/* -*- mode: C++; tab-width: 4 -*- */
/* ================================================================================== */
/* Copyright (c) 1998-1999 3Com Corporation or its subsidiaries. All rights reserved. */
/* ================================================================================== */

#include "EmulatorCommon.h"
#include "JPEGGlue.h"

#include "Platform.h"

// jmorecfg.h tries to typedef uae_u32 to be a long.  BASETSD.H
// already defines uae_u32 to be an int.  Fortunately, they amount
// to the same thing, so we can turn off the jmorecfg.h attempt
// by defining the following symbol.

#define XMD_H 1

// jmorecfg.h also tries to define FAR.  Undefine the one set up
// by windef.h.  Yes, that gives us two different definitions of
// FAR, but hopefully that won't lead to conflict.

#undef FAR


// ========== Cribbed from jdatasrc.c ==========
//
// These routines are "data source" routines that work from
// an in-memory buffer.  They are modified from the jdatasrc.c
// routines that provide input from a stdio file.

/*
 * jdatasrc.c
 *
 * Copyright (C) 1994-1996, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains decompression data source routines for the case of
 * reading JPEG data from a file (or any stdio stream).  While these routines
 * are sufficient for most applications, some will want to use a different
 * source manager.
 * IMPORTANT: we assume that fread() will correctly transcribe an array of
 * JOCTETs from 8-bit-wide elements on external storage.  If char is wider
 * than 8 bits on your machine, you may need to do some tweaking.
 */

extern "C"
{
/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
#include "jinclude.h"
#include "jpeglib.h"
#include "jerror.h"
}

/* Expanded data source object for stdio input */

struct my_source_mgr
{
	struct jpeg_source_mgr	pub;			/* public fields */
};

typedef my_source_mgr*	my_src_ptr;


/*
 * Initialize source --- called by jpeg_read_header
 * before any data is actually read.
 */

METHODDEF(void)
init_source (j_decompress_ptr cinfo)
{
	my_src_ptr	src = (my_src_ptr) cinfo->src;
}


/*
 * Fill the input buffer --- called whenever buffer is emptied.
 *
 * In typical applications, this should read fresh data into the buffer
 * (ignoring the current state of next_input_byte & bytes_in_buffer),
 * reset the pointer & count to the start of the buffer, and return TRUE
 * indicating that the buffer has been reloaded.  It is not necessary to
 * fill the buffer entirely, only to obtain at least one more byte.
 *
 * There is no such thing as an EOF return.  If the end of the file has been
 * reached, the routine has a choice of ERREXIT() or inserting fake data into
 * the buffer.  In most cases, generating a warning message and inserting a
 * fake EOI marker is the best course of action --- this will allow the
 * decompressor to output however much of the image is there.  However,
 * the resulting error message is misleading if the real problem is an empty
 * input file, so we handle that case specially.
 *
 * In applications that need to be able to suspend compression due to input
 * not being available yet, a FALSE return indicates that no more data can be
 * obtained right now, but more may be forthcoming later.  In this situation,
 * the decompressor will return to its caller (with an indication of the
 * number of scanlines it has read, if any).  The application should resume
 * decompression after it has loaded more data into the input buffer.  Note
 * that there are substantial restrictions on the use of suspension --- see
 * the documentation.
 *
 * When suspending, the decompressor will back up to a convenient restart point
 * (typically the start of the current MCU). next_input_byte & bytes_in_buffer
 * indicate where the restart point will be if the current call returns FALSE.
 * Data beyond this point must be rescanned after resumption, so move it to
 * the front of the buffer rather than discarding it.
 */

METHODDEF(boolean)
fill_input_buffer (j_decompress_ptr cinfo)
{
	my_src_ptr	src = (my_src_ptr) cinfo->src;

	assert (false);

	return TRUE;
}


/*
 * Skip data --- used to skip over a potentially large amount of
 * uninteresting data (such as an APPn marker).
 *
 * Writers of suspendable-input applications must note that skip_input_data
 * is not granted the right to give a suspension return.  If the skip extends
 * beyond the data currently in the buffer, the buffer can be marked empty so
 * that the next read will cause a fill_input_buffer call that can suspend.
 * Arranging for additional bytes to be discarded before reloading the input
 * buffer is the application writer's problem.
 */

