18 files changed, 651 insertions, 175 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e3cf8685c..6bc05345ed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,7 @@ list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
 # Set the version information here
 set(VERSION_INFO_MAJOR_VERSION 3)
 set(VERSION_INFO_API_COMPAT    6)
-set(VERSION_INFO_MINOR_VERSION 2)
+set(VERSION_INFO_MINOR_VERSION 3)
 set(VERSION_INFO_MAINT_VERSION git)
 include(GrVersion) #setup version info
 
diff --git a/docs/doxygen/other/build_guide.dox b/docs/doxygen/other/build_guide.dox
deleted file mode 100644
index 629a0f89f2..0000000000
--- a/docs/doxygen/other/build_guide.dox
+++ /dev/null
@@ -1,158 +0,0 @@
-/*! \page page_build Build Instructions and Information
-
-\section dependencies Dependencies
-
-The list of GNU Radio dependencies and the minimum required versions,
-if any, to build the various GNU Radio components.
-
-Most of these components do not need to be individually compiled or
-installed. Instead, rely on your operating system's package manager or
-binary installation process (the <b>apt-get</b> system in Debian and
-Ubuntu, <b>yum</b> in RedHat and Fedora, etc.). GNU Radio tries to keep an
-up-to-date build guide for the majority of the supported operating
-systems on gnuradio.org
-(http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide).
-
-Not all dependencies are required for all components, and not all
-components are required for a given installation. The list of required
-components is determined by what the user requires from GNU Radio. If,
-for example, you do not use any Comedi-based hardware, do not worry
-about building gr-comedi.
-
-Before trying to build these from source, please try your system's
-installation tool (apt-get, pkg_install, YaST, yum, urpmi, etc.)
-first. Most recent systems have these packages available.
-
-\subsection dep_global Global Dependencies
-\li git                      http://code.google.com/p/msysgit
-\li cmake       (>= 2.6)     http://www.cmake.org/cmake/resources/software.html
-\li boost       (>= 1.35)    http://www.boostpro.com/download
-\li cppunit     (>= 1.9.14)  http://gaiacrtn.free.fr/cppunit/index.html
-\li fftw3f      (>= 3.0)     http://www.fftw.org/install/windows.html
-
-\subsection dep_python Python Wrappers
-\li python      (>= 2.5)     http://www.python.org/download/
-\li swig        (>= 1.3.31)  http://www.swig.org/download.html
-\li numpy       (>= 1.1.0)   http://sourceforge.net/projects/numpy/files/NumPy/
-
-\subsection dep_docs docs: Building the documentation
-\li doxygen     (>= 1.5)     http://www.stack.nl/~dimitri/doxygen/download.html
-
-\subsection dep_grc grc: The GNU Radio Companion
-\li Cheetah     (>= 2.0)     http://www.cheetahtemplate.org/
-\li pygtk       (>= 2.10)    http://www.pygtk.org/downloads.html
-
-\subsection dep_wavelet gr-wavelet: Collection of wavelet blocks
-\li gsl	        (>= 1.10)    http://gnuwin32.sourceforge.net/packages/gsl.htm
-
-\subsection dep_gr_qtgui gr-qtgui: The QT-based Graphical User Interface
-\li qt	        (>= 4.4)     http://qt.nokia.com/downloads/
-\li qwt         (>= 5.2)     http://sourceforge.net/projects/qwt/
-\li pyqt        (>= 4.4)     http://www.riverbankcomputing.co.uk/software/pyqt/download
-\li pyqwt       (>= 5.2)     http://pyqwt.sourceforge.net/download.html
-
-\subsection dep_gr_wxgui gr-wxgui: The WX-based Graphical User Interface
-\li wxpython    (>= 2.8)     http://www.wxpython.org/
-\li python-lxml (>= 1.3.6)   http://lxml.de/
-
-\subsection dep_gr_audio gr-audio: Audio Subsystems (system/OS dependent)
-\li audio-alsa  (>= 0.9)     http://www.alsa-project.org
-\li audio-jack  (>= 0.8)     http://jackaudio.org/
-\li portaduio   (>= 19)      http://www.portaudio.com/
-\li audio-oss   (>= 1.0)     http://www.opensound.com/oss.html
-\li audio-osx
-\li audio-windows
-
-It is not necessary to satisfy all of these dependencies; just the
-one(s) that are right for your system. On Linux, don't expect
-audio-osx and audio-windows to be either satisfied or built.
