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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.storage.io.read;
import com.android.timezone.location.storage.block.read.BlockData;
import java.io.BufferedInputStream;
import java.io.Closeable;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A typed stream-based typed data accessor.
*
* See {@link BlockData} for a random-access equivalent.
*/
public final class TypedInputStream implements Closeable {
private final DataInputStream dis;
/** Wraps an InputStream. */
public TypedInputStream(InputStream is) {
dis = new DataInputStream(new BufferedInputStream(is, 8192));
}
/** Skip forward the specified number of bytes. */
public int skipBytes(int n) throws IOException {
return dis.skipBytes(n);
}
/** Reads the next byte as an unsigned value. */
public int readUnsignedByte() throws IOException {
return dis.readByte() & 0xFF;
}
/** Reads the next byte as a signed value. */
public byte readSignedByte() throws IOException {
return dis.readByte();
}
/**
* Reads a tiny (<= 255 entries) array of signed bytes where the length is encoded in the
* data.
*/
public byte[] readTinyVarByteArray() throws IOException {
int arraySize = readUnsignedByte();
byte[] bytes = new byte[arraySize];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) dis.readUnsignedByte();
}
return bytes;
}
/**
* Reads a tiny (<= 255 entries) array of chars where the length is encoded in the data.
*/
public char[] readTinyVarCharArray() throws IOException {
int arraySize = readUnsignedByte();
char[] chars = new char[arraySize];
for (int i = 0; i < chars.length; i++) {
chars[i] = dis.readChar();
}
return chars;
}
/**
* Reads a char in network byte order.
*/
public char readChar() throws IOException {
return dis.readChar();
}
/**
* Reads a signed int in network byte order.
*/
public int readInt() throws IOException {
return dis.readInt();
}
/**
* Reads a signed long in network byte order.
*/
public long readLong() throws IOException {
return dis.readLong();
}
@Override
public void close() throws IOException {
dis.close();
}
}
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