Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 1 | // Copyright 2015 Google Inc. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | // |
| 15 | //////////////////////////////////////////////////////////////////////////////// |
| 16 | |
| 17 | #include "src/tiff_parser.h" |
| 18 | |
| 19 | #include <cstring> |
| 20 | |
| 21 | #include "src/tiff_directory/tiff_directory.h" |
| 22 | |
| 23 | namespace piex { |
| 24 | namespace { |
| 25 | |
| 26 | using tiff_directory::Endian; |
| 27 | using tiff_directory::Rational; |
| 28 | using tiff_directory::SRational; |
| 29 | using tiff_directory::SizeOfType; |
| 30 | using tiff_directory::TIFF_TYPE_LONG; |
| 31 | using tiff_directory::TIFF_TYPE_UNDEFINED; |
| 32 | using tiff_directory::TiffDirectory; |
| 33 | using tiff_directory::kBigEndian; |
| 34 | using tiff_directory::kLittleEndian; |
| 35 | |
| 36 | // Specifies all tags that might be of interest to parse JPEG data. |
| 37 | const std::uint32_t kStartOfFrame = 0xFFC0; |
| 38 | const std::uint32_t kStartOfImage = 0xFFD8; |
| 39 | const std::uint32_t kStartOfScan = 0xFFDA; |
| 40 | |
| 41 | // Reads the width and height of the full resolution image. The tag groups are |
| 42 | // exclusive. |
| 43 | bool GetFullDimension(const TiffDirectory& tiff_directory, std::uint32_t* width, |
| 44 | std::uint32_t* height) { |
| 45 | if (tiff_directory.Has(kExifTagWidth) && tiff_directory.Has(kExifTagHeight)) { |
| 46 | if (!tiff_directory.Get(kExifTagWidth, width) || |
| 47 | !tiff_directory.Get(kExifTagHeight, height)) { |
| 48 | return false; |
| 49 | } |
| 50 | } else if (tiff_directory.Has(kTiffTagImageWidth) && |
| 51 | tiff_directory.Has(kTiffTagImageLength)) { |
| 52 | if (!tiff_directory.Get(kTiffTagImageWidth, width) || |
| 53 | !tiff_directory.Get(kTiffTagImageLength, height)) { |
| 54 | return false; |
| 55 | } |
| 56 | } else if (tiff_directory.Has(kPanaTagTopBorder) && |
| 57 | tiff_directory.Has(kPanaTagLeftBorder) && |
| 58 | tiff_directory.Has(kPanaTagBottomBorder) && |
| 59 | tiff_directory.Has(kPanaTagRightBorder)) { |
| 60 | std::uint32_t left; |
| 61 | std::uint32_t right; |
| 62 | std::uint32_t top; |
| 63 | std::uint32_t bottom; |
| 64 | if (tiff_directory.Get(kPanaTagLeftBorder, &left) && |
| 65 | tiff_directory.Get(kPanaTagRightBorder, &right) && |
| 66 | tiff_directory.Get(kPanaTagTopBorder, &top) && |
| 67 | tiff_directory.Get(kPanaTagBottomBorder, &bottom) && bottom > top && |
| 68 | right > left) { |
| 69 | *height = bottom - top; |
| 70 | *width = right - left; |
| 71 | } else { |
| 72 | return false; |
| 73 | } |
| 74 | } else if (tiff_directory.Has(kExifTagDefaultCropSize)) { |
| 75 | std::vector<std::uint32_t> crop(2); |
| 76 | std::vector<Rational> crop_rational(2); |
| 77 | if (tiff_directory.Get(kExifTagDefaultCropSize, &crop)) { |
| 78 | *width = crop[0]; |
| 79 | *height = crop[1]; |
| 80 | } else if (tiff_directory.Get(kExifTagDefaultCropSize, &crop_rational) && |
| 81 | crop_rational[0].denominator != 0 && |
| 82 | crop_rational[1].denominator != 0) { |
| 83 | *width = crop_rational[0].numerator / crop_rational[0].denominator; |
| 84 | *height = crop_rational[1].numerator / crop_rational[1].denominator; |
| 85 | } else { |
| 86 | return false; |
| 87 | } |
| 88 | } |
| 89 | return true; |
| 90 | } |
| 91 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 92 | bool GetRational(const TiffDirectory::Tag& tag, const TiffDirectory& directory, |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 93 | const int data_size, PreviewImageData::Rational* data) { |
