ExifInterface.java revision f2a1076cd3d8fa1e5e6b9ced4380860e720675f7
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 boolean mIsRaw; 655 private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length]; 656 private boolean mHasThumbnail; 657 // The following values used for indicating a thumbnail position. 658 private int mThumbnailOffset; 659 private int mThumbnailLength; 660 private byte[] mThumbnailBytes; 661 662 // Pattern to check non zero timestamp 663 private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*"); 664 665 /** 666 * Reads Exif tags from the specified image file. 667 */ 668 public ExifInterface(String filename) throws IOException { 669 if (filename == null) { 670 throw new IllegalArgumentException("filename cannot be null"); 671 } 672 FileInputStream in = new FileInputStream(filename); 673 mAssetInputStream = null; 674 mFilename = filename; 675 if (isSeekableFD(in.getFD())) { 676 mSeekableFileDescriptor = in.getFD(); 677 } else { 678 mSeekableFileDescriptor = null; 679 } 680 loadAttributes(in); 681 } 682 683 /** 684 * Reads Exif tags from the specified image file descriptor. Attribute mutation is supported 685 * for seekable file descriptors only. 686 */ 687 public ExifInterface(FileDescriptor fileDescriptor) throws IOException { 688 if (fileDescriptor == null) { 689 throw new IllegalArgumentException("parcelFileDescriptor cannot be null"); 690 } 691 mAssetInputStream = null; 692 mFilename = null; 693 if (isSeekableFD(fileDescriptor)) { 694 mSeekableFileDescriptor = fileDescriptor; 695 } else { 696 mSeekableFileDescriptor = null; 697 } 698 loadAttributes(new FileInputStream(fileDescriptor)); 699 } 700 701 /** 702 * Reads Exif tags from the specified image input stream. Attribute mutation is not supported 703 * for input streams. 704 */ 705 public ExifInterface(InputStream inputStream) throws IOException { 706 if (inputStream == null) { 707 throw new IllegalArgumentException("inputStream cannot be null"); 708 } 709 mFilename = null; 710 if (inputStream instanceof AssetManager.AssetInputStream) { 711 mAssetInputStream = (AssetManager.AssetInputStream) inputStream; 712 mSeekableFileDescriptor = null; 713 } else if (inputStream instanceof FileInputStream 714 && isSeekableFD(((FileInputStream) inputStream).getFD())) { 715 mAssetInputStream = null; 716 mSeekableFileDescriptor = ((FileInputStream) inputStream).getFD(); 717 } else { 718 mAssetInputStream = null; 719 mSeekableFileDescriptor = null; 720 } 721 loadAttributes(inputStream); 722 } 723 724 /** 725 * Returns the value of the specified tag or {@code null} if there 726 * is no such tag in the image file. 727 * 728 * @param tag the name of the tag. 729 */ 730 public String getAttribute(String tag) { 731 // Retrieves all tag groups. The value from primary image tag group has a higher priority 732 // than the value from the thumbnail tag group if there are more than one candidates. 733 for (int i = 0; i < EXIF_TAGS.length; ++i) { 734 Object value = mAttributes[i].get(tag); 735 if (value != null) { 736 return (String) value; 737 } 738 } 739 return null; 740 } 741 742 /** 743 * Returns the integer value of the specified tag. If there is no such tag 744 * in the image file or the value cannot be parsed as integer, return 745 * <var>defaultValue</var>. 746 * 747 * @param tag the name of the tag. 748 * @param defaultValue the value to return if the tag is not available. 749 */ 750 public int getAttributeInt(String tag, int defaultValue) { 751 String value = getAttribute(tag); 752 if (value == null) return defaultValue; 753 try { 754 return Integer.valueOf(value); 755 } catch (NumberFormatException e) { 756 return defaultValue; 757 } 758 } 759 760 /** 761 * Returns the double value of the tag that is specified as rational or contains a 762 * double-formatted value. If there is no such tag in the image file or the value cannot be 763 * parsed as double, return <var>defaultValue</var>. 764 * 765 * @param tag the name of the tag. 766 * @param defaultValue the value to return if the tag is not available. 767 */ 768 public double getAttributeDouble(String tag, double defaultValue) { 769 String value = getAttribute(tag); 770 if (value == null) return defaultValue; 771 try { 772 int index = value.indexOf("/"); 773 if (index == -1) return Double.parseDouble(value); 774 double denom = Double.parseDouble(value.substring(index + 1)); 775 if (denom == 0) return defaultValue; 776 double num = Double.parseDouble(value.substring(0, index)); 777 return num / denom; 778 } catch (NumberFormatException e) { 779 return defaultValue; 780 } 781 } 782 783 /** 784 * Set the value of the specified tag. 785 * 786 * @param tag the name of the tag. 787 * @param value the value of the tag. 788 */ 789 public void setAttribute(String tag, String value) { 790 for (int i = 0 ; i < EXIF_TAGS.length; ++i) { 791 if (sExifTagMapsForWriting[i].containsKey(tag)) { 792 mAttributes[i].put(tag, value); 793 } 794 } 795 } 796 797 /** 798 * This function decides which parser to read the image data according to the given input stream 799 * type and the content of the input stream. In each case, it reads the first three bytes to 800 * determine whether the image data format is JPEG or not. 801 */ 802 private void loadAttributes(@NonNull InputStream in) throws IOException { 803 // Initialize mAttributes. 804 for (int i = 0; i < EXIF_TAGS.length; ++i) { 805 mAttributes[i] = new HashMap(); 806 } 807 808 // Process RAW input stream 809 if (mAssetInputStream != null) { 810 long asset = mAssetInputStream.getNativeAsset(); 811 if (handleRawResult(nativeGetRawAttributesFromAsset(asset))) { 812 return; 813 } 814 } else if (mSeekableFileDescriptor != null) { 815 if (handleRawResult(nativeGetRawAttributesFromFileDescriptor( 816 mSeekableFileDescriptor))) { 817 return; 818 } 819 } else { 820 in = new BufferedInputStream(in, JPEG_SIGNATURE_SIZE); 821 if (!isJpegInputStream((BufferedInputStream) in) && handleRawResult( 822 nativeGetRawAttributesFromInputStream(in))) { 823 return; 824 } 825 } 826 827 // Process JPEG input stream 828 try { 829 getJpegAttributes(in); 830 } catch (IOException e) { 831 // Ignore exceptions in order to keep the compatibility with the old versions of 832 // ExifInterface. 833 Log.w(TAG, "Invalid JPEG", e); 834 } 835 836 if (DEBUG) { 837 printAttributes(); 838 } 839 } 840 841 private static boolean isJpegInputStream(BufferedInputStream in) throws IOException { 842 in.mark(JPEG_SIGNATURE_SIZE); 843 byte[] signatureBytes = new byte[JPEG_SIGNATURE_SIZE]; 844 if (in.read(signatureBytes) != JPEG_SIGNATURE_SIZE) { 845 throw new EOFException(); 846 } 847 boolean isJpeg = Arrays.equals(JPEG_SIGNATURE, signatureBytes); 848 in.reset(); 849 return isJpeg; 850 } 851 852 private boolean handleRawResult(HashMap map) { 853 if (map == null) { 854 return false; 855 } 856 857 // Mark for disabling the save feature. 