} 1017 */ 1018 public byte[] getThumbnail() { 1019 if (!mHasThumbnail) { 1020 return null; 1021 } 1022 if (mThumbnailBytes != null) { 1023 return mThumbnailBytes; 1024 } 1025 1026 // Read the thumbnail. 1027 FileInputStream in = null; 1028 try { 1029 if (mAssetInputStream != null) { 1030 return nativeGetThumbnailFromAsset( 1031 mAssetInputStream.getNativeAsset(), mThumbnailOffset, mThumbnailLength); 1032 } else if (mFilename != null) { 1033 in = new FileInputStream(mFilename); 1034 } else if (mSeekableFileDescriptor != null) { 1035 FileDescriptor fileDescriptor = Os.dup(mSeekableFileDescriptor); 1036 Os.lseek(fileDescriptor, 0, OsConstants.SEEK_SET); 1037 in = new FileInputStream(fileDescriptor); 1038 } 1039 if (in == null) { 1040 // Should not be reached this. 1041 throw new FileNotFoundException(); 1042 } 1043 if (in.skip(mThumbnailOffset) != mThumbnailOffset) { 1044 throw new IOException("Corrupted image"); 1045 } 1046 byte[] buffer = new byte[mThumbnailLength]; 1047 if (in.read(buffer) != mThumbnailLength) { 1048 throw new IOException("Corrupted image"); 1049 } 1050 return buffer; 1051 } catch (IOException | ErrnoException e) { 1052 // Couldn't get a thumbnail image. 1053 } finally { 1054 IoUtils.closeQuietly(in); 1055 } 1056 return null; 1057 } 1058 1059 /** 1060 * Returns the offset and length of thumbnail inside the image file, or 1061 * {@code null} if there is no thumbnail. 1062 * 1063 * @return two-element array, the offset in the first value, and length in 1064 * the second, or {@code null} if no thumbnail was found. 1065 * @hide 1066 */ 1067 public long[] getThumbnailRange() { 1068 long[] range = new long[2]; 1069 range[0] = mThumbnailOffset; 1070 range[1] = mThumbnailLength; 1071 return range; 1072 } 1073 1074 /** 1075 * Stores the latitude and longitude value in a float array. The first element is 1076 * the latitude, and the second element is the longitude. Returns false if the 1077 * Exif tags are not available. 1078 */ 1079 public boolean getLatLong(float output[]) { 1080 String latValue = getAttribute(TAG_GPS_LATITUDE); 1081 String latRef = getAttribute(TAG_GPS_LATITUDE_REF); 1082 String lngValue = getAttribute(TAG_GPS_LONGITUDE); 1083 String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF); 1084 1085 if (latValue != null && latRef != null && lngValue != null && lngRef != null) { 1086 try { 1087 output[0] = convertRationalLatLonToFloat(latValue, latRef); 1088 output[1] = convertRationalLatLonToFloat(lngValue, lngRef); 1089 return true; 1090 } catch (IllegalArgumentException e) { 1091 // if values are not parseable 1092 } 1093 } 1094 1095 return false; 1096 } 1097 1098 /** 1099 * Return the altitude in meters. If the exif tag does not exist, return 1100 * <var>defaultValue</var>. 1101 * 1102 * @param defaultValue the value to return if the tag is not available. 1103 */ 1104 public double getAltitude(double defaultValue) { 1105 double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1); 1106 int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1); 1107 1108 if (altitude >= 0 && ref >= 0) { 1109 return (altitude * ((ref == 1) ? -1 : 1)); 1110 } else { 1111 return defaultValue; 1112 } 1113 } 1114 1115 /** 1116 * Returns number of milliseconds since Jan. 1, 1970, midnight local time. 1117 * Returns -1 if the date time information if not available. 1118 * @hide 1119 */ 1120 public long getDateTime() { 1121 String dateTimeString = getAttribute(TAG_DATETIME); 1122 if (dateTimeString == null 1123 || !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1; 1124 1125 ParsePosition pos = new ParsePosition(0); 1126 try { 1127 // The exif field is in local time. Parsing it as if it is UTC will yield time 1128 // since 1/1/1970 local time 1129 Date datetime = sFormatter.parse(dateTimeString, pos); 1130 if (datetime == null) return -1; 1131 long msecs = datetime.getTime(); 1132 1133 String subSecs = getAttribute(TAG_SUBSECTIME); 1134 if (subSecs != null) { 1135 try { 1136 long sub = Long.valueOf(subSecs); 1137 while (sub > 1000) { 1138 sub /= 10; 1139 } 1140 msecs += sub; 1141 } catch (NumberFormatException e) { 1142 // Ignored 1143 } 1144 } 1145 return msecs; 1146 } catch (IllegalArgumentException e) { 1147 return -1; 1148 } 1149 } 1150 1151 /** 1152 * Returns number of milliseconds since Jan. 1, 1970, midnight UTC. 1153 * Returns -1 if the date time information if not available. 1154 * @hide 1155 */ 1156 public long getGpsDateTime() { 1157 String date = getAttribute(TAG_GPS_DATESTAMP); 1158 String time = getAttribute(TAG_GPS_TIMESTAMP); 1159 if (date == null || time == null 1160 || (!sNonZeroTimePattern.matcher(date).matches() 1161 && !sNonZeroTimePattern.matcher(time).matches())) { 1162 return -1; 1163 } 1164 1165 String dateTimeString = date + ' ' + time; 1166 1167 ParsePosition pos = new ParsePosition(0); 1168 try { 1169 Date datetime = sFormatter.parse(dateTimeString, pos); 1170 if (datetime == null) return -1; 1171 return datetime.getTime(); 1172 } catch (IllegalArgumentException e) { 1173 return -1; 1174 } 1175 } 1176 1177 private static float convertRationalLatLonToFloat(String rationalString, String ref) { 1178 try { 1179 String [] parts = rationalString.split(","); 1180 1181 String [] pair; 1182 pair = parts[0].split("/"); 1183 double degrees = Double.parseDouble(pair[0].trim()) 1184 / Double.parseDouble(pair[1].trim()); 1185 1186 pair = parts[1].split("/"); 1187 double minutes = Double.parseDouble(pair[0].trim()) 1188 / Double.parseDouble(pair[1].trim()); 1189 1190 pair = parts[2].split("/"); 1191 double seconds = Double.parseDouble(pair[0].trim()) 1192 / Double.parseDouble(pair[1].trim()); 1193 1194 double result = degrees + (minutes / 60.0) + (seconds / 3600.0); 1195 if ((ref.equals("S") || ref.equals("W"))) { 1196 return (float) -result; 1197 } 1198 return (float) result; 1199 } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) { 1200 // Not valid 1201 throw new IllegalArgumentException(); 1202 } 1203 } 1204 1205 // Loads EXIF attributes from a JPEG input stream. 