Update code to use helper function for better readability/searching.

src/images/SkImageDecoder_libico.cpp

 
 /*
  * Copyright 2006 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 "SkImageDecoder.h"
@@ skipping 57 matching lines @@
     //  Add 4 to ensure that it is still a multiple of 4.
     if (4 == bitCount && (w & 0x1)) {
         return (w + 1) << 2;
     }
     //  Otherwise return 0, which will allow it to be calculated automatically.
     return 0;
 }
 
 bool SkICOImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode)
 {
-    size_t length = stream->read(NULL, 0);
+    size_t length = stream->getLength();
     SkAutoMalloc autoMal(length);
     unsigned char* buf = (unsigned char*)autoMal.get();
     if (stream->read((void*)buf, length) != length) {
         return false;
     }
 
     //these should always be the same - should i use for error checking? - what about files that have some
     //incorrect values, but still decode properly?
     int reserved = read2Bytes(buf, 0);    // 0
     int type = read2Bytes(buf, 2);        // 1
@@ skipping 295 matching lines @@
     int reserved = read2Bytes(buf, 0);
     int type = read2Bytes(buf, 2);
     if (reserved != 0 || type != 1) {
         // This stream does not represent an ICO image.
         return NULL;
     }
     return SkNEW(SkICOImageDecoder);
 }
 
 static SkTRegistry<SkImageDecoder*, SkStream*> gReg(sk_libico_dfactory);