858 mIsRaw = true; 859 860 for (Map.Entry entry : (Set<Map.Entry>) map.entrySet()) { 861 String attrName = (String) entry.getKey(); 862 863 switch (attrName) { 864 case TAG_HAS_THUMBNAIL: 865 mHasThumbnail = ((String) entry.getValue()).equalsIgnoreCase("true"); 866 break; 867 case TAG_THUMBNAIL_OFFSET: 868 mThumbnailOffset = Integer.parseInt((String) entry.getValue()); 869 break; 870 case TAG_THUMBNAIL_LENGTH: 871 mThumbnailLength = Integer.parseInt((String) entry.getValue()); 872 break; 873 case TAG_THUMBNAIL_DATA: 874 mThumbnailBytes = (byte[]) entry.getValue(); 875 break; 876 default: 877 setAttribute(attrName, (String) entry.getValue()); 878 break; 879 } 880 } 881 882 if (DEBUG) { 883 printAttributes(); 884 } 885 return true; 886 } 887 888 private static boolean isSeekableFD(FileDescriptor fd) throws IOException { 889 try { 890 Os.lseek(fd, 0, OsConstants.SEEK_CUR); 891 return true; 892 } catch (ErrnoException e) { 893 return false; 894 } 895 } 896 897 // Prints out attributes for debugging. 898 private void printAttributes() { 899 for (int i = 0; i < mAttributes.length; ++i) { 900 Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size()); 901 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 902 Log.d(TAG, "tagName: " + entry.getKey() + ", tagValue: " + entry.getValue()); 903 } 904 } 905 } 906 907 /** 908 * Save the tag data into the original image file. This is expensive because it involves 909 * copying all the data from one file to another and deleting the old file and renaming the 910 * other. It's best to use{@link #setAttribute(String,String)} to set all attributes to write 911 * and make a single call rather than multiple calls for each attribute. 912 */ 913 public void saveAttributes() throws IOException { 914 if (mIsRaw) { 915 throw new UnsupportedOperationException( 916 "ExifInterface does not support saving attributes on RAW formats."); 917 } 918 if (mSeekableFileDescriptor == null && mFilename == null) { 919 throw new UnsupportedOperationException( 920 "ExifInterface does not support saving attributes for the current input."); 921 } 922 923 // Keep the thumbnail in memory 924 mThumbnailBytes = getThumbnail(); 925 926 FileInputStream in = null; 927 FileOutputStream out = null; 928 File tempFile = null; 929 try { 930 // Move the original file to temporary file. 931 if (mFilename != null) { 932 tempFile = new File(mFilename + ".tmp"); 933 File originalFile = new File(mFilename); 934 if (!originalFile.renameTo(tempFile)) { 935 throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath()); 936 } 937 } else if (mSeekableFileDescriptor != null) { 938 tempFile = File.createTempFile("temp", "jpg"); 939 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 940 in = new FileInputStream(mSeekableFileDescriptor); 941 out = new FileOutputStream(tempFile); 942 Streams.copy(in, out); 943 } 944 } catch (ErrnoException e) { 945 e.rethrowAsIOException(); 946 } finally { 947 IoUtils.closeQuietly(in); 948 IoUtils.closeQuietly(out); 949 } 950 951 in = null; 952 out = null; 953 try { 954 // Save the new file. 955 in = new FileInputStream(tempFile); 956 if (mFilename != null) { 957 out = new FileOutputStream(mFilename); 958 } else if (mSeekableFileDescriptor != null) { 959 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 960 out = new FileOutputStream(mSeekableFileDescriptor); 961 } 962 saveJpegAttributes(in, out); 963 } catch (ErrnoException e) { 964 e.rethrowAsIOException(); 965 } finally { 966 IoUtils.closeQuietly(in); 967 IoUtils.closeQuietly(out); 968 tempFile.delete(); 969 } 970 971 // Discard the thumbnail in memory 972 mThumbnailBytes = null; 973 } 974 975 /** 976 * Returns true if the image file has a thumbnail. 977 */ 978 public boolean hasThumbnail() { 979 return mHasThumbnail; 980 } 981 982 /** 983 * Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail. 984 * The returned data is in JPEG format and can be decoded using 985 * {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)} 986 */ 987 public byte[] getThumbnail() { 988 if (!mHasThumbnail) { 989 return null; 990 } 991 if (mThumbnailBytes != null) { 992 return mThumbnailBytes; 993 } 994 995 // Read the thumbnail. 996 FileInputStream in = null; 997 try { 998 if (mAssetInputStream != null) { 999 return nativeGetThumbnailFromAsset( 1000 mAssetInputStream.getNativeAsset(), mThumbnailOffset, mThumbnailLength); 1001 } else if (mFilename != null) { 1002 in = new FileInputStream(mFilename); 1003 } else if (mSeekableFileDescriptor != null) { 1004 Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET); 1005 in = new FileInputStream(mSeekableFileDescriptor); 1006 } 1007 if (in == null) { 1008 // Should not be reached this. 1009 throw new FileNotFoundException(); 1010 } 1011 if (in.skip(mThumbnailOffset) != mThumbnailOffset) { 1012 throw new IOException("Corrupted image"); 1013 } 1014 byte[] buffer = new byte[mThumbnailLength]; 1015 if (in.read(buffer) != mThumbnailLength) { 1016 throw new IOException("Corrupted image"); 1017 } 1018 return buffer; 1019 } catch (IOException | ErrnoException e) { 1020 // Couldn't get a thumbnail image. 1021 } finally { 1022 IoUtils.closeQuietly(in); 1023 } 1024 return null; 1025 } 1026 1027 /** 1028 * Returns the offset and length of thumbnail inside the image file, or 1029 * {@code null} if there is no thumbnail. 1030 * 1031 * @return two-element array, the offset in the first value, and length in 1032 * the second, or {@code null} if no thumbnail was found. 1033 * @hide 1034 */ 1035 public long[] getThumbnailRange() { 1036 long[] range = new long[2]; 1037 range[0] = mThumbnailOffset; 1038 range[1] = mThumbnailLength; 1039 return range; 1040 } 1041 1042 /** 1043 * Stores the latitude and longitude value in a float array. The first element is 1044 * the latitude, and the second element is the longitude. Returns false if the 1045 * Exif tags are not available. 1046 */ 1047 public boolean getLatLong(float output[]) { 1048 String latValue = getAttribute(TAG_GPS_LATITUDE); 1049 String latRef = getAttribute(TAG_GPS_LATITUDE_REF); 1050 String lngValue = getAttribute(TAG_GPS_LONGITUDE); 1051 String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF); 1052 1053 if (latValue != null && latRef != null && lngValue != null && lngRef != null) { 1054 try { 1055 output[0] = convertRationalLatLonToFloat(latValue, latRef); 1056 output[1] = convertRationalLatLonToFloat(lngValue, lngRef); 1057 return true; 1058 } catch (IllegalArgumentException e) { 1059 // if values are not parseable 1060 } 1061 } 1062 1063 return false; 1064 } 1065 1066 /** 1067 * Return the altitude in meters. If the exif tag does not exist, return 1068 * <var>defaultValue</var>. 1069 * 1070 * @param defaultValue the value to return if the tag is not available. 1071 */ 1072 public double getAltitude(double defaultValue) { 1073 double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1); 1074 int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1); 1075 1076 if (altitude >= 0 && ref >= 0) { 1077 return (altitude * ((ref == 1) ? -1 : 1)); 1078 } else { 1079 return defaultValue; 1080 } 1081 } 1082 1083 /** 1084 * Returns number of milliseconds since Jan. 1, 1970, midnight local time. 1085 * Returns -1 if the date time information if not available. 