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/*
* Copyright (C) 2021 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 android.graphics.fonts;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.FileChannel;
import java.nio.charset.StandardCharsets;
public class FontFileTestUtil {
private static final int SFNT_VERSION_1 = 0x00010000;
private static final int SFNT_VERSION_OTTO = 0x4F54544F;
private static final int TTC_TAG = 0x74746366;
private static final int NAME_TAG = 0x6E616D65;
private static final int META_TAG = 0x6D657461;
private static final int EMJI_TAG = 0x456D6A69;
public static String getPostScriptName(File file) throws IOException {
try (FileInputStream fis = new FileInputStream(file)) {
final FileChannel fc = fis.getChannel();
long size = fc.size();
ByteBuffer buffer = fc.map(FileChannel.MapMode.READ_ONLY, 0, size)
.order(ByteOrder.BIG_ENDIAN);
int magicNumber = buffer.getInt(0);
int fontOffset = 0;
if (magicNumber == TTC_TAG) {
fontOffset = buffer.getInt(12); // 0th offset
magicNumber = buffer.getInt(fontOffset);
if (magicNumber != SFNT_VERSION_1 && magicNumber != SFNT_VERSION_OTTO) {
throw new IOException("Unknown magic number at 0th font: #" + magicNumber);
}
} else if (magicNumber != SFNT_VERSION_1 && magicNumber != SFNT_VERSION_OTTO) {
throw new IOException("Unknown magic number: #" + magicNumber);
}
int numTables = buffer.getShort(fontOffset + 4); // offset to number of table
int nameTableOffset = 0;
for (int i = 0; i < numTables; ++i) {
int tableEntryOffset = fontOffset + 12 + i * 16;
int tableTag = buffer.getInt(tableEntryOffset);
if (tableTag == NAME_TAG) {
nameTableOffset = buffer.getInt(tableEntryOffset + 8);
break;
}
}
if (nameTableOffset == 0) {
throw new IOException("name table not found.");
}
int nameTableCount = buffer.getShort(nameTableOffset + 2);
int storageOffset = buffer.getShort(nameTableOffset + 4);
for (int i = 0; i < nameTableCount; ++i) {
int platformID = buffer.getShort(nameTableOffset + 6 + i * 12);
int encodingID = buffer.getShort(nameTableOffset + 6 + i * 12 + 2);
int languageID = buffer.getShort(nameTableOffset + 6 + i * 12 + 4);
int nameID = buffer.getShort(nameTableOffset + 6 + i * 12 + 6);
int length = buffer.getShort(nameTableOffset + 6 + i * 12 + 8);
int stringOffset = buffer.getShort(nameTableOffset + 6 + i * 12 + 10);
if (nameID == 6 && platformID == 3 && encodingID == 1 && languageID == 1033) {
byte[] name = new byte[length];
ByteBuffer slice = buffer.slice();
slice.position(nameTableOffset + storageOffset + stringOffset);
slice.get(name);
// encoded in UTF-16BE for platform ID = 3
return new String(name, StandardCharsets.UTF_16BE);
}
}
}
return null;
}
}
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