DERUTF8String.java
资源名称:security.rar [点击查看]
上传用户:lior1029
上传日期:2013-05-07
资源大小:209k
文件大小:4k
源码类别:
CA认证
开发平台:
Java
- package org.bouncycastle.asn1;
- import java.io.*;
- /**
- * DER UTF8String object.
- */
- public class DERUTF8String
- extends DERObject
- implements DERString
- {
- String string;
- /**
- * return an UTF8 string from the passed in object.
- *
- * @exception IllegalArgumentException if the object cannot be converted.
- */
- public static DERUTF8String getInstance(
- Object obj)
- {
- if (obj == null || obj instanceof DERUTF8String)
- {
- return (DERUTF8String)obj;
- }
- if (obj instanceof ASN1OctetString)
- {
- return new DERUTF8String(((ASN1OctetString)obj).getOctets());
- }
- if (obj instanceof ASN1TaggedObject)
- {
- return getInstance(((ASN1TaggedObject)obj).getObject());
- }
- throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
- }
- /**
- * return an UTF8 String from a tagged object.
- *
- * @param obj the tagged object holding the object we want
- * @param explicit true if the object is meant to be explicitly
- * tagged false otherwise.
- * @exception IllegalArgumentException if the tagged object cannot
- * be converted.
- */
- public static DERUTF8String getInstance(
- ASN1TaggedObject obj,
- boolean explicit)
- {
- return getInstance(obj.getObject());
- }
- /**
- * basic constructor - byte encoded string.
- */
- DERUTF8String(
- byte[] string)
- {
- int i = 0;
- int length = 0;
- while (i < string.length)
- {
- length++;
- if ((string[i] & 0xe0) == 0xe0)
- {
- i += 3;
- }
- else if ((string[i] & 0xc0) == 0xc0)
- {
- i += 2;
- }
- else
- {
- i += 1;
- }
- }
- char[] cs = new char[length];
- i = 0;
- length = 0;
- while (i < string.length)
- {
- char ch;
- if ((string[i] & 0xe0) == 0xe0)
- {
- ch = (char)(((string[i] & 0x1f) << 12)
- | ((string[i + 1] & 0x3f) << 6) | (string[i + 2] & 0x3f));
- i += 3;
- }
- else if ((string[i] & 0xc0) == 0xc0)
- {
- ch = (char)(((string[i] & 0x3f) << 6) | (string[i + 1] & 0x3f));
- i += 2;
- }
- else
- {
- ch = (char)(string[i] & 0xff);
- i += 1;
- }
- cs[length++] = ch;
- }
- this.string = new String(cs);
- }
- /**
- * basic constructor
- */
- public DERUTF8String(
- String string)
- {
- this.string = string;
- }
- public String getString()
- {
- return string;
- }
- public int hashCode()
- {
- return this.getString().hashCode();
- }
- public boolean equals(
- Object o)
- {
- if (!(o instanceof DERUTF8String))
- {
- return false;
- }
- DERUTF8String s = (DERUTF8String)o;
- return this.getString().equals(s.getString());
- }
- void encode(
- DEROutputStream out)
- throws IOException
- {
- char[] c = string.toCharArray();
- ByteArrayOutputStream bOut = new ByteArrayOutputStream();
- for (int i = 0; i != c.length; i++)
- {
- char ch = c[i];
- if (ch < 0x0080)
- {
- bOut.write(ch);
- }
- else if (ch < 0x0800)
- {
- bOut.write(0xc0 | (ch >> 6));
- bOut.write(0x80 | (ch & 0x3f));
- }
- else
- {
- bOut.write(0xe0 | (ch >> 12));
- bOut.write(0x80 | ((ch >> 6) & 0x3F));
- bOut.write(0x80 | (ch & 0x3F));
- }
- }
- out.writeEncoded(UTF8_STRING, bOut.toByteArray());
- }
- }