METHODDEF(void)
skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
	my_src_ptr	src = (my_src_ptr) cinfo->src;

	src->pub.next_input_byte += (size_t) num_bytes;
	src->pub.bytes_in_buffer -= (size_t) num_bytes;
}


/*
 * An additional method that can be provided by data source modules is the
 * resync_to_restart method for error recovery in the presence of RST markers.
 * For the moment, this source module just uses the default resync method
 * provided by the JPEG library.  That method assumes that no backtracking
 * is possible.
 */


/*
 * Terminate source --- called by jpeg_finish_decompress
 * after all data has been read.  Often a no-op.
 *
 * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
 * application must deal with any cleanup that should happen even
 * for error exit.
 */

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


/*
 * Prepare for input from a stdio stream.
 * The caller must have already opened the stream, and is responsible
 * for closing it after finishing decompression.
 */

LOCAL(void)
jpeg_mem_src (j_decompress_ptr cinfo, const JOCTET* inbuffer, size_t inbuffersize)
{
  my_src_ptr src;

  /* The source object and input buffer are made permanent so that a series
   * of JPEG images can be read from the same file by calling jpeg_stdio_src
   * only before the first one.  (If we discarded the buffer at the end of
   * one image, we'd likely lose the start of the next one.)
   * This makes it unsafe to use this manager and a different source
   * manager serially with the same JPEG object.  Caveat programmer.
   */
	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(my_source_mgr));
	}

	src = (my_src_ptr) cinfo->src;
	src->pub.init_source		= &init_source;
	src->pub.fill_input_buffer	= &fill_input_buffer;
	src->pub.skip_input_data	= &skip_input_data;
	src->pub.resync_to_restart	= &jpeg_resync_to_restart; /* use default method */
	src->pub.term_source		= &term_source;

	src->pub.next_input_byte	= inbuffer;
	src->pub.bytes_in_buffer	= inbuffersize;
}

// ========== Cribbed from cdjpeg.h ==========

/*
 * cdjpeg.h
 *
 * Copyright (C) 1994-1997, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains common declarations for the sample applications
 * cjpeg and djpeg.  It is NOT used by the core JPEG library.
 */

#define JPEG_CJPEG_DJPEG	/* define proper options in jconfig.h */
#define JPEG_INTERNAL_OPTIONS	/* cjpeg.c,djpeg.c need to see xxx_SUPPORTED */
#include "jinclude.h"
#include "jpeglib.h"
#include "jerror.h"		/* get library error codes too */
#include "cderror.h"		/* get application-specific error codes */


/*
 * Object interface for cjpeg's source file decoding modules
 */

typedef struct cjpeg_source_struct * cjpeg_source_ptr;

struct cjpeg_source_struct {
  JMETHOD(void, start_input, (j_compress_ptr cinfo,
			      cjpeg_source_ptr sinfo));
  JMETHOD(JDIMENSION, get_pixel_rows, (j_compress_ptr cinfo,
				       cjpeg_source_ptr sinfo));
  JMETHOD(void, finish_input, (j_compress_ptr cinfo,
			       cjpeg_source_ptr sinfo));

  FILE *input_file;

  JSAMPARRAY buffer;
  JDIMENSION buffer_height;
};


/*
 * Object interface for djpeg's output file encoding modules
 */

typedef struct djpeg_dest_struct * djpeg_dest_ptr;

struct djpeg_dest_struct {
  /* start_output is called after jpeg_start_decompress finishes.
   * The color map will be ready at this time, if one is needed.
   */
  JMETHOD(void, start_output, (j_decompress_ptr cinfo,
			       djpeg_dest_ptr dinfo));
  /* Emit the specified number of pixel rows from the buffer. */
  JMETHOD(void, put_pixel_rows, (j_decompress_ptr cinfo,
				 djpeg_dest_ptr dinfo,
				 JDIMENSION rows_supplied));
  /* Finish up at the end of the image. */
  JMETHOD(void, finish_output, (j_decompress_ptr cinfo,
				djpeg_dest_ptr dinfo));

