Java RandomAccessFile Read read_string(final RandomAccessFile raf)

Description

reastring

License

Open Source License

Declaration

public static String read_string(final RandomAccessFile raf) throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
* Copyright 2016 CNES - CENTRE NATIONAL d'ETUDES SPATIALES
*
* This file is part of JSave./*from w w w  .ja  va2 s  . c o  m*/
*
* JSave is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JSave is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with JSave.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

import java.io.IOException;
import java.io.RandomAccessFile;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

public class Main {
    public static String read_string(final RandomAccessFile raf) throws IOException {
        int length = read_long(raf);
        String result;
        if (length > 0) {
            byte[] data = new byte[length];
            raf.read(data);
            align_32(raf);
            result = new String(data, StandardCharsets.UTF_8);
        } else {
            result = "";
        }
        return result;
    }

    public static int read_long(final RandomAccessFile raf) throws IOException {
        byte[] data = new byte[4];
        raf.read(data);
        ByteBuffer bb = ByteBuffer.allocate(data.length);
        bb.put(data);
        return bb.getInt(0);
    }

    public static final void align_32(RandomAccessFile raf) throws IOException {
        long pos = raf.getFilePointer();
        if (pos % 4 != 0) {
            raf.seek(pos + 4 - pos % 4);
        }
    }
}

Related

1. LoadFloatFile(String filename)
2. LoadGhostMapFile(String filename, int n_ids, int n_ghosts)
3. read_arraydesc(final RandomAccessFile raf)
4. read_int32(RandomAccessFile raf)
5. read_long(final RandomAccessFile raf)
6. read_structdesc(final RandomAccessFile raf)
7. read_tagdesc(RandomAccessFile raf)
8. read_typedesc(final RandomAccessFile raf)
9. read_UnsignedByte(RandomAccessFile raf)