1206 private void getJpegAttributes(InputStream inputStream) throws IOException { 1207 // See JPEG File Interchange Format Specification page 5. 1208 if (DEBUG) { 1209 Log.d(TAG, "getJpegAttributes starting with: " + inputStream); 1210 } 1211 DataInputStream dataInputStream = new DataInputStream(inputStream); 1212 byte marker; 1213 int bytesRead = 0; 1214 if ((marker = dataInputStream.readByte()) != MARKER) { 1215 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1216 } 1217 ++bytesRead; 1218 if (dataInputStream.readByte() != MARKER_SOI) { 1219 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1220 } 1221 ++bytesRead; 1222 while (true) { 1223 marker = dataInputStream.readByte(); 1224 if (marker != MARKER) { 1225 throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff)); 1226 } 1227 ++bytesRead; 1228 marker = dataInputStream.readByte(); 1229 if (DEBUG) { 1230 Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff)); 1231 } 1232 ++bytesRead; 1233 1234 // EOI indicates the end of an image and in case of SOS, JPEG image stream starts and 1235 // the image data will terminate right after. 1236 if (marker == MARKER_EOI || marker == MARKER_SOS) { 1237 break; 1238 } 1239 int length = dataInputStream.readUnsignedShort() - 2; 1240 bytesRead += 2; 1241 if (DEBUG) { 1242 Log.d(TAG, "JPEG segment: " + Integer.toHexString(marker & 0xff) + " (length: " 1243 + (length + 2) + ")"); 1244 } 1245 if (length < 0) { 1246 throw new IOException("Invalid length"); 1247 } 1248 switch (marker) { 1249 case MARKER_APP1: { 1250 if (DEBUG) { 1251 Log.d(TAG, "MARKER_APP1"); 1252 } 1253 if (length < 6) { 1254 // Skip if it's not an EXIF APP1 segment. 1255 break; 1256 } 1257 byte[] identifier = new byte[6]; 1258 if (inputStream.read(identifier) != 6) { 1259 throw new IOException("Invalid exif"); 1260 } 1261 bytesRead += 6; 1262 length -= 6; 1263 if (!Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1264 // Skip if it's not an EXIF APP1 segment. 1265 break; 1266 } 1267 if (length <= 0) { 1268 throw new IOException("Invalid exif"); 1269 } 1270 if (DEBUG) { 1271 Log.d(TAG, "readExifSegment with a byte array (length: " + length + ")"); 1272 } 1273 byte[] bytes = new byte[length]; 1274 if (dataInputStream.read(bytes) != length) { 1275 throw new IOException("Invalid exif"); 1276 } 1277 readExifSegment(bytes, bytesRead); 1278 bytesRead += length; 1279 length = 0; 1280 break; 1281 } 1282 1283 case MARKER_COM: { 1284 byte[] bytes = new byte[length]; 1285 if (dataInputStream.read(bytes) != length) { 1286 throw new IOException("Invalid exif"); 1287 } 1288 length = 0; 1289 setAttribute("UserComment", new String(bytes, Charset.forName("US-ASCII"))); 1290 break; 1291 } 1292 1293 case MARKER_SOF0: 1294 case MARKER_SOF1: 1295 case MARKER_SOF2: 1296 case MARKER_SOF3: 1297 case MARKER_SOF5: 1298 case MARKER_SOF6: 1299 case MARKER_SOF7: 1300 case MARKER_SOF9: 1301 case MARKER_SOF10: 1302 case MARKER_SOF11: 1303 case MARKER_SOF13: 1304 case MARKER_SOF14: 1305 case MARKER_SOF15: { 1306 if (dataInputStream.skipBytes(1) != 1) { 1307 throw new IOException("Invalid SOFx"); 1308 } 1309 setAttribute("ImageLength", 1310 String.valueOf(dataInputStream.readUnsignedShort())); 1311 setAttribute("ImageWidth", String.valueOf(dataInputStream.readUnsignedShort())); 1312 length -= 5; 1313 break; 1314 } 1315 1316 default: { 1317 break; 1318 } 1319 } 1320 if (length < 0) { 1321 throw new IOException("Invalid length"); 1322 } 1323 if (dataInputStream.skipBytes(length) != length) { 1324 throw new IOException("Invalid JPEG segment"); 1325 } 1326 bytesRead += length; 1327 } 1328 } 1329 1330 // Stores a new JPEG image with EXIF attributes into a given output stream. 1331 private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream) 1332 throws IOException { 1333 // See JPEG File Interchange Format Specification page 5. 1334 if (DEBUG) { 1335 Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream 1336 + ", outputStream: " + outputStream + ")"); 1337 } 1338 DataInputStream dataInputStream = new DataInputStream(inputStream); 1339 ExifDataOutputStream dataOutputStream = new ExifDataOutputStream(outputStream); 1340 if (dataInputStream.readByte() != MARKER) { 1341 throw new IOException("Invalid marker"); 1342 } 1343 dataOutputStream.writeByte(MARKER); 1344 if (dataInputStream.readByte() != MARKER_SOI) { 1345 throw new IOException("Invalid marker"); 1346 } 1347 dataOutputStream.writeByte(MARKER_SOI); 1348 1349 // Write EXIF APP1 segment 1350 dataOutputStream.writeByte(MARKER); 1351 dataOutputStream.writeByte(MARKER_APP1); 1352 writeExifSegment(dataOutputStream, 6); 1353 1354 byte[] bytes = new byte[4096]; 1355 1356 while (true) { 1357 byte marker = dataInputStream.readByte(); 1358 if (marker != MARKER) { 1359 throw new IOException("Invalid marker"); 1360 } 1361 marker = dataInputStream.readByte(); 1362 switch (marker) { 1363 case MARKER_APP1: { 1364 int length = dataInputStream.readUnsignedShort() - 2; 1365 if (length < 0) { 1366 throw new IOException("Invalid length"); 1367 } 1368 byte[] identifier = new byte[6]; 1369 if (length >= 6) { 1370 if (dataInputStream.read(identifier) != 6) { 1371 throw new IOException("Invalid exif"); 1372 } 1373 if (Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1374 // Skip the original EXIF APP1 segment. 