043be07af4
Some devices do not appear to set the ringbuffer pointers to their normal empty values (e.g. pointing outside the ringbuffer memory). In that case, there appears to be a single entry. But since that entry contains uninitialized memory (e.g. all 0xFF bytes), we are able to detect this special situation.
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2008 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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#include "array.h"
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void
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array_reverse_bytes (unsigned char data[], unsigned int size)
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{
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for (unsigned int i = 0; i < size / 2; ++i) {
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unsigned char hlp = data[i];
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data[i] = data[size - 1 - i];
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data[size - 1 - i] = hlp;
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}
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}
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void
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array_reverse_bits (unsigned char data[], unsigned int size)
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{
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for (unsigned int i = 0; i < size; ++i) {
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unsigned char j = 0;
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j = (data[i] & 0x01) << 7;
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j += (data[i] & 0x02) << 5;
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j += (data[i] & 0x04) << 3;
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j += (data[i] & 0x08) << 1;
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j += (data[i] & 0x10) >> 1;
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j += (data[i] & 0x20) >> 3;
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j += (data[i] & 0x40) >> 5;
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j += (data[i] & 0x80) >> 7;
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data[i] = j;
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}
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}
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int
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array_isequal (const unsigned char data[], unsigned int size, unsigned char value)
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{
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for (unsigned int i = 0; i < size; ++i) {
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if (data[i] != value)
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return 0;
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}
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return 1;
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}
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unsigned int
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array_uint32_be (const unsigned char data[])
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{
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return (data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3];
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}
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unsigned int
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array_uint32_le (const unsigned char data[])
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{
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return data[0] + (data[1] << 8) + (data[2] << 16) + (data[3] << 24);
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}
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unsigned int
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array_uint24_be (const unsigned char data[])
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{
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return (data[0] << 16) + (data[1] << 8) + data[2];
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}
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unsigned int
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array_uint24_le (const unsigned char data[])
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{
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return data[0] + (data[1] << 8) + (data[2] << 16);
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}
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unsigned short
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array_uint16_be (const unsigned char data[])
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{
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return (data[0] << 8) + data[1];
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}
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unsigned short
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array_uint16_le (const unsigned char data[])
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{
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return data[0] + (data[1] << 8);
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}
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