lib: Add file name compression
Allows to compress short arbitrary strings and returns a string using base64 url encoding. Generator for tables included and a few samples has been added. Add more to init.go Tested with fuzzing for crash resistance and symmetry, see fuzz.go
This commit is contained in:
Klaus Post
GitHub
parent
770a6f2cad
commit
cb7534dcdf
8 changed files with 363 additions and 4 deletions
1
.gitignore
vendored
1
.gitignore
vendored
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@ -9,3 +9,4 @@ rclone.iml
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*.test
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*.log
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*.iml
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fuzz-build.zip
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1
go.mod
1
go.mod
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@ -25,6 +25,7 @@ require (
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github.com/jlaffaye/ftp v0.0.0-20200720194710-13949d38913e
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github.com/jzelinskie/whirlpool v0.0.0-20170603002051-c19460b8caa6
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github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 // indirect
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github.com/klauspost/compress v1.10.11
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github.com/koofr/go-httpclient v0.0.0-20200420163713-93aa7c75b348
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github.com/koofr/go-koofrclient v0.0.0-20190724113126-8e5366da203a
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github.com/mattn/go-colorable v0.1.7
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6
go.sum
6
go.sum
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@ -87,10 +87,6 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
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github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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github.com/billziss-gh/cgofuse v1.3.0 h1:mFj8XQg/vvxMFywNy1F7IqFYcMeBqceYTh1+iUhpsk8=
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github.com/billziss-gh/cgofuse v1.3.0/go.mod h1:LJjoaUojlVjgo5GQoEJTcJNqZJeRU0nCR84CyxKt2YM=
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github.com/billziss-gh/cgofuse v1.3.1-0.20200703171401-45df47debffe h1:AXqxouOOD7FQuoVfZubWmMyHzOrrSGZbdh9o6PCtfKM=
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github.com/billziss-gh/cgofuse v1.3.1-0.20200703171401-45df47debffe/go.mod h1:LJjoaUojlVjgo5GQoEJTcJNqZJeRU0nCR84CyxKt2YM=
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github.com/billziss-gh/cgofuse v1.4.0 h1:kju2jDmdNuDDCrxPob2ggmZr5Mj/odCjU1Y8kx0Th9E=
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github.com/billziss-gh/cgofuse v1.4.0/go.mod h1:LJjoaUojlVjgo5GQoEJTcJNqZJeRU0nCR84CyxKt2YM=
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github.com/bradfitz/iter v0.0.0-20140124041915-454541ec3da2/go.mod h1:PyRFw1Lt2wKX4ZVSQ2mk+PeDa1rxyObEDlApuIsUKuo=
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@ -265,6 +261,8 @@ github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvW
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github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
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github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
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github.com/klauspost/compress v1.10.11 h1:K9z59aO18Aywg2b/WSgBaUX99mHy2BES18Cr5lBKZHk=
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github.com/klauspost/compress v1.10.11/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
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github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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84
lib/encoder/filename/decode.go
Normal file
84
lib/encoder/filename/decode.go
Normal file
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@ -0,0 +1,84 @@
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package filename
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import (
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"bytes"
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"encoding/base64"
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"encoding/binary"
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"errors"
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"sync"
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"github.com/klauspost/compress/huff0"
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)
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// ErrCorrupted is returned if a provided encoded filename cannot be decoded.
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var ErrCorrupted = errors.New("file name corrupt")
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// ErrUnsupported is returned if a provided encoding may come from a future version or the file name is corrupt.
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var ErrUnsupported = errors.New("file name possibly generated by future version of rclone")
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// Custom decoder for tableCustom types. Stateful, so must have lock.
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var customDec huff0.Scratch
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var customDecMu sync.Mutex
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// Decode an encoded string.