| 94 | std::vector<Rational> value; |
| 95 | if (directory.Get(tag, &value)) { |
| 96 | for (size_t i = 0; i < value.size(); ++i) { |
| 97 | data[i].numerator = value[i].numerator; |
| 98 | data[i].denominator = value[i].denominator; |
| 99 | } |
| 100 | return true; |
| 101 | } |
| 102 | return false; |
| 103 | } |
| 104 | |
| 105 | void FillGpsPreviewImageData(const TiffDirectory& gps_directory, |
| 106 | PreviewImageData* preview_image_data) { |
| 107 | if (gps_directory.Has(kGpsTagLatitudeRef) && |
| 108 | gps_directory.Has(kGpsTagLatitude) && |
| 109 | gps_directory.Has(kGpsTagLongitudeRef) && |
| 110 | gps_directory.Has(kGpsTagLongitude) && |
| 111 | gps_directory.Has(kGpsTagTimeStamp) && |
| 112 | gps_directory.Has(kGpsTagDateStamp)) { |
| 113 | preview_image_data->gps.is_valid = false; |
| 114 | std::string value; |
| 115 | if (!gps_directory.Get(kGpsTagLatitudeRef, &value) || value.empty() || |
| 116 | (value[0] != 'N' && value[0] != 'S') || |
| 117 | !GetRational(kGpsTagLatitude, gps_directory, 3 /* data size */, |
| 118 | preview_image_data->gps.latitude)) { |
| 119 | return; |
| 120 | } |
| 121 | preview_image_data->gps.latitude_ref = value[0]; |
| 122 | |
| 123 | if (!gps_directory.Get(kGpsTagLongitudeRef, &value) || value.empty() || |
| 124 | (value[0] != 'E' && value[0] != 'W') || |
| 125 | !GetRational(kGpsTagLongitude, gps_directory, 3 /* data size */, |
| 126 | preview_image_data->gps.longitude)) { |
| 127 | return; |
| 128 | } |
| 129 | preview_image_data->gps.longitude_ref = value[0]; |
| 130 | |
| 131 | if (!GetRational(kGpsTagTimeStamp, gps_directory, 3 /* data size */, |
| 132 | preview_image_data->gps.time_stamp)) { |
| 133 | return; |
| 134 | } |
| 135 | |
Yujie Qin | afc6ebd | 2016-01-25 13:12:07 +0100 | [diff] [blame] | 136 | const size_t kGpsDateStampSize = 11; |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 137 | if (!gps_directory.Get(kGpsTagDateStamp, |
| 138 | &preview_image_data->gps.date_stamp)) { |
| 139 | return; |
| 140 | } |
| 141 | if (preview_image_data->gps.date_stamp.size() == kGpsDateStampSize) { |
| 142 | // Resize the date_stamp to remove the "NULL" at the end of string. |
| 143 | preview_image_data->gps.date_stamp.resize(kGpsDateStampSize - 1); |
| 144 | } else { |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | if (gps_directory.Has(kGpsTagAltitudeRef) && |
| 149 | gps_directory.Has(kGpsTagAltitude)) { |
| 150 | std::vector<std::uint8_t> bytes; |
| 151 | if (!gps_directory.Get(kGpsTagAltitudeRef, &bytes) || bytes.empty() || |
| 152 | !GetRational(kGpsTagAltitude, gps_directory, 1, |
| 153 | &preview_image_data->gps.altitude)) { |
| 154 | return; |
| 155 | } |
| 156 | preview_image_data->gps.altitude_ref = bytes[0] != 0; |
| 157 | } |
| 158 | preview_image_data->gps.is_valid = true; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | Error FillPreviewImageData(const TiffDirectory& tiff_directory, |
| 163 | PreviewImageData* preview_image_data) { |
| 164 | bool success = true; |
Yujie Qin | 3eaa831 | 2016-01-15 16:22:20 +0100 | [diff] [blame] | 165 | // Get preview_offset and preview_length |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 166 | if (tiff_directory.Has(kTiffTagStripOffsets) && |
| 167 | tiff_directory.Has(kTiffTagStripByteCounts)) { |
| 168 | std::vector<std::uint32_t> strip_offsets; |
| 169 | std::vector<std::uint32_t> strip_byte_counts; |
| 170 | if (!tiff_directory.Get(kTiffTagStripOffsets, &strip_offsets) || |
| 171 | !tiff_directory.Get(kTiffTagStripByteCounts, &strip_byte_counts)) { |