-
-\subsection dep_uhd uhd: The Ettus USRP Hardware Driver Interface
-\li uhd         (>= 3.0.0)   http://code.ettus.com/redmine/ettus/projects/uhd/wiki
-
-\subsection dep_shd shd: The Symplex Hardware Driver Interface
-\li shd         (>= 3.0.0)
-
-\subsection dep_gr_video_sdl gr-video-sdl: PAL and NTSC display
-\li SDL	        (>= 1.2.0)   http://www.libsdl.org/download-1.2.php
-
-\subsection dep_gr_comedi gr-comedi: Comedi hardware interface
-\li comedilib   (>= 0.8)     http://www.comedi.org/
-
-
-
-\section build_gr_cmake Building GNU Radio
-
-GNU Radio is built using the Cmake build system
-(http://www.cmake.org/). The standard build method is as follows:
-
-\code
-$ mkdir $(builddir)
-$ cd $(builddir)
-$ cmake [OPTIONS] $(srcdir)
-$ make
-$ make test
-$ sudo make install
-\endcode
-
-The \$(builddir) is the directory in which the code is built. This
-<b>cannot</b> be the same path as where the source code resides. Often,
-\$(builddir) is \$(srcdir)/build.
-
-\subsection Cmake Options
-
-Options can be used to specify where to find various library or
-include file dependencies that are not automatically being found
-(-DCMAKE_PREFIX_PATH) or set the prefix
-(-DCMAKE_INSTALL_PREFIX=(dir)).
-
-Components can also be enabled and disabled through the options. For a
-component named *gr-comp*, the option to disable would look like:
--DENABLE_GR_COMP=off. The "off" could also be "false" or "no", and
-cmake is not case sensitive about these options. Similarly, "true",
-"on", or "yes" will turn this component on. All components are enabled
-by default.
-
-An example is -DENABLE_PYTHON=False turns off building any Python or
-Swigging components. The result will be the GNU Radio libraries and
-C++ programs/applications/examples. No Python or GRC files will be
-built or installed.
-
-The -DENABLE_DEFAULT=False can be used to disable all
-components. Individual components can then be selectively turned back
-on. For example, just buidling the Volk and Gruel libraries can be
-done with this:
-
-\code
-cmake -DENABLE_DEFAULT=Off -DENABLE_VOLK=True -DENABLE_GRUEL=True <srcdir>
-\endcode
-
-
-The build type allows you to specify the build as a debug or release
-version. Each type sets different flags for different purposes. To set
-the build type, use:
-
-\code
--DCMAKE_BUILD_TYPE="Release"|"Debug"
-\endcode
-
-If not specified, the "Release" mode is the defaulted to.
-
-"Release" mode sets the '-O3' optimization flag.
-
-"Debug" mode sets '-g -O2' flags to export debug symbols and reduce
-the optimization to make the libraries easier to debug and step
-through.
-
-
-\subsection build_gr_cmake_e100 Building for the E100
-
-To build GNU Radio on the Ettus Research E100 embedded platforms,
-Cmake has to know that the processors uses the NEON extensions. Use
-the
-
-\code
-cmake -DCMAKE_CXX_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -g" \
-      -DCMAKE_C_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -g" \
-       <gr_source_dir>
-\endcode
diff --git a/docs/doxygen/other/volk_guide.dox b/docs/doxygen/other/extra_pages.dox
index 0e444ebbaf..d40c692e03 100644
--- a/docs/doxygen/other/volk_guide.dox
+++ b/docs/doxygen/other/extra_pages.dox
@@ -1,3 +1,166 @@
+/*! \page build_guide Build Instructions and Information
+
+\section dependencies Dependencies
+
+The list of GNU Radio dependencies and the minimum required versions,
+if any, to build the various GNU Radio components.
+
+Most of these components do not need to be individually compiled or
+installed. Instead, rely on your operating system's package manager or
+binary installation process (the <b>apt-get</b> system in Debian and
+Ubuntu, <b>yum</b> in RedHat and Fedora, etc.). GNU Radio tries to keep an
+up-to-date build guide for the majority of the supported operating
+systems on gnuradio.org
+(http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide).
+
+Not all dependencies are required for all components, and not all
+components are required for a given installation. The list of required
+components is determined by what the user requires from GNU Radio. If,
+for example, you do not use any Comedi-based hardware, do not worry
+about building gr-comedi.
+
+Before trying to build these from source, please try your system's
+installation tool (apt-get, pkg_install, YaST, yum, urpmi, etc.)
+first. Most recent systems have these packages available.