1086 * @hide 1087 */ 1088 public long getDateTime() { 1089 String dateTimeString = getAttribute(TAG_DATETIME); 1090 if (dateTimeString == null 1091 || !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1; 1092 1093 ParsePosition pos = new ParsePosition(0); 1094 try { 1095 // The exif field is in local time. Parsing it as if it is UTC will yield time 1096 // since 1/1/1970 local time 1097 Date datetime = sFormatter.parse(dateTimeString, pos); 1098 if (datetime == null) return -1; 1099 long msecs = datetime.getTime(); 1100 1101 String subSecs = getAttribute(TAG_SUBSECTIME); 1102 if (subSecs != null) { 1103 try { 1104 long sub = Long.valueOf(subSecs); 1105 while (sub > 1000) { 1106 sub /= 10; 1107 } 1108 msecs += sub; 1109 } catch (NumberFormatException e) { 1110 // Ignored 1111 } 1112 } 1113 return msecs; 1114 } catch (IllegalArgumentException e) { 1115 return -1; 1116 } 1117 } 1118 1119 /** 1120 * Returns number of milliseconds since Jan. 1, 1970, midnight UTC. 1121 * Returns -1 if the date time information if not available. 1122 * @hide 1123 */ 1124 public long getGpsDateTime() { 1125 String date = getAttribute(TAG_GPS_DATESTAMP); 1126 String time = getAttribute(TAG_GPS_TIMESTAMP); 1127 if (date == null || time == null 1128 || (!sNonZeroTimePattern.matcher(date).matches() 1129 && !sNonZeroTimePattern.matcher(time).matches())) { 1130 return -1; 1131 } 1132 1133 String dateTimeString = date + ' ' + time; 1134 1135 ParsePosition pos = new ParsePosition(0); 1136 try { 1137 Date datetime = sFormatter.parse(dateTimeString, pos); 1138 if (datetime == null) return -1; 1139 return datetime.getTime(); 1140 } catch (IllegalArgumentException e) { 1141 return -1; 1142 } 1143 } 1144 1145 private static float convertRationalLatLonToFloat(String rationalString, String ref) { 1146 try { 1147 String [] parts = rationalString.split(","); 1148 1149 String [] pair; 1150 pair = parts[0].split("/"); 1151 double degrees = Double.parseDouble(pair[0].trim()) 1152 / Double.parseDouble(pair[1].trim()); 1153 1154 pair = parts[1].split("/"); 1155 double minutes = Double.parseDouble(pair[0].trim()) 1156 / Double.parseDouble(pair[1].trim()); 1157 1158 pair = parts[2].split("/"); 1159 double seconds = Double.parseDouble(pair[0].trim()) 1160 / Double.parseDouble(pair[1].trim()); 1161 1162 double result = degrees + (minutes / 60.0) + (seconds / 3600.0); 1163 if ((ref.equals("S") || ref.equals("W"))) { 1164 return (float) -result; 1165 } 1166 return (float) result; 1167 } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) { 1168 // Not valid 1169 throw new IllegalArgumentException(); 1170 } 1171 } 1172 1173 // Loads EXIF attributes from a JPEG input stream. 1174 private void getJpegAttributes(InputStream inputStream) throws IOException { 1175 // See JPEG File Interchange Format Specification page 5. 1176 if (DEBUG) { 1177 Log.d(TAG, "getJpegAttributes starting with: " + inputStream); 1178 } 1179 DataInputStream dataInputStream = new DataInputStream(inputStream); 1180 byte marker; 1181 int bytesRead = 0; 1182 if ((marker = dataInputStream.readByte()) != MARKER) { 1183 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1184 } 1185 ++bytesRead; 1186 if (dataInputStream.readByte() != MARKER_SOI) { 1187 throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff)); 1188 } 1189 ++bytesRead; 1190 while (true) { 1191 marker = dataInputStream.readByte(); 1192 if (marker != MARKER) { 1193 throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff)); 1194 } 1195 ++bytesRead; 1196 marker = dataInputStream.readByte(); 1197 if (DEBUG) { 1198 Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff)); 1199 } 1200 ++bytesRead; 1201 1202 // EOI indicates the end of an image and in case of SOS, JPEG image stream starts and 1203 // the image data will terminate right after. 1204 if (marker == MARKER_EOI || marker == MARKER_SOS) { 1205 break; 1206 } 1207 int length = dataInputStream.readUnsignedShort() - 2; 1208 bytesRead += 2; 1209 if (DEBUG) { 1210 Log.d(TAG, "JPEG segment: " + marker + " (length: " + (length + 2) + ")"); 1211 } 1212 if (length < 0) { 1213 throw new IOException("Invalid length"); 1214 } 1215 switch (marker) { 1216 case MARKER_APP1: { 1217 if (DEBUG) { 1218 Log.d(TAG, "MARKER_APP1"); 1219 } 1220 if (length < 6) { 1221 // Skip if it's not an EXIF APP1 segment. 1222 break; 1223 } 1224 byte[] identifier = new byte[6]; 1225 if (inputStream.read(identifier) != 6) { 1226 throw new IOException("Invalid exif"); 1227 } 1228 bytesRead += 6; 1229 length -= 6; 1230 if (!Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1231 // Skip if it's not an EXIF APP1 segment. 1232 break; 1233 } 1234 if (length <= 0) { 1235 throw new IOException("Invalid exif"); 1236 } 1237 if (DEBUG) { 1238 Log.d(TAG, "readExifSegment with a byte array (length: " + length + ")"); 1239 } 1240 byte[] bytes = new byte[length]; 1241 if (dataInputStream.read(bytes) != length) { 1242 throw new IOException("Invalid exif"); 1243 } 1244 readExifSegment(bytes, bytesRead); 1245 bytesRead += length; 1246 length = 0; 1247 break; 1248 } 1249 1250 case MARKER_COM: { 1251 byte[] bytes = new byte[length]; 1252 if (dataInputStream.read(bytes) != length) { 1253 throw new IOException("Invalid exif"); 1254 } 1255 length = 0; 1256 setAttribute("UserComment", new String(bytes, Charset.forName("US-ASCII"))); 1257 break; 1258 } 1259 1260 case MARKER_SOF0: 1261 case MARKER_SOF1: 1262 case MARKER_SOF2: 1263 case MARKER_SOF3: 1264 case MARKER_SOF5: 1265 case MARKER_SOF6: 1266 case MARKER_SOF7: 1267 case MARKER_SOF9: 1268 case MARKER_SOF10: 1269 case MARKER_SOF11: 1270 case MARKER_SOF13: 1271 case MARKER_SOF14: 1272 case MARKER_SOF15: { 1273 dataInputStream.skipBytes(1); 1274 setAttribute("ImageLength", 1275 String.valueOf(dataInputStream.readUnsignedShort())); 1276 setAttribute("ImageWidth", String.valueOf(dataInputStream.readUnsignedShort())); 1277 length -= 5; 1278 break; 1279 } 1280 1281 default: { 1282 break; 1283 } 1284 } 1285 if (length < 0) { 1286 throw new IOException("Invalid length"); 1287 } 1288 dataInputStream.skipBytes(length); 1289 bytesRead += length; 1290 } 1291 } 1292 1293 // Stores a new JPEG image with EXIF attributes into a given output stream. 1294 private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream) 1295 throws IOException { 1296 // See JPEG File Interchange Format Specification page 5. 