1 files changed, 69 insertions, 0 deletions

diff --git a/libmat/hachoir_editor/field.py b/libmat/hachoir_editor/field.py
new file mode 100644
index 0000000..6b1efe3
--- /dev/null
+++ b/libmat/hachoir_editor/field.py
@@ -0,0 +1,69 @@
+from hachoir_core.error import HachoirError
+from hachoir_core.field import joinPath, MissingField
+
+class EditorError(HachoirError):
+    pass
+
+class FakeField(object):
+    """
+    This class have API looks similar to Field API, but objects don't contain
+    any value: all values are _computed_ by parent methods.
+
+    Example: FakeField(editor, "abc").size calls editor._getFieldSize("abc").
+    """
+    is_field_set = False
+
+    def __init__(self, parent, name):
+        self._parent = parent
+        self._name = name
+
+    def _getPath(self):
+        return joinPath(self._parent.path, self._name)
+    path = property(_getPath)
+
+    def _getName(self):
+        return self._name
+    name = property(_getName)
+
+    def _getAddress(self):
+        return self._parent._getFieldAddress(self._name)
+    address = property(_getAddress)
+
+    def _getSize(self):
+        return self._parent.input[self._name].size
+    size = property(_getSize)
+
+    def _getValue(self):
+        return self._parent.input[self._name].value
+    value = property(_getValue)
+
+    def createDisplay(self):
+        # TODO: Returns new value if field is altered
+        return self._parent.input[self._name].display
+    display = property(createDisplay)
+
+    def _getParent(self):
+        return self._parent
+    parent = property(_getParent)
+
+    def hasValue(self):
+        return self._parent.input[self._name].hasValue()
+
+    def __getitem__(self, key):
+        # TODO: Implement this function!
+        raise MissingField(self, key)
+
+    def _isAltered(self):
+        return False
+    is_altered = property(_isAltered)
+
+    def writeInto(self, output):
+        size = self.size
+        addr = self._parent._getFieldInputAddress(self._name)
+        input = self._parent.input
+        stream = input.stream
+        if size % 8:
+            output.copyBitsFrom(stream, addr, size, input.endian)
+        else:
+            output.copyBytesFrom(stream, addr, size//8)
+