/* $Id: bmp2tiff.c,v 1.8 2004-09-21 12:16:51 dron Exp $
 *
 * Project:  libtiff tools
 * Purpose:  Convert Windows BMP files in TIFF.
 * Author:   Andrey Kiselev, dron@remotesensing.org
 *
 ******************************************************************************
 * Copyright (c) 2004, Andrey Kiselev <dron@remotesensing.org>
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

#include "tif_config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#include "tiffio.h"

enum BMPType
{
    BMPT_WIN4,      /* BMP used in Windows 3.0/NT 3.51/95 */
    BMPT_WIN5,      /* BMP used in Windows NT 4.0/98/Me/2000/XP */
    BMPT_OS21,      /* BMP used in OS/2 PM 1.x */
    BMPT_OS22       /* BMP used in OS/2 PM 2.x */
};

/*
 * Bitmap file consists of a BMPFileHeader structure followed by a
 * BMPInfoHeader structure. An array of BMPColorEntry structures (also called
 * a colour table) follows the bitmap information header structure. The colour
 * table is followed by a second array of indexes into the colour table (the
 * actual bitmap data). Data may be comressed, for 4-bpp and 8-bpp used RLE
 * compression.
 *
 * +---------------------+
 * | BMPFileHeader       |
 * +---------------------+
 * | BMPInfoHeader       |
 * +---------------------+
 * | BMPColorEntry array |
 * +---------------------+
 * | Colour-index array  |
 * +---------------------+
 *
 * All numbers stored in Intel order with least significant byte first.
 */

enum BMPComprMethod
{
    BMPC_RGB = 0L,          /* Uncompressed */
    BMPC_RLE8 = 1L,         /* RLE for 8 bpp images */
    BMPC_RLE4 = 2L,         /* RLE for 4 bpp images */
    BMPC_BITFIELDS = 3L,    /* Bitmap is not compressed and the colour table
			     * consists of three DWORD color masks that specify
			     * the red, green, and blue components of each
			     * pixel. This is valid when used with
			     * 16- and 32-bpp bitmaps. */
    BMPC_JPEG = 4L,         /* Indicates that the image is a JPEG image. */
    BMPC_PNG = 5L           /* Indicates that the image is a PNG image. */
};

enum BMPLCSType                 /* Type of logical color space. */
{
    BMPLT_CALIBRATED_RGB = 0,	/* This value indicates that endpoints and
				 * gamma values are given in the appropriate
				 * fields. */
    BMPLT_DEVICE_RGB = 1,
    BMPLT_DEVICE_CMYK = 2
};

typedef struct
{
    int32   iCIEX;
    int32   iCIEY;
    int32   iCIEZ;
} BMPCIEXYZ;

typedef struct                  /* This structure contains the x, y, and z */
{				/* coordinates of the three colors that */
				/* correspond */
    BMPCIEXYZ   iCIERed;        /* to the red, green, and blue endpoints for */
    BMPCIEXYZ   iCIEGreen;      /* a specified logical color space. */
    BMPCIEXYZ	iCIEBlue;
} BMPCIEXYZTriple;

typedef struct
{
    char	bType[2];       /* Signature "BM" */
    uint32	iSize;          /* Size in bytes of the bitmap file. Should
				 * always be ignored while reading because
				 * of error in Windows 3.0 SDK's description
				 * of this field */
    uint16	iReserved1;     /* Reserved, set as 0 */
    uint16	iReserved2;     /* Reserved, set as 0 */
    uint32	iOffBits;       /* Offset of the image from file start in bytes */
} BMPFileHeader;

/* File header size in bytes: */
const int       BFH_SIZE = 14;

typedef struct
{
    uint32	iSize;          /* Size of BMPInfoHeader structure in bytes.
				 * Should be used to determine start of the
				 * colour table */
    int32	iWidth;         /* Image width */
    int32	iHeight;        /* Image height. If positive, image has bottom
				 * left origin, if negative --- top left. */
    int16	iPlanes;        /* Number of image planes (must be set to 1) */
    int16	iBitCount;      /* Number of bits per pixel (1, 4, 8, 16, 24
				 * or 32). If 0 then the number of bits per
				 * pixel is specified or is implied by the
				 * JPEG or PNG format. */
    uint32	iCompression;	/* Compression method */
    uint32	iSizeImage;     /* Size of uncomressed image in bytes. May
				 * be 0 for BMPC_RGB bitmaps. If iCompression
				 * is BI_JPEG or BI_PNG, iSizeImage indicates
				 * the size of the JPEG or PNG image buffer. */
    int32	iXPelsPerMeter; /* X resolution, pixels per meter (0 if not used) */
    int32	iYPelsPerMeter; /* Y resolution, pixels per meter (0 if not used) */
    int32	iClrUsed;       /* Size of colour table. If 0, iBitCount should
				 * be used to calculate this value
				 * (1<<iBitCount) */
    int32	iClrImportant;  /* Number of important colours. If 0, all
				 * colours are required */

