ExifInterface.java revision 976bbaccc47daa700a9ac2fa4fe9b0b759cf343a
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 String. */ 165 public static final String TAG_F_NUMBER = "FNumber"; 166 /** Type is String. */ 167 public static final String TAG_APERTURE = "FNumber"; 168 /** Type is String. */ 169 public static final String TAG_FILE_SOURCE = "FileSource"; 170 /** Type is int. */ 171 public static final String TAG_FLASH = "Flash"; 172 /** Type is rational. */ 173 public static final String TAG_FLASH_ENERGY = "FlashEnergy"; 174 /** Type is String. */ 175 public static final String TAG_FLASHPIX_VERSION = "FlashpixVersion"; 176 /** Type is rational. */ 177 public static final String TAG_FOCAL_LENGTH = "FocalLength"; 178 /** Type is int. */ 179 public static final String TAG_FOCAL_LENGTH_IN_35MM_FILM = "FocalLengthIn35mmFilm"; 180 /** Type is int. */ 181 public static final String TAG_FOCAL_PLANE_RESOLUTION_UNIT = "FocalPlaneResolutionUnit"; 182 /** Type is rational. */ 183 public static final String TAG_FOCAL_PLANE_X_RESOLUTION = "FocalPlaneXResolution"; 184 /** Type is rational. */ 185 public static final String TAG_FOCAL_PLANE_Y_RESOLUTION = "FocalPlaneYResolution"; 186 /** Type is rational. */ 187 public static final String TAG_GAIN_CONTROL = "GainControl"; 188 /** Type is String. */ 189 public static final String TAG_ISO_SPEED_RATINGS = "ISOSpeedRatings"; 190 /** Type is String. */ 191 public static final String TAG_ISO = "ISOSpeedRatings"; 192 /** Type is String. */ 193 public static final String TAG_IMAGE_UNIQUE_ID = "ImageUniqueID"; 194 /** Type is int. */ 195 public static final String TAG_LIGHT_SOURCE = "LightSource"; 196 /** Type is String. */ 197 public static final String TAG_MAKER_NOTE = "MakerNote"; 198 /** Type is rational. */ 199 public static final String TAG_MAX_APERTURE_VALUE = "MaxApertureValue"; 200 /** Type is int. */ 201 public static final String TAG_METERING_MODE = "MeteringMode"; 202 /** Type is String. */ 203 public static final String TAG_OECF = "OECF"; 204 /** Type is int. */ 205 public static final String TAG_PIXEL_X_DIMENSION = "PixelXDimension"; 206 /** Type is int. */ 207 public static final String TAG_PIXEL_Y_DIMENSION = "PixelYDimension"; 208 /** Type is String. */ 209 public static final String TAG_RELATED_SOUND_FILE = "RelatedSoundFile"; 210 /** Type is int. */ 211 public static final String TAG_SATURATION = "Saturation"; 212 /** Type is int. */ 213 public static final String TAG_SCENE_CAPTURE_TYPE = "SceneCaptureType"; 214 /** Type is String. */ 215 public static final String TAG_SCENE_TYPE = "SceneType"; 216 /** Type is int. */ 217 public static final String TAG_SENSING_METHOD = "SensingMethod"; 218 /** Type is int. */ 219 public static final String TAG_SHARPNESS = "Sharpness"; 220 /** Type is rational. */ 221 public static final String TAG_SHUTTER_SPEED_VALUE = "ShutterSpeedValue"; 222 /** Type is String. */ 223 public static final String TAG_SPATIAL_FREQUENCY_RESPONSE = "SpatialFrequencyResponse"; 224 /** Type is String. */ 225 public static final String TAG_SPECTRAL_SENSITIVITY = "SpectralSensitivity"; 226 /** Type is int. */ 227 public static final String TAG_SUBSEC_TIME = "SubSecTime"; 228 /** Type is int. @hide */ 229 public static final String TAG_SUBSECTIME = "SubSecTime"; 230 /** Type is int. */ 231 public static final String TAG_SUBSEC_TIME_DIGITIZED = "SubSecTimeDigitized"; 232 /** Type is int. */ 233 public static final String TAG_SUBSEC_TIME_DIG = "SubSecTimeDigitized"; 234 /** Type is int. */ 235 public static final String TAG_SUBSEC_TIME_ORIG = "SubSecTimeOriginal"; 236 /** Type is int. */ 237 public static final String TAG_SUBSEC_TIME_ORIGINAL = "SubSecTimeOriginal"; 238 /** Type is int. */ 239 public static final String TAG_SUBJECT_AREA = "SubjectArea"; 240 /** Type is double. */ 241 public static final String TAG_SUBJECT_DISTANCE = "SubjectDistance"; 242 /** Type is int. */ 243 public static final String TAG_SUBJECT_DISTANCE_RANGE = "SubjectDistanceRange"; 244 /** Type is int. */ 245 public static final String TAG_SUBJECT_LOCATION = "SubjectLocation"; 246 /** Type is String. */ 247 public static final String TAG_USER_COMMENT = "UserComment"; 248 /** Type is int. */ 249 public static final String TAG_WHITE_BALANCE = "WhiteBalance"; 250 /** 251 * The altitude (in meters) based on the reference in TAG_GPS_ALTITUDE_REF. 252 * Type is rational. 253 */ 254 public static final String TAG_GPS_ALTITUDE = "GPSAltitude"; 255 /** 256 * 0 if the altitude is above sea level. 1 if the altitude is below sea 257 * level. Type is int. 258 */ 259 public static final String TAG_GPS_ALTITUDE_REF = "GPSAltitudeRef"; 260 /** Type is String. */ 261 public static final String TAG_GPS_AREA_INFORMATION = "GPSAreaInformation"; 262 /** Type is rational. */ 263 public static final String TAG_GPS_DOP = "GPSDOP"; 264 /** Type is String. */ 265 public static final String TAG_GPS_DATESTAMP = "GPSDateStamp"; 266 /** Type is rational. */ 267 public static final String TAG_GPS_DEST_BEARING = "GPSDestBearing"; 268 /** Type is String. */ 269 public static final String TAG_GPS_DEST_BEARING_REF = "GPSDestBearingRef"; 270 /** Type is rational. */ 271 public static final String TAG_GPS_DEST_DISTANCE = "GPSDestDistance"; 272 /** Type is String. */ 273 public static final String TAG_GPS_DEST_DISTANCE_REF = "GPSDestDistanceRef"; 274 /** Type is rational. */ 275 public static final String TAG_GPS_DEST_LATITUDE = "GPSDestLatitude"; 276 /** Type is String. */ 277 public static final String TAG_GPS_DEST_LATITUDE_REF = "GPSDestLatitudeRef"; 278 /** Type is rational. */ 279 public static final String TAG_GPS_DEST_LONGITUDE = "GPSDestLongitude"; 280 /** Type is String. */ 281 public static final String TAG_GPS_DEST_LONGITUDE_REF = "GPSDestLongitudeRef"; 282 /** Type is int. */ 283 public static final String TAG_GPS_DIFFERENTIAL = "GPSDifferential"; 284 /** Type is rational. */ 285 public static final String TAG_GPS_IMG_DIRECTION = "GPSImgDirection"; 286 /** Type is String. */ 287 public static final String TAG_GPS_IMG_DIRECTION_REF = "GPSImgDirectionRef"; 288 /** String. Format is "num1/denom1,num2/denom2,num3/denom3". */ 289 public static final String TAG_GPS_LATITUDE = "GPSLatitude"; 290 /** Type is String. */ 291 public static final String TAG_GPS_LATITUDE_REF = "GPSLatitudeRef"; 292 /** String. Format is "num1/denom1,num2/denom2,num3/denom3". */ 293 public static final String TAG_GPS_LONGITUDE = "GPSLongitude"; 294 /** Type is String. */ 295 public static final String TAG_GPS_LONGITUDE_REF = "GPSLongitudeRef"; 296 /** Type is String. */ 297 public static final String TAG_GPS_MAP_DATUM = "GPSMapDatum"; 298 /** Type is String. */ 299 public static final String TAG_GPS_MEASURE_MODE = "GPSMeasureMode"; 300 /** Type is String. Name of GPS processing method used for location finding. */ 301 public static final String TAG_GPS_PROCESSING_METHOD = "GPSProcessingMethod"; 302 /** Type is String. */ 303 public static final String TAG_GPS_SATELLITES = "GPSSatellites"; 304 /** Type is rational. */ 305 public static final String TAG_GPS_SPEED = "GPSSpeed"; 306 /** Type is String. */ 307 public static final String TAG_GPS_SPEED_REF = "GPSSpeedRef"; 308 /** Type is String. */ 309 public static final String TAG_GPS_STATUS = "GPSStatus"; 310 /** Type is String. */ 311 public static final String TAG_GPS_TIMESTAMP = "GPSTimeStamp"; 312 /** Type is rational. */ 313 public static final String TAG_GPS_TRACK = "GPSTrack"; 314 /** Type is String. */ 315 public static final String TAG_GPS_TRACK_REF = "GPSTrackRef"; 316 /** Type is String. */ 317 public static final String TAG_GPS_VERSION_ID = "GPSVersionID"; 318 /** Type is String. */ 319 public static final String TAG_INTEROPERABILITY_INDEX = "InteroperabilityIndex"; 320 /** Type is int. */ 321 public static final String TAG_THUMBNAIL_IMAGE_LENGTH = "ThumbnailImageLength"; 322 /** Type is int. */ 323 public static final String TAG_THUMBNAIL_IMAGE_WIDTH = "ThumbnailImageWidth"; 324 325 // Private tags used for pointing the other IFD offset. The types of the following tags are int. 326 private static final String TAG_EXIF_IFD_POINTER = "ExifIFDPointer"; 327 private static final String TAG_GPS_INFO_IFD_POINTER = "GPSInfoIFDPointer"; 328 private static final String TAG_INTEROPERABILITY_IFD_POINTER = "InteroperabilityIFDPointer"; 329 330 // Private tags used for thumbnail information. 331 private static final String TAG_HAS_THUMBNAIL = "hasThumbnail"; 332 private static final String TAG_THUMBNAIL_OFFSET = "thumbnailOffset"; 333 private static final String TAG_THUMBNAIL_LENGTH = "thumbnailLength"; 334 private static final String TAG_THUMBNAIL_DATA = "thumbnailData"; 335 336 // Constants used for the Orientation Exif tag. 337 public static final int ORIENTATION_UNDEFINED = 0; 338 public static final int ORIENTATION_NORMAL = 1; 339 public static final int ORIENTATION_FLIP_HORIZONTAL = 2; // left right reversed mirror 340 public static final int ORIENTATION_ROTATE_180 = 3; 341 public static final int ORIENTATION_FLIP_VERTICAL = 4; // upside down mirror 342 // flipped about top-left <--> bottom-right axis 343 public static final int ORIENTATION_TRANSPOSE = 5; 344 public static final int ORIENTATION_ROTATE_90 = 6; // rotate 90 cw to right it 345 // flipped about top-right <--> bottom-left axis 346 public static final int ORIENTATION_TRANSVERSE = 7; 347 public static final int ORIENTATION_ROTATE_270 = 8; // rotate 270 to right it 348 349 // Constants used for white balance 350 public static final int WHITEBALANCE_AUTO = 0; 351 public static final int WHITEBALANCE_MANUAL = 1; 352 353 private static final byte[] JPEG_SIGNATURE = new byte[] {(byte) 0xff, (byte) 0xd8, (byte) 0xff}; 354 private static final int JPEG_SIGNATURE_SIZE = 3; 355 356 private static SimpleDateFormat sFormatter; 357 358 // See Exchangeable image file format for digital still cameras: Exif version 2.2. 