MarshalQueryableString.java revision 3c40a046cf0ea7b6af01ec93e5276eccb3234bfe
13c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin/* 23c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * Copyright (C) 2014 The Android Open Source Project 33c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * 43c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * Licensed under the Apache License, Version 2.0 (the "License"); 53c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * you may not use this file except in compliance with the License. 63c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * You may obtain a copy of the License at 73c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * 83c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * http://www.apache.org/licenses/LICENSE-2.0 93c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * 103c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * Unless required by applicable law or agreed to in writing, software 113c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * distributed under the License is distributed on an "AS IS" BASIS, 123c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 133c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * See the License for the specific language governing permissions and 143c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * limitations under the License. 153c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin */ 163c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinpackage android.hardware.camera2.marshal.impl; 173c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 183c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport android.hardware.camera2.marshal.Marshaler; 193c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport android.hardware.camera2.marshal.MarshalQueryable; 203c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport android.hardware.camera2.utils.TypeReference; 213c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport android.util.Log; 223c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 233c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport java.nio.ByteBuffer; 243c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport java.nio.charset.Charset; 253c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 263c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinimport static android.hardware.camera2.impl.CameraMetadataNative.*; 273c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 283c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin/** 293c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin * Marshal {@link String} to/from {@link #TYPE_BYTE}. 303c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin */ 313c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkinpublic class MarshalQueryableString implements MarshalQueryable<String> { 323c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 333c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin private static final String TAG = MarshalQueryableString.class.getSimpleName(); 343c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin private static final boolean VERBOSE = Log.isLoggable(TAG, Log.VERBOSE); 353c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 363c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin private static final Charset UTF8_CHARSET = Charset.forName("UTF-8"); 373c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin private static final byte NUL = (byte)'\0'; // used as string terminator 383c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 393c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin private class MarshalerString extends Marshaler<String> { 403c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 413c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin protected MarshalerString(TypeReference<String> typeReference, int nativeType) { 423c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin super(MarshalQueryableString.this, typeReference, nativeType); 433c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 443c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 453c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 463c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public void marshal(String value, ByteBuffer buffer) { 473c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin byte[] arr = value.getBytes(UTF8_CHARSET); 483c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 493c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin buffer.put(arr); 503c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin buffer.put(NUL); // metadata strings are NUL-terminated 513c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 523c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 533c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 543c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public int calculateMarshalSize(String value) { 553c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin byte[] arr = value.getBytes(UTF8_CHARSET); 563c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 573c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin return arr.length + 1; // metadata strings are NUL-terminated 583c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 593c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 603c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 613c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public String unmarshal(ByteBuffer buffer) { 623c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin buffer.mark(); // save the current position 633c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 643c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin boolean foundNull = false; 653c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin int stringLength = 0; 663c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin while (buffer.hasRemaining()) { 673c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin if (buffer.get() == NUL) { 683c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin foundNull = true; 693c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin break; 703c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 713c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 723c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin stringLength++; 733c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 743c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 753c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin if (VERBOSE) { 763c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin Log.v(TAG, 773c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin "unmarshal - scanned " + stringLength + " characters; found null? " 783c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin + foundNull); 793c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 803c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 813c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin if (!foundNull) { 823c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin throw new UnsupportedOperationException("Strings must be null-terminated"); 833c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 843c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 853c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin buffer.reset(); // go back to the previously marked position 863c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 873c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin byte[] strBytes = new byte[stringLength + 1]; 883c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin buffer.get(strBytes, /*dstOffset*/0, stringLength + 1); // including null character 893c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 903c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin // not including null character 913c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin return new String(strBytes, /*offset*/0, stringLength, UTF8_CHARSET); 923c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 933c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 943c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 953c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public int getNativeSize() { 963c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin return NATIVE_SIZE_DYNAMIC; 973c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 983c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 993c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 1003c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 1013c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public Marshaler<String> createMarshaler( 1023c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin TypeReference<String> managedType, int nativeType) { 1033c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin return new MarshalerString(managedType, nativeType); 1043c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 1053c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin 1063c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin @Override 1073c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin public boolean isTypeMappingSupported(TypeReference<String> managedType, int nativeType) { 1083c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin return nativeType == TYPE_BYTE && String.class.equals(managedType.getType()); 1093c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin } 1103c40a046cf0ea7b6af01ec93e5276eccb3234bfeIgor Murashkin} 111