  /* Target file spec; filled in by djpeg.c after object is created. */
//  FILE * output_file;
  void*			bitmap;
  size_t		bmOffset;
  size_t		bmSize;

  /* Output pixel-row buffer.  Created by module init or start_output.
   * Width is cinfo->output_width * cinfo->output_components;
   * height is buffer_height.
   */
  JSAMPARRAY buffer;
  JDIMENSION buffer_height;
};


/*
 * cjpeg/djpeg may need to perform extra passes to convert to or from
 * the source/destination file format.  The JPEG library does not know
 * about these passes, but we'd like them to be counted by the progress
 * monitor.  We use an expanded progress monitor object to hold the
 * additional pass count.
 */

struct cdjpeg_progress_mgr {
  struct jpeg_progress_mgr pub;	/* fields known to JPEG library */
  int completed_extra_passes;	/* extra passes completed */
  int total_extra_passes;	/* total extra */
  /* last printed percentage stored here to avoid multiple printouts */
  int percent_done;
};

typedef struct cdjpeg_progress_mgr * cd_progress_ptr;


/* Short forms of external names for systems with brain-damaged linkers. */

#ifdef NEED_SHORT_EXTERNAL_NAMES
#define jinit_read_bmp		jIRdBMP
#define jinit_write_bmp		jIWrBMP
#define jinit_read_gif		jIRdGIF
#define jinit_write_gif		jIWrGIF
#define jinit_read_ppm		jIRdPPM
#define jinit_write_ppm		jIWrPPM
#define jinit_read_rle		jIRdRLE
#define jinit_write_rle		jIWrRLE
#define jinit_read_targa	jIRdTarga
#define jinit_write_targa	jIWrTarga
#define read_quant_tables	RdQTables
#define read_scan_script	RdScnScript
#define set_quant_slots		SetQSlots
#define set_sample_factors	SetSFacts
#define read_color_map		RdCMap
#define enable_signal_catcher	EnSigCatcher
#define start_progress_monitor	StProgMon
#define end_progress_monitor	EnProgMon
#define read_stdin		RdStdin
#define write_stdout		WrStdout
#endif /* NEED_SHORT_EXTERNAL_NAMES */

/* Module selection routines for I/O modules. */

EXTERN(cjpeg_source_ptr) jinit_read_bmp JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_bmp JPP((j_decompress_ptr cinfo,
					    boolean is_os2));
EXTERN(cjpeg_source_ptr) jinit_read_gif JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_gif JPP((j_decompress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_ppm JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_ppm JPP((j_decompress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_rle JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_rle JPP((j_decompress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_targa JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_targa JPP((j_decompress_ptr cinfo));

/* cjpeg support routines (in rdswitch.c) */

EXTERN(boolean) read_quant_tables JPP((j_compress_ptr cinfo, char * filename,
				    int scale_factor, boolean force_baseline));
EXTERN(boolean) read_scan_script JPP((j_compress_ptr cinfo, char * filename));
EXTERN(boolean) set_quant_slots JPP((j_compress_ptr cinfo, char *arg));
EXTERN(boolean) set_sample_factors JPP((j_compress_ptr cinfo, char *arg));

/* djpeg support routines (in rdcolmap.c) */

EXTERN(void) read_color_map JPP((j_decompress_ptr cinfo, FILE * infile));

/* common support routines (in cdjpeg.c) */

EXTERN(void) enable_signal_catcher JPP((j_common_ptr cinfo));
EXTERN(void) start_progress_monitor JPP((j_common_ptr cinfo,
					 cd_progress_ptr progress));
EXTERN(void) end_progress_monitor JPP((j_common_ptr cinfo));
EXTERN(boolean) keymatch JPP((char * arg, const char * keyword, int minchars));
EXTERN(FILE *) read_stdin JPP((void));
EXTERN(FILE *) write_stdout JPP((void));

