forked from ironsweet/golucene
/
bufferedChecksumIndexInput.go
65 lines (54 loc) · 1.39 KB
/
bufferedChecksumIndexInput.go
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package store
import (
"fmt"
"hash"
"hash/crc32"
)
/*
Simple implementation of ChecksumIndexInput that wraps another input
and delegates calls.
*/
type BufferedChecksumIndexInput struct {
*ChecksumIndexInputImpl
main IndexInput
digest hash.Hash32
}
func newBufferedChecksumIndexInput(main IndexInput) *BufferedChecksumIndexInput {
ans := &BufferedChecksumIndexInput{
main: main,
digest: crc32.NewIEEE(),
}
ans.ChecksumIndexInputImpl = NewChecksumIndexInput(
fmt.Sprintf("BufferedChecksumIndexInput(%v)", main), ans)
return ans
}
func (in *BufferedChecksumIndexInput) ReadByte() (b byte, err error) {
if b, err = in.main.ReadByte(); err == nil {
in.digest.Write([]byte{b})
}
return
}
func (in *BufferedChecksumIndexInput) ReadBytes(p []byte) (err error) {
if err = in.main.ReadBytes(p); err == nil {
in.digest.Write(p)
}
return
}
func (in *BufferedChecksumIndexInput) Checksum() int64 {
return int64(in.digest.Sum32())
}
func (in *BufferedChecksumIndexInput) Close() error {
return in.main.Close()
}
func (in *BufferedChecksumIndexInput) FilePointer() int64 {
return in.main.FilePointer()
}
func (in *BufferedChecksumIndexInput) Length() int64 {
return in.main.Length()
}
func (in *BufferedChecksumIndexInput) Clone() IndexInput {
panic("not supported")
}
func (in *BufferedChecksumIndexInput) Slice(desc string, offset, length int64) (IndexInput, error) {
panic("not supported")
}