ExifInterface.java revision 89cb1945424f1d4c7278d24cd09f0a8d09093883
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 APP1 segment in JPEG 609 private static final byte[] IDENTIFIER_APP1 = "Exif\0\0".getBytes(Charset.forName("US-ASCII")); 610 // JPEG segment markers, that each marker consumes two bytes beginning with 0xff and ending with 611 // the indicator. There is no SOF4, SOF8, SOF16 markers in JPEG and SOFx markers indicates start 612 // of frame(baseline DCT) and the image size info exists in its beginning part. 613 private static final byte MARKER = (byte) 0xff; 614 private static final byte MARKER_SOI = (byte) 0xd8; 615 private static final byte MARKER_SOF0 = (byte) 0xc0; 616 private static final byte MARKER_SOF1 = (byte) 0xc1; 617 private static final byte MARKER_SOF2 = (byte) 0xc2; 618 private static final byte MARKER_SOF3 = (byte) 0xc3; 619 private static final byte MARKER_SOF5 = (byte) 0xc5; 620 private static final byte MARKER_SOF6 = (byte) 0xc6; 621 private static final byte MARKER_SOF7 = (byte) 0xc7; 622 private static final byte MARKER_SOF9 = (byte) 0xc9; 623 private static final byte MARKER_SOF10 = (byte) 0xca; 624 private static final byte MARKER_SOF11 = (byte) 0xcb; 625 private static final byte MARKER_SOF13 = (byte) 0xcd; 626 private static final byte MARKER_SOF14 = (byte) 0xce; 627 private static final byte MARKER_SOF15 = (byte) 0xcf; 628 private static final byte MARKER_SOS = (byte) 0xda; 629 private static final byte MARKER_APP1 = (byte) 0xe1; 630 private static final byte MARKER_COM = (byte) 0xfe; 631 private static final byte MARKER_EOI = (byte) 0xd9; 632 633 static { 634 System.loadLibrary("media_jni"); 635 nativeInitRaw(); 636 sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss"); 637 sFormatter.setTimeZone(TimeZone.getTimeZone("UTC")); 638 639 // Build up the hash tables to look up Exif tags for reading Exif tags. 640 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 641 sExifTagMapsForReading[hint] = new HashMap(); 642 sExifTagMapsForWriting[hint] = new HashMap(); 643 for (ExifTag tag : EXIF_TAGS[hint]) { 644 sExifTagMapsForReading[hint].put(tag.number, tag.name); 645 sExifTagMapsForWriting[hint].put(tag.name, tag.number); 646 } 647 } 648 } 649 650 private final String mFilename; 651 private final FileDescriptor mSeekableFileDescriptor; 652 private final AssetManager.AssetInputStream mAssetInputStream; 653 private boolean mIsRaw; 654 private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length]; 655 private boolean mHasThumbnail; 656 // The following values used for indicating a thumbnail position. 657 private int mThumbnailOffset; 658 private int mThumbnailLength; 659 private byte[] mThumbnailBytes; 660 661 // Pattern to check non zero timestamp 662 private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*"); 663 664 /** 665 * Reads Exif tags from the specified image file. 666 */ 667 public ExifInterface(String filename) throws IOException { 668 if (filename == null) { 669 throw new IllegalArgumentException("filename cannot be null"); 670 } 671 FileInputStream in = new FileInputStream(filename); 672 mAssetInputStream = null; 673 mFilename = filename; 674 if (isSeekableFD(in.getFD())) { 675 mSeekableFileDescriptor = in.getFD(); 676 } else { 677 mSeekableFileDescriptor = null; 678 } 679 loadAttributes(in); 680 } 681 682 /** 683 * Reads Exif tags from the specified image file descriptor. Attribute mutation is supported 684 * for seekable file descriptors only. 685 */ 686 public ExifInterface(FileDescriptor fileDescriptor) throws IOException { 687 if (fileDescriptor == null) { 688 throw new IllegalArgumentException("parcelFileDescriptor cannot be null"); 689 } 690 mAssetInputStream = null; 691 mFilename = null; 692 if (isSeekableFD(fileDescriptor)) { 693 mSeekableFileDescriptor = fileDescriptor; 694 } else { 695 mSeekableFileDescriptor = null; 696 } 697 loadAttributes(new FileInputStream(fileDescriptor)); 698 } 699 700 /** 701 * Reads Exif tags from the specified image input stream. Attribute mutation is not supported 702 * for input streams. 703 */ 704 public ExifInterface(InputStream inputStream) throws IOException { 705 if (inputStream == null) { 706 throw new IllegalArgumentException("inputStream cannot be null"); 707 } 708 mFilename = null; 709 if (inputStream instanceof AssetManager.AssetInputStream) { 710 mAssetInputStream = (AssetManager.AssetInputStream) inputStream; 711 mSeekableFileDescriptor = null; 712 } else if (inputStream instanceof FileInputStream 713 && isSeekableFD(((FileInputStream) inputStream).getFD())) { 714 mAssetInputStream = null; 715 mSeekableFileDescriptor = ((FileInputStream) inputStream).getFD(); 716 } else { 717 mAssetInputStream = null; 718 mSeekableFileDescriptor = null; 719 } 720 loadAttributes(inputStream); 721 } 722 723 /** 724 * Returns the value of the specified tag or {@code null} if there 725 * is no such tag in the image file. 726 * 727 * @param tag the name of the tag. 728 */ 729 public String getAttribute(String tag) { 730 // Retrieves all tag groups. The value from primary image tag group has a higher priority 731 // than the value from the thumbnail tag group if there are more than one candidates. 732 for (int i = 0; i < EXIF_TAGS.length; ++i) { 733 Object value = mAttributes[i].get(tag); 734 if (value != null) { 735 return (String) value; 736 } 737 } 738 return null; 739 } 740 741 /** 742 * Returns the integer value of the specified tag. If there is no such tag 743 * in the image file or the value cannot be parsed as integer, return 744 * <var>defaultValue</var>. 745 * 746 * @param tag the name of the tag. 747 * @param defaultValue the value to return if the tag is not available. 748 */ 749 public int getAttributeInt(String tag, int defaultValue) { 750 String value = getAttribute(tag); 751 if (value == null) return defaultValue; 752 try { 753 return Integer.valueOf(value); 754 } catch (NumberFormatException e) { 755 return defaultValue; 756 } 757 } 758 759 /** 760 * Returns the double value of the tag that is specified as rational or contains a 761 * double-formatted value. If there is no such tag in the image file or the value cannot be 762 * parsed as double, return <var>defaultValue</var>. 763 * 764 * @param tag the name of the tag. 765 * @param defaultValue the value to return if the tag is not available. 