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320c4a6448
For #69536 Change-Id: I2d7b6e7b9932d0f0f582a5ab0bb871395dc2a1e8 Reviewed-on: https://go-review.googlesource.com/c/go/+/626675 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net> Reviewed-by: Roland Shoemaker <roland@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Auto-Submit: Filippo Valsorda <filippo@golang.org>
149 lines
3.5 KiB
Go
149 lines
3.5 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package byteorder provides functions for decoding and encoding
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// little and big endian integer types from/to byte slices.
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package byteorder
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func LEUint16(b []byte) uint16 {
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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint16(b[0]) | uint16(b[1])<<8
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}
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func LEPutUint16(b []byte, v uint16) {
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_ = b[1] // early bounds check to guarantee safety of writes below
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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}
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func LEAppendUint16(b []byte, v uint16) []byte {
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return append(b,
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byte(v),
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byte(v>>8),
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)
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}
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func LEUint32(b []byte) uint32 {
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
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}
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func LEPutUint32(b []byte, v uint32) {
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_ = b[3] // early bounds check to guarantee safety of writes below
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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}
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func LEAppendUint32(b []byte, v uint32) []byte {
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return append(b,
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byte(v),
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byte(v>>8),
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byte(v>>16),
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byte(v>>24),
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)
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}
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func LEUint64(b []byte) uint64 {
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
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uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
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}
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func LEPutUint64(b []byte, v uint64) {
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_ = b[7] // early bounds check to guarantee safety of writes below
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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b[4] = byte(v >> 32)
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b[5] = byte(v >> 40)
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b[6] = byte(v >> 48)
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b[7] = byte(v >> 56)
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}
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func LEAppendUint64(b []byte, v uint64) []byte {
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return append(b,
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byte(v),
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byte(v>>8),
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byte(v>>16),
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byte(v>>24),
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byte(v>>32),
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byte(v>>40),
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byte(v>>48),
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byte(v>>56),
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)
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}
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func BEUint16(b []byte) uint16 {
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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint16(b[1]) | uint16(b[0])<<8
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}
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func BEPutUint16(b []byte, v uint16) {
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_ = b[1] // early bounds check to guarantee safety of writes below
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b[0] = byte(v >> 8)
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b[1] = byte(v)
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}
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func BEAppendUint16(b []byte, v uint16) []byte {
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return append(b,
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byte(v>>8),
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byte(v),
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)
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}
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func BEUint32(b []byte) uint32 {
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
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}
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func BEPutUint32(b []byte, v uint32) {
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_ = b[3] // early bounds check to guarantee safety of writes below
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b[0] = byte(v >> 24)
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b[1] = byte(v >> 16)
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b[2] = byte(v >> 8)
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b[3] = byte(v)
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}
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func BEAppendUint32(b []byte, v uint32) []byte {
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return append(b,
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byte(v>>24),
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byte(v>>16),
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byte(v>>8),
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byte(v),
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)
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}
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func BEUint64(b []byte) uint64 {
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
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uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
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}
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func BEPutUint64(b []byte, v uint64) {
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_ = b[7] // early bounds check to guarantee safety of writes below
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b[0] = byte(v >> 56)
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b[1] = byte(v >> 48)
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b[2] = byte(v >> 40)
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b[3] = byte(v >> 32)
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b[4] = byte(v >> 24)
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b[5] = byte(v >> 16)
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b[6] = byte(v >> 8)
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b[7] = byte(v)
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}
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func BEAppendUint64(b []byte, v uint64) []byte {
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return append(b,
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byte(v>>56),
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byte(v>>48),
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byte(v>>40),
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byte(v>>32),
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byte(v>>24),
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byte(v>>16),
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byte(v>>8),
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byte(v),
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)
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} |