files/Source/FreeImage/PluginIFF.cpp - free_image - Git at Google

 // ==========================================================
 // Deluxe Paint Loader
 //
 // Design and implementation by
 // - Floris van den Berg (flvdberg@wxs.nl)
 // - Mark Sibly (marksibly@blitzbasic.com)
 // - Aaron Shumate (trek@startreker.com)
 // - Hervé 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"

 // ----------------------------------------------------------
 //  Internal typedefs and structures
 // ----------------------------------------------------------

 #ifdef _WIN32
 #pragma pack(push, 1)
 #else
 #pragma pack(1)
 #endif

 typedef struct {
     WORD w, h;                    /* raster width & height in pixels */
     WORD x, y;                    /* position for this image */
     BYTE nPlanes;                 /* # source bitplanes */
     BYTE masking;                 /* masking technique */
     BYTE compression;             /* compression algorithm */
     BYTE pad1;                    /* UNUSED.  For consistency, put 0 here.*/
     WORD transparentColor;        /* transparent "color number" */
     BYTE xAspect, yAspect;        /* aspect ratio, a rational number x/y */
     WORD pageWidth, pageHeight;   /* source "page" size in pixels */
 } BMHD;

 #ifdef _WIN32
 #pragma pack(pop)
 #else
 #pragma pack()
 #endif

 #ifndef FREEIMAGE_BIGENDIAN
 static void
 SwapHeader(BMHD *header) {
 	SwapShort(&header->w);
 	SwapShort(&header->h);
 	SwapShort(&header->x);
 	SwapShort(&header->y);
 	SwapShort(&header->transparentColor);
 	SwapShort(&header->pageWidth);
 	SwapShort(&header->pageHeight);
 }
 #endif

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

 /* IFF chunk IDs */

 typedef DWORD IFF_ID;

 #define MAKE_ID(a, b, c, d)         ((IFF_ID)(a)<<24 | (IFF_ID)(b)<<16 | (IFF_ID)(c)<<8 | (IFF_ID)(d))

 #define ID_FORM     MAKE_ID('F', 'O', 'R', 'M')     /* EA IFF 85 group identifier */
 #define ID_CAT      MAKE_ID('C', 'A', 'T', ' ')     /* EA IFF 85 group identifier */
 #define ID_LIST     MAKE_ID('L', 'I', 'S', 'T')     /* EA IFF 85 group identifier */
 #define ID_PROP     MAKE_ID('P', 'R', 'O', 'P')     /* EA IFF 85 group identifier */
 #define ID_END      MAKE_ID('E', 'N', 'D', ' ')     /* unofficial END-of-FORM identifier (see Amiga RKM Devices Ed.3 page 376) */