| 172 | return kFail; |
| 173 | } |
| 174 | if (strip_offsets.size() == 1 && strip_byte_counts.size() == 1) { |
| 175 | preview_image_data->preview_offset = strip_offsets[0]; |
| 176 | preview_image_data->preview_length = strip_byte_counts[0]; |
| 177 | } |
| 178 | } else if (tiff_directory.Has(kTiffTagJpegOffset) && |
| 179 | tiff_directory.Has(kTiffTagJpegByteCount)) { |
| 180 | success &= tiff_directory.Get(kTiffTagJpegOffset, |
| 181 | &preview_image_data->preview_offset); |
| 182 | success &= tiff_directory.Get(kTiffTagJpegByteCount, |
| 183 | &preview_image_data->preview_length); |
| 184 | } else if (tiff_directory.Has(kPanaTagJpegImage)) { |
| 185 | if (!tiff_directory.GetOffsetAndLength( |
| 186 | kPanaTagJpegImage, TIFF_TYPE_UNDEFINED, |
| 187 | &preview_image_data->preview_offset, |
| 188 | &preview_image_data->preview_length)) { |
| 189 | return kFail; |
| 190 | } |
| 191 | } |
| 192 | |
Yujie Qin | 3eaa831 | 2016-01-15 16:22:20 +0100 | [diff] [blame] | 193 | // Get exif_orientation if it was not set already. |
| 194 | if (tiff_directory.Has(kTiffTagOrientation) && |
| 195 | preview_image_data->exif_orientation == 1) { |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 196 | success &= tiff_directory.Get(kTiffTagOrientation, |
| 197 | &preview_image_data->exif_orientation); |
| 198 | } |
| 199 | |
| 200 | // Get color_space |
| 201 | if (tiff_directory.Has(kExifTagColorSpace)) { |
| 202 | std::uint32_t color_space; |
| 203 | success &= tiff_directory.Get(kExifTagColorSpace, &color_space); |
| 204 | if (color_space == 1) { |
| 205 | preview_image_data->color_space = PreviewImageData::kSrgb; |
Yujie Qin | 3eaa831 | 2016-01-15 16:22:20 +0100 | [diff] [blame] | 206 | } else if (color_space == 65535 || color_space == 2) { |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 207 | preview_image_data->color_space = PreviewImageData::kAdobeRgb; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | success &= GetFullDimension(tiff_directory, &preview_image_data->full_width, |
| 212 | &preview_image_data->full_height); |
| 213 | |
| 214 | if (tiff_directory.Has(kTiffTagMake)) { |
| 215 | success &= tiff_directory.Get(kTiffTagMake, &preview_image_data->maker); |
| 216 | } |
| 217 | |
| 218 | if (tiff_directory.Has(kTiffTagModel)) { |
| 219 | success &= tiff_directory.Get(kTiffTagModel, &preview_image_data->model); |
| 220 | } |
| 221 | |
| 222 | if (tiff_directory.Has(kExifTagDateTimeOriginal)) { |
| 223 | success &= tiff_directory.Get(kExifTagDateTimeOriginal, |
| 224 | &preview_image_data->date_time); |
| 225 | } |
| 226 | |
| 227 | if (tiff_directory.Has(kExifTagIsoSpeed)) { |
| 228 | success &= tiff_directory.Get(kExifTagIsoSpeed, &preview_image_data->iso); |
| 229 | } else if (tiff_directory.Has(kPanaTagIso)) { |
| 230 | success &= tiff_directory.Get(kPanaTagIso, &preview_image_data->iso); |
| 231 | } |
| 232 | |
| 233 | if (tiff_directory.Has(kExifTagExposureTime)) { |
| 234 | success &= GetRational(kExifTagExposureTime, tiff_directory, 1, |
| 235 | &preview_image_data->exposure_time); |
| 236 | } |
| 237 | |
| 238 | if (tiff_directory.Has(kExifTagFnumber)) { |
| 239 | success &= GetRational(kExifTagFnumber, tiff_directory, 1, |
| 240 | &preview_image_data->fnumber); |
| 241 | } |
| 242 | |
| 243 | if (tiff_directory.Has(kExifTagFocalLength)) { |
| 244 | success &= GetRational(kExifTagFocalLength, tiff_directory, 1, |
| 245 | &preview_image_data->focal_length); |
| 246 | } |
| 247 | |
| 248 | if (!success) { |
| 249 | return kFail; |
| 250 | } |
| 251 | |