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func Decode(s string) (string, error) {
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if len(s) < 1 {
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return "", ErrCorrupted
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}
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table := decodeMap[s[0]]
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if table == 0 {
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return "", ErrCorrupted
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}
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table--
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s = s[1:]
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data := make([]byte, base64.URLEncoding.DecodedLen(len(s)))
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n, err := base64.URLEncoding.Decode(data, ([]byte)(s))
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if err != nil || n < 0 {
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return "", ErrCorrupted
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}
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data = data[:n]
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switch table {
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case tableUncompressed:
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return string(data), nil
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case tableReserved:
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return "", ErrUnsupported
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case tableRLE:
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if len(data) < 2 {
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return "", ErrCorrupted
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}
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n, used := binary.Uvarint(data[:len(data)-1])
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if used <= 0 || n > maxLength {
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return "", ErrCorrupted
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}
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return string(bytes.Repeat(data[len(data)-1:], int(n))), nil
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case tableCustom:
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customDecMu.Lock()
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defer customDecMu.Unlock()
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_, data, err := huff0.ReadTable(data, &customDec)
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if err != nil {
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return "", ErrCorrupted
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}
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customDec.MaxDecodedSize = maxLength
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decoded, err := customDec.Decompress1X(data)
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if err != nil {
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return "", ErrCorrupted
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}
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return string(decoded), nil
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default:
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if table >= byte(len(decTables)) {
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return "", ErrCorrupted
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}
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dec := decTables[table]
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if dec == nil {
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return "", ErrUnsupported
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}
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var dst [maxLength]byte
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name, err := dec.Decompress1X(dst[:0], data)
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if err != nil {
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return "", ErrCorrupted
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}
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return string(name), nil
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}
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}
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60
lib/encoder/filename/encode.go
Normal file
60
lib/encoder/filename/encode.go
Normal file
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@ -0,0 +1,60 @@
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package filename
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import (
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"encoding/base64"
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"encoding/binary"
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"github.com/klauspost/compress/huff0"
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)
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// Encode will encode the string and return a base64 (url) compatible version of it.
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// Calling Decode with the returned string should always succeed.
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// It is not a requirement that the input string is valid utf-8.
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func Encode(s string) string {
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initCoders()
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bestSize := len(s)
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bestTable := tableUncompressed
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org := []byte(s)
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bestOut := []byte(s)
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// Try all tables and choose the best
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for i, enc := range encTables[:] {
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if len(org) <= 1 || len(org) > maxLength {
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// Use the uncompressed
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break
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}
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if enc == nil {
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continue
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}
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// Try to encode using table.
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err := func() error {
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encTableLocks[i].Lock()
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defer encTableLocks[i].Unlock()
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out, _, err := huff0.Compress1X(org, enc)
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if err != nil {
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return err
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}
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if len(out) < bestSize {
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bestOut = bestOut[:len(out)]
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bestTable = i
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bestSize = len(out)
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copy(bestOut, out)
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}
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return nil
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}()
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// If input is a single byte repeated store as RLE or save uncompressed.
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if err == huff0.ErrUseRLE {
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if len(org) > 2 {
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// Encode as one byte repeated since it will be smaller than uncompressed.
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n := binary.PutUvarint(bestOut, uint64(len(org)))
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bestOut = bestOut[:n+1]
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bestOut[n] = org[0]
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bestSize = n + 1
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bestTable = tableRLE
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}
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break
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}
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}
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return string(encodeURL[bestTable]) + base64.URLEncoding.EncodeToString(bestOut)
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}
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33
lib/encoder/filename/fuzz.go
Normal file
33
lib/encoder/filename/fuzz.go
Normal file
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@ -0,0 +1,33 @@
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//+build gofuzz
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package filename
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import (
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"bytes"
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"fmt"
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)
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// Run like:
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// go-fuzz-build -o=fuzz-build.zip -func=Fuzz . && go-fuzz -minimize=5s -bin=fuzz-build.zip -workdir=testdata/corpus -procs=24
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// Fuzz test the provided input.
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func Fuzz(data []byte) int {
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// First try to decode as is.
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// We don't care about the result, it just shouldn't crash.
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Decode(string(data))
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// Now encode
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enc := Encode(string(data))
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// And decoded must match
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decoded, err := Decode(enc)
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if err != nil {
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panic(fmt.Sprintf("error decoding %q, input %q: %v", enc, string(data), err))
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}
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if !bytes.Equal(data, []byte(decoded)) {
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panic(fmt.Sprintf("decode mismatch, encoded: %q, org: %q, got: %q", enc, string(data), decoded))
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}
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// Everything is good.