1297 if (DEBUG) { 1298 Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream 1299 + ", outputStream: " + outputStream + ")"); 1300 } 1301 DataInputStream dataInputStream = new DataInputStream(inputStream); 1302 ExifDataOutputStream dataOutputStream = new ExifDataOutputStream(outputStream); 1303 if (dataInputStream.readByte() != MARKER) { 1304 throw new IOException("Invalid marker"); 1305 } 1306 dataOutputStream.writeByte(MARKER); 1307 if (dataInputStream.readByte() != MARKER_SOI) { 1308 throw new IOException("Invalid marker"); 1309 } 1310 dataOutputStream.writeByte(MARKER_SOI); 1311 1312 // Write EXIF APP1 segment 1313 dataOutputStream.writeByte(MARKER); 1314 dataOutputStream.writeByte(MARKER_APP1); 1315 writeExifSegment(dataOutputStream, 6); 1316 1317 byte[] bytes = new byte[4096]; 1318 1319 while (true) { 1320 if (dataInputStream.readByte() != MARKER) { 1321 throw new IOException("Invalid marker"); 1322 } 1323 byte marker = dataInputStream.readByte(); 1324 switch (marker) { 1325 case MARKER_APP1: { 1326 int length = dataInputStream.readUnsignedShort() - 2; 1327 if (length < 0) { 1328 throw new IOException("Invalid length"); 1329 } 1330 byte[] identifier = new byte[6]; 1331 if (length >= 6) { 1332 if (dataInputStream.read(identifier) != 6) { 1333 throw new IOException("Invalid exif"); 1334 } 1335 if (Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) { 1336 // Skip the original EXIF APP1 segment. 1337 if (dataInputStream.skip(length - 6) != length - 6) { 1338 throw new IOException("Invalid length"); 1339 } 1340 break; 1341 } 1342 } 1343 // Copy non-EXIF APP1 segment. 1344 dataOutputStream.writeUnsignedShort(length + 2); 1345 if (length >= 6) { 1346 length -= 6; 1347 dataOutputStream.write(identifier); 1348 } 1349 int read; 1350 while (length > 0 && (read = dataInputStream.read( 1351 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1352 dataOutputStream.write(bytes, 0, read); 1353 length -= read; 1354 } 1355 break; 1356 } 1357 case MARKER_EOI: 1358 case MARKER_SOS: { 1359 dataOutputStream.writeByte(MARKER); 1360 dataOutputStream.writeByte(marker); 1361 // Copy all the remaining data 1362 Streams.copy(dataInputStream, dataOutputStream); 1363 return; 1364 } 1365 default: { 1366 // Copy JPEG segment 1367 dataOutputStream.writeByte(MARKER); 1368 dataOutputStream.writeByte(marker); 1369 int length = dataInputStream.readUnsignedShort(); 1370 dataOutputStream.writeUnsignedShort(length); 1371 length -= 2; 1372 if (length < 0) { 1373 throw new IOException("Invalid length"); 1374 } 1375 int read; 1376 while (length > 0 && (read = dataInputStream.read( 1377 bytes, 0, Math.min(length, bytes.length))) >= 0) { 1378 dataOutputStream.write(bytes, 0, read); 1379 length -= read; 1380 } 1381 break; 1382 } 1383 } 1384 } 1385 } 1386 1387 // Reads the given EXIF byte area and save its tag data into attributes. 1388 private void readExifSegment(byte[] exifBytes, int exifOffsetFromBeginning) throws IOException { 1389 // Parse TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1390 ByteOrderAwarenessDataInputStream dataInputStream = 1391 new ByteOrderAwarenessDataInputStream(exifBytes); 1392 1393 // Read byte align 1394 short byteOrder = dataInputStream.readShort(); 1395 switch (byteOrder) { 1396 case BYTE_ALIGN_II: 1397 if (DEBUG) { 1398 Log.d(TAG, "readExifSegment: Byte Align II"); 1399 } 1400 dataInputStream.setByteOrder(ByteOrder.LITTLE_ENDIAN); 1401 break; 1402 case BYTE_ALIGN_MM: 1403 if (DEBUG) { 1404 Log.d(TAG, "readExifSegment: Byte Align MM"); 1405 } 1406 dataInputStream.setByteOrder(ByteOrder.BIG_ENDIAN); 1407 break; 1408 default: 1409 throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder)); 1410 } 1411 1412 int startCode = dataInputStream.readUnsignedShort(); 1413 if (startCode != 0x2a) { 1414 throw new IOException("Invalid exif start: " + Integer.toHexString(startCode)); 1415 } 1416 1417 // Read first ifd offset 1418 long firstIfdOffset = dataInputStream.readUnsignedInt(); 1419 if (firstIfdOffset < 8 || firstIfdOffset >= exifBytes.length) { 1420 throw new IOException("Invalid first Ifd offset: " + firstIfdOffset); 1421 } 1422 firstIfdOffset -= 8; 1423 if (firstIfdOffset > 0) { 1424 if (dataInputStream.skip(firstIfdOffset) != firstIfdOffset) { 1425 throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset); 1426 } 1427 } 1428 1429 // Read primary image TIFF image file directory. 1430 readImageFileDirectory(dataInputStream, IFD_TIFF_HINT); 1431 1432 // Process thumbnail. 1433 String jpegInterchangeFormatString = getAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name); 1434 String jpegInterchangeFormatLengthString = 1435 getAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name); 1436 if (jpegInterchangeFormatString != null && jpegInterchangeFormatLengthString != null) { 1437 try { 1438 int jpegInterchangeFormat = Integer.parseInt(jpegInterchangeFormatString); 1439 int jpegInterchangeFormatLength = Integer 1440 .parseInt(jpegInterchangeFormatLengthString); 1441 // The following code limits the size of thumbnail size not to overflow EXIF data area. 1442 jpegInterchangeFormatLength = Math.min(jpegInterchangeFormat 1443 + jpegInterchangeFormatLength, exifOffsetFromBeginning + exifBytes.length) 1444 - jpegInterchangeFormat; 1445 if (jpegInterchangeFormat > 0 && jpegInterchangeFormatLength > 0) { 1446 mHasThumbnail = true; 1447 mThumbnailOffset = exifOffsetFromBeginning + jpegInterchangeFormat; 1448 mThumbnailLength = jpegInterchangeFormatLength; 1449 1450 if (mFilename == null && mAssetInputStream == null 1451 && mSeekableFileDescriptor == null) { 1452 // Save the thumbnail in memory if the input doesn't support reading again. 1453 byte[] thumbnailBytes = new byte[jpegInterchangeFormatLength]; 1454 dataInputStream.seek(jpegInterchangeFormat); 1455 dataInputStream.readFully(thumbnailBytes); 1456 mThumbnailBytes = thumbnailBytes; 1457 1458 if (DEBUG) { 1459 Bitmap bitmap = BitmapFactory.decodeByteArray( 1460 thumbnailBytes, 0, thumbnailBytes.length); 1461 Log.d(TAG, "Thumbnail offset: " + mThumbnailOffset + ", length: " 1462 + mThumbnailLength + ", width: " + bitmap.getWidth() 1463 + ", height: " 1464 + bitmap.getHeight()); 1465 } 1466 } 1467 } 1468 } catch (NumberFormatException e) { 1469 // Ignored the corrupted image. 1470 } 1471 } 1472 1473 // For compatibility, keep data formats as follows. 1474 convertToInt(TAG_IMAGE_WIDTH); 1475 convertToInt(TAG_IMAGE_LENGTH); 1476 convertToInt(TAG_ORIENTATION); 1477 convertToInt(TAG_FLASH); 1478 convertToRational(TAG_FOCAL_LENGTH); 1479 convertToDouble(TAG_DIGITAL_ZOOM_RATIO); 1480 convertToDouble(TAG_EXPOSURE_TIME); 1481 convertToDouble(TAG_F_NUMBER); 1482 convertToDouble(TAG_SUBJECT_DISTANCE); 1483 convertToInt(TAG_ISO); 1484 convertToDouble(TAG_EXPOSURE_BIAS_VALUE); 1485 convertToInt(TAG_WHITE_BALANCE); 1486 convertToInt(TAG_LIGHT_SOURCE); 1487 convertToInt(TAG_METERING_MODE); 1488 convertToInt(TAG_EXPOSURE_PROGRAM); 1489 convertToInt(TAG_EXPOSURE_MODE); 1490 convertToRational(TAG_GPS_ALTITUDE); 1491 convertToInt(TAG_GPS_ALTITUDE_REF); 1492 convertToRational(TAG_GPS_LONGITUDE); 1493 convertToRational(TAG_GPS_LATITUDE); 1494 convertToTimetamp(TAG_GPS_TIMESTAMP); 1495 1496 // The value of DATETIME tag has the same value of DATETIME_ORIGINAL tag. 1497 String valueOfDateTimeOriginal = getAttribute("DateTimeOriginal"); 1498 if (valueOfDateTimeOriginal != null) { 1499 setAttribute(TAG_DATETIME, valueOfDateTimeOriginal); 1500 } 1501 1502 // Add the default value. 