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utils.go
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/
utils.go
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package mars
import (
"encoding/binary"
)
// u4byte = uint32
// u1byte = byte
func rotr(x, n uint32) uint32 {
return (x >> n) | (x << (32 - n))
}
func rotl(x, n uint32) uint32 {
return (x << n) | (x >> (32 - n))
}
func bswap(x uint32) uint32 {
return (rotl(x, 8) & 0x00ff00ff | rotr(x, 8) & 0xff00ff00)
}
func io_swap(x uint32) uint32 {
return bswap(x)
}
func bytesToUint32s(inp []byte) [4]uint32 {
var blk [4]uint32
blk[0] = binary.BigEndian.Uint32(inp[0:])
blk[1] = binary.BigEndian.Uint32(inp[4:])
blk[2] = binary.BigEndian.Uint32(inp[8:])
blk[3] = binary.BigEndian.Uint32(inp[12:])
return blk
}
func Uint32sToBytes(blk [4]uint32) [16]byte {
var sav [16]byte
binary.BigEndian.PutUint32(sav[0:], blk[0])
binary.BigEndian.PutUint32(sav[4:], blk[1])
binary.BigEndian.PutUint32(sav[8:], blk[2])
binary.BigEndian.PutUint32(sav[12:], blk[3])
return sav
}