151 lines
4.3 KiB
Go
151 lines
4.3 KiB
Go
package nlenc
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import (
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"fmt"
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"unsafe"
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)
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// PutUint8 encodes a uint8 into b.
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// If b is not exactly 1 byte in length, PutUint8 will panic.
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func PutUint8(b []byte, v uint8) {
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if l := len(b); l != 1 {
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panic(fmt.Sprintf("PutUint8: unexpected byte slice length: %d", l))
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}
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b[0] = v
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}
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// PutUint16 encodes a uint16 into b using the host machine's native endianness.
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// If b is not exactly 2 bytes in length, PutUint16 will panic.
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func PutUint16(b []byte, v uint16) {
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if l := len(b); l != 2 {
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panic(fmt.Sprintf("PutUint16: unexpected byte slice length: %d", l))
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}
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*(*uint16)(unsafe.Pointer(&b[0])) = v
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}
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// PutUint32 encodes a uint32 into b using the host machine's native endianness.
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// If b is not exactly 4 bytes in length, PutUint32 will panic.
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func PutUint32(b []byte, v uint32) {
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if l := len(b); l != 4 {
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panic(fmt.Sprintf("PutUint32: unexpected byte slice length: %d", l))
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}
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*(*uint32)(unsafe.Pointer(&b[0])) = v
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}
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// PutUint64 encodes a uint64 into b using the host machine's native endianness.
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// If b is not exactly 8 bytes in length, PutUint64 will panic.
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func PutUint64(b []byte, v uint64) {
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if l := len(b); l != 8 {
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panic(fmt.Sprintf("PutUint64: unexpected byte slice length: %d", l))
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}
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*(*uint64)(unsafe.Pointer(&b[0])) = v
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}
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// PutInt32 encodes a int32 into b using the host machine's native endianness.
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// If b is not exactly 4 bytes in length, PutInt32 will panic.
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func PutInt32(b []byte, v int32) {
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if l := len(b); l != 4 {
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panic(fmt.Sprintf("PutInt32: unexpected byte slice length: %d", l))
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}
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*(*int32)(unsafe.Pointer(&b[0])) = v
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}
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// Uint8 decodes a uint8 from b.
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// If b is not exactly 1 byte in length, Uint8 will panic.
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func Uint8(b []byte) uint8 {
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if l := len(b); l != 1 {
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panic(fmt.Sprintf("Uint8: unexpected byte slice length: %d", l))
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}
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return b[0]
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}
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// Uint16 decodes a uint16 from b using the host machine's native endianness.
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// If b is not exactly 2 bytes in length, Uint16 will panic.
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func Uint16(b []byte) uint16 {
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if l := len(b); l != 2 {
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panic(fmt.Sprintf("Uint16: unexpected byte slice length: %d", l))
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}
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return *(*uint16)(unsafe.Pointer(&b[0]))
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}
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// Uint32 decodes a uint32 from b using the host machine's native endianness.
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// If b is not exactly 4 bytes in length, Uint32 will panic.
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func Uint32(b []byte) uint32 {
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if l := len(b); l != 4 {
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panic(fmt.Sprintf("Uint32: unexpected byte slice length: %d", l))
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}
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return *(*uint32)(unsafe.Pointer(&b[0]))
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}
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// Uint64 decodes a uint64 from b using the host machine's native endianness.
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// If b is not exactly 8 bytes in length, Uint64 will panic.
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func Uint64(b []byte) uint64 {
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if l := len(b); l != 8 {
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panic(fmt.Sprintf("Uint64: unexpected byte slice length: %d", l))
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}
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return *(*uint64)(unsafe.Pointer(&b[0]))
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}
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// Int32 decodes an int32 from b using the host machine's native endianness.
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// If b is not exactly 4 bytes in length, Int32 will panic.
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func Int32(b []byte) int32 {
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if l := len(b); l != 4 {
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panic(fmt.Sprintf("Int32: unexpected byte slice length: %d", l))
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}
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return *(*int32)(unsafe.Pointer(&b[0]))
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}
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// Uint8Bytes encodes a uint8 into a newly-allocated byte slice. It is a
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// shortcut for allocating a new byte slice and filling it using PutUint8.
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func Uint8Bytes(v uint8) []byte {
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b := make([]byte, 1)
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PutUint8(b, v)
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return b
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}
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// Uint16Bytes encodes a uint16 into a newly-allocated byte slice using the
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// host machine's native endianness. It is a shortcut for allocating a new
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// byte slice and filling it using PutUint16.
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func Uint16Bytes(v uint16) []byte {
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b := make([]byte, 2)
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PutUint16(b, v)
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return b
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}
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// Uint32Bytes encodes a uint32 into a newly-allocated byte slice using the
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// host machine's native endianness. It is a shortcut for allocating a new
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// byte slice and filling it using PutUint32.
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func Uint32Bytes(v uint32) []byte {
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b := make([]byte, 4)
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PutUint32(b, v)
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return b
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}
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// Uint64Bytes encodes a uint64 into a newly-allocated byte slice using the
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// host machine's native endianness. It is a shortcut for allocating a new
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// byte slice and filling it using PutUint64.
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func Uint64Bytes(v uint64) []byte {
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b := make([]byte, 8)
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PutUint64(b, v)
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return b
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}
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// Int32Bytes encodes a int32 into a newly-allocated byte slice using the
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// host machine's native endianness. It is a shortcut for allocating a new
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// byte slice and filling it using PutInt32.
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func Int32Bytes(v int32) []byte {
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b := make([]byte, 4)
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PutInt32(b, v)
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return b
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}
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