1375 if (dataInputStream.skip(length - 6) != length - 6) { 1376 throw new IOException("Invalid length"); 1377 } 1378 break; 1379 } 1380 } 1381 // Copy non-EXIF APP1 segment. 1382 dataOutputStream.writeByte(MARKER); 1383 dataOutputStream.writeByte(marker); 1384 dataOutputStream.writeUnsignedShort(length + 2); 1385 if (length >= 6) { 1386 length -= 6; 1387 dataOutputStream.write(identifier); 1388 } 1389 int read; 1390 while (length > 0 && (read = dataInputStream.read( 1391 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1392 dataOutputStream.write(bytes, 0, read); 1393 length -= read; 1394 } 1395 break; 1396 } 1397 case MARKER_EOI: 1398 case MARKER_SOS: { 1399 dataOutputStream.writeByte(MARKER); 1400 dataOutputStream.writeByte(marker); 1401 // Copy all the remaining data 1402 Streams.copy(dataInputStream, dataOutputStream); 1403 return; 1404 } 1405 default: { 1406 // Copy JPEG segment 1407 dataOutputStream.writeByte(MARKER); 1408 dataOutputStream.writeByte(marker); 1409 int length = dataInputStream.readUnsignedShort(); 1410 dataOutputStream.writeUnsignedShort(length); 1411 length -= 2; 1412 if (length < 0) { 1413 throw new IOException("Invalid length"); 1414 } 1415 int read; 1416 while (length > 0 && (read = dataInputStream.read( 1417 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1418 dataOutputStream.write(bytes, 0, read); 1419 length -= read; 1420 } 1421 break; 1422 } 1423 } 1424 } 1425 } 1426 1427 // Reads the given EXIF byte area and save its tag data into attributes. 1428 private void readExifSegment(byte[] exifBytes, int exifOffsetFromBeginning) throws IOException { 1429 // Parse TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1430 ByteOrderAwarenessDataInputStream dataInputStream = 1431 new ByteOrderAwarenessDataInputStream(exifBytes); 1432 1433 // Read byte align 1434 short byteOrder = dataInputStream.readShort(); 1435 switch (byteOrder) { 1436 case BYTE_ALIGN_II: 1437 if (DEBUG) { 1438 Log.d(TAG, "readExifSegment: Byte Align II"); 1439 } 1440 dataInputStream.setByteOrder(ByteOrder.LITTLE_ENDIAN); 1441 break; 1442 case BYTE_ALIGN_MM: 1443 if (DEBUG) { 1444 Log.d(TAG, "readExifSegment: Byte Align MM"); 1445 } 1446 dataInputStream.setByteOrder(ByteOrder.BIG_ENDIAN); 1447 break; 1448 default: 1449 throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder)); 1450 } 1451 1452 int startCode = dataInputStream.readUnsignedShort(); 1453 if (startCode != 0x2a) { 1454 throw new IOException("Invalid exif start: " + Integer.toHexString(startCode)); 1455 } 1456 1457 // Read first ifd offset 1458 long firstIfdOffset = dataInputStream.readUnsignedInt(); 1459 if (firstIfdOffset < 8 || firstIfdOffset >= exifBytes.length) { 1460 throw new IOException("Invalid first Ifd offset: " + firstIfdOffset); 1461 } 1462 firstIfdOffset -= 8; 1463 if (firstIfdOffset > 0) { 1464 if (dataInputStream.skip(firstIfdOffset) != firstIfdOffset) { 1465 throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset); 1466 } 1467 } 1468 1469 // Read primary image TIFF image file directory. 1470 readImageFileDirectory(dataInputStream, IFD_TIFF_HINT); 1471 1472 // Process thumbnail. 1473 String jpegInterchangeFormatString = getAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name); 1474 String jpegInterchangeFormatLengthString = 1475 getAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name); 1476 if (jpegInterchangeFormatString != null && jpegInterchangeFormatLengthString != null) { 1477 try { 1478 int jpegInterchangeFormat = Integer.parseInt(jpegInterchangeFormatString); 1479 int jpegInterchangeFormatLength = Integer 1480 .parseInt(jpegInterchangeFormatLengthString); 1481 // The following code limits the size of thumbnail size not to overflow EXIF data area. 1482 jpegInterchangeFormatLength = Math.min(jpegInterchangeFormat 1483 + jpegInterchangeFormatLength, exifOffsetFromBeginning + exifBytes.length) 1484 - jpegInterchangeFormat; 1485 if (jpegInterchangeFormat > 0 && jpegInterchangeFormatLength > 0) { 1486 mHasThumbnail = true; 1487 mThumbnailOffset = exifOffsetFromBeginning + jpegInterchangeFormat; 1488 mThumbnailLength = jpegInterchangeFormatLength; 1489 1490 if (mFilename == null && mAssetInputStream == null 1491 && mSeekableFileDescriptor == null) { 1492 // Save the thumbnail in memory if the input doesn't support reading again. 1493 byte[] thumbnailBytes = new byte[jpegInterchangeFormatLength]; 1494 dataInputStream.seek(jpegInterchangeFormat); 1495 dataInputStream.readFully(thumbnailBytes); 1496 mThumbnailBytes = thumbnailBytes; 1497 1498 if (DEBUG) { 1499 Bitmap bitmap = BitmapFactory.decodeByteArray( 1500 thumbnailBytes, 0, thumbnailBytes.length); 1501 Log.d(TAG, "Thumbnail offset: " + mThumbnailOffset + ", length: " 1502 + mThumbnailLength + ", width: " + bitmap.getWidth() 1503 + ", height: " 1504 + bitmap.getHeight()); 1505 } 1506 } 1507 } 1508 } catch (NumberFormatException e) { 1509 // Ignored the corrupted image. 1510 } 1511 } 1512 1513 // For compatibility, keep data formats as follows. 1514 convertToInt(TAG_IMAGE_WIDTH); 1515 convertToInt(TAG_IMAGE_LENGTH); 1516 convertToInt(TAG_ORIENTATION); 1517 convertToInt(TAG_FLASH); 1518 convertToRational(TAG_FOCAL_LENGTH); 1519 convertToDouble(TAG_DIGITAL_ZOOM_RATIO); 1520 convertToDouble(TAG_EXPOSURE_TIME); 1521 convertToDouble(TAG_F_NUMBER); 1522 convertToDouble(TAG_SUBJECT_DISTANCE); 1523 convertToInt(TAG_ISO); 1524 convertToDouble(TAG_EXPOSURE_BIAS_VALUE); 1525 convertToInt(TAG_WHITE_BALANCE); 1526 convertToInt(TAG_LIGHT_SOURCE); 1527 convertToInt(TAG_METERING_MODE); 1528 convertToInt(TAG_EXPOSURE_PROGRAM); 1529 convertToInt(TAG_EXPOSURE_MODE); 1530 convertToRational(TAG_GPS_ALTITUDE); 1531 convertToInt(TAG_GPS_ALTITUDE_REF); 1532 convertToRational(TAG_GPS_LONGITUDE); 1533 convertToRational(TAG_GPS_LATITUDE); 1534 convertToTimetamp(TAG_GPS_TIMESTAMP); 1535 1536 // The value of DATETIME tag has the same value of DATETIME_ORIGINAL tag. 1537 String valueOfDateTimeOriginal = getAttribute("DateTimeOriginal"); 1538 if (valueOfDateTimeOriginal != null) { 1539 setAttribute(TAG_DATETIME, valueOfDateTimeOriginal); 1540 } 1541 1542 // Add the default value. 