    /*
     * Fields above should be used for bitmaps, compatible with Windows NT 3.51
     * and earlier. Windows 98/Me, Windows 2000/XP introduces additional fields:
     */

    int32	iRedMask;       /* Colour mask that specifies the red component
				 * of each pixel, valid only if iCompression
				 * is set to BI_BITFIELDS. */
    int32	iGreenMask;     /* The same for green component */
    int32	iBlueMask;      /* The same for blue component */
    int32	iAlphaMask;     /* Colour mask that specifies the alpha
				 * component of each pixel. */
    uint32	iCSType;        /* Colour space of the DIB. */
    BMPCIEXYZTriple sEndpoints; /* This member is ignored unless the iCSType
				 * member specifies BMPLT_CALIBRATED_RGB. */
    int32	iGammaRed;      /* Toned response curve for red. This member
				 * is ignored unless color values are
				 * calibrated RGB values and iCSType is set to
				 * BMPLT_CALIBRATED_RGB. Specified
				 * in 16^16 format. */
    int32	iGammaGreen;    /* Toned response curve for green. */
    int32	iGammaBlue;     /* Toned response curve for blue. */
} BMPInfoHeader;

/*
 * Info header size in bytes:
 */
const unsigned int  BIH_WIN4SIZE = 40; /* for BMPT_WIN4 */
const unsigned int  BIH_WIN5SIZE = 57; /* for BMPT_WIN5 */
const unsigned int  BIH_OS21SIZE = 12; /* for BMPT_OS21 */
const unsigned int  BIH_OS22SIZE = 64; /* for BMPT_OS22 */

/*
 * We will use plain byte array instead of this structure, but declaration
 * provided for reference
 */
typedef struct
{
    char       bBlue;
    char       bGreen;
    char       bRed;
    char       bReserved;      /* Must be 0 */
} BMPColorEntry;

static	uint16 compression = (uint16) -1;
static	int jpegcolormode = JPEGCOLORMODE_RGB;
static	int quality = 75;		/* JPEG quality */
static	uint16 predictor = 0;

static void usage(void);
static int processCompressOptions(char*);
static void rearrangePixels(char *, uint32, uint32);

int
main(int argc, char* argv[])
{
	uint32	width, length;
	uint32	nbands = 1;		/* number of bands in input image */
        int	depth = 8;		/* bits per pixel in input image */
	uint32	rowsperstrip = (uint32) -1;
        uint16	photometric = PHOTOMETRIC_MINISBLACK;
	FILE	*in;
	struct stat instat;
	char	*outfilename = NULL;
	TIFF	*out;

	BMPFileHeader file_hdr;
        BMPInfoHeader info_hdr;
        int     bmp_type;
        uint32  clr_tbl_size, n_clr_elems = 3;
        unsigned char *clr_tbl;
	unsigned short *red_tbl = NULL, *green_tbl = NULL, *blue_tbl = NULL;
	uint32	row, clr;

	int	c;
	extern int optind;
	extern char* optarg;

	while ((c = getopt(argc, argv, "c:r:o:h")) != -1) {
		switch (c) {
		case 'c':		/* compression scheme */
			if (!processCompressOptions(optarg))
				usage();
			break;
		case 'r':		/* rows/strip */
			rowsperstrip = atoi(optarg);
			break;
		case 'o':
			outfilename = optarg;
			break;
		case 'h':
			usage();
		default:
			break;
		}
	}

	if (argc - optind < 2)
		usage();

	in = fopen(argv[optind], "rb");
	if (in == NULL) {
		fprintf(stderr, "%s: %s: Cannot open input file.\n",
			argv[0], argv[optind]);
		return -1;
	}

	fread(file_hdr.bType, 1, 2, in);
	if(file_hdr.bType[0] != 'B' || file_hdr.bType[1] != 'M') {
	        fprintf(stderr, "%s: %s: File is not BMP.\n",
		        argv[0], argv[optind]);
	        fclose(in);
	        return 0;
	}