 #define ID_ILBM     MAKE_ID('I', 'L', 'B', 'M')     /* EA IFF 85 raster bitmap form */
 #define ID_DEEP     MAKE_ID('D', 'E', 'E', 'P')     /* Chunky pixel image files (Used in TV Paint) */
 #define ID_RGB8     MAKE_ID('R', 'G', 'B', '8')     /* RGB image forms, Turbo Silver (Impulse) */
 #define ID_RGBN     MAKE_ID('R', 'G', 'B', 'N')     /* RGB image forms, Turbo Silver (Impulse) */
 #define ID_PBM      MAKE_ID('P', 'B', 'M', ' ')     /* 256-color chunky format (DPaint 2 ?) */
 #define ID_ACBM     MAKE_ID('A', 'C', 'B', 'M')     /* Amiga Contiguous Bitmap (AmigaBasic) */
 /* generic */
 #define ID_FVER     MAKE_ID('F', 'V', 'E', 'R')     /* AmigaOS version string */
 #define ID_JUNK     MAKE_ID('J', 'U', 'N', 'K')     /* always ignore this chunk */
 #define ID_ANNO     MAKE_ID('A', 'N', 'N', 'O')     /* EA IFF 85 Generic Annotation chunk */
 #define ID_AUTH     MAKE_ID('A', 'U', 'T', 'H')     /* EA IFF 85 Generic Author chunk */
 #define ID_CHRS     MAKE_ID('C', 'H', 'R', 'S')     /* EA IFF 85 Generic character string chunk */
 #define ID_NAME     MAKE_ID('N', 'A', 'M', 'E')     /* EA IFF 85 Generic Name of art, music, etc. chunk */
 #define ID_TEXT     MAKE_ID('T', 'E', 'X', 'T')     /* EA IFF 85 Generic unformatted ASCII text chunk */
 #define ID_copy     MAKE_ID('(', 'c', ')', ' ')     /* EA IFF 85 Generic Copyright text chunk */
 /* ILBM chunks */
 #define ID_BMHD     MAKE_ID('B', 'M', 'H', 'D')     /* ILBM BitmapHeader */
 #define ID_CMAP     MAKE_ID('C', 'M', 'A', 'P')     /* ILBM 8bit RGB colormap */
 #define ID_GRAB     MAKE_ID('G', 'R', 'A', 'B')     /* ILBM "hotspot" coordiantes */
 #define ID_DEST     MAKE_ID('D', 'E', 'S', 'T')     /* ILBM destination image info */
 #define ID_SPRT     MAKE_ID('S', 'P', 'R', 'T')     /* ILBM sprite identifier */
 #define ID_CAMG     MAKE_ID('C', 'A', 'M', 'G')     /* Amiga viewportmodes */
 #define ID_BODY     MAKE_ID('B', 'O', 'D', 'Y')     /* ILBM image data */
 #define ID_CRNG     MAKE_ID('C', 'R', 'N', 'G')     /* color cycling */
 #define ID_CCRT     MAKE_ID('C', 'C', 'R', 'T')     /* color cycling */
 #define ID_CLUT     MAKE_ID('C', 'L', 'U', 'T')     /* Color Lookup Table chunk */
 #define ID_DPI      MAKE_ID('D', 'P', 'I', ' ')     /* Dots per inch chunk */
 #define ID_DPPV     MAKE_ID('D', 'P', 'P', 'V')     /* DPaint perspective chunk (EA) */
 #define ID_DRNG     MAKE_ID('D', 'R', 'N', 'G')     /* DPaint IV enhanced color cycle chunk (EA) */
 #define ID_EPSF     MAKE_ID('E', 'P', 'S', 'F')     /* Encapsulated Postscript chunk */
 #define ID_CMYK     MAKE_ID('C', 'M', 'Y', 'K')     /* Cyan, Magenta, Yellow, & Black color map (Soft-Logik) */
 #define ID_CNAM     MAKE_ID('C', 'N', 'A', 'M')     /* Color naming chunk (Soft-Logik) */
 #define ID_PCHG     MAKE_ID('P', 'C', 'H', 'G')     /* Line by line palette control information (Sebastiano Vigna) */
 #define ID_PRVW     MAKE_ID('P', 'R', 'V', 'W')     /* A mini duplicate ILBM used for preview (Gary Bonham) */
 #define ID_XBMI     MAKE_ID('X', 'B', 'M', 'I')     /* eXtended BitMap Information (Soft-Logik) */
 #define ID_CTBL     MAKE_ID('C', 'T', 'B', 'L')     /* Newtek Dynamic Ham color chunk */
 #define ID_DYCP     MAKE_ID('D', 'Y', 'C', 'P')     /* Newtek Dynamic Ham chunk */
 #define ID_SHAM     MAKE_ID('S', 'H', 'A', 'M')     /* Sliced HAM color chunk */
 #define ID_ABIT     MAKE_ID('A', 'B', 'I', 'T')     /* ACBM body chunk */
 #define ID_DCOL     MAKE_ID('D', 'C', 'O', 'L')     /* unofficial direct color */

 // ==========================================================
 // Plugin Interface
 // ==========================================================

 static int s_format_id;

