mirror of
https://github.com/fumiama/unibase2n.git
synced 2026-06-05 00:32:47 +08:00
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
//go:build !amd64
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// +build !amd64
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package unibase2n
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import "encoding/binary"
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// enc16blk1 for bit 1 (actual enc128blk1)
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// len(in)!=0, len(out)==len(in)*16
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//go:nosplit
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func enc16blk1(mask uint16, in, out []byte) {
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for i, n := range in {
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c := i * 16
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binary.BigEndian.PutUint16(out[c:c+2], uint16(n>>7)+mask)
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binary.BigEndian.PutUint16(out[c+2:c+4], uint16(n>>6&1)+mask)
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binary.BigEndian.PutUint16(out[c+4:c+6], uint16(n>>5&1)+mask)
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binary.BigEndian.PutUint16(out[c+6:c+8], uint16(n>>4&1)+mask)
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binary.BigEndian.PutUint16(out[c+8:c+10], uint16(n>>3&1)+mask)
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binary.BigEndian.PutUint16(out[c+10:c+12], uint16(n>>2&1)+mask)
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binary.BigEndian.PutUint16(out[c+12:c+14], uint16(n>>1&1)+mask)
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binary.BigEndian.PutUint16(out[c+14:c+16], uint16(n&1)+mask)
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}
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}
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// enc64blk2 for bit 2
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// len(in)!=0, len(out)==len(in)*8
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//go:nosplit
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func enc64blk2(mask uint64, in, out []byte) {
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for i, n := range in {
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c := i * 8
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x := (uint64(n)<<42 | uint64(n)<<28 | uint64(n)<<14 | uint64(n)) & 0x00030003_00030003
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binary.BigEndian.PutUint64(out[c:c+8], x+mask)
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}
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}
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// enc32blk4 for bit 4
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// len(in)!=0, len(out)==len(in)*4
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//go:nosplit
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func enc32blk4(mask uint32, in, out []byte) {
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for i, n := range in {
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c := i * 4
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x := (uint32(n)<<12 | uint32(n)) & 0x000f000f
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binary.BigEndian.PutUint32(out[c:c+4], x+mask)
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}
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}
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// enc16blk8 for bit 8
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// len(in)!=0, len(out)==len(in)*2
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//go:nosplit
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func enc16blk8(mask uint16, in, out []byte) {
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for i, n := range in {
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c := i * 2
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binary.BigEndian.PutUint16(out[c:c+2], uint16(n)+mask)
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}
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}
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