/* miscellaneous useful macros */

#ifdef DONT_USE_B_MODE		/* define mode parameters for fopen() */
#define READ_BINARY	"r"
#define WRITE_BINARY	"w"
#else
#ifdef VMS			/* VMS is very nonstandard */
#define READ_BINARY	"rb", "ctx=stm"
#define WRITE_BINARY	"wb", "ctx=stm"
#else				/* standard ANSI-compliant case */
#define READ_BINARY	"rb"
#define WRITE_BINARY	"wb"
#endif
#endif

#ifndef EXIT_FAILURE		/* define exit() codes if not provided */
#define EXIT_FAILURE  1
#endif
#ifndef EXIT_SUCCESS
#ifdef VMS
#define EXIT_SUCCESS  1		/* VMS is very nonstandard */
#else
#define EXIT_SUCCESS  0
#endif
#endif
#ifndef EXIT_WARNING
#ifdef VMS
#define EXIT_WARNING  1		/* VMS is very nonstandard */
#else
#define EXIT_WARNING  2
#endif
#endif


// ========== Cribbed from wrbmp.c ==========

/*
 * wrbmp.c
 *
 * Copyright (C) 1994-1996, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains routines to write output images in Microsoft "BMP"
 * format (MS Windows 3.x and OS/2 1.x flavors).
 * Either 8-bit colormapped or 24-bit full-color format can be written.
 * No compression is supported.
 *
 * These routines may need modification for non-Unix environments or
 * specialized applications.  As they stand, they assume output to
 * an ordinary stdio stream.
 *
 * This code contributed by James Arthur Boucher.
 */

//#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */

//#ifdef BMP_SUPPORTED


/*
 * To support 12-bit JPEG data, we'd have to scale output down to 8 bits.
 * This is not yet implemented.
 */

#if BITS_IN_JSAMPLE != 8
  Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
#endif

/*
 * Since BMP stores scanlines bottom-to-top, we have to invert the image
 * from JPEG's top-to-bottom order.  To do this, we save the outgoing data
 * in a virtual array during put_pixel_row calls, then actually emit the
 * BMP file during finish_output.  The virtual array contains one JSAMPLE per
 * pixel if the output is grayscale or colormapped, three if it is full color.
 */

/* Private version of data destination object */

typedef struct {
  struct djpeg_dest_struct pub;	/* public fields */

  boolean is_os2;		/* saves the OS2 format request flag */

  jvirt_sarray_ptr whole_image;	/* needed to reverse row order */
  JDIMENSION data_width;	/* JSAMPLEs per row */
  JDIMENSION row_width;		/* physical width of one row in the BMP file */
  int pad_bytes;		/* number of padding bytes needed per row */
  JDIMENSION cur_output_row;	/* next row# to write to virtual array */
} bmp_dest_struct;

typedef bmp_dest_struct * bmp_dest_ptr;


/* Forward declarations */
LOCAL(void) write_colormap
	JPP((j_decompress_ptr cinfo, bmp_dest_ptr dest,
	     int map_colors, int map_entry_size));

#define CHUNK_SIZE (1024L * 300)

inline
LOCAL(void)
my_putc (unsigned char ch, bmp_dest_ptr dest)
{
#if 0
	if (dest->pub.bitmap == NULL)
	{
		dest->pub.bmOffset = 0;
		dest->pub.bmSize = CHUNK_SIZE;
		dest->pub.bitmap = Platform::AllocateMemory (dest->pub.bmSize);
	}
	else if (dest->pub.bmOffset == dest->pub.bmSize)
	{
		dest->pub.bmSize += CHUNK_SIZE;
		dest->pub.bitmap = Platform::ReallocMemory (dest->pub.bitmap, dest->pub.bmSize);
	}
#endif

	unsigned char* p = ((unsigned char*) dest->pub.bitmap) + dest->pub.bmOffset++;
	*p = ch;
}

LOCAL(void)
my_write (bmp_dest_ptr dest, const void* src, size_t src_len)
{
	const unsigned char*	s = (const unsigned char*) src;