766 */ 767 public double getAttributeDouble(String tag, double defaultValue) { 768 String value = getAttribute(tag); 769 if (value == null) return defaultValue; 770 try { 771 int index = value.indexOf("/"); 772 if (index == -1) return Double.parseDouble(value); 773 double denom = Double.parseDouble(value.substring(index + 1)); 774 if (denom == 0) return defaultValue; 775 double num = Double.parseDouble(value.substring(0, index)); 776 return num / denom; 777 } catch (NumberFormatException e) { 778 return defaultValue; 779 } 780 } 781 782 /** 783 * Set the value of the specified tag. 784 * 785 * @param tag the name of the tag. 786 * @param value the value of the tag. 787 */ 788 public void setAttribute(String tag, String value) { 789 for (int i = 0 ; i < EXIF_TAGS.length; ++i) { 790 if (sExifTagMapsForWriting[i].containsKey(tag)) { 791 mAttributes[i].put(tag, value); 792 } 793 } 794 } 795 796 /** 797 * This function decides which parser to read the image data according to the given input stream 798 * type and the content of the input stream. In each case, it reads the first three bytes to 799 * determine whether the image data format is JPEG or not. 800 */ 801 private void loadAttributes(@NonNull InputStream in) throws IOException { 802 // Initialize mAttributes. 803 for (int i = 0; i < EXIF_TAGS.length; ++i) { 804 mAttributes[i] = new HashMap(); 805 } 806 807 // Process RAW input stream 808 if (mAssetInputStream != null) { 809 long asset = mAssetInputStream.getNativeAsset(); 810 if (handleRawResult(nativeGetRawAttributesFromAsset(asset))) { 811 return; 812 } 813 } else if (mSeekableFileDescriptor != null) { 814 if (handleRawResult(nativeGetRawAttributesFromFileDescriptor( 815 mSeekableFileDescriptor))) { 816 return; 817 } 818 } else { 819 in = new BufferedInputStream(in, JPEG_SIGNATURE_SIZE); 820 if (!isJpegInputStream((BufferedInputStream) in) && handleRawResult( 821 nativeGetRawAttributesFromInputStream(in))) { 822 return; 823 } 824 } 825 826 // Process JPEG input stream 827 getJpegAttributes(in); 828 829 if (DEBUG) { 830 printAttributes(); 831 } 832 } 833 834 private static boolean isJpegInputStream(BufferedInputStream in) throws IOException { 835 in.mark(JPEG_SIGNATURE_SIZE); 836 byte[] signatureBytes = new byte[JPEG_SIGNATURE_SIZE]; 837 if (in.read(signatureBytes) != JPEG_SIGNATURE_SIZE) { 838 throw new EOFException(); 839 } 840 boolean isJpeg = Arrays.equals(JPEG_SIGNATURE, signatureBytes); 841 in.reset(); 842 return isJpeg; 843 } 844 845 private boolean handleRawResult(HashMap map) { 846 if (map == null) { 847 return false; 848 } 849 850 // Mark for disabling the save feature. 851 mIsRaw = true; 852 853 for (Map.Entry entry : (Set<Map.Entry>) map.entrySet()) { 854 String attrName = (String) entry.getKey(); 855 856 switch (attrName) { 857 case TAG_HAS_THUMBNAIL: 858 mHasThumbnail = ((String) entry.getValue()).equalsIgnoreCase("true"); 859 break; 860 case TAG_THUMBNAIL_OFFSET: 861 mThumbnailOffset = Integer.parseInt((String) entry.getValue()); 862 break; 863 case TAG_THUMBNAIL_LENGTH: 864 mThumbnailLength = Integer.parseInt((String) entry.getValue()); 865 break; 866 case TAG_THUMBNAIL_DATA: 867 mThumbnailBytes = (byte[]) entry.getValue(); 868 break; 869 default: 870 setAttribute(attrName, (String) entry.getValue()); 871 break; 872 } 873 } 874 875 if (DEBUG) { 876 printAttributes(); 877 } 878 return true; 879 } 880 881 private static boolean isSeekableFD(FileDescriptor fd) throws IOException { 882 try { 883 Os.lseek(fd, 0, OsConstants.SEEK_CUR); 884 return true; 885 } catch (ErrnoException e) { 886 return false; 887 } 888 } 889 890 // Prints out attributes for debugging. 891 private void printAttributes() { 892 for (int i = 0; i < mAttributes.length; ++i) { 893 Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size()); 894 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 895 Log.d(TAG, "tagName: " + entry.getKey() + ", tagValue: " + entry.getValue()); 896 } 897 } 898 } 899 900 /** 901 * Save the tag data into the original image file. This is expensive because it involves 902 * copying all the data from one file to another and deleting the old file and renaming the 903 * other. It's best to use{@link #setAttribute(String,String)} to set all attributes to write 904 * and make a single call rather than multiple calls for each attribute. 905 */ 906 public void saveAttributes() throws IOException { 907 if (mIsRaw) { 908 throw new UnsupportedOperationException( 909 "ExifInterface does not support saving attributes on RAW formats."); 910 } 911 if (mSeekableFileDescriptor == null && mFilename == null) { 912 throw new UnsupportedOperationException( 913 "ExifInterface does not support saving attributes for the current input."); 914 } 915 916 // Keep the thumbnail in memory 917 mThumbnailBytes = getThumbnail(); 918 919 FileInputStream in = null; 920 FileOutputStream out = null; 921 File tempFile = null; 922 try { 923 // Move the original file to temporary file. 924 if (mFilename != null) { 925 tempFile = new File(mFilename + ".tmp"); 926 File originalFile = new File(mFilename); 927 if (!originalFile.renameTo(tempFile)) { 928 throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath()); 929 } 930 } else if (mSeekableFileDescriptor != null) { 931 tempFile = File.createTempFile("temp", "jpg"); 932 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 933 in = new FileInputStream(mSeekableFileDescriptor); 934 out = new FileOutputStream(tempFile); 935 Streams.copy(in, out); 936 } 937 } catch (ErrnoException e) { 938 e.rethrowAsIOException(); 939 } finally { 940 IoUtils.closeQuietly(in); 941 IoUtils.closeQuietly(out); 942 } 943 944 in = null; 945 out = null; 946 try { 947 // Save the new file. 948 in = new FileInputStream(tempFile); 949 if (mFilename != null) { 950 out = new FileOutputStream(mFilename); 951 } else if (mSeekableFileDescriptor != null) { 952 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 953 out = new FileOutputStream(mSeekableFileDescriptor); 954 } 955 saveJpegAttributes(in, out); 956 } catch (ErrnoException e) { 957 e.rethrowAsIOException(); 958 } finally { 959 IoUtils.closeQuietly(in); 960 IoUtils.closeQuietly(out); 961 tempFile.delete(); 962 } 963 964 // Discard the thumbnail in memory 965 mThumbnailBytes = null; 966 } 967 968 /** 969 * Returns true if the image file has a thumbnail. 970 */ 971 public boolean hasThumbnail() { 972 return mHasThumbnail; 973 } 974 975 /** 976 * Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail. 977 * The returned data is in JPEG format and can be decoded using 978 * {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)} 979 */ 980 public byte[] getThumbnail() { 981 if (!mHasThumbnail) { 982 return null; 983 } 984 if (mThumbnailBytes != null) { 985 return mThumbnailBytes; 986 } 987 988 // Read the thumbnail. 989 FileInputStream in = null; 990 try { 991 if (mAssetInputStream != null) { 992 return nativeGetThumbnailFromAsset( 993 mAssetInputStream.getNativeAsset(), mThumbnailOffset, mThumbnailLength); 994 } else if (mFilename != null) { 995 in = new FileInputStream(mFilename); 996 } else if (mSeekableFileDescriptor != null) { 997 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 998 in = new FileInputStream(mSeekableFileDescriptor); 999 } 1000 if (in == null) { 1001 // Should not be reached this. 1002 throw new FileNotFoundException(); 1003 } 1004 if (in.skip(mThumbnailOffset) != mThumbnailOffset) { 1005 throw new IOException("Corrupted image"); 1006 } 1007 byte[] buffer = new byte[mThumbnailLength]; 1008 if (in.read(buffer) != mThumbnailLength) { 1009 throw new IOException("Corrupted image"); 1010 } 1011 return buffer; 1012 } catch (IOException | ErrnoException e) { 1013 // Couldn't get a thumbnail image. 