| 252 | return kOk; |
| 253 | } |
| 254 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 255 | const TiffDirectory* FindFirstTagInIfds(const TiffDirectory::Tag& tag, |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 256 | const IfdVector& tiff_directory) { |
| 257 | for (std::uint32_t i = 0; i < tiff_directory.size(); ++i) { |
| 258 | if (tiff_directory[i].Has(tag)) { |
| 259 | return &tiff_directory[i]; |
| 260 | } |
| 261 | |
| 262 | // Recursively search sub directories. |
| 263 | const TiffDirectory* sub_directory = |
| 264 | FindFirstTagInIfds(tag, tiff_directory[i].GetSubDirectories()); |
| 265 | if (sub_directory != NULL) { |
| 266 | return sub_directory; |
| 267 | } |
| 268 | } |
| 269 | return NULL; |
| 270 | } |
| 271 | |
| 272 | // Gets the SubIfd content. |
| 273 | void ParseSubIfds(const std::uint32_t tiff_offset, const TagSet& desired_tags, |
| 274 | const std::uint32_t max_number_ifds, const Endian endian, |
| 275 | StreamInterface* stream, TiffDirectory* tiff_ifd, |
| 276 | Error* error) { |
| 277 | if (*error == kOk && tiff_ifd->Has(kTiffTagSubIfd)) { |
| 278 | std::uint32_t offset = 0; |
| 279 | std::uint32_t length = 0; |
| 280 | tiff_ifd->GetOffsetAndLength(kTiffTagSubIfd, TIFF_TYPE_LONG, &offset, |
| 281 | &length); |
| 282 | length /= 4; // length in bytes divided by 4 gives number of IFDs. |
| 283 | for (std::uint32_t j = 0; j < length && j < max_number_ifds; ++j) { |
| 284 | std::uint32_t sub_offset; |
| 285 | if (!Get32u(stream, offset + 4 * j, endian, &sub_offset)) { |
| 286 | *error = kFail; |
| 287 | return; |
| 288 | } |
| 289 | |
| 290 | std::uint32_t next_ifd_offset; |
| 291 | TiffDirectory sub_ifd(static_cast<Endian>(endian)); |
| 292 | *error = ParseDirectory(tiff_offset, sub_offset, endian, desired_tags, |
| 293 | stream, &sub_ifd, &next_ifd_offset); |
| 294 | if (*error != kOk) { |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | tiff_ifd->AddSubDirectory(sub_ifd); |
| 299 | } |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | } // namespace |
| 304 | |
| 305 | bool Get16u(StreamInterface* stream, const std::uint32_t offset, |
| 306 | const Endian& endian, std::uint16_t* value) { |
| 307 | std::uint8_t data[2]; |
| 308 | if (stream->GetData(offset, 2, data) == kOk) { |
| 309 | if (endian == kBigEndian) { |
| 310 | *value = (data[0] * 0x100) | data[1]; |
| 311 | } else { |
| 312 | *value = (data[1] * 0x100) | data[0]; |
| 313 | } |
| 314 | return true; |
| 315 | } else { |
| 316 | return false; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | bool Get32u(StreamInterface* stream, const std::uint32_t offset, |
| 321 | const Endian& endian, std::uint32_t* value) { |
| 322 | std::uint8_t data[4]; |
| 323 | if (stream->GetData(offset, 4, data) == kOk) { |
| 324 | if (endian == kBigEndian) { |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 325 | *value = (data[0] * 0x1000000u) | (data[1] * 0x10000u) | |
| 326 | (data[2] * 0x100u) | data[3]; |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 327 | } else { |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 328 | *value = (data[3] * 0x1000000u) | (data[2] * 0x10000u) | |
| 329 | (data[1] * 0x100u) | data[0]; |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 330 | } |
| 331 | return true; |
| 332 | } else { |
| 333 | return false; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | std::vector<std::uint8_t> GetData(const size_t offset, const size_t length, |
| 338 | StreamInterface* stream, Error* error) { |
| 339 | // Read in chunks with a maximum size of 1 MiB. |