#if 0
	if ((dest->pub.bitmap == NULL) || ((dest->pub.bmOffset + src_len) >= dest->pub.bmSize))
	{
		while (src_len--)
			my_putc (*s++, dest);
	}
	else
#endif
	{
		unsigned char* p = ((unsigned char*) dest->pub.bitmap) + dest->pub.bmOffset;
		memcpy (p, src, src_len);
		dest->pub.bmOffset += src_len;
	}
}


/*
 * Write some pixel data.
 * In this module rows_supplied will always be 1.
 */

METHODDEF(void)
put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
		JDIMENSION /*rows_supplied*/)
/* This version is for writing 24-bit pixels */
{
  bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
  JSAMPARRAY image_ptr;
  register JSAMPROW inptr, outptr;
  register JDIMENSION col;
  int pad;

  /* Access next row in virtual array */
  image_ptr = (*cinfo->mem->access_virt_sarray)
    ((j_common_ptr) cinfo, dest->whole_image,
     dest->cur_output_row, (JDIMENSION) 1, TRUE);
  dest->cur_output_row++;

  /* Transfer data.  Note destination values must be in BGR order
   * (even though Microsoft's own documents say the opposite).
   */
  inptr = dest->pub.buffer[0];
  outptr = image_ptr[0];
  for (col = cinfo->output_width; col > 0; col--) {
    outptr[2] = *inptr++;	/* can omit GETJSAMPLE() safely */
    outptr[1] = *inptr++;
    outptr[0] = *inptr++;
    outptr += 3;
  }

  /* Zero out the pad bytes. */
  pad = dest->pad_bytes;
  while (--pad >= 0)
    *outptr++ = 0;
}

#if 0
METHODDEF(void)
put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
	       JDIMENSION rows_supplied)
/* This version is for grayscale OR quantized color output */
{
  bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
  JSAMPARRAY image_ptr;
  register JSAMPROW inptr, outptr;
  register JDIMENSION col;
  int pad;

  /* Access next row in virtual array */
  image_ptr = (*cinfo->mem->access_virt_sarray)
    ((j_common_ptr) cinfo, dest->whole_image,
     dest->cur_output_row, (JDIMENSION) 1, TRUE);
  dest->cur_output_row++;

  /* Transfer data. */
  inptr = dest->pub.buffer[0];
  outptr = image_ptr[0];
  for (col = cinfo->output_width; col > 0; col--) {
    *outptr++ = *inptr++;	/* can omit GETJSAMPLE() safely */
  }

  /* Zero out the pad bytes. */
  pad = dest->pad_bytes;
  while (--pad >= 0)
    *outptr++ = 0;
}
#endif

/*
 * Startup: normally writes the file header.
 * In this module we may as well postpone everything until finish_output.
 */

METHODDEF(void)
start_output_bmp (j_decompress_ptr /*cinfo*/, djpeg_dest_ptr /*dinfo*/)
{
  /* no work here */
}


/*
 * Finish up at the end of the file.
 *
 * Here is where we really output the BMP file.
 *
 * First, routines to write the Windows and OS/2 variants of the file header.
 */

LOCAL(void)
write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest)
/* Write a Windows-style BMP file header, including colormap if needed */
{
  char bmpfileheader[14];
  char bmpinfoheader[40];
#define PUT_2B(array,offset,value)  \
	(array[offset] = (char) ((value) & 0xFF), \
	 array[offset+1] = (char) (((value) >> 8) & 0xFF))
#define PUT_4B(array,offset,value)  \
	(array[offset] = (char) ((value) & 0xFF), \
	 array[offset+1] = (char) (((value) >> 8) & 0xFF), \
	 array[offset+2] = (char) (((value) >> 16) & 0xFF), \
	 array[offset+3] = (char) (((value) >> 24) & 0xFF))
  uae_u32 headersize, bfSize;
  int bits_per_pixel, cmap_entries;