 // ==========================================================
 // Plugin Implementation
 // ==========================================================

 static const char * DLL_CALLCONV
 Format() {
 	return "IFF";
 }

 static const char * DLL_CALLCONV
 Description() {
 	return "IFF Interleaved Bitmap";
 }

 static const char * DLL_CALLCONV
 Extension() {
 	return "iff,lbm";
 }

 static const char * DLL_CALLCONV
 RegExpr() {
 	return NULL;
 }

 static const char * DLL_CALLCONV
 MimeType() {
 	return "image/x-iff";
 }

 static BOOL DLL_CALLCONV
 Validate(FreeImageIO *io, fi_handle handle) {
 	DWORD type = 0;

 	// read chunk type
 	io->read_proc(&type, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 	SwapLong(&type);
 #endif

 	if(type != ID_FORM)
 		return FALSE;

 	// skip 4 bytes
 	io->read_proc(&type, 4, 1, handle);

 	// read chunk type
 	io->read_proc(&type, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 	SwapLong(&type);
 #endif

 	// File format : ID_PBM = Packed Bitmap, ID_ILBM = Interleaved Bitmap
 	return (type == ID_ILBM) || (type == ID_PBM);
 }


 static BOOL DLL_CALLCONV
 SupportsExportDepth(int depth) {
 	return FALSE;
 }

 static BOOL DLL_CALLCONV
 SupportsExportType(FREE_IMAGE_TYPE type) {
 	return FALSE;
 }

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

 static FIBITMAP * DLL_CALLCONV
 Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
 	if (handle != NULL) {
 		FIBITMAP *dib = NULL;

 		DWORD type, size;

 		io->read_proc(&type, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 		SwapLong(&type);
 #endif

 		if(type != ID_FORM)
 			return NULL;

 		io->read_proc(&size, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 		SwapLong(&size);
 #endif

 		io->read_proc(&type, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 		SwapLong(&type);
 #endif

 		if((type != ID_ILBM) && (type != ID_PBM))
 			return NULL;

 		size -= 4;

 		unsigned width = 0, height = 0, planes = 0, depth = 0, comp = 0;

 		while (size) {
 			DWORD ch_type,ch_size;

 			io->read_proc(&ch_type, 4, 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 			SwapLong(&ch_type);
 #endif

 			io->read_proc(&ch_size,4,1,handle );
 #ifndef FREEIMAGE_BIGENDIAN
 			SwapLong(&ch_size);
 #endif

 			unsigned ch_end = io->tell_proc(handle) + ch_size;

 			if (ch_type == ID_BMHD) {			// Bitmap Header
 				if (dib)
 					FreeImage_Unload(dib);

 				BMHD bmhd;

 				io->read_proc(&bmhd, sizeof(bmhd), 1, handle);
 #ifndef FREEIMAGE_BIGENDIAN
 				SwapHeader(&bmhd);
 #endif

 				width = bmhd.w;
 				height = bmhd.h;
 				planes = bmhd.nPlanes;
 				comp = bmhd.compression;

 				if(bmhd.masking & 1)
 					planes++;	// there is a mask ( 'stencil' )

 				if (planes > 8 && planes != 24)
 					return NULL;

 				depth = planes > 8 ? 24 : 8;

 				if( depth == 24 ) {
 					dib = FreeImage_Allocate(width, height, depth, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
 				} else {
 					dib = FreeImage_Allocate(width, height, depth);
 				}
 			} else if (ch_type == ID_CMAP) {	// Palette (Color Map)
 				if (!dib)
 					return NULL;

 				RGBQUAD *pal = FreeImage_GetPalette(dib);
 				if(pal != NULL) {
 					unsigned palette_entries = MIN((unsigned)ch_size / 3, FreeImage_GetColorsUsed(dib));
 					for (unsigned k = 0; k < palette_entries; k++) {
 						io->read_proc(&pal[k].rgbRed, 1, 1, handle );
 						io->read_proc(&pal[k].rgbGreen, 1, 1, handle );
 						io->read_proc(&pal[k].rgbBlue, 1, 1, handle );
 					}
 				}
 			} else if (ch_type == ID_BODY) {
 				if (!dib)
 					return NULL;

 				if (type == ID_PBM) {
 					// NON INTERLACED (LBM)

 					unsigned line = FreeImage_GetLine(dib) + 1 & ~1;

