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prog: mutate fixed-size strings more

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Allow removing/inserting ranges of bytes from fixed-size strings,
provided we truncate/extend resulting string to keep original size.
This commit is contained in:
Dmitry Vyukov 2018-06-12 19:09:26 +02:00
parent 6fb8a0255e
commit 598eb19243
1 changed files with 4 additions and 4 deletions
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8
prog/mutation.go
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@ -415,7 +415,7 @@ var mutateDataFuncs = [...]func(r *randGen, data []byte, minLen, maxLen uint64)
},
// Insert random bytes.
func(r *randGen, data []byte, minLen, maxLen uint64) ([]byte, bool) {
if len(data) == 0 || uint64(len(data)) >= maxLen {
if len(data) == 0 {
return data, false
}
n := r.Intn(16) + 1
@ -430,14 +430,14 @@ var mutateDataFuncs = [...]func(r *randGen, data []byte, minLen, maxLen uint64)
for i := 0; i < n; i++ {
data[pos+i] = byte(r.Int31())
}
if r.bin() {
if uint64(len(data)) > maxLen || r.bin() {
data = data[:len(data)-n] // preserve original length
}
return data, true
},
// Remove bytes.
func(r *randGen, data []byte, minLen, maxLen uint64) ([]byte, bool) {
if uint64(len(data)) <= minLen {
if len(data) == 0 {
return data, false
}
n := r.Intn(16) + 1
@ -450,7 +450,7 @@ var mutateDataFuncs = [...]func(r *randGen, data []byte, minLen, maxLen uint64)
}
copy(data[pos:], data[pos+n:])
data = data[:len(data)-n]
if r.bin() {
if uint64(len(data)) < minLen || r.bin() {
for i := 0; i < n; i++ {
data = append(data, 0) // preserve original length
}