Parse icc profiles and exif orientation from jpeg markers

src/codec/SkRawCodec.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 519 matching lines @@
 private:
     // Quick check if the image contains a valid TIFF header as requested by DNG format.
     bool isTiffHeaderValid() const {
         const size_t kHeaderSize = 4;
         SkAutoSTMalloc<kHeaderSize, unsigned char> header(kHeaderSize);
         if (!fStream->read(header.get(), 0 /* offset */, kHeaderSize)) {
             return false;
         }
 
         // Check if the header is valid (endian info and magic number "42").
-        return
-            (header[0] == 0x49 && header[1] == 0x49 && header[2] == 0x2A && header[3] == 0x00) ||
-            (header[0] == 0x4D && header[1] == 0x4D && header[2] == 0x00 && header[3] == 0x2A);
+        bool littleEndian;
+        if (!is_valid_endian_marker(header, &littleEndian)) {
+            return false;
+        }
+
+        return 0x2A == get_endian_short(header + 2, littleEndian);
     }
 
     void init(const int width, const int height, const dng_point& cfaPatternSize) {
         fImageInfo = SkImageInfo::Make(width, height, kN32_SkColorType, kOpaque_SkAlphaType);
 
         // The DNG SDK scales only during demosaicing, so scaling is only possible when
         // a mosaic info is available.
         fIsScalable = cfaPatternSize.v != 0 && cfaPatternSize.h != 0;
         fIsXtransImage = fIsScalable ? (cfaPatternSize.v == 6 && cfaPatternSize.h == 6) : false;
     }
@@ skipping 199 matching lines @@
     SkISize sizeFloor = this->onGetScaledDimensions(1.f / std::floor(fullShortEdge / shortEdge));
     SkISize sizeCeil = this->onGetScaledDimensions(1.f / std::ceil(fullShortEdge / shortEdge));
     return sizeFloor == dim || sizeCeil == dim;
 }
 
 SkRawCodec::~SkRawCodec() {}
 
 SkRawCodec::SkRawCodec(SkDngImage* dngImage)
     : INHERITED(dngImage->getImageInfo(), nullptr)
     , fDngImage(dngImage) {}