Added wxStream but I haven't tested them.

Modified wxDataStream.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@234 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/mstream.cpp

@@ -0,0 +1,133 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        mmstream.cpp
+// Purpose:     "Memory stream" classes
+// Author:      Guilhem Lavaux
+// Modified by:
+// Created:     04/01/98
+// RCS-ID:      $Id$
+// Copyright:   (c) Guilhem Lavaux
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+#ifdef __GNUG__
+#pragma implementation "mmstream.h"
+#endif
+
+#include <stdlib.h>
+#include <wx/stream.h>
+#include <wx/mmstream.h>
+
+wxMemoryStreamBase::wxMemoryStreamBase(char *data, size_t length, int iolimit)
+{
+  m_buffer = data;
+  m_iolimit = iolimit;
+  m_persistent = FALSE;
+  m_length = length;
+  m_position_i = m_position_o = 0;
+}
+
+wxMemoryStreamBase::~wxMemoryStreamBase()
+{
+  free(m_buffer);
+}
+
+wxInputStream& wxMemoryStreamBase::Read(void *buffer, size_t size)
+{
+  if (m_iolimit == 2) {
+    m_eof = TRUE;
+    return *this;
+  }
+  if (m_position_i+size > m_length)
+    size = m_length-m_position_i;
+
+  memcpy((void *)((unsigned long)buffer+m_position_i), m_buffer, size);
+  m_position_i += size;
+  m_lastread = size;
+
+  return *this;
+}
+
+size_t wxMemoryStreamBase::SeekI(int pos, wxWhenceType whence)
+{
+  if (m_iolimit == 2)
+    return 0;
+
+  switch (whence) {
+  case wxBeginPosition:
+    if ((size_t)pos > m_length)
+      return m_position_i;
+    return (m_position_i = pos);
+
+  case wxCurrentPosition:
+    if ((size_t)(m_position_i+pos) > m_length)
+      return m_position_i;
+
+    return (m_position_i += pos);
+
+  case wxEndPosition:
+    if ((size_t)(m_length-pos) > m_length)
+      return m_position_i;
+
+    return (m_position_i = m_length-pos);
+  }
+
+  return m_position_i;
+}
+
+wxOutputStream& wxMemoryStreamBase::Write(const void *buffer, size_t size)
+{
+  if (m_iolimit == 1) {
+    m_bad = TRUE;
+    return *this;
+  }
+  
+  if (m_position_o+size > m_length)
+    if (!ChangeBufferSize(m_position_o+size)) {
+      m_bad = TRUE;
+      return *this;
+    }
+
+  memcpy(m_buffer+m_position_o, buffer, size);
+  m_position_o += size;
+  m_lastwrite = size;
+
+  return *this;
+}
+
+size_t wxMemoryStreamBase::SeekO(int pos, wxWhenceType whence)
+{
+  if (m_iolimit == 2)
+    return 0;
+
+  switch (whence) {
+  case wxBeginPosition:
+    if ((size_t)pos > m_length)
+      return m_position_o;
+    return (m_position_o = pos);
+
+  case wxCurrentPosition:
+    if ((size_t)(m_position_o+pos) > m_length)
+      return m_position_o;
+
+    return (m_position_o += pos);
+
+  case wxEndPosition:
+    if ((size_t)(m_length-pos) > m_length)
+      return m_position_o;
+
+    return (m_position_o = m_length-pos);
+  }
+
+  return m_position_o;
+}
+
+bool wxMemoryStreamBase::ChangeBufferSize(size_t new_size)
+{
+  m_length = new_size;
+  if (!m_buffer)
+    m_buffer = (char *)malloc(m_length);
+  else
+    m_buffer = (char *)realloc(m_buffer, m_length);
+
+  return (m_buffer != NULL);
+}