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- // Copyright (c) 2017 Couchbase, Inc.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package zap
-
- import (
- "hash/crc32"
- "io"
-
- segment "github.com/blevesearch/scorch_segment_api/v2"
- )
-
- // CountHashWriter is a wrapper around a Writer which counts the number of
- // bytes which have been written and computes a crc32 hash
- type CountHashWriter struct {
- w io.Writer
- crc uint32
- n int
- s segment.StatsReporter
- }
-
- // NewCountHashWriter returns a CountHashWriter which wraps the provided Writer
- func NewCountHashWriter(w io.Writer) *CountHashWriter {
- return &CountHashWriter{w: w}
- }
-
- func NewCountHashWriterWithStatsReporter(w io.Writer, s segment.StatsReporter) *CountHashWriter {
- return &CountHashWriter{w: w, s: s}
- }
-
- // Write writes the provided bytes to the wrapped writer and counts the bytes
- func (c *CountHashWriter) Write(b []byte) (int, error) {
- n, err := c.w.Write(b)
- c.crc = crc32.Update(c.crc, crc32.IEEETable, b[:n])
- c.n += n
- if c.s != nil {
- c.s.ReportBytesWritten(uint64(n))
- }
- return n, err
- }
-
- // Count returns the number of bytes written
- func (c *CountHashWriter) Count() int {
- return c.n
- }
-
- // Sum32 returns the CRC-32 hash of the content written to this writer
- func (c *CountHashWriter) Sum32() uint32 {
- return c.crc
- }
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