/* -------------------------------------------------------------------- */
/*      Read the BMPFileHeader. We need iOffBits value only             */
/* -------------------------------------------------------------------- */
	fseek(in, 10, SEEK_SET);
	fread(&file_hdr.iOffBits, 1, 4, in);
#ifdef WORDS_BIGENDIAN
        TIFFSwabLong(&file_hdr.iOffBits);
#endif
	stat(argv[optind], &instat);
	file_hdr.iSize = instat.st_size;

/* -------------------------------------------------------------------- */
/*      Read the BMPInfoHeader.                                         */
/* -------------------------------------------------------------------- */

        fseek(in, BFH_SIZE, SEEK_SET);
        fread(&info_hdr.iSize, 1, 4, in);
#ifdef WORDS_BIGENDIAN
        TIFFSwabLong(&info_hdr.iSize);
#endif

        if (info_hdr.iSize == BIH_WIN4SIZE)
                bmp_type = BMPT_WIN4;
        else if (info_hdr.iSize == BIH_OS21SIZE)
                bmp_type = BMPT_OS21;
        else if (info_hdr.iSize == BIH_OS22SIZE || info_hdr.iSize == 16)
                bmp_type = BMPT_OS22;
        else
                bmp_type = BMPT_WIN5;

        if (bmp_type == BMPT_WIN4 || bmp_type == BMPT_WIN5 || bmp_type == BMPT_OS22) {
                fread(&info_hdr.iWidth, 1, 4, in);
                fread(&info_hdr.iHeight, 1, 4, in);
                fread(&info_hdr.iPlanes, 1, 2, in);
                fread(&info_hdr.iBitCount, 1, 2, in);
                fread(&info_hdr.iCompression, 1, 4, in);
                fread(&info_hdr.iSizeImage, 1, 4, in);
                fread(&info_hdr.iXPelsPerMeter, 1, 4, in);
                fread(&info_hdr.iYPelsPerMeter, 1, 4, in);
                fread(&info_hdr.iClrUsed, 1, 4, in);
                fread(&info_hdr.iClrImportant, 1, 4, in);
#ifdef WORDS_BIGENDIAN
                TIFFSwabLong(&info_hdr.iWidth);
                TIFFSwabLong(&info_hdr.iHeight);
                TIFFSwabShort(&info_hdr.iPlanes);
                TIFFSwabShort(&info_hdr.iBitCount);
                TIFFSwabLong(&info_hdr.iCompression);
                TIFFSwabLong(&info_hdr.iSizeImage);
                TIFFSwabLong(&info_hdr.iXPelsPerMeter);
                TIFFSwabLong(&info_hdr.iYPelsPerMeter);
                TIFFSwabLong(&info_hdr.iClrUsed);
                TIFFSwabLong(&info_hdr.iClrImportant);
#endif
                n_clr_elems = 4;
        }

	if (bmp_type == BMPT_OS22) {
		/* 
		 * FIXME: different info in different documents
		 * regarding this!
		 */
                 n_clr_elems = 3;
        }

	if (bmp_type == BMPT_OS21) {
                int16  iShort;

                fread(&iShort, 1, 2, in);
#ifdef WORDS_BIGENDIAN
                TIFFSwabShort(&iShort);
#endif
                info_hdr.iWidth = iShort;
                fread(&iShort, 1, 2, in);
#ifdef WORDS_BIGENDIAN
                TIFFSwabShort(&iShort);
#endif
                info_hdr.iHeight = iShort;
                fread(&iShort, 1, 2, in);
#ifdef WORDS_BIGENDIAN
                TIFFSwabShort(&iShort);
#endif
                info_hdr.iPlanes = iShort;
                fread(&iShort, 1, 2, in);
#ifdef WORDS_BIGENDIAN
                TIFFSwabShort(&iShort);
#endif
                info_hdr.iBitCount = iShort;
		info_hdr.iCompression = BMPC_RGB;
                n_clr_elems = 3;
        }

        if (info_hdr.iBitCount != 1  && info_hdr.iBitCount != 4  &&
            info_hdr.iBitCount != 8  && info_hdr.iBitCount != 16 &&
            info_hdr.iBitCount != 24 && info_hdr.iBitCount != 32) {
            fprintf(stderr,
                    "%s: %s: Cannot process BMP file with bit count %d.\n",
                    argv[0], argv[optind], info_hdr.iBitCount);
            fclose(in);
            return 0;
        }

        width = info_hdr.iWidth;
        length = (info_hdr.iHeight > 0) ? info_hdr.iHeight : -info_hdr.iHeight;

