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