 					for (unsigned i = 0; i < FreeImage_GetHeight(dib); i++) {
 						BYTE *bits = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - i - 1);

 						if (comp == 1) {
 							// use RLE compression

 							DWORD number_of_bytes_written = 0;
 							BYTE rle_count;
 							BYTE byte;

 							while (number_of_bytes_written < line) {
 								io->read_proc(&rle_count, 1, 1, handle);

 								if (rle_count < 128) {
 									for (int k = 0; k < rle_count + 1; k++) {
 										io->read_proc(&byte, 1, 1, handle);

 										bits[number_of_bytes_written++] += byte;
 									}
 								} else if (rle_count > 128) {
 									io->read_proc(&byte, 1, 1, handle);

 									for (int k = 0; k < 257 - rle_count; k++) {
 										bits[number_of_bytes_written++] += byte;
 									}
 								}
 							}
 						} else {
 							// don't use compression

 							io->read_proc(bits, line, 1, handle);
 						}
 					}

 					return dib;
 				} else {
 					// INTERLACED (ILBM)

 					unsigned pixel_size = depth/8;
 					unsigned n_width=(width+15)&~15;
 					unsigned plane_size = n_width/8;
 					unsigned src_size = plane_size * planes;
 					BYTE *src = (BYTE*)malloc(src_size);
 					BYTE *dest = FreeImage_GetBits(dib);

 					dest += FreeImage_GetPitch(dib) * height;

 					for (unsigned y = 0; y < height; y++) {
 						dest -= FreeImage_GetPitch(dib);

 						// read all planes in one hit,
 						// 'coz PSP compresses across planes...

 						if (comp) {
 							// unpacker algorithm

 							for(unsigned x = 0; x < src_size;) {
 								// read the next source byte into t
 								signed char t = 0;
 								io->read_proc(&t, 1, 1, handle);

 								if (t >= 0) {
 									// t = [0..127] => copy the next t+1 bytes literally
 									unsigned size_to_read = t + 1;

 									if((size_to_read + x) > src_size) {
 										// sanity check for buffer overruns
 										size_to_read = src_size - x;
 										io->read_proc(src + x, size_to_read, 1, handle);
 										x += (t + 1);
 									} else {
 										io->read_proc(src + x, size_to_read, 1, handle);
 										x += size_to_read;
 									}
 								} else if (t != -128) {
 									// t = [-1..-127]  => replicate the next byte -t+1 times
 									BYTE b = 0;
 									io->read_proc(&b, 1, 1, handle);
 									unsigned size_to_copy = (unsigned)(-(int)t + 1);

 									if((size_to_copy + x) > src_size) {
 										// sanity check for buffer overruns
 										size_to_copy = src_size - x;
 										memset(src + x, b, size_to_copy);
 										x += (unsigned)(-(int)t + 1);
 									} else {
 										memset(src + x, b, size_to_copy);
 										x += size_to_copy;
 									}
 								}
 								// t = -128 => noop
 							}
 						} else {
 							io->read_proc(src, src_size, 1, handle);
 						}

 						// lazy planar->chunky...

 						for (unsigned x = 0; x < width; x++) {
 							for (unsigned n = 0; n < planes; n++) {
 								BYTE bit = (BYTE)( src[n * plane_size + (x / 8)] >> ((x^7) & 7) );

 								dest[x * pixel_size + (n / 8)] |= (bit & 1) << (n & 7);
 							}
 						}

 #if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
 						if (depth == 24) {
 							for (unsigned x = 0; x < width; ++x){
 								INPLACESWAP(dest[x * 3], dest[x * 3 + 2]);
 							}
 						}
 #endif
 					}

 					free(src);

 					return dib;
 				}
 			}

 			// Every odd-length chunk is followed by a 0 pad byte.  This pad
 			//  byte is not counted in ch_size.
 			if (ch_size & 1) {
 				ch_size++;
 				ch_end++;
 			}

 			io->seek_proc(handle, ch_end - io->tell_proc(handle), SEEK_CUR);

