com.alipay.sofa.ark.loader.jar

类 CentralDirectoryEndRecord

java.lang.Object

com.alipay.sofa.ark.loader.jar.CentralDirectoryEndRecord

public final class CentralDirectoryEndRecord
extends Object

A ZIP File "End of central directory record" (EOCD).

作者:

Phillip Webb, Andy Wilkinson

另请参阅:

Zip File Format

构造器概要

构造器

构造器和说明
CentralDirectoryEndRecord(RandomAccessData data) Create a new CentralDirectoryEndRecord instance from the specified RandomAccessData, searching backwards from the end until a valid block is located.

方法概要

限定符和类型	方法和说明
RandomAccessData	getCentralDirectory(RandomAccessData data) Return the bytes of the "Central directory" based on the offset indicated in this record.
int	getNumberOfRecords() Return the number of ZIP entries in the file.
long	getStartOfArchive(RandomAccessData data) Returns the location in the data that the archive actually starts.
boolean	isValid()

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

CentralDirectoryEndRecord

public CentralDirectoryEndRecord(RandomAccessData data)
                          throws IOException

Create a new CentralDirectoryEndRecord instance from the specified RandomAccessData, searching backwards from the end until a valid block is located.

参数:

data - the source data

抛出:

IOException - in case of I/O errors

方法详细资料

isValid

public boolean isValid()

getStartOfArchive

public long getStartOfArchive(RandomAccessData data)

Returns the location in the data that the archive actually starts. For most files the archive data will start at 0, however, it is possible to have prefixed bytes (often used for startup scripts) at the beginning of the data.

参数:

data - the source data

返回:

the offset within the data where the archive begins

getCentralDirectory

public RandomAccessData getCentralDirectory(RandomAccessData data)

Return the bytes of the "Central directory" based on the offset indicated in this record.

参数:

data - the source data

返回:

the central directory data

getNumberOfRecords

public int getNumberOfRecords()

Return the number of ZIP entries in the file.

返回:

the number of records in the zip