| 340 | const size_t kChunkSize = 1048576; |
| 341 | |
| 342 | std::vector<std::uint8_t> data; |
| 343 | size_t processed_data = 0; |
| 344 | while (*error == kOk && processed_data < length) { |
| 345 | size_t chunk_length = kChunkSize; |
| 346 | if (length - data.size() < kChunkSize) { |
| 347 | chunk_length = length - data.size(); |
| 348 | } |
| 349 | |
| 350 | data.resize(processed_data + chunk_length); |
| 351 | *error = stream->GetData(offset + processed_data, chunk_length, |
| 352 | &data[processed_data]); |
| 353 | |
| 354 | processed_data += chunk_length; |
| 355 | } |
| 356 | return data; |
| 357 | } |
| 358 | |
| 359 | bool GetEndianness(const std::uint32_t tiff_offset, StreamInterface* stream, |
| 360 | Endian* endian) { |
| 361 | const std::uint8_t kTiffBigEndianMagic[] = {'M', 'M'}; |
| 362 | const std::uint8_t kTiffLittleEndianMagic[] = {'I', 'I'}; |
| 363 | std::uint8_t tiff_endian[sizeof(kTiffBigEndianMagic)]; |
| 364 | if (stream->GetData(tiff_offset, sizeof(tiff_endian), &tiff_endian[0]) != |
| 365 | kOk) { |
| 366 | return false; |
| 367 | } |
| 368 | |
| 369 | if (!memcmp(tiff_endian, kTiffLittleEndianMagic, sizeof(tiff_endian))) { |
| 370 | *endian = kLittleEndian; |
| 371 | return true; |
| 372 | } else if (!memcmp(tiff_endian, kTiffBigEndianMagic, sizeof(tiff_endian))) { |
| 373 | *endian = kBigEndian; |
| 374 | return true; |
| 375 | } else { |
| 376 | return false; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | bool GetPreviewDimensions(const std::uint32_t jpeg_offset, |
| 381 | StreamInterface* stream, std::uint16_t* width, |
| 382 | std::uint16_t* height) { |
| 383 | const Endian endian = kBigEndian; |
| 384 | std::uint32_t offset = jpeg_offset; |
| 385 | std::uint16_t segment; |
| 386 | |
| 387 | // Parse the JPEG header until we find Frame0 which contains the image width |
| 388 | // and height or the actual image data starts (StartOfScan) |
| 389 | do { |
| 390 | if (!Get16u(stream, offset, endian, &segment)) { |
| 391 | return false; |
| 392 | } |
| 393 | offset += 2; |
| 394 | |
| 395 | switch (segment) { |
| 396 | case kStartOfImage: |
| 397 | break; |
| 398 | case kStartOfFrame: |
| 399 | return Get16u(stream, offset + 3, endian, height) && |
| 400 | Get16u(stream, offset + 5, endian, width); |
| 401 | default: { |
| 402 | std::uint16_t length; |
| 403 | if (!Get16u(stream, offset, endian, &length)) { |
| 404 | return false; |
| 405 | } |
| 406 | offset += length; |
| 407 | } |
| 408 | } |
| 409 | } while (segment != kStartOfScan); |
| 410 | |
| 411 | // No width and hight information found. |
| 412 | return false; |
| 413 | } |
| 414 | |
| 415 | Error ParseDirectory(const std::uint32_t tiff_offset, |
| 416 | const std::uint32_t ifd_offset, const Endian endian, |
| 417 | const TagSet& desired_tags, StreamInterface* stream, |
| 418 | TiffDirectory* tiff_directory, |
| 419 | std::uint32_t* next_ifd_offset) { |
| 420 | std::uint16_t number_of_entries; |
| 421 | if (!Get16u(stream, ifd_offset, endian, &number_of_entries)) { |
| 422 | return kFail; |
| 423 | } |
| 424 | |
| 425 | for (std::uint32_t i = 0; |
| 426 | i < static_cast<std::uint32_t>(number_of_entries) * 12; i += 12) { |
| 427 | std::uint16_t tag; |
| 428 | std::uint16_t type; |
| 429 | std::uint32_t number_of_elements; |
| 430 | if (Get16u(stream, ifd_offset + 2 + i, endian, &tag) && |
| 431 | Get16u(stream, ifd_offset + 4 + i, endian, &type) && |
| 432 | Get32u(stream, ifd_offset + 6 + i, endian, &number_of_elements)) { |
