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Jae/fixprefixdb (#199)

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* Fix PrefixDB Iterator
* PrefixDB Iterator/ReverseIterator fixes
* Bump version 0.8.2
* Update CHANGELOG.md about DebugDB
* Keep invalid source to be closed
* Use prefixBatch instead of memBatch
This commit is contained in:
Jae Kwon
2018-04-21 04:25:45 -07:00
committed by GitHub
parent 357648b8d6
commit e328006bfe
11 changed files with 360 additions and 103 deletions
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38
db/util.go
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@ -33,6 +33,29 @@ func cpIncr(bz []byte) (ret []byte) {
return nil
}
// Returns a slice of the same length (big endian)
// except decremented by one.
// Returns nil on underflow (e.g. if bz bytes are all 0x00)
// CONTRACT: len(bz) > 0
func cpDecr(bz []byte) (ret []byte) {
if len(bz) == 0 {
panic("cpDecr expects non-zero bz length")
}
ret = cp(bz)
for i := len(bz) - 1; i >= 0; i-- {
if ret[i] > byte(0x00) {
ret[i]--
return
}
ret[i] = byte(0xFF)
if i == 0 {
// Underflow
return nil
}
}
return nil
}
// See DB interface documentation for more information.
func IsKeyInDomain(key, start, end []byte, isReverse bool) bool {
if !isReverse {
@ -43,12 +66,13 @@ func IsKeyInDomain(key, start, end []byte, isReverse bool) bool {
return false
}
return true
} else {
if start != nil && bytes.Compare(start, key) < 0 {
return false
}
if end != nil && bytes.Compare(key, end) <= 0 {
return false
}
return true
}
if start != nil && bytes.Compare(start, key) < 0 {
return false
}
if end != nil && bytes.Compare(key, end) <= 0 {
return false
}
return true
}