1543 if (getAttribute(TAG_IMAGE_WIDTH) == null) { 1544 setAttribute(TAG_IMAGE_WIDTH, "0"); 1545 } 1546 if (getAttribute(TAG_IMAGE_LENGTH) == null) { 1547 setAttribute(TAG_IMAGE_LENGTH, "0"); 1548 } 1549 if (getAttribute(TAG_ORIENTATION) == null) { 1550 setAttribute(TAG_ORIENTATION, "0"); 1551 } 1552 if (getAttribute(TAG_LIGHT_SOURCE) == null) { 1553 setAttribute(TAG_LIGHT_SOURCE, "0"); 1554 } 1555 } 1556 1557 // Converts the tag value to timestamp; Otherwise deletes the given tag. 1558 private void convertToTimetamp(String tagName) { 1559 String entryValue = getAttribute(tagName); 1560 if (entryValue == null) return; 1561 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1562 String[] components = entryValue.split(","); 1563 if (dataFormat == IFD_FORMAT_SRATIONAL && components.length == 3) { 1564 StringBuilder stringBuilder = new StringBuilder(); 1565 for (String component : components) { 1566 if (stringBuilder.length() > 0) { 1567 stringBuilder.append(":"); 1568 } 1569 String[] rationalNumber = component.split("/"); 1570 int numerator = Integer.parseInt(rationalNumber[0]); 1571 int denominator = Integer.parseInt(rationalNumber[1]); 1572 if (denominator == 0) { 1573 numerator = 0; 1574 denominator = 1; 1575 } 1576 int value = numerator / denominator; 1577 stringBuilder.append(String.format("%02d", value)); 1578 } 1579 setAttribute(tagName, stringBuilder.toString()); 1580 } else if (dataFormat != IFD_FORMAT_STRING) { 1581 setAttribute(tagName, null); 1582 } 1583 } 1584 1585 // Checks the tag value of a given tag formatted in double type; Otherwise try to convert it to 1586 // double type or delete it. 1587 private void convertToDouble(String tagName) { 1588 String entryValue = getAttribute(tagName); 1589 if (entryValue == null) return; 1590 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1591 switch (dataFormat) { 1592 case IFD_FORMAT_SRATIONAL: { 1593 StringBuilder stringBuilder = new StringBuilder(); 1594 String[] components = entryValue.split(","); 1595 for (String component : components) { 1596 if (stringBuilder.length() > 0) { 1597 stringBuilder.append(","); 1598 } 1599 String[] rationalNumber = component.split("/"); 1600 int numerator = Integer.parseInt(rationalNumber[0]); 1601 int denominator = Integer.parseInt(rationalNumber[1]); 1602 if (denominator == 0) { 1603 numerator = 0; 1604 denominator = 1; 1605 } 1606 stringBuilder.append((double) numerator / denominator); 1607 } 1608 setAttribute(tagName, stringBuilder.toString()); 1609 break; 1610 } 1611 case IFD_FORMAT_DOUBLE: 1612 // Keep it as is. 1613 break; 1614 default: 1615 setAttribute(tagName, null); 1616 break; 1617 } 1618 } 1619 1620 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1621 private void convertToRational(String tagName) { 1622 String entryValue = getAttribute(tagName); 1623 if (entryValue == null) return; 1624 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1625 switch (dataFormat) { 1626 case IFD_FORMAT_SLONG: 1627 case IFD_FORMAT_DOUBLE: { 1628 StringBuilder stringBuilder = new StringBuilder(); 1629 String[] components = entryValue.split(","); 1630 for (String component : components) { 1631 if (stringBuilder.length() > 0) { 1632 stringBuilder.append(","); 1633 } 1634 double doubleValue = Double.parseDouble(component); 1635 stringBuilder.append((int) (doubleValue * 10000.0)).append("/").append(10000); 1636 } 1637 setAttribute(tagName, stringBuilder.toString()); 1638 break; 1639 } 1640 case IFD_FORMAT_SRATIONAL: 1641 // Keep it as is. 1642 break; 1643 default: 1644 setAttribute(tagName, null); 1645 break; 1646 } 1647 } 1648 1649 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1650 private void convertToInt(String tagName) { 1651 String entryValue = getAttribute(tagName); 1652 if (entryValue == null) return; 1653 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1654 if (dataFormat != IFD_FORMAT_SLONG) { 1655 setAttribute(tagName, null); 1656 } 1657 } 1658 1659 // Reads image file directory, which is a tag group in EXIF. 1660 private void readImageFileDirectory(ByteOrderAwarenessDataInputStream dataInputStream, int hint) 1661 throws IOException { 1662 if (dataInputStream.peek() + 2 > dataInputStream.mLength) { 1663 // Return if there is no data from the offset. 1664 return; 1665 } 1666 // See JEITA CP-3451 Figure 5. page 9. 1667 short numberOfDirectoryEntry = dataInputStream.readShort(); 1668 if (dataInputStream.peek() + 12 * numberOfDirectoryEntry > dataInputStream.mLength) { 1669 // Return if the size of entries is too big. 1670 return; 1671 } 1672 1673 if (DEBUG) { 1674 Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry); 1675 } 1676 1677 for (short i = 0; i < numberOfDirectoryEntry; ++i) { 1678 int tagNumber = dataInputStream.readUnsignedShort(); 1679 int dataFormat = dataInputStream.readUnsignedShort(); 1680 int numberOfComponents = dataInputStream.readInt(); 1681 long nextEntryOffset = dataInputStream.peek() + 4; // next four bytes is for data 1682 // offset or value. 