1014 } finally { 1015 IoUtils.closeQuietly(in); 1016 } 1017 return null; 1018 } 1019 1020 /** 1021 * Returns the offset and length of thumbnail inside the image file, or 1022 * {@code null} if there is no thumbnail. 1023 * 1024 * @return two-element array, the offset in the first value, and length in 1025 * the second, or {@code null} if no thumbnail was found. 1026 * @hide 1027 */ 1028 public long[] getThumbnailRange() { 1029 long[] range = new long[2]; 1030 range[0] = mThumbnailOffset; 1031 range[1] = mThumbnailLength; 1032 return range; 1033 } 1034 1035 /** 1036 * Stores the latitude and longitude value in a float array. The first element is 1037 * the latitude, and the second element is the longitude. Returns false if the 1038 * Exif tags are not available. 1039 */ 1040 public boolean getLatLong(float output[]) { 1041 String latValue = getAttribute(TAG_GPS_LATITUDE); 1042 String latRef = getAttribute(TAG_GPS_LATITUDE_REF); 1043 String lngValue = getAttribute(TAG_GPS_LONGITUDE); 1044 String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF); 1045 1046 if (latValue != null && latRef != null && lngValue != null && lngRef != null) { 1047 try { 1048 output[0] = convertRationalLatLonToFloat(latValue, latRef); 1049 output[1] = convertRationalLatLonToFloat(lngValue, lngRef); 1050 return true; 1051 } catch (IllegalArgumentException e) { 1052 // if values are not parseable 1053 } 1054 } 1055 1056 return false; 1057 } 1058 1059 /** 1060 * Return the altitude in meters. If the exif tag does not exist, return 1061 * <var>defaultValue</var>. 1062 * 1063 * @param defaultValue the value to return if the tag is not available. 1064 */ 1065 public double getAltitude(double defaultValue) { 1066 double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1); 1067 int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1); 1068 1069 if (altitude >= 0 && ref >= 0) { 1070 return (altitude * ((ref == 1) ? -1 : 1)); 1071 } else { 1072 return defaultValue; 1073 } 1074 } 1075 1076 /** 1077 * Returns number of milliseconds since Jan. 1, 1970, midnight local time. 1078 * Returns -1 if the date time information if not available. 1079 * @hide 1080 */ 1081 public long getDateTime() { 1082 String dateTimeString = getAttribute(TAG_DATETIME); 1083 if (dateTimeString == null 1084 || !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1; 1085 1086 ParsePosition pos = new ParsePosition(0); 1087 try { 1088 // The exif field is in local time. Parsing it as if it is UTC will yield time 1089 // since 1/1/1970 local time 1090 Date datetime = sFormatter.parse(dateTimeString, pos); 1091 if (datetime == null) return -1; 1092 long msecs = datetime.getTime(); 1093 1094 String subSecs = getAttribute(TAG_SUBSECTIME); 1095 if (subSecs != null) { 1096 try { 1097 long sub = Long.valueOf(subSecs); 1098 while (sub > 1000) { 1099 sub /= 10; 1100 } 1101 msecs += sub; 1102 } catch (NumberFormatException e) { 1103 // Ignored 1104 } 1105 } 1106 return msecs; 1107 } catch (IllegalArgumentException e) { 1108 return -1; 1109 } 1110 } 1111 1112 /** 1113 * Returns number of milliseconds since Jan. 1, 1970, midnight UTC. 1114 * Returns -1 if the date time information if not available. 1115 * @hide 1116 */ 1117 public long getGpsDateTime() { 1118 String date = getAttribute(TAG_GPS_DATESTAMP); 1119 String time = getAttribute(TAG_GPS_TIMESTAMP); 1120 if (date == null || time == null 1121 || (!sNonZeroTimePattern.matcher(date).matches() 1122 && !sNonZeroTimePattern.matcher(time).matches())) return -1; 1123 1124 String dateTimeString = date + ' ' + time; 1125 1126 ParsePosition pos = new ParsePosition(0); 1127 try { 1128 Date datetime = sFormatter.parse(dateTimeString, pos); 1129 if (datetime == null) return -1; 1130 return datetime.getTime(); 1131 } catch (IllegalArgumentException e) { 1132 return -1; 1133 } 1134 } 1135 1136 private static float convertRationalLatLonToFloat(String rationalString, String ref) { 1137 try { 1138 String [] parts = rationalString.split(","); 1139 1140 String [] pair; 1141 pair = parts[0].split("/"); 1142 double degrees = Double.parseDouble(pair[0].trim()) 1143 / Double.parseDouble(pair[1].trim()); 1144 1145 pair = parts[1].split("/"); 1146 double minutes = Double.parseDouble(pair[0].trim()) 1147 / Double.parseDouble(pair[1].trim()); 1148 1149 pair = parts[2].split("/"); 1150 double seconds = Double.parseDouble(pair[0].trim()) 1151 / Double.parseDouble(pair[1].trim()); 1152 1153 double result = degrees + (minutes / 60.0) + (seconds / 3600.0); 1154 if ((ref.equals("S") || ref.equals("W"))) { 1155 return (float) -result; 1156 } 1157 return (float) result; 1158 } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) { 1159 // Not valid 1160 throw new IllegalArgumentException(); 1161 } 1162 } 1163 1164 // Loads EXIF attributes from a JPEG input stream. 1165 private void getJpegAttributes(InputStream inputStream) throws IOException { 1166 // See JPEG File Interchange Format Specification page 5. 1167 if (DEBUG) { 1168 Log.d(TAG, "getJpegAttributes starting with: " + inputStream); 1169 } 1170 DataInputStream dataInputStream = new DataInputStream(inputStream); 1171 byte marker; 1172 int bytesRead = 0; 1173 ++bytesRead; 1174 if ((marker = dataInputStream.readByte()) != MARKER) { 1175 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1176 } 1177 ++bytesRead; 1178 if (dataInputStream.readByte() != MARKER_SOI) { 1179 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1180 } 1181 while (true) { 1182 ++bytesRead; 1183 marker = dataInputStream.readByte(); 1184 if (marker != MARKER) { 1185 throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff)); 1186 } 1187 ++bytesRead; 1188 marker = dataInputStream.readByte(); 1189 if (DEBUG) { 1190 Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff)); 1191 } 1192 1193 // EOI indicates the end of an image and in case of SOS, JPEG image stream starts and 1194 // the image data will terminate right after. 