359 // The following values are for parsing EXIF data area. There are tag groups in EXIF data area. 360 // They are called "Image File Directory". They have multiple data formats to cover various 361 // image metadata from GPS longitude to camera model name. 362 363 // Types of Exif byte alignments (see JEITA CP-3451 page 10) 364 private static final short BYTE_ALIGN_II = 0x4949; // II: Intel order 365 private static final short BYTE_ALIGN_MM = 0x4d4d; // MM: Motorola order 366 367 // Formats for the value in IFD entry (See TIFF 6.0 spec Types page 15). 368 private static final int IFD_FORMAT_BYTE = 1; 369 private static final int IFD_FORMAT_STRING = 2; 370 private static final int IFD_FORMAT_USHORT = 3; 371 private static final int IFD_FORMAT_ULONG = 4; 372 private static final int IFD_FORMAT_URATIONAL = 5; 373 private static final int IFD_FORMAT_SBYTE = 6; 374 private static final int IFD_FORMAT_UNDEFINED = 7; 375 private static final int IFD_FORMAT_SSHORT = 8; 376 private static final int IFD_FORMAT_SLONG = 9; 377 private static final int IFD_FORMAT_SRATIONAL = 10; 378 private static final int IFD_FORMAT_SINGLE = 11; 379 private static final int IFD_FORMAT_DOUBLE = 12; 380 // Sizes of the components of each IFD value format 381 private static final int[] IFD_FORMAT_BYTES_PER_FORMAT = new int[] { 382 0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8 383 }; 384 private static final byte[] EXIF_ASCII_PREFIX = new byte[] { 385 0x41, 0x53, 0x43, 0x49, 0x49, 0x0, 0x0, 0x0 386 }; 387 388 // A class for indicating EXIF tag. 389 private static class ExifTag { 390 public final int number; 391 public final String name; 392 393 private ExifTag(String name, int number) { 394 this.name = name; 395 this.number = number; 396 } 397 } 398 399 // Primary image IFD TIFF tags (See JEITA CP-3451 Table 14. page 54). 400 private static final ExifTag[] IFD_TIFF_TAGS = new ExifTag[] { 401 new ExifTag(TAG_IMAGE_WIDTH, 256), 402 new ExifTag(TAG_IMAGE_LENGTH, 257), 403 new ExifTag(TAG_BITS_PER_SAMPLE, 258), 404 new ExifTag(TAG_COMPRESSION, 259), 405 new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262), 406 new ExifTag(TAG_IMAGE_DESCRIPTION, 270), 407 new ExifTag(TAG_MAKE, 271), 408 new ExifTag(TAG_MODEL, 272), 409 new ExifTag(TAG_STRIP_OFFSETS, 273), 410 new ExifTag(TAG_ORIENTATION, 274), 411 new ExifTag(TAG_SAMPLES_PER_PIXEL, 277), 412 new ExifTag(TAG_ROWS_PER_STRIP, 278), 413 new ExifTag(TAG_STRIP_BYTE_COUNTS, 279), 414 new ExifTag(TAG_X_RESOLUTION, 282), 415 new ExifTag(TAG_Y_RESOLUTION, 283), 416 new ExifTag(TAG_PLANAR_CONFIGURATION, 284), 417 new ExifTag(TAG_RESOLUTION_UNIT, 296), 418 new ExifTag(TAG_TRANSFER_FUNCTION, 301), 419 new ExifTag(TAG_SOFTWARE, 305), 420 new ExifTag(TAG_DATETIME, 306), 421 new ExifTag(TAG_ARTIST, 315), 422 new ExifTag(TAG_WHITE_POINT, 318), 423 new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319), 424 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513), 425 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514), 426 new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529), 427 new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530), 428 new ExifTag(TAG_Y_CB_CR_POSITIONING, 531), 429 new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532), 430 new ExifTag(TAG_COPYRIGHT, 33432), 431 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 432 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 433 }; 434 // Primary image IFD Exif Private tags (See JEITA CP-3451 Table 15. page 55). 435 private static final ExifTag[] IFD_EXIF_TAGS = new ExifTag[] { 436 new ExifTag(TAG_EXPOSURE_TIME, 33434), 437 new ExifTag(TAG_F_NUMBER, 33437), 438 new ExifTag(TAG_EXPOSURE_PROGRAM, 34850), 439 new ExifTag(TAG_SPECTRAL_SENSITIVITY, 34852), 440 new ExifTag(TAG_ISO, 34855), 441 new ExifTag(TAG_OECF, 34856), 442 new ExifTag(TAG_EXIF_VERSION, 36864), 443 new ExifTag(TAG_DATETIME_ORIGINAL, 36867), 444 new ExifTag(TAG_DATETIME_DIGITIZED, 36868), 445 new ExifTag(TAG_COMPONENTS_CONFIGURATION, 37121), 446 new ExifTag(TAG_COMPRESSED_BITS_PER_PIXEL, 37122), 447 new ExifTag(TAG_SHUTTER_SPEED_VALUE, 37377), 448 new ExifTag(TAG_APERTURE_VALUE, 37378), 449 new ExifTag(TAG_BRIGHTNESS_VALUE, 37379), 450 new ExifTag(TAG_EXPOSURE_BIAS_VALUE, 37380), 451 new ExifTag(TAG_MAX_APERTURE_VALUE, 37381), 452 new ExifTag(TAG_SUBJECT_DISTANCE, 37382), 453 new ExifTag(TAG_METERING_MODE, 37383), 454 new ExifTag(TAG_LIGHT_SOURCE, 37384), 455 new ExifTag(TAG_FLASH, 37385), 456 new ExifTag(TAG_FOCAL_LENGTH, 37386), 457 new ExifTag(TAG_SUBJECT_AREA, 37396), 458 new ExifTag(TAG_MAKER_NOTE, 37500), 459 new ExifTag(TAG_USER_COMMENT, 37510), 460 new ExifTag(TAG_SUBSEC_TIME, 37520), 461 new ExifTag(TAG_SUBSEC_TIME_ORIG, 37521), 462 new ExifTag(TAG_SUBSEC_TIME_DIG, 37522), 463 new ExifTag(TAG_FLASHPIX_VERSION, 40960), 464 new ExifTag(TAG_COLOR_SPACE, 40961), 465 new ExifTag(TAG_PIXEL_X_DIMENSION, 40962), 466 new ExifTag(TAG_PIXEL_Y_DIMENSION, 40963), 467 new ExifTag(TAG_RELATED_SOUND_FILE, 40964), 468 new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965), 469 new ExifTag(TAG_FLASH_ENERGY, 41483), 470 new ExifTag(TAG_SPATIAL_FREQUENCY_RESPONSE, 41484), 471 new ExifTag(TAG_FOCAL_PLANE_X_RESOLUTION, 41486), 472 new ExifTag(TAG_FOCAL_PLANE_Y_RESOLUTION, 41487), 473 new ExifTag(TAG_FOCAL_PLANE_RESOLUTION_UNIT, 41488), 474 new ExifTag(TAG_SUBJECT_LOCATION, 41492), 475 new ExifTag(TAG_EXPOSURE_INDEX, 41493), 476 new ExifTag(TAG_SENSING_METHOD, 41495), 477 new ExifTag(TAG_FILE_SOURCE, 41728), 478 new ExifTag(TAG_SCENE_TYPE, 41729), 479 new ExifTag(TAG_CFA_PATTERN, 41730), 480 new ExifTag(TAG_CUSTOM_RENDERED, 41985), 481 new ExifTag(TAG_EXPOSURE_MODE, 41986), 482 new ExifTag(TAG_WHITE_BALANCE, 41987), 483 new ExifTag(TAG_DIGITAL_ZOOM_RATIO, 41988), 484 new ExifTag(TAG_FOCAL_LENGTH_IN_35MM_FILM, 41989), 485 new ExifTag(TAG_SCENE_CAPTURE_TYPE, 41990), 486 new ExifTag(TAG_GAIN_CONTROL, 41991), 487 new ExifTag(TAG_CONTRAST, 41992), 488 new ExifTag(TAG_SATURATION, 41993), 489 new ExifTag(TAG_SHARPNESS, 41994), 490 new ExifTag(TAG_DEVICE_SETTING_DESCRIPTION, 41995), 491 new ExifTag(TAG_SUBJECT_DISTANCE_RANGE, 41996), 492 new ExifTag(TAG_IMAGE_UNIQUE_ID, 42016), 493 }; 494 // Primary image IFD GPS Info tags (See JEITA CP-3451 Table 16. page 56). 495 private static final ExifTag[] IFD_GPS_TAGS = new ExifTag[] { 496 new ExifTag(TAG_GPS_VERSION_ID, 0), 497 new ExifTag(TAG_GPS_LATITUDE_REF, 1), 498 new ExifTag(TAG_GPS_LATITUDE, 2), 499 new ExifTag(TAG_GPS_LONGITUDE_REF, 3), 500 new ExifTag(TAG_GPS_LONGITUDE, 4), 501 new ExifTag(TAG_GPS_ALTITUDE_REF, 5), 502 new ExifTag(TAG_GPS_ALTITUDE, 6), 503 new ExifTag(TAG_GPS_TIMESTAMP, 7), 504 new ExifTag(TAG_GPS_SATELLITES, 8), 505 new ExifTag(TAG_GPS_STATUS, 9), 506 new ExifTag(TAG_GPS_MEASURE_MODE, 10), 507 new ExifTag(TAG_GPS_DOP, 11), 508 new ExifTag(TAG_GPS_SPEED_REF, 12), 509 new ExifTag(TAG_GPS_SPEED, 13), 510 new ExifTag(TAG_GPS_TRACK_REF, 14), 511 new ExifTag(TAG_GPS_TRACK, 15), 512 new ExifTag(TAG_GPS_IMG_DIRECTION_REF, 16), 513 new ExifTag(TAG_GPS_IMG_DIRECTION, 17), 514 new ExifTag(TAG_GPS_MAP_DATUM, 18), 515 new ExifTag(TAG_GPS_DEST_LATITUDE_REF, 19), 516 new ExifTag(TAG_GPS_DEST_LATITUDE, 20), 517 new ExifTag(TAG_GPS_DEST_LONGITUDE_REF, 21), 518 new ExifTag(TAG_GPS_DEST_LONGITUDE, 22), 519 new ExifTag(TAG_GPS_DEST_BEARING_REF, 23), 520 new ExifTag(TAG_GPS_DEST_BEARING, 24), 521 new ExifTag(TAG_GPS_DEST_DISTANCE_REF, 25), 522 new ExifTag(TAG_GPS_DEST_DISTANCE, 26), 523 new ExifTag(TAG_GPS_PROCESSING_METHOD, 27), 524 new ExifTag(TAG_GPS_AREA_INFORMATION, 28), 525 new ExifTag(TAG_GPS_DATESTAMP, 29), 526 new ExifTag(TAG_GPS_DIFFERENTIAL, 30), 527 }; 528 // Primary image IFD Interoperability tag (See JEITA CP-3451 Table 17. page 56). 529 private static final ExifTag[] IFD_INTEROPERABILITY_TAGS = new ExifTag[] { 530 new ExifTag(TAG_INTEROPERABILITY_INDEX, 1), 531 }; 532 // IFD Thumbnail tags (See JEITA CP-3451 Table 18. page 57). 533 private static final ExifTag[] IFD_THUMBNAIL_TAGS = new ExifTag[] { 534 new ExifTag(TAG_THUMBNAIL_IMAGE_WIDTH, 256), 535 new ExifTag(TAG_THUMBNAIL_IMAGE_LENGTH, 257), 536 new ExifTag(TAG_BITS_PER_SAMPLE, 258), 537 new ExifTag(TAG_COMPRESSION, 259), 538 new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262), 539 new ExifTag(TAG_IMAGE_DESCRIPTION, 270), 540 new ExifTag(TAG_MAKE, 271), 541 new ExifTag(TAG_MODEL, 272), 542 new ExifTag(TAG_STRIP_OFFSETS, 273), 543 new ExifTag(TAG_ORIENTATION, 274), 544 new ExifTag(TAG_SAMPLES_PER_PIXEL, 277), 545 new ExifTag(TAG_ROWS_PER_STRIP, 278), 546 new ExifTag(TAG_STRIP_BYTE_COUNTS, 279), 547 new ExifTag(TAG_X_RESOLUTION, 282), 548 new ExifTag(TAG_Y_RESOLUTION, 283), 549 new ExifTag(TAG_PLANAR_CONFIGURATION, 284), 550 new ExifTag(TAG_RESOLUTION_UNIT, 296), 551 new ExifTag(TAG_TRANSFER_FUNCTION, 301), 552 new ExifTag(TAG_SOFTWARE, 305), 553 new ExifTag(TAG_DATETIME, 306), 554 new ExifTag(TAG_ARTIST, 315), 555 new ExifTag(TAG_WHITE_POINT, 318), 556 new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319), 557 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513), 558 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514), 559 new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529), 560 new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530), 561 new ExifTag(TAG_Y_CB_CR_POSITIONING, 531), 562 new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532), 563 new ExifTag(TAG_COPYRIGHT, 33432), 564 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 565 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 566 }; 567 568 // See JEITA CP-3451 Figure 5. page 9. 569 // The following values are used for indicating pointers to the other Image File Directorys. 570 571 // Indices of Exif Ifd tag groups 572 private static final int IFD_TIFF_HINT = 0; 573 private static final int IFD_EXIF_HINT = 1; 574 private static final int IFD_GPS_HINT = 2; 575 private static final int IFD_INTEROPERABILITY_HINT = 3; 576 private static final int IFD_THUMBNAIL_HINT = 4; 577 // List of Exif tag groups 578 private static final ExifTag[][] EXIF_TAGS = new ExifTag[][] { 579 IFD_TIFF_TAGS, IFD_EXIF_TAGS, IFD_GPS_TAGS, IFD_INTEROPERABILITY_TAGS, 580 IFD_THUMBNAIL_TAGS 581 }; 582 // List of tags for pointing to the other image file directory offset. 