1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.hardware.camera2.impl; 17 18 import java.nio.ByteBuffer; 19 import java.nio.charset.Charset; 20 21 public class MetadataMarshalString implements MetadataMarshalClass<String> { 22 23 private static final Charset UTF8_CHARSET = Charset.forName("UTF-8"); 24 25 @Override 26 public int marshal(String value, ByteBuffer buffer, int nativeType, boolean sizeOnly) { 27 byte[] arr = value.getBytes(UTF8_CHARSET); 28 29 if (!sizeOnly) { 30 buffer.put(arr); 31 buffer.put((byte)0); // metadata strings are NULL-terminated 32 } 33 34 return arr.length + 1; 35 } 36 37 @Override 38 public String unmarshal(ByteBuffer buffer, int nativeType) { 39 40 buffer.mark(); // save the current position 41 42 boolean foundNull = false; 43 int stringLength = 0; 44 while (buffer.hasRemaining()) { 45 if (buffer.get() == (byte)0) { 46 foundNull = true; 47 break; 48 } 49 50 stringLength++; 51 } 52 if (!foundNull) { 53 throw new IllegalArgumentException("Strings must be null-terminated"); 54 } 55 56 buffer.reset(); // go back to the previously marked position 57 58 byte[] strBytes = new byte[stringLength + 1]; 59 buffer.get(strBytes, /*dstOffset*/0, stringLength + 1); // including null character 60 61 // not including null character 62 return new String(strBytes, /*offset*/0, stringLength, UTF8_CHARSET); 63 } 64 65 @Override 66 public Class<String> getMarshalingClass() { 67 return String.class; 68 } 69 70 @Override 71 public boolean isNativeTypeSupported(int nativeType) { 72 return nativeType == CameraMetadataNative.TYPE_BYTE; 73 } 74 75 @Override 76 public int getNativeSize(int nativeType) { 77 return NATIVE_SIZE_DYNAMIC; 78 } 79 } 80