+
+\subsection dep_global Global Dependencies
+\li git                      http://code.google.com/p/msysgit
+\li cmake       (>= 2.6)     http://www.cmake.org/cmake/resources/software.html
+\li boost       (>= 1.35)    http://www.boostpro.com/download
+\li cppunit     (>= 1.9.14)  http://gaiacrtn.free.fr/cppunit/index.html
+\li fftw3f      (>= 3.0)     http://www.fftw.org/install/windows.html
+
+\subsection dep_python Python Wrappers
+\li python      (>= 2.5)     http://www.python.org/download/
+\li swig        (>= 1.3.31)  http://www.swig.org/download.html
+\li numpy       (>= 1.1.0)   http://sourceforge.net/projects/numpy/files/NumPy/
+
+\subsection dep_docs docs: Building the documentation
+\li doxygen     (>= 1.5)     http://www.stack.nl/~dimitri/doxygen/download.html
+
+\subsection dep_grc grc: The GNU Radio Companion
+\li Cheetah     (>= 2.0)     http://www.cheetahtemplate.org/
+\li pygtk       (>= 2.10)    http://www.pygtk.org/downloads.html
+
+\subsection dep_wavelet gr-wavelet: Collection of wavelet blocks
+\li gsl	        (>= 1.10)    http://gnuwin32.sourceforge.net/packages/gsl.htm
+
+\subsection dep_gr_qtgui gr-qtgui: The QT-based Graphical User Interface
+\li qt	        (>= 4.4)     http://qt.nokia.com/downloads/
+\li qwt         (>= 5.2)     http://sourceforge.net/projects/qwt/
+\li pyqt        (>= 4.4)     http://www.riverbankcomputing.co.uk/software/pyqt/download
+\li pyqwt       (>= 5.2)     http://pyqwt.sourceforge.net/download.html
+
+\subsection dep_gr_wxgui gr-wxgui: The WX-based Graphical User Interface
+\li wxpython    (>= 2.8)     http://www.wxpython.org/
+\li python-lxml (>= 1.3.6)   http://lxml.de/
+
+\subsection dep_gr_audio gr-audio: Audio Subsystems (system/OS dependent)
+\li audio-alsa  (>= 0.9)     http://www.alsa-project.org
+\li audio-jack  (>= 0.8)     http://jackaudio.org/
+\li portaduio   (>= 19)      http://www.portaudio.com/
+\li audio-oss   (>= 1.0)     http://www.opensound.com/oss.html
+\li audio-osx
+\li audio-windows
+
+It is not necessary to satisfy all of these dependencies; just the
+one(s) that are right for your system. On Linux, don't expect
+audio-osx and audio-windows to be either satisfied or built.
+
+\subsection dep_uhd uhd: The Ettus USRP Hardware Driver Interface
+\li uhd         (>= 3.0.0)   http://code.ettus.com/redmine/ettus/projects/uhd/wiki
+
+\subsection dep_shd shd: The Symplex Hardware Driver Interface
+\li shd         (>= 3.0.0)
+
+\subsection dep_gr_video_sdl gr-video-sdl: PAL and NTSC display
+\li SDL	        (>= 1.2.0)   http://www.libsdl.org/download-1.2.php
+
+\subsection dep_gr_comedi gr-comedi: Comedi hardware interface
+\li comedilib   (>= 0.8)     http://www.comedi.org/
+
+
+
+\section build_gr_cmake Building GNU Radio
+
+GNU Radio is built using the Cmake build system
+(http://www.cmake.org/). The standard build method is as follows:
+
+\code
+$ mkdir $(builddir)
+$ cd $(builddir)
+$ cmake [OPTIONS] $(srcdir)
+$ make
+$ make test
+$ sudo make install
+\endcode
+
+The \$(builddir) is the directory in which the code is built. This
+<b>cannot</b> be the same path as where the source code resides. Often,
+\$(builddir) is \$(srcdir)/build.
+
+\subsection Cmake Options
+
+Options can be used to specify where to find various library or
+include file dependencies that are not automatically being found
+(-DCMAKE_PREFIX_PATH) or set the prefix
+(-DCMAKE_INSTALL_PREFIX=(dir)).
+
+Components can also be enabled and disabled through the options. For a
+component named *gr-comp*, the option to disable would look like:
+-DENABLE_GR_COMP=off. The "off" could also be "false" or "no", and
+cmake is not case sensitive about these options. Similarly, "true",
+"on", or "yes" will turn this component on. All components are enabled
+by default.
+
+An example is -DENABLE_PYTHON=False turns off building any Python or
+Swigging components. The result will be the GNU Radio libraries and
+C++ programs/applications/examples. No Python or GRC files will be
+built or installed.
+
+The -DENABLE_DEFAULT=False can be used to disable all
+components. Individual components can then be selectively turned back
+on. For example, just buidling the Volk and Gruel libraries can be
+done with this:
+
+\code
+cmake -DENABLE_DEFAULT=Off -DENABLE_VOLK=True -DENABLE_GRUEL=True <srcdir>
+\endcode
+
+
+The build type allows you to specify the build as a debug or release
+version. Each type sets different flags for different purposes. To set
+the build type, use:
+
+\code
+-DCMAKE_BUILD_TYPE="Release"|"Debug"
+\endcode
+
+If not specified, the "Release" mode is the defaulted to.
+
+"Release" mode sets the '-O3' optimization flag.
+
+"Debug" mode sets '-g -O2' flags to export debug symbols and reduce
+the optimization to make the libraries easier to debug and step
+through.