1683 // Look up a corresponding tag from tag number 1684 String tagName = (String) sExifTagMapsForReading[hint].get(tagNumber); 1685 1686 if (DEBUG) { 1687 Log.d(TAG, String.format("hint: %d, tagNumber: %d, tagName: %s, dataFormat: %d, " + 1688 "numberOfComponents: %d", hint, tagNumber, tagName, dataFormat, 1689 numberOfComponents)); 1690 } 1691 1692 if (tagName == null || dataFormat <= 0 || 1693 dataFormat >= IFD_FORMAT_BYTES_PER_FORMAT.length) { 1694 // Skip if the parsed tag number is not defined or invalid data format. 1695 if (tagName == null) { 1696 Log.w(TAG, "Skip the tag entry since tag number is not defined: " + tagNumber); 1697 } else { 1698 Log.w(TAG, "Skip the tag entry since data format is invalid: " + dataFormat); 1699 } 1700 dataInputStream.seek(nextEntryOffset); 1701 continue; 1702 } 1703 1704 // Read a value from data field or seek to the value offset which is stored in data 1705 // field if the size of the entry value is bigger than 4. 1706 int byteCount = numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat]; 1707 if (byteCount > 4) { 1708 long offset = dataInputStream.readUnsignedInt(); 1709 if (DEBUG) { 1710 Log.d(TAG, "seek to data offset: " + offset); 1711 } 1712 if (offset + byteCount <= dataInputStream.mLength) { 1713 dataInputStream.seek(offset); 1714 } else { 1715 // Skip if invalid data offset. 1716 Log.w(TAG, "Skip the tag entry since data offset is invalid: " + offset); 1717 dataInputStream.seek(nextEntryOffset); 1718 continue; 1719 } 1720 } 1721 1722 // Recursively parse IFD when a IFD pointer tag appears. 1723 int innerIfdHint = getIfdHintFromTagNumber(tagNumber); 1724 if (DEBUG) { 1725 Log.d(TAG, "innerIfdHint: " + innerIfdHint + " byteCount: " + byteCount); 1726 } 1727 if (innerIfdHint >= 0) { 1728 long offset = -1L; 1729 // Get offset from data field 1730 switch (dataFormat) { 1731 case IFD_FORMAT_USHORT: { 1732 offset = dataInputStream.readUnsignedShort(); 1733 break; 1734 } 1735 case IFD_FORMAT_SSHORT: { 1736 offset = dataInputStream.readShort(); 1737 break; 1738 } 1739 case IFD_FORMAT_ULONG: { 1740 offset = dataInputStream.readUnsignedInt(); 1741 break; 1742 } 1743 case IFD_FORMAT_SLONG: { 1744 offset = dataInputStream.readInt(); 1745 break; 1746 } 1747 default: { 1748 // Nothing to do 1749 break; 1750 } 1751 } 1752 if (DEBUG) { 1753 Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tagName)); 1754 } 1755 if (offset > 0L && offset < dataInputStream.mLength) { 1756 dataInputStream.seek(offset); 1757 readImageFileDirectory(dataInputStream, innerIfdHint); 1758 } else { 1759 Log.w(TAG, "Skip jump into the IFD since its offset is invalid: " + offset); 1760 } 1761 1762 dataInputStream.seek(nextEntryOffset); 1763 continue; 1764 } 1765 1766 if (numberOfComponents == 1 || dataFormat == IFD_FORMAT_STRING 1767 || dataFormat == IFD_FORMAT_UNDEFINED) { 1768 String entryValue = readExifEntryValue( 1769 dataInputStream, dataFormat, numberOfComponents); 1770 if (entryValue != null) { 1771 setAttribute(tagName, entryValue); 1772 } 1773 } else { 1774 StringBuilder entryValueBuilder = new StringBuilder(); 1775 for (int c = 0; c < numberOfComponents; ++c) { 1776 if (entryValueBuilder.length() > 0) { 1777 entryValueBuilder.append(","); 1778 } 1779 entryValueBuilder.append(readExifEntryValue( 1780 dataInputStream, dataFormat, numberOfComponents)); 1781 } 1782 setAttribute(tagName, entryValueBuilder.toString()); 1783 } 1784 1785 if (dataInputStream.peek() != nextEntryOffset) { 1786 dataInputStream.seek(nextEntryOffset); 1787 } 1788 } 1789 1790 if (dataInputStream.peek() + 4 <= dataInputStream.mLength) { 1791 long nextIfdOffset = dataInputStream.readUnsignedInt(); 1792 if (DEBUG) { 1793 Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset)); 1794 } 1795 // The next IFD offset needs to be bigger than 8 1796 // since the first IFD offset is at least 8. 1797 if (nextIfdOffset > 8 && nextIfdOffset < dataInputStream.mLength) { 1798 dataInputStream.seek(nextIfdOffset); 1799 readImageFileDirectory(dataInputStream, IFD_THUMBNAIL_HINT); 1800 } 1801 } 1802 } 1803 1804 // Reads a value from where the entry value are stored. 1805 private String readExifEntryValue(ByteOrderAwarenessDataInputStream dataInputStream, 1806 int dataFormat, int numberOfComponents) throws IOException { 1807 // See TIFF 6.0 spec Types. page 15. 1808 switch (dataFormat) { 1809 case IFD_FORMAT_BYTE: { 1810 return String.valueOf(dataInputStream.readByte()); 1811 } 1812 case IFD_FORMAT_SBYTE: { 1813 return String.valueOf(dataInputStream.readByte() & 0xff); 1814 } 1815 case IFD_FORMAT_USHORT: { 1816 return String.valueOf(dataInputStream.readUnsignedShort()); 1817 } 1818 case IFD_FORMAT_SSHORT: { 1819 return String.valueOf(dataInputStream.readUnsignedInt()); 1820 } 1821 case IFD_FORMAT_ULONG: { 1822 return String.valueOf(dataInputStream.readInt()); 1823 } 1824 case IFD_FORMAT_SLONG: { 1825 return String.valueOf(dataInputStream.readInt()); 1826 } 1827 case IFD_FORMAT_URATIONAL: 1828 case IFD_FORMAT_SRATIONAL: { 1829 int numerator = dataInputStream.readInt(); 1830 int denominator = dataInputStream.readInt(); 1831 return numerator + "/" + denominator; 1832 } 1833 case IFD_FORMAT_SINGLE: { 1834 return String.valueOf(dataInputStream.readFloat()); 1835 } 1836 case IFD_FORMAT_DOUBLE: { 1837 return String.valueOf(dataInputStream.readDouble()); 1838 } 1839 case IFD_FORMAT_UNDEFINED: // Usually UNDEFINED format is ASCII. 