top.ibase4j.core.support.security

类 BASE64Decoder

java.lang.Object

top.ibase4j.core.support.security.CharacterDecoder

top.ibase4j.core.support.security.BASE64Decoder

public class BASE64Decoder
extends CharacterDecoder

32 * This class implements a BASE64 Character decoder as specified in RFC1521. 33 * 34 * This RFC is part of the MIME specification which is published by the 35 * Internet Engineering Task Force (IETF). Unlike some other encoding 36 * schemes there is nothing in this encoding that tells the decoder 37 * where a buffer starts or stops, so to use it you will need to isolate 38 * your encoded data into a single chunk and then feed them this decoder. 39 * The simplest way to do that is to read all of the encoded data into a 40 * string and then use: 41 *

  42    *      byte    mydata[];
  43    *      BASE64Decoder base64 = new BASE64Decoder();
  44    *
  45    *      mydata = base64.decodeBuffer(bufferString);
  46    * 

47 * This will decode the String in bufferString and give you an array 48 * of bytes in the array myData. 49 * 50 * On errors, this class throws a CEFormatException with the following detail 51 * strings: 52 *

  53    *    "BASE64Decoder: Not enough bytes for an atom."
  54    * 

55 * 56 * @author Chuck McManis 57 * @see CharacterEncoder 58 * @see BASE64Decoder 59

构造器概要

构造器

构造器和说明
BASE64Decoder()

方法概要

限定符和类型	方法和说明
protected int	bytesPerAtom() This class has 4 bytes per atom
protected int	bytesPerLine() Any multiple of 4 will do, 72 might be common
protected void	decodeAtom(PushbackInputStream inStream, OutputStream outStream, int rem) 103 * Decode one BASE64 atom into 1, 2, or 3 bytes of data. 104

从类继承的方法 top.ibase4j.core.support.security.CharacterDecoder

decodeBuffer, decodeBuffer, decodeBuffer, decodeBufferPrefix, decodeBufferSuffix, decodeBufferToByteBuffer, decodeBufferToByteBuffer, decodeLinePrefix, decodeLineSuffix, readFully

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

BASE64Decoder

public BASE64Decoder()

方法详细资料

bytesPerAtom

protected int bytesPerAtom()

This class has 4 bytes per atom

指定者:

bytesPerAtom 在类中 CharacterDecoder

bytesPerLine

protected int bytesPerLine()

Any multiple of 4 will do, 72 might be common

指定者:

bytesPerLine 在类中 CharacterDecoder

decodeAtom

protected void decodeAtom(PushbackInputStream inStream,
                          OutputStream outStream,
                          int rem)
                   throws IOException

103 * Decode one BASE64 atom into 1, 2, or 3 bytes of data. 104

覆盖:

decodeAtom 在类中 CharacterDecoder

抛出:

IOException