diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e81136a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,10 @@
+all: piphoto
+
+piphoto: piphoto.cc Makefile
+	clang-3.9 -O3 -g -Weverything -Werror -Wno-c++98-compat -Wno-c++98-c++11-compat-pedantic --std=c++1z --stdlib=libc++ -o piphoto piphoto.cc -lc++ -lunwind -lpng
+
+run: piphoto
+	./piphoto
+
+clean:
+	rm -f piphoto
diff --git a/piphoto.cc b/piphoto.cc
new file mode 100644
index 0000000..b9ff0e6
--- /dev/null
+++ b/piphoto.cc
@@ -0,0 +1,214 @@
+#include <arpa/inet.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <png.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <array>
+#include <experimental/string_view>
+#include <iostream>
+#include <string>
+
+namespace std {
+using string_view = experimental::string_view;
+}
+
+std::string ReadFile(const std::string& filename);
+void WriteFile(const std::string& filename, const std::string& contents);
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+class PiRaw {
+ public:
+  struct Pixel {
+    // 32-bit for compiler convenience, but values are 16-bit
+    uint32_t r;
+    uint32_t g;
+    uint32_t b;
+  };
+  typedef std::array<std::array<Pixel, X>, Y> Image;
+
+  PiRaw(std::unique_ptr<Image>);
+  static PiRaw FromJpeg(const std::string_view& jpeg);
+  static PiRaw FromRaw(const std::string_view& raw);
+
+  std::string ToPng();
+
+ private:
+  static constexpr uint32_t kJpegHeaderBytes = 32768;
+  static constexpr const char* kJpegHeaderMagic = "BRCM";
+  static constexpr uint32_t kPixelsPerChunk = 4;
+  static constexpr uint32_t kBitsPerByte = 8;
+
+  static constexpr uint32_t GetRawBytes();
+  static constexpr uint32_t GetRowBytes();
+  static constexpr uint32_t GetNumRows();
+  static constexpr uint32_t GetChunkBytes();
+
+  static constexpr uint32_t Align(uint32_t val);
+
+  typedef std::array<uint32_t, kPixelsPerChunk> Chunk;
+
+  static Chunk GetChunk(const std::string_view& raw, const uint32_t x_chunk, const uint32_t y);
+  static Pixel CombineRaw(uint32_t y0x0, uint32_t y0x1, uint32_t y1x0, uint32_t y1x1);
+
+  std::unique_ptr<Image> image_;
+};
+
+typedef PiRaw<3280,2464,10,16,2> PiRaw2;
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+PiRaw<X,Y,D,A,P>::PiRaw(std::unique_ptr<Image> image)
+    : image_(std::move(image)) {}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+PiRaw<X,Y,D,A,P> PiRaw<X,Y,D,A,P>::FromJpeg(const std::string_view& jpeg) {
+  auto container_len = GetRawBytes() + kJpegHeaderBytes;
+  assert(jpeg.substr(jpeg.size() - container_len, 4) == kJpegHeaderMagic);
+  return FromRaw(jpeg.substr(jpeg.size() - GetRawBytes(), GetRawBytes()));
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+PiRaw<X,Y,D,A,P> PiRaw<X,Y,D,A,P>::FromRaw(const std::string_view& raw) {
+  static_assert(X % 2 == 0);
+  static_assert(Y % 2 == 0);
+  static_assert(kPixelsPerChunk == 4);
+
+  assert(raw.size() == GetRawBytes());
+
+  auto image = std::make_unique<Image>();
+
+  for (uint32_t y = 0, out_y = 0; y < Y; y += 2, ++out_y) {
+    for (uint32_t x_chunk = 0, out_x = 0; x_chunk < X / kPixelsPerChunk; ++x_chunk, out_x += kPixelsPerChunk / 2) {
+      auto chunk1 = GetChunk(raw, x_chunk, y + 0);
+      auto chunk2 = GetChunk(raw, x_chunk, y + 1);
+      image->at(out_y).at(out_x + 0) = CombineRaw(chunk1.at(0), chunk1.at(1), chunk2.at(0), chunk2.at(1));
+      image->at(out_y).at(out_x + 1) = CombineRaw(chunk1.at(2), chunk1.at(3), chunk2.at(2), chunk2.at(3));
+    }
+  }
+  return PiRaw<X,Y,D,A,P>(std::move(image));
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+constexpr uint32_t PiRaw<X,Y,D,A,P>::GetRawBytes() {
+  return GetRowBytes() * GetNumRows();
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+constexpr uint32_t PiRaw<X,Y,D,A,P>::GetRowBytes() {
+  return Align(Align(X + P) * D / kBitsPerByte);