	switch (info_hdr.iBitCount)
        {
                case 1:
                case 4:
                case 8:
                        nbands = 1;
			depth = info_hdr.iBitCount;
                        photometric = PHOTOMETRIC_PALETTE;
                        /* Allocate memory for colour table and read it. */
                        if (info_hdr.iClrUsed)
                            clr_tbl_size = (1 << depth < info_hdr.iClrUsed) ?
				    1 << depth : info_hdr.iClrUsed;
                        else
                            clr_tbl_size = 1 << depth;
                        clr_tbl = (unsigned char *)
				_TIFFmalloc(n_clr_elems * clr_tbl_size);

			fseek(in, BFH_SIZE + info_hdr.iSize, SEEK_SET);
                        fread(clr_tbl, n_clr_elems, clr_tbl_size, in);

			red_tbl = (unsigned short*)
				_TIFFmalloc(1<<depth * sizeof(unsigned short));
			green_tbl = (unsigned short*)
				_TIFFmalloc(1<<depth * sizeof(unsigned short));
			blue_tbl = (unsigned short*)
				_TIFFmalloc(1<<depth * sizeof(unsigned short));

                        for(clr = 0; clr < clr_tbl_size; clr++) {
                            red_tbl[clr] = 257 * clr_tbl[clr*n_clr_elems+2];
                            green_tbl[clr] = 257 * clr_tbl[clr*n_clr_elems+1];
                            blue_tbl[clr] = 257 * clr_tbl[clr*n_clr_elems];
                        }

                        _TIFFfree(clr_tbl);
                        break;
                case 16:
                case 24:
                        nbands = 3;
			depth = info_hdr.iBitCount / nbands;
                        photometric = PHOTOMETRIC_RGB;
                        break;
                case 32:
                        nbands = 3;
			depth = 8;
                        photometric = PHOTOMETRIC_RGB;
                        break;
                default:
                        break;
        }

/* -------------------------------------------------------------------- */
/*  Create output file.                                                 */
/* -------------------------------------------------------------------- */

	if (outfilename == NULL)
		outfilename = argv[optind+1];
	out = TIFFOpen(outfilename, "w");
	if (out == NULL) {
		fprintf(stderr, "%s: %s: Cannot open file for output.\n",
			argv[0], outfilename);
                fclose(in);
		return -1;
	}
	TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
	TIFFSetField(out, TIFFTAG_IMAGELENGTH, length);
	TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, nbands);
	TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, depth);
	TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
	TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photometric);
        TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
                     TIFFDefaultStripSize(out, rowsperstrip));
	
	if (red_tbl && green_tbl && blue_tbl)
		TIFFSetField(out, TIFFTAG_COLORMAP, red_tbl, green_tbl, blue_tbl);
	
	if (compression == (uint16) -1)
		compression = COMPRESSION_PACKBITS;
	TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
	switch (compression) {
	case COMPRESSION_JPEG:
		if (photometric == PHOTOMETRIC_RGB
		    && jpegcolormode == JPEGCOLORMODE_RGB)
			photometric = PHOTOMETRIC_YCBCR;
		TIFFSetField(out, TIFFTAG_JPEGQUALITY, quality);
		TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, jpegcolormode);
		break;
	case COMPRESSION_LZW:
	case COMPRESSION_DEFLATE:
		if (predictor != 0)
			TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
		break;
	}

/* -------------------------------------------------------------------- */
/*  Read uncompressed image data.                                       */
/* -------------------------------------------------------------------- */

        if (info_hdr.iCompression == BMPC_RGB) {
                uint32  offset, size;
                char *scanbuf;

                size = ((width * info_hdr.iBitCount + 31) & ~31) / 8;
                scanbuf = (char *) _TIFFmalloc(size);

                for (row = 0; row < length; row++) {
                        if (info_hdr.iHeight > 0)
                                offset = file_hdr.iOffBits + (length - row - 1) * size;
                        else
                                offset = file_hdr.iOffBits + row * size;
                        if (fseek(in, offset, SEEK_SET) == -1) {
				fprintf(stderr,
					"%s: %s: scanline %lu: Seek error.\n",
					argv[0], argv[optind],
					(unsigned long) row);
                        }

			if (fread(scanbuf, size, 1, in) != 1) {
				fprintf(stderr,
					"%s: %s: scanline %lu: Read error.\n",
					argv[0], argv[optind],
					(unsigned long) row);
                        }

