AU: SplitWriter class for parsing our full update files.

src/platform/update_engine/delta_performer.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__
 
 #include <inttypes.h>
 #include <vector>
 #include <google/protobuf/repeated_field.h>
@@ skipping 12 matching lines @@
         manifest_valid_(false),
         next_operation_(0),
         buffer_offset_(0),
         block_size_(0) {}
   // flags and mode ignored. Once Close()d, a DeltaPerformer can't be
   // Open()ed again.
   int Open(const char* path, int flags, mode_t mode);
 
   // Wrapper around write. Returns bytes written on success or
   // -errno on error.
-  int Write(const void* bytes, size_t count);
+  ssize_t Write(const void* bytes, size_t count);
 
   // Wrapper around close. Returns 0 on success or -errno on error.
   int Close();
   
   // Converts an ordered collection of Extent objects which contain data of
   // length full_length to a comma-separated string. For each Extent, the
   // string will have the start offset and then the length in bytes.
   // The length value of the last extent in the string may be short, since
   // the full length of all extents in the string is capped to full_length.
   // Also, an extent starting at kSparseHole, appears as -1 in the string.
@@ skipping 45 matching lines @@
   
   // The block size (parsed from the manifest).
   uint32_t block_size_;
   
   DISALLOW_COPY_AND_ASSIGN(DeltaPerformer);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__