package org.jcodec.common;

import java.nio.ByteBuffer;
import org.jcodec.common.tools.MathUtil;
import org.jcodec.platform.Platform;

public class JCodecUtil2 {
  public static void writeBER32(ByteBuffer buffer, int value) {
    buffer.put((byte)(value >> 21 | 0x80));
    buffer.put((byte)(value >> 14 | 0x80));
    buffer.put((byte)(value >> 7 | 0x80));
    buffer.put((byte)(value & 0x7F));
  }
  
  public static int readBER32(ByteBuffer input) {
    int size = 0;
    for (int i = 0; i < 4; i++) {
      byte b = input.get();
      size = size << 7 | b & Byte.MAX_VALUE;
      if ((b & 0xFF) >> 7 == 0)
        break; 
    } 
    return size;
  }
  
  public static void writeBER32Var(ByteBuffer bb, int value) {
    for (int i = 0, bits = MathUtil.log2(value); i < 4 && bits > 0; i++) {
      bits -= 7;
      int out = value >> bits;
      if (bits > 0)
        out |= 0x80; 
      bb.put((byte)out);
    } 
  }
  
  public static byte[] asciiString(String fourcc) {
    return Platform.getBytes(fourcc);
  }
  
  public static int[] getAsIntArray(ByteBuffer yuv, int size) {
    byte[] b = new byte[size];
    int[] result = new int[size];
    yuv.get(b);
    for (int i = 0; i < b.length; i++)
      result[i] = b[i] & 0xFF; 
    return result;
  }
  
  public static String removeExtension(String name) {
    if (name == null)
      return null; 
    return name.replaceAll("\\.[^\\.]+$", "");
  }
}