  /* Compute colormap size and total file size */
  if (cinfo->out_color_space == JCS_RGB) {
    if (cinfo->quantize_colors) {
      /* Colormapped RGB */
      bits_per_pixel = 8;
      cmap_entries = 256;
    } else {
      /* Unquantized, full color RGB */
      bits_per_pixel = 24;
      cmap_entries = 0;
    }
  } else {
    /* Grayscale output.  We need to fake a 256-entry colormap. */
    bits_per_pixel = 8;
    cmap_entries = 256;
  }
  /* File size */
  headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */
  bfSize = headersize + (uae_u32) dest->row_width * (uae_u32) cinfo->output_height;
  
  /* Set unused fields of header to 0 */
  MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
  MEMZERO(bmpinfoheader, SIZEOF(bmpinfoheader));

  /* Fill the file header */
  bmpfileheader[0] = 0x42;	/* first 2 bytes are ASCII 'B', 'M' */
  bmpfileheader[1] = 0x4D;
  PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */
  /* we leave bfReserved1 & bfReserved2 = 0 */
  PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */

  /* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */
  PUT_2B(bmpinfoheader, 0, 40);	/* biSize */
  PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */
  PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */
  PUT_2B(bmpinfoheader, 12, 1);	/* biPlanes - must be 1 */
  PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */
  /* we leave biCompression = 0, for none */
  /* we leave biSizeImage = 0; this is correct for uncompressed data */
  if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */
    PUT_4B(bmpinfoheader, 24, (uae_u32) (cinfo->X_density*100)); /* XPels/M */
    PUT_4B(bmpinfoheader, 28, (uae_u32) (cinfo->Y_density*100)); /* XPels/M */
  }
  PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */
  /* we leave biClrImportant = 0 */

//  if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
//    ERREXIT(cinfo, JERR_FILE_WRITE);
//  if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40)
//    ERREXIT(cinfo, JERR_FILE_WRITE);
//  my_write (dest, bmpfileheader, 14);
  my_write (dest, bmpinfoheader, 40);

  if (cmap_entries > 0)
    write_colormap(cinfo, dest, cmap_entries, 4);
}


#if 0
LOCAL(void)
write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest)
/* Write an OS2-style BMP file header, including colormap if needed */
{
  char bmpfileheader[14];
  char bmpcoreheader[12];
  uae_u32 headersize, bfSize;
  int bits_per_pixel, cmap_entries;

  /* Compute colormap size and total file size */
  if (cinfo->out_color_space == JCS_RGB) {
    if (cinfo->quantize_colors) {
      /* Colormapped RGB */
      bits_per_pixel = 8;
      cmap_entries = 256;
    } else {
      /* Unquantized, full color RGB */
      bits_per_pixel = 24;
      cmap_entries = 0;
    }
  } else {
    /* Grayscale output.  We need to fake a 256-entry colormap. */
    bits_per_pixel = 8;
    cmap_entries = 256;
  }
  /* File size */
  headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */
  bfSize = headersize + (uae_u32) dest->row_width * (uae_u32) cinfo->output_height;
  
  /* Set unused fields of header to 0 */
  MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
  MEMZERO(bmpcoreheader, SIZEOF(bmpcoreheader));

  /* Fill the file header */
  bmpfileheader[0] = 0x42;	/* first 2 bytes are ASCII 'B', 'M' */
  bmpfileheader[1] = 0x4D;
  PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */
  /* we leave bfReserved1 & bfReserved2 = 0 */
  PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */

  /* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */
  PUT_2B(bmpcoreheader, 0, 12);	/* bcSize */
  PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */
  PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */
  PUT_2B(bmpcoreheader, 8, 1);	/* bcPlanes - must be 1 */
  PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */

  if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
    ERREXIT(cinfo, JERR_FILE_WRITE);
  if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12)
    ERREXIT(cinfo, JERR_FILE_WRITE);

  if (cmap_entries > 0)
    write_colormap(cinfo, dest, cmap_entries, 3);
}
#endif


/*
 * Write the colormap.
 * Windows uses BGR0 map entries; OS/2 uses BGR entries.
 */

