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comparison: image/decoders/EXIF.h
image/decoders/EXIF.h
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| -1:000000000000 | 0:cc7eeec916cc |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef MOZILLA_IMAGELIB_EXIF_H_ | |
| 7 #define MOZILLA_IMAGELIB_EXIF_H_ | |
| 8 | |
| 9 #include <stdint.h> | |
| 10 #include "mozilla/TypedEnum.h" | |
| 11 #include "nsDebug.h" | |
| 12 | |
| 13 #include "Orientation.h" | |
| 14 | |
| 15 namespace mozilla { | |
| 16 namespace image { | |
| 17 | |
| 18 MOZ_BEGIN_ENUM_CLASS(ByteOrder, uint8_t) | |
| 19 Unknown, | |
| 20 LittleEndian, | |
| 21 BigEndian | |
| 22 MOZ_END_ENUM_CLASS(ByteOrder) | |
| 23 | |
| 24 struct EXIFData | |
| 25 { | |
| 26 EXIFData() { } | |
| 27 explicit EXIFData(Orientation aOrientation) : orientation(aOrientation) { } | |
| 28 | |
| 29 const Orientation orientation; | |
| 30 }; | |
| 31 | |
| 32 class EXIFParser | |
| 33 { | |
| 34 public: | |
| 35 static EXIFData | |
| 36 Parse(const uint8_t* aData, const uint32_t aLength) | |
| 37 { | |
| 38 EXIFParser parser; | |
| 39 return parser.ParseEXIF(aData, aLength); | |
| 40 } | |
| 41 | |
| 42 private: | |
| 43 EXIFParser() | |
| 44 : mStart(nullptr) | |
| 45 , mCurrent(nullptr) | |
| 46 , mLength(0) | |
| 47 , mRemainingLength(0) | |
| 48 , mByteOrder(ByteOrder::Unknown) | |
| 49 { } | |
| 50 | |
| 51 EXIFData ParseEXIF(const uint8_t* aData, const uint32_t aLength); | |
| 52 bool ParseEXIFHeader(); | |
| 53 bool ParseTIFFHeader(uint32_t& aIFD0OffsetOut); | |
| 54 bool ParseIFD0(Orientation& aOrientationOut); | |
| 55 bool ParseOrientation(uint16_t aType, uint32_t aCount, Orientation& aOut); | |
| 56 | |
| 57 bool Initialize(const uint8_t* aData, const uint32_t aLength); | |
| 58 void Advance(const uint32_t aDistance); | |
| 59 void JumpTo(const uint32_t aOffset); | |
| 60 | |
| 61 bool MatchString(const char* aString, const uint32_t aLength); | |
| 62 bool MatchUInt16(const uint16_t aValue); | |
| 63 bool ReadUInt16(uint16_t& aOut); | |
| 64 bool ReadUInt32(uint32_t& aOut); | |
| 65 | |
| 66 const uint8_t* mStart; | |
| 67 const uint8_t* mCurrent; | |
| 68 uint32_t mLength; | |
| 69 uint32_t mRemainingLength; | |
| 70 ByteOrder mByteOrder; | |
| 71 }; | |
| 72 | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 #endif |
