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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed 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
*
* http://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 com.android.gallery3d.exif;
import java.io.Closeable;
class Util {
public static boolean equals(Object a, Object b) {
return (a == b) || (a == null ? false : a.equals(b));
}
public static void closeSilently(Closeable c) {
if (c == null) return;
try {
c.close();
} catch (Throwable t) {
// do nothing
}
}
/**
* Tags that are not defined in the spec.
*/
static final short TAG_XP_TITLE = (short) 0x9c9b;
static final short TAG_XP_COMMENT = (short) 0x9c9c;
static final short TAG_XP_AUTHOR = (short) 0x9c9d;
static final short TAG_XP_KEYWORDS = (short) 0x9c9e;
static final short TAG_XP_SUBJECT = (short) 0x9c9f;
private static String tagUndefinedTypeValueToString(ExifTag tag) {
StringBuilder sbuilder = new StringBuilder();
byte[] buf = new byte[tag.getComponentCount()];
tag.getBytes(buf);
switch (tag.getTagId()) {
case ExifTag.TAG_COMPONENTS_CONFIGURATION:
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
if(i != 0) sbuilder.append(" ");
sbuilder.append(buf[i]);
}
break;
default:
if (buf.length == 1) {
sbuilder.append(buf[0]);
} else {
for (int i = 0, n = buf.length; i < n; i++) {
byte code = buf[i];
if (code == 0) continue;
if (code > 31 && code < 127) {
sbuilder.append((char) code);
} else {
sbuilder.append('.');
}
}
}
}
return sbuilder.toString();
}
/**
* Returns a string representation of the value of this tag.
*/
public static String tagValueToString(ExifTag tag) {
StringBuilder sbuilder = new StringBuilder();
short id = tag.getTagId();
switch (tag.getDataType()) {
case ExifTag.TYPE_UNDEFINED:
sbuilder.append(tagUndefinedTypeValueToString(tag));
break;
case ExifTag.TYPE_UNSIGNED_BYTE:
if (id == ExifTag.TAG_MAKER_NOTE || id == TAG_XP_TITLE ||
id == TAG_XP_COMMENT || id == TAG_XP_AUTHOR ||
id == TAG_XP_KEYWORDS || id == TAG_XP_SUBJECT) {
sbuilder.append(tagUndefinedTypeValueToString(tag));
} else {
byte[] buf = new byte[tag.getComponentCount()];
tag.getBytes(buf);
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
if(i != 0) sbuilder.append(" ");
sbuilder.append(buf[i]);
}
}
break;
case ExifTag.TYPE_ASCII:
byte[] buf = tag.getStringByte();
for (int i = 0, n = buf.length; i < n; i++) {
byte code = buf[i];
if (code == 0) {
// Treat some tag as undefined type data.
if (id == ExifTag.TAG_COPYRIGHT || id == ExifTag.TAG_GPS_DATE_STAMP) {
continue;
} else {
break;
}
}
if (code > 31 && code < 127) {
sbuilder.append((char) code);
} else {
sbuilder.append('.');
}
}
break;
case ExifTag.TYPE_UNSIGNED_LONG:
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
if(i != 0) sbuilder.append(" ");
sbuilder.append(tag.getValueAt(i));
}
break;
case ExifTag.TYPE_RATIONAL:
case ExifTag.TYPE_UNSIGNED_RATIONAL:
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
Rational r = tag.getRational(i);
if(i != 0) sbuilder.append(" ");
sbuilder.append(r.getNominator()).append("/").append(r.getDenominator());
}
break;
case ExifTag.TYPE_UNSIGNED_SHORT:
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
if(i != 0) sbuilder.append(" ");
sbuilder.append((int) tag.getValueAt(i));
}
break;
case ExifTag.TYPE_LONG:
for(int i = 0, n = tag.getComponentCount(); i < n; i++) {
if(i != 0) sbuilder.append(" ");
sbuilder.append((int) tag.getValueAt(i));
}
break;
}
return sbuilder.toString();
}
}
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