// ==========================================================

// JNG loader

//

// Design and implementation by

// - Herve Drolon (drolon@infonie.fr)

//

// This file is part of FreeImage 3

//

// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES

// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE

// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED

// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT

// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY

// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL

// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER

// THIS DISCLAIMER.

//

// Use at your own risk!

// ==========================================================

#include "FreeImage.h"

#include "Utilities.h"

// ==========================================================

// Plugin Interface

// ==========================================================

static int s_format_id;

// ----------------------------------------------------------

#define JNG_SIGNATURE_SIZE 8  // size of the signature

// ----------------------------------------------------------

// ----------------------------------------------------------

//   mng interface (see MNGHelper.cpp)

// ----------------------------------------------------------

FIBITMAP* mng_ReadChunks(int format_id, FreeImageIO *io, fi_handle handle, long Offset, int flags = 0);

BOOL mng_WriteJNG(int format_id, FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int flags);

// ==========================================================

// Plugin Implementation

// ==========================================================

static const char * DLL_CALLCONV

Format() {

  return "JNG";

}

static const char * DLL_CALLCONV

Description() {

  return "JPEG Network Graphics";

}

static const char * DLL_CALLCONV

Extension() {

  return "jng";

}

static const char * DLL_CALLCONV

RegExpr() {

  return NULL;

}

static const char * DLL_CALLCONV

MimeType() {

  return "image/x-mng";

}

static BOOL DLL_CALLCONV

Validate(FreeImageIO *io, fi_handle handle) {

  BYTE jng_signature[8] = { 139, 74, 78, 71, 13, 10, 26, 10 };

  BYTE signature[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

  io->read_proc(&signature, 1, JNG_SIGNATURE_SIZE, handle);

  return (memcmp(jng_signature, signature, JNG_SIGNATURE_SIZE) == 0) ? TRUE : FALSE;

}

static BOOL DLL_CALLCONV

SupportsExportDepth(int depth) {

  return (

      (depth == 8) ||

      (depth == 24) ||

      (depth == 32)

    );

}

static BOOL DLL_CALLCONV 

SupportsExportType(FREE_IMAGE_TYPE type) {

  return (type == FIT_BITMAP) ? TRUE : FALSE;

}

static BOOL DLL_CALLCONV

SupportsICCProfiles() {

  return TRUE;

}

static BOOL DLL_CALLCONV

SupportsNoPixels() {

  return TRUE;

}

// ----------------------------------------------------------

static void * DLL_CALLCONV

Open(FreeImageIO *io, fi_handle handle, BOOL read) {

  return NULL;

}

static void DLL_CALLCONV

Close(FreeImageIO *io, fi_handle handle, void *data) {

}

static FIBITMAP * DLL_CALLCONV

Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {

  long offset = JNG_SIGNATURE_SIZE; // move to skip first 8 bytes of signature

  // check the signature (8 bytes)

  if(Validate(io, handle) == FALSE) {

    return NULL;

  }

  // parse chunks and decode a jng or mng bitmap

  return mng_ReadChunks(s_format_id, io, handle, offset, flags);

}

static BOOL DLL_CALLCONV

Save(FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int page, int flags, void *data) {

  return mng_WriteJNG(s_format_id, io, dib, handle, flags);

}

// ==========================================================

//   Init

// ==========================================================

void DLL_CALLCONV

InitJNG(Plugin *plugin, int format_id) {

  s_format_id = format_id;

  plugin->format_proc = Format;

  plugin->description_proc = Description;

  plugin->extension_proc = Extension;

  plugin->regexpr_proc = RegExpr;

  plugin->open_proc = Open;

  plugin->close_proc = Close;

  plugin->pagecount_proc = NULL;

  plugin->pagecapability_proc = NULL;

  plugin->load_proc = Load;

  plugin->save_proc = Save;

  plugin->validate_proc = Validate;

  plugin->mime_proc = MimeType;

  plugin->supports_export_bpp_proc = SupportsExportDepth;

  plugin->supports_export_type_proc = SupportsExportType;

  plugin->supports_icc_profiles_proc = SupportsICCProfiles;

  plugin->supports_no_pixels_proc = SupportsNoPixels;

}