github.com/ledgerwatch/erigon-lib@v1.0.0/common/bytes.go (about)

     1  /*
     2     Copyright 2021 The Erigon contributors
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package common
    18  
    19  import (
    20  	"fmt"
    21  )
    22  
    23  func ByteCount(b uint64) string {
    24  	const unit = 1024
    25  	if b < unit {
    26  		return fmt.Sprintf("%dB", b)
    27  	}
    28  	bGb, exp := MBToGB(b)
    29  	return fmt.Sprintf("%.1f%cB", bGb, "KMGTPE"[exp])
    30  }
    31  
    32  func MBToGB(b uint64) (float64, int) {
    33  	const unit = 1024
    34  	if b < unit {
    35  		return float64(b), 0
    36  	}
    37  
    38  	div, exp := uint64(unit), 0
    39  	for n := b / unit; n >= unit; n /= unit {
    40  		div *= unit
    41  		exp++
    42  	}
    43  
    44  	return float64(b) / float64(div), exp
    45  }
    46  
    47  func Copy(b []byte) []byte {
    48  	if b == nil {
    49  		return nil
    50  	}
    51  	c := make([]byte, len(b))
    52  	copy(c, b)
    53  	return c
    54  }
    55  
    56  func EnsureEnoughSize(in []byte, size int) []byte {
    57  	if cap(in) < size {
    58  		newBuf := make([]byte, size)
    59  		copy(newBuf, in)
    60  		return newBuf
    61  	}
    62  	return in[:size] // Reuse the space if it has enough capacity
    63  }
    64  
    65  func BitLenToByteLen(bitLen int) (byteLen int) {
    66  	return (bitLen + 7) / 8
    67  }