1503 if (getAttribute(TAG_IMAGE_WIDTH) == null) { 1504 setAttribute(TAG_IMAGE_WIDTH, "0"); 1505 } 1506 if (getAttribute(TAG_IMAGE_LENGTH) == null) { 1507 setAttribute(TAG_IMAGE_LENGTH, "0"); 1508 } 1509 if (getAttribute(TAG_ORIENTATION) == null) { 1510 setAttribute(TAG_ORIENTATION, "0"); 1511 } 1512 if (getAttribute(TAG_LIGHT_SOURCE) == null) { 1513 setAttribute(TAG_LIGHT_SOURCE, "0"); 1514 } 1515 } 1516 1517 // Converts the tag value to timestamp; Otherwise deletes the given tag. 1518 private void convertToTimetamp(String tagName) { 1519 String entryValue = getAttribute(tagName); 1520 if (entryValue == null) return; 1521 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1522 String[] components = entryValue.split(","); 1523 if (dataFormat == IFD_FORMAT_SRATIONAL && components.length == 3) { 1524 StringBuilder stringBuilder = new StringBuilder(); 1525 for (String component : components) { 1526 if (stringBuilder.length() > 0) { 1527 stringBuilder.append(":"); 1528 } 1529 String[] rationalNumber = component.split("/"); 1530 int numerator = Integer.parseInt(rationalNumber[0]); 1531 int denominator = Integer.parseInt(rationalNumber[1]); 1532 if (denominator == 0) { 1533 numerator = 0; 1534 denominator = 1; 1535 } 1536 int value = numerator / denominator; 1537 stringBuilder.append(String.format("%02d", value)); 1538 } 1539 setAttribute(tagName, stringBuilder.toString()); 1540 } else if (dataFormat != IFD_FORMAT_STRING) { 1541 setAttribute(tagName, null); 1542 } 1543 } 1544 1545 // Checks the tag value of a given tag formatted in double type; Otherwise try to convert it to 1546 // double type or delete it. 1547 private void convertToDouble(String tagName) { 1548 String entryValue = getAttribute(tagName); 1549 if (entryValue == null) return; 1550 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1551 switch (dataFormat) { 1552 case IFD_FORMAT_SRATIONAL: { 1553 StringBuilder stringBuilder = new StringBuilder(); 1554 String[] components = entryValue.split(","); 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 stringBuilder.append((double) numerator / denominator); 1567 } 1568 setAttribute(tagName, stringBuilder.toString()); 1569 break; 1570 } 1571 case IFD_FORMAT_DOUBLE: 1572 // Keep it as is. 1573 break; 1574 default: 1575 setAttribute(tagName, null); 1576 break; 1577 } 1578 } 1579 1580 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1581 private void convertToRational(String tagName) { 1582 String entryValue = getAttribute(tagName); 1583 if (entryValue == null) return; 1584 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1585 switch (dataFormat) { 1586 case IFD_FORMAT_SLONG: 1587 case IFD_FORMAT_DOUBLE: { 1588 StringBuilder stringBuilder = new StringBuilder(); 1589 String[] components = entryValue.split(","); 1590 for (String component : components) { 1591 if (stringBuilder.length() > 0) { 1592 stringBuilder.append(","); 1593 } 1594 double doubleValue = Double.parseDouble(component); 1595 stringBuilder.append((int) (doubleValue * 10000.0)).append("/").append(10000); 1596 } 1597 setAttribute(tagName, stringBuilder.toString()); 1598 break; 1599 } 1600 case IFD_FORMAT_SRATIONAL: 1601 // Keep it as is. 1602 break; 1603 default: 1604 setAttribute(tagName, null); 1605 break; 1606 } 1607 } 1608 1609 // Checks the tag value of a given tag formatted in int type; Otherwise deletes the tag value. 1610 private void convertToInt(String tagName) { 1611 String entryValue = getAttribute(tagName); 1612 if (entryValue == null) return; 1613 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1614 if (dataFormat != IFD_FORMAT_SLONG) { 1615 setAttribute(tagName, null); 1616 } 1617 } 1618 1619 // Reads image file directory, which is a tag group in EXIF. 1620 private void readImageFileDirectory(ByteOrderAwarenessDataInputStream dataInputStream, int hint) 1621 throws IOException { 1622 if (dataInputStream.peek() + 2 > dataInputStream.mLength) { 1623 // Return if there is no data from the offset. 1624 return; 1625 } 1626 // See JEITA CP-3451 Figure 5. page 9. 1627 short numberOfDirectoryEntry = dataInputStream.readShort(); 1628 if (dataInputStream.peek() + 12 * numberOfDirectoryEntry > dataInputStream.mLength) { 1629 // Return if the size of entries is too big. 1630 return; 1631 } 1632 1633 if (DEBUG) { 1634 Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry); 1635 } 1636 1637 for (short i = 0; i < numberOfDirectoryEntry; ++i) { 1638 int tagNumber = dataInputStream.readUnsignedShort(); 1639 int dataFormat = dataInputStream.readUnsignedShort(); 1640 int numberOfComponents = dataInputStream.readInt(); 1641 long nextEntryOffset = dataInputStream.peek() + 4; // next four bytes is for data 1642 // offset or value. 1643 // Look up a corresponding tag from tag number 1644 String tagName = (String) sExifTagMapsForReading[hint].get(tagNumber); 1645 1646 if (DEBUG) { 1647 Log.d(TAG, String.format("hint: %d, tagNumber: %d, tagName: %s, dataFormat: %d," + 1648 "numberOfComponents: %d", hint, tagNumber, tagName, dataFormat, 1649 numberOfComponents)); 1650 } 1651 1652 if (tagName == null || dataFormat <= 0 || 1653 dataFormat >= IFD_FORMAT_BYTES_PER_FORMAT.length) { 1654 // Skip if the parsed tag number is not defined or invalid data format. 1655 if (tagName == null) { 1656 Log.w(TAG, "Skip the tag entry since tag number is not defined: " + tagNumber); 1657 } else { 1658 Log.w(TAG, "Skip the tag entry since data format is invalid: " + dataFormat); 1659 } 1660 dataInputStream.seek(nextEntryOffset); 1661 continue; 1662 } 1663 1664 // Read a value from data field or seek to the value offset which is stored in data 1665 // field if the size of the entry value is bigger than 4. 1666 int byteCount = numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat]; 1667 if (byteCount > 4) { 1668 long offset = dataInputStream.readUnsignedInt(); 1669 if (DEBUG) { 1670 Log.d(TAG, "seek to data offset: " + offset); 1671 } 1672 if (offset + byteCount <= dataInputStream.mLength) { 1673 dataInputStream.seek(offset); 1674 } else { 1675 // Skip if invalid data offset. 1676 Log.w(TAG, "Skip the tag entry since data offset is invalid: " + offset); 1677 dataInputStream.seek(nextEntryOffset); 1678 continue; 1679 } 1680 } 1681 1682 // Recursively parse IFD when a IFD pointer tag appears. 