Rename commands::COMMAND_LEN to device::RESPONSE_DATA_LEN

Previously, we had the device::REQUEST_DATA_LEN constant for the size of
the raw data in the request, and the commands::COMMAND_LEN constant for
the size of the raw data in the response.  This patch renames
commands::COMMAND_LEN to device::RESPONSE_DATA_LEN for consistency.  It
also introduces the {Request,Response}Data type aliases for [u8;
{REQUEST,RESPONSE}_DATA_LEN].

2 files changed, 9 insertions, 7 deletions

diff --git a/src/commands.rs b/src/commands.rs
index 3a7d16a..d05423e 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -8,8 +8,6 @@ use serde::{Deserialize, Serialize};
 
 use crate::device::CommandStatus;
 
-pub const COMMAND_LEN: usize = 53;
-
 enum_cmd! {
     #[derive(Clone, Copy, Debug, PartialEq)]
     pub enum CommandId {
diff --git a/src/device.rs b/src/device.rs
index fc119d5..b25cfb7 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -6,7 +6,7 @@ use serde_big_array::big_array;
 use usb_device::bus::{UsbBus, UsbBusAllocator};
 use usb_device::device::{UsbDevice, UsbDeviceBuilder, UsbVidPid};
 
-use crate::commands::{CommandId, COMMAND_LEN};
+use crate::commands::CommandId;
 use crate::crc::Crc;
 use crate::hid::{HidDevice, Protocol, ReportType, Subclass};
 use crate::util::TryFrom;
@@ -16,6 +16,7 @@ const PID_NITROKEY_PRO: u16 = 0x4108;
 
 const REPORT_LEN: usize = 64;
 const REQUEST_DATA_LEN: usize = REPORT_LEN - 5;
+const RESPONSE_DATA_LEN: usize = REPORT_LEN - 11;
 const REPORT_DESCRIPTOR: &[u8] = &[
     0x05, 0x01, 0x09, 0x06, 0xA1, 0x01, 0x05, 0x07, 0x19, 0xE0, 0x29, 0xE7, 0x15, 0x00, 0x25, 0x01,
     0x75, 0x01, 0x95, 0x08, 0x81, 0x02, 0x95, 0x01, 0x75, 0x08, 0x81, 0x03, 0x95, 0x05, 0x75, 0x01,
@@ -24,7 +25,10 @@ const REPORT_DESCRIPTOR: &[u8] = &[
     0x75, 0x08, 0x95, 0x40, 0xB1, 0x02, 0xC0,
 ];
 
-big_array! { BigArray; COMMAND_LEN, REQUEST_DATA_LEN, }
+pub type RequestData = [u8; REQUEST_DATA_LEN];
+pub type ResponseData = [u8; RESPONSE_DATA_LEN];
+
+big_array! { BigArray; RESPONSE_DATA_LEN, REQUEST_DATA_LEN, }
 
 enum_u8! {
     #[derive(Clone, Copy, Debug, PartialEq)]
@@ -57,7 +61,7 @@ enum_u8! {
 struct Request {
     pub command_id: u8,
     #[serde(with = "BigArray")]
-    pub data: [u8; REQUEST_DATA_LEN],
+    pub data: RequestData,
     pub crc: u32,
 }
 
@@ -68,7 +72,7 @@ struct Response {
     pub last_crc: u32,
     pub command_status: CommandStatus,
     #[serde(with = "BigArray")]
-    pub data: [u8; COMMAND_LEN],
+    pub data: ResponseData,
     pub crc: u32,
 }
 
@@ -79,7 +83,7 @@ impl Response {
             command_id,
             last_crc,
             command_status: CommandStatus::NotSupported,
-            data: [0; COMMAND_LEN],
+            data: [0; RESPONSE_DATA_LEN],
             crc: 0,
         }
     }