Add a RawFile object.

This provides support for storing raw data under the transactions
infrastructure.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

lib/newfol/filemanip.py

@@ -424,6 +424,24 @@ class YAMLFile(JSONFile):
     def load(self):
         raise NotImplementedError("Loading arbitrary YAML is not supported.")
 
+class RawFile(FileFormat):
+    """A raw data file.
+
+    This file type stores raw data, not records.  It is provided for wrapping
+    normal file IO in the transaction code.
+    """
+    def store(self, records):
+        """Store the data to this file."""
+        fp = self._open("w")
+        fp.write(records)
+        self._close(fp)
+    def load(self):
+        """Read the contents of this file."""
+        fp = self._open("r")
+        recs = fp.read()
+        self._close(fp)
+        return recs
+
 class FileStorage:
     """A file (or file-like object) in a certain format."""
     def __init__(self, fmt, filename, txnformat=None, options=None):
@@ -438,6 +456,8 @@ class FileStorage:
             self._backend = JSONFile(filename, self._txn, options)
         elif fmt == "yaml":
             self._backend = YAMLFile(filename, self._txn, options)
+        elif fmt == "raw":
+            self._backend = RawFile(filename, self._txn, options)
         else:
             raise ValueError("{0}: not a supported backend".format(fmt))
     @staticmethod