blob: 08e8bcbf51fba15b30ccc210f7233103815fe49e [file] [log] [blame]
// Copyright 2019 The Wuffs Authors.
//
// 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
//
// https://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.
//go:build !cgo
// +build !cgo
package raczlib
import (
"compress/zlib"
"io"
"github.com/google/wuffs/lib/compression"
)
func (r *CodecReader) makeDecompressor(compressed io.Reader, dict []byte) (io.Reader, error) {
if r.cachedReader != nil {
if err := r.cachedReader.Reset(compressed, dict); err != nil {
return nil, err
}
return r.cachedReader, nil
}
zlibReader, err := zlib.NewReaderDict(compressed, dict)
if err != nil {
return nil, err
}
r.cachedReader = zlibReader.(compression.Reader)
return zlibReader, nil
}