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