/*

  Converting JPEG with JPEG6 library
  ==================================

  It was used in the kamery.c code until I needed a resampling ability.
  There wasnt any resampling mechanism for pure bitmap to be found, so
  I replaced the whole fetchImage for free image library (libgd.org) 
  
*/




/*****************************************************************************
 *                           Fetch image to encode
 *****************************************************************************/

static int
fetchImage(struct MemoryStruct *bmpdata)
{
	int result=1;
	
	struct MemoryStruct jpegdata;
	result &= GetImageWithCurl(&jpegdata, ARG_INPUTJPEGURL);
	result &= ConvertJpeg2Bmp(&jpegdata, bmpdata);
	free(jpegdata.memory);
	
	//printf("bmp: %p", bmpdata->memory);
	
	//BGR instead of RGB
	int i;
	char tmp;
	for (i = 0; i < bmpdata->size; i=i+3){
		tmp = bmpdata->memory[i];
		bmpdata->memory[i] = bmpdata->memory[i+2];
		bmpdata->memory[i+2] = tmp; 
	}
	
	//printf("bmp: %p", bmpdata->memory);

	return result;

}


/*****************************************************************************
 *                         Encode JPEG to bitmap
 *****************************************************************************/





#include <stdio.h>
#include "jpeglib.h"

/*
 * <setjmp.h> is used for the optional error recovery mechanism shown in
 * the second part of the example.
 */
#include <setjmp.h>


#include "kamery.h"



static void init_source (j_decompress_ptr cinfo)
{
  /* NOOP */
}

static boolean fill_input_buffer (j_decompress_ptr cinfo)
{
  struct jpeg_source_mgr *src = cinfo->src;

  //$WARNMS(cinfo, JWRN_JPEG_EOF);
  /* Insert a fake EOI marker */
  
	//src->next_input_byte[0] = (JOCTET) 0xFF;
  //src->next_input_byte[1] = (JOCTET) JPEG_EOI;
  //src->bytes_in_buffer = 2;

  return TRUE;
}

static void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
  struct jpeg_source_mgr *src = cinfo->src;

  if (num_bytes > 0) {
    while (num_bytes > (long) src->bytes_in_buffer) {
      num_bytes -= (long) src->bytes_in_buffer;
      (void) fill_input_buffer(cinfo);
      /* note we assume that fill_input_buffer will never return FALSE,
       * so suspension need not be handled.
       */
    }
    src->next_input_byte += (size_t) num_bytes;
    src->bytes_in_buffer -= (size_t) num_bytes;
  }
}

static void term_source (j_decompress_ptr cinfo)
{
  /* no work necessary here */
}

static void jpeg_memory_src (j_decompress_ptr cinfo, const char* buffer, size_t nbyte)
{
  struct jpeg_source_mgr *src;

  if (cinfo->src == NULL) {	/* first time for this JPEG object? */
    cinfo->src = (struct jpeg_source_mgr *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
				  sizeof(struct jpeg_source_mgr));
  }

  src = cinfo->src;
  src->next_input_byte = (JOCTET *)
    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
				nbyte * sizeof(JOCTET));
  src->init_source = init_source;
  src->fill_input_buffer = fill_input_buffer;
  src->skip_input_data = skip_input_data;
  src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
  src->term_source = term_source;
  src->bytes_in_buffer = nbyte; /* forces fill_input_buffer on first read */
  memcpy((char*) src->next_input_byte, buffer, nbyte);
}












/******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/

/* This half of the example shows how to read data from the JPEG decompressor.
 * It's a bit more refined than the above, in that we show:
 *   (a) how to modify the JPEG library's standard error-reporting behavior;
 *   (b) how to allocate workspace using the library's memory manager.
 *
 * Just to make this example a little different from the first one, we'll
 * assume that we do not intend to put the whole image into an in-memory
 * buffer, but to send it line-by-line someplace else.  We need a one-
 * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG
 * memory manager allocate it for us.  This approach is actually quite useful
 * because we don't need to remember to deallocate the buffer separately: it
 * will go away automatically when the JPEG object is cleaned up.
 */


/*
 * ERROR HANDLING:
 *
 * The JPEG library's standard error handler (jerror.c) is divided into
 * several "methods" which you can override individually.  This lets you
 * adjust the behavior without duplicating a lot of code, which you might
 * have to update with each future release.
 *
 * Our example here shows how to override the "error_exit" method so that
 * control is returned to the library's caller when a fatal error occurs,
 * rather than calling exit() as the standard error_exit method does.
 *
 * We use C's setjmp/longjmp facility to return control.  This means that the
 * routine which calls the JPEG library must first execute a setjmp() call to
 * establish the return point.  We want the replacement error_exit to do a
 * longjmp().  But we need to make the setjmp buffer accessible to the
 * error_exit routine.  To do this, we make a private extension of the
 * standard JPEG error handler object.  (If we were using C++, we'd say we
 * were making a subclass of the regular error handler.)
 *
 * Here's the extended error handler struct:
 */

struct my_error_mgr {
  struct jpeg_error_mgr pub;	/* "public" fields */

  jmp_buf setjmp_buffer;	/* for return to caller */
};

typedef struct my_error_mgr * my_error_ptr;

/*
 * Here's the routine that will replace the standard error_exit method:
 */

METHODDEF(void)
my_error_exit (j_common_ptr cinfo)
{
  /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
  my_error_ptr myerr = (my_error_ptr) cinfo->err;

