package org.bouncycastle.asn1; import java.io.IOException; import org.bouncycastle.util.Arrays; import org.bouncycastle.util.Strings; /** * DER PrintableString object. */ public class DERPrintableString extends ASN1Primitive implements ASN1String { private byte[] string; /** * return a printable string from the passed in object. * * @param obj a DERPrintableString or an object that can be converted into one. * @exception IllegalArgumentException if the object cannot be converted. * @return a DERPrintableString instance, or null. */ public static DERPrintableString getInstance( Object obj) { if (obj == null || obj instanceof DERPrintableString) { return (DERPrintableString)obj; } if (obj instanceof byte[]) { try { return (DERPrintableString)fromByteArray((byte[])obj); } catch (Exception e) { throw new IllegalArgumentException("encoding error in getInstance: " + e.toString()); } } throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); } /** * return a Printable 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. * @return a DERPrintableString instance, or null. */ public static DERPrintableString getInstance( ASN1TaggedObject obj, boolean explicit) { ASN1Primitive o = obj.getObject(); if (explicit || o instanceof DERPrintableString) { return getInstance(o); } else { return new DERPrintableString(ASN1OctetString.getInstance(o).getOctets()); } } /** * basic constructor - byte encoded string. */ DERPrintableString( byte[] string) { this.string = string; } /** * basic constructor - this does not validate the string */ public DERPrintableString( String string) { this(string, false); } /** * Constructor with optional validation. * * @param string the base string to wrap. * @param validate whether or not to check the string. * @throws IllegalArgumentException if validate is true and the string * contains characters that should not be in a PrintableString. */ public DERPrintableString( String string, boolean validate) { if (validate && !isPrintableString(string)) { throw new IllegalArgumentException("string contains illegal characters"); } this.string = Strings.toByteArray(string); } public String getString() { return Strings.fromByteArray(string); } public byte[] getOctets() { return Arrays.clone(string); } boolean isConstructed() { return false; } int encodedLength() { return 1 + StreamUtil.calculateBodyLength(string.length) + string.length; } void encode( ASN1OutputStream out) throws IOException { out.writeEncoded(BERTags.PRINTABLE_STRING, string); } public int hashCode() { return Arrays.hashCode(string); } boolean asn1Equals( ASN1Primitive o) { if (!(o instanceof DERPrintableString)) { return false; } DERPrintableString s = (DERPrintableString)o; return Arrays.areEqual(string, s.string); } public String toString() { return getString(); } /** * return true if the passed in String can be represented without * loss as a PrintableString, false otherwise. * * @return true if in printable set, false otherwise. */ public static boolean isPrintableString( String str) { for (int i = str.length() - 1; i >= 0; i--) { char ch = str.charAt(i); if (ch > 0x007f) { return false; } if ('a' <= ch && ch <= 'z') { continue; } if ('A' <= ch && ch <= 'Z') { continue; } if ('0' <= ch && ch <= '9') { continue; } switch (ch) { case ' ': case '\'': case '(': case ')': case '+': case '-': case '.': case ':': case '=': case '?': case '/': case ',': continue; } return false; } return true; } }