| 433 | // Check if the current tag should be handled. |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 434 | if (desired_tags.count(static_cast<TiffDirectory::Tag>(tag)) != 1) { |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 435 | continue; |
| 436 | } |
| 437 | } else { |
| 438 | return kFail; |
| 439 | } |
| 440 | |
| 441 | const size_t type_size = SizeOfType(type, nullptr /* no error */); |
| 442 | |
| 443 | // Check that type_size * number_of_elements does not exceed UINT32_MAX. |
| 444 | if (type_size != 0 && number_of_elements > UINT32_MAX / type_size) { |
| 445 | return kFail; |
| 446 | } |
| 447 | const size_t byte_count = |
| 448 | type_size * static_cast<size_t>(number_of_elements); |
| 449 | |
| 450 | std::uint32_t value_offset; |
| 451 | if (byte_count > 4 && |
| 452 | Get32u(stream, ifd_offset + 10 + i, endian, &value_offset)) { |
| 453 | value_offset += tiff_offset; |
| 454 | } else if (byte_count != 0) { |
| 455 | value_offset = ifd_offset + 10 + i; |
| 456 | } else { |
| 457 | // Ignore entries with an invalid byte count. |
| 458 | continue; |
| 459 | } |
| 460 | |
| 461 | Error error = kOk; |
| 462 | const std::vector<std::uint8_t> data = |
| 463 | GetData(value_offset, byte_count, stream, &error); |
| 464 | if (error != kOk) { |
| 465 | return error; |
| 466 | } |
| 467 | tiff_directory->AddEntry(tag, type, number_of_elements, value_offset, data); |
| 468 | } |
| 469 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 470 | if (Get32u(stream, ifd_offset + 2u + number_of_entries * 12u, endian, |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 471 | next_ifd_offset)) { |
| 472 | return kOk; |
| 473 | } else { |
| 474 | return kFail; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | TiffParser::TiffParser(StreamInterface* stream) : stream_(stream) {} |
| 479 | |
| 480 | TiffParser::TiffParser(StreamInterface* stream, const std::uint32_t offset) |
| 481 | : stream_(stream), tiff_offset_(offset) {} |
| 482 | |
| 483 | Error TiffParser::GetPreviewImageData(const TiffContent& tiff_content, |
| 484 | PreviewImageData* preview_image_data) { |
| 485 | Error error = kOk; |
| 486 | for (const auto& tiff_directory : tiff_content.tiff_directory) { |
| 487 | error = FillPreviewImageData(tiff_directory, preview_image_data); |
| 488 | if (error == kOk && tiff_directory.Has(kTiffTagExifIfd) && |
| 489 | tiff_content.exif_directory) { |
| 490 | error = FillPreviewImageData(*tiff_content.exif_directory, |
| 491 | preview_image_data); |
| 492 | } |
| 493 | if (error == kOk && tiff_directory.Has(kExifTagGps) && |
| 494 | tiff_content.gps_directory) { |
| 495 | FillGpsPreviewImageData(*tiff_content.gps_directory, preview_image_data); |
| 496 | } |
| 497 | for (const auto& sub_directory : tiff_directory.GetSubDirectories()) { |
| 498 | if (error == kOk) { |
| 499 | error = FillPreviewImageData(sub_directory, preview_image_data); |
| 500 | } |
| 501 | } |
| 502 | } |
| 503 | return error; |
| 504 | } |
| 505 | |
| 506 | Error TiffParser::Parse(const TagSet& desired_tags, |
| 507 | const std::uint16_t max_number_ifds, |
| 508 | TiffContent* tiff_content) { |
| 509 | if (!tiff_content->tiff_directory.empty()) { |
| 510 | return kFail; // You shall call Parse() only once. |
| 511 | } |
| 512 | |
| 513 | const std::uint32_t kTiffIdentifierSize = 4; |
| 514 | std::uint32_t offset_to_ifd = 0; |
| 515 | if (!GetEndianness(tiff_offset_, stream_, &endian_) || |
| 516 | !Get32u(stream_, tiff_offset_ + kTiffIdentifierSize, endian_, |
| 517 | &offset_to_ifd)) { |
| 518 | return kFail; |
| 519 | } |
| 520 | |
