SkStream/Priv cleanups

src/core/SkStreamPriv.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkStreamPriv_DEFINED
 #define SkStreamPriv_DEFINED
 
-class SkAutoMalloc;
+class SkData;
 class SkStream;
-class SkStreamRewindable;
-class SkData;
-
-/**
- *  Copy the provided stream to memory allocated by storage.
- *  Used by SkImageDecoder_libbmp and SkImageDecoder_libico.
- *  @param storage Allocator to hold the memory. Will be reset to be large
- *      enough to hold the entire stream. Upon successful return,
- *      storage->get() will point to data holding the SkStream's entire
- *      contents.
- *  @param stream SkStream to be copied into storage.
- *  @return size_t Total number of bytes in the SkStream, which is also the
- *      number of bytes pointed to by storage->get(). Returns 0 on failure.
- */
-size_t SkCopyStreamToStorage(SkAutoMalloc* storage, SkStream* stream);
+class SkWStream;
 
 /**
  *  Copy the provided stream to an SkData variable.
+ *
+ *  Note: Assumes the stream is at the beginning. If it has a length,
+ *  but is not at the beginning, this call will fail (return NULL).
+ *
  *  @param stream SkStream to be copied into data.
  *  @return SkData* The resulting SkData after the copy. This data
  *      will have a ref count of one upon return and belongs to the
  *      caller. Returns nullptr on failure.
  */
-SkData *SkCopyStreamToData(SkStream* stream);
-
-/**
- *  Attempt to convert this stream to a StreamRewindable in the
- *  cheapest possible manner (calling duplicate() if possible, and
- *  otherwise allocating memory for a copy).  The position of the
- *  input stream is left in an indeterminate state.
- */
-SkStreamRewindable* SkStreamRewindableFromSkStream(SkStream* stream);
+SkData* SkCopyStreamToData(SkStream* stream);
 
 /**
  *  Copies the input stream from the current position to the end.
  *  Does not rewind the input stream.
  */
 bool SkStreamCopy(SkWStream* out, SkStream* input);
 
 #endif  // SkStreamPriv_DEFINED