139 lines
2.4 KiB
Go
139 lines
2.4 KiB
Go
package fr32
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import (
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"math/bits"
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"runtime"
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"sync"
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"github.com/filecoin-project/specs-actors/actors/abi"
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)
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var mtTresh = 32 << 20
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func mt(in, out []byte, padLen int, op func(in, out []byte)) {
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threads := padLen / mtTresh
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if threads > runtime.NumCPU() {
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threads = 1 << (32 - bits.LeadingZeros32(uint32(runtime.NumCPU())))
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}
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threadBytes := abi.PaddedPieceSize(padLen / threads)
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var wg sync.WaitGroup
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wg.Add(threads)
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for i := 0; i < threads; i++ {
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go func(thread int) {
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defer wg.Done()
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start := threadBytes * abi.PaddedPieceSize(thread)
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end := start + threadBytes
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op(in[start.Unpadded():end.Unpadded()], out[start:end])
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}(i)
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}
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wg.Wait()
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}
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// Assumes len(in)%127==0 and len(out)%128==0
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func Pad(in, out []byte) {
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if len(out) > mtTresh {
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mt(in, out, len(out), Pad)
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return
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}
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chunks := len(out) / 128
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for chunk := 0; chunk < chunks; chunk++ {
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inOff := chunk * 127
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outOff := chunk * 128
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copy(out[outOff:outOff+31], in[inOff:inOff+31])
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t := in[inOff+31] >> 6
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out[outOff+31] = in[inOff+31] & 0x3f
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var v byte
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for i := 32; i < 64; i++ {
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v = in[inOff+i]
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out[outOff+i] = (v << 2) | t
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t = v >> 6
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}
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t = v >> 4
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out[outOff+63] &= 0x3f
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for i := 64; i < 96; i++ {
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v = in[inOff+i]
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out[outOff+i] = (v << 4) | t
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t = v >> 4
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}
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t = v >> 2
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out[outOff+95] &= 0x3f
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for i := 96; i < 127; i++ {
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v = in[inOff+i]
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out[outOff+i] = (v << 6) | t
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t = v >> 2
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}
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out[outOff+127] = t & 0x3f
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}
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}
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// Assumes len(in)%128==0 and len(out)%127==0
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func Unpad(in []byte, out []byte) {
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if len(out) > mtTresh {
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mt(in, out, len(in), Unpad)
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return
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}
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chunks := len(in) / 128
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for chunk := 0; chunk < chunks; chunk++ {
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inOffNext := chunk*128 + 1
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outOff := chunk * 127
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at := in[chunk*128]
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for i := 0; i < 32; i++ {
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next := in[i+inOffNext]
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out[outOff+i] = at
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//out[i] |= next << 8
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at = next
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}
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out[outOff+31] |= at << 6
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for i := 32; i < 64; i++ {
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next := in[i+inOffNext]
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out[outOff+i] = at >> 2
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out[outOff+i] |= next << 6
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at = next
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}
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out[outOff+63] ^= (at << 6) ^ (at << 4)
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for i := 64; i < 96; i++ {
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next := in[i+inOffNext]
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out[outOff+i] = at >> 4
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out[outOff+i] |= next << 4
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at = next
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}
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out[outOff+95] ^= (at << 4) ^ (at << 2)
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for i := 96; i < 127; i++ {
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next := in[i+inOffNext]
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out[outOff+i] = at >> 6
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out[outOff+i] |= next << 2
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at = next
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}
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}
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}
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