Catch invalid images in get_images_from_skps

src/codec/SkJpegCodec.cpp

 /*
  * Copyright 2015 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 "SkMSAN.h"
 #include "SkJpegCodec.h"
@@ skipping 484 matching lines @@
 
         if (fSwizzler) {
             // use swizzler to sample row
             fSwizzler->swizzle(dst, dstRow);
             dst = SkTAddOffset<JSAMPLE>(dst, dstRowBytes);
         } else {
             dstRow = SkTAddOffset<JSAMPLE>(dstRow, dstRowBytes);
         }
     }
 
-    return kSuccess;
+    return kUnimplemented;
 }
 
 void SkJpegCodec::initializeSwizzler(const SkImageInfo& dstInfo, const Options& options) {
     SkSwizzler::SrcConfig srcConfig = SkSwizzler::kUnknown;
     if (JCS_CMYK == fDecoderMgr->dinfo()->out_color_space) {
         srcConfig = SkSwizzler::kCMYK;
     } else {
         // If the out_color_space is not CMYK, the only reason we would need a swizzler is
         // for sampling and/or subsetting.
         switch (dstInfo.colorType()) {
@@ skipping 373 matching lines @@
 
         JDIMENSION linesRead = jpeg_read_raw_data(dinfo, yuv, numRowsPerBlock);
         if (linesRead < remainingRows) {
             // FIXME: Handle incomplete YUV decodes without signalling an error.
             return kInvalidInput;
         }
     }
 
     return kSuccess;
 }