+
+
+\subsection build_gr_cmake_e100 Building for the E100
+
+To build GNU Radio on the Ettus Research E100 embedded platforms,
+Cmake has to know that the processors uses the NEON extensions. Use
+the
+
+\code
+cmake -DCMAKE_CXX_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -g" \
+      -DCMAKE_C_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -g" \
+       <gr_source_dir>
+\endcode
+
+*/
+
+
+
 /*! \page volk_guide Instructions for using Volk in GNU Radio
 
 \section volk_intro Introduction
@@ -159,3 +322,5 @@ volk_config file that sets all architectures to 'generic' as a way to
 test the vectorized versus non-vectorized implementations.
 
 */
+
+
diff --git a/docs/doxygen/other/main_page.dox b/docs/doxygen/other/main_page.dox
index 68b0989436..8f69a97373 100644
--- a/docs/doxygen/other/main_page.dox
+++ b/docs/doxygen/other/main_page.dox
@@ -14,7 +14,7 @@ the <a href="http://gnuradio.squarespace.com" target="_blank"><b>GNU Radio blog<
 
 \section build Building GNU Radio
 
-See the \ref page_build page for details about the project's
+See the \ref build_guide page for details about the project's
 dependencies and build process.
 
 
diff --git a/gnuradio-core/src/lib/general/CMakeLists.txt b/gnuradio-core/src/lib/general/CMakeLists.txt
index 5c7b0f3745..3cf7f74e4c 100644
--- a/gnuradio-core/src/lib/general/CMakeLists.txt
+++ b/gnuradio-core/src/lib/general/CMakeLists.txt
@@ -207,6 +207,7 @@ set(gr_core_general_triple_threats
     gr_deinterleave
     gr_delay
     gr_encode_ccsds_27_bb
+    gr_endian_swap
     gr_fake_channel_coder_pp
     gr_feedforward_agc_cc
     gr_feval
diff --git a/gnuradio-core/src/lib/general/general.i b/gnuradio-core/src/lib/general/general.i
index c0ce655276..790549c4dd 100644
--- a/gnuradio-core/src/lib/general/general.i
+++ b/gnuradio-core/src/lib/general/general.i
@@ -60,6 +60,7 @@
 #include <gr_complex_to_interleaved_short.h>
 #include <gr_interleaved_short_to_complex.h>
 //#include <gr_endianness.h>
+#include <gr_endian_swap.h>
 #include <gr_firdes.h>
 #include <gr_interleave.h>
 #include <gr_deinterleave.h>
@@ -181,6 +182,7 @@
 %include "gr_complex_to_xxx.i"
 %include "gr_complex_to_interleaved_short.i"
 //%include "gr_endianness.i"
+%include "gr_endian_swap.i"
 %include "gr_interleaved_short_to_complex.i"
 %include "gr_firdes.i"
 %include "gr_interleave.i"
diff --git a/gnuradio-core/src/lib/general/gr_endian_swap.cc b/gnuradio-core/src/lib/general/gr_endian_swap.cc
new file mode 100644
index 0000000000..d86da5aa72
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_endian_swap.cc
@@ -0,0 +1,101 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_endian_swap.h>
+#include <gr_io_signature.h>
+#include <volk/volk.h>
+
+gr_endian_swap_sptr
+gr_make_endian_swap (size_t item_size_bytes)
+{
+  return gnuradio::get_initial_sptr(new gr_endian_swap (item_size_bytes));
+}
+
+gr_endian_swap::gr_endian_swap (size_t item_size_bytes)
+  : gr_sync_block ("gr_endian_swap",
+		   gr_make_io_signature (1, 1, item_size_bytes),
+		   gr_make_io_signature (1, 1, item_size_bytes))
+{
+  const int alignment_multiple = volk_get_alignment();
+  set_alignment(std::max(1,alignment_multiple));
+}
+
+int
+gr_endian_swap::work (int noutput_items,
+			 gr_vector_const_void_star &input_items,
+			 gr_vector_void_star &output_items)
+{
+  const char *in = (const char *) input_items[0];
+  char *out = (char *) output_items[0];
+
+  int nbytes( d_output_signature->sizeof_stream_item(0) );
+  if(is_unaligned()) {
+      switch(nbytes){
+        case 1:
+            memcpy(out,in,noutput_items);
+            break;
+        case 2:
+            memcpy(out,in,2*noutput_items);
+            volk_16u_byteswap_u((uint16_t*)out,noutput_items);
+            break;
+        case 4:
+            memcpy(out,in,4*noutput_items);
+            volk_32u_byteswap_u((uint32_t*)out,noutput_items);
+            break;
+        case 8:
+            memcpy(out,in,8*noutput_items);
+            volk_64u_byteswap_u((uint64_t*)out,noutput_items);
+            break;
+        default:
+            throw std::runtime_error("itemsize is not valid for gr_endian_swap!");
+        } 
+    } else {
+      switch(nbytes){
+        case 1:
+            memcpy(out,in,noutput_items);
+            break;
+        case 2:
+            memcpy(out,in,2*noutput_items);
+            volk_16u_byteswap_a((uint16_t*)out,noutput_items);
+            break;
+        case 4:
+            memcpy(out,in,4*noutput_items);
+            volk_32u_byteswap_a((uint32_t*)out,noutput_items);
+            break;
+        case 8:
