/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009 Sun Microsystems, Inc.
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* Portions Copyright 2012 ForgeRock AS
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*/
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package org.forgerock.opendj.ldap.schema;
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import static org.forgerock.opendj.ldap.schema.SchemaConstants.EMR_OCTET_STRING_OID;
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import static org.forgerock.opendj.ldap.schema.SchemaConstants.OMR_OCTET_STRING_OID;
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import static org.forgerock.opendj.ldap.schema.SchemaConstants.SYNTAX_JPEG_NAME;
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import org.forgerock.i18n.LocalizableMessageBuilder;
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import org.forgerock.opendj.ldap.ByteSequence;
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/**
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* This class implements the JPEG attribute syntax. This is actually
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* two specifications - JPEG and JFIF. As an extension we allow JPEG
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* and Exif, which is what most digital cameras use. We only check for
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* valid JFIF and Exif headers.
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*/
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final class JPEGSyntaxImpl extends AbstractSyntaxImpl {
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@Override
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public String getEqualityMatchingRule() {
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return EMR_OCTET_STRING_OID;
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}
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public String getName() {
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return SYNTAX_JPEG_NAME;
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}
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@Override
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public String getOrderingMatchingRule() {
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return OMR_OCTET_STRING_OID;
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}
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public boolean isHumanReadable() {
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return false;
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}
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/**
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* Indicates whether the provided value is acceptable for use in an
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* attribute with this syntax. If it is not, then the reason may be appended
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* to the provided buffer.
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*
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* @param schema
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* The schema in which this syntax is defined.
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* @param value
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* The value for which to make the determination.
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* @param invalidReason
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* The buffer to which the invalid reason should be appended.
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* @return <CODE>true</CODE> if the provided value is acceptable for use
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* with this syntax, or <CODE>false</CODE> if not.
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*/
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public boolean valueIsAcceptable(final Schema schema, final ByteSequence value,
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final LocalizableMessageBuilder invalidReason) {
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if (!schema.allowMalformedJPEGPhotos()) {
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/* JFIF files start:
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* 0xff 0xd8 0xff 0xe0 LH LL 0x4a 0x46 0x49 0x46 ...
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* SOI APP0 len "JFIF"
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*
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* Exif files (from most digital cameras) start:
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* 0xff 0xd8 0xff 0xe1 LH LL 0x45 0x78 0x69 0x66 ...
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* SOI APP1 len "Exif"
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*
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* So all legal values must be at least 10 bytes long
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*/
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if (value.length() < 10) {
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return false;
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}
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if (value.byteAt(0) != (byte) 0xff && value.byteAt(1) != (byte) 0xd8) {
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return false;
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}
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if (value.byteAt(2) == (byte) 0xff && value.byteAt(3) == (byte) 0xe0
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&& value.byteAt(6) == 'J' && value.byteAt(7) == 'F'
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&& value.byteAt(8) == 'I' && value.byteAt(9) == 'F') {
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return true;
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}
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if (value.byteAt(2) == (byte) 0xff && value.byteAt(3) == (byte) 0xe1
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&& value.byteAt(6) == 'E' && value.byteAt(7) == 'x'
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&& value.byteAt(8) == 'i' && value.byteAt(9) == 'f') {
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return true;
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}
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// No JFIF or Exif header found
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return false;
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}
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return true;
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}
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}
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