583 private static final ExifTag[] IFD_POINTER_TAGS = new ExifTag[] { 584 new ExifTag(TAG_EXIF_IFD_POINTER, 34665), 585 new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853), 586 new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965), 587 }; 588 // List of indices of the indicated tag groups according to the IFD_POINTER_TAGS 589 private static final int[] IFD_POINTER_TAG_HINTS = new int[] { 590 IFD_EXIF_HINT, IFD_GPS_HINT, IFD_INTEROPERABILITY_HINT 591 }; 592 // Tags for indicating the thumbnail offset and length 593 private static final ExifTag JPEG_INTERCHANGE_FORMAT_TAG = 594 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513); 595 private static final ExifTag JPEG_INTERCHANGE_FORMAT_LENGTH_TAG = 596 new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514); 597 598 // Mappings from tag number to tag name and each item represents one IFD tag group. 599 private static final HashMap[] sExifTagMapsForReading = new HashMap[EXIF_TAGS.length]; 600 // Mappings from tag name to tag number and each item represents one IFD tag group. 601 private static final HashMap[] sExifTagMapsForWriting = new HashMap[EXIF_TAGS.length]; 602 603 // See JPEG File Interchange Format Version 1.02. 604 // The following values are defined for handling JPEG streams. In this implementation, we are 605 // not only getting information from EXIF but also from some JPEG special segments such as 606 // MARKER_COM for user comment and MARKER_SOFx for image width and height. 607 608 // Identifier for EXIF APP1 segment in JPEG 609 private static final byte[] IDENTIFIER_EXIF_APP1 = 610 "Exif\0\0".getBytes(Charset.forName("US-ASCII")); 611 // JPEG segment markers, that each marker consumes two bytes beginning with 0xff and ending with 612 // the indicator. There is no SOF4, SOF8, SOF16 markers in JPEG and SOFx markers indicates start 613 // of frame(baseline DCT) and the image size info exists in its beginning part. 614 private static final byte MARKER = (byte) 0xff; 615 private static final byte MARKER_SOI = (byte) 0xd8; 616 private static final byte MARKER_SOF0 = (byte) 0xc0; 617 private static final byte MARKER_SOF1 = (byte) 0xc1; 618 private static final byte MARKER_SOF2 = (byte) 0xc2; 619 private static final byte MARKER_SOF3 = (byte) 0xc3; 620 private static final byte MARKER_SOF5 = (byte) 0xc5; 621 private static final byte MARKER_SOF6 = (byte) 0xc6; 622 private static final byte MARKER_SOF7 = (byte) 0xc7; 623 private static final byte MARKER_SOF9 = (byte) 0xc9; 624 private static final byte MARKER_SOF10 = (byte) 0xca; 625 private static final byte MARKER_SOF11 = (byte) 0xcb; 626 private static final byte MARKER_SOF13 = (byte) 0xcd; 627 private static final byte MARKER_SOF14 = (byte) 0xce; 628 private static final byte MARKER_SOF15 = (byte) 0xcf; 629 private static final byte MARKER_SOS = (byte) 0xda; 630 private static final byte MARKER_APP1 = (byte) 0xe1; 631 private static final byte MARKER_COM = (byte) 0xfe; 632 private static final byte MARKER_EOI = (byte) 0xd9; 633 634 static { 635 System.loadLibrary("media_jni"); 636 nativeInitRaw(); 637 sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss"); 638 sFormatter.setTimeZone(TimeZone.getTimeZone("UTC")); 639 640 // Build up the hash tables to look up Exif tags for reading Exif tags. 641 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 642 sExifTagMapsForReading[hint] = new HashMap(); 643 sExifTagMapsForWriting[hint] = new HashMap(); 644 for (ExifTag tag : EXIF_TAGS[hint]) { 645 sExifTagMapsForReading[hint].put(tag.number, tag.name); 646 sExifTagMapsForWriting[hint].put(tag.name, tag.number); 647 } 648 } 649 } 650 651 private final String mFilename; 652 private final FileDescriptor mSeekableFileDescriptor; 653 private final AssetManager.AssetInputStream mAssetInputStream; 654 private final boolean mIsInputStream; 655 private boolean mIsRaw; 656 private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length]; 657 private boolean mHasThumbnail; 658 // The following values used for indicating a thumbnail position. 659 private int mThumbnailOffset; 660 private int mThumbnailLength; 661 private byte[] mThumbnailBytes; 662 663 // Pattern to check non zero timestamp 664 private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*"); 665 666 /** 667 * Reads Exif tags from the specified image file. 668 */ 669 public ExifInterface(String filename) throws IOException { 670 if (filename == null) { 671 throw new IllegalArgumentException("filename cannot be null"); 672 } 673 FileInputStream in = null; 674 mAssetInputStream = null; 675 mFilename = filename; 676 mIsInputStream = false; 677 try { 678 in = new FileInputStream(filename); 679 if (isSeekableFD(in.getFD())) { 680 mSeekableFileDescriptor = in.getFD(); 681 } else { 682 mSeekableFileDescriptor = null; 683 } 684 loadAttributes(in); 685 } finally { 686 IoUtils.closeQuietly(in); 687 } 688 } 689 690 /** 691 * Reads Exif tags from the specified image file descriptor. Attribute mutation is supported 692 * for writable and seekable file descriptors only. 693 */ 694 public ExifInterface(FileDescriptor fileDescriptor) throws IOException { 695 if (fileDescriptor == null) { 696 throw new IllegalArgumentException("parcelFileDescriptor cannot be null"); 697 } 698 mAssetInputStream = null; 699 mFilename = null; 700 if (isSeekableFD(fileDescriptor)) { 701 mSeekableFileDescriptor = fileDescriptor; 702 // Keep the original file descriptor in order to save attributes when it's seekable. 703 // Otherwise, just close the given file descriptor after reading it because the save 704 // feature won't be working. 705 try { 706 fileDescriptor = Os.dup(fileDescriptor); 707 } catch (ErrnoException e) { 708 e.rethrowAsIOException(); 709 } 710 } else { 711 mSeekableFileDescriptor = null; 712 } 713 mIsInputStream = false; 714 FileInputStream in = null; 715 try { 716 in = new FileInputStream(fileDescriptor); 717 loadAttributes(in); 718 } finally { 719 IoUtils.closeQuietly(in); 720 } 721 } 722 723 /** 724 * Reads Exif tags from the specified image input stream. Attribute mutation is not supported 725 * for input streams. 726 */ 727 public ExifInterface(InputStream inputStream) throws IOException { 728 if (inputStream == null) { 729 throw new IllegalArgumentException("inputStream cannot be null"); 730 } 731 mFilename = null; 732 if (inputStream instanceof AssetManager.AssetInputStream) { 733 mAssetInputStream = (AssetManager.AssetInputStream) inputStream; 734 mSeekableFileDescriptor = null; 735 } else if (inputStream instanceof FileInputStream 736 && isSeekableFD(((FileInputStream) inputStream).getFD())) { 737 mAssetInputStream = null; 738 mSeekableFileDescriptor = ((FileInputStream) inputStream).getFD(); 739 } else { 740 mAssetInputStream = null; 741 mSeekableFileDescriptor = null; 742 } 743 mIsInputStream = true; 744 loadAttributes(inputStream); 745 } 746 747 /** 748 * Returns the value of the specified tag or {@code null} if there 749 * is no such tag in the image file. 750 * 751 * @param tag the name of the tag. 752 */ 753 public String getAttribute(String tag) { 754 // Retrieves all tag groups. The value from primary image tag group has a higher priority 755 // than the value from the thumbnail tag group if there are more than one candidates. 756 for (int i = 0; i < EXIF_TAGS.length; ++i) { 757 Object value = mAttributes[i].get(tag); 758 if (value != null) { 759 return (String) value; 760 } 761 } 762 return null; 763 } 764 765 /** 766 * Returns the integer value of the specified tag. If there is no such tag 767 * in the image file or the value cannot be parsed as integer, return 768 * <var>defaultValue</var>. 769 * 770 * @param tag the name of the tag. 771 * @param defaultValue the value to return if the tag is not available. 772 */ 773 public int getAttributeInt(String tag, int defaultValue) { 774 String value = getAttribute(tag); 775 if (value == null) return defaultValue; 776 try { 777 return Integer.valueOf(value); 778 } catch (NumberFormatException e) { 779 return defaultValue; 780 } 781 } 782 783 /** 784 * Returns the double value of the tag that is specified as rational or contains a 785 * double-formatted value. If there is no such tag in the image file or the value cannot be 786 * parsed as double, return <var>defaultValue</var>. 787 * 788 * @param tag the name of the tag. 789 * @param defaultValue the value to return if the tag is not available. 790 */ 791 public double getAttributeDouble(String tag, double defaultValue) { 792 String value = getAttribute(tag); 793 if (value == null) return defaultValue; 794 try { 795 int index = value.indexOf("/"); 796 if (index == -1) return Double.parseDouble(value); 797 double denom = Double.parseDouble(value.substring(index + 1)); 798 if (denom == 0) return defaultValue; 799 double num = Double.parseDouble(value.substring(0, index)); 800 return num / denom; 801 } catch (NumberFormatException e) { 802 return defaultValue; 803 } 804 } 805 806 /** 807 * Set the value of the specified tag. 808 * 809 * @param tag the name of the tag. 810 * @param value the value of the tag. 811 */ 812 public void setAttribute(String tag, String value) { 813 for (int i = 0 ; i < EXIF_TAGS.length; ++i) { 814 if (sExifTagMapsForWriting[i].containsKey(tag)) { 815 mAttributes[i].put(tag, value); 816 } 817 } 818 } 819 820 /** 821 * This function decides which parser to read the image data according to the given input stream 822 * type and the content of the input stream. In each case, it reads the first three bytes to 823 * determine whether the image data format is JPEG or not. 824 */ 825 private void loadAttributes(@NonNull InputStream in) throws IOException { 826 try { 827 // Initialize mAttributes. 828 for (int i = 0; i < EXIF_TAGS.length; ++i) { 829 mAttributes[i] = new HashMap(); 830 } 831 832 // Process RAW input stream 833 if (mAssetInputStream != null) { 834 long asset = mAssetInputStream.getNativeAsset(); 835 if (handleRawResult(nativeGetRawAttributesFromAsset(asset))) { 836 return; 837 } 838 } else if (mSeekableFileDescriptor != null) { 839 if (handleRawResult(nativeGetRawAttributesFromFileDescriptor( 840 mSeekableFileDescriptor))) { 841 return; 842 } 843 } else { 844 in = new BufferedInputStream(in, JPEG_SIGNATURE_SIZE); 845 if (!isJpegInputStream((BufferedInputStream) in) && handleRawResult( 846 nativeGetRawAttributesFromInputStream(in))) { 847 return; 848 } 849 } 850 851 // Process JPEG input stream 852 getJpegAttributes(in); 853 } catch (IOException e) { 854 // Ignore exceptions in order to keep the compatibility with the old versions of 855 // ExifInterface. 