new maxusb library

[goodfet] / client / USBConfiguration.py

diff --git a/client/USBConfiguration.py b/client/USBConfiguration.py
new file mode 100644 (file)
index 0000000..cadf106
--- /dev/null
+++ b/client/USBConfiguration.py
@@ -0,0 +1,33 @@
+# USBConfiguration.py
+#
+# Contains class definition for USBConfiguration.
+
+class USBConfiguration:
+    def __init__(self, configuration_index, configuration_string, interfaces):
+        self.configuration_index        = configuration_index
+        self.configuration_string       = configuration_string
+        self.configuration_string_index = 0
+        self.interfaces                 = interfaces
+
+    def set_configuration_string_index(self, i):
+        self.configuration_string_index = i
+
+    def get_descriptor(self):
+        interface_descriptors = bytearray()
+        for i in self.interfaces:
+            interface_descriptors += i.get_descriptor()
+
+        total_len = len(interface_descriptors) + 7
+
+        d = bytes([
+                7,          # length of descriptor in bytes
+                2,          # descriptor type 2 == configuration
+                total_len & 0xff,
+                (total_len >> 8) & 0xff,
+                len(self.interfaces),
+                self.configuration_index,
+                self.configuration_string_index
+        ])
+
+        return d + interface_descriptors
+