| 521 | Error error = ParseIfd(tiff_offset_ + offset_to_ifd, desired_tags, |
| 522 | max_number_ifds, &tiff_content->tiff_directory); |
| 523 | if (error != kOk) { |
| 524 | return error; |
| 525 | } |
| 526 | |
| 527 | // Get the Exif data. |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 528 | if (FindFirstTagInIfds(kTiffTagExifIfd, tiff_content->tiff_directory) != |
| 529 | nullptr) { |
| 530 | const TiffDirectory* tiff_ifd = |
| 531 | FindFirstTagInIfds(kTiffTagExifIfd, tiff_content->tiff_directory); |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 532 | std::uint32_t offset; |
| 533 | if (tiff_ifd->Get(kTiffTagExifIfd, &offset)) { |
| 534 | tiff_content->exif_directory.reset(new TiffDirectory(endian_)); |
| 535 | std::uint32_t next_ifd_offset; |
| 536 | error = ParseDirectory( |
| 537 | tiff_offset_, tiff_offset_ + offset, endian_, desired_tags, stream_, |
| 538 | tiff_content->exif_directory.get(), &next_ifd_offset); |
| 539 | if (error != kOk) { |
| 540 | return error; |
| 541 | } |
| 542 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 543 | return ParseGpsData(tiff_ifd, tiff_content); |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 544 | } |
| 545 | } |
| 546 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 547 | // Get the GPS data from the tiff ifd. |
| 548 | if (FindFirstTagInIfds(kExifTagGps, tiff_content->tiff_directory) != |
| 549 | nullptr) { |
| 550 | const TiffDirectory* tiff_ifd = |
| 551 | FindFirstTagInIfds(kExifTagGps, tiff_content->tiff_directory); |
| 552 | return ParseGpsData(tiff_ifd, tiff_content); |
| 553 | } |
| 554 | |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 555 | return error; |
| 556 | } |
| 557 | |
| 558 | Error TiffParser::ParseIfd(const std::uint32_t offset_to_ifd, |
| 559 | const TagSet& desired_tags, |
| 560 | const std::uint16_t max_number_ifds, |
| 561 | IfdVector* tiff_directory) { |
| 562 | std::uint32_t next_ifd_offset; |
| 563 | TiffDirectory tiff_ifd(static_cast<Endian>(endian_)); |
| 564 | Error error = |
| 565 | ParseDirectory(tiff_offset_, offset_to_ifd, endian_, desired_tags, |
| 566 | stream_, &tiff_ifd, &next_ifd_offset); |
| 567 | |
| 568 | ParseSubIfds(tiff_offset_, desired_tags, max_number_ifds, endian_, stream_, |
| 569 | &tiff_ifd, &error); |
| 570 | if (error == kOk) { |
| 571 | tiff_directory->push_back(tiff_ifd); |
| 572 | if (next_ifd_offset != 0 && tiff_directory->size() < max_number_ifds) { |
| 573 | error = ParseIfd(tiff_offset_ + next_ifd_offset, desired_tags, |
| 574 | max_number_ifds, tiff_directory); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | return error; |
| 579 | } |
| 580 | |
Eik Brauer | a954011 | 2016-01-27 13:25:41 +0100 | [diff] [blame^] | 581 | Error TiffParser::ParseGpsData(const TiffDirectory* tiff_ifd, |
| 582 | TiffContent* tiff_content) { |
| 583 | std::uint32_t offset; |
| 584 | if (tiff_ifd->Get(kExifTagGps, &offset)) { |
| 585 | tiff_content->gps_directory.reset(new TiffDirectory(endian_)); |
| 586 | const TagSet gps_tags = {kGpsTagLatitudeRef, kGpsTagLatitude, |
| 587 | kGpsTagLongitudeRef, kGpsTagLongitude, |
| 588 | kGpsTagAltitudeRef, kGpsTagAltitude, |
| 589 | kGpsTagTimeStamp, kGpsTagDateStamp}; |
| 590 | std::uint32_t next_ifd_offset; |
| 591 | return ParseDirectory(tiff_offset_, tiff_offset_ + offset, endian_, |
| 592 | gps_tags, stream_, tiff_content->gps_directory.get(), |
| 593 | &next_ifd_offset); |
| 594 | } |
| 595 | return kOk; |
| 596 | } |
| 597 | |
Jaesung Chung | 2934553 | 2016-01-14 02:28:47 +0900 | [diff] [blame] | 598 | } // namespace piex |