#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"

DLL_EXPORT int luaopen_libjpeg(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;
}