1840 case IFD_FORMAT_STRING: { 1841 byte[] bytes = new byte[numberOfComponents]; 1842 dataInputStream.readFully(bytes); 1843 int index = 0; 1844 if (numberOfComponents >= EXIF_ASCII_PREFIX.length) { 1845 boolean same = true; 1846 for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) { 1847 if (bytes[i] != EXIF_ASCII_PREFIX[i]) { 1848 same = false; 1849 break; 1850 } 1851 } 1852 if (same) { 1853 index = EXIF_ASCII_PREFIX.length; 1854 } 1855 } 1856 1857 StringBuilder stringBuilder = new StringBuilder(); 1858 while (index < numberOfComponents) { 1859 int ch = bytes[index]; 1860 if (ch == 0) { 1861 break; 1862 } 1863 if (ch >= 32) { 1864 stringBuilder.append((char) ch); 1865 } 1866 else { 1867 stringBuilder.append('?'); 1868 } 1869 ++index; 1870 } 1871 return stringBuilder.toString(); 1872 } 1873 default: { 1874 // Nothing to do 1875 return null; 1876 } 1877 } 1878 } 1879 1880 // Gets the corresponding IFD group index of the given tag number for writing Exif Tags. 1881 private static int getIfdHintFromTagNumber(int tagNumber) { 1882 for (int i = 0; i < IFD_POINTER_TAG_HINTS.length; ++i) { 1883 if (IFD_POINTER_TAGS[i].number == tagNumber) { 1884 return IFD_POINTER_TAG_HINTS[i]; 1885 } 1886 } 1887 return -1; 1888 } 1889 1890 // Writes an Exif segment into the given output stream. 1891 private int writeExifSegment(ExifDataOutputStream dataOutputStream, int exifOffsetFromBeginning) 1892 throws IOException { 1893 // The following variables are for calculating each IFD tag group size in bytes. 1894 int[] ifdOffsets = new int[EXIF_TAGS.length]; 1895 int[] ifdDataSizes = new int[EXIF_TAGS.length]; 1896 1897 // Remove IFD pointer tags (we'll re-add it later.) 1898 for (ExifTag tag : IFD_POINTER_TAGS) { 1899 setAttribute(tag.name, null); 1900 } 1901 // Remove old thumbnail data 1902 setAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name, null); 1903 setAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, null); 1904 1905 // Remove null value tags. 1906 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1907 for (Object obj : mAttributes[hint].entrySet().toArray()) { 1908 Map.Entry entry = (Map.Entry) obj; 1909 if (entry.getValue() == null) { 1910 mAttributes[hint].remove(entry.getKey()); 1911 } 1912 } 1913 } 1914 1915 // Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD 1916 // offset when there is one or more tags in the thumbnail IFD. 1917 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1918 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, "0"); 1919 } 1920 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1921 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, "0"); 1922 } 1923 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1924 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, "0"); 1925 } 1926 if (mHasThumbnail) { 1927 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, "0"); 1928 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1929 String.valueOf(mThumbnailLength)); 1930 } 1931 1932 // Calculate IFD group data area sizes. IFD group data area is assigned to save the entry 1933 // value which has a bigger size than 4 bytes. 1934 for (int i = 0; i < 5; ++i) { 1935 int sum = 0; 1936 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 1937 String entryValue = (String) ((Map.Entry) entry).getValue(); 1938 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1939 int size = getSizeOfExifEntryValue(dataFormat, entryValue); 1940 if (size > 4) { 1941 sum += size; 1942 } 1943 } 1944 ifdDataSizes[i] += sum; 1945 } 1946 1947 // Calculate IFD offsets. 1948 int position = 8; 1949 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1950 if (!mAttributes[hint].isEmpty()) { 1951 ifdOffsets[hint] = position; 1952 position += 2 + mAttributes[hint].size() * 12 + 4 + ifdDataSizes[hint]; 1953 } 1954 } 1955 if (mHasThumbnail) { 1956 int thumbnailOffset = position; 1957 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, 1958 String.valueOf(thumbnailOffset)); 1959 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1960 String.valueOf(mThumbnailLength)); 1961 mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset; 1962 position += mThumbnailLength; 1963 } 1964 1965 // Calculate the total size 1966 int totalSize = position + 8; // eight bytes is for header part. 1967 if (DEBUG) { 1968 Log.d(TAG, "totalSize length: " + totalSize); 1969 for (int i = 0; i < 5; ++i) { 1970 Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d", 1971 i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i])); 1972 } 1973 } 1974 1975 // Update IFD pointer tags with the calculated offsets. 1976 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1977 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, 1978 String.valueOf(ifdOffsets[IFD_EXIF_HINT])); 1979 } 1980 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1981 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, 1982 String.valueOf(ifdOffsets[IFD_GPS_HINT])); 1983 } 1984 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1985 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, 1986 String.valueOf(ifdOffsets[IFD_INTEROPERABILITY_HINT])); 1987 } 1988 1989 // Write TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1990 dataOutputStream.writeUnsignedShort(totalSize); 1991 dataOutputStream.write(IDENTIFIER_EXIF_APP1); 1992 dataOutputStream.writeShort(BYTE_ALIGN_MM); 1993 dataOutputStream.writeUnsignedShort(0x2a); 1994 dataOutputStream.writeUnsignedInt(8); 1995 1996 // Write IFD groups. See JEITA CP-3451C Figure 7. page 12. 1997 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1998 if (!mAttributes[hint].isEmpty()) { 1999 // See JEITA CP-3451C 4.6.2 IFD structure. page 13. 2000 // Write entry count 2001 dataOutputStream.writeUnsignedShort(mAttributes[hint].size()); 2002 2003 // Write entry info 2004 int dataOffset = ifdOffsets[hint] + 2 + mAttributes[hint].size() * 12 + 4; 2005 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 2006 // Convert tag name to tag number. 