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/*
* Copyright(C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.javacard.keymaster;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.Util;
/**
* KMTextString represents contiguous block of bytes. It corresponds to CBOR type of Text String. It
* extends KMByteBlob by specifying value field as zero or more sequence of bytes. struct{ byte
* TEXT_STR_TYPE; short length; sequence of bytes}
*/
public class KMTextString extends KMByteBlob {
private static byte OFFSET_SIZE = 2;
private static KMTextString prototype;
private KMTextString() {}
private static KMTextString proto(short ptr) {
if (prototype == null) {
prototype = new KMTextString();
}
instanceTable[KM_TEXT_STRING_OFFSET] = ptr;
return prototype;
}
// pointer to an empty instance used as expression
public static short exp() {
return KMType.exp(TEXT_STRING_TYPE);
}
// return an empty byte blob instance
public static short instance(short length) {
short ptr = KMType.instance(TEXT_STRING_TYPE, (short) (length + OFFSET_SIZE));
Util.setShort(
heap, (short) (ptr + TLV_HEADER_SIZE), (short) (ptr + TLV_HEADER_SIZE + OFFSET_SIZE));
Util.setShort(heap, (short) (ptr + 1), length);
return ptr;
}
// byte blob from existing buf
public static short instance(byte[] buf, short startOff, short length) {
short ptr = instance(length);
Util.arrayCopyNonAtomic(
buf, startOff, heap, (short) (ptr + TLV_HEADER_SIZE + OFFSET_SIZE), length);
return ptr;
}
// cast the ptr to KMTextString
public static KMTextString cast(short ptr) {
if (heap[ptr] != TEXT_STRING_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
if (Util.getShort(heap, (short) (ptr + 1)) == INVALID_VALUE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
protected short getBaseOffset() {
return instanceTable[KM_TEXT_STRING_OFFSET];
}
}
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