package storage import ( "github.com/aszxqw/weed-fs/go/util" "fmt" "hash/crc32" ) var table = crc32.MakeTable(crc32.Castagnoli) type CRC uint32 func NewCRC(b []byte) CRC { return CRC(0).Update(b) } func (c CRC) Update(b []byte) CRC { return CRC(crc32.Update(uint32(c), table, b)) } func (c CRC) Value() uint32 { return uint32(c>>15|c<<17) + 0xa282ead8 } func (n *Needle) Etag() string { bits := make([]byte, 4) util.Uint32toBytes(bits, uint32(n.Checksum)) return fmt.Sprintf("\"%x\"", bits) }