leaf_alts.go

Documentation: net/netip

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Stuff that exists in std, but we can't use due to being a dependency
     6  // of net, for go/build deps_test policy reasons.
     7  
     8  package netip
     9  
    10  func beUint64(b []byte) uint64 {
    11  	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
    12  	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
    13  		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
    14  }
    15  
    16  func bePutUint64(b []byte, v uint64) {
    17  	_ = b[7] // early bounds check to guarantee safety of writes below
    18  	b[0] = byte(v >> 56)
    19  	b[1] = byte(v >> 48)
    20  	b[2] = byte(v >> 40)
    21  	b[3] = byte(v >> 32)
    22  	b[4] = byte(v >> 24)
    23  	b[5] = byte(v >> 16)
    24  	b[6] = byte(v >> 8)
    25  	b[7] = byte(v)
    26  }
    27  
    28  func bePutUint32(b []byte, v uint32) {
    29  	_ = b[3] // early bounds check to guarantee safety of writes below
    30  	b[0] = byte(v >> 24)
    31  	b[1] = byte(v >> 16)
    32  	b[2] = byte(v >> 8)
    33  	b[3] = byte(v)
    34  }
    35  
    36  func leUint16(b []byte) uint16 {
    37  	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
    38  	return uint16(b[0]) | uint16(b[1])<<8
    39  }
    40  
    41  func lePutUint16(b []byte, v uint16) {
    42  	_ = b[1] // early bounds check to guarantee safety of writes below
    43  	b[0] = byte(v)
    44  	b[1] = byte(v >> 8)
    45  }
    46
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