 			size -= ch_size + 8;
 		}

 		if (dib)
 			FreeImage_Unload(dib);
 	}

 	return 0;
 }

 // ==========================================================
 //   Init
 // ==========================================================

 void DLL_CALLCONV
 InitIFF(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 = NULL;
 	plugin->close_proc = NULL;
 	plugin->pagecount_proc = NULL;
 	plugin->pagecapability_proc = NULL;
 	plugin->load_proc = Load;
 	plugin->save_proc = NULL;
 	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 = NULL;
 }
	// ==========================================================
	// Deluxe Paint Loader
	//
	// Design and implementation by
	// - Floris van den Berg (flvdberg@wxs.nl)
	// - Mark Sibly (marksibly@blitzbasic.com)
	// - Aaron Shumate (trek@startreker.com)
	// - Hervé 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"

	// ----------------------------------------------------------
	// Internal typedefs and structures
	// ----------------------------------------------------------

	#ifdef _WIN32
	#pragma pack(push, 1)
	#else
	#pragma pack(1)
	#endif

	typedef struct {
	WORD w, h; /* raster width & height in pixels */
	WORD x, y; /* position for this image */
	BYTE nPlanes; /* # source bitplanes */
	BYTE masking; /* masking technique */
	BYTE compression; /* compression algorithm */
	BYTE pad1; /* UNUSED. For consistency, put 0 here.*/
	WORD transparentColor; /* transparent "color number" */
	BYTE xAspect, yAspect; /* aspect ratio, a rational number x/y */
	WORD pageWidth, pageHeight; /* source "page" size in pixels */
	} BMHD;

	#ifdef _WIN32
	#pragma pack(pop)
	#else
	#pragma pack()
	#endif

	#ifndef FREEIMAGE_BIGENDIAN
	static void
	SwapHeader(BMHD *header) {
	SwapShort(&header->w);
	SwapShort(&header->h);
	SwapShort(&header->x);
	SwapShort(&header->y);
	SwapShort(&header->transparentColor);
	SwapShort(&header->pageWidth);
	SwapShort(&header->pageHeight);
	}
	#endif

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

	/* IFF chunk IDs */

	typedef DWORD IFF_ID;

	#define MAKE_ID(a, b, c, d) ((IFF_ID)(a)<<24 \| (IFF_ID)(b)<<16 \| (IFF_ID)(c)<<8 \| (IFF_ID)(d))

	#define ID_FORM MAKE_ID('F', 'O', 'R', 'M') /* EA IFF 85 group identifier */
	#define ID_CAT MAKE_ID('C', 'A', 'T', ' ') /* EA IFF 85 group identifier */
	#define ID_LIST MAKE_ID('L', 'I', 'S', 'T') /* EA IFF 85 group identifier */
	#define ID_PROP MAKE_ID('P', 'R', 'O', 'P') /* EA IFF 85 group identifier */
	#define ID_END MAKE_ID('E', 'N', 'D', ' ') /* unofficial END-of-FORM identifier (see Amiga RKM Devices Ed.3 page 376) */

