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| author | Szczepan Zalega <szczepan@nitrokey.com> | 2016-10-31 18:40:48 +0100 |
|---|---|---|
| committer | Szczepan Zalega <szczepan@nitrokey.com> | 2016-11-26 18:56:27 +0100 |
| commit | ca130e790ecc4e4502eb39e1ab550348eae9bc54 (patch) | |
| tree | 241b4b8d15ebcf8f25362305b66c186842c29f0a /include | |
| parent | b540266c4ce17b640724bc09275e45e15a53d707 (diff) | |
| download | libnitrokey-ca130e790ecc4e4502eb39e1ab550348eae9bc54.tar.gz libnitrokey-ca130e790ecc4e4502eb39e1ab550348eae9bc54.tar.bz2 | |
Code refactoring - named magic numbers
Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/device_proto.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/include/device_proto.h b/include/device_proto.h index 037451a..6bcbcb0 100644 --- a/include/device_proto.h +++ b/include/device_proto.h @@ -92,22 +92,29 @@ namespace nitrokey { */ template<CommandID cmd_id, typename ResponsePayload> struct DeviceResponse { + static constexpr auto storage_status_absolute_address = 21; //magic number from firmware + 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; + uint8_t _zero; uint8_t device_status; uint8_t command_id; // originally last_command_type uint32_t last_command_crc; uint8_t last_command_status; + union { - uint8_t _padding[HID_REPORT_SIZE - 12]; + uint8_t _padding[HID_REPORT_SIZE - boiler_size]; ResponsePayload payload; struct { - uint8_t _storage_status_padding[20 - 8 + 1]; //starts on 20th byte minus already 8 used + zero byte + uint8_t _storage_status_padding[storage_status_absolute_address - header_size]; uint8_t command_counter; uint8_t command_id; uint8_t device_status; //@see stick20::device_status uint8_t progress_bar_value; } __packed storage_status; } __packed; + uint32_t crc; void initialize() { bzero(this, sizeof *this); } @@ -120,9 +127,7 @@ namespace nitrokey { } void update_CRC() { crc = calculate_CRC(); } - bool isCRCcorrect() const { return crc == calculate_CRC(); } - bool isValid() const { // return !_zero && payload.isValid() && isCRCcorrect() && // command_id == (uint8_t)(cmd_id); |