/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.midp.publickeystore;
import java.io.*;
/**
* Retrieves stored fields from an InputStream.
* Since Java Microedition has no serialization, this is a simple substitute.
*/
class InputStorage extends Storage {
/** stream to read from */
private DataInputStream in;
/**
* Constructs an InputStorage for an InputStream.
* @param input the input storage input stream.
* @exception IOException if the storage version cannot be read
*/
InputStorage(InputStream input) throws IOException {
in = new DataInputStream(input);
// skip past the version number.
in.readByte();
}
/**
* Reads a field that was stored as tag, type, value set.
* @param tag byte array of one byte to hold the tag of the field that
* was read
* @return value of field that was stored, or null if there are no more
* fields
* @exception IOException if the input storage was corrupted
*/
Object readValue(byte[] tag) throws IOException {
byte type;
try {
try {
in.readFully(tag, 0, 1);
} catch (EOFException eofe) {
// this just means there are no more fields in storage
return null;
}
type = in.readByte();
if (type == BINARY_TYPE) {
int len;
byte[] value;
/*
* must read the length first, because DataOutputStream does
* not handle handle byte arrays.
*/
len = in.readUnsignedShort();
if (len < 0) {
throw new IOException();
}
value = new byte[len];
in.readFully(value);
return value;
}
if (type == STRING_TYPE) {
return in.readUTF();
}
if (type == LONG_TYPE) {
return new Long(in.readLong());
}
if (type == BOOLEAN_TYPE) {
return new Boolean(in.readBoolean());
}
throw new IOException();
} catch (IOException e) {
throw new IOException("input storage corrupted");
}
}
}
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