+            memcpy(out,in,8*noutput_items);
+            volk_64u_byteswap_a((uint64_t*)out,noutput_items);
+            break;
+        default:
+            throw std::runtime_error("itemsize is not valid for gr_endian_swap!");
+        }
+    }
+
+  return noutput_items;
+}
+
+
+
diff --git a/gnuradio-core/src/lib/general/gr_endian_swap.h b/gnuradio-core/src/lib/general/gr_endian_swap.h
new file mode 100644
index 0000000000..0baa3f3389
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_endian_swap.h
@@ -0,0 +1,57 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_ENDIAN_SWAP_H
+#define INCLUDED_GR_ENDIAN_SWAP_H
+
+#include <gr_core_api.h>
+#include <gr_sync_block.h>
+
+class gr_endian_swap;
+typedef boost::shared_ptr<gr_endian_swap> gr_endian_swap_sptr;
+
+GR_CORE_API gr_endian_swap_sptr
+gr_make_endian_swap (size_t item_size_bytes=1);
+
+/*!
+ * \brief Convert stream of items into thier byte swapped version
+ *
+ * \param item_size_bytes number of bytes per item, 1=no-op,2=uint16_t,4=uint32_t,8=uint64_t
+ */
+
+class GR_CORE_API gr_endian_swap : public gr_sync_block
+{
+ private:
+  friend GR_CORE_API gr_endian_swap_sptr
+    gr_make_endian_swap (size_t item_size_bytes);
+  gr_endian_swap (size_t item_size_bytes);
+
+  size_t item_size_bytes;
+
+ public:
+  virtual int work (int noutput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items);
+};
+
+
+#endif /* INCLUDED_GR_ENDIAN_SWAP_H */
diff --git a/gnuradio-core/src/lib/general/gr_endian_swap.i b/gnuradio-core/src/lib/general/gr_endian_swap.i
new file mode 100644
index 0000000000..6058b9de77
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_endian_swap.i
@@ -0,0 +1,31 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,endian_swap)
+
+gr_endian_swap_sptr
+gr_make_endian_swap (size_t bytes_per_item=1);
+
+class gr_endian_swap : public gr_sync_block
+{
+public:
+};
diff --git a/gnuradio-core/src/python/gnuradio/gr/prefs.py b/gnuradio-core/src/python/gnuradio/gr/prefs.py
index 644aea8483..25fa8cd6ae 100644
--- a/gnuradio-core/src/python/gnuradio/gr/prefs.py
+++ b/gnuradio-core/src/python/gnuradio/gr/prefs.py
@@ -27,6 +27,7 @@ import ConfigParser
 import os
 import os.path
 import sys
+import glob
 
 
 def _user_prefs_filename():
@@ -53,18 +54,18 @@ class _prefs(_prefs_base):
     invoke the methods in this python class.
     """
     def __init__(self):
-	_prefs_base.__init__(self)
-	self.cp = ConfigParser.RawConfigParser()
-	self.__getattr__ = lambda self, name: getattr(self.cp, name)
+        _prefs_base.__init__(self)
+        self.cp = ConfigParser.RawConfigParser()
+        self.__getattr__ = lambda self, name: getattr(self.cp, name)
 
     def _sys_prefs_filenames(self):
         dir = _sys_prefs_dirname()
         try:
-            fnames = os.listdir(dir)
+            fnames = glob.glob(os.path.join(dir, '*.conf'))
         except (IOError, OSError):
             return []
         fnames.sort()
-        return [os.path.join(dir, f) for f in fnames]
+        return fnames
 
     def _read_files(self):
         filenames = self._sys_prefs_filenames()
diff --git a/gnuradio-core/src/python/gnuradio/gr/qa_endian_swap.py b/gnuradio-core/src/python/gnuradio/gr/qa_endian_swap.py
new file mode 100644
index 0000000000..4d2555cc4d
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/gr/qa_endian_swap.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+#
+# Copyright 2011,2012 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest
+import ctypes
+
+class test_endian_swap (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+
+    def tearDown (self):
+        self.tb = None
+
+    def test_001(self):
+
+        src_data = [1,2,3,4]
+        expected_result = [256, 512, 768, 1024];
+
+        src = gr.vector_source_s(src_data)
+        op = gr.endian_swap(2)
+        dst = gr.vector_sink_s()
+
+        self.tb.connect(src, op, dst)
+        self.tb.run()
+        result_data = list(dst.data())
+
+        self.assertEqual(expected_result, result_data)
+
+    def test_002(self):
+
+        src_data = [1,2,3,4]
+        expected_result = [16777216, 33554432, 50331648, 67108864];
+
+        src = gr.vector_source_i(src_data)
+        op = gr.endian_swap(4)
+        dst = gr.vector_sink_i()
+
+        self.tb.connect(src, op, dst)
+        self.tb.run()
+        result_data = list(dst.data())
+    
+        self.assertEqual(expected_result, result_data)
+
+if __name__ == '__main__':
+    gr_unittest.run(test_endian_swap, "test_endian_swap.xml")
+
diff --git a/gr-filter/lib/fir_filter.cc b/gr-filter/lib/fir_filter.cc