1195 if (marker == MARKER_EOI || marker == MARKER_SOS) { 1196 break; 1197 } 1198 bytesRead += 2; 1199 int length = dataInputStream.readUnsignedShort() - 2; 1200 if (length < 0) 1201 throw new IOException("Invalid length"); 1202 bytesRead += length; 1203 switch (marker) { 1204 case MARKER_APP1: { 1205 if (DEBUG) { 1206 Log.d(TAG, "MARKER_APP1"); 1207 } 1208 bytesRead -= length; 1209 if (length < 6) { 1210 throw new IOException("Invalid exif"); 1211 } 1212 byte[] identifier = new byte[6]; 1213 if (inputStream.read(identifier) != 6) { 1214 throw new IOException("Invalid exif"); 1215 } 1216 if (!Arrays.equals(identifier, IDENTIFIER_APP1)) { 1217 throw new IOException("Invalid app1 identifier"); 1218 } 1219 bytesRead += 6; 1220 length -= 6; 1221 if (length <= 0) { 1222 throw new IOException("Invalid exif"); 1223 } 1224 byte[] bytes = new byte[length]; 1225 if (dataInputStream.read(bytes) != length) { 1226 throw new IOException("Invalid exif"); 1227 } 1228 readExifSegment(bytes, bytesRead); 1229 bytesRead += length; 1230 length = 0; 1231 break; 1232 } 1233 1234 case MARKER_COM: { 1235 byte[] bytes = new byte[length]; 1236 if (dataInputStream.read(bytes) != length) { 1237 throw new IOException("Invalid exif"); 1238 } 1239 setAttribute("UserComment", new String(bytes, Charset.forName("US-ASCII"))); 1240 break; 1241 } 1242 1243 case MARKER_SOF0: 1244 case MARKER_SOF1: 1245 case MARKER_SOF2: 1246 case MARKER_SOF3: 1247 case MARKER_SOF5: 1248 case MARKER_SOF6: 1249 case MARKER_SOF7: 1250 case MARKER_SOF9: 1251 case MARKER_SOF10: 1252 case MARKER_SOF11: 1253 case MARKER_SOF13: 1254 case MARKER_SOF14: 1255 case MARKER_SOF15: { 1256 dataInputStream.skipBytes(1); 1257 setAttribute("ImageLength", 1258 String.valueOf(dataInputStream.readUnsignedShort())); 1259 setAttribute("ImageWidth", String.valueOf(dataInputStream.readUnsignedShort())); 1260 length -= 5; 1261 break; 1262 } 1263 1264 default: { 1265 break; 1266 } 1267 } 1268 if (length < 0) { 1269 throw new IOException("Invalid length"); 1270 } 1271 dataInputStream.skipBytes(length); 1272 } 1273 } 1274 1275 // Stores a new JPEG image with EXIF attributes into a given output stream. 1276 private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream) 1277 throws IOException { 1278 // See JPEG File Interchange Format Specification page 5. 1279 if (DEBUG) { 1280 Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream 1281 + ", outputStream: " + outputStream + ")"); 1282 } 1283 DataInputStream dataInputStream = new DataInputStream(inputStream); 1284 ExifDataOutputStream dataOutputStream = new ExifDataOutputStream(outputStream); 1285 int bytesRead = 0; 1286 ++bytesRead; 1287 if (dataInputStream.readByte() != MARKER) { 1288 throw new IOException("Invalid marker"); 1289 } 1290 dataOutputStream.writeByte(MARKER); 1291 ++bytesRead; 1292 if (dataInputStream.readByte() != MARKER_SOI) { 1293 throw new IOException("Invalid marker"); 1294 } 1295 dataOutputStream.writeByte(MARKER_SOI); 1296 1297 byte[] bytes = new byte[4096]; 1298 1299 while (true) { 1300 ++bytesRead; 1301 if (dataInputStream.readByte() != MARKER) { 1302 throw new IOException("Invalid marker"); 1303 } 1304 dataOutputStream.writeByte(MARKER); 1305 ++bytesRead; 1306 byte marker = dataInputStream.readByte(); 1307 dataOutputStream.writeByte(marker); 1308 switch (marker) { 1309 case MARKER_APP1: { 1310 // Rewrite EXIF segment 1311 int length = dataInputStream.readUnsignedShort() - 2; 1312 if (length < 0) 1313 throw new IOException("Invalid length"); 1314 bytesRead += 2; 1315 int read; 1316 while ((read = dataInputStream.read( 1317 bytes, 0, Math.min(length, bytes.length))) > 0) { 1318 length -= read; 1319 } 1320 bytesRead += length; 1321 writeExifSegment(dataOutputStream, bytesRead); 1322 break; 1323 } 1324 case MARKER_EOI: 1325 case MARKER_SOS: { 1326 // Copy all the remaining data 1327 Streams.copy(dataInputStream, dataOutputStream); 1328 return; 1329 } 1330 default: { 1331 // Copy JPEG segment 1332 int length = dataInputStream.readUnsignedShort(); 1333 dataOutputStream.writeUnsignedShort(length); 1334 if (length < 0) 1335 throw new IOException("Invalid length"); 1336 length -= 2; 1337 bytesRead += 2; 1338 int read; 1339 while ((read = dataInputStream.read( 1340 bytes, 0, Math.min(length, bytes.length))) > 0) { 1341 dataOutputStream.write(bytes, 0, read); 1342 length -= read; 1343 } 1344 bytesRead += length; 1345 break; 1346 } 1347 } 1348 } 1349 } 1350 1351 // Reads the given EXIF byte area and save its tag data into attributes. 1352 private void readExifSegment(byte[] exifBytes, int exifOffsetFromBeginning) throws IOException { 1353 // Parse TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1354 ByteOrderAwarenessDataInputStream dataInputStream = 1355 new ByteOrderAwarenessDataInputStream(exifBytes); 1356 1357 // Read byte align 1358 short byteOrder = dataInputStream.readShort(); 1359 switch (byteOrder) { 1360 case BYTE_ALIGN_II: 1361 if (DEBUG) { 1362 Log.d(TAG, "readExifSegment: Byte Align II"); 1363 } 1364 dataInputStream.setByteOrder(ByteOrder.LITTLE_ENDIAN); 1365 break; 1366 case BYTE_ALIGN_MM: 1367 if (DEBUG) { 1368 Log.d(TAG, "readExifSegment: Byte Align MM"); 1369 } 1370 dataInputStream.setByteOrder(ByteOrder.BIG_ENDIAN); 1371 break; 1372 default: 1373 throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder)); 1374 } 1375 1376 int startCode = dataInputStream.readUnsignedShort(); 1377 if (startCode != 0x2a) { 1378 throw new IOException("Invalid exif start: " + Integer.toHexString(startCode)); 1379 } 1380 1381 // Read first ifd offset 1382 long firstIfdOffset = dataInputStream.readUnsignedInt(); 1383 if (firstIfdOffset < 8 || firstIfdOffset >= exifBytes.length) { 1384 throw new IOException("Invalid first Ifd offset: " + firstIfdOffset); 1385 } 1386 firstIfdOffset -= 8; 1387 if (firstIfdOffset > 0) { 1388 if (dataInputStream.skip(firstIfdOffset) != firstIfdOffset) 1389 throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset); 1390 } 1391 1392 // Read primary image TIFF image file directory. 1393 readImageFileDirectory(dataInputStream, IFD_TIFF_HINT); 1394 1395 // Process thumbnail. 1396 String jpegInterchangeFormatString = getAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name); 1397 String jpegInterchangeFormatLengthString = 1398 getAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name); 1399 if (jpegInterchangeFormatString != null && jpegInterchangeFormatLengthString != null) { 1400 try { 1401 int jpegInterchangeFormat = Integer.parseInt(jpegInterchangeFormatString); 1402 int jpegInterchangeFormatLength = Integer 1403 .parseInt(jpegInterchangeFormatLengthString); 1404 // The following code limits the size of thumbnail size not to overflow EXIF data area. 1405 jpegInterchangeFormatLength = Math.min(jpegInterchangeFormat 1406 + jpegInterchangeFormatLength, exifOffsetFromBeginning + exifBytes.length) 1407 - jpegInterchangeFormat; 1408 if (jpegInterchangeFormat > 0 && jpegInterchangeFormatLength > 0) { 1409 mHasThumbnail = true; 1410 mThumbnailOffset = exifOffsetFromBeginning + jpegInterchangeFormat; 1411 mThumbnailLength = jpegInterchangeFormatLength; 1412 1413 if (mFilename == null && mAssetInputStream == null 1414 && mSeekableFileDescriptor == null) { 1415 // Save the thumbnail in memory if the input doesn't support reading again. 