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return 1
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}
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93
lib/encoder/filename/gentable.go
Normal file
93
lib/encoder/filename/gentable.go
Normal file
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@ -0,0 +1,93 @@
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//+build ignore
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package main
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import (
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"encoding/base64"
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"fmt"
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"math"
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"github.com/klauspost/compress"
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"github.com/klauspost/compress/huff0"
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)
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// Replace/add histogram data and execute go run gentable.go
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func main() {
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// Allow non-represented characters.
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const omitUnused = false
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histogram := [256]uint64{
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// ncw home directory
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//0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 19442, 760, 0, 349, 570, 1520, 199, 76, 685, 654, 0, 40377, 1605, 395132, 935270, 0, 1156377, 887730, 811737, 712241, 693240, 689139, 675964, 656417, 666577, 657413, 532, 24, 0, 145, 0, 3, 946, 44932, 37362, 46126, 36752, 76346, 19338, 47457, 14288, 38163, 4350, 7867, 36541, 65011, 30255, 26792, 22097, 1803, 39191, 61965, 76585, 11887, 12896, 5931, 1935, 1731, 1385, 1279, 9, 1278, 1, 420185, 0, 1146359, 746359, 968896, 868703, 1393640, 745019, 354147, 159462, 483979, 169092, 75937, 385858, 322166, 466635, 571268, 447132, 13792, 446484, 736844, 732675, 170232, 112983, 63184, 142357, 173945, 21521, 250, 0, 250, 4140, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 39, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 4, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 15, 0, 0, 0, 10, 0, 5, 0, 0, 0, 0, 0, 0, 283, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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//Images:
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//0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 765, 0, 0, 0, 0, 0, 8, 7, 3, 3, 0, 29, 53, 247265, 83587, 0, 265952, 233552, 229781, 71156, 78374, 65141, 46152, 43767, 55603, 39411, 0, 0, 0, 0, 0, 88, 84, 141, 70, 222, 191, 51, 52, 101, 60, 53, 23, 17, 49, 93, 53, 17, 92, 0, 158, 109, 41, 19, 43, 28, 10, 5, 1, 0, 0, 0, 0, 879, 0, 3415, 6770, 39823, 3566, 2491, 964, 42115, 825, 5178, 40755, 483, 1290, 3294, 1720, 6309, 42983, 10, 37739, 3454, 7028, 5077, 854, 227, 1259, 767, 218, 0, 0, 0, 163, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Google Drive:
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 459, 0, 0, 7, 0, 0, 0, 7, 1, 1, 0, 2, 1, 506, 706, 0, 3903, 3552, 3694, 3338, 3262, 3257, 3222, 3249, 3325, 3261, 5, 0, 0, 1, 0, 0, 0, 48, 31, 61, 53, 46, 17, 17, 34, 32, 9, 22, 17, 31, 27, 19, 52, 5, 46, 84, 38, 14, 5, 19, 2, 2, 0, 8, 0, 8, 0, 180, 0, 5847, 3282, 3729, 3695, 3842, 3356, 316, 139, 487, 117, 95, 476, 289, 428, 609, 467, 5, 446, 592, 955, 130, 112, 57, 390, 168, 14, 0, 2, 0, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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}
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// Override with equally distributed characters
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if false {
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histogram = [256]uint64{}
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var chars string
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// base c64
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chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
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// hex
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//chars = "0123456789abcdef"
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for _, v := range []byte(chars) {
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histogram[v] = 1
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}
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}
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// Sum up distributions
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var total uint64
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for _, v := range histogram[:] {
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total += v
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}
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// Scale the distribution to approx this size.
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const scale = 100 << 10
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var tmp []byte
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for i, v := range histogram[:] {
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if v == 0 && omitUnused {
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continue
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}
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nf := float64(v) / float64(total) * scale
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if nf < 1 {
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nf = 1
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}
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t2 := make([]byte, int(math.Ceil(nf)))
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for j := range t2 {
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t2[j] = byte(i)
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}
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tmp = append(tmp, t2...)
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}
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var s huff0.Scratch
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s.Reuse = huff0.ReusePolicyNone
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_, _, err := huff0.Compress1X(tmp, &s)
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if err != nil {
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panic(err)
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}
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fmt.Println("table:", base64.URLEncoding.EncodeToString(s.OutTable))
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// Encode without ones:
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s.Reuse = huff0.ReusePolicyPrefer
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tmp = tmp[:0]
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for i, v := range histogram[:] {
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nf := float64(v) / float64(total) * scale
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t2 := make([]byte, int(math.Ceil(nf)))
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for j := range t2 {
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t2[j] = byte(i)
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}
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tmp = append(tmp, t2...)
