com.drew.metadata.photoshop.PhotoshopDescriptor Maven / Gradle / Ivy
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Java library for extracting EXIF, IPTC, XMP, ICC and other metadata from image and video files.
/*
* Copyright 2002-2017 Drew Noakes
*
* 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.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.photoshop;
import com.drew.lang.ByteArrayReader;
import com.drew.lang.RandomAccessReader;
import com.drew.lang.annotations.NotNull;
import com.drew.lang.annotations.Nullable;
import com.drew.metadata.TagDescriptor;
import java.io.IOException;
import java.text.DecimalFormat;
import static com.drew.metadata.photoshop.PhotoshopDirectory.*;
/**
* @author Yuri Binev
* @author Drew Noakes https://drewnoakes.com
*/
@SuppressWarnings("WeakerAccess")
public class PhotoshopDescriptor extends TagDescriptor
{
public PhotoshopDescriptor(@NotNull PhotoshopDirectory directory)
{
super(directory);
}
@Override
public String getDescription(int tagType)
{
switch (tagType) {
case TAG_THUMBNAIL:
case TAG_THUMBNAIL_OLD:
return getThumbnailDescription(tagType);
case TAG_URL:
case TAG_XML:
return getSimpleString(tagType);
case TAG_IPTC:
return getBinaryDataString(tagType);
case TAG_SLICES:
return getSlicesDescription();
case TAG_VERSION:
return getVersionDescription();
case TAG_COPYRIGHT:
return getBooleanString(tagType);
case TAG_RESOLUTION_INFO:
return getResolutionInfoDescription();
case TAG_GLOBAL_ANGLE:
case TAG_GLOBAL_ALTITUDE:
case TAG_URL_LIST:
case TAG_SEED_NUMBER:
return get32BitNumberString(tagType);
case TAG_JPEG_QUALITY:
return getJpegQualityString();
case TAG_PRINT_SCALE:
return getPrintScaleDescription();
case TAG_PIXEL_ASPECT_RATIO:
return getPixelAspectRatioString();
default:
return super.getDescription(tagType);
}
}
@Nullable
public String getJpegQualityString()
{
try {
byte[] b = _directory.getByteArray(TAG_JPEG_QUALITY);
if (b == null)
return _directory.getString(TAG_JPEG_QUALITY);
RandomAccessReader reader = new ByteArrayReader(b);
int q = reader.getUInt16(0); // & 0xFFFF;
int f = reader.getUInt16(2); // & 0xFFFF;
int s = reader.getUInt16(4);
int q1 = q <= 0xFFFF && q >= 0xFFFD
? q - 0xFFFC
: q <= 8
? q + 4
: q;
String quality;
switch (q) {
case 0xFFFD:
case 0xFFFE:
case 0xFFFF:
case 0:
quality = "Low";
break;
case 1:
case 2:
case 3:
quality = "Medium";
break;
case 4:
case 5:
quality = "High";
break;
case 6:
case 7:
case 8:
quality = "Maximum";
break;
default:
quality = "Unknown";
}
String format;
switch (f) {
case 0x0000:
format = "Standard";
break;
case 0x0001:
format = "Optimised";
break;
case 0x0101:
format = "Progressive";
break;
default:
format = String.format("Unknown 0x%04X", f);
}
String scans = s >= 1 && s <= 3
? String.format("%d", s + 2)
: String.format("Unknown 0x%04X", s);
return String.format("%d (%s), %s format, %s scans", q1, quality, format, scans);
} catch (IOException e) {
return null;
}
}
@Nullable
public String getPixelAspectRatioString()
{
try {
byte[] bytes = _directory.getByteArray(TAG_PIXEL_ASPECT_RATIO);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
double d = reader.getDouble64(4);
return Double.toString(d);
} catch (Exception e) {
return null;
}
}
@Nullable
public String getPrintScaleDescription()
{
try {
byte bytes[] = _directory.getByteArray(TAG_PRINT_SCALE);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
int style = reader.getInt32(0);
float locX = reader.getFloat32(2);
float locY = reader.getFloat32(6);
float scale = reader.getFloat32(10);