2007 int tagNumber = (int) sExifTagMapsForWriting[hint].get(entry.getKey()); 2008 String entryValue = (String) entry.getValue(); 2009 2010 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2011 int numberOfComponents = getNumberOfComponentsInExifEntryValue(dataFormat, 2012 entryValue); 2013 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 2014 2015 dataOutputStream.writeUnsignedShort(tagNumber); 2016 dataOutputStream.writeUnsignedShort(dataFormat); 2017 dataOutputStream.writeInt(numberOfComponents); 2018 if (byteCount > 4) { 2019 dataOutputStream.writeUnsignedInt(dataOffset); 2020 dataOffset += byteCount; 2021 } else { 2022 int bytesWritten = writeExifEntryValue(dataOutputStream, entryValue); 2023 // Fill zero up to 4 bytes 2024 if (bytesWritten < 4) { 2025 for (int i = bytesWritten; i < 4; ++i) { 2026 dataOutputStream.write(0); 2027 } 2028 } 2029 } 2030 } 2031 2032 // Write the next offset. It writes the offset of thumbnail IFD if there is one or 2033 // more tags in the thumbnail IFD when the current IFD is the primary image TIFF 2034 // IFD; Otherwise 0. 2035 if (hint == 0 && !mAttributes[IFD_THUMBNAIL_HINT].isEmpty()) { 2036 dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_THUMBNAIL_HINT]); 2037 } else { 2038 dataOutputStream.writeUnsignedInt(0); 2039 } 2040 2041 // Write values of data field exceeding 4 bytes after the next offset. 2042 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 2043 String entryValue = (String) entry.getValue(); 2044 2045 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2046 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 2047 if (byteCount > 4) { 2048 writeExifEntryValue(dataOutputStream, entryValue); 2049 } 2050 } 2051 } 2052 } 2053 2054 // Write thumbnail 2055 if (mHasThumbnail) { 2056 dataOutputStream.write(getThumbnail()); 2057 } 2058 2059 return totalSize; 2060 } 2061 2062 // Writes EXIF entry value and its entry value type will be automatically determined. 2063 private static int writeExifEntryValue(ExifDataOutputStream dataOutputStream, String entryValue) 2064 throws IOException { 2065 int bytesWritten = 0; 2066 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2067 2068 if (dataFormat == IFD_FORMAT_STRING) { 2069 byte[] asciiArray = (entryValue + '\0').getBytes(Charset.forName("US-ASCII")); 2070 dataOutputStream.write(asciiArray); 2071 return asciiArray.length; 2072 } 2073 2074 // Values can be composed of several components. Each component is separated by char ','. 2075 String[] components = entryValue.split(","); 2076 for (String component : components) { 2077 switch (dataFormat) { 2078 case IFD_FORMAT_SLONG: 2079 dataOutputStream.writeInt(Integer.parseInt(component)); 2080 bytesWritten += 4; 2081 break; 2082 case IFD_FORMAT_DOUBLE: 2083 dataOutputStream.writeDouble(Double.parseDouble(component)); 2084 bytesWritten += 8; 2085 break; 2086 case IFD_FORMAT_SRATIONAL: 2087 String[] rationalNumber = component.split("/"); 2088 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[0])); 2089 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[1])); 2090 bytesWritten += 8; 2091 break; 2092 default: 2093 throw new IllegalArgumentException(); 2094 } 2095 } 2096 return bytesWritten; 2097 } 2098 2099 // Determines the data format of EXIF entry value. 2100 private static int getDataFormatOfExifEntryValue(String entryValue) { 2101 // See TIFF 6.0 spec Types. page 15. 2102 // Take the first component if there are more than one component. 2103 if (entryValue.contains(",")) { 2104 String[] entryValues = entryValue.split(","); 2105 int dataFormat = getDataFormatOfExifEntryValue(entryValues[0]); 2106 if (dataFormat == IFD_FORMAT_STRING) { 2107 return IFD_FORMAT_STRING; 2108 } 2109 for (int i = 1; i < entryValues.length; ++i) { 2110 if (getDataFormatOfExifEntryValue(entryValues[i]) != dataFormat) { 2111 return IFD_FORMAT_STRING; 2112 } 2113 } 2114 return dataFormat; 2115 } 2116 2117 if (entryValue.contains("/")) { 2118 String[] rationalNumber = entryValue.split("/"); 2119 if (rationalNumber.length == 2) { 2120 try { 2121 Integer.parseInt(rationalNumber[0]); 2122 Integer.parseInt(rationalNumber[1]); 2123 return IFD_FORMAT_SRATIONAL; 2124 } catch (NumberFormatException e) { 2125 // Ignored 2126 } 2127 } 2128 return IFD_FORMAT_STRING; 2129 } 2130 try { 2131 Integer.parseInt(entryValue); 2132 return IFD_FORMAT_SLONG; 2133 } catch (NumberFormatException e) { 2134 // Ignored 2135 } 2136 try { 2137 Double.parseDouble(entryValue); 2138 return IFD_FORMAT_DOUBLE; 2139 } catch (NumberFormatException e) { 2140 // Ignored 2141 } 2142 return IFD_FORMAT_STRING; 2143 } 2144 2145 // Determines the size of EXIF entry value. 2146 private static int getSizeOfExifEntryValue(int dataFormat, String entryValue) { 2147 // See TIFF 6.0 spec Types page 15. 2148 if (dataFormat == IFD_FORMAT_STRING) { 2149 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2150 } 2151 int bytesEstimated = 0; 2152 String[] components = entryValue.split(","); 2153 for (String component : components) { 2154 switch (dataFormat) { 2155 case IFD_FORMAT_SLONG: 2156 bytesEstimated += 4; 2157 break; 2158 case IFD_FORMAT_DOUBLE: 2159 bytesEstimated += 8; 2160 break; 2161 case IFD_FORMAT_SRATIONAL: 2162 bytesEstimated += 8; 2163 break; 2164 default: 2165 throw new IllegalArgumentException(); 2166 } 2167 } 2168 return bytesEstimated; 2169 } 2170 2171 // Determines the number of components of EXIF entry value. 2172 private static int getNumberOfComponentsInExifEntryValue(int dataFormat, String entryValue) { 2173 if (dataFormat == IFD_FORMAT_STRING) { 2174 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2175 } 2176 int count = 1; 2177 for (int i = 0; i < entryValue.length(); ++i) { 2178 if (entryValue.charAt(i) == ',') { 2179 ++count; 2180 } 2181 } 2182 return count; 2183 } 2184 2185 // An input stream to parse EXIF data area, which can be written in either little or big endian 2186 // order. 