	#define ID_ILBM MAKE_ID('I', 'L', 'B', 'M') /* EA IFF 85 raster bitmap form */
	#define ID_DEEP MAKE_ID('D', 'E', 'E', 'P') /* Chunky pixel image files (Used in TV Paint) */
	#define ID_RGB8 MAKE_ID('R', 'G', 'B', '8') /* RGB image forms, Turbo Silver (Impulse) */
	#define ID_RGBN MAKE_ID('R', 'G', 'B', 'N') /* RGB image forms, Turbo Silver (Impulse) */
	#define ID_PBM MAKE_ID('P', 'B', 'M', ' ') /* 256-color chunky format (DPaint 2 ?) */
	#define ID_ACBM MAKE_ID('A', 'C', 'B', 'M') /* Amiga Contiguous Bitmap (AmigaBasic) */
	/* generic */
	#define ID_FVER MAKE_ID('F', 'V', 'E', 'R') /* AmigaOS version string */
	#define ID_JUNK MAKE_ID('J', 'U', 'N', 'K') /* always ignore this chunk */
	#define ID_ANNO MAKE_ID('A', 'N', 'N', 'O') /* EA IFF 85 Generic Annotation chunk */
	#define ID_AUTH MAKE_ID('A', 'U', 'T', 'H') /* EA IFF 85 Generic Author chunk */
	#define ID_CHRS MAKE_ID('C', 'H', 'R', 'S') /* EA IFF 85 Generic character string chunk */
	#define ID_NAME MAKE_ID('N', 'A', 'M', 'E') /* EA IFF 85 Generic Name of art, music, etc. chunk */
	#define ID_TEXT MAKE_ID('T', 'E', 'X', 'T') /* EA IFF 85 Generic unformatted ASCII text chunk */
	#define ID_copy MAKE_ID('(', 'c', ')', ' ') /* EA IFF 85 Generic Copyright text chunk */
	/* ILBM chunks */
	#define ID_BMHD MAKE_ID('B', 'M', 'H', 'D') /* ILBM BitmapHeader */
	#define ID_CMAP MAKE_ID('C', 'M', 'A', 'P') /* ILBM 8bit RGB colormap */
	#define ID_GRAB MAKE_ID('G', 'R', 'A', 'B') /* ILBM "hotspot" coordiantes */
	#define ID_DEST MAKE_ID('D', 'E', 'S', 'T') /* ILBM destination image info */
	#define ID_SPRT MAKE_ID('S', 'P', 'R', 'T') /* ILBM sprite identifier */
	#define ID_CAMG MAKE_ID('C', 'A', 'M', 'G') /* Amiga viewportmodes */
	#define ID_BODY MAKE_ID('B', 'O', 'D', 'Y') /* ILBM image data */
	#define ID_CRNG MAKE_ID('C', 'R', 'N', 'G') /* color cycling */
	#define ID_CCRT MAKE_ID('C', 'C', 'R', 'T') /* color cycling */
	#define ID_CLUT MAKE_ID('C', 'L', 'U', 'T') /* Color Lookup Table chunk */
	#define ID_DPI MAKE_ID('D', 'P', 'I', ' ') /* Dots per inch chunk */
	#define ID_DPPV MAKE_ID('D', 'P', 'P', 'V') /* DPaint perspective chunk (EA) */
	#define ID_DRNG MAKE_ID('D', 'R', 'N', 'G') /* DPaint IV enhanced color cycle chunk (EA) */
	#define ID_EPSF MAKE_ID('E', 'P', 'S', 'F') /* Encapsulated Postscript chunk */
	#define ID_CMYK MAKE_ID('C', 'M', 'Y', 'K') /* Cyan, Magenta, Yellow, & Black color map (Soft-Logik) */
	#define ID_CNAM MAKE_ID('C', 'N', 'A', 'M') /* Color naming chunk (Soft-Logik) */
	#define ID_PCHG MAKE_ID('P', 'C', 'H', 'G') /* Line by line palette control information (Sebastiano Vigna) */
	#define ID_PRVW MAKE_ID('P', 'R', 'V', 'W') /* A mini duplicate ILBM used for preview (Gary Bonham) */
	#define ID_XBMI MAKE_ID('X', 'B', 'M', 'I') /* eXtended BitMap Information (Soft-Logik) */
	#define ID_CTBL MAKE_ID('C', 'T', 'B', 'L') /* Newtek Dynamic Ham color chunk */
	#define ID_DYCP MAKE_ID('D', 'Y', 'C', 'P') /* Newtek Dynamic Ham chunk */
	#define ID_SHAM MAKE_ID('S', 'H', 'A', 'M') /* Sliced HAM color chunk */
	#define ID_ABIT MAKE_ID('A', 'B', 'I', 'T') /* ACBM body chunk */
	#define ID_DCOL MAKE_ID('D', 'C', 'O', 'L') /* unofficial direct color */

	// ==========================================================
	// Plugin Interface
	// ==========================================================

	static int s_format_id;