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}
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_, _, err = huff0.Compress1X(tmp, &s)
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fmt.Println("sample", len(tmp), "byte, compressed size:", len(s.OutData))
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fmt.Println("Shannon limit:", compress.ShannonEntropyBits(tmp)/8, "bytes")
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if err != nil {
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panic(err)
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}
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fmt.Printf("avg size: 1 -> %.02f", float64(len(s.OutData))/float64(len(tmp)))
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}
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89
lib/encoder/filename/init.go
Normal file
89
lib/encoder/filename/init.go
Normal file
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package filename
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import (
|
||||
"encoding/base64"
|
||||
"sync"
|
||||
|
||||
"github.com/klauspost/compress/huff0"
|
||||
)
|
||||
|
||||
// encodeURL is base64 url encoding values.
|
||||
const encodeURL = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
|
||||
|
||||
// decodeMap will return x = decodeMap[encodeURL[byte(x)]] - 1 if x >= 0 and x < 64, otherwise -1 is returned.
|
||||
var decodeMap [256]byte
|
||||
|
||||
// maxLength is the maximum length that will be attempted to be compressed.
|
||||
const maxLength = 256
|
||||
|
||||
var (
|
||||
initOnce sync.Once // Used to control init of tables.
|
||||
|
||||
encTables [64]*huff0.Scratch // Encoders.
|
||||
encTableLocks [64]sync.Mutex // Temporary locks for encoders since they are stateful.
|
||||
decTables [64]*huff0.Decoder // Stateless decoders.
|
||||
)
|
||||
|
||||
const (
|
||||
tableUncompressed = 0
|
||||
tableRLE = 61
|
||||
tableCustom = 62
|
||||
tableReserved = 63
|
||||
)
|
||||
|
||||
// predefined tables as base64 URL encoded string.
|
||||
var tablesData = [64]string{
|
||||
// Uncompressed
|
||||
tableUncompressed: "",
|
||||
// ncw home directory
|
||||
1: "MRDIEtAAMAzDMAzDSjX_ybu0w97bb-L3b2mR-rUl5LXW3lZII43kIDMzM1NXu3okgQs=",
|
||||
// ncw images
|
||||
2: "IhDIAEAA______-Pou_4Sf5z-uS-39MVWjullFLKM7EBECs=",
|
||||
// ncw Google Drive:
|
||||
3: "JxDQAIIBMDMzMwOzbv7nJJCyd_m_9D2llCarnQX33nvvlFKEhUxAAQ==",
|
||||
// Hex
|
||||
4: "ExDoSTD___-tfXfhJ0hKSkryTxU=",
|
||||
// Base64
|
||||
5: "JRDIcQf_______8PgIiIiIgINkggARHlkQwSSCCBxHFYINHdfXI=",
|
||||
|
||||
// Special tables:
|
||||
// Compressed data has its own table.
|
||||
tableCustom: "",
|
||||
// Reserved for extension.
|
||||
tableReserved: "",
|
||||
}
|
||||
|
||||
func initCoders() {
|
||||
initOnce.Do(func() {
|
||||
// Init base 64 decoder.
|
||||
for i, v := range encodeURL {
|
||||
decodeMap[v] = byte(i) + 1
|
||||
}
|
||||
|
||||
// Initialize encoders and decoders.
|
||||
for i, dataString := range tablesData {
|
||||
if len(dataString) == 0 {
|
||||
continue
|
||||
}
|
||||
data, err := base64.URLEncoding.DecodeString(dataString)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
s, _, err := huff0.ReadTable(data, nil)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
// We want to save at least len(in) >> 5
|
||||
s.WantLogLess = 5
|
||||
s.Reuse = huff0.ReusePolicyMust
|
||||
encTables[i] = s
|
||||
decTables[i] = s.Decoder()
|
||||
}
|
||||
// Add custom table type.
|
||||
var s huff0.Scratch
|
||||
s.Reuse = huff0.ReusePolicyNone
|
||||
encTables[tableCustom] = &s
|
||||
decTables[tableCustom] = nil
|
||||
})
|
||||
}
|
||||
Loading…
Reference in a new issue