1416 byte[] thumbnailBytes = new byte[jpegInterchangeFormatLength]; 1417 dataInputStream.seek(jpegInterchangeFormat); 1418 dataInputStream.readFully(thumbnailBytes); 1419 mThumbnailBytes = thumbnailBytes; 1420 1421 if (DEBUG) { 1422 Bitmap bitmap = BitmapFactory.decodeByteArray( 1423 thumbnailBytes, 0, thumbnailBytes.length); 1424 Log.d(TAG, "Thumbnail offset: " + mThumbnailOffset + ", length: " 1425 + mThumbnailLength + ", width: " + bitmap.getWidth() 1426 + ", height: " 1427 + bitmap.getHeight()); 1428 } 1429 } 1430 } 1431 } catch (NumberFormatException e) { 1432 // Ignored the corrupted image. 1433 } 1434 } 1435 1436 // For compatibility, keep data formats as follows. 1437 convertToInt(TAG_IMAGE_WIDTH); 1438 convertToInt(TAG_IMAGE_LENGTH); 1439 convertToInt(TAG_ORIENTATION); 1440 convertToInt(TAG_FLASH); 1441 convertToRational(TAG_FOCAL_LENGTH); 1442 convertToDouble(TAG_DIGITAL_ZOOM_RATIO); 1443 convertToDouble(TAG_EXPOSURE_TIME); 1444 convertToDouble(TAG_F_NUMBER); 1445 convertToDouble(TAG_SUBJECT_DISTANCE); 1446 convertToInt(TAG_ISO); 1447 convertToDouble(TAG_EXPOSURE_BIAS_VALUE); 1448 convertToInt(TAG_WHITE_BALANCE); 1449 convertToInt(TAG_LIGHT_SOURCE); 1450 convertToInt(TAG_METERING_MODE); 1451 convertToInt(TAG_EXPOSURE_PROGRAM); 1452 convertToInt(TAG_EXPOSURE_MODE); 1453 convertToRational(TAG_GPS_ALTITUDE); 1454 convertToInt(TAG_GPS_ALTITUDE_REF); 1455 convertToRational(TAG_GPS_LONGITUDE); 1456 convertToRational(TAG_GPS_LATITUDE); 1457 convertToTimetamp(TAG_GPS_TIMESTAMP); 1458 1459 // The value of DATETIME tag has the same value of DATETIME_ORIGINAL tag. 1460 String valueOfDateTimeOriginal = getAttribute("DateTimeOriginal"); 1461 if (valueOfDateTimeOriginal != null) { 1462 setAttribute(TAG_DATETIME, valueOfDateTimeOriginal); 1463 } 1464 1465 // Add the default value. 1466 if (getAttribute(TAG_IMAGE_WIDTH) == null) { 1467 setAttribute(TAG_IMAGE_WIDTH, "0"); 1468 } 1469 if (getAttribute(TAG_IMAGE_LENGTH) == null) { 1470 setAttribute(TAG_IMAGE_LENGTH, "0"); 1471 } 1472 if (getAttribute(TAG_ORIENTATION) == null) { 1473 setAttribute(TAG_ORIENTATION, "0"); 1474 } 1475 if (getAttribute(TAG_LIGHT_SOURCE) == null) { 1476 setAttribute(TAG_LIGHT_SOURCE, "0"); 1477 } 1478 } 1479 1480 // Converts the tag value to timestamp; Otherwise deletes the given tag. 1481 private void convertToTimetamp(String tagName) { 1482 String entryValue = getAttribute(tagName); 1483 if (entryValue == null) return; 1484 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1485 String[] components = entryValue.split(","); 1486 if (dataFormat == IFD_FORMAT_SRATIONAL && components.length == 3) { 1487 StringBuilder stringBuilder = new StringBuilder(); 1488 for (String component : components) { 1489 if (stringBuilder.length() > 0) { 1490 stringBuilder.append(":"); 1491 } 1492 String[] rationalNumber = component.split("/"); 1493 int numerator = Integer.parseInt(rationalNumber[0]); 1494 int denominator = Integer.parseInt(rationalNumber[1]); 1495 if (denominator == 0) { 1496 numerator = 0; 1497 denominator = 1; 1498 } 1499 int value = numerator / denominator; 1500 stringBuilder.append(String.format("%02d", value)); 1501 } 1502 setAttribute(tagName, stringBuilder.toString()); 1503 } else if (dataFormat != IFD_FORMAT_STRING) { 1504 setAttribute(tagName, null); 1505 } 1506 } 1507 1508 // Checks the tag value of a given tag formatted in double type; Otherwise try to convert it to 1509 // double type or delete it. 1510 private void convertToDouble(String tagName) { 1511 String entryValue = getAttribute(tagName); 1512 if (entryValue == null) return; 1513 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1514 switch (dataFormat) { 1515 case IFD_FORMAT_SRATIONAL: { 1516 StringBuilder stringBuilder = new StringBuilder(); 1517 String[] components = entryValue.split(","); 1518 for (String component : components) { 1519 if (stringBuilder.length() > 0) { 1520 stringBuilder.append(","); 1521 } 1522 String[] rationalNumber = component.split("/"); 1523 int numerator = Integer.parseInt(rationalNumber[0]); 1524 int denominator = Integer.parseInt(rationalNumber[1]); 1525 if (denominator == 0) { 1526 numerator = 0; 1527 denominator = 1; 1528 } 1529 stringBuilder.append((double) numerator / denominator); 1530 } 1531 setAttribute(tagName, stringBuilder.toString()); 1532 break; 1533 } 1534 case IFD_FORMAT_DOUBLE: 1535 // Keep it as is. 1536 break; 1537 default: 1538 setAttribute(tagName, null); 1539 break; 1540 } 1541 } 1542 1543 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1544 private void convertToRational(String tagName) { 1545 String entryValue = getAttribute(tagName); 1546 if (entryValue == null) return; 1547 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1548 switch (dataFormat) { 1549 case IFD_FORMAT_SLONG: 1550 case IFD_FORMAT_DOUBLE: { 1551 StringBuilder stringBuilder = new StringBuilder(); 1552 String[] components = entryValue.split(","); 1553 for (String component : components) { 1554 if (stringBuilder.length() > 0) { 1555 stringBuilder.append(","); 1556 } 1557 double doubleValue = Double.parseDouble(component); 1558 stringBuilder.append((int) (doubleValue * 10000.0)).append("/").append(10000); 1559 } 1560 setAttribute(tagName, stringBuilder.toString()); 1561 break; 1562 } 1563 case IFD_FORMAT_SRATIONAL: 1564 // Keep it as is. 1565 break; 1566 default: 1567 setAttribute(tagName, null); 1568 break; 1569 } 1570 } 1571 1572 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1573 private void convertToInt(String tagName) { 1574 String entryValue = getAttribute(tagName); 1575 if (entryValue == null) return; 1576 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1577 if (dataFormat != IFD_FORMAT_SLONG) { 1578 setAttribute(tagName, null); 1579 } 1580 } 1581 1582 // Reads image file directory, which is a tag group in EXIF. 1583 private void readImageFileDirectory(ByteOrderAwarenessDataInputStream dataInputStream, int hint) 1584 throws IOException { 1585 // See JEITA CP-3451 Figure 5. page 9. 1586 short numberOfDirectoryEntry = dataInputStream.readShort(); 1587 1588 if (DEBUG) { 1589 Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry); 1590 } 1591 1592 for (short i = 0; i < numberOfDirectoryEntry; ++i) { 1593 int tagNumber = dataInputStream.readUnsignedShort(); 1594 int dataFormat = dataInputStream.readUnsignedShort(); 1595 int numberOfComponents = dataInputStream.readInt(); 1596 long nextEntryOffset = dataInputStream.peek() + 4; // next four bytes is for data 1597 // offset or value. 1598 1599 if (DEBUG) { 1600 Log.d(TAG, String.format("tagNumber: %d, dataFormat: %d, numberOfComponents: %d", 1601 tagNumber, dataFormat, numberOfComponents)); 1602 } 1603 1604 // Read a value from data field or seek to the value offset which is stored in data 1605 // field if the size of the entry value is bigger than 4. 1606 int byteCount = numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat]; 1607 if (byteCount > 4) { 1608 long offset = dataInputStream.readUnsignedInt(); 1609 if (DEBUG) { 1610 Log.d(TAG, "seek to data offset: " + offset); 1611 } 1612 dataInputStream.seek(offset); 1613 } 1614 1615 // Look up a corresponding tag from tag number 1616 String tagName = (String) sExifTagMapsForReading[hint].get(tagNumber); 1617 // Skip if the parsed tag number is not defined. 