LOCAL(void)
write_colormap (j_decompress_ptr cinfo, bmp_dest_ptr dest,
		int map_colors, int map_entry_size)
{
  JSAMPARRAY colormap = cinfo->colormap;
  int num_colors = cinfo->actual_number_of_colors;
//  FILE * outfile = dest->pub.output_file;
  bmp_dest_ptr outfile = dest;
  int i;

  if (colormap != NULL) {
    if (cinfo->out_color_components == 3) {
      /* Normal case with RGB colormap */
      for (i = 0; i < num_colors; i++) {
	my_putc(GETJSAMPLE(colormap[2][i]), outfile);
	my_putc(GETJSAMPLE(colormap[1][i]), outfile);
	my_putc(GETJSAMPLE(colormap[0][i]), outfile);
	if (map_entry_size == 4)
	  my_putc(0, outfile);
      }
    } else {
      /* Grayscale colormap (only happens with grayscale quantization) */
      for (i = 0; i < num_colors; i++) {
	my_putc(GETJSAMPLE(colormap[0][i]), outfile);
	my_putc(GETJSAMPLE(colormap[0][i]), outfile);
	my_putc(GETJSAMPLE(colormap[0][i]), outfile);
	if (map_entry_size == 4)
	  my_putc(0, outfile);
      }
    }
  } else {
    /* If no colormap, must be grayscale data.  Generate a linear "map". */
    for (i = 0; i < 256; i++) {
      my_putc(i, outfile);
      my_putc(i, outfile);
      my_putc(i, outfile);
      if (map_entry_size == 4)
	my_putc(0, outfile);
    }
  }
  /* Pad colormap with zeros to ensure specified number of colormap entries */ 
  if (i > map_colors)
    ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, i);
  for (; i < map_colors; i++) {
    my_putc(0, outfile);
    my_putc(0, outfile);
    my_putc(0, outfile);
    if (map_entry_size == 4)
      my_putc(0, outfile);
  }
}


METHODDEF(void)
finish_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
{
  bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
//  register FILE * outfile = dest->pub.output_file;
  bmp_dest_ptr outfile = dest;
  JSAMPARRAY image_ptr;
  register JSAMPROW data_ptr;
  JDIMENSION row;
  register JDIMENSION col;
  cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;

  /* Write the header and colormap */
//  if (dest->is_os2)
//    write_os2_header(cinfo, dest);
//  else
    write_bmp_header(cinfo, dest);

  /* Write the file body from our virtual array */
  for (row = cinfo->output_height; row > 0; row--) {
    if (progress != NULL) {
      progress->pub.pass_counter = (long) (cinfo->output_height - row);
      progress->pub.pass_limit = (long) cinfo->output_height;
      (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
    }
    image_ptr = (*cinfo->mem->access_virt_sarray)
      ((j_common_ptr) cinfo, dest->whole_image, row-1, (JDIMENSION) 1, FALSE);
    data_ptr = image_ptr[0];
    for (col = dest->row_width; col > 0; col--) {
      my_putc(GETJSAMPLE(*data_ptr), outfile);
      data_ptr++;
    }
  }
  if (progress != NULL)
    progress->completed_extra_passes++;

  /* Make sure we wrote the output file OK */
//  fflush(outfile);
//  if (ferror(outfile))
//    ERREXIT(cinfo, JERR_FILE_WRITE);
}


/*
 * The module selection routine for BMP format output.
 */

GLOBAL(djpeg_dest_ptr)
jinit_write_bmp (j_decompress_ptr cinfo, boolean is_os2)
{
  bmp_dest_ptr dest;
  JDIMENSION row_width;

  /* Create module interface object, fill in method pointers */
  dest = (bmp_dest_ptr)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
				  SIZEOF(bmp_dest_struct));
  dest->pub.start_output = start_output_bmp;
  dest->pub.finish_output = finish_output_bmp;
  dest->is_os2 = is_os2;

