From c346ff180244de682e78f49783eab9b296c79de6 Mon Sep 17 00:00:00 2001
From: Szczepan Zalega <szczepan@nitrokey.com>
Date: Mon, 31 Oct 2016 19:03:30 +0100
Subject: Code refactoring - named magic numbers (2)

Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>
---
 include/device_proto.h     | 19 +++++++++++++------
 include/stick20_commands.h |  6 +++---
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/include/device_proto.h b/include/device_proto.h
index 6bcbcb0..187d25c 100644
--- a/include/device_proto.h
+++ b/include/device_proto.h
@@ -90,12 +90,19 @@ namespace nitrokey {
  *	command_id member in incoming HIDReport structure carries the command
  *	type last used.
  */
-        template<CommandID cmd_id, typename ResponsePayload>
-        struct DeviceResponse {
-            static constexpr auto storage_status_absolute_address = 21; //magic number from firmware
+        namespace DeviceResponseConstants{
+            //magic numbers from firmware
+            static constexpr auto storage_status_absolute_address = 21;
+            static constexpr auto storage_data_absolute_address = storage_status_absolute_address + 5;
             static constexpr auto header_size = 8; //from _zero to last_command_status inclusive
             static constexpr auto footer_size = 4; //crc
-            static constexpr auto boiler_size = header_size + footer_size;
+            static constexpr auto wrapping_size = header_size + footer_size;
+        }
+
+        template<CommandID cmd_id, typename ResponsePayload>
+        struct DeviceResponse {
+            static constexpr auto storage_status_padding_size =
+                DeviceResponseConstants::storage_status_absolute_address - DeviceResponseConstants::header_size;
 
             uint8_t _zero;
             uint8_t device_status;
@@ -104,10 +111,10 @@ namespace nitrokey {
             uint8_t last_command_status;
 
             union {
-                uint8_t _padding[HID_REPORT_SIZE - boiler_size];
+                uint8_t _padding[HID_REPORT_SIZE - DeviceResponseConstants::wrapping_size];
                 ResponsePayload payload;
                 struct {
-                    uint8_t _storage_status_padding[storage_status_absolute_address - header_size];
+                    uint8_t _storage_status_padding[storage_status_padding_size];
                     uint8_t command_counter;
                     uint8_t command_id;
                     uint8_t device_status; //@see stick20::device_status
diff --git a/include/stick20_commands.h b/include/stick20_commands.h
index f816868..139dc63 100644
--- a/include/stick20_commands.h
+++ b/include/stick20_commands.h
@@ -91,9 +91,9 @@ namespace nitrokey {
             };
 
             namespace StorageCommandResponsePayload{
-              static const int OUTPUT_CMD_RESULT_STICK20_STATUS_START = 25 + 1;
-              static const int payload_absolute_begin = 8;
-              static const int padding_size = OUTPUT_CMD_RESULT_STICK20_STATUS_START - payload_absolute_begin;
+                using namespace DeviceResponseConstants;
+              static constexpr auto padding_size =
+                  storage_data_absolute_address - header_size;
               struct TransmissionData{
                   uint8_t _padding[padding_size];
 
-- 
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