Handle SkStream::rewind properly.

src/images/SkJpegUtility.cpp

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkJpegUtility.h"
 
 /////////////////////////////////////////////////////////////////////
 static void sk_init_source(j_decompress_ptr cinfo) {
     skjpeg_source_mgr*  src = (skjpeg_source_mgr*)cinfo->src;
     src->next_input_byte = (const JOCTET*)src->fBuffer;
     src->bytes_in_buffer = 0;
 #ifdef SK_BUILD_FOR_ANDROID
     src->current_offset = 0;
 #endif
-    src->fStream->rewind();
+    if (!src->fStream->rewind()) {
+        SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
+        cinfo->err->error_exit((j_common_ptr)cinfo);
+    }
 }
 
 #ifdef SK_BUILD_FOR_ANDROID
 static boolean sk_seek_input_data(j_decompress_ptr cinfo, long byte_offset) {
     skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
     size_t bo = (size_t) byte_offset;
 
     if (bo > src->current_offset) {
         (void)src->fStream->skip(bo - src->current_offset);
     } else {
-        src->fStream->rewind();
+        if (!src->fStream->rewind()) {
+            SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
+            cinfo->err->error_exit((j_common_ptr)cinfo);
+            return false;
+        }
         (void)src->fStream->skip(bo);
     }
 
     src->current_offset = bo;
     src->next_input_byte = (const JOCTET*)src->fBuffer;
     src->bytes_in_buffer = 0;
     return true;
 }
 #endif
 
@@ skipping 128 matching lines @@
 void skjpeg_error_exit(j_common_ptr cinfo) {
     skjpeg_error_mgr* error = (skjpeg_error_mgr*)cinfo->err;
 
     (*error->output_message) (cinfo);
 
     /* Let the memory manager delete any temp files before we die */
     jpeg_destroy(cinfo);
 
     longjmp(error->fJmpBuf, -1);
 }