                        rearrangePixels(scanbuf, width, info_hdr.iBitCount);

                        if (TIFFWriteScanline(out, scanbuf, row, 0) < 0) {
			        fprintf(stderr,
                                        "%s: %s: scanline %lu: Write error.\n",
				        argv[0], outfilename,
                                        (unsigned long) row);
                        }
                }

                _TIFFfree(scanbuf);

/* -------------------------------------------------------------------- */
/*  Read compressed image data.                                         */
/* -------------------------------------------------------------------- */

        } else if ( info_hdr.iCompression == BMPC_RLE8
		    || info_hdr.iCompression == BMPC_RLE4 ) {
		uint32		i, j, k, runlength;
		uint32		compr_size, uncompr_size;
		unsigned char   *comprbuf;
		unsigned char   *uncomprbuf;

		compr_size = file_hdr.iSize - file_hdr.iOffBits;
		uncompr_size = width * length;
		comprbuf = (unsigned char *) _TIFFmalloc( compr_size );
		uncomprbuf = (unsigned char *) _TIFFmalloc( uncompr_size );

		fseek(in, file_hdr.iOffBits, SEEK_SET);
		fread(comprbuf, 1, compr_size, in);
		i = 0;
		j = 0;
		if (info_hdr.iBitCount == 8) {		    /* RLE8 */
		    while( j < uncompr_size && i < compr_size ) {
			if ( comprbuf[i] ) {
			    runlength = comprbuf[i++];
			    while( runlength > 0
				   && j < uncompr_size
				   && i < compr_size ) {
				uncomprbuf[j++] = comprbuf[i];
				runlength--;
			    }
			    i++;
			} else {
			    i++;
			    if ( comprbuf[i] == 0 )         /* Next scanline */
				i++;
			    else if ( comprbuf[i] == 1 )    /* End of image */
				break;
			    else if ( comprbuf[i] == 2 ) {  /* Move to... */
				i++;
				if ( i < compr_size - 1 ) {
				    j += comprbuf[i] + comprbuf[i+1] * width;
				    i += 2;
				}
				else
				    break;
			    } else {                         /* Absolute mode */
				runlength = comprbuf[i++];
				for ( k = 0; k < runlength && j < uncompr_size && i < compr_size; k++ )
				    uncomprbuf[j++] = comprbuf[i++];
				if ( k & 0x01 )
				    i++;
			    }
			}
		    }
		}
		else {					    /* RLE4 */
		    while( j < uncompr_size && i < compr_size ) {
			if ( comprbuf[i] ) {
			    runlength = comprbuf[i++];
			    while( runlength > 0 && j < uncompr_size && i < compr_size ) {
				if ( runlength & 0x01 )
				    uncomprbuf[j++] = (comprbuf[i] & 0xF0) >> 4;
				else
				    uncomprbuf[j++] = comprbuf[i] & 0x0F;
				runlength--;
			    }
			    i++;
			} else {
			    i++;
			    if ( comprbuf[i] == 0 )         /* Next scanline */
				i++;
			    else if ( comprbuf[i] == 1 )    /* End of image */
				break;
			    else if ( comprbuf[i] == 2 ) {  /* Move to... */
				i++;
				if ( i < compr_size - 1 ) {
				    j += comprbuf[i] + comprbuf[i+1] * width;
				    i += 2;
				}
				else
				    break;
			    } else {                        /* Absolute mode */
				runlength = comprbuf[i++];
				for ( k = 0; k < runlength && j < uncompr_size && i < compr_size; k++) {
				    if ( k & 0x01 )
					uncomprbuf[j++] = comprbuf[i++] & 0x0F;
				    else
					uncomprbuf[j++] = (comprbuf[i] & 0xF0) >> 4;
				}
				if ( k & 0x01 )
				    i++;
			    }
			}
		    }
		}

		_TIFFfree(comprbuf);

		for (row = 0; row < length; row++) {
                        if (TIFFWriteScanline(out, uncomprbuf + (length - row - 1) * width, row, 0) < 0) {
			        fprintf(stderr,
                                        "%s: %s: scanline %lu: Write error.\n",
				        argv[0], outfilename,
                                        (unsigned long) row);
                        }
		}

		_TIFFfree(uncomprbuf);
 	}
	
	if (red_tbl && green_tbl && blue_tbl) {
		_TIFFfree(red_tbl);
		_TIFFfree(green_tbl);
		_TIFFfree(blue_tbl);
	}

        fclose(in);
        TIFFClose(out);
        