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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package binary implements simple translation between numbers and byte
// sequences and encoding and decoding of varints.
//
// Numbers are translated by reading and writing fixed-size values.
// A fixed-size value is either a fixed-size arithmetic
// type (bool, int8, uint8, int16, float32, complex64, ...)
// or an array or struct containing only fixed-size values.
//
// Based on the [encoding/binary] package.
//
// [encoding/binary]: https://github.com/golang/go/blob/go1.26.2/src/encoding/binary
package binary
// A ByteOrder specifies how to convert byte slices into
// 16-, 32-, or 64-bit unsigned integers.
//
// It is implemented by [LittleEndian], [BigEndian], and [NativeEndian].
type ByteOrder interface {
Uint16([]byte) uint16
Uint32([]byte) uint32
Uint64([]byte) uint64
PutUint16([]byte, uint16)
PutUint32([]byte, uint32)
PutUint64([]byte, uint64)
String() string
}
// AppendByteOrder specifies how to append 16-, 32-, or 64-bit unsigned integers
// into a byte slice.
//
// It is implemented by [LittleEndian], [BigEndian], and [NativeEndian].
type AppendByteOrder interface {
AppendUint16([]byte, uint16) []byte
AppendUint32([]byte, uint32) []byte
AppendUint64([]byte, uint64) []byte
String() string
}
// LittleEndian is the little-endian implementation of [ByteOrder] and [AppendByteOrder].
var LittleEndian LE
// BigEndian is the big-endian implementation of [ByteOrder] and [AppendByteOrder].
var BigEndian BE
type LE struct {
empty byte
}
// Uint16 returns the uint16 representation of b[0:2].
func (LE) Uint16(b []byte) uint16 {
_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
return uint16(b[0]) | uint16(b[1])<<8
}
// PutUint16 stores v into b[0:2].
func (LE) PutUint16(b []byte, v uint16) {
_ = b[1] // early bounds check to guarantee safety of writes below
b[0] = byte(v)
b[1] = byte(v >> 8)
}
// AppendUint16 appends the bytes of v to b and returns the appended slice.
// Requires at least 2 bytes of spare capacity in b.
func (LE) AppendUint16(b []byte, v uint16) []byte {
return append(b,
byte(v),
byte(v>>8),
)
}
// Uint32 returns the uint32 representation of b[0:4].
func (LE) Uint32(b []byte) uint32 {
_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
}
// PutUint32 stores v into b[0:4].
func (LE) PutUint32(b []byte, v uint32) {
_ = b[3] // early bounds check to guarantee safety of writes below
b[0] = byte(v)
b[1] = byte(v >> 8)
b[2] = byte(v >> 16)
b[3] = byte(v >> 24)
}
// AppendUint32 appends the bytes of v to b and returns the appended slice.
// Requires at least 4 bytes of spare capacity in b.
func (LE) AppendUint32(b []byte, v uint32) []byte {
return append(b,
byte(v),
byte(v>>8),
byte(v>>16),
byte(v>>24),
)
}
// Uint64 returns the uint64 representation of b[0:8].
func (LE) Uint64(b []byte) uint64 {
_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
}
// PutUint64 stores v into b[0:8].
func (LE) PutUint64(b []byte, v uint64) {
_ = b[7] // early bounds check to guarantee safety of writes below
b[0] = byte(v)
b[1] = byte(v >> 8)
b[2] = byte(v >> 16)
b[3] = byte(v >> 24)
b[4] = byte(v >> 32)
b[5] = byte(v >> 40)
b[6] = byte(v >> 48)
b[7] = byte(v >> 56)
}
// AppendUint64 appends the bytes of v to b and returns the appended slice.
// Requires at least 8 bytes of spare capacity in b.
func (LE) AppendUint64(b []byte, v uint64) []byte {
return append(b,
byte(v),
byte(v>>8),
byte(v>>16),
byte(v>>24),
byte(v>>32),
byte(v>>40),
byte(v>>48),
byte(v>>56),
)
}
func (LE) String() string { return "LittleEndian" }
type BE struct {
empty byte
}
// Uint16 returns the uint16 representation of b[0:2].
func (BE) Uint16(b []byte) uint16 {
_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
return uint16(b[1]) | uint16(b[0])<<8
}
// PutUint16 stores v into b[0:2].
func (BE) PutUint16(b []byte, v uint16) {
_ = b[1] // early bounds check to guarantee safety of writes below
b[0] = byte(v >> 8)
b[1] = byte(v)
}
// AppendUint16 appends the bytes of v to b and returns the appended slice.
// Requires at least 2 bytes of spare capacity in b.
func (BE) AppendUint16(b []byte, v uint16) []byte {
return append(b,
byte(v>>8),
byte(v),
)
}
// Uint32 returns the uint32 representation of b[0:4].
func (BE) Uint32(b []byte) uint32 {
_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
}
// PutUint32 stores v into b[0:4].
func (BE) PutUint32(b []byte, v uint32) {
_ = b[3] // early bounds check to guarantee safety of writes below
b[0] = byte(v >> 24)
b[1] = byte(v >> 16)
b[2] = byte(v >> 8)
b[3] = byte(v)
}
// AppendUint32 appends the bytes of v to b and returns the appended slice.
// Requires at least 4 bytes of spare capacity in b.
func (BE) AppendUint32(b []byte, v uint32) []byte {
return append(b,
byte(v>>24),
byte(v>>16),
byte(v>>8),
byte(v),
)
}
// Uint64 returns the uint64 representation of b[0:8].
func (BE) Uint64(b []byte) uint64 {
_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
}
// PutUint64 stores v into b[0:8].
func (BE) PutUint64(b []byte, v uint64) {
_ = b[7] // early bounds check to guarantee safety of writes below
b[0] = byte(v >> 56)
b[1] = byte(v >> 48)
b[2] = byte(v >> 40)
b[3] = byte(v >> 32)
b[4] = byte(v >> 24)
b[5] = byte(v >> 16)
b[6] = byte(v >> 8)
b[7] = byte(v)
}
// AppendUint64 appends the bytes of v to b and returns the appended slice.
// Requires at least 8 bytes of spare capacity in b.
func (BE) AppendUint64(b []byte, v uint64) []byte {
return append(b,
byte(v>>56),
byte(v>>48),
byte(v>>40),
byte(v>>32),
byte(v>>24),
byte(v>>16),
byte(v>>8),
byte(v),
)
}
func (BE) String() string { return "BigEndian" }