using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PFCRip
{
  public static class LittleEndianConverter
  {
    #region Public Methods

    public static string GetString(byte[] data, uint startIndex, uint length)
    {
      string ret = String.Empty;

      for (int i = 0; i < length; i++)
        ret += (char)data[startIndex + i];

      return ret;
    }

    public static string GetSafeString(byte[] data)
    {
      return GetSafeString(data, 0, (uint)data.Length);
    }

    public static string GetSafeString(byte[] data, uint startIndex, uint length)
    {
      string start = GetString(data, startIndex, length);
      string ret = String.Empty;

      for (int i = 0; i < start.Length; i++)
        if (start[i] >= 0x20 && start[i] < 0xF0)
          ret += start[i];

      return ret;
    }

    public static ushort ToUInt16(byte[] data)
    {
      return ToUInt16(data, 0);
    }

    public static ushort ToUInt16(byte[] data, uint startIndex)
    {
      ushort ret;

      ret = (ushort)(data[startIndex + 0] & 0x00FF);
      ret |= (ushort)((data[startIndex + 1] << 8) & 0xFF00);

      return ret;
    }

    public static uint ToUInt32(byte[] data)
    {
      return ToUInt32(data, 0);
    }

    public static uint ToUInt32(byte[] data, uint startIndex)
    {
      uint ret;

      ret = (uint)(data[startIndex + 0] & 0x000000FF);
      ret |= (uint)((data[startIndex + 1] << 8) & 0x0000FF00);
      ret |= (uint)((data[startIndex + 2] << 16) & 0x00FF0000);
      ret |= (uint)((data[startIndex + 3] << 24) & 0xFF000000);

      return ret;
    }

    #endregion
  }
}