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/* Copyright (c) 2008-2009, 2012-2014, The Linux Foundation.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef DIAGCHAR_HDLC
#define DIAGCHAR_HDLC
enum diag_send_state_enum_type {
DIAG_STATE_START,
DIAG_STATE_BUSY,
DIAG_STATE_CRC1,
DIAG_STATE_CRC2,
DIAG_STATE_TERM,
DIAG_STATE_COMPLETE
};
struct diag_send_desc_type {
const void *pkt;
const void *last; /* Address of last byte to send. */
enum diag_send_state_enum_type state;
unsigned char terminate; /* True if this fragment
terminates the packet */
};
struct diag_hdlc_dest_type {
void *dest;
void *dest_last;
/* Below: internal use only */
uint16_t crc;
};
struct diag_hdlc_decode_type {
uint8_t *src_ptr;
unsigned int src_idx;
unsigned int src_size;
uint8_t *dest_ptr;
unsigned int dest_idx;
unsigned int dest_size;
int escaping;
};
void diag_hdlc_encode(struct diag_send_desc_type *src_desc,
struct diag_hdlc_dest_type *enc);
int diag_hdlc_decode(struct diag_hdlc_decode_type *hdlc);
int crc_check(uint8_t *buf, uint16_t len);
#define ESC_CHAR 0x7D
#define ESC_MASK 0x20
#define HDLC_INCOMPLETE 0
#define HDLC_COMPLETE 1
#define HDLC_FOOTER_LEN 3
#endif
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