1618 if (tagName == null) { 1619 dataInputStream.seek(nextEntryOffset); 1620 continue; 1621 } 1622 1623 // Recursively parse IFD when a IFD pointer tag appears. 1624 int innerIfdHint = getIfdHintFromTagNumber(tagNumber); 1625 if (innerIfdHint >= 0) { 1626 long offset = -1L; 1627 // Get offset from data field 1628 switch (dataFormat) { 1629 case IFD_FORMAT_USHORT: { 1630 offset = dataInputStream.readUnsignedShort(); 1631 break; 1632 } 1633 case IFD_FORMAT_SSHORT: { 1634 offset = dataInputStream.readShort(); 1635 break; 1636 } 1637 case IFD_FORMAT_ULONG: { 1638 offset = dataInputStream.readUnsignedInt(); 1639 break; 1640 } 1641 case IFD_FORMAT_SLONG: { 1642 offset = dataInputStream.readInt(); 1643 break; 1644 } 1645 default: { 1646 // Nothing to do 1647 break; 1648 } 1649 } 1650 if (DEBUG) { 1651 Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tagName)); 1652 } 1653 if (offset > 0L) { 1654 dataInputStream.seek(offset); 1655 readImageFileDirectory(dataInputStream, innerIfdHint); 1656 } 1657 1658 dataInputStream.seek(nextEntryOffset); 1659 continue; 1660 } 1661 1662 if (numberOfComponents == 1 || dataFormat == IFD_FORMAT_STRING 1663 || dataFormat == IFD_FORMAT_UNDEFINED) { 1664 String entryValue = readExifEntryValue( 1665 dataInputStream, dataFormat, numberOfComponents); 1666 if (entryValue != null) { 1667 setAttribute(tagName, entryValue); 1668 } 1669 } else { 1670 StringBuilder entryValueBuilder = new StringBuilder(); 1671 for (int c = 0; c < numberOfComponents; ++c) { 1672 if (entryValueBuilder.length() > 0) { 1673 entryValueBuilder.append(","); 1674 } 1675 entryValueBuilder.append(readExifEntryValue( 1676 dataInputStream, dataFormat, numberOfComponents)); 1677 } 1678 setAttribute(tagName, entryValueBuilder.toString()); 1679 } 1680 1681 if (dataInputStream.peek() != nextEntryOffset) { 1682 dataInputStream.seek(nextEntryOffset); 1683 } 1684 } 1685 1686 long nextIfdOffset = dataInputStream.readUnsignedInt(); 1687 if (DEBUG) { 1688 Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset)); 1689 } 1690 // The next IFD offset needs to be bigger than 8 since the first IFD offset is at least 8. 1691 if (nextIfdOffset > 8) { 1692 dataInputStream.seek(nextIfdOffset); 1693 readImageFileDirectory(dataInputStream, IFD_THUMBNAIL_HINT); 1694 } 1695 } 1696 1697 // Reads a value from where the entry value are stored. 1698 private String readExifEntryValue(ByteOrderAwarenessDataInputStream dataInputStream, 1699 int dataFormat, int numberOfComponents) throws IOException { 1700 // See TIFF 6.0 spec Types. page 15. 1701 switch (dataFormat) { 1702 case IFD_FORMAT_BYTE: { 1703 return String.valueOf(dataInputStream.readByte()); 1704 } 1705 case IFD_FORMAT_SBYTE: { 1706 return String.valueOf(dataInputStream.readByte() & 0xff); 1707 } 1708 case IFD_FORMAT_USHORT: { 1709 return String.valueOf(dataInputStream.readUnsignedShort()); 1710 } 1711 case IFD_FORMAT_SSHORT: { 1712 return String.valueOf(dataInputStream.readUnsignedInt()); 1713 } 1714 case IFD_FORMAT_ULONG: { 1715 return String.valueOf(dataInputStream.readInt()); 1716 } 1717 case IFD_FORMAT_SLONG: { 1718 return String.valueOf(dataInputStream.readInt()); 1719 } 1720 case IFD_FORMAT_URATIONAL: 1721 case IFD_FORMAT_SRATIONAL: { 1722 int numerator = dataInputStream.readInt(); 1723 int denominator = dataInputStream.readInt(); 1724 return numerator + "/" + denominator; 1725 } 1726 case IFD_FORMAT_SINGLE: { 1727 return String.valueOf(dataInputStream.readFloat()); 1728 } 1729 case IFD_FORMAT_DOUBLE: { 1730 return String.valueOf(dataInputStream.readDouble()); 1731 } 1732 case IFD_FORMAT_UNDEFINED: // Usually UNDEFINED format is ASCII. 1733 case IFD_FORMAT_STRING: { 1734 byte[] bytes = new byte[numberOfComponents]; 1735 dataInputStream.readFully(bytes); 1736 int index = 0; 1737 if (numberOfComponents >= EXIF_ASCII_PREFIX.length) { 1738 boolean same = true; 1739 for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) { 1740 if (bytes[i] != EXIF_ASCII_PREFIX[i]) { 1741 same = false; 1742 break; 1743 } 1744 } 1745 if (same) { 1746 index = EXIF_ASCII_PREFIX.length; 1747 } 1748 } 1749 1750 StringBuilder stringBuilder = new StringBuilder(); 1751 while (true) { 1752 int ch = bytes[index]; 1753 if (ch == 0) 1754 break; 1755 if (ch >= 32) 1756 stringBuilder.append((char) ch); 1757 else 1758 stringBuilder.append('?'); 1759 ++index; 1760 if (index == numberOfComponents) 1761 break; 1762 } 1763 return stringBuilder.toString(); 1764 } 1765 default: { 1766 // Nothing to do 1767 return null; 1768 } 1769 } 1770 } 1771 1772 // Gets the corresponding IFD group index of the given tag number for writing Exif Tags. 1773 private static int getIfdHintFromTagNumber(int tagNumber) { 1774 for (int i = 0; i < IFD_POINTER_TAG_HINTS.length; ++i) { 1775 if (IFD_POINTER_TAGS[i].number == tagNumber) 1776 return IFD_POINTER_TAG_HINTS[i]; 1777 } 1778 return -1; 1779 } 1780 1781 // Writes an Exif segment into the given output stream. 1782 private int writeExifSegment(ExifDataOutputStream dataOutputStream, int exifOffsetFromBeginning) 1783 throws IOException { 1784 // The following variables are for calculating each IFD tag group size in bytes. 1785 int[] ifdOffsets = new int[EXIF_TAGS.length]; 1786 int[] ifdDataSizes = new int[EXIF_TAGS.length]; 1787 1788 // Remove IFD pointer tags (we'll re-add it later.) 1789 for (ExifTag tag : IFD_POINTER_TAGS) { 1790 setAttribute(tag.name, null); 1791 } 1792 1793 // Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD 1794 // offset when there is one or more tags in the thumbnail IFD. 1795 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1796 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, "0"); 1797 } 1798 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1799 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, "0"); 1800 } 1801 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1802 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, "0"); 1803 } 1804 // Remove old thumbnail data 1805 setAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name, null); 1806 setAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, null); 1807 if (mHasThumbnail) { 1808 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, "0"); 1809 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1810 String.valueOf(mThumbnailLength)); 1811 } 1812 1813 // Remove null value tags. 1814 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1815 for (Object obj : mAttributes[hint].entrySet().toArray()) { 1816 Map.Entry entry = (Map.Entry) obj; 1817 if (entry.getValue() == null) { 1818 mAttributes[hint].remove(entry.getKey()); 1819 } 1820 } 1821 } 1822 1823 // Calculate IFD group data area sizes. IFD group data area is assigned to save the entry 1824 // value which has a bigger size than 4 bytes. 