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+constexpr uint32_t PiRaw<X,Y,D,A,P>::GetNumRows() {
+  return Align(Y + P);
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+constexpr uint32_t PiRaw<X,Y,D,A,P>::GetChunkBytes() {
+  return D * kPixelsPerChunk / kBitsPerByte;
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+constexpr uint32_t PiRaw<X,Y,D,A,P>::Align(uint32_t val) {
+  return (~(A - 1)) & ((val) + (A - 1));
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+typename PiRaw<X,Y,D,A,P>::Chunk PiRaw<X,Y,D,A,P>::GetChunk(const std::string_view& raw, const uint32_t x_chunk, const uint32_t y) {
+  // Function is bit depth & layout specific
+  static_assert(D == 10);
+
+  auto start = y * GetRowBytes() + x_chunk * GetChunkBytes();
+  auto high0 = static_cast<uint32_t>(raw.at(start + 0));
+  auto high1 = static_cast<uint32_t>(raw.at(start + 1));
+  auto high2 = static_cast<uint32_t>(raw.at(start + 2));
+  auto high3 = static_cast<uint32_t>(raw.at(start + 3));
+  auto packed_low = static_cast<uint32_t>(raw.at(start + 4));
+
+  Chunk ret;
+  ret.at(0) = ((high0 << 2) | ((packed_low >> 6) & 0b11)) << 6;
+  ret.at(1) = ((high1 << 2) | ((packed_low >> 4) & 0b11)) << 6;
+  ret.at(2) = ((high2 << 2) | ((packed_low >> 2) & 0b11)) << 6;
+  ret.at(3) = ((high3 << 2) | ((packed_low >> 0) & 0b11)) << 6;
+  return ret;
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+typename PiRaw<X,Y,D,A,P>::Pixel PiRaw<X,Y,D,A,P>::CombineRaw(uint32_t y0x0, uint32_t y0x1, uint32_t y1x0, uint32_t y1x1) {
+  // Function is bit layout specific
+  Pixel ret;
+  ret.r = y1x1;
+  ret.g = (y0x1 + y1x0) / 2;
+  ret.b = y0x0;
+  return ret;
+}
+
+static void WriteCallback(png_structp png_ptr, png_bytep data, png_size_t length) {
+  auto dest = static_cast<std::string*>(png_get_io_ptr(png_ptr));
+  dest->append(reinterpret_cast<char*>(data), length);
+}
+
+template <uint32_t X, uint32_t Y, uint32_t D, uint32_t A, uint32_t P>
+std::string PiRaw<X,Y,D,A,P>::ToPng() {
+  std::string ret;
+
+  auto png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  assert(png_ptr);
+  auto info_ptr = png_create_info_struct(png_ptr);
+  assert(info_ptr);
+
+  png_set_write_fn(png_ptr, &ret, &WriteCallback, nullptr);
+  png_set_IHDR(png_ptr, info_ptr, X / 2, Y / 2,
+    16, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+    PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+
+  png_write_info(png_ptr, info_ptr);
+  for (auto& row : *image_) {
+    std::array<uint16_t, X * 3> out_row;
+    for (uint32_t x = 0; x < X; ++x) {
+      out_row[x * 3 + 0] = htons(static_cast<uint16_t>(row[x].r));
+      out_row[x * 3 + 1] = htons(static_cast<uint16_t>(row[x].g));
+      out_row[x * 3 + 2] = htons(static_cast<uint16_t>(row[x].b));
+    }
+    png_write_row(png_ptr, reinterpret_cast<unsigned char*>(out_row.data()));
+  }
+  png_write_end(png_ptr, nullptr);
+
+  png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+  png_destroy_write_struct(&png_ptr, &info_ptr);
+
+  return ret;
+}
+
+
+std::string ReadFile(const std::string& filename) {
+  int fh = open(filename.c_str(), O_RDONLY);
+  assert(fh != -1);
+
+  struct stat st;
+  assert(fstat(fh, &st) == 0);
+  
+  std::string contents;
+  contents.resize(static_cast<size_t>(st.st_size));
+
+  assert(read(fh, &contents[0], static_cast<size_t>(st.st_size)) == st.st_size);
+  assert(close(fh) == 0);
+
+  return contents;
+}
+
+
+void WriteFile(const std::string& filename, const std::string& contents) {
+  int fh = open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0644);
+  assert(fh != -1);
+  assert(write(fh, &contents[0], contents.size()) == static_cast<ssize_t>(contents.size()));
+  assert(close(fh) == 0);
+}
+
+
+int main() {
+  auto raw = PiRaw2::FromJpeg(ReadFile("test.jpg"));
+  WriteFile("test.png", raw.ToPng());
+}