	// ==========================================================
	// Plugin Implementation
	// ==========================================================

	static const char * DLL_CALLCONV
	Format() {
	return "IFF";
	}

	static const char * DLL_CALLCONV
	Description() {
	return "IFF Interleaved Bitmap";
	}

	static const char * DLL_CALLCONV
	Extension() {
	return "iff,lbm";
	}

	static const char * DLL_CALLCONV
	RegExpr() {
	return NULL;
	}

	static const char * DLL_CALLCONV
	MimeType() {
	return "image/x-iff";
	}

	static BOOL DLL_CALLCONV
	Validate(FreeImageIO *io, fi_handle handle) {
	DWORD type = 0;

	// read chunk type
	io->read_proc(&type, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&type);
	#endif

	if(type != ID_FORM)
	return FALSE;

	// skip 4 bytes
	io->read_proc(&type, 4, 1, handle);

	// read chunk type
	io->read_proc(&type, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&type);
	#endif

	// File format : ID_PBM = Packed Bitmap, ID_ILBM = Interleaved Bitmap
	return (type == ID_ILBM) \|\| (type == ID_PBM);
	}


	static BOOL DLL_CALLCONV
	SupportsExportDepth(int depth) {
	return FALSE;
	}

	static BOOL DLL_CALLCONV
	SupportsExportType(FREE_IMAGE_TYPE type) {
	return FALSE;
	}

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

	static FIBITMAP * DLL_CALLCONV
	Load(FreeImageIO io, fi_handle handle, int page, int flags, void data) {
	if (handle != NULL) {
	FIBITMAP *dib = NULL;

	DWORD type, size;

	io->read_proc(&type, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&type);
	#endif

	if(type != ID_FORM)
	return NULL;

	io->read_proc(&size, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&size);
	#endif

	io->read_proc(&type, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&type);
	#endif

	if((type != ID_ILBM) && (type != ID_PBM))
	return NULL;

	size -= 4;

	unsigned width = 0, height = 0, planes = 0, depth = 0, comp = 0;

	while (size) {
	DWORD ch_type,ch_size;

	io->read_proc(&ch_type, 4, 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&ch_type);
	#endif

	io->read_proc(&ch_size,4,1,handle );
	#ifndef FREEIMAGE_BIGENDIAN
	SwapLong(&ch_size);
	#endif

	unsigned ch_end = io->tell_proc(handle) + ch_size;

	if (ch_type == ID_BMHD) { // Bitmap Header
	if (dib)
	FreeImage_Unload(dib);

	BMHD bmhd;

	io->read_proc(&bmhd, sizeof(bmhd), 1, handle);
	#ifndef FREEIMAGE_BIGENDIAN
	SwapHeader(&bmhd);
	#endif

	width = bmhd.w;
	height = bmhd.h;
	planes = bmhd.nPlanes;
	comp = bmhd.compression;

	if(bmhd.masking & 1)
	planes++; // there is a mask ( 'stencil' )

	if (planes > 8 && planes != 24)
	return NULL;

	depth = planes > 8 ? 24 : 8;

	if( depth == 24 ) {
	dib = FreeImage_Allocate(width, height, depth, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
	} else {
	dib = FreeImage_Allocate(width, height, depth);
	}
	} else if (ch_type == ID_CMAP) { // Palette (Color Map)
	if (!dib)
	return NULL;

	RGBQUAD *pal = FreeImage_GetPalette(dib);
	if(pal != NULL) {
	unsigned palette_entries = MIN((unsigned)ch_size / 3, FreeImage_GetColorsUsed(dib));
	for (unsigned k = 0; k < palette_entries; k++) {
	io->read_proc(&pal[k].rgbRed, 1, 1, handle );
	io->read_proc(&pal[k].rgbGreen, 1, 1, handle );
	io->read_proc(&pal[k].rgbBlue, 1, 1, handle );
	}
	}
	} else if (ch_type == ID_BODY) {
	if (!dib)
	return NULL;

	if (type == ID_PBM) {
	// NON INTERLACED (LBM)

	unsigned line = FreeImage_GetLine(dib) + 1 & ~1;

	for (unsigned i = 0; i < FreeImage_GetHeight(dib); i++) {
	BYTE *bits = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - i - 1);