1825 for (int i = 0; i < 5; ++i) { 1826 int sum = 0; 1827 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 1828 String entryValue = (String) ((Map.Entry) entry).getValue(); 1829 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1830 int size = getSizeOfExifEntryValue(dataFormat, entryValue); 1831 if (size > 4) { 1832 sum += size; 1833 } 1834 } 1835 ifdDataSizes[i] += sum; 1836 } 1837 1838 // Calculate IFD offsets. 1839 int position = 8; 1840 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1841 if (!mAttributes[hint].isEmpty()) { 1842 ifdOffsets[hint] = position; 1843 position += 2 + mAttributes[hint].size() * 12 + 4 + ifdDataSizes[hint]; 1844 } 1845 } 1846 if (mHasThumbnail) { 1847 int thumbnailOffset = position; 1848 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, 1849 String.valueOf(thumbnailOffset)); 1850 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1851 String.valueOf(mThumbnailLength)); 1852 mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset; 1853 position += mThumbnailLength; 1854 } 1855 1856 // Calculate the total size 1857 int totalSize = position + 8; // eight bytes is for header part. 1858 if (DEBUG) { 1859 Log.d(TAG, "totalSize length: " + totalSize); 1860 for (int i = 0; i < 5; ++i) { 1861 Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d", 1862 i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i])); 1863 } 1864 } 1865 1866 // Update IFD pointer tags with the calculated offsets. 1867 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1868 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, 1869 String.valueOf(ifdOffsets[IFD_EXIF_HINT])); 1870 } 1871 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1872 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, 1873 String.valueOf(ifdOffsets[IFD_GPS_HINT])); 1874 } 1875 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1876 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, 1877 String.valueOf(ifdOffsets[IFD_INTEROPERABILITY_HINT])); 1878 } 1879 1880 // Write TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1881 dataOutputStream.writeUnsignedShort(totalSize); 1882 dataOutputStream.write(IDENTIFIER_APP1); 1883 dataOutputStream.writeShort(BYTE_ALIGN_MM); 1884 dataOutputStream.writeUnsignedShort(0x2a); 1885 dataOutputStream.writeUnsignedInt(8); 1886 1887 // Write IFD groups. See JEITA CP-3451C Figure 7. page 12. 1888 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1889 if (!mAttributes[hint].isEmpty()) { 1890 // See JEITA CP-3451C 4.6.2 IFD structure. page 13. 1891 // Write entry count 1892 dataOutputStream.writeUnsignedShort(mAttributes[hint].size()); 1893 1894 // Write entry info 1895 int dataOffset = ifdOffsets[hint] + 2 + mAttributes[hint].size() * 12 + 4; 1896 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 1897 // Convert tag name to tag number. 1898 int tagNumber = (int) sExifTagMapsForWriting[hint].get(entry.getKey()); 1899 String entryValue = (String) entry.getValue(); 1900 1901 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1902 int numberOfComponents = getNumberOfComponentsInExifEntryValue(dataFormat, 1903 entryValue); 1904 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 1905 1906 dataOutputStream.writeUnsignedShort(tagNumber); 1907 dataOutputStream.writeUnsignedShort(dataFormat); 1908 dataOutputStream.writeInt(numberOfComponents); 1909 if (byteCount > 4) { 1910 dataOutputStream.writeUnsignedInt(dataOffset); 1911 dataOffset += byteCount; 1912 } else { 1913 int bytesWritten = writeExifEntryValue(dataOutputStream, entryValue); 1914 // Fill zero up to 4 bytes 1915 if (bytesWritten < 4) { 1916 for (int i = bytesWritten; i < 4; ++i) { 1917 dataOutputStream.write(0); 1918 } 1919 } 1920 } 1921 } 1922 1923 // Write the next offset. It writes the offset of thumbnail IFD if there is one or 1924 // more tags in the thumbnail IFD when the current IFD is the primary image TIFF 1925 // IFD; Otherwise 0. 1926 if (hint == 0 && !mAttributes[IFD_THUMBNAIL_HINT].isEmpty()) { 1927 dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_THUMBNAIL_HINT]); 1928 } else { 1929 dataOutputStream.writeUnsignedInt(0); 1930 } 1931 1932 // Write values of data field exceeding 4 bytes after the next offset. 1933 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 1934 String entryValue = (String) entry.getValue(); 1935 1936 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1937 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 1938 if (byteCount > 4) { 1939 writeExifEntryValue(dataOutputStream, entryValue); 1940 } 1941 } 1942 } 1943 } 1944 1945 // Write thumbnail 1946 if (mHasThumbnail) { 1947 dataOutputStream.write(getThumbnail()); 1948 } 1949 1950 return totalSize; 1951 } 1952 1953 // Writes EXIF entry value and its entry value type will be automatically determined. 1954 private static int writeExifEntryValue(ExifDataOutputStream dataOutputStream, String entryValue) 1955 throws IOException { 1956 int bytesWritten = 0; 1957 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1958 1959 // Values can be composed of several components. Each component is separated by char ','. 1960 String[] components = entryValue.split(","); 1961 for (String component : components) { 1962 switch (dataFormat) { 1963 case IFD_FORMAT_SLONG: 1964 dataOutputStream.writeInt(Integer.parseInt(component)); 1965 bytesWritten += 4; 1966 break; 1967 case IFD_FORMAT_DOUBLE: 1968 dataOutputStream.writeDouble(Double.parseDouble(component)); 1969 bytesWritten += 8; 1970 break; 1971 case IFD_FORMAT_STRING: 1972 byte[] asciiArray = (component + '\0').getBytes(Charset.forName("US-ASCII")); 1973 dataOutputStream.write(asciiArray); 1974 bytesWritten += asciiArray.length; 1975 break; 1976 case IFD_FORMAT_SRATIONAL: 1977 String[] rationalNumber = component.split("/"); 1978 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[0])); 1979 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[1])); 1980 bytesWritten += 8; 1981 break; 1982 default: 1983 throw new IllegalArgumentException(); 1984 } 1985 } 1986 return bytesWritten; 1987 } 1988 1989 // Determines the data format of EXIF entry value. 1990 private static int getDataFormatOfExifEntryValue(String entryValue) { 1991 // See TIFF 6.0 spec Types. page 15. 1992 // Take the first component if there are more than one component. 1993 if (entryValue.contains(",")) { 1994 entryValue = entryValue.split(",")[0]; 1995 } 1996 1997 if (entryValue.contains("/")) { 1998 return IFD_FORMAT_SRATIONAL; 1999 } 2000 try { 2001 Integer.parseInt(entryValue); 2002 return IFD_FORMAT_SLONG; 2003 } catch (NumberFormatException e) { 2004 // Ignored 2005 } 2006 try { 2007 Double.parseDouble(entryValue); 2008 return IFD_FORMAT_DOUBLE; 2009 } catch (NumberFormatException e) { 2010 // Ignored 2011 } 2012 return IFD_FORMAT_STRING; 2013 } 2014 2015 // Determines the size of EXIF entry value. 