fr32: io.Reader utils
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parent
d38296a553
commit
55867ab48b
33
fr32/fr32.go
33
fr32/fr32.go
@ -8,19 +8,30 @@ import (
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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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var mtTresh = uint64(32 << 20)
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func mt(in, out []byte, padLen int, op func(unpadded, padded []byte)) {
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threads := padLen / mtTresh
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if threads > runtime.NumCPU() {
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func mtChunkCount(usz abi.PaddedPieceSize) uint64 {
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threads := (uint64(usz)) / mtTresh
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if threads > uint64(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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if threads == 0 {
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return 1
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}
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if threads > 64 {
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return 64 // avoid too large buffers
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}
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return threads
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}
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func mt(in, out []byte, padLen int, op func(unpadded, padded []byte)) {
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threads := mtChunkCount(abi.PaddedPieceSize(padLen))
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threadBytes := abi.PaddedPieceSize(padLen / int(threads))
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var wg sync.WaitGroup
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wg.Add(threads)
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wg.Add(int(threads))
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for i := 0; i < threads; i++ {
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for i := 0; i < int(threads); i++ {
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go func(thread int) {
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defer wg.Done()
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@ -35,7 +46,7 @@ func mt(in, out []byte, padLen int, op func(unpadded, padded []byte)) {
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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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if len(out) > int(mtTresh) {
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mt(in, out, len(out), pad)
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return
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}
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@ -44,7 +55,7 @@ func Pad(in, out []byte) {
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}
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func pad(in, out []byte) {
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if len(out) > mtTresh {
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if len(out) > int(mtTresh) {
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mt(in, out, len(out), Pad)
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return
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}
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@ -88,11 +99,9 @@ func pad(in, out []byte) {
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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(in) > mtTresh {
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if len(in) > int(mtTresh) {
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mt(out, in, len(in), unpad)
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return
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}
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@ -63,4 +63,3 @@ func TestWriteTwoPcs(t *testing.T) {
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Unpad(ffiBytes, unpadBytes)
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require.Equal(t, rawBytes, unpadBytes)
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}
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114
fr32/readers.go
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114
fr32/readers.go
Normal file
@ -0,0 +1,114 @@
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package fr32
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import (
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"io"
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"math/bits"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/specs-actors/actors/abi"
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)
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type padReader struct {
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src io.Reader
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left uint64
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work []byte
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}
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func NewPadReader(src io.Reader, sz abi.UnpaddedPieceSize) (io.Reader, error) {
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if err := sz.Validate(); err != nil {
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return nil, xerrors.Errorf("bad piece size: %w", err)
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}
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buf := make([]byte, mtTresh*mtChunkCount(sz.Padded()))
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return &padReader{
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src: src,
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left: uint64(sz.Padded()),
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work: buf,
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}, nil
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}
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func (r *padReader) Read(out []byte) (int, error) {
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if r.left == 0 {
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return 0, io.EOF
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}
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outTwoPow := 1 << (63 - bits.LeadingZeros64(uint64(len(out))))
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if err := abi.PaddedPieceSize(outTwoPow).Validate(); err != nil {
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return 0, xerrors.Errorf("output must be of valid padded piece size: %w", err)
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}
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todo := abi.PaddedPieceSize(outTwoPow).Unpadded()
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if r.left < uint64(todo.Padded()) {
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todo = abi.PaddedPieceSize(1 << (63 - bits.LeadingZeros64(r.left))).Unpadded()
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}
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r.left -= uint64(todo.Padded())
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n, err := r.src.Read(r.work[:todo])
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if err != nil && err != io.EOF {
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return n, err
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}
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Pad(r.work[:todo], out[:todo.Padded()])
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return int(todo.Padded()), err
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}
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type unpadReader struct {
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src io.Reader
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left uint64
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work []byte
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}
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func NewUnpadReader(src io.Reader, sz abi.PaddedPieceSize) (io.Reader, error) {
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if err := sz.Validate(); err != nil {
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return nil, xerrors.Errorf("bad piece size: %w", err)
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}
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buf := make([]byte, mtTresh*mtChunkCount(sz))
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return &unpadReader{
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src: src,
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left: uint64(sz),
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work: buf,
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}, nil
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}
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func (r *unpadReader) Read(out []byte) (int, error) {
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if r.left == 0 {
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return 0, io.EOF
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}
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outTwoPow := 1 << (63 - bits.LeadingZeros64(uint64(len(out))))
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if err := abi.PaddedPieceSize(outTwoPow).Validate(); err != nil {
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return 0, xerrors.Errorf("output must be of valid padded piece size: %w", err)
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}
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todo := abi.PaddedPieceSize(outTwoPow)
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if r.left < uint64(todo) {
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todo = abi.PaddedPieceSize(1 << (63 - bits.LeadingZeros64(r.left)))
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}
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r.left -= uint64(todo)
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n, err := r.src.Read(r.work[:todo])
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if err != nil && err != io.EOF {
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return n, err
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}
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if n != int(todo) {
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return 0, xerrors.Errorf("didn't read enough: %w", err)
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}
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Unpad(r.work[:todo], out[:todo.Unpadded()])
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return int(todo.Unpadded()), err
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}
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53
fr32/readers_test.go
Normal file
53
fr32/readers_test.go
Normal file
@ -0,0 +1,53 @@
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package fr32
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import (
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"bytes"
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"io/ioutil"
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"testing"
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"github.com/stretchr/testify/require"
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"github.com/filecoin-project/specs-actors/actors/abi"
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)
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func TestPadReader(t *testing.T) {
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ps := abi.PaddedPieceSize(64 << 20).Unpadded()
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raw := bytes.Repeat([]byte{0x55}, int(ps))
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r, err := NewPadReader(bytes.NewReader(raw), ps)
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if err != nil {
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t.Fatal(err)
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}
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readerPadded, err := ioutil.ReadAll(r)
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if err != nil {
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t.Fatal(err)
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}
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padOut := make([]byte, ps.Padded())
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Pad(raw, padOut)
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require.Equal(t, padOut, readerPadded)
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}
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func TestUnpadReader(t *testing.T) {
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ps := abi.PaddedPieceSize(64 << 20).Unpadded()
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raw := bytes.Repeat([]byte{0x77}, int(ps))
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padOut := make([]byte, ps.Padded())
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Pad(raw, padOut)
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r, err := NewUnpadReader(bytes.NewReader(padOut), ps.Padded())
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if err != nil {
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t.Fatal(err)
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}
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readered, err := ioutil.ReadAll(r)
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if err != nil {
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t.Fatal(err)
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}
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require.Equal(t, raw, readered)
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}
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