c4d3356b6e
The new Petrel protocol uses a simple data compression scheme to reduce the transfer times. The data is broken up into blocks of 32 bytes each. Each block except the first is XOR'ed with the previous block, creating large runs of zeros due to the similarity of the data. The zeros are then run-length encoded (RLE) to save space.
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2013 Jef Driesen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef SHEARWATER_COMMON_H
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#define SHEARWATER_COMMON_H
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#include "device-private.h"
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#include "serial.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct shearwater_common_device_t {
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dc_device_t base;
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serial_t *port;
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} shearwater_common_device_t;
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dc_status_t
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shearwater_common_open (shearwater_common_device_t *device, dc_context_t *context, const char *name);
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dc_status_t
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shearwater_common_close (shearwater_common_device_t *device);
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dc_status_t
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shearwater_common_download (shearwater_common_device_t *device, dc_buffer_t *buffer, unsigned int address, unsigned int size, unsigned int compression);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* SHEARWATER_COMMON_H */
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