2016 private static int getSizeOfExifEntryValue(int dataFormat, String entryValue) { 2017 // See TIFF 6.0 spec Types page 15. 2018 int bytesEstimated = 0; 2019 String[] components = entryValue.split(","); 2020 for (String component : components) { 2021 switch (dataFormat) { 2022 case IFD_FORMAT_SLONG: 2023 bytesEstimated += 4; 2024 break; 2025 case IFD_FORMAT_DOUBLE: 2026 bytesEstimated += 8; 2027 break; 2028 case IFD_FORMAT_STRING: 2029 bytesEstimated 2030 += (component + '\0').getBytes(Charset.forName("US-ASCII")).length; 2031 break; 2032 case IFD_FORMAT_SRATIONAL: 2033 bytesEstimated += 8; 2034 break; 2035 default: 2036 throw new IllegalArgumentException(); 2037 } 2038 } 2039 return bytesEstimated; 2040 } 2041 2042 // Determines the number of components of EXIF entry value. 2043 private static int getNumberOfComponentsInExifEntryValue(int dataFormat, String entryValue) { 2044 if (dataFormat == IFD_FORMAT_STRING) { 2045 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2046 } 2047 int count = 1; 2048 for (int i = 0; i < entryValue.length(); ++i) { 2049 if (entryValue.charAt(i) == ',') { 2050 ++count; 2051 } 2052 } 2053 return count; 2054 } 2055 2056 // An input stream to parse EXIF data area, which can be written in either little or big endian 2057 // order. 2058 private static class ByteOrderAwarenessDataInputStream extends ByteArrayInputStream { 2059 private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN; 2060 private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN; 2061 2062 private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN; 2063 private final long mLength; 2064 private long mPosition; 2065 2066 public ByteOrderAwarenessDataInputStream(byte[] bytes) { 2067 super(bytes); 2068 mLength = bytes.length; 2069 mPosition = 0L; 2070 } 2071 2072 public void setByteOrder(ByteOrder byteOrder) { 2073 mByteOrder = byteOrder; 2074 } 2075 2076 public void seek(long byteCount) throws IOException { 2077 mPosition = 0L; 2078 reset(); 2079 if (skip(byteCount) != byteCount) 2080 throw new IOException("Couldn't seek up to the byteCount"); 2081 } 2082 2083 public long peek() { 2084 return mPosition; 2085 } 2086 2087 public void readFully(byte[] buffer) throws IOException { 2088 mPosition += buffer.length; 2089 if (mPosition > mLength) 2090 throw new EOFException(); 2091 if (super.read(buffer, 0, buffer.length) != buffer.length) { 2092 throw new IOException("Couldn't read up to the length of buffer"); 2093 } 2094 } 2095 2096 public byte readByte() throws IOException { 2097 ++mPosition; 2098 if (mPosition > mLength) 2099 throw new EOFException(); 2100 int ch = super.read(); 2101 if (ch < 0) 2102 throw new EOFException(); 2103 return (byte) ch; 2104 } 2105 2106 public short readShort() throws IOException { 2107 mPosition += 2; 2108 if (mPosition > mLength) 2109 throw new EOFException(); 2110 int ch1 = super.read(); 2111 int ch2 = super.read(); 2112 if ((ch1 | ch2) < 0) 2113 throw new EOFException(); 2114 if (mByteOrder == LITTLE_ENDIAN) { 2115 return (short) ((ch2 << 8) + (ch1)); 2116 } else if (mByteOrder == BIG_ENDIAN) { 2117 return (short) ((ch1 << 8) + (ch2)); 2118 } 2119 throw new IOException("Invalid byte order: " + mByteOrder); 2120 } 2121 2122 public int readInt() throws IOException { 2123 mPosition += 4; 2124 if (mPosition > mLength) 2125 throw new EOFException(); 2126 int ch1 = super.read(); 2127 int ch2 = super.read(); 2128 int ch3 = super.read(); 2129 int ch4 = super.read(); 2130 if ((ch1 | ch2 | ch3 | ch4) < 0) 2131 throw new EOFException(); 2132 if (mByteOrder == LITTLE_ENDIAN) { 2133 return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1); 2134 } else if (mByteOrder == BIG_ENDIAN) { 2135 return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4); 2136 } 2137 throw new IOException("Invalid byte order: " + mByteOrder); 2138 } 2139 2140 @Override 2141 public long skip(long byteCount) { 2142 long skipped = super.skip(Math.min(byteCount, mLength - mPosition)); 2143 mPosition += skipped; 2144 return skipped; 2145 } 2146 2147 public int readUnsignedShort() throws IOException { 2148 mPosition += 2; 2149 if (mPosition > mLength) 2150 throw new EOFException(); 2151 int ch1 = super.read(); 2152 int ch2 = super.read(); 2153 if ((ch1 | ch2) < 0) 2154 throw new EOFException(); 2155 if (mByteOrder == LITTLE_ENDIAN) { 2156 return ((ch2 << 8) + (ch1)); 2157 } else if (mByteOrder == BIG_ENDIAN) { 2158 return ((ch1 << 8) + (ch2)); 2159 } 2160 throw new IOException("Invalid byte order: " + mByteOrder); 2161 } 2162 2163 public long readUnsignedInt() throws IOException { 2164 return readInt() & 0xffffffffL; 2165 } 2166 2167 public long readLong() throws IOException { 2168 mPosition += 8; 2169 if (mPosition > mLength) 2170 throw new EOFException(); 2171 int ch1 = super.read(); 2172 int ch2 = super.read(); 2173 int ch3 = super.read(); 2174 int ch4 = super.read(); 2175 int ch5 = super.read(); 2176 int ch6 = super.read(); 2177 int ch7 = super.read(); 2178 int ch8 = super.read(); 2179 if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) 2180 throw new EOFException(); 2181 if (mByteOrder == LITTLE_ENDIAN) { 2182 return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40) 2183 + ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16) 2184 + ((long) ch2 << 8) + (long) ch1); 2185 } else if (mByteOrder == BIG_ENDIAN) { 2186 return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40) 2187 + ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16) 2188 + ((long) ch7 << 8) + (long) ch8); 2189 } 2190 throw new IOException("Invalid byte order: " + mByteOrder); 2191 } 2192 2193 public float readFloat() throws IOException { 2194 return Float.intBitsToFloat(readInt()); 2195 } 2196 2197 public double readDouble() throws IOException { 2198 return Double.longBitsToDouble(readLong()); 2199 } 2200 } 2201 2202 // An output stream to write EXIF data area, that will be written in big endian byte order. 2203 private static class ExifDataOutputStream extends DataOutputStream { 2204 public ExifDataOutputStream(OutputStream out) { 2205 super(out); 2206 } 2207 2208 public void writeUnsignedShort(int val) throws IOException { 2209 writeShort((short) val); 2210 } 2211 2212 public void writeUnsignedInt(long val) throws IOException { 2213 writeInt((int) val); 2214 } 2215 } 2216 2217 // JNI methods for RAW formats. 2218 private static native void nativeInitRaw(); 2219 private static native byte[] nativeGetThumbnailFromAsset( 2220 long asset, int thumbnailOffset, int thumbnailLength); 2221 private static native HashMap nativeGetRawAttributesFromAsset(long asset); 2222 private static native HashMap nativeGetRawAttributesFromFileDescriptor(FileDescriptor fd); 2223 private static native HashMap nativeGetRawAttributesFromInputStream(InputStream in); 2224} 2225