| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * https://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 org.apache.directory.api.ldap.model.schema.syntaxCheckers; |
| |
| |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.ldap.model.constants.SchemaConstants; |
| import org.apache.directory.api.ldap.model.schema.SyntaxChecker; |
| |
| |
| /** |
| * A SyntaxChecker which verifies that a value is a Jpeg according to RFC 4517. |
| * <p> |
| * The JFIF (Jpeg File Interchange Format) specify that a jpeg image starts with |
| * the following bytes : |
| * <pre> |
| * 0xFF 0xD8 (SOI, Start Of Image) |
| * 0xFF 0xE0 (App0 for JFIF) or 0xDD 0xE1 (App1 for Exif) |
| * 0xNN 0xNN (Header length) |
| * "JFIF\0" (JFIF string with an ending \0) |
| * some other bytes which are related to the image. |
| * </pre> |
| * |
| * We will check for those 11 bytes, except the length. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| @SuppressWarnings("serial") |
| public final class JpegSyntaxChecker extends SyntaxChecker |
| { |
| /** |
| * A static instance of JpegSyntaxChecker |
| */ |
| public static final JpegSyntaxChecker INSTANCE = new JpegSyntaxChecker( SchemaConstants.JPEG_SYNTAX ); |
| |
| /** |
| * A static Builder for this class |
| */ |
| public static final class Builder extends SCBuilder<JpegSyntaxChecker> |
| { |
| /** |
| * The Builder constructor |
| */ |
| private Builder() |
| { |
| super( SchemaConstants.JPEG_SYNTAX ); |
| } |
| |
| |
| /** |
| * Create a new instance of JpegSyntaxChecker |
| * @return A new instance of JpegSyntaxChecker |
| */ |
| @Override |
| public JpegSyntaxChecker build() |
| { |
| return new JpegSyntaxChecker( oid ); |
| } |
| } |
| |
| |
| /** |
| * Creates a new instance of JpegSyntaxChecker. |
| * |
| * @param oid The OID to use for this SyntaxChecker |
| */ |
| private JpegSyntaxChecker( String oid ) |
| { |
| super( oid ); |
| } |
| |
| |
| /** |
| * @return An instance of the Builder for this class |
| */ |
| public static Builder builder() |
| { |
| return new Builder(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean isValidSyntax( Object value ) |
| { |
| if ( value == null ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.err( I18n.ERR_13210_SYNTAX_INVALID, "null" ) ); |
| } |
| |
| return false; |
| } |
| |
| // The value must be a byte array |
| if ( !( value instanceof byte[] ) ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.err( I18n.ERR_13210_SYNTAX_INVALID, value ) ); |
| } |
| |
| return false; |
| } |
| |
| byte[] bytes = ( byte[] ) value; |
| |
| // The header must be at least 11 bytes long |
| if ( bytes.length < 11 ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.err( I18n.ERR_13210_SYNTAX_INVALID, value ) ); |
| } |
| |
| return false; |
| } |
| |
| // SOI or APP0 or APP1 format |
| if ( ( bytes[0] == ( byte ) 0x00FF ) |
| && ( bytes[1] == ( byte ) 0x00D8 ) |
| && ( bytes[2] == ( byte ) 0x00FF ) ) |
| { |
| // JFIF format |
| if ( ( bytes[3] == ( byte ) 0x00E0 ) |
| && ( bytes[6] == 'J' ) |
| && ( bytes[7] == 'F' ) |
| && ( bytes[8] == 'I' ) |
| && ( bytes[9] == 'F' ) |
| && ( bytes[10] == 0x00 ) ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.msg( I18n.MSG_13701_SYNTAX_VALID, value ) ); |
| } |
| |
| return true; |
| } |
| // EXIF Format |
| else if ( ( bytes[3] == ( byte ) 0x00E1 ) |
| && ( bytes[6] == 'E' ) |
| && ( bytes[7] == 'x' ) |
| && ( bytes[8] == 'i' ) |
| && ( bytes[9] == 'f' ) |
| && ( bytes[10] == 0x00 ) ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.msg( I18n.MSG_13701_SYNTAX_VALID, value ) ); |
| } |
| |
| return true; |
| } |
| } |
| |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.err( I18n.ERR_13210_SYNTAX_INVALID, value ) ); |
| } |
| |
| return false; |
| } |
| } |