index 2334058241..6137dd2693 100644
--- a/gr-filter/lib/fir_filter.cc
+++ b/gr-filter/lib/fir_filter.cc
@@ -34,7 +34,7 @@ namespace gr {
 				     const std::vector<float> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(float);
+	d_naligned = std::max((size_t)1, d_align / sizeof(float));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
@@ -139,7 +139,7 @@ namespace gr {
 				     const std::vector<float> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(gr_complex);
+	d_naligned = std::max((size_t)1, d_align / sizeof(gr_complex));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
@@ -246,7 +246,7 @@ namespace gr {
 				     const std::vector<gr_complex> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(float);
+	d_naligned = std::max((size_t)1, d_align / sizeof(float));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
@@ -352,7 +352,7 @@ namespace gr {
 				     const std::vector<gr_complex> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(gr_complex);
+	d_naligned = std::max((size_t)1, d_align / sizeof(gr_complex));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
@@ -457,7 +457,7 @@ namespace gr {
 				     const std::vector<gr_complex> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(short);
+	d_naligned = std::max((size_t)1, d_align / sizeof(short));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
@@ -563,7 +563,7 @@ namespace gr {
 				     const std::vector<float> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(float);
+	d_naligned = std::max((size_t)1, d_align / sizeof(float));
 
 	d_aligned_taps = NULL;
 	set_taps(taps);
diff --git a/gr-filter/lib/fir_filter_with_buffer.cc b/gr-filter/lib/fir_filter_with_buffer.cc
index 7a35a92252..7bff8d4a77 100644
--- a/gr-filter/lib/fir_filter_with_buffer.cc
+++ b/gr-filter/lib/fir_filter_with_buffer.cc
@@ -38,7 +38,7 @@ namespace gr {
       fir_filter_with_buffer_fff::fir_filter_with_buffer_fff(const std::vector<float> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(float);
+	d_naligned = std::max((size_t)1, d_align / sizeof(float));
 
 	d_buffer_ptr = NULL;
 	d_aligned_taps = NULL;
@@ -191,7 +191,7 @@ namespace gr {
       fir_filter_with_buffer_ccc::fir_filter_with_buffer_ccc(const std::vector<gr_complex> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(gr_complex);
+	d_naligned = std::max((size_t)1, d_align / sizeof(gr_complex));
 
 	d_buffer_ptr = NULL;
 	d_aligned_taps = NULL;
@@ -344,7 +344,7 @@ namespace gr {
       fir_filter_with_buffer_ccf::fir_filter_with_buffer_ccf(const std::vector<float> &taps)
       {
 	d_align = volk_get_alignment();
-	d_naligned = d_align / sizeof(gr_complex);
+	d_naligned = std::max((size_t)1, d_align / sizeof(gr_complex));
 
 	d_buffer_ptr = NULL;
 	d_aligned_taps = NULL;
diff --git a/grc/blocks/block_tree.xml b/grc/blocks/block_tree.xml
index 3b5491a745..d7ec82e4ab 100644
--- a/grc/blocks/block_tree.xml
+++ b/grc/blocks/block_tree.xml
@@ -64,6 +64,8 @@
 		<block>gr_fft_vxx</block>
 		<block>blks2_logpwrfft_x</block>
 		<block>gr_vector_insert_x</block>
+
+        <block>gr_endian_swap</block>
 	</cat>
 	<cat>
 		<name>Type Conversions</name>
diff --git a/grc/blocks/gr_endian_swap.xml b/grc/blocks/gr_endian_swap.xml
new file mode 100644
index 0000000000..aa564026cd
--- /dev/null
+++ b/grc/blocks/gr_endian_swap.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0"?>
+<!--
+###################################################
+##Add Block:
+##	all types, 1 output, 2 to inf inputs
+###################################################
+ -->
+<block>
+	<name>Endian Swap</name>
+	<key>gr_endian_swap</key>
+	<import>from gnuradio import gr</import>
+	<make>gr.endian_swap($type.size)</make>
+	<param>
+		<name>IO Type</name>
+		<key>type</key>
+		<type>enum</type>
+		<option>
+			<name>Complex</name>
+			<key>complex</key>
+			<opt>size:8</opt>
+		</option>
+		<option>
+			<name>Int</name>
+			<key>s32</key>
+			<opt>size:4</opt>
+		</option>
+		<option>
+			<name>Short</name>
+			<key>s16</key>
+			<opt>size:2</opt>
+		</option>
+	</param>
+	<sink>
+		<name>in</name>
+		<type>$type</type>
+	</sink>
+	<source>
+		<name>out</name>
+		<type>$type</type>
+	</source>
+</block>
diff --git a/volk/include/volk/volk_32u_byteswap_u.h b/volk/include/volk/volk_32u_byteswap_u.h
new file mode 100644
index 0000000000..e27d1f03dd
--- /dev/null
+++ b/volk/include/volk/volk_32u_byteswap_u.h
@@ -0,0 +1,77 @@
+#ifndef INCLUDED_volk_32u_byteswap_u_H
+#define INCLUDED_volk_32u_byteswap_u_H
+
+#include <inttypes.h>
+#include <stdio.h>
+
+#ifdef LV_HAVE_SSE2
+#include <emmintrin.h>
+
+/*!