1683 int innerIfdHint = getIfdHintFromTagNumber(tagNumber); 1684 if (DEBUG) { 1685 Log.d(TAG, "innerIfdHint: " + innerIfdHint + " byteCount: " + byteCount); 1686 } 1687 if (innerIfdHint >= 0) { 1688 long offset = -1L; 1689 // Get offset from data field 1690 switch (dataFormat) { 1691 case IFD_FORMAT_USHORT: { 1692 offset = dataInputStream.readUnsignedShort(); 1693 break; 1694 } 1695 case IFD_FORMAT_SSHORT: { 1696 offset = dataInputStream.readShort(); 1697 break; 1698 } 1699 case IFD_FORMAT_ULONG: { 1700 offset = dataInputStream.readUnsignedInt(); 1701 break; 1702 } 1703 case IFD_FORMAT_SLONG: { 1704 offset = dataInputStream.readInt(); 1705 break; 1706 } 1707 default: { 1708 // Nothing to do 1709 break; 1710 } 1711 } 1712 if (DEBUG) { 1713 Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tagName)); 1714 } 1715 if (offset > 0L && offset < dataInputStream.mLength) { 1716 dataInputStream.seek(offset); 1717 readImageFileDirectory(dataInputStream, innerIfdHint); 1718 } else { 1719 Log.w(TAG, "Skip jump into the IFD since its offset is invalid: " + offset); 1720 } 1721 1722 dataInputStream.seek(nextEntryOffset); 1723 continue; 1724 } 1725 1726 if (numberOfComponents == 1 || dataFormat == IFD_FORMAT_STRING 1727 || dataFormat == IFD_FORMAT_UNDEFINED) { 1728 String entryValue = readExifEntryValue( 1729 dataInputStream, dataFormat, numberOfComponents); 1730 if (entryValue != null) { 1731 setAttribute(tagName, entryValue); 1732 } 1733 } else { 1734 StringBuilder entryValueBuilder = new StringBuilder(); 1735 for (int c = 0; c < numberOfComponents; ++c) { 1736 if (entryValueBuilder.length() > 0) { 1737 entryValueBuilder.append(","); 1738 } 1739 entryValueBuilder.append(readExifEntryValue( 1740 dataInputStream, dataFormat, numberOfComponents)); 1741 } 1742 setAttribute(tagName, entryValueBuilder.toString()); 1743 } 1744 1745 if (dataInputStream.peek() != nextEntryOffset) { 1746 dataInputStream.seek(nextEntryOffset); 1747 } 1748 } 1749 1750 if (dataInputStream.peek() + 4 <= dataInputStream.mLength) { 1751 long nextIfdOffset = dataInputStream.readUnsignedInt(); 1752 if (DEBUG) { 1753 Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset)); 1754 } 1755 // The next IFD offset needs to be bigger than 8 1756 // since the first IFD offset is at least 8. 1757 if (nextIfdOffset > 8 && nextIfdOffset < dataInputStream.mLength) { 1758 dataInputStream.seek(nextIfdOffset); 1759 readImageFileDirectory(dataInputStream, IFD_THUMBNAIL_HINT); 1760 } 1761 } 1762 } 1763 1764 // Reads a value from where the entry value are stored. 1765 private String readExifEntryValue(ByteOrderAwarenessDataInputStream dataInputStream, 1766 int dataFormat, int numberOfComponents) throws IOException { 1767 // See TIFF 6.0 spec Types. page 15. 1768 switch (dataFormat) { 1769 case IFD_FORMAT_BYTE: { 1770 return String.valueOf(dataInputStream.readByte()); 1771 } 1772 case IFD_FORMAT_SBYTE: { 1773 return String.valueOf(dataInputStream.readByte() & 0xff); 1774 } 1775 case IFD_FORMAT_USHORT: { 1776 return String.valueOf(dataInputStream.readUnsignedShort()); 1777 } 1778 case IFD_FORMAT_SSHORT: { 1779 return String.valueOf(dataInputStream.readUnsignedInt()); 1780 } 1781 case IFD_FORMAT_ULONG: { 1782 return String.valueOf(dataInputStream.readInt()); 1783 } 1784 case IFD_FORMAT_SLONG: { 1785 return String.valueOf(dataInputStream.readInt()); 1786 } 1787 case IFD_FORMAT_URATIONAL: 1788 case IFD_FORMAT_SRATIONAL: { 1789 int numerator = dataInputStream.readInt(); 1790 int denominator = dataInputStream.readInt(); 1791 return numerator + "/" + denominator; 1792 } 1793 case IFD_FORMAT_SINGLE: { 1794 return String.valueOf(dataInputStream.readFloat()); 1795 } 1796 case IFD_FORMAT_DOUBLE: { 1797 return String.valueOf(dataInputStream.readDouble()); 1798 } 1799 case IFD_FORMAT_UNDEFINED: // Usually UNDEFINED format is ASCII. 1800 case IFD_FORMAT_STRING: { 1801 byte[] bytes = new byte[numberOfComponents]; 1802 dataInputStream.readFully(bytes); 1803 int index = 0; 1804 if (numberOfComponents >= EXIF_ASCII_PREFIX.length) { 1805 boolean same = true; 1806 for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) { 1807 if (bytes[i] != EXIF_ASCII_PREFIX[i]) { 1808 same = false; 1809 break; 1810 } 1811 } 1812 if (same) { 1813 index = EXIF_ASCII_PREFIX.length; 1814 } 1815 } 1816 1817 StringBuilder stringBuilder = new StringBuilder(); 1818 while (index < numberOfComponents) { 1819 int ch = bytes[index]; 1820 if (ch == 0) { 1821 break; 1822 } 1823 if (ch >= 32) { 1824 stringBuilder.append((char) ch); 1825 } 1826 else { 1827 stringBuilder.append('?'); 1828 } 1829 ++index; 1830 } 1831 return stringBuilder.toString(); 1832 } 1833 default: { 1834 // Nothing to do 1835 return null; 1836 } 1837 } 1838 } 1839 1840 // Gets the corresponding IFD group index of the given tag number for writing Exif Tags. 1841 private static int getIfdHintFromTagNumber(int tagNumber) { 1842 for (int i = 0; i < IFD_POINTER_TAG_HINTS.length; ++i) { 1843 if (IFD_POINTER_TAGS[i].number == tagNumber) { 1844 return IFD_POINTER_TAG_HINTS[i]; 1845 } 1846 } 1847 return -1; 1848 } 1849 1850 // Writes an Exif segment into the given output stream. 1851 private int writeExifSegment(ExifDataOutputStream dataOutputStream, int exifOffsetFromBeginning) 1852 throws IOException { 1853 // The following variables are for calculating each IFD tag group size in bytes. 1854 int[] ifdOffsets = new int[EXIF_TAGS.length]; 1855 int[] ifdDataSizes = new int[EXIF_TAGS.length]; 1856 1857 // Remove IFD pointer tags (we'll re-add it later.) 1858 for (ExifTag tag : IFD_POINTER_TAGS) { 1859 setAttribute(tag.name, null); 1860 } 1861 1862 // Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD 1863 // offset when there is one or more tags in the thumbnail IFD. 1864 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1865 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, "0"); 1866 } 1867 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1868 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, "0"); 1869 } 1870 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1871 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, "0"); 1872 } 1873 // Remove old thumbnail data 1874 setAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name, null); 1875 setAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, null); 1876 if (mHasThumbnail) { 1877 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, "0"); 1878 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1879 String.valueOf(mThumbnailLength)); 1880 } 1881 1882 // Remove null value tags. 1883 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1884 for (Object obj : mAttributes[hint].entrySet().toArray()) { 1885 Map.Entry entry = (Map.Entry) obj; 1886 if (entry.getValue() == null) { 1887 mAttributes[hint].remove(entry.getKey()); 1888 } 1889 } 1890 } 1891 1892 // Calculate IFD group data area sizes. IFD group data area is assigned to save the entry 1893 // value which has a bigger size than 4 bytes. 1894 for (int i = 0; i < 5; ++i) { 1895 int sum = 0; 1896 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) { 1897 String entryValue = (String) ((Map.Entry) entry).getValue(); 1898 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1899 int size = getSizeOfExifEntryValue(dataFormat, entryValue); 1900 if (size > 4) { 1901 sum += size; 1902 } 1903 } 1904 ifdDataSizes[i] += sum; 1905 } 1906 1907 // Calculate IFD offsets. 