diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/s2/dict.go')
| -rw-r--r-- | vendor/github.com/klauspost/compress/s2/dict.go | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/vendor/github.com/klauspost/compress/s2/dict.go b/vendor/github.com/klauspost/compress/s2/dict.go index 24f7ce80b..f125ad096 100644 --- a/vendor/github.com/klauspost/compress/s2/dict.go +++ b/vendor/github.com/klauspost/compress/s2/dict.go @@ -106,6 +106,25 @@ func MakeDict(data []byte, searchStart []byte) *Dict { return &d } +// MakeDictManual will create a dictionary. +// 'data' must be at least MinDictSize and less than or equal to MaxDictSize. +// A manual first repeat index into data must be provided. +// It must be less than len(data)-8. +func MakeDictManual(data []byte, firstIdx uint16) *Dict { + if len(data) < MinDictSize || int(firstIdx) >= len(data)-8 || len(data) > MaxDictSize { + return nil + } + var d Dict + dict := data + d.dict = dict + if cap(d.dict) < len(d.dict)+16 { + d.dict = append(make([]byte, 0, len(d.dict)+16), d.dict...) + } + + d.repeat = int(firstIdx) + return &d +} + // Encode returns the encoded form of src. The returned slice may be a sub- // slice of dst if dst was large enough to hold the entire encoded block. // Otherwise, a newly allocated slice will be returned. |