isoparser/src/main/java/com/coremedia/iso/IsoTypeWriter.java

/*
 * Copyright 2012 Sebastian Annies, Hamburg
 *
 * 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.coremedia.iso;

import java.nio.ByteBuffer;

public final class IsoTypeWriter {

    public static void writeUInt64(ByteBuffer bb, long u) {
        bb.putLong(u);
    }

    public static void writeUInt32(ByteBuffer bb, long u) {
        bb.putInt((int) u);

    }

    public static void writeUInt32BE(ByteBuffer bb, long u) {
        assert u >= 0 && u <= 1L << 32 : "The given long is not in the range of uint32 (" + u + ")";
        writeUInt16BE(bb, (int) u & 0xFFFF);
        writeUInt16BE(bb, (int) ((u >> 16) & 0xFFFF));

    }


    public static void writeUInt24(ByteBuffer bb, int i) {
        i = i & 0xFFFFFF;
        writeUInt16(bb, i >> 8);
        writeUInt8(bb, i);

    }


    public static void writeUInt16(ByteBuffer bb, int i) {
        i = i & 0xFFFF;
        writeUInt8(bb, i >> 8);
        writeUInt8(bb, i & 0xFF);
    }

    public static void writeUInt16BE(ByteBuffer bb, int i) {
        i = i & 0xFFFF;
        writeUInt8(bb, i & 0xFF);
        writeUInt8(bb, i >> 8);
    }

    public static void writeUInt8(ByteBuffer bb, int i) {
        i = i & 0xFF;
        bb.put((byte) i);
    }


    public static void writeFixedPont1616(ByteBuffer bb, double v) {
        int result = (int) (v * 65536);
        bb.put((byte) ((result & 0xFF000000) >> 24));
        bb.put((byte) ((result & 0x00FF0000) >> 16));
        bb.put((byte) ((result & 0x0000FF00) >> 8));
        bb.put((byte) ((result & 0x000000FF)));
    }

    public static void writeFixedPont88(ByteBuffer bb, double v) {
        short result = (short) (v * 256);
        bb.put((byte) ((result & 0xFF00) >> 8));
        bb.put((byte) ((result & 0x00FF)));
    }

    public static void writeIso639(ByteBuffer bb, String language) {
        if (language.getBytes().length != 3) {
            throw new IllegalArgumentException("\"" + language + "\" language string isn't exactly 3 characters long!");
        }
        int bits = 0;
        for (int i = 0; i < 3; i++) {
            bits += (language.getBytes()[i] - 0x60) << (2 - i) * 5;
        }
        writeUInt16(bb, bits);
    }

    public static void writeUtf8String(ByteBuffer bb, String string) {

        bb.put(Utf8.convert(string));
        writeUInt8(bb, 0);
    }
}