diff options
Diffstat (limited to 'src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NfcReader.kt')
-rw-r--r-- | src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NfcReader.kt | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NfcReader.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NfcReader.kt new file mode 100644 index 000000000..344dd8a0a --- /dev/null +++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NfcReader.kt @@ -0,0 +1,168 @@ +// SPDX-FileCopyrightText: 2023 yuzu Emulator Project +// SPDX-License-Identifier: GPL-3.0-or-later + +package org.yuzu.yuzu_emu.utils + +import android.app.Activity +import android.app.PendingIntent +import android.content.Intent +import android.content.IntentFilter +import android.nfc.NfcAdapter +import android.nfc.Tag +import android.nfc.tech.NfcA +import android.os.Build +import android.os.Handler +import android.os.Looper +import org.yuzu.yuzu_emu.NativeLibrary +import java.io.IOException + +class NfcReader(private val activity: Activity) { + private var nfcAdapter: NfcAdapter? = null + private var pendingIntent: PendingIntent? = null + + fun initialize() { + nfcAdapter = NfcAdapter.getDefaultAdapter(activity) ?: return + + pendingIntent = PendingIntent.getActivity( + activity, + 0, Intent(activity, activity.javaClass), + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) + PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE + else PendingIntent.FLAG_UPDATE_CURRENT + ) + + val tagDetected = IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED) + tagDetected.addCategory(Intent.CATEGORY_DEFAULT) + } + + fun startScanning() { + nfcAdapter?.enableForegroundDispatch(activity, pendingIntent, null, null) + } + + fun stopScanning() { + nfcAdapter?.disableForegroundDispatch(activity) + } + + fun onNewIntent(intent: Intent) { + val action = intent.action + if (NfcAdapter.ACTION_TAG_DISCOVERED != action + && NfcAdapter.ACTION_TECH_DISCOVERED != action + && NfcAdapter.ACTION_NDEF_DISCOVERED != action + ) { + return + } + + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) { + val tag = + intent.getParcelableExtra(NfcAdapter.EXTRA_TAG, Tag::class.java) ?: return + readTagData(tag) + return + } + + val tag = + intent.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG) ?: return + readTagData(tag) + } + + private fun readTagData(tag: Tag) { + if (!tag.techList.contains("android.nfc.tech.NfcA")) { + return + } + + val amiibo = NfcA.get(tag) ?: return + amiibo.connect() + + val tagData = ntag215ReadAll(amiibo) ?: return + NativeLibrary.onReadNfcTag(tagData) + + nfcAdapter?.ignore( + tag, + 1000, + { NativeLibrary.onRemoveNfcTag() }, + Handler(Looper.getMainLooper()) + ) + } + + private fun ntag215ReadAll(amiibo: NfcA): ByteArray? { + val bufferSize = amiibo.maxTransceiveLength; + val tagSize = 0x21C + val pageSize = 4 + val lastPage = tagSize / pageSize - 1 + val tagData = ByteArray(tagSize) + + // We need to read the ntag in steps otherwise we overflow the buffer + for (i in 0..tagSize step bufferSize - 1) { + val dataStart = i / pageSize + var dataEnd = (i + bufferSize) / pageSize + + if (dataEnd > lastPage) { + dataEnd = lastPage + } + + try { + val data = ntag215FastRead(amiibo, dataStart, dataEnd - 1) + System.arraycopy(data, 0, tagData, i, (dataEnd - dataStart) * pageSize) + } catch (e: IOException) { + return null; + } + } + return tagData + } + + private fun ntag215Read(amiibo: NfcA, page: Int): ByteArray? { + return amiibo.transceive( + byteArrayOf( + 0x30.toByte(), + (page and 0xFF).toByte() + ) + ) + } + + private fun ntag215FastRead(amiibo: NfcA, start: Int, end: Int): ByteArray? { + return amiibo.transceive( + byteArrayOf( + 0x3A.toByte(), + (start and 0xFF).toByte(), + (end and 0xFF).toByte() + ) + ) + } + + private fun ntag215PWrite( + amiibo: NfcA, + page: Int, + data1: Int, + data2: Int, + data3: Int, + data4: Int + ): ByteArray? { + return amiibo.transceive( + byteArrayOf( + 0xA2.toByte(), + (page and 0xFF).toByte(), + (data1 and 0xFF).toByte(), + (data2 and 0xFF).toByte(), + (data3 and 0xFF).toByte(), + (data4 and 0xFF).toByte() + ) + ) + } + + private fun ntag215PwdAuth( + amiibo: NfcA, + data1: Int, + data2: Int, + data3: Int, + data4: Int + ): ByteArray? { + return amiibo.transceive( + byteArrayOf( + 0x1B.toByte(), + (data1 and 0xFF).toByte(), + (data2 and 0xFF).toByte(), + (data3 and 0xFF).toByte(), + (data4 and 0xFF).toByte() + ) + ) + } +} |