github.com/suiyunonghen/dxcommonlib@v0.0.0-20190612012041-7f8547a81a67/DxBits.go (about)

     1  package DxCommonLib
     2  
     3  import (
     4  	"unsafe"
     5  )
     6  
     7  //用来存放位
     8  type  DxBits struct{
     9  	buffer	[]byte
    10  	fsize	uint				//存放的bit位数是多少
    11  }
    12  
    13  func (bt *DxBits)Count()uint  {
    14  	return bt.fsize
    15  }
    16  
    17  //选中的位的个数
    18  func (bt *DxBits)CheckedCount()uint  {
    19  	if bt.fsize == 0{
    20  		return 0
    21  	}
    22  	result := uint(0)
    23  	for _,v := range bt.buffer{
    24  		for i := 0;i<8;i++{
    25  			realv := byte(1 << uint(i))
    26  			if v & realv == realv{
    27  				result++
    28  			}
    29  		}
    30  	}
    31  	return result
    32  }
    33  
    34  func (bt *DxBits)ReSet(bsize uint)  {
    35  	if bsize == 0{
    36  		bt.buffer = nil
    37  		bt.fsize = 0
    38  		return
    39  	}
    40  	if bt.fsize == bsize{
    41  		return
    42  	}
    43  	bt.fsize = bsize
    44  	buflen := bt.fsize / 8
    45  	if bt.fsize % 8 != 0{
    46  		buflen += 1
    47  	}
    48  	bt.buffer = make([]byte,buflen)
    49  }
    50  
    51  func (bt *DxBits)Clear()  {
    52  	for i := 0;i<len(bt.buffer);i++{
    53  		bt.buffer[i] = 0
    54  	}
    55  }
    56  
    57  func (bt *DxBits)ReSetByInt32(v int32)  {
    58  	bt.ReSet(32)
    59  	*(*int32)(unsafe.Pointer(&bt.buffer[0])) = v
    60  }
    61  
    62  func (bt *DxBits)ReSetByInt64(v int64)  {
    63  	bt.ReSet(64)
    64  	*(*int64)(unsafe.Pointer(&bt.buffer[0])) = v
    65  }
    66  
    67  func (bt *DxBits)Bits(index uint)bool  {
    68  	if index < bt.fsize{
    69  		btindex := index / 8
    70  		index = index % 8
    71  		realv := byte(1 << uint(index))
    72  		return bt.buffer[btindex] & realv == realv
    73  	}
    74  	return false
    75  }
    76  
    77  func (bt *DxBits)SetBits(index uint,v bool)  {
    78  	if index < bt.fsize{
    79  		btindex := index / 8
    80  		index = index % 8
    81  		if v {
    82  			realv := byte(1 << uint(index))
    83  			bt.buffer[btindex] = bt.buffer[btindex] | realv
    84  		}else{
    85  			realv := byte(1 << uint(index))
    86  			realv = ^realv
    87  			bt.buffer[btindex] = bt.buffer[btindex] & realv
    88  		}
    89  	}
    90  }
    91  
    92  //将指定的位取反，如果指定的位为-1，则将全部的位各自取反，1变0,0变1
    93  func (bt *DxBits)NotBits(index int){
    94  	if index < 0{
    95  		for idx,v := range bt.buffer{
    96  			for i := 0;i<8;i++{
    97  				realv := byte(1 << uint(i))
    98  				if v & realv == realv{
    99  					realv = ^realv
   100  					v = v & realv
   101  				}else{
   102  					v = v | realv
   103  				}
   104  			}
   105  			bt.buffer[idx] = v
   106  		}
   107  	}else{
   108  		btindex := index / 8
   109  		index = index % 8
   110  		realv := byte(1 << uint(index))
   111  		oldBitValid := bt.buffer[btindex] & realv == realv
   112  		if oldBitValid{
   113  			realv = ^realv
   114  			bt.buffer[btindex] = bt.buffer[btindex] & realv
   115  		}else{
   116  			bt.buffer[btindex] = bt.buffer[btindex] | realv
   117  		}
   118  	}
   119  }
   120  
   121  func (bt *DxBits)AsUInt64()uint64  {
   122  	bflen := len(bt.buffer)
   123  	if bflen > 0{
   124  		result := uint(bt.buffer[0])
   125  		for i := 1;i<bflen;i++{
   126  			if i == 8{
   127  				break
   128  			}
   129  			result = result | uint(bt.buffer[i]) << uint(8 * i)
   130  		}
   131  		return uint64(result)
   132  	}
   133  	return 0
   134  }
   135  
   136  func (bt *DxBits)AsInt64()int64  {
   137  	return int64(bt.AsUInt64())
   138  }
   139  
   140  func (bt *DxBits)AsUInt32()uint32  {
   141  	bflen := len(bt.buffer)
   142  	if bflen > 0{
   143  		result := uint(bt.buffer[0])
   144  		for i := 1;i<bflen;i++{
   145  			if i == 4{
   146  				break
   147  			}
   148  			result = result | uint(bt.buffer[i]) << uint(8 * i)
   149  		}
   150  		return uint32(result)
   151  	}
   152  	return 0
   153  }
   154  
   155  func (bt *DxBits)AsInt32()int32  {
   156  	return int32(bt.AsUInt32())
   157  }