switch (style) {
case 0:
return "Centered, Scale " + scale;
case 1:
return "Size to fit";
case 2:
return String.format("User defined, X:%s Y:%s, Scale:%s", locX, locY, scale);
default:
return String.format("Unknown %04X, X:%s Y:%s, Scale:%s", style, locX, locY, scale);
}
} catch (Exception e) {
return null;
}
}
@Nullable
public String getResolutionInfoDescription()
{
try {
byte[] bytes = _directory.getByteArray(TAG_RESOLUTION_INFO);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
float resX = reader.getS15Fixed16(0);
float resY = reader.getS15Fixed16(8); // is this the correct offset? it's only reading 4 bytes each time
DecimalFormat format = new DecimalFormat("0.##");
return format.format(resX) + "x" + format.format(resY) + " DPI";
} catch (Exception e) {
return null;
}
}
@Nullable
public String getVersionDescription()
{
try {
final byte[] bytes = _directory.getByteArray(TAG_VERSION);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
int pos = 0;
int ver = reader.getInt32(0);
pos += 4;
pos++;
int readerLength = reader.getInt32(5);
pos += 4;
String readerStr = reader.getString(9, readerLength * 2, "UTF-16");
pos += readerLength * 2;
int writerLength = reader.getInt32(pos);
pos += 4;
String writerStr = reader.getString(pos, writerLength * 2, "UTF-16");
pos += writerLength * 2;
int fileVersion = reader.getInt32(pos);
return String.format("%d (%s, %s) %d", ver, readerStr, writerStr, fileVersion);
} catch (IOException e) {
return null;
}
}
@Nullable
public String getSlicesDescription()
{
try {
final byte bytes[] = _directory.getByteArray(TAG_SLICES);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
int nameLength = reader.getInt32(20);
String name = reader.getString(24, nameLength * 2, "UTF-16");
int pos = 24 + nameLength * 2;
int sliceCount = reader.getInt32(pos);
return String.format("%s (%d,%d,%d,%d) %d Slices",
name, reader.getInt32(4), reader.getInt32(8), reader.getInt32(12), reader.getInt32(16), sliceCount);
} catch (IOException e) {
return null;
}
}
@Nullable
public String getThumbnailDescription(int tagType)
{
try {
byte[] v = _directory.getByteArray(tagType);
if (v == null)
return null;
RandomAccessReader reader = new ByteArrayReader(v);
int format = reader.getInt32(0);
int width = reader.getInt32(4);
int height = reader.getInt32(8);
//skip WidthBytes
int totalSize = reader.getInt32(16);
int compSize = reader.getInt32(20);
int bpp = reader.getInt32(24);
//skip Number of planes
return String.format("%s, %dx%d, Decomp %d bytes, %d bpp, %d bytes",
format == 1 ? "JpegRGB" : "RawRGB",
width, height, totalSize, bpp, compSize);
} catch (IOException e) {
return null;
}
}
@Nullable
private String getBooleanString(int tag)
{
final byte[] bytes = _directory.getByteArray(tag);
if (bytes == null || bytes.length == 0)
return null;
return bytes[0] == 0 ? "No" : "Yes";
}
@Nullable
private String get32BitNumberString(int tag)
{
byte[] bytes = _directory.getByteArray(tag);
if (bytes == null)
return null;
RandomAccessReader reader = new ByteArrayReader(bytes);
try {
return String.format("%d", reader.getInt32(0));
} catch (IOException e) {
return null;
}
}
@Nullable
private String getSimpleString(int tagType)
{
final byte[] bytes = _directory.getByteArray(tagType);
if (bytes == null)
return null;
return new String(bytes);
}
@Nullable
private String getBinaryDataString(int tagType)
{
final byte[] bytes = _directory.getByteArray(tagType);
if (bytes == null)
return null;
return String.format("%d bytes binary data", bytes.length);
}
}