=============================
LGPL licensed 7zip, UdfIn.cpp
=============================

      HRESULT CInArchive::ReadFromFile(int volIndex, const CItem &item, CByteBuffer &buf)
      {
        if (item.Size >= (UInt32)1 << 30)
          return S_FALSE;
        if (item.IsInline)
        {
          buf = item.InlineData;
          return S_OK;
        }
        buf.SetCapacity((size_t)item.Size);
        size_t pos = 0;
        for (int i = 0; i < item.Extents.Size(); i++)
        {
          const CMyExtent &e = item.Extents[i];
          UInt32 len = e.GetLen();
          RINOK(Read(volIndex, e.PartitionRef, e.Pos, len, (Byte *)buf + pos));
          pos += len;
        }
        return S_OK;
      }
      
======================================================
GPL licensed derivative work ImageMaster, UdfReader.cs
======================================================

      private bool ReadFromFile(int volumeIndex, ref UdfRecord item, ref byte[] buffer)
      {
          if (item.Size >= MaxExtents)
              return false;
          if (item.IsInline)
          {
              buffer = item.InlineData;
              return true;
          }

          buffer = new byte[item.Size];
          int position = 0;
          for (int i = 0; i < item.Extents.Count; i++)
          {
              FileExtent e = item.Extents[i];
              int length = e.Length;
              byte[] b = UdfHelper.Readbytes(position, buffer, buffer.Length);
              Read(volumeIndex, e.PartitionReference, e.Position, length, b);
              position += length;
          }
          return true;
      }

==================================================
Microsoft licensed ISO tool, reflected source code
==================================================

      private bool ReadFromFile(int volumeIndex, ref UdfRecord item, ref byte[] buffer)
      {
          if (item.Size >= 1073741824L)
          {
              return false;
          }
          if (item.IsInline)
          {
              buffer = item.InlineData;
              return true;
          }
          buffer = new byte[item.Size];
          int start = 0;
          for (int i = 0; i < item.Extents.Count; i++)
          {
              FileExtent extent = item.Extents[i];
              int length = extent.Length;
              byte[] buffer2 = UdfHelper.Readbytes(start, buffer, buffer.Length);
              if (!this.ReadData(volumeIndex, extent.PartitionReference, extent.Position, length, buffer2))
              {
                  return false;
              }
              start += length;
          }
          return true;
      }