1908 int position = 8; 1909 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1910 if (!mAttributes[hint].isEmpty()) { 1911 ifdOffsets[hint] = position; 1912 position += 2 + mAttributes[hint].size() * 12 + 4 + ifdDataSizes[hint]; 1913 } 1914 } 1915 if (mHasThumbnail) { 1916 int thumbnailOffset = position; 1917 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_TAG.name, 1918 String.valueOf(thumbnailOffset)); 1919 mAttributes[IFD_TIFF_HINT].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name, 1920 String.valueOf(mThumbnailLength)); 1921 mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset; 1922 position += mThumbnailLength; 1923 } 1924 1925 // Calculate the total size 1926 int totalSize = position + 8; // eight bytes is for header part. 1927 if (DEBUG) { 1928 Log.d(TAG, "totalSize length: " + totalSize); 1929 for (int i = 0; i < 5; ++i) { 1930 Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d", 1931 i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i])); 1932 } 1933 } 1934 1935 // Update IFD pointer tags with the calculated offsets. 1936 if (!mAttributes[IFD_EXIF_HINT].isEmpty()) { 1937 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[0].name, 1938 String.valueOf(ifdOffsets[IFD_EXIF_HINT])); 1939 } 1940 if (!mAttributes[IFD_GPS_HINT].isEmpty()) { 1941 mAttributes[IFD_TIFF_HINT].put(IFD_POINTER_TAGS[1].name, 1942 String.valueOf(ifdOffsets[IFD_GPS_HINT])); 1943 } 1944 if (!mAttributes[IFD_INTEROPERABILITY_HINT].isEmpty()) { 1945 mAttributes[IFD_EXIF_HINT].put(IFD_POINTER_TAGS[2].name, 1946 String.valueOf(ifdOffsets[IFD_INTEROPERABILITY_HINT])); 1947 } 1948 1949 // Write TIFF Headers. See JEITA CP-3451C Table 1. page 10. 1950 dataOutputStream.writeUnsignedShort(totalSize); 1951 dataOutputStream.write(IDENTIFIER_EXIF_APP1); 1952 dataOutputStream.writeShort(BYTE_ALIGN_MM); 1953 dataOutputStream.writeUnsignedShort(0x2a); 1954 dataOutputStream.writeUnsignedInt(8); 1955 1956 // Write IFD groups. See JEITA CP-3451C Figure 7. page 12. 1957 for (int hint = 0; hint < EXIF_TAGS.length; ++hint) { 1958 if (!mAttributes[hint].isEmpty()) { 1959 // See JEITA CP-3451C 4.6.2 IFD structure. page 13. 1960 // Write entry count 1961 dataOutputStream.writeUnsignedShort(mAttributes[hint].size()); 1962 1963 // Write entry info 1964 int dataOffset = ifdOffsets[hint] + 2 + mAttributes[hint].size() * 12 + 4; 1965 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 1966 // Convert tag name to tag number. 1967 int tagNumber = (int) sExifTagMapsForWriting[hint].get(entry.getKey()); 1968 String entryValue = (String) entry.getValue(); 1969 1970 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 1971 int numberOfComponents = getNumberOfComponentsInExifEntryValue(dataFormat, 1972 entryValue); 1973 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 1974 1975 dataOutputStream.writeUnsignedShort(tagNumber); 1976 dataOutputStream.writeUnsignedShort(dataFormat); 1977 dataOutputStream.writeInt(numberOfComponents); 1978 if (byteCount > 4) { 1979 dataOutputStream.writeUnsignedInt(dataOffset); 1980 dataOffset += byteCount; 1981 } else { 1982 int bytesWritten = writeExifEntryValue(dataOutputStream, entryValue); 1983 // Fill zero up to 4 bytes 1984 if (bytesWritten < 4) { 1985 for (int i = bytesWritten; i < 4; ++i) { 1986 dataOutputStream.write(0); 1987 } 1988 } 1989 } 1990 } 1991 1992 // Write the next offset. It writes the offset of thumbnail IFD if there is one or 1993 // more tags in the thumbnail IFD when the current IFD is the primary image TIFF 1994 // IFD; Otherwise 0. 1995 if (hint == 0 && !mAttributes[IFD_THUMBNAIL_HINT].isEmpty()) { 1996 dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_THUMBNAIL_HINT]); 1997 } else { 1998 dataOutputStream.writeUnsignedInt(0); 1999 } 2000 2001 // Write values of data field exceeding 4 bytes after the next offset. 2002 for (Map.Entry entry : (Set<Map.Entry>) mAttributes[hint].entrySet()) { 2003 String entryValue = (String) entry.getValue(); 2004 2005 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2006 int byteCount = getSizeOfExifEntryValue(dataFormat, entryValue); 2007 if (byteCount > 4) { 2008 writeExifEntryValue(dataOutputStream, entryValue); 2009 } 2010 } 2011 } 2012 } 2013 2014 // Write thumbnail 2015 if (mHasThumbnail) { 2016 dataOutputStream.write(getThumbnail()); 2017 } 2018 2019 return totalSize; 2020 } 2021 2022 // Writes EXIF entry value and its entry value type will be automatically determined. 2023 private static int writeExifEntryValue(ExifDataOutputStream dataOutputStream, String entryValue) 2024 throws IOException { 2025 int bytesWritten = 0; 2026 int dataFormat = getDataFormatOfExifEntryValue(entryValue); 2027 2028 if (dataFormat == IFD_FORMAT_STRING) { 2029 byte[] asciiArray = (entryValue + '\0').getBytes(Charset.forName("US-ASCII")); 2030 dataOutputStream.write(asciiArray); 2031 return asciiArray.length; 2032 } 2033 2034 // Values can be composed of several components. Each component is separated by char ','. 2035 String[] components = entryValue.split(","); 2036 for (String component : components) { 2037 switch (dataFormat) { 2038 case IFD_FORMAT_SLONG: 2039 dataOutputStream.writeInt(Integer.parseInt(component)); 2040 bytesWritten += 4; 2041 break; 2042 case IFD_FORMAT_DOUBLE: 2043 dataOutputStream.writeDouble(Double.parseDouble(component)); 2044 bytesWritten += 8; 2045 break; 2046 case IFD_FORMAT_SRATIONAL: 2047 String[] rationalNumber = component.split("/"); 2048 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[0])); 2049 dataOutputStream.writeInt(Integer.parseInt(rationalNumber[1])); 2050 bytesWritten += 8; 2051 break; 2052 default: 2053 throw new IllegalArgumentException(); 2054 } 2055 } 2056 return bytesWritten; 2057 } 2058 2059 // Determines the data format of EXIF entry value. 2060 private static int getDataFormatOfExifEntryValue(String entryValue) { 2061 // See TIFF 6.0 spec Types. page 15. 2062 // Take the first component if there are more than one component. 2063 if (entryValue.contains(",")) { 2064 String[] entryValues = entryValue.split(","); 2065 int dataFormat = getDataFormatOfExifEntryValue(entryValues[0]); 2066 if (dataFormat == IFD_FORMAT_STRING) { 2067 return IFD_FORMAT_STRING; 2068 } 2069 for (int i = 1; i < entryValues.length; ++i) { 2070 if (getDataFormatOfExifEntryValue(entryValues[i]) != dataFormat) { 2071 return IFD_FORMAT_STRING; 2072 } 2073 } 2074 return dataFormat; 2075 } 2076 2077 if (entryValue.contains("/")) { 2078 String[] rationalNumber = entryValue.split("/"); 2079 if (rationalNumber.length == 2) { 2080 try { 2081 Integer.parseInt(rationalNumber[0]); 2082 Integer.parseInt(rationalNumber[1]); 2083 return IFD_FORMAT_SRATIONAL; 2084 } catch (NumberFormatException e) { 2085 // Ignored 2086 } 2087 } 2088 return IFD_FORMAT_STRING; 2089 } 2090 try { 2091 Integer.parseInt(entryValue); 2092 return IFD_FORMAT_SLONG; 2093 } catch (NumberFormatException e) { 2094 // Ignored 2095 } 2096 try { 2097 Double.parseDouble(entryValue); 2098 return IFD_FORMAT_DOUBLE; 2099 } catch (NumberFormatException e) { 2100 // Ignored 2101 } 2102 return IFD_FORMAT_STRING; 2103 } 2104 2105 // Determines the size of EXIF entry value. 