diff options
Diffstat (limited to 'drivers/char/diag/diagchar_hdlc.c')
| -rw-r--r-- | drivers/char/diag/diagchar_hdlc.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/drivers/char/diag/diagchar_hdlc.c b/drivers/char/diag/diagchar_hdlc.c deleted file mode 100644 index ef57d52..0000000 --- a/drivers/char/diag/diagchar_hdlc.c +++ /dev/null @@ -1,223 +0,0 @@ -/* Copyright (c) 2008-2009, Code Aurora Forum. 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. - * - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/cdev.h> -#include <linux/fs.h> -#include <linux/device.h> -#include <linux/uaccess.h> -#include <linux/crc-ccitt.h> -#include "diagchar_hdlc.h" - - -MODULE_LICENSE("GPL v2"); - -#define CRC_16_L_SEED 0xFFFF - -#define CRC_16_L_STEP(xx_crc, xx_c) \ - crc_ccitt_byte(xx_crc, xx_c) - -void diag_hdlc_encode(struct diag_send_desc_type *src_desc, - struct diag_hdlc_dest_type *enc) -{ - uint8_t *dest; - uint8_t *dest_last; - const uint8_t *src; - const uint8_t *src_last; - uint16_t crc; - unsigned char src_byte = 0; - enum diag_send_state_enum_type state; - unsigned int used = 0; - - if (src_desc && enc) { - - /* Copy parts to local variables. */ - src = src_desc->pkt; - src_last = src_desc->last; - state = src_desc->state; - dest = enc->dest; - dest_last = enc->dest_last; - - if (state == DIAG_STATE_START) { - crc = CRC_16_L_SEED; - state++; - } else { - /* Get a local copy of the CRC */ - crc = enc->crc; - } - - /* dest or dest_last may be NULL to trigger a - state transition only */ - if (dest && dest_last) { - /* This condition needs to include the possibility - of 2 dest bytes for an escaped byte */ - while (src <= src_last && dest <= dest_last) { - - src_byte = *src++; - - if ((src_byte == CONTROL_CHAR) || - (src_byte == ESC_CHAR)) { - - /* If the escape character is not the - last byte */ - if (dest != dest_last) { - crc = CRC_16_L_STEP(crc, - src_byte); - - *dest++ = ESC_CHAR; - used++; - - *dest++ = src_byte - ^ ESC_MASK; - used++; - } else { - - src--; - break; - } - - } else { - crc = CRC_16_L_STEP(crc, src_byte); - *dest++ = src_byte; - used++; - } - } - - if (src > src_last) { - - if (state == DIAG_STATE_BUSY) { - if (src_desc->terminate) { - crc = ~crc; - state++; - } else { - /* Done with fragment */ - state = DIAG_STATE_COMPLETE; - } - } - - while (dest <= dest_last && - state >= DIAG_STATE_CRC1 && - state < DIAG_STATE_TERM) { - /* Encode a byte of the CRC next */ - src_byte = crc & 0xFF; - - if ((src_byte == CONTROL_CHAR) - || (src_byte == ESC_CHAR)) { - - if (dest != dest_last) { - - *dest++ = ESC_CHAR; - used++; - *dest++ = src_byte ^ - ESC_MASK; - used++; - - crc >>= 8; - } else { - - break; - } - } else { - - crc >>= 8; - *dest++ = src_byte; - used++; - } - - state++; - } - - if (state == DIAG_STATE_TERM) { - if (dest_last >= dest) { - *dest++ = CONTROL_CHAR; - used++; - state++; /* Complete */ - } - } - } - } - /* Copy local variables back into the encode structure. */ - - enc->dest = dest; - enc->dest_last = dest_last; - enc->crc = crc; - src_desc->pkt = src; - src_desc->last = src_last; - src_desc->state = state; - } - - return; -} - - -int diag_hdlc_decode(struct diag_hdlc_decode_type *hdlc) -{ - uint8_t *src_ptr = NULL, *dest_ptr = NULL; - unsigned int src_length = 0, dest_length = 0; - - unsigned int len = 0; - unsigned int i; - uint8_t src_byte; - - int pkt_bnd = 0; - - if (hdlc && hdlc->src_ptr && hdlc->dest_ptr && - (hdlc->src_size - hdlc->src_idx > 0) && - (hdlc->dest_size - hdlc->dest_idx > 0)) { - - src_ptr = hdlc->src_ptr; - src_ptr = &src_ptr[hdlc->src_idx]; - src_length = hdlc->src_size - hdlc->src_idx; - - dest_ptr = hdlc->dest_ptr; - dest_ptr = &dest_ptr[hdlc->dest_idx]; - dest_length = hdlc->dest_size - hdlc->dest_idx; - - for (i = 0; i < src_length; i++) { - - src_byte = src_ptr[i]; - - if (hdlc->escaping) { - dest_ptr[len++] = src_byte ^ ESC_MASK; - hdlc->escaping = 0; - } else if (src_byte == ESC_CHAR) { - if (i == (src_length - 1)) { - hdlc->escaping = 1; - i++; - break; - } else { - dest_ptr[len++] = src_ptr[++i] - ^ ESC_MASK; - } - } else if (src_byte == CONTROL_CHAR) { - dest_ptr[len++] = src_byte; - pkt_bnd = 1; - i++; - break; - } else { - dest_ptr[len++] = src_byte; - } - - if (len >= dest_length) { - i++; - break; - } - } - - hdlc->src_idx += i; - hdlc->dest_idx += len; - } - - return pkt_bnd; -} |