856 Log.w(TAG, "Invalid JPEG: ExifInterface got an unsupported image format file" 857 + "(ExifInterface supports JPEG and some RAW image formats only) " 858 + "or a corrupted JPEG file to ExifInterface.", e); 859 } finally { 860 if (DEBUG) { 861 printAttributes(); 862 } 863 } 864 } 865 866 private static boolean isJpegInputStream(BufferedInputStream in) throws IOException { 867 in.mark(JPEG_SIGNATURE_SIZE); 868 byte[] signatureBytes = new byte[JPEG_SIGNATURE_SIZE]; 869 if (in.read(signatureBytes) != JPEG_SIGNATURE_SIZE) { 870 throw new EOFException(); 871 } 872 boolean isJpeg = Arrays.equals(JPEG_SIGNATURE, signatureBytes); 873 in.reset(); 874 return isJpeg; 875 } 876 877 private boolean handleRawResult(HashMap map) { 878 if (map == null) { 879 return false; 880 } 881 882 // Mark for disabling the save feature. 883 mIsRaw = true; 884 885 for (Map.Entry entry : (Set<Map.Entry>) map.entrySet()) { 886 String attrName = (String) entry.getKey(); 887 888 switch (attrName) { 889 case TAG_HAS_THUMBNAIL: 890 mHasThumbnail = ((String) entry.getValue()).equalsIgnoreCase("true"); 891 break; 892 case TAG_THUMBNAIL_OFFSET: 893 mThumbnailOffset = Integer.parseInt((String) entry.getValue()); 894 break; 895 case TAG_THUMBNAIL_LENGTH: 896 mThumbnailLength = Integer.parseInt((String) entry.getValue()); 897 break; 898 case TAG_THUMBNAIL_DATA: 899 mThumbnailBytes = (byte[]) entry.getValue(); 900 break; 901 default: 902 setAttribute(attrName, (String) entry.getValue()); 903 break; 904 } 905 } 906 return true; 907 } 908 909 private static boolean isSeekableFD(FileDescriptor fd) throws IOException { 910 try { 911 Os.lseek(fd, 0, OsConstants.SEEK_CUR); 912 return true; 913 } catch (ErrnoException e) { 914 return false; 915 } 916 } 917 918 // Prints out attributes for debugging. 919 private void printAttributes() { 920 for (int i = 0; i < mAttributes.length; ++i) { 921 Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size()); 922 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 923 Log.d(TAG, "tagName: " + entry.getKey() + ", tagValue: " + entry.getValue()); 924 } 925 } 926 } 927 928 /** 929 * Save the tag data into the original image file. This is expensive because it involves 930 * copying all the data from one file to another and deleting the old file and renaming the 931 * other. It's best to use{@link #setAttribute(String,String)} to set all attributes to write 932 * and make a single call rather than multiple calls for each attribute. 933 */ 934 public void saveAttributes() throws IOException { 935 if (mIsRaw) { 936 throw new UnsupportedOperationException( 937 "ExifInterface does not support saving attributes on RAW formats."); 938 } 939 if (mIsInputStream || (mSeekableFileDescriptor == null && mFilename == null)) { 940 throw new UnsupportedOperationException( 941 "ExifInterface does not support saving attributes for the current input."); 942 } 943 944 // Keep the thumbnail in memory 945 mThumbnailBytes = getThumbnail(); 946 947 FileInputStream in = null; 948 FileOutputStream out = null; 949 File tempFile = null; 950 try { 951 // Move the original file to temporary file. 952 if (mFilename != null) { 953 tempFile = new File(mFilename + ".tmp"); 954 File originalFile = new File(mFilename); 955 if (!originalFile.renameTo(tempFile)) { 956 throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath()); 957 } 958 } else if (mSeekableFileDescriptor != null) { 959 tempFile = File.createTempFile("temp", "jpg"); 960 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 961 in = new FileInputStream(mSeekableFileDescriptor); 962 out = new FileOutputStream(tempFile); 963 Streams.copy(in, out); 964 } 965 } catch (ErrnoException e) { 966 e.rethrowAsIOException(); 967 } finally { 968 IoUtils.closeQuietly(in); 969 IoUtils.closeQuietly(out); 970 } 971 972 in = null; 973 out = null; 974 try { 975 // Save the new file. 976 in = new FileInputStream(tempFile); 977 if (mFilename != null) { 978 out = new FileOutputStream(mFilename); 979 } else if (mSeekableFileDescriptor != null) { 980 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 981 out = new FileOutputStream(mSeekableFileDescriptor); 982 } 983 saveJpegAttributes(in, out); 984 } catch (ErrnoException e) { 985 e.rethrowAsIOException(); 986 } finally { 987 IoUtils.closeQuietly(in); 988 IoUtils.closeQuietly(out); 989 tempFile.delete(); 990 } 991 992 // Discard the thumbnail in memory 993 mThumbnailBytes = null; 994 } 995 996 /** 997 * Returns true if the image file has a thumbnail. 998 */ 999 public boolean hasThumbnail() { 1000 return mHasThumbnail; 1001 } 1002 1003 /** 1004 * Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail. 1005 * The returned data is in JPEG format and can be decoded using 1006 * {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)} 1007 */ 1008 public byte[] getThumbnail() { 1009 if (!mHasThumbnail) { 1010 return null; 1011 } 1012 if (mThumbnailBytes != null) { 1013 return mThumbnailBytes; 1014 } 1015 1016 // Read the thumbnail. 1017 FileInputStream in = null; 1018 try { 1019 if (mAssetInputStream != null) { 1020 return nativeGetThumbnailFromAsset( 1021 mAssetInputStream.getNativeAsset(), mThumbnailOffset, mThumbnailLength); 1022 } else if (mFilename != null) { 1023 in = new FileInputStream(mFilename); 1024 } else if (mSeekableFileDescriptor != null) { 1025 FileDescriptor fileDescriptor = Os.dup(mSeekableFileDescriptor); 1026 Os.lseek(fileDescriptor, 0, OsConstants.SEEK_SET); 1027 in = new FileInputStream(fileDescriptor); 1028 } 1029 if (in == null) { 1030 // Should not be reached this. 1031 throw new FileNotFoundException(); 1032 } 1033 if (in.skip(mThumbnailOffset) != mThumbnailOffset) { 1034 throw new IOException("Corrupted image"); 1035 } 1036 byte[] buffer = new byte[mThumbnailLength]; 1037 if (in.read(buffer) != mThumbnailLength) { 1038 throw new IOException("Corrupted image"); 1039 } 1040 return buffer; 1041 } catch (IOException | ErrnoException e) { 1042 // Couldn't get a thumbnail image. 1043 } finally { 1044 IoUtils.closeQuietly(in); 1045 } 1046 return null; 1047 } 1048 1049 /** 1050 * Returns the offset and length of thumbnail inside the image file, or 1051 * {@code null} if there is no thumbnail. 1052 * 1053 * @return two-element array, the offset in the first value, and length in 1054 * the second, or {@code null} if no thumbnail was found. 1055 * @hide 1056 */ 1057 public long[] getThumbnailRange() { 1058 long[] range = new long[2]; 1059 range[0] = mThumbnailOffset; 1060 range[1] = mThumbnailLength; 1061 return range; 1062 } 1063 1064 /** 1065 * Stores the latitude and longitude value in a float array. The first element is 1066 * the latitude, and the second element is the longitude. Returns false if the 1067 * Exif tags are not available. 1068 */ 1069 public boolean getLatLong(float output[]) { 1070 String latValue = getAttribute(TAG_GPS_LATITUDE); 1071 String latRef = getAttribute(TAG_GPS_LATITUDE_REF); 1072 String lngValue = getAttribute(TAG_GPS_LONGITUDE); 1073 String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF); 1074 1075 if (latValue != null && latRef != null && lngValue != null && lngRef != null) { 1076 try { 1077 output[0] = convertRationalLatLonToFloat(latValue, latRef); 1078 output[1] = convertRationalLatLonToFloat(lngValue, lngRef); 1079 return true; 1080 } catch (IllegalArgumentException e) { 1081 // if values are not parseable 1082 } 1083 } 1084 1085 return false; 1086 } 1087 1088 /** 1089 * Return the altitude in meters. If the exif tag does not exist, return 1090 * <var>defaultValue</var>. 1091 * 1092 * @param defaultValue the value to return if the tag is not available. 1093 */ 1094 public double getAltitude(double defaultValue) { 1095 double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1); 1096 int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1); 1097 1098 if (altitude >= 0 && ref >= 0) { 1099 return (altitude * ((ref == 1) ? -1 : 1)); 1100 } else { 1101 return defaultValue; 1102 } 1103 } 1104 1105 /** 1106 * Returns number of milliseconds since Jan. 1, 1970, midnight local time. 1107 * Returns -1 if the date time information if not available. 1108 * @hide 1109 */ 1110 public long getDateTime() { 1111 String dateTimeString = getAttribute(TAG_DATETIME); 1112 if (dateTimeString == null 1113 || !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1; 1114 1115 ParsePosition pos = new ParsePosition(0); 1116 try { 1117 // The exif field is in local time. Parsing it as if it is UTC will yield time 1118 // since 1/1/1970 local time 1119 Date datetime = sFormatter.parse(dateTimeString, pos); 1120 if (datetime == null) return -1; 1121 long msecs = datetime.getTime(); 1122 1123 String subSecs = getAttribute(TAG_SUBSECTIME); 1124 if (subSecs != null) { 1125 try { 1126 long sub = Long.valueOf(subSecs); 1127 while (sub > 1000) { 1128 sub /= 10; 1129 } 1130 msecs += sub; 1131 } catch (NumberFormatException e) { 1132 // Ignored 1133 } 1134 } 1135 return msecs; 1136 } catch (IllegalArgumentException e) { 1137 return -1; 1138 } 1139 } 1140 1141 /** 1142 * Returns number of milliseconds since Jan. 1, 1970, midnight UTC. 1143 * Returns -1 if the date time information if not available. 