2106 private static int getSizeOfExifEntryValue(int dataFormat, String entryValue) { 2107 // See TIFF 6.0 spec Types page 15. 2108 if (dataFormat == IFD_FORMAT_STRING) { 2109 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2110 } 2111 int bytesEstimated = 0; 2112 String[] components = entryValue.split(","); 2113 for (String component : components) { 2114 switch (dataFormat) { 2115 case IFD_FORMAT_SLONG: 2116 bytesEstimated += 4; 2117 break; 2118 case IFD_FORMAT_DOUBLE: 2119 bytesEstimated += 8; 2120 break; 2121 case IFD_FORMAT_SRATIONAL: 2122 bytesEstimated += 8; 2123 break; 2124 default: 2125 throw new IllegalArgumentException(); 2126 } 2127 } 2128 return bytesEstimated; 2129 } 2130 2131 // Determines the number of components of EXIF entry value. 2132 private static int getNumberOfComponentsInExifEntryValue(int dataFormat, String entryValue) { 2133 if (dataFormat == IFD_FORMAT_STRING) { 2134 return (entryValue + '\0').getBytes(Charset.forName("US-ASCII")).length; 2135 } 2136 int count = 1; 2137 for (int i = 0; i < entryValue.length(); ++i) { 2138 if (entryValue.charAt(i) == ',') { 2139 ++count; 2140 } 2141 } 2142 return count; 2143 } 2144 2145 // An input stream to parse EXIF data area, which can be written in either little or big endian 2146 // order. 2147 private static class ByteOrderAwarenessDataInputStream extends ByteArrayInputStream { 2148 private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN; 2149 private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN; 2150 2151 private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN; 2152 private final long mLength; 2153 private long mPosition; 2154 2155 public ByteOrderAwarenessDataInputStream(byte[] bytes) { 2156 super(bytes); 2157 mLength = bytes.length; 2158 mPosition = 0L; 2159 } 2160 2161 public void setByteOrder(ByteOrder byteOrder) { 2162 mByteOrder = byteOrder; 2163 } 2164 2165 public void seek(long byteCount) throws IOException { 2166 mPosition = 0L; 2167 reset(); 2168 if (skip(byteCount) != byteCount) { 2169 throw new IOException("Couldn't seek up to the byteCount"); 2170 } 2171 } 2172 2173 public long peek() { 2174 return mPosition; 2175 } 2176 2177 public void readFully(byte[] buffer) throws IOException { 2178 mPosition += buffer.length; 2179 if (mPosition > mLength) { 2180 throw new EOFException(); 2181 } 2182 if (super.read(buffer, 0, buffer.length) != buffer.length) { 2183 throw new IOException("Couldn't read up to the length of buffer"); 2184 } 2185 } 2186 2187 public byte readByte() throws IOException { 2188 ++mPosition; 2189 if (mPosition > mLength) { 2190 throw new EOFException(); 2191 } 2192 int ch = super.read(); 2193 if (ch < 0) { 2194 throw new EOFException(); 2195 } 2196 return (byte) ch; 2197 } 2198 2199 public short readShort() throws IOException { 2200 mPosition += 2; 2201 if (mPosition > mLength) { 2202 throw new EOFException(); 2203 } 2204 int ch1 = super.read(); 2205 int ch2 = super.read(); 2206 if ((ch1 | ch2) < 0) { 2207 throw new EOFException(); 2208 } 2209 if (mByteOrder == LITTLE_ENDIAN) { 2210 return (short) ((ch2 << 8) + (ch1)); 2211 } else if (mByteOrder == BIG_ENDIAN) { 2212 return (short) ((ch1 << 8) + (ch2)); 2213 } 2214 throw new IOException("Invalid byte order: " + mByteOrder); 2215 } 2216 2217 public int readInt() throws IOException { 2218 mPosition += 4; 2219 if (mPosition > mLength) { 2220 throw new EOFException(); 2221 } 2222 int ch1 = super.read(); 2223 int ch2 = super.read(); 2224 int ch3 = super.read(); 2225 int ch4 = super.read(); 2226 if ((ch1 | ch2 | ch3 | ch4) < 0) { 2227 throw new EOFException(); 2228 } 2229 if (mByteOrder == LITTLE_ENDIAN) { 2230 return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1); 2231 } else if (mByteOrder == BIG_ENDIAN) { 2232 return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4); 2233 } 2234 throw new IOException("Invalid byte order: " + mByteOrder); 2235 } 2236 2237 @Override 2238 public long skip(long byteCount) { 2239 long skipped = super.skip(Math.min(byteCount, mLength - mPosition)); 2240 mPosition += skipped; 2241 return skipped; 2242 } 2243 2244 public int readUnsignedShort() throws IOException { 2245 mPosition += 2; 2246 if (mPosition > mLength) { 2247 throw new EOFException(); 2248 } 2249 int ch1 = super.read(); 2250 int ch2 = super.read(); 2251 if ((ch1 | ch2) < 0) { 2252 throw new EOFException(); 2253 } 2254 if (mByteOrder == LITTLE_ENDIAN) { 2255 return ((ch2 << 8) + (ch1)); 2256 } else if (mByteOrder == BIG_ENDIAN) { 2257 return ((ch1 << 8) + (ch2)); 2258 } 2259 throw new IOException("Invalid byte order: " + mByteOrder); 2260 } 2261 2262 public long readUnsignedInt() throws IOException { 2263 return readInt() & 0xffffffffL; 2264 } 2265 2266 public long readLong() throws IOException { 2267 mPosition += 8; 2268 if (mPosition > mLength) { 2269 throw new EOFException(); 2270 } 2271 int ch1 = super.read(); 2272 int ch2 = super.read(); 2273 int ch3 = super.read(); 2274 int ch4 = super.read(); 2275 int ch5 = super.read(); 2276 int ch6 = super.read(); 2277 int ch7 = super.read(); 2278 int ch8 = super.read(); 2279 if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) { 2280 throw new EOFException(); 2281 } 2282 if (mByteOrder == LITTLE_ENDIAN) { 2283 return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40) 2284 + ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16) 2285 + ((long) ch2 << 8) + (long) ch1); 2286 } else if (mByteOrder == BIG_ENDIAN) { 2287 return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40) 2288 + ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16) 2289 + ((long) ch7 << 8) + (long) ch8); 2290 } 2291 throw new IOException("Invalid byte order: " + mByteOrder); 2292 } 2293 2294 public float readFloat() throws IOException { 2295 return Float.intBitsToFloat(readInt()); 2296 } 2297 2298 public double readDouble() throws IOException { 2299 return Double.longBitsToDouble(readLong()); 2300 } 2301 } 2302 2303 // An output stream to write EXIF data area, that will be written in big endian byte order. 2304 private static class ExifDataOutputStream extends DataOutputStream { 2305 public ExifDataOutputStream(OutputStream out) { 2306 super(out); 2307 } 2308 2309 public void writeUnsignedShort(int val) throws IOException { 2310 writeShort((short) val); 2311 } 2312 2313 public void writeUnsignedInt(long val) throws IOException { 2314 writeInt((int) val); 2315 } 2316 } 2317 2318 // JNI methods for RAW formats. 2319 private static native void nativeInitRaw(); 2320 private static native byte[] nativeGetThumbnailFromAsset( 2321 long asset, int thumbnailOffset, int thumbnailLength); 2322 private static native HashMap nativeGetRawAttributesFromAsset(long asset); 2323 private static native HashMap nativeGetRawAttributesFromFileDescriptor(FileDescriptor fd); 2324 private static native HashMap nativeGetRawAttributesFromInputStream(InputStream in); 2325} 2326