+  \brief Byteswaps (in-place) an aligned vector of int32_t's.
+  \param intsToSwap The vector of data to byte swap
+  \param numDataPoints The number of data points
+*/
+static inline void volk_32u_byteswap_u_sse2(uint32_t* intsToSwap, unsigned int num_points){
+  unsigned int number = 0;
+
+  uint32_t* inputPtr = intsToSwap;
+  __m128i input, byte1, byte2, byte3, byte4, output;
+  __m128i byte2mask = _mm_set1_epi32(0x00FF0000);
+  __m128i byte3mask = _mm_set1_epi32(0x0000FF00);
+
+  const uint64_t quarterPoints = num_points / 4;
+  for(;number < quarterPoints; number++){
+    // Load the 32t values, increment inputPtr later since we're doing it in-place.
+    input = _mm_loadu_si128((__m128i*)inputPtr);
+    // Do the four shifts
+    byte1 = _mm_slli_epi32(input, 24);
+    byte2 = _mm_slli_epi32(input, 8);
+    byte3 = _mm_srli_epi32(input, 8);
+    byte4 = _mm_srli_epi32(input, 24);
+    // Or bytes together
+    output = _mm_or_si128(byte1, byte4);
+    byte2 = _mm_and_si128(byte2, byte2mask);
+    output = _mm_or_si128(output, byte2);
+    byte3 = _mm_and_si128(byte3, byte3mask);
+    output = _mm_or_si128(output, byte3);
+    // Store the results
+    _mm_storeu_si128((__m128i*)inputPtr, output);
+    inputPtr += 4;
+  }
+
+  // Byteswap any remaining points:
+  number = quarterPoints*4;
+  for(; number < num_points; number++){
+    uint32_t outputVal = *inputPtr;
+    outputVal = (((outputVal >> 24) & 0xff) | ((outputVal >> 8) & 0x0000ff00) | ((outputVal << 8) & 0x00ff0000) | ((outputVal << 24) & 0xff000000));
+    *inputPtr = outputVal;
+    inputPtr++;
+  }
+}
+#endif /* LV_HAVE_SSE2 */
+
+#ifdef LV_HAVE_GENERIC
+/*!
+  \brief Byteswaps (in-place) an aligned vector of int32_t's.
+  \param intsToSwap The vector of data to byte swap
+  \param numDataPoints The number of data points
+*/
+static inline void volk_32u_byteswap_u_generic(uint32_t* intsToSwap, unsigned int num_points){
+  uint32_t* inputPtr = intsToSwap;
+
+  unsigned int point;
+  for(point = 0; point < num_points; point++){
+    uint32_t output = *inputPtr;
+    output = (((output >> 24) & 0xff) | ((output >> 8) & 0x0000ff00) | ((output << 8) & 0x00ff0000) | ((output << 24) & 0xff000000));
+
+    *inputPtr = output;
+    inputPtr++;
+  }
+}
+#endif /* LV_HAVE_GENERIC */
+
+
+
+
+#endif /* INCLUDED_volk_32u_byteswap_u_H */
diff --git a/volk/include/volk/volk_64u_byteswap_u.h b/volk/include/volk/volk_64u_byteswap_u.h
new file mode 100644
index 0000000000..41a4a3130f
--- /dev/null
+++ b/volk/include/volk/volk_64u_byteswap_u.h
@@ -0,0 +1,88 @@
+#ifndef INCLUDED_volk_64u_byteswap_u_H
+#define INCLUDED_volk_64u_byteswap_u_H
+
+#include <inttypes.h>
+#include <stdio.h>
+
+#ifdef LV_HAVE_SSE2
+#include <emmintrin.h>
+
+/*!
