public uint Reserve(long offset, uint size)
{
if (offset < m_offset || offset + size > m_offset + m_size)
{
if (offset > m_arc.MaxOffset)
{
throw new ArgumentOutOfRangeException("offset", "Too large offset specified for memory mapped file view.");
}
if (size < ArcView.PageSize)
{
size = (uint)ArcView.PageSize;
}
if (size > m_arc.MaxOffset - offset)
{
size = (uint)(m_arc.MaxOffset - offset);
}
var old_view = m_view;
m_view = m_arc.CreateViewAccessor(offset, size);
old_view.SafeMemoryMappedViewHandle.ReleasePointer();
old_view.Dispose();
m_offset = offset;
m_size = size;
unsafe { m_mem = m_view.GetPointer(m_offset); }
}
return((uint)(m_offset + m_size - offset));
}
public Frame(ArcView arc, long offset, uint size)
{
m_arc = arc;
m_offset = Math.Min(offset, m_arc.MaxOffset);
m_size = (uint)Math.Min(size, m_arc.MaxOffset - m_offset);
m_view = m_arc.CreateViewAccessor(m_offset, m_size);
unsafe { m_mem = m_view.GetPointer(m_offset); }
}
public Frame(Frame other)
{
m_arc = other.m_arc;
m_offset = 0;
m_size = (uint)Math.Min(ArcView.PageSize, m_arc.MaxOffset);
m_view = m_arc.CreateViewAccessor(m_offset, m_size);
unsafe { m_mem = m_view.GetPointer(m_offset); }
}
public Frame(ArcView arc)
{
m_arc = arc;
m_offset = 0;
m_size = (uint)Math.Min(ArcView.PageSize, m_arc.MaxOffset);
m_view = m_arc.CreateViewAccessor(m_offset, m_size);
unsafe { m_mem = m_view.GetPointer(m_offset); } //unsafe permet d'utiliser des pointeurs
}
public bool AsciiEqual(long offset, string data)
{
if (Reserve(offset, (uint)data.Length) < (uint)data.Length)
{
return(false);
}
unsafe
{
byte *ptr = m_view.GetPointer(m_offset);
try {
for (int i = 0; i < data.Length; ++i)
{
if (ptr[offset - m_offset + i] != data[i])
{
return(false);
}
}
} finally {
m_view.SafeMemoryMappedViewHandle.ReleasePointer();
}
return(true);
}
}
public ViewPointer(MemoryMappedViewAccessor view, long offset)
{
m_view = view;
m_ptr = m_view.GetPointer(offset);
}