  /* Always display the message. */
  /* We could postpone this until after returning, if we chose. */
  (*cinfo->err->output_message) (cinfo);

  /* Return control to the setjmp point */
  longjmp(myerr->setjmp_buffer, 1);
}




int
ConvertJpeg2Bmp(struct MemoryStruct *jpegdata, struct MemoryStruct *bmpdata)
{
  /* This struct contains the JPEG decompression parameters and pointers to
   * working space (which is allocated as needed by the JPEG library).
   */
  struct jpeg_decompress_struct cinfo;
  
	/* We use our private extension JPEG error handler.
   * Note that this struct must live as long as the main JPEG parameter
   * struct, to avoid dangling-pointer problems.
   */
  struct my_error_mgr jerr;
  
  /* More stuff */
  JSAMPARRAY buffer;		/* Output row buffer */
  int row_stride;		/* physical row width in output buffer */


  /* STEP 1: allocate and initialize JPEG decompression object */

  /* We set up the normal JPEG error routines, then override error_exit. */
  cinfo.err = jpeg_std_error(&jerr.pub);
  jerr.pub.error_exit = my_error_exit;
  /* Establish the setjmp return context for my_error_exit to use. */
  if (setjmp(jerr.setjmp_buffer)) {
    /* If we get here, the JPEG code has signaled an error.
     * We need to clean up the JPEG object, close the input file, and return.
     */
    jpeg_destroy_decompress(&cinfo);
    return 0;
  }
  /* Now we can initialize the JPEG decompression object. */
  jpeg_create_decompress(&cinfo);


  /* STEP 2: specify data source */
	jpeg_memory_src(&cinfo, jpegdata->memory, jpegdata->size);


  /* STEP 3: read file parameters with jpeg_read_header() */
  (void) jpeg_read_header(&cinfo, TRUE);
  /* We can ignore the return value from jpeg_read_header since
   *   (a) suspension is not possible with the stdio data source, and
   *   (b) we passed TRUE to reject a tables-only JPEG file as an error.
   * See libjpeg.doc for more info.
   */


  /* STEP 4: set parameters for decompression */
  /* In this example, we don't need to change any of the defaults set by
   * jpeg_read_header(), so we do nothing here.
   */


  /* STEP 5: Start decompressor */
  
  (void) jpeg_start_decompress(&cinfo);
  /* We can ignore the return value since suspension is not possible
   * with the stdio data source.
   */
  /* We may need to do some setup of our own at this point before reading
   * the data.  After jpeg_start_decompress() we have the correct scaled
   * output image dimensions available, as well as the output colormap
   * if we asked for color quantization.
   * In this example, we need to make an output work buffer of the right size.
   */ 
  /* JSAMPLEs per row in output buffer */
  row_stride = cinfo.output_width * cinfo.output_components;
  /* Make a one-row-high sample array that will go away when done with image */
  buffer = (*cinfo.mem->alloc_sarray)
		((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);

  /* STEP 6: while (scan lines remain to be read) */
  /*           jpeg_read_scanlines(...); */

  bmpdata->memory = NULL;
  bmpdata->size = 0;
  
  while (cinfo.output_scanline < cinfo.output_height) {
    /* jpeg_read_scanlines expects an array of pointers to scanlines.
     * Here the array is only one element long, but you could ask for
     * more than one scanline at a time if that's more convenient.
     */
    (void) jpeg_read_scanlines(&cinfo, buffer, 1);
    /* Assume put_scanline_someplace wants a pointer and sample count. */
    
		bmpdata->memory = (char *)myrealloc(bmpdata->memory, bmpdata->size + row_stride + 1);
		if (bmpdata->memory) {
			memcpy(&(bmpdata->memory[bmpdata->size]), buffer[0], row_stride);
			bmpdata->size += row_stride;
			bmpdata->memory[bmpdata->size] = 0;
		}
  }

  /* STEP 7: Finish decompression AND Release JPEG decompression object */
  (void) jpeg_finish_decompress(&cinfo);
  jpeg_destroy_decompress(&cinfo);

  /* At this point you may want to check to see whether any corrupt-data
   * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
   */

  return 1;
}


/*
 * SOME FINE POINTS:
 *
 * In the above code, we ignored the return value of jpeg_read_scanlines,
 * which is the number of scanlines actually read.  We could get away with
 * this because we asked for only one line at a time and we weren't using
 * a suspending data source.  See libjpeg.doc for more info.
 *
 * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress();
 * we should have done it beforehand to ensure that the space would be
 * counted against the JPEG max_memory setting.  In some systems the above
 * code would risk an out-of-memory error.  However, in general we don't
 * know the output image dimensions before jpeg_start_decompress(), unless we
 * call jpeg_calc_output_dimensions().  See libjpeg.doc for more about this.
 *
 * Scanlines are returned in the same order as they appear in the JPEG file,
 * which is standardly top-to-bottom.  If you must emit data bottom-to-top,
 * you can use one of the virtual arrays provided by the JPEG memory manager
 * to invert the data.  See wrbmp.c for an example.
 *
 * As with compression, some operating modes may require temporary files.
 * On some systems you may need to set up a signal handler to ensure that
 * temporary files are deleted if the program is interrupted.  See libjpeg.doc.
 */