+  \brief Byteswaps (in-place) an aligned vector of int64_t's.
+  \param intsToSwap The vector of data to byte swap
+  \param numDataPoints The number of data points
+*/
+static inline void volk_64u_byteswap_u_sse2(uint64_t* intsToSwap, unsigned int num_points){
+    uint32_t* inputPtr = (uint32_t*)intsToSwap;
+    __m128i input, byte1, byte2, byte3, byte4, output;
+    __m128i byte2mask = _mm_set1_epi32(0x00FF0000);
+    __m128i byte3mask = _mm_set1_epi32(0x0000FF00);
+    uint64_t number = 0;
+    const unsigned int halfPoints = num_points / 2;
+    for(;number < halfPoints; number++){
+      // Load the 32t values, increment inputPtr later since we're doing it in-place.
+      input = _mm_loadu_si128((__m128i*)inputPtr);
+
+      // Do the four shifts
+      byte1 = _mm_slli_epi32(input, 24);
+      byte2 = _mm_slli_epi32(input, 8);
+      byte3 = _mm_srli_epi32(input, 8);
+      byte4 = _mm_srli_epi32(input, 24);
+      // Or bytes together
+      output = _mm_or_si128(byte1, byte4);
+      byte2 = _mm_and_si128(byte2, byte2mask);
+      output = _mm_or_si128(output, byte2);
+      byte3 = _mm_and_si128(byte3, byte3mask);
+      output = _mm_or_si128(output, byte3);
+
+      // Reorder the two words
+      output = _mm_shuffle_epi32(output, _MM_SHUFFLE(2, 3, 0, 1));
+
+      // Store the results
+      _mm_storeu_si128((__m128i*)inputPtr, output);
+      inputPtr += 4;
+    }
+
+    // Byteswap any remaining points:
+    number = halfPoints*2;
+    for(; number < num_points; number++){
+      uint32_t output1 = *inputPtr;
+      uint32_t output2 = inputPtr[1];
+
+      output1 = (((output1 >> 24) & 0xff) | ((output1 >> 8) & 0x0000ff00) | ((output1 << 8) & 0x00ff0000) | ((output1 << 24) & 0xff000000));
+
+      output2 = (((output2 >> 24) & 0xff) | ((output2 >> 8) & 0x0000ff00) | ((output2 << 8) & 0x00ff0000) | ((output2 << 24) & 0xff000000));
+
+      *inputPtr++ = output2;
+      *inputPtr++ = output1;
+    }
+}
+#endif /* LV_HAVE_SSE2 */
+
+#ifdef LV_HAVE_GENERIC
+/*!
+  \brief Byteswaps (in-place) an aligned vector of int64_t's.
+  \param intsToSwap The vector of data to byte swap
+  \param numDataPoints The number of data points
+*/
+static inline void volk_64u_byteswap_u_generic(uint64_t* intsToSwap, unsigned int num_points){
+  uint32_t* inputPtr = (uint32_t*)intsToSwap;
+  unsigned int point;
+  for(point = 0; point < num_points; point++){
+    uint32_t output1 = *inputPtr;
+    uint32_t output2 = inputPtr[1];
+
+    output1 = (((output1 >> 24) & 0xff) | ((output1 >> 8) & 0x0000ff00) | ((output1 << 8) & 0x00ff0000) | ((output1 << 24) & 0xff000000));
+
+    output2 = (((output2 >> 24) & 0xff) | ((output2 >> 8) & 0x0000ff00) | ((output2 << 8) & 0x00ff0000) | ((output2 << 24) & 0xff000000));
+
+    *inputPtr++ = output2;
+    *inputPtr++ = output1;
+  }
+}
+#endif /* LV_HAVE_GENERIC */
+
+
+
+
+#endif /* INCLUDED_volk_64u_byteswap_u_H */
diff --git a/volk/lib/CMakeLists.txt b/volk/lib/CMakeLists.txt
index 58bf026b43..d9aeb797c3 100644
--- a/volk/lib/CMakeLists.txt
+++ b/volk/lib/CMakeLists.txt
@@ -93,7 +93,9 @@ macro(check_arch arch_name)
             COMMAND ${PYTHON_EXECUTABLE} -c "import re; print(re.sub('\\W', '_', '${have_flag}'))"
             OUTPUT_VARIABLE have_flag OUTPUT_STRIP_TRAILING_WHITESPACE
         )
-        set(CMAKE_REQUIRED_FLAGS VOLK_FLAG_CHECK_FLAGS)
+        if(VOLK_FLAG_CHECK_FLAGS)
+            set(CMAKE_REQUIRED_FLAGS VOLK_FLAG_CHECK_FLAGS)
+        endif()
         CHECK_CXX_COMPILER_FLAG(${flag} ${have_flag})
         unset(CMAKE_REQUIRED_FLAGS)
         if (NOT ${have_flag})