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Add -fix flag, use fast RS by default

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Evan Su 2024-04-25 22:07:05 -04:00 committed by GitHub
parent 77aea6a8e4
commit 97bde62236
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 26 additions and 14 deletions
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40
cli/v2/picocrypt/main.go
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@ -47,7 +47,10 @@ func rsEncode(rs *infectious.FEC, data []byte) []byte {
return res
}
func rsDecode(rs *infectious.FEC, data []byte) ([]byte, error) {
func rsDecode(rs *infectious.FEC, data []byte, fast bool) ([]byte, error) {
if rs.Total() == 136 && fast {
return data[:128], nil
}
tmp := make([]infectious.Share, rs.Total())
for i := 0; i < rs.Total(); i++ {
tmp[i].Number = i
@ -81,6 +84,7 @@ func work() int {
}
paranoid := flag.Bool("p", false, "")
reedsolo := flag.Bool("r", false, "")
fix := flag.Bool("fix", false, "")
flag.Parse()
mode := ""
@ -327,16 +331,16 @@ func work() int {
errs := make([]error, 10)
version := make([]byte, 15)
fin.Read(version)
_, errs[0] = rsDecode(rs5, version)
_, errs[0] = rsDecode(rs5, version, !(*fix))
tmp := make([]byte, 15)
fin.Read(tmp)
tmp, errs[1] = rsDecode(rs5, tmp)
tmp, errs[1] = rsDecode(rs5, tmp, !(*fix))
commentsLength, _ := strconv.Atoi(string(tmp))
fin.Read(make([]byte, commentsLength*3))
total -= int64(commentsLength) * 3
flags := make([]byte, 15)
fin.Read(flags)
flags, errs[2] = rsDecode(rs5, flags)
flags, errs[2] = rsDecode(rs5, flags, !(*fix))
*paranoid = flags[0] == 1
*reedsolo = flags[3] == 1
padded = flags[4] == 1
@ -349,25 +353,25 @@ func work() int {
}
salt = make([]byte, 48)
fin.Read(salt)
salt, errs[3] = rsDecode(rs16, salt)
salt, errs[3] = rsDecode(rs16, salt, !(*fix))
hkdfSalt = make([]byte, 96)
fin.Read(hkdfSalt)
hkdfSalt, errs[4] = rsDecode(rs32, hkdfSalt)
hkdfSalt, errs[4] = rsDecode(rs32, hkdfSalt, !(*fix))
serpentIV = make([]byte, 48)
fin.Read(serpentIV)
serpentIV, errs[5] = rsDecode(rs16, serpentIV)
serpentIV, errs[5] = rsDecode(rs16, serpentIV, !(*fix))
nonce = make([]byte, 72)
fin.Read(nonce)
nonce, errs[6] = rsDecode(rs24, nonce)
nonce, errs[6] = rsDecode(rs24, nonce, !(*fix))
keyHashRef = make([]byte, 192)
fin.Read(keyHashRef)
keyHashRef, errs[7] = rsDecode(rs64, keyHashRef)
keyHashRef, errs[7] = rsDecode(rs64, keyHashRef, !(*fix))
keyfileHashRef := make([]byte, 96)
fin.Read(keyfileHashRef)
_, errs[8] = rsDecode(rs32, keyfileHashRef)
_, errs[8] = rsDecode(rs32, keyfileHashRef, !(*fix))
authTag = make([]byte, 192)
fin.Read(authTag)
authTag, errs[9] = rsDecode(rs64, authTag)
authTag, errs[9] = rsDecode(rs64, authTag, !(*fix))
for _, err := range errs {
if err != nil {
fin.Close()
@ -487,7 +491,7 @@ func work() int {
src = nil
if len(dst) == MiB/128*136 {
for i := 0; i < MiB/128*136; i += 136 {
tmp, err := rsDecode(rs128, dst[i:i+136])
tmp, err := rsDecode(rs128, dst[i:i+136], !(*fix))
if err != nil {
fin.Close()
fout.Close()
@ -503,7 +507,7 @@ func work() int {
} else {
chunks := len(dst)/136 - 1
for i := 0; i < chunks; i++ {
tmp, err := rsDecode(rs128, dst[i*136:(i+1)*136])
tmp, err := rsDecode(rs128, dst[i*136:(i+1)*136], !(*fix))
if err != nil {
fin.Close()
fout.Close()
@ -513,7 +517,7 @@ func work() int {
}
src = append(src, tmp...)
}
tmp, err := rsDecode(rs128, dst[int(chunks)*136:])
tmp, err := rsDecode(rs128, dst[int(chunks)*136:], !(*fix))
if err != nil {
fin.Close()
fout.Close()
@ -571,6 +575,14 @@ func work() int {
fout.Close()
os.Remove(fout_)
fmt.Println("The input volume is damaged or modified.")
if *reedsolo {
if !(*fix) {
fmt.Println("Fortunately, this volume is encoded with Reed-Solomon.")
fmt.Println("Try again using the -fix flag to repair the corruption.")
} else {
fmt.Println("The corruption could not be fixed with Reed-Solomon.")
}
}
return 1
}
}