Harald Welte | 99ac1f3 | 2016-12-23 22:07:51 +0100 | [diff] [blame] | 1 | /* Copyright (c) 2008-2009, 2012-2014, The Linux Foundation. |
| 2 | * All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #ifndef DIAGCHAR_HDLC |
| 15 | #define DIAGCHAR_HDLC |
| 16 | |
| 17 | enum diag_send_state_enum_type { |
| 18 | DIAG_STATE_START, |
| 19 | DIAG_STATE_BUSY, |
| 20 | DIAG_STATE_CRC1, |
| 21 | DIAG_STATE_CRC2, |
| 22 | DIAG_STATE_TERM, |
| 23 | DIAG_STATE_COMPLETE |
| 24 | }; |
| 25 | |
| 26 | struct diag_send_desc_type { |
| 27 | const void *pkt; |
| 28 | const void *last; /* Address of last byte to send. */ |
| 29 | enum diag_send_state_enum_type state; |
| 30 | unsigned char terminate; /* True if this fragment |
| 31 | terminates the packet */ |
| 32 | }; |
| 33 | |
| 34 | struct diag_hdlc_dest_type { |
| 35 | void *dest; |
| 36 | void *dest_last; |
| 37 | /* Below: internal use only */ |
| 38 | uint16_t crc; |
| 39 | }; |
| 40 | |
| 41 | struct diag_hdlc_decode_type { |
| 42 | uint8_t *src_ptr; |
| 43 | unsigned int src_idx; |
| 44 | unsigned int src_size; |
| 45 | uint8_t *dest_ptr; |
| 46 | unsigned int dest_idx; |
| 47 | unsigned int dest_size; |
| 48 | int escaping; |
| 49 | |
| 50 | }; |
| 51 | |
| 52 | void diag_hdlc_encode(struct diag_send_desc_type *src_desc, |
| 53 | struct diag_hdlc_dest_type *enc); |
| 54 | |
| 55 | int diag_hdlc_decode(struct diag_hdlc_decode_type *hdlc); |
| 56 | |
| 57 | int crc_check(uint8_t *buf, uint16_t len); |
| 58 | |
| 59 | #define ESC_CHAR 0x7D |
| 60 | #define ESC_MASK 0x20 |
| 61 | |
| 62 | #define HDLC_INCOMPLETE 0 |
| 63 | #define HDLC_COMPLETE 1 |
| 64 | |
| 65 | #define HDLC_FOOTER_LEN 3 |
| 66 | #endif |