com.swiftmq.tools.util.DataStreamInputStream Maven / Gradle / Ivy

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/*
 * Copyright 2019 IIT Software GmbH
 *
 * IIT Software GmbH licenses this file to You 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.swiftmq.tools.util;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

public class DataStreamInputStream extends InputStream implements LengthCaptureDataInput {
    InputStream in = null;
    long captureLength = 0;

    public DataStreamInputStream(InputStream in) {
        this.in = in;
    }

    public DataStreamInputStream() {
    }

    public void startCaptureLength() {
        captureLength = 0;
    }

    public long stopCaptureLength() {
        return captureLength;
    }

    public void setInputStream(InputStream in) {
        this.in = in;
    }

    public int available() throws IOException {
        return in.available();
    }

    public int read() throws IOException {
        captureLength++;
        return in.read();
    }

    public void readFully(byte b[]) throws IOException {
        readFully(b, 0, b.length);
    }

    public void readFully(byte b[], int off, int len) throws IOException {
        int n = 0;
        while (n < len) {
            int count = in.read(b, off + n, len - n);
            if (count < 0)
                throw new EOFException();
            n += count;
        }
        captureLength += len;
    }

    public int skipBytes(int n) throws IOException {
        int total = 0;
        int cur;

        while ((total < n) && ((cur = (int) in.skip(n - total)) > 0)) {
            total += cur;
        }
        captureLength += total;

        return total;
    }

    public boolean readBoolean() throws IOException {
        int ch = read();
        if (ch < 0)
            throw new EOFException();
        return (ch != 0);
    }

    public byte readByte() throws IOException {
        int ch = read();
        if (ch < 0)
            throw new EOFException();
        return (byte) (ch);
    }

    public int readUnsignedByte() throws IOException {
        int ch = read();
        if (ch < 0)
            throw new EOFException();
        return ch;
    }

    public short readShort() throws IOException {
        int ch1 = read();
        int ch2 = read();
        if ((ch1 | ch2) < 0)
            throw new EOFException();
        return (short) ((ch1 << 8) + (ch2));
    }

    public int readUnsignedShort() throws IOException {
        int ch1 = read();
        int ch2 = read();
        if ((ch1 | ch2) < 0)
            throw new EOFException();
        return (ch1 << 8) + (ch2);
    }

    public char readChar() throws IOException {
        int ch1 = read();
        int ch2 = read();
        if ((ch1 | ch2) < 0)
            throw new EOFException();
        return (char) ((ch1 << 8) + (ch2));
    }

    public int readInt() throws IOException {
        int ch1 = read();
        int ch2 = read();
        int ch3 = read();
        int ch4 = read();
        if ((ch1 | ch2 | ch3 | ch4) < 0)
            throw new EOFException();
        return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4));
    }

    public long readLong() throws IOException {
        return ((long) (readInt()) << 32) + (readInt() & 0xFFFFFFFFL);
    }

    public float readFloat() throws IOException {
        return Float.intBitsToFloat(readInt());
    }

    public double readDouble() throws IOException {
        return Double.longBitsToDouble(readLong());
    }

    public String readLine() throws IOException {
        return null;
    }

    public String readUTF() throws IOException {
        return UTFUtils.decodeUTF(readUnsignedShort(), this);
    }

}