elfsharp > ReadUInt32()の構造

unsigned int32を読み込む処理 ReadUInt32() の追跡

public uint ReadUInt32()
{
  ReadInternal(buffer, 4);
  return bitConverter.ToUInt32(buffer, 0);
}

public uint ToUInt32 (byte[] value, int startIndex)
{
  return unchecked((uint) (CheckedFromBytes(value, startIndex, 4)));
}

long CheckedFromBytes(byte[] value, int startIndex, int bytesToConvert)
{
  CheckByteArgument(value, startIndex, bytesToConvert);
  return FromBytes(value, startIndex, bytesToConvert);
}

CheckByteArgument()は例外処理。

/// <summary>
/// Convert the given number of bytes from the given array, from the given start
/// position, into a long, using the bytes as the least significant part of the long.
/// By the time this is called, the arguments have been checked for validity.
/// </summary>
/// <param name="value">The bytes to convert</param>
/// <param name="startIndex">The index of the first byte to convert</param>
/// <param name="bytesToConvert">The number of bytes to use in the conversion</param>
/// <returns>The converted number</returns>
protected abstract long FromBytes(byte[] value, int startIndex, int bytesToConvert);
#endregion

protected override long FromBytes(byte[] buffer, int startIndex, int bytesToConvert)
{
  long ret = 0;
  for (int i=0; i < bytesToConvert; i++)
  {
    ret = unchecked((ret << 8) | buffer[startIndex+bytesToConvert-1-i]);
  }
  return ret;
}