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/*
* Copyright (C) 2020 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.timezone.location.tools.dump;
import com.android.timezone.location.storage.util.Visitor;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
/** Helper methods for dumping data to files. */
public final class DumpUtils {
private DumpUtils() {
}
public static PrintWriter createPrintWriter(File file) throws Visitor.VisitException {
try {
OutputStreamWriter utf8Writer = new OutputStreamWriter(
new FileOutputStream(file), StandardCharsets.UTF_8);
return new PrintWriter(utf8Writer);
} catch (IOException e) {
throw new Visitor.VisitException(e);
}
}
public static File generateDumpFile(File dir, String filePrefix, int blockId, int maxBlockId) {
final String fileSuffix = ".txt";
int blockIdLength = hexStringLength(maxBlockId);
StringBuilder sb = new StringBuilder(
filePrefix.length() + blockIdLength + fileSuffix.length());
sb.append(filePrefix);
String blockIdHex = zeroPadHex(blockIdLength, blockId);
sb.append(blockIdHex);
sb.append(fileSuffix);
return new File(dir, sb.toString());
}
public static int hexStringLength(int value) {
int bitsNeeded = Integer.SIZE - Integer.numberOfLeadingZeros(value);
return (bitsNeeded + 3) / 4;
}
public static int binaryStringLength(int value) {
return Integer.SIZE - Integer.numberOfLeadingZeros(value);
}
public static String zeroPadHex(int length, int value) {
String hexString = Integer.toHexString(value);
int unpaddedLength = hexString.length();
if (unpaddedLength >= length) {
return hexString;
}
return zeroPad(length, hexString);
}
public static String zeroPadBinary(int length, int value) {
String binaryString = Integer.toBinaryString(value);
int unpaddedLength = binaryString.length();
if (unpaddedLength >= length) {
return binaryString;
}
return zeroPad(length, binaryString);
}
private static String zeroPad(int length, String unpaddedValue) {
StringBuilder sb = new StringBuilder(length);
int zeroPadding = length - unpaddedValue.length();
for (int i = 0; i < zeroPadding; i++) {
sb.append('0');
}
sb.append(unpaddedValue);
return sb.toString();
}
}
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