Class BundleHelper

java.lang.Object

org.brotli.integration.BundleHelper

public class BundleHelper
extends Object

Utilities to work test files bundles in zip archive.

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	CRC_64_POLY	ECMA CRC64 polynomial.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	BundleHelper()

Method Summary

Modifier and Type	Method	Description
static long	fingerprintStream(InputStream input)	Calculates CRC64 of stream contents.
static long	getExpectedFingerprint(String entryName)
static List<String>	listEntries(InputStream input)
static byte[]	readEntry(InputStream input, String entryName)
static byte[]	readStream(InputStream input)
static long	updateCrc64(long crc, byte[] data, int offset, int length)	Rolls CRC64 calculation.

Methods inherited from class Object

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

Field Details

CRC_64_POLY

private static final long CRC_64_POLY

ECMA CRC64 polynomial.

Constructor Details

BundleHelper

private BundleHelper()

Method Details

listEntries

public static List<String> listEntries(InputStream input)
                                throws IOException

Throws:

IOException

readStream

public static byte[] readStream(InputStream input)
                         throws IOException

Throws:

IOException

readEntry

public static byte[] readEntry(InputStream input,
 String entryName)
                        throws IOException

Throws:

IOException

updateCrc64

public static long updateCrc64(long crc,
 byte[] data,
 int offset,
 int length)

Rolls CRC64 calculation.

CRC64(data) = -1 ^ updateCrc64((... updateCrc64(-1, firstBlock), ...), lastBlock);

This simple and reliable checksum is chosen to make is easy to calculate the same value across the variety of languages (C++, Java, Go, ...).

fingerprintStream

public static long fingerprintStream(InputStream input)
                              throws IOException

Calculates CRC64 of stream contents.

Throws:

IOException

getExpectedFingerprint

public static long getExpectedFingerprint(String entryName)