1144 * @hide 1145 */ 1146 public long getGpsDateTime() { 1147 String date = getAttribute(TAG_GPS_DATESTAMP); 1148 String time = getAttribute(TAG_GPS_TIMESTAMP); 1149 if (date == null || time == null 1150 || (!sNonZeroTimePattern.matcher(date).matches() 1151 && !sNonZeroTimePattern.matcher(time).matches())) { 1152 return -1; 1153 } 1154 1155 String dateTimeString = date + ' ' + time; 1156 1157 ParsePosition pos = new ParsePosition(0); 1158 try { 1159 Date datetime = sFormatter.parse(dateTimeString, pos); 1160 if (datetime == null) return -1; 1161 return datetime.getTime(); 1162 } catch (IllegalArgumentException e) { 1163 return -1; 1164 } 1165 } 1166 1167 private static float convertRationalLatLonToFloat(String rationalString, String ref) { 1168 try { 1169 String [] parts = rationalString.split(","); 1170 1171 String [] pair; 1172 pair = parts[0].split("/"); 1173 double degrees = Double.parseDouble(pair[0].trim()) 1174 / Double.parseDouble(pair[1].trim()); 1175 1176 pair = parts[1].split("/"); 1177 double minutes = Double.parseDouble(pair[0].trim()) 1178 / Double.parseDouble(pair[1].trim()); 1179 1180 pair = parts[2].split("/"); 1181 double seconds = Double.parseDouble(pair[0].trim()) 1182 / Double.parseDouble(pair[1].trim()); 1183 1184 double result = degrees + (minutes / 60.0) + (seconds / 3600.0); 1185 if ((ref.equals("S") || ref.equals("W"))) { 1186 return (float) -result; 1187 } 1188 return (float) result; 1189 } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) { 1190 // Not valid 1191 throw new IllegalArgumentException(); 1192 } 1193 } 1194 1195 // Loads EXIF attributes from a JPEG input stream. 1196 private void getJpegAttributes(InputStream inputStream) throws IOException { 1197 // See JPEG File Interchange Format Specification page 5. 1198 if (DEBUG) { 1199 Log.d(TAG, "getJpegAttributes starting with: " + inputStream); 1200 } 1201 DataInputStream dataInputStream = new DataInputStream(inputStream); 1202 byte marker; 1203 int bytesRead = 0; 1204 if ((marker = dataInputStream.readByte()) != MARKER) { 1205 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1206 } 1207 ++bytesRead; 1208 if (dataInputStream.readByte() != MARKER_SOI) { 1209 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1210 } 1211 ++bytesRead; 1212 while (true) { 1213 marker = dataInputStream.readByte(); 1214 if (marker != MARKER) { 1215 throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff)); 1216 } 1217 ++bytesRead; 1218 marker = dataInputStream.readByte(); 1219 if (DEBUG) { 1220 Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff)); 1221 } 1222 ++bytesRead; 1223 1224 // EOI indicates the end of an image and in case of SOS, JPEG image stream starts and 1225 // the image data will terminate right after. 1226 if (marker == MARKER_EOI || marker == MARKER_SOS) { 1227 break; 1228 } 1229 int length = dataInputStream.readUnsignedShort() - 2; 1230 bytesRead += 2; 1231 if (DEBUG) { 1232 Log.d(TAG, "JPEG segment: " + Integer.toHexString(marker & 0xff) + " (length: " 1233 + (length + 2) + ")"); 1234 } 1235 if (length < 0) { 1236 throw new IOException("Invalid length"); 1237 } 1238 switch (marker) { 1239 case MARKER_APP1: { 1240 if (DEBUG) { 1241 Log.d(TAG, "MARKER_APP1"); 1242 } 1243 if (length < 6) { 1244 // Skip if it's not an EXIF APP1 segment. 1245 break; 1246 } 1247 byte[] identifier = new byte[6]; 1248 if (inputStream.read(identifier) != 6) { 1249 throw new IOException("Invalid exif"); 1250 } 1251 bytesRead += 6; 1252 length -= 6; 1253 if (!Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1254 // Skip if it's not an EXIF APP1 segment. 1255 break; 1256 } 1257 if (length <= 0) { 1258 throw new IOException("Invalid exif"); 1259 } 1260 if (DEBUG) { 1261 Log.d(TAG, "readExifSegment with a byte array (length: " + length + ")"); 1262 } 1263 byte[] bytes = new byte[length]; 1264 if (dataInputStream.read(bytes) != length) { 1265 throw new IOException("Invalid exif"); 1266 } 1267 readExifSegment(bytes, bytesRead); 1268 bytesRead += length; 1269 length = 0; 1270 break; 1271 } 1272 1273 case MARKER_COM: { 1274 byte[] bytes = new byte[length]; 1275 if (dataInputStream.read(bytes) != length) { 1276 throw new IOException("Invalid exif"); 1277 } 1278 length = 0; 1279 setAttribute("UserComment", new String(bytes, Charset.forName("US-ASCII"))); 1280 break; 1281 } 1282 1283 case MARKER_SOF0: 1284 case MARKER_SOF1: 1285 case MARKER_SOF2: 1286 case MARKER_SOF3: 1287 case MARKER_SOF5: 1288 case MARKER_SOF6: 1289 case MARKER_SOF7: 1290 case MARKER_SOF9: 1291 case MARKER_SOF10: 1292 case MARKER_SOF11: 1293 case MARKER_SOF13: 1294 case MARKER_SOF14: 1295 case MARKER_SOF15: { 1296 if (dataInputStream.skipBytes(1) != 1) { 1297 throw new IOException("Invalid SOFx"); 1298 } 1299 setAttribute("ImageLength", 1300 String.valueOf(dataInputStream.readUnsignedShort())); 1301 setAttribute("ImageWidth", String.valueOf(dataInputStream.readUnsignedShort())); 1302 length -= 5; 1303 break; 1304 } 1305 1306 default: { 1307 break; 1308 } 1309 } 1310 if (length < 0) { 1311 throw new IOException("Invalid length"); 1312 } 1313 if (dataInputStream.skipBytes(length) != length) { 1314 throw new IOException("Invalid JPEG segment"); 1315 } 1316 bytesRead += length; 1317 } 1318 } 1319 1320 // Stores a new JPEG image with EXIF attributes into a given output stream. 1321 private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream) 1322 throws IOException { 1323 // See JPEG File Interchange Format Specification page 5. 1324 if (DEBUG) { 1325 Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream 1326 + ", outputStream: " + outputStream + ")"); 1327 } 1328 DataInputStream dataInputStream = new DataInputStream(inputStream); 1329 ExifDataOutputStream dataOutputStream = new ExifDataOutputStream(outputStream); 1330 if (dataInputStream.readByte() != MARKER) { 1331 throw new IOException("Invalid marker"); 1332 } 1333 dataOutputStream.writeByte(MARKER); 1334 if (dataInputStream.readByte() != MARKER_SOI) { 1335 throw new IOException("Invalid marker"); 1336 } 1337 dataOutputStream.writeByte(MARKER_SOI); 1338 1339 // Write EXIF APP1 segment 1340 dataOutputStream.writeByte(MARKER); 1341 dataOutputStream.writeByte(MARKER_APP1); 1342 writeExifSegment(dataOutputStream, 6); 1343 1344 byte[] bytes = new byte[4096]; 1345 1346 while (true) { 1347 byte marker = dataInputStream.readByte(); 1348 if (marker != MARKER) { 1349 throw new IOException("Invalid marker"); 1350 } 1351 marker = dataInputStream.readByte(); 1352 switch (marker) { 1353 case MARKER_APP1: { 1354 int length = dataInputStream.readUnsignedShort() - 2; 1355 if (length < 0) { 1356 throw new IOException("Invalid length"); 1357 } 1358 byte[] identifier = new byte[6]; 1359 if (length >= 6) { 1360 if (dataInputStream.read(identifier) != 6) { 1361 throw new IOException("Invalid exif"); 1362 } 1363 if (Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1364 // Skip the original EXIF APP1 segment. 1365 if (dataInputStream.skip(length - 6) != length - 6) { 1366 throw new IOException("Invalid length"); 1367 } 1368 break; 1369 } 1370 } 1371 // Copy non-EXIF APP1 segment. 1372 dataOutputStream.writeByte(MARKER); 1373 dataOutputStream.writeByte(marker); 1374 dataOutputStream.writeUnsignedShort(length + 2); 1375 if (length >= 6) { 1376 length -= 6; 1377 dataOutputStream.write(identifier); 1378 } 1379 int read; 1380 while (length > 0 && (read = dataInputStream.read( 1381 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1382 dataOutputStream.write(bytes, 0, read); 1383 length -= read; 1384 } 1385 break; 1386 } 1387 case MARKER_EOI: 1388 case MARKER_SOS: { 1389 dataOutputStream.writeByte(MARKER); 1390 dataOutputStream.writeByte(marker); 1391 // Copy all the remaining data 1392 Streams.copy(dataInputStream, dataOutputStream); 1393 return; 1394 } 1395 default: { 1396 // Copy JPEG segment 1397 dataOutputStream.writeByte(MARKER); 1398 dataOutputStream.writeByte(marker); 1399 int length = dataInputStream.readUnsignedShort(); 1400 dataOutputStream.writeUnsignedShort(length); 1401 length -= 2; 1402 if (length < 0) { 1403 throw new IOException("Invalid length"); 1404 } 1405 int read; 1406 while (length > 0 && (read = dataInputStream.read( 1407 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1408 dataOutputStream.write(bytes, 0, read); 1409 length -= read; 1410 } 1411 break; 1412 } 1413 } 1414 } 1415 } 1416 1417 // Reads the given EXIF byte area and save its tag data into attributes. 1418 private void readExifSegment(byte[] exifBytes, int exifOffsetFromBeginning) throws IOException { 1419 // Parse TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1420 ByteOrderAwarenessDataInputStream dataInputStream = 1421 new ByteOrderAwarenessDataInputStream(exifBytes); 1422 1423 // Read byte align 1424 short byteOrder = dataInputStream.readShort(); 1425 switch (byteOrder) { 1426 case BYTE_ALIGN_II: 1427 if (DEBUG) { 1428 Log.d(TAG, "readExifSegment: Byte Align II"); 1429 } 1430 dataInputStream.setByteOrder(ByteOrder.LITTLE_ENDIAN); 1431 break; 1432 case BYTE_ALIGN_MM: 1433 if (DEBUG) { 1434 Log.d(TAG, "readExifSegment: Byte Align MM"); 1435 } 1436 dataInputStream.setByteOrder(ByteOrder.BIG_ENDIAN); 1437 break; 1438 default: 1439 throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder)); 1440 } 1441 1442 int startCode = dataInputStream.readUnsignedShort(); 1443 if (startCode != 0x2a) { 1444 throw new IOException("Invalid exif start: " + Integer.toHexString(startCode)); 1445 } 1446 1447 // Read first ifd offset 1448 long firstIfdOffset = dataInputStream.readUnsignedInt(); 1449 if (firstIfdOffset < 8 || firstIfdOffset >= exifBytes.length) { 1450 throw new IOException("Invalid first Ifd offset: " + firstIfdOffset); 1451 } 1452 firstIfdOffset -= 8; 1453 if (firstIfdOffset > 0) { 1454 if (dataInputStream.skip(firstIfdOffset) != firstIfdOffset) { 1455 throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset); 1456 } 1457 } 1458 1459 // Read primary image TIFF image file directory. 1460 readImageFileDirectory(dataInputStream, IFD_TIFF_HINT); 1461 1462 // Process thumbnail. 