spring ZipHeaderPeekInputStream 源码
springboot ZipHeaderPeekInputStream 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/ZipHeaderPeekInputStream.java
/*
* Copyright 2012-2020 the original author or 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.
*/
package org.springframework.boot.loader.tools;
import java.io.ByteArrayInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
/**
* {@link InputStream} that can peek ahead at zip header bytes.
*
* @author Phillip Webb
*/
class ZipHeaderPeekInputStream extends FilterInputStream {
private static final byte[] ZIP_HEADER = new byte[] { 0x50, 0x4b, 0x03, 0x04 };
private final byte[] header;
private final int headerLength;
private int position;
private ByteArrayInputStream headerStream;
protected ZipHeaderPeekInputStream(InputStream in) throws IOException {
super(in);
this.header = new byte[4];
this.headerLength = in.read(this.header);
this.headerStream = new ByteArrayInputStream(this.header, 0, this.headerLength);
}
@Override
public int read() throws IOException {
int read = (this.headerStream != null) ? this.headerStream.read() : -1;
if (read != -1) {
this.position++;
if (this.position >= this.headerLength) {
this.headerStream = null;
}
return read;
}
return super.read();
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int read = (this.headerStream != null) ? this.headerStream.read(b, off, len) : -1;
if (read <= 0) {
return readRemainder(b, off, len);
}
this.position += read;
if (read < len) {
int remainderRead = readRemainder(b, off + read, len - read);
if (remainderRead > 0) {
read += remainderRead;
}
}
if (this.position >= this.headerLength) {
this.headerStream = null;
}
return read;
}
boolean hasZipHeader() {
return Arrays.equals(this.header, ZIP_HEADER);
}
private int readRemainder(byte[] b, int off, int len) throws IOException {
int read = super.read(b, off, len);
if (read > 0) {
this.position += read;
}
return read;
}
}
相关信息
相关文章
spring BuildPropertiesWriter 源码
spring DefaultLayoutFactory 源码
0
赞
- 所属分类： 后端技术
- 本文标签： Java Spring Spring Boot
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