82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
/*
|
|
* Copyright (C) 2024 Amlogic Corporation.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
*
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "BitsMap.h"
|
|
#include <string.h>
|
|
|
|
#define BYTE_IDX(idx) (idx >> 3)
|
|
#define BIT_OFFSET(idx) (idx & 0x7)
|
|
|
|
|
|
BitsMap::BitsMap(int bits) {
|
|
mLen = BYTE_IDX(bits) + 1;
|
|
mBits = new char[mLen];
|
|
if (mBits != NULL)
|
|
memset(mBits, 0, mLen);
|
|
}
|
|
|
|
BitsMap::~BitsMap() {
|
|
if (mBits != NULL)
|
|
delete [] mBits;
|
|
}
|
|
|
|
int BitsMap::getZeroBit() {
|
|
int i = 0;
|
|
|
|
if (mBits == NULL)
|
|
return -1;
|
|
|
|
for (; i < mLen; i++) {
|
|
if (mBits[i] == 0xFF) {
|
|
continue;
|
|
}
|
|
|
|
char byteval = mBits[i];
|
|
int idx = 0;
|
|
|
|
if ((byteval & 0xF) == 0xF) {
|
|
byteval >>= 4;
|
|
idx += 4;
|
|
}
|
|
if ((byteval & 0x3) == 0x3) {
|
|
byteval >>= 2;
|
|
idx += 2;
|
|
}
|
|
if ((byteval & 0x1) == 0x1) {
|
|
byteval >>= 1;
|
|
idx += 1;
|
|
}
|
|
|
|
idx += i * 8;
|
|
return idx;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int BitsMap::setBit(int idx) {
|
|
if (mBits != NULL)
|
|
mBits[BYTE_IDX(idx)] |= 1 << BIT_OFFSET(idx);
|
|
return 0;
|
|
}
|
|
|
|
int BitsMap::clearBit(int idx) {
|
|
if (mBits != NULL)
|
|
mBits[BYTE_IDX(idx)] &= ~(1 << BIT_OFFSET(idx));
|
|
return 0;
|
|
}
|