1463 String jpegInterchangeFormatString = getAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name); 1464 String jpegInterchangeFormatLengthString = 1465 getAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name); 1466 if (jpegInterchangeFormatString != null && jpegInterchangeFormatLengthString != null) { 1467 try { 1468 int jpegInterchangeFormat = Integer.parseInt(jpegInterchangeFormatString); 1469 int jpegInterchangeFormatLength = Integer 1470 .parseInt(jpegInterchangeFormatLengthString); 1471 // The following code limits the size of thumbnail size not to overflow EXIF data area. 1472 jpegInterchangeFormatLength = Math.min(jpegInterchangeFormat 1473 + jpegInterchangeFormatLength, exifOffsetFromBeginning + exifBytes.length) 1474 - jpegInterchangeFormat; 1475 if (jpegInterchangeFormat > 0 && jpegInterchangeFormatLength > 0) { 1476 mHasThumbnail = true; 1477 mThumbnailOffset = exifOffsetFromBeginning + jpegInterchangeFormat; 1478 mThumbnailLength = jpegInterchangeFormatLength; 1479 1480 if (mFilename == null && mAssetInputStream == null 1481 && mSeekableFileDescriptor == null) { 1482 // Save the thumbnail in memory if the input doesn't support reading again. 1483 byte[] thumbnailBytes = new byte[jpegInterchangeFormatLength]; 1484 dataInputStream.seek(jpegInterchangeFormat); 1485 dataInputStream.readFully(thumbnailBytes); 1486 mThumbnailBytes = thumbnailBytes; 1487 1488 if (DEBUG) { 1489 Bitmap bitmap = BitmapFactory.decodeByteArray( 1490 thumbnailBytes, 0, thumbnailBytes.length); 1491 Log.d(TAG, "Thumbnail offset: " + mThumbnailOffset + ", length: " 1492 + mThumbnailLength + ", width: " + bitmap.getWidth() 1493 + ", height: " 1494 + bitmap.getHeight()); 1495 } 1496 } 1497 } 1498 } catch (NumberFormatException e) { 1499 // Ignored the corrupted image. 1500 } 1501 } 1502 1503 // For compatibility, keep data formats as follows. 1504 convertToInt(TAG_IMAGE_WIDTH); 1505 convertToInt(TAG_IMAGE_LENGTH); 1506 convertToInt(TAG_ORIENTATION); 1507 convertToInt(TAG_FLASH); 1508 convertToRational(TAG_FOCAL_LENGTH); 1509 convertToDouble(TAG_DIGITAL_ZOOM_RATIO); 1510 convertToDouble(TAG_EXPOSURE_TIME); 1511 convertToDouble(TAG_F_NUMBER); 1512 convertToDouble(TAG_SUBJECT_DISTANCE); 1513 convertToInt(TAG_ISO); 1514 convertToDouble(TAG_EXPOSURE_BIAS_VALUE); 1515 convertToInt(TAG_WHITE_BALANCE); 1516 convertToInt(TAG_LIGHT_SOURCE); 1517 convertToInt(TAG_METERING_MODE); 1518 convertToInt(TAG_EXPOSURE_PROGRAM); 1519 convertToInt(TAG_EXPOSURE_MODE); 1520 convertToRational(TAG_GPS_ALTITUDE); 1521 convertToInt(TAG_GPS_ALTITUDE_REF); 1522 convertToRational(TAG_GPS_LONGITUDE); 1523 convertToRational(TAG_GPS_LATITUDE); 1524 convertToTimetamp(TAG_GPS_TIMESTAMP); 1525 1526 // The value of DATETIME tag has the same value of DATETIME_ORIGINAL tag. 1527 String valueOfDateTimeOriginal = getAttribute("DateTimeOriginal"); 1528 if (valueOfDateTimeOriginal != null) { 1529 setAttribute(TAG_DATETIME, valueOfDateTimeOriginal); 1530 } 1531 1532 // Add the default value. 1533 if (getAttribute(TAG_IMAGE_WIDTH) == null) { 1534 setAttribute(TAG_IMAGE_WIDTH, "0"); 1535 } 1536 if (getAttribute(TAG_IMAGE_LENGTH) == null) { 1537 setAttribute(TAG_IMAGE_LENGTH, "0"); 1538 } 1539 if (getAttribute(TAG_ORIENTATION) == null) { 1540 setAttribute(TAG_ORIENTATION, "0"); 1541 } 1542 if (getAttribute(TAG_LIGHT_SOURCE) == null) { 1543 setAttribute(TAG_LIGHT_SOURCE, "0"); 1544 } 1545 } 1546 1547 // Converts the tag value to timestamp; Otherwise deletes the given tag. 1548 private void convertToTimetamp(String tagName) { 1549 String entryValue = getAttribute(tagName); 1550 if (entryValue == null) return; 1551 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1552 String[] components = entryValue.split(","); 1553 if (dataFormat == IFD_FORMAT_SRATIONAL && components.length == 3) { 1554 StringBuilder stringBuilder = new StringBuilder(); 1555 for (String component : components) { 1556 if (stringBuilder.length() > 0) { 1557 stringBuilder.append(":"); 1558 } 1559 String[] rationalNumber = component.split("/"); 1560 int numerator = Integer.parseInt(rationalNumber[0]); 1561 int denominator = Integer.parseInt(rationalNumber[1]); 1562 if (denominator == 0) { 1563 numerator = 0; 1564 denominator = 1; 1565 } 1566 int value = numerator / denominator; 1567 stringBuilder.append(String.format("%02d", value)); 1568 } 1569 setAttribute(tagName, stringBuilder.toString()); 1570 } else if (dataFormat != IFD_FORMAT_STRING) { 1571 setAttribute(tagName, null); 1572 } 1573 } 1574 1575 // Checks the tag value of a given tag formatted in double type; Otherwise try to convert it to 1576 // double type or delete it. 1577 private void convertToDouble(String tagName) { 1578 String entryValue = getAttribute(tagName); 1579 if (entryValue == null) return; 1580 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1581 switch (dataFormat) { 1582 case IFD_FORMAT_SRATIONAL: { 1583 StringBuilder stringBuilder = new StringBuilder(); 1584 String[] components = entryValue.split(","); 1585 for (String component : components) { 1586 if (stringBuilder.length() > 0) { 1587 stringBuilder.append(","); 1588 } 1589 String[] rationalNumber = component.split("/"); 1590 int numerator = Integer.parseInt(rationalNumber[0]); 1591 int denominator = Integer.parseInt(rationalNumber[1]); 1592 if (denominator == 0) { 1593 numerator = 0; 1594 denominator = 1; 1595 } 1596 stringBuilder.append((double) numerator / denominator); 1597 } 1598 setAttribute(tagName, stringBuilder.toString()); 1599 break; 1600 } 1601 case IFD_FORMAT_DOUBLE: 1602 // Keep it as is. 1603 break; 1604 default: 1605 setAttribute(tagName, null); 1606 break; 1607 } 1608 } 1609 1610 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1611 private void convertToRational(String tagName) { 1612 String entryValue = getAttribute(tagName); 1613 if (entryValue == null) return; 1614 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1615 switch (dataFormat) { 1616 case IFD_FORMAT_SLONG: 1617 case IFD_FORMAT_DOUBLE: { 1618 StringBuilder stringBuilder = new StringBuilder(); 1619 String[] components = entryValue.split(","); 1620 for (String component : components) { 1621 if (stringBuilder.length() > 0) { 1622 stringBuilder.append(","); 1623 } 1624 double doubleValue = Double.parseDouble(component); 1625 stringBuilder.append((int) (doubleValue * 10000.0)).append("/").append(10000); 1626 } 1627 setAttribute(tagName, stringBuilder.toString()); 1628 break; 1629 } 1630 case IFD_FORMAT_SRATIONAL: 1631 // Keep it as is. 1632 break; 1633 default: 1634 setAttribute(tagName, null); 1635 break; 1636 } 1637 } 1638 1639 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1640 private void convertToInt(String tagName) { 1641 String entryValue = getAttribute(tagName); 1642 if (entryValue == null) return; 1643 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1644 if (dataFormat != IFD_FORMAT_SLONG) { 1645 setAttribute(tagName, null); 1646 } 1647 } 1648 1649 // Reads image file directory, which is a tag group in EXIF. 1650 private void readImageFileDirectory(ByteOrderAwarenessDataInputStream dataInputStream, int hint) 1651 throws IOException { 1652 if (dataInputStream.peek() + 2 > dataInputStream.mLength) { 1653 // Return if there is no data from the offset. 1654 return; 1655 } 1656 // See JEITA CP-3451 Figure 5. page 9. 1657 short numberOfDirectoryEntry = dataInputStream.readShort(); 1658 if (dataInputStream.peek() + 12 * numberOfDirectoryEntry > dataInputStream.mLength) { 1659 // Return if the size of entries is too big. 1660 return; 1661 } 1662 1663 if (DEBUG) { 1664 Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry); 1665 } 1666 1667 for (short i = 0; i < numberOfDirectoryEntry; ++i) { 1668 int tagNumber = dataInputStream.readUnsignedShort(); 1669 int dataFormat = dataInputStream.readUnsignedShort(); 1670 int numberOfComponents = dataInputStream.readInt(); 1671 long nextEntryOffset = dataInputStream.peek() + 4; // next four bytes is for data 1672 // offset or value. 1673 // Look up a corresponding tag from tag number 1674 String tagName = (String) sExifTagMapsForReading[hint].get(tagNumber); 1675 1676 if (DEBUG) { 1677 Log.d(TAG, String.format("hint: %d, tagNumber: %d, tagName: %s, dataFormat: %d, " + 1678 "numberOfComponents: %d", hint, tagNumber, tagName, dataFormat, 1679 numberOfComponents)); 1680 } 1681 1682 if (tagName == null || dataFormat <= 0 || 1683 dataFormat >= IFD_FORMAT_BYTES_PER_FORMAT.length) { 1684 // Skip if the parsed tag number is not defined or invalid data format. 1685 if (tagName == null) { 1686 Log.w(TAG, "Skip the tag entry since tag number is not defined: " + tagNumber); 1687 } else { 1688 Log.w(TAG, "Skip the tag entry since data format is invalid: " + dataFormat); 1689 } 1690 dataInputStream.seek(nextEntryOffset); 1691 continue; 1692 } 1693 1694 // Read a value from data field or seek to the value offset which is stored in data 1695 // field if the size of the entry value is bigger than 4. 1696 int byteCount = numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat]; 1697 if (byteCount > 4) { 1698 long offset = dataInputStream.readUnsignedInt(); 1699 if (DEBUG) { 1700 Log.d(TAG, "seek to data offset: " + offset); 1701 } 1702 if (offset + byteCount <= dataInputStream.mLength) { 1703 dataInputStream.seek(offset); 1704 } else { 1705 // Skip if invalid data offset. 1706 Log.w(TAG, "Skip the tag entry since data offset is invalid: " + offset); 1707 dataInputStream.seek(nextEntryOffset); 1708 continue; 1709 } 1710 } 1711 1712 // Recursively parse IFD when a IFD pointer tag appears. 