| // Copyright 2021 The Bazel Authors. All rights reserved. |
| // |
| // 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 com.google.devtools.build.lib.remote.zstd; |
| |
| import com.github.luben.zstd.ZstdInputStreamNoFinalizer; |
| import com.google.protobuf.ByteString; |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| /** An {@link OutputStream} that use zstd to decompress the content. */ |
| public final class ZstdDecompressingOutputStream extends OutputStream { |
| private final OutputStream out; |
| private ByteArrayInputStream inner; |
| private final ZstdInputStreamNoFinalizer zis; |
| |
| public ZstdDecompressingOutputStream(OutputStream out) throws IOException { |
| this.out = out; |
| zis = |
| new ZstdInputStreamNoFinalizer( |
| new InputStream() { |
| @Override |
| public int read() { |
| return inner.read(); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) { |
| return inner.read(b, off, len); |
| } |
| }) |
| .setContinuous(true); |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| write(new byte[] {(byte) b}, 0, 1); |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| write(b, 0, b.length); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| inner = new ByteArrayInputStream(b, off, len); |
| byte[] data = ByteString.readFrom(zis).toByteArray(); |
| out.write(data, 0, data.length); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| closeShallow(); |
| out.close(); |
| } |
| |
| /** |
| * Free resources related to decompression without closing the underlying {@link OutputStream}. |
| */ |
| public void closeShallow() throws IOException { |
| zis.close(); |
| } |
| } |