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IsoPcdA.java
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IsoPcdA.java
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/*
* Copyright (C) 2011 The Android Open Source Project
*
* HOST CARD EMULATION PATCH 0.01
* Author: doug yeager (doug@simplytapp.com)
*
* 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 android.nfc.tech;
import android.nfc.ErrorCodes;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.RemoteException;
import android.util.Log;
import java.io.IOException;
/**
* @hide
* Provides access to ISO-PCD type A (ISO 14443-4) properties and I/O operations on a {@link Tag}.
*
* <p>Acquire an {@link IsoPcdA} object using {@link #get}.
* <p>The primary ISO-PCD type A I/O operation is {@link #transceive}. Applications must
* implement their own protocol stack on top of {@link #transceive}.
*
* <p class="note"><strong>Note:</strong> Methods that perform I/O operations
* require the {@link android.Manifest.permission#NFC} permission.
*/
public final class IsoPcdA extends BasicTagTechnology {
/**
* Get an instance of {@link IsoPcdA} for the given tag.
* <p>Does not cause any RF activity and does not block.
* <p>Returns null if {@link IsoPcdA} was not enumerated in {@link Tag#getTechList}.
* This indicates the tag does not support ISO-PCD type A.
*
* @param tag an ISO-PCD type A compatible PCD
* @return ISO-PCD type A object
*/
public static IsoPcdA get(Tag tag) {
if (!tag.hasTech(TagTechnology.ISO_PCD_A)) return null;
try {
return new IsoPcdA(tag);
} catch (RemoteException e) {
return null;
}
}
/** @hide */
public IsoPcdA(Tag tag)
throws RemoteException {
super(tag, TagTechnology.ISO_PCD_A);
Bundle extras = tag.getTechExtras(TagTechnology.ISO_PCD_A);
}
/**
* Send raw ISO-PCD type A data to the PCD and receive the response.
*
* <p>Applications must only send the INF payload, and not the start of frame and
* end of frame indicators. Applications do not need to fragment the payload, it
* will be automatically fragmented and defragmented by {@link #transceive} if
* it exceeds FSD/FSC limits.
*
* <p>Use {@link #getMaxTransceiveLength} to retrieve the maximum number of bytes
* that can be sent with {@link #transceive}.
*
* <p>This is an I/O operation and will block until complete. It must
* not be called from the main application thread. A blocked call will be canceled with
* {@link IOException} if {@link #close} is called from another thread.
*
* <p class="note">Requires the {@link android.Manifest.permission#NFC} permission.
*
* @param data - on the first call to transceive after PCD activation, the data sent to the method will be ignored
* @return response bytes received, will not be null
* @throws TagLostException if the tag leaves the field
* @throws IOException if there is an I/O failure, or this operation is canceled
*/
public byte[] transceive(byte[] data) throws IOException {
return transceive(data, true);
}
/**
* Return the maximum number of bytes that can be sent with {@link #transceive}.
* @return the maximum number of bytes that can be sent with {@link #transceive}.
*/
public int getMaxTransceiveLength() {
return getMaxTransceiveLengthInternal();
}
}