2187 private static class ByteOrderAwarenessDataInputStream extends ByteArrayInputStream { 2188 private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN; 2189 private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN; 2190 2191 private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN; 2192 private final long mLength; 2193 private long mPosition; 2194 2195 public ByteOrderAwarenessDataInputStream(byte[] bytes) { 2196 super(bytes); 2197 mLength = bytes.length; 2198 mPosition = 0L; 2199 } 2200 2201 public void setByteOrder(ByteOrder byteOrder) { 2202 mByteOrder = byteOrder; 2203 } 2204 2205 public void seek(long byteCount) throws IOException { 2206 mPosition = 0L; 2207 reset(); 2208 if (skip(byteCount) != byteCount) { 2209 throw new IOException("Couldn't seek up to the byteCount"); 2210 } 2211 } 2212 2213 public long peek() { 2214 return mPosition; 2215 } 2216 2217 public void readFully(byte[] buffer) throws IOException { 2218 mPosition += buffer.length; 2219 if (mPosition > mLength) { 2220 throw new EOFException(); 2221 } 2222 if (super.read(buffer, 0, buffer.length) != buffer.length) { 2223 throw new IOException("Couldn't read up to the length of buffer"); 2224 } 2225 } 2226 2227 public byte readByte() throws IOException { 2228 ++mPosition; 2229 if (mPosition > mLength) { 2230 throw new EOFException(); 2231 } 2232 int ch = super.read(); 2233 if (ch < 0) { 2234 throw new EOFException(); 2235 } 2236 return (byte) ch; 2237 } 2238 2239 public short readShort() throws IOException { 2240 mPosition += 2; 2241 if (mPosition > mLength) { 2242 throw new EOFException(); 2243 } 2244 int ch1 = super.read(); 2245 int ch2 = super.read(); 2246 if ((ch1 | ch2) < 0) { 2247 throw new EOFException(); 2248 } 2249 if (mByteOrder == LITTLE_ENDIAN) { 2250 return (short) ((ch2 << 8) + (ch1)); 2251 } else if (mByteOrder == BIG_ENDIAN) { 2252 return (short) ((ch1 << 8) + (ch2)); 2253 } 2254 throw new IOException("Invalid byte order: " + mByteOrder); 2255 } 2256 2257 public int readInt() throws IOException { 2258 mPosition += 4; 2259 if (mPosition > mLength) { 2260 throw new EOFException(); 2261 } 2262 int ch1 = super.read(); 2263 int ch2 = super.read(); 2264 int ch3 = super.read(); 2265 int ch4 = super.read(); 2266 if ((ch1 | ch2 | ch3 | ch4) < 0) { 2267 throw new EOFException(); 2268 } 2269 if (mByteOrder == LITTLE_ENDIAN) { 2270 return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1); 2271 } else if (mByteOrder == BIG_ENDIAN) { 2272 return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4); 2273 } 2274 throw new IOException("Invalid byte order: " + mByteOrder); 2275 } 2276 2277 @Override 2278 public long skip(long byteCount) { 2279 long skipped = super.skip(Math.min(byteCount, mLength - mPosition)); 2280 mPosition += skipped; 2281 return skipped; 2282 } 2283 2284 public int readUnsignedShort() throws IOException { 2285 mPosition += 2; 2286 if (mPosition > mLength) { 2287 throw new EOFException(); 2288 } 2289 int ch1 = super.read(); 2290 int ch2 = super.read(); 2291 if ((ch1 | ch2) < 0) { 2292 throw new EOFException(); 2293 } 2294 if (mByteOrder == LITTLE_ENDIAN) { 2295 return ((ch2 << 8) + (ch1)); 2296 } else if (mByteOrder == BIG_ENDIAN) { 2297 return ((ch1 << 8) + (ch2)); 2298 } 2299 throw new IOException("Invalid byte order: " + mByteOrder); 2300 } 2301 2302 public long readUnsignedInt() throws IOException { 2303 return readInt() & 0xffffffffL; 2304 } 2305 2306 public long readLong() throws IOException { 2307 mPosition += 8; 2308 if (mPosition > mLength) { 2309 throw new EOFException(); 2310 } 2311 int ch1 = super.read(); 2312 int ch2 = super.read(); 2313 int ch3 = super.read(); 2314 int ch4 = super.read(); 2315 int ch5 = super.read(); 2316 int ch6 = super.read(); 2317 int ch7 = super.read(); 2318 int ch8 = super.read(); 2319 if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) { 2320 throw new EOFException(); 2321 } 2322 if (mByteOrder == LITTLE_ENDIAN) { 2323 return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40) 2324 + ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16) 2325 + ((long) ch2 << 8) + (long) ch1); 2326 } else if (mByteOrder == BIG_ENDIAN) { 2327 return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40) 2328 + ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16) 2329 + ((long) ch7 << 8) + (long) ch8); 2330 } 2331 throw new IOException("Invalid byte order: " + mByteOrder); 2332 } 2333 2334 public float readFloat() throws IOException { 2335 return Float.intBitsToFloat(readInt()); 2336 } 2337 2338 public double readDouble() throws IOException { 2339 return Double.longBitsToDouble(readLong()); 2340 } 2341 } 2342 2343 // An output stream to write EXIF data area, that will be written in big endian byte order. 2344 private static class ExifDataOutputStream extends DataOutputStream { 2345 public ExifDataOutputStream(OutputStream out) { 2346 super(out); 2347 } 2348 2349 public void writeUnsignedShort(int val) throws IOException { 2350 writeShort((short) val); 2351 } 2352 2353 public void writeUnsignedInt(long val) throws IOException { 2354 writeInt((int) val); 2355 } 2356 } 2357 2358 // JNI methods for RAW formats. 2359 private static native void nativeInitRaw(); 2360 private static native byte[] nativeGetThumbnailFromAsset( 2361 long asset, int thumbnailOffset, int thumbnailLength); 2362 private static native HashMap nativeGetRawAttributesFromAsset(long asset); 2363 private static native HashMap nativeGetRawAttributesFromFileDescriptor(FileDescriptor fd); 2364 private static native HashMap nativeGetRawAttributesFromInputStream(InputStream in); 2365} 2366