text: 
  #include <TH.h>
  #include <luaT.h>
  #include "jpeglib.h"
  #include <setjmp.h>
  
  #if LUA_VERSION_NUM >= 503
  #define luaL_checkint(L,n)      ((int)luaL_checkinteger(L, (n)))
  #endif
  
  
  #define torch_(NAME) TH_CONCAT_3(torch_, Real, NAME)
  #define torch_Tensor TH_CONCAT_STRING_3(torch., Real, Tensor)
  #define libjpeg_(NAME) TH_CONCAT_3(libjpeg_, Real, NAME)
  
  static void
  jpeg_mem_src_dummy(j_decompress_ptr c, unsigned char *ibuf, unsigned long isiz)
  {
  }
  
  static void
  jpeg_mem_dest_dummy(j_compress_ptr c, unsigned char **obuf, unsigned long *osiz)
  {
  }
  
  #define JPEG_MEM_SRC_NOT_DEF  "`jpeg_mem_src` is not defined."
  #define JPEG_MEM_DEST_NOT_DEF "`jpeg_mem_dest` is not defined."
  #define JPEG_REQUIRED_VERSION " Use libjpeg v8+, libjpeg-turbo 1.3+ or build" \
                                " libjpeg-turbo with `--with-mem-srcdst`."
  
  #define JPEG_MEM_SRC_ERR_MSG  JPEG_MEM_SRC_NOT_DEF JPEG_REQUIRED_VERSION
  #define JPEG_MEM_DEST_ERR_MSG JPEG_MEM_DEST_NOT_DEF JPEG_REQUIRED_VERSION
  
  #if !defined(HAVE_JPEG_MEM_SRC)
  #define jpeg_mem_src jpeg_mem_src_dummy
  #endif
  
  #if !defined(HAVE_JPEG_MEM_DEST)
  #define jpeg_mem_dest jpeg_mem_dest_dummy
  #endif
  
  #include "generic/jpeg.c"
  #include "THGenerateAllTypes.h"
  
  #include "image.h"
  
  IMAGE_API int luaopen_libjpg(lua_State *L)
  {
    libjpeg_FloatMain_init(L);
    libjpeg_DoubleMain_init(L);
    libjpeg_ByteMain_init(L);
  
    lua_newtable(L);
    lua_pushvalue(L, -1);
    lua_setglobal(L, "libjpeg");
  
    lua_newtable(L);
    luaT_setfuncs(L, libjpeg_DoubleMain__, 0);
    lua_setfield(L, -2, "double");
  
    lua_newtable(L);
    luaT_setfuncs(L, libjpeg_FloatMain__, 0);
    lua_setfield(L, -2, "float");
  
    lua_newtable(L);
    luaT_setfuncs(L, libjpeg_ByteMain__, 0);
    lua_setfield(L, -2, "byte");
  
    return 1;
  }
  