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apps/documents/utils.py

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+import os
+import tempfile
+
+from documents.conf.settings import TEMPORARY_DIRECTORY
+
+           
+#http://stackoverflow.com/questions/123198/how-do-i-copy-a-file-in-python
+def copyfile(source, dest, buffer_size=1024*1024):
+    """
+    Copy a file from source to dest. source and dest
+    can either be strings or any object with a read or
+    write method, like StringIO for example.
+    """
+    if not hasattr(source, 'read'):
+        source = open(source, 'rb')
+    if not hasattr(dest, 'write'):
+        dest = open(dest, 'wb')
+
+    while 1:
+        copy_buffer = source.read(buffer_size)
+        if copy_buffer:
+            dest.write(copy_buffer)
+        else:
+            break
+
+    source.close()
+    dest.close()
+
+
+def from_descriptor_to_tempfile(input_descriptor, filename, buffer_size=1024*1024):
+    path = os.path.join(TEMPORARY_DIRECTORY, filename)
+    
+    output_descriptor = open(path, 'wb')
+    
+    while 1:
+        copy_buffer = input_descriptor.read(buffer_size)
+        if copy_buffer:
+            output_descriptor.write(copy_buffer)
+        else:
+            break
+
+    input_descriptor.close()
+    output_descriptor.close()
+    return path
+
+
+
+def from_descriptor_to_new_tempfile(input_descriptor, buffer_size=1024*1024):
+    output_descriptor, tmp_filename = tempfile.mkstemp()
+    
+    while 1:
+        copy_buffer = input_descriptor.read(buffer_size)
+        if copy_buffer:
+            #output_descriptor.write(copy_buffer)
+            os.write(output_descriptor, copy_buffer)
+        else:
+            break
+
+    input_descriptor.close()
+    os.close(output_descriptor)
+    return tmp_filename