//  if (cinfo->out_color_space == JCS_GRAYSCALE) {
//    dest->pub.put_pixel_rows = put_gray_rows;
//  } else if (cinfo->out_color_space == JCS_RGB) {
//    if (cinfo->quantize_colors)
//      dest->pub.put_pixel_rows = put_gray_rows;
//    else
      dest->pub.put_pixel_rows = put_pixel_rows;
//  } else {
//    ERREXIT(cinfo, JERR_BMP_COLORSPACE);
//  }

  /* Calculate output image dimensions so we can allocate space */
  jpeg_calc_output_dimensions(cinfo);

  /* Determine width of rows in the BMP file (padded to 4-byte boundary). */
  row_width = cinfo->output_width * cinfo->output_components;
  dest->data_width = row_width;
  while ((row_width & 3) != 0) row_width++;
  dest->row_width = row_width;
  dest->pad_bytes = (int) (row_width - dest->data_width);

  /* Allocate space for inversion array, prepare for write pass */
  dest->whole_image = (*cinfo->mem->request_virt_sarray)
    ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
     row_width, cinfo->output_height, (JDIMENSION) 1);
  dest->cur_output_row = 0;
  if (cinfo->progress != NULL) {
    cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
    progress->total_extra_passes++; /* count file input as separate pass */
  }

  /* Create decompressor output buffer. */
  dest->pub.buffer = (*cinfo->mem->alloc_sarray)
    ((j_common_ptr) cinfo, JPOOL_IMAGE, row_width, (JDIMENSION) 1);
  dest->pub.buffer_height = 1;


		dest->pub.bmOffset = 0;
		dest->pub.bmSize = dest->row_width * cinfo->output_height;
#ifdef macintosh
//		dest->pub.bmSize = dest->pub.bmSize * 4 / 3;
#endif
		dest->pub.bmSize += 100;
		dest->pub.bitmap = Platform::AllocateMemory (dest->pub.bmSize);


  return (djpeg_dest_ptr) dest;
}

// #endif /* BMP_SUPPORTED */


// ========== Cribbed from djpeg.c ==========

/* Create the add-on message string table. */

#define JMESSAGE(code,string)	string ,

static const char * const cdjpeg_message_table[] = {
#include "cderror.h"
  NULL
};


void* JpegToDib (const void* image, long imageLen)
{
	// Modelled after main() in djpeg.c.

	struct jpeg_decompress_struct	cinfo;
	struct jpeg_error_mgr			jerr;
	djpeg_dest_ptr					dest_mgr = NULL;
	JDIMENSION						num_scanlines;

	/* Initialize the JPEG decompression object with default error handling. */
	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_decompress(&cinfo);

	/* Add some application-specific error messages (from cderror.h) */
	jerr.addon_message_table = cdjpeg_message_table;
	jerr.first_addon_message = JMSG_FIRSTADDONCODE;
	jerr.last_addon_message = JMSG_LASTADDONCODE;

	/* Specify data source for decompression */
//	jpeg_stdio_src(&cinfo, input_file);
	jpeg_mem_src(&cinfo, (const JOCTET*) image, (size_t) imageLen);

	/* Read file header, set default decompression parameters */
	(void) jpeg_read_header(&cinfo, TRUE);

	/* Initialize the output module now to let it override any crucial
	 * option settings (for instance, GIF wants to force color quantization).
	 */
	dest_mgr = jinit_write_bmp(&cinfo, FALSE);
//	dest_mgr->output_file = output_file;

	/* Start decompressor */
	(void) jpeg_start_decompress(&cinfo);

	/* Write output file header */
	(*dest_mgr->start_output) (&cinfo, dest_mgr);

	/* Process data */
	while (cinfo.output_scanline < cinfo.output_height)
	{
		num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
										dest_mgr->buffer_height);
		(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
	}

	/* Finish decompression and release memory.
	 * I must do it in this order because output module has allocated memory
	 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
	 */
	(*dest_mgr->finish_output) (&cinfo, dest_mgr);
	void* result = dest_mgr->bitmap;	// Snarf this before destroy leaks it.
	(void) jpeg_finish_decompress(&cinfo);
	jpeg_destroy_decompress(&cinfo);

	return result;
}