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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /image/decoders/EXIF.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'image/decoders/EXIF.h')
-rw-r--r-- | image/decoders/EXIF.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/image/decoders/EXIF.h b/image/decoders/EXIF.h new file mode 100644 index 0000000000..eb23f8d537 --- /dev/null +++ b/image/decoders/EXIF.h @@ -0,0 +1,95 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_image_decoders_EXIF_h +#define mozilla_image_decoders_EXIF_h + +#include <stdint.h> +#include "nsDebug.h" + +#include "Orientation.h" +#include "mozilla/Maybe.h" +#include "mozilla/image/Resolution.h" +#include "mozilla/gfx/Point.h" + +namespace mozilla::image { + +enum class ByteOrder : uint8_t { Unknown, LittleEndian, BigEndian }; + +struct EXIFData { + const Orientation orientation = Orientation(); + const Resolution resolution = Resolution(); +}; + +struct ParsedEXIFData; + +enum class ResolutionUnit : uint8_t { + Dpi, + Dpcm, +}; + +class EXIFParser { + public: + static EXIFData Parse(const uint8_t* aData, const uint32_t aLength, + const gfx::IntSize& aRealImageSize) { + EXIFParser parser; + return parser.ParseEXIF(aData, aLength, aRealImageSize); + } + + private: + EXIFParser() + : mStart(nullptr), + mCurrent(nullptr), + mLength(0), + mRemainingLength(0), + mByteOrder(ByteOrder::Unknown) {} + + EXIFData ParseEXIF(const uint8_t* aData, const uint32_t aLength, + const gfx::IntSize& aRealImageSize); + bool ParseEXIFHeader(); + bool ParseTIFFHeader(uint32_t& aIFD0OffsetOut); + + void ParseIFD(ParsedEXIFData&, uint32_t aDepth = 0); + bool ParseOrientation(uint16_t aType, uint32_t aCount, Orientation&); + bool ParseResolution(uint16_t aType, uint32_t aCount, Maybe<float>&); + bool ParseResolutionUnit(uint16_t aType, uint32_t aCount, + Maybe<ResolutionUnit>&); + bool ParseDimension(uint16_t aType, uint32_t aCount, Maybe<uint32_t>&); + + bool Initialize(const uint8_t* aData, const uint32_t aLength); + void Advance(const uint32_t aDistance); + void JumpTo(const uint32_t aOffset); + + uint32_t CurrentOffset() const { return mCurrent - mStart; } + + class ScopedJump { + EXIFParser& mParser; + uint32_t mOldOffset; + + public: + ScopedJump(EXIFParser& aParser, uint32_t aOffset) + : mParser(aParser), mOldOffset(aParser.CurrentOffset()) { + mParser.JumpTo(aOffset); + } + + ~ScopedJump() { mParser.JumpTo(mOldOffset); } + }; + + bool MatchString(const char* aString, const uint32_t aLength); + bool MatchUInt16(const uint16_t aValue); + bool ReadUInt16(uint16_t& aOut); + bool ReadUInt32(uint32_t& aOut); + bool ReadRational(float& aOut); + + const uint8_t* mStart; + const uint8_t* mCurrent; + uint32_t mLength; + uint32_t mRemainingLength; + ByteOrder mByteOrder; +}; + +} // namespace mozilla::image + +#endif // mozilla_image_decoders_EXIF_h |