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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /image/decoders/EXIF.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'image/decoders/EXIF.h')
-rw-r--r--image/decoders/EXIF.h95
1 files changed, 95 insertions, 0 deletions
diff --git a/image/decoders/EXIF.h b/image/decoders/EXIF.h
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+++ b/image/decoders/EXIF.h
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+/* -*- 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