	if (comp == 1) {
	// use RLE compression

	DWORD number_of_bytes_written = 0;
	BYTE rle_count;
	BYTE byte;

	while (number_of_bytes_written < line) {
	io->read_proc(&rle_count, 1, 1, handle);

	if (rle_count < 128) {
	for (int k = 0; k < rle_count + 1; k++) {
	io->read_proc(&byte, 1, 1, handle);

	bits[number_of_bytes_written++] += byte;
	}
	} else if (rle_count > 128) {
	io->read_proc(&byte, 1, 1, handle);

	for (int k = 0; k < 257 - rle_count; k++) {
	bits[number_of_bytes_written++] += byte;
	}
	}
	}
	} else {
	// don't use compression

	io->read_proc(bits, line, 1, handle);
	}
	}

	return dib;
	} else {
	// INTERLACED (ILBM)

	unsigned pixel_size = depth/8;
	unsigned n_width=(width+15)&~15;
	unsigned plane_size = n_width/8;
	unsigned src_size = plane_size * planes;
	BYTE src = (BYTE)malloc(src_size);
	BYTE *dest = FreeImage_GetBits(dib);

	dest += FreeImage_GetPitch(dib) * height;

	for (unsigned y = 0; y < height; y++) {
	dest -= FreeImage_GetPitch(dib);

	// read all planes in one hit,
	// 'coz PSP compresses across planes...

	if (comp) {
	// unpacker algorithm

	for(unsigned x = 0; x < src_size;) {
	// read the next source byte into t
	signed char t = 0;
	io->read_proc(&t, 1, 1, handle);

	if (t >= 0) {
	// t = [0..127] => copy the next t+1 bytes literally
	unsigned size_to_read = t + 1;

	if((size_to_read + x) > src_size) {
	// sanity check for buffer overruns
	size_to_read = src_size - x;
	io->read_proc(src + x, size_to_read, 1, handle);
	x += (t + 1);
	} else {
	io->read_proc(src + x, size_to_read, 1, handle);
	x += size_to_read;
	}
	} else if (t != -128) {
	// t = [-1..-127] => replicate the next byte -t+1 times
	BYTE b = 0;
	io->read_proc(&b, 1, 1, handle);
	unsigned size_to_copy = (unsigned)(-(int)t + 1);

	if((size_to_copy + x) > src_size) {
	// sanity check for buffer overruns
	size_to_copy = src_size - x;
	memset(src + x, b, size_to_copy);
	x += (unsigned)(-(int)t + 1);
	} else {
	memset(src + x, b, size_to_copy);
	x += size_to_copy;
	}
	}
	// t = -128 => noop
	}
	} else {
	io->read_proc(src, src_size, 1, handle);
	}

	// lazy planar->chunky...

	for (unsigned x = 0; x < width; x++) {
	for (unsigned n = 0; n < planes; n++) {
	BYTE bit = (BYTE)( src[n * plane_size + (x / 8)] >> ((x^7) & 7) );

	dest[x * pixel_size + (n / 8)] \|= (bit & 1) << (n & 7);
	}
	}

	#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
	if (depth == 24) {
	for (unsigned x = 0; x < width; ++x){
	INPLACESWAP(dest[x * 3], dest[x * 3 + 2]);
	}
	}
	#endif
	}

	free(src);

	return dib;
	}
	}

	// Every odd-length chunk is followed by a 0 pad byte. This pad
	// byte is not counted in ch_size.
	if (ch_size & 1) {
	ch_size++;
	ch_end++;
	}

	io->seek_proc(handle, ch_end - io->tell_proc(handle), SEEK_CUR);

	size -= ch_size + 8;
	}

	if (dib)
	FreeImage_Unload(dib);
	}

	return 0;
	}

	// ==========================================================
	// Init
	// ==========================================================

	void DLL_CALLCONV
	InitIFF(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 = NULL;
	plugin->close_proc = NULL;
	plugin->pagecount_proc = NULL;
	plugin->pagecapability_proc = NULL;
	plugin->load_proc = Load;
	plugin->save_proc = NULL;
	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 = NULL;
	}