86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
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package bitutil
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// PackInt8s will pack two signed 8bit integers into an unsigned 16bit integer.
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func PackInt8s(i1, i2 int8) uint16 {
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const bits = 8
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const mask = (1 << bits) - 1
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return uint16(i1)<<bits | uint16(i2)&mask
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}
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// UnpackInt8s will unpack two signed 8bit integers from an unsigned 16bit integer.
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func UnpackInt8s(i uint16) (int8, int8) {
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const bits = 8
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const mask = (1 << bits) - 1
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return int8(i >> bits), int8(i & mask)
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}
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// PackInt16s will pack two signed 16bit integers into an unsigned 32bit integer.
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func PackInt16s(i1, i2 int16) uint32 {
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const bits = 16
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const mask = (1 << bits) - 1
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return uint32(i1)<<bits | uint32(i2)&mask
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}
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// UnpackInt16s will unpack two signed 16bit integers from an unsigned 32bit integer.
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func UnpackInt16s(i uint32) (int16, int16) {
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const bits = 16
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const mask = (1 << bits) - 1
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return int16(i >> bits), int16(i & mask)
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}
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// PackInt32s will pack two signed 32bit integers into an unsigned 64bit integer.
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func PackInt32s(i1, i2 int32) uint64 {
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const bits = 32
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const mask = (1 << bits) - 1
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return uint64(i1)<<bits | uint64(i2)&mask
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}
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// UnpackInt32s will unpack two signed 32bit integers from an unsigned 64bit integer.
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func UnpackInt32s(i uint64) (int32, int32) {
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const bits = 32
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const mask = (1 << bits) - 1
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return int32(i >> bits), int32(i & mask)
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}
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// PackUint8s will pack two unsigned 8bit integers into an unsigned 16bit integer.
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func PackUint8s(u1, u2 uint8) uint16 {
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const bits = 8
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const mask = (1 << bits) - 1
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return uint16(u1)<<bits | uint16(u2)&mask
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}
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// UnpackUint8s will unpack two unsigned 8bit integers from an unsigned 16bit integer.
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func UnpackUint8s(u uint16) (uint8, uint8) {
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const bits = 8
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const mask = (1 << bits) - 1
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return uint8(u >> bits), uint8(u & mask)
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}
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// PackUint16s will pack two unsigned 16bit integers into an unsigned 32bit integer.
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func PackUint16s(u1, u2 uint16) uint32 {
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const bits = 16
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const mask = (1 << bits) - 1
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return uint32(u1)<<bits | uint32(u2)&mask
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}
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// UnpackUint16s will unpack two unsigned 16bit integers from an unsigned 32bit integer.
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func UnpackUint16s(u uint32) (uint16, uint16) {
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const bits = 16
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const mask = (1 << bits) - 1
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return uint16(u >> bits), uint16(u & mask)
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}
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// PackUint32s will pack two unsigned 32bit integers into an unsigned 64bit integer.
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func PackUint32s(u1, u2 uint32) uint64 {
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const bits = 32
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const mask = (1 << bits) - 1
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return uint64(u1)<<bits | uint64(u2)&mask
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}
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// UnpackUint32s will unpack two unsigned 32bit integers from an unsigned 64bit integer.
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func UnpackUint32s(u uint64) (uint32, uint32) {
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const bits = 32
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const mask = (1 << bits) - 1
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return uint32(u >> bits), uint32(u & mask)
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}
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