1713 int innerIfdHint = getIfdHintFromTagNumber(tagNumber); 1714 if (DEBUG) { 1715 Log.d(TAG, "innerIfdHint: " + innerIfdHint + " byteCount: " + byteCount); 1716 } 1717 if (innerIfdHint >= 0) { 1718 long offset = -1L; 1719 // Get offset from data field 1720 switch (dataFormat) { 1721 case IFD_FORMAT_USHORT: { 1722 offset = dataInputStream.readUnsignedShort(); 1723 break; 1724 } 1725 case IFD_FORMAT_SSHORT: { 1726 offset = dataInputStream.readShort(); 1727 break; 1728 } 1729 case IFD_FORMAT_ULONG: { 1730 offset = dataInputStream.readUnsignedInt(); 1731 break; 1732 } 1733 case IFD_FORMAT_SLONG: { 1734 offset = dataInputStream.readInt(); 1735 break; 1736 } 1737 default: { 1738 // Nothing to do 1739 break; 1740 } 1741 } 1742 if (DEBUG) { 1743 Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tagName)); 1744 } 1745 if (offset > 0L && offset < dataInputStream.mLength) { 1746 dataInputStream.seek(offset); 1747 readImageFileDirectory(dataInputStream, innerIfdHint); 1748 } else { 1749 Log.w(TAG, "Skip jump into the IFD since its offset is invalid: " + offset); 1750 } 1751 1752 dataInputStream.seek(nextEntryOffset); 1753 continue; 1754 } 1755 1756 if (numberOfComponents == 1 || dataFormat == IFD_FORMAT_STRING 1757 || dataFormat == IFD_FORMAT_UNDEFINED) { 1758 String entryValue = readExifEntryValue( 1759 dataInputStream, dataFormat, numberOfComponents); 1760 if (entryValue != null) { 1761 setAttribute(tagName, entryValue); 1762 } 1763 } else { 1764 StringBuilder entryValueBuilder = new StringBuilder(); 1765 for (int c = 0; c < numberOfComponents; ++c) { 1766 if (entryValueBuilder.length() > 0) { 1767 entryValueBuilder.append(","); 1768 } 1769 entryValueBuilder.append(readExifEntryValue( 1770 dataInputStream, dataFormat, numberOfComponents)); 1771 } 1772 setAttribute(tagName, entryValueBuilder.toString()); 1773 } 1774 1775 if (dataInputStream.peek() != nextEntryOffset) { 1776 dataInputStream.seek(nextEntryOffset); 1777 } 1778 } 1779 1780 if (dataInputStream.peek() + 4 <= dataInputStream.mLength) { 1781 long nextIfdOffset = dataInputStream.readUnsignedInt(); 1782 if (DEBUG) { 1783 Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset)); 1784 } 1785 // The next IFD offset needs to be bigger than 8 1786 // since the first IFD offset is at least 8. 1787 if (nextIfdOffset > 8 && nextIfdOffset < dataInputStream.mLength) { 1788 dataInputStream.seek(nextIfdOffset); 1789 readImageFileDirectory(dataInputStream, IFD_THUMBNAIL_HINT); 1790 } 1791 } 1792 } 1793 1794 // Reads a value from where the entry value are stored. 1795 private String readExifEntryValue(ByteOrderAwarenessDataInputStream dataInputStream, 1796 int dataFormat, int numberOfComponents) throws IOException { 1797 // See TIFF 6.0 spec Types. page 15. 1798 switch (dataFormat) { 1799 case IFD_FORMAT_BYTE: { 1800 return String.valueOf(dataInputStream.readByte()); 1801 } 1802 case IFD_FORMAT_SBYTE: { 1803 return String.valueOf(dataInputStream.readByte() & 0xff); 1804 } 1805 case IFD_FORMAT_USHORT: { 1806 return String.valueOf(dataInputStream.readUnsignedShort()); 1807 } 1808 case IFD_FORMAT_SSHORT: { 1809 return String.valueOf(dataInputStream.readUnsignedInt()); 1810 } 1811 case IFD_FORMAT_ULONG: { 1812 return String.valueOf(dataInputStream.readInt()); 1813 } 1814 case IFD_FORMAT_SLONG: { 1815 return String.valueOf(dataInputStream.readInt()); 1816 } 1817 case IFD_FORMAT_URATIONAL: 1818 case IFD_FORMAT_SRATIONAL: { 1819 int numerator = dataInputStream.readInt(); 1820 int denominator = dataInputStream.readInt(); 1821 return numerator + "/" + denominator; 1822 } 1823 case IFD_FORMAT_SINGLE: { 1824 return String.valueOf(dataInputStream.readFloat()); 1825 } 1826 case IFD_FORMAT_DOUBLE: { 1827 return String.valueOf(dataInputStream.readDouble()); 1828 } 1829 case IFD_FORMAT_UNDEFINED: // Usually UNDEFINED format is ASCII. 1830 case IFD_FORMAT_STRING: { 1831 byte[] bytes = new byte[numberOfComponents]; 1832 dataInputStream.readFully(bytes); 1833 int index = 0; 1834 if (numberOfComponents >= EXIF_ASCII_PREFIX.length) { 1835 boolean same = true; 1836 for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) { 1837 if (bytes[i] != EXIF_ASCII_PREFIX[i]) { 1838 same = false; 1839 break; 1840 } 1841 } 1842 if (same) { 1843 index = EXIF_ASCII_PREFIX.length; 1844 } 1845 } 1846 1847 StringBuilder stringBuilder = new StringBuilder(); 1848 while (index < numberOfComponents) { 1849 int ch = bytes[index]; 1850 if (ch == 0) { 1851 break; 1852 } 1853 if (ch >= 32) { 1854 stringBuilder.append((char) ch); 1855 } 1856 else { 1857 stringBuilder.append('?'); 1858 } 1859 ++index; 1860 } 1861 return stringBuilder.toString(); 1862 } 1863 default: { 1864 // Nothing to do 1865 return null; 1866 } 1867 } 1868 } 1869 1870 // Gets the corresponding IFD group index of the given tag number for writing Exif Tags. 1871 private static int getIfdHintFromTagNumber(int tagNumber) { 1872 for (int i = 0; i < IFD_POINTER_TAG_HINTS.length; ++i) { 1873 if (IFD_POINTER_TAGS[i].number == tagNumber) { 1874 return IFD_POINTER_TAG_HINTS[i]; 1875 } 1876 } 1877 return -1; 1878 } 1879 1880 // Writes an Exif segment into the given output stream. 1881 private int writeExifSegment(ExifDataOutputStream dataOutputStream, int exifOffsetFromBeginning) 1882 throws IOException { 1883 // The following variables are for calculating each IFD tag group size in bytes. 1884 int[] ifdOffsets = new int[EXIF_TAGS.length]; 1885 int[] ifdDataSizes = new int[EXIF_TAGS.length]; 1886 1887 // Remove IFD pointer tags (we'll re-add it later.) 1888 for (ExifTag tag : IFD_POINTER_TAGS) { 1889 setAttribute(tag.name, null); 1890 } 1891 1892 // Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD 1893 // offset when there is one or more tags in the thumbnail IFD. 1894 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1895 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, "0"); 1896 } 1897 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1898 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, "0"); 1899 } 1900 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1901 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, "0"); 1902 } 1903 // Remove old thumbnail data 1904 setAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name, null); 1905 setAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, null); 1906 if (mHasThumbnail) { 1907 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, "0"); 1908 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1909 String.valueOf(mThumbnailLength)); 1910 } 1911 1912 // Remove null value tags. 1913 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1914 for (Object obj : mAttributes[hint].entrySet().toArray()) { 1915 Map.Entry entry = (Map.Entry) obj; 1916 if (entry.getValue() == null) { 1917 mAttributes[hint].remove(entry.getKey()); 1918 } 1919 } 1920 } 1921 1922 // Calculate IFD group data area sizes. IFD group data area is assigned to save the entry 1923 // value which has a bigger size than 4 bytes. 1924 for (int i = 0; i < 5; ++i) { 1925 int sum = 0; 1926 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 1927 String entryValue = (String) ((Map.Entry) entry).getValue(); 1928 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1929 int size = getSizeOfExifEntryValue(dataFormat, entryValue); 1930 if (size > 4) { 1931 sum += size; 1932 } 1933 } 1934 ifdDataSizes[i] += sum; 1935 } 1936 1937 // Calculate IFD offsets. 1938 int position = 8; 1939 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1940 if (!mAttributes[hint].isEmpty()) { 1941 ifdOffsets[hint] = position; 1942 position += 2 + mAttributes[hint].size() * 12 + 4 + ifdDataSizes[hint]; 1943 } 1944 } 1945 if (mHasThumbnail) { 1946 int thumbnailOffset = position; 1947 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, 1948 String.valueOf(thumbnailOffset)); 1949 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1950 String.valueOf(mThumbnailLength)); 1951 mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset; 1952 position += mThumbnailLength; 1953 } 1954 1955 // Calculate the total size 1956 int totalSize = position + 8; // eight bytes is for header part. 1957 if (DEBUG) { 1958 Log.d(TAG, "totalSize length: " + totalSize); 1959 for (int i = 0; i < 5; ++i) { 1960 Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d", 1961 i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i])); 1962 } 1963 } 1964 1965 // Update IFD pointer tags with the calculated offsets. 1966 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1967 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, 1968 String.valueOf(ifdOffsets[IFD_EXIF_HINT])); 1969 } 1970 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1971 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, 1972 String.valueOf(ifdOffsets[IFD_GPS_HINT])); 1973 } 1974 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1975 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, 1976 String.valueOf(ifdOffsets[IFD_INTEROPERABILITY_HINT])); 1977 } 1978 1979 // Write TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1980 dataOutputStream.writeUnsignedShort(totalSize); 1981 dataOutputStream.write(IDENTIFIER_EXIF_APP1); 1982 dataOutputStream.writeShort(BYTE_ALIGN_MM); 1983 dataOutputStream.writeUnsignedShort(0x2a); 1984 dataOutputStream.writeUnsignedInt(8); 1985 1986 // Write IFD groups. See JEITA CP-3451C Figure 7. page 12. 1987 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1988 if (!mAttributes[hint].isEmpty()) { 1989 // See JEITA CP-3451C 4.6.2 IFD structure. page 13. 1990 // Write entry count 1991 dataOutputStream.writeUnsignedShort(mAttributes[hint].size()); 1992 1993 // Write entry info 1994 int dataOffset = ifdOffsets[hint] + 2 + mAttributes[hint].size() * 12 + 4; 1995 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 1996 // Convert tag name to tag number. 1997 int tagNumber = (int) sExifTagMapsForWriting[hint].get(entry.getKey()); 1998 String entryValue = (String) entry.getValue(); 1999 2000 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2001 int numberOfComponents = getNumberOfComponentsInExifEntryValue(dataFormat, 2002 entryValue); 2003 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 2004 2005 dataOutputStream.writeUnsignedShort(tagNumber); 2006 dataOutputStream.writeUnsignedShort(dataFormat); 2007 dataOutputStream.writeInt(numberOfComponents); 2008 if (byteCount > 4) { 2009 dataOutputStream.writeUnsignedInt(dataOffset); 2010 dataOffset += byteCount; 2011 } else { 2012 int bytesWritten = writeExifEntryValue(dataOutputStream, entryValue); 2013 // Fill zero up to 4 bytes 2014 if (bytesWritten < 4) { 2015 for (int i = bytesWritten; i < 4; ++i) { 2016 dataOutputStream.write(0); 2017 } 2018 } 2019 } 2020 } 2021 2022 // Write the next offset. It writes the offset of thumbnail IFD if there is one or 2023 // more tags in the thumbnail IFD when the current IFD is the primary image TIFF 2024 // IFD; Otherwise 0. 2025 if (hint == 0 && !mAttributes[IFD_THUMBNAIL_HINT].isEmpty()) { 2026 dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_THUMBNAIL_HINT]); 2027 } else { 2028 dataOutputStream.writeUnsignedInt(0); 2029 } 2030 2031 // Write values of data field exceeding 4 bytes after the next offset. 2032 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 2033 String entryValue = (String) entry.getValue(); 2034 2035 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2036 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 2037 if (byteCount > 4) { 2038 writeExifEntryValue(dataOutputStream, entryValue); 2039 } 2040 } 2041 } 2042 } 2043 2044 // Write thumbnail 2045 if (mHasThumbnail) { 2046 dataOutputStream.write(getThumbnail()); 2047 } 2048 2049 return totalSize; 2050 } 2051 2052 // Writes EXIF entry value and its entry value type will be automatically determined. 2053 private static int writeExifEntryValue(ExifDataOutputStream dataOutputStream, String entryValue) 2054 throws IOException { 2055 int bytesWritten = 0; 2056 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2057 2058 if (dataFormat == IFD_FORMAT_STRING) { 2059 byte[] asciiArray = (entryValue + '\0').getBytes(Charset.forName("US-ASCII")); 2060 dataOutputStream.write(asciiArray); 2061 return asciiArray.length; 2062 } 2063 2064 // Values can be composed of several components. Each component is separated by char ','. 2065 String[] components = entryValue.split(","); 2066 for (String component : components) { 2067 switch (dataFormat) { 2068 case IFD_FORMAT_SLONG: 2069 dataOutputStream.writeInt(Integer.parseInt(component)); 2070 bytesWritten += 4; 2071 break; 2072 case IFD_FORMAT_DOUBLE: 2073 dataOutputStream.writeDouble(Double.parseDouble(component)); 2074 bytesWritten += 8; 2075 break; 2076 case IFD_FORMAT_SRATIONAL: 2077 String[] rationalNumber = component.split("/"); 2078 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[0])); 2079 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[1])); 2080 bytesWritten += 8; 2081 break; 2082 default: 2083 throw new IllegalArgumentException(); 2084 } 2085 } 2086 return bytesWritten; 2087 } 2088 2089 // Determines the data format of EXIF entry value. 2090 private static int getDataFormatOfExifEntryValue(String entryValue) { 2091 // See TIFF 6.0 spec Types. page 15. 2092 // Take the first component if there are more than one component. 2093 if (entryValue.contains(",")) { 2094 String[] entryValues = entryValue.split(","); 2095 int dataFormat = getDataFormatOfExifEntryValue(entryValues[0]); 2096 if (dataFormat == IFD_FORMAT_STRING) { 2097 return IFD_FORMAT_STRING; 2098 } 2099 for (int i = 1; i < entryValues.length; ++i) { 2100 if (getDataFormatOfExifEntryValue(entryValues[i]) != dataFormat) { 2101 return IFD_FORMAT_STRING; 2102 } 2103 } 2104 return dataFormat; 2105 } 2106 2107 if (entryValue.contains("/")) { 2108 String[] rationalNumber = entryValue.split("/"); 2109 if (rationalNumber.length == 2) { 2110 try { 2111 Integer.parseInt(rationalNumber[0]); 2112 Integer.parseInt(rationalNumber[1]); 2113 return IFD_FORMAT_SRATIONAL; 2114 } catch (NumberFormatException e) { 2115 // Ignored 2116 } 2117 } 2118 return IFD_FORMAT_STRING; 2119 } 2120 try { 2121 Integer.parseInt(entryValue); 2122 return IFD_FORMAT_SLONG; 2123 } catch (NumberFormatException e) { 2124 // Ignored 2125 } 2126 try { 2127 Double.parseDouble(entryValue); 2128 return IFD_FORMAT_DOUBLE; 2129 } catch (NumberFormatException e) { 2130 // Ignored 2131 } 2132 return IFD_FORMAT_STRING; 2133 } 2134 2135 // Determines the size of EXIF entry value. 2136 private static int getSizeOfExifEntryValue(int dataFormat, String entryValue) { 2137 // See TIFF 6.0 spec Types page 15. 2138 if (dataFormat == IFD_FORMAT_STRING) { 2139 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2140 } 2141 int bytesEstimated = 0; 2142 String[] components = entryValue.split(","); 2143 for (String component : components) { 2144 switch (dataFormat) { 2145 case IFD_FORMAT_SLONG: 2146 bytesEstimated += 4; 2147 break; 2148 case IFD_FORMAT_DOUBLE: 2149 bytesEstimated += 8; 2150 break; 2151 case IFD_FORMAT_SRATIONAL: 2152 bytesEstimated += 8; 2153 break; 2154 default: 2155 throw new IllegalArgumentException(); 2156 } 2157 } 2158 return bytesEstimated; 2159 } 2160 2161 // Determines the number of components of EXIF entry value. 2162 private static int getNumberOfComponentsInExifEntryValue(int dataFormat, String entryValue) { 2163 if (dataFormat == IFD_FORMAT_STRING) { 2164 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2165 } 2166 int count = 1; 2167 for (int i = 0; i < entryValue.length(); ++i) { 2168 if (entryValue.charAt(i) == ',') { 2169 ++count; 2170 } 2171 } 2172 return count; 2173 } 2174 2175 // An input stream to parse EXIF data area, which can be written in either little or big endian 2176 // order. 2177 private static class ByteOrderAwarenessDataInputStream extends ByteArrayInputStream { 2178 private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN; 2179 private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN; 2180 2181 private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN; 2182 private final long mLength; 2183 private long mPosition; 2184 2185 public ByteOrderAwarenessDataInputStream(byte[] bytes) { 2186 super(bytes); 2187 mLength = bytes.length; 2188 mPosition = 0L; 2189 } 2190 2191 public void setByteOrder(ByteOrder byteOrder) { 2192 mByteOrder = byteOrder; 2193 } 2194 2195 public void seek(long byteCount) throws IOException { 2196 mPosition = 0L; 2197 reset(); 2198 if (skip(byteCount) != byteCount) { 2199 throw new IOException("Couldn't seek up to the byteCount"); 2200 } 2201 } 2202 2203 public long peek() { 2204 return mPosition; 2205 } 2206 2207 public void readFully(byte[] buffer) throws IOException { 2208 mPosition += buffer.length; 2209 if (mPosition > mLength) { 2210 throw new EOFException(); 2211 } 2212 if (super.read(buffer, 0, buffer.length) != buffer.length) { 2213 throw new IOException("Couldn't read up to the length of buffer"); 2214 } 2215 } 2216 2217 public byte readByte() throws IOException { 2218 ++mPosition; 2219 if (mPosition > mLength) { 2220 throw new EOFException(); 2221 } 2222 int ch = super.read(); 2223 if (ch < 0) { 2224 throw new EOFException(); 2225 } 2226 return (byte) ch; 2227 } 2228 2229 public short readShort() throws IOException { 2230 mPosition += 2; 2231 if (mPosition > mLength) { 2232 throw new EOFException(); 2233 } 2234 int ch1 = super.read(); 2235 int ch2 = super.read(); 2236 if ((ch1 | ch2) < 0) { 2237 throw new EOFException(); 2238 } 2239 if (mByteOrder == LITTLE_ENDIAN) { 2240 return (short) ((ch2 << 8) + (ch1)); 2241 } else if (mByteOrder == BIG_ENDIAN) { 2242 return (short) ((ch1 << 8) + (ch2)); 2243 } 2244 throw new IOException("Invalid byte order: " + mByteOrder); 2245 } 2246 2247 public int readInt() throws IOException { 2248 mPosition += 4; 2249 if (mPosition > mLength) { 2250 throw new EOFException(); 2251 } 2252 int ch1 = super.read(); 2253 int ch2 = super.read(); 2254 int ch3 = super.read(); 2255 int ch4 = super.read(); 2256 if ((ch1 | ch2 | ch3 | ch4) < 0) { 2257 throw new EOFException(); 2258 } 2259 if (mByteOrder == LITTLE_ENDIAN) { 2260 return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1); 2261 } else if (mByteOrder == BIG_ENDIAN) { 2262 return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4); 2263 } 2264 throw new IOException("Invalid byte order: " + mByteOrder); 2265 } 2266 2267 @Override 2268 public long skip(long byteCount) { 2269 long skipped = super.skip(Math.min(byteCount, mLength - mPosition)); 2270 mPosition += skipped; 2271 return skipped; 2272 } 2273 2274 public int readUnsignedShort() throws IOException { 2275 mPosition += 2; 2276 if (mPosition > mLength) { 2277 throw new EOFException(); 2278 } 2279 int ch1 = super.read(); 2280 int ch2 = super.read(); 2281 if ((ch1 | ch2) < 0) { 2282 throw new EOFException(); 2283 } 2284 if (mByteOrder == LITTLE_ENDIAN) { 2285 return ((ch2 << 8) + (ch1)); 2286 } else if (mByteOrder == BIG_ENDIAN) { 2287 return ((ch1 << 8) + (ch2)); 2288 } 2289 throw new IOException("Invalid byte order: " + mByteOrder); 2290 } 2291 2292 public long readUnsignedInt() throws IOException { 2293 return readInt() & 0xffffffffL; 2294 } 2295 2296 public long readLong() throws IOException { 2297 mPosition += 8; 2298 if (mPosition > mLength) { 2299 throw new EOFException(); 2300 } 2301 int ch1 = super.read(); 2302 int ch2 = super.read(); 2303 int ch3 = super.read(); 2304 int ch4 = super.read(); 2305 int ch5 = super.read(); 2306 int ch6 = super.read(); 2307 int ch7 = super.read(); 2308 int ch8 = super.read(); 2309 if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) { 2310 throw new EOFException(); 2311 } 2312 if (mByteOrder == LITTLE_ENDIAN) { 2313 return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40) 2314 + ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16) 2315 + ((long) ch2 << 8) + (long) ch1); 2316 } else if (mByteOrder == BIG_ENDIAN) { 2317 return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40) 2318 + ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16) 2319 + ((long) ch7 << 8) + (long) ch8); 2320 } 2321 throw new IOException("Invalid byte order: " + mByteOrder); 2322 } 2323 2324 public float readFloat() throws IOException { 2325 return Float.intBitsToFloat(readInt()); 2326 } 2327 2328 public double readDouble() throws IOException { 2329 return Double.longBitsToDouble(readLong()); 2330 } 2331 } 2332 2333 // An output stream to write EXIF data area, that will be written in big endian byte order. 2334 private static class ExifDataOutputStream extends DataOutputStream { 2335 public ExifDataOutputStream(OutputStream out) { 2336 super(out); 2337 } 2338 2339 public void writeUnsignedShort(int val) throws IOException { 2340 writeShort((short) val); 2341 } 2342 2343 public void writeUnsignedInt(long val) throws IOException { 2344 writeInt((int) val); 2345 } 2346 } 2347 2348 // JNI methods for RAW formats. 2349 private static native void nativeInitRaw(); 2350 private static native byte[] nativeGetThumbnailFromAsset( 2351 long asset, int thumbnailOffset, int thumbnailLength); 2352 private static native HashMap nativeGetRawAttributesFromAsset(long asset); 2353 private static native HashMap nativeGetRawAttributesFromFileDescriptor(FileDescriptor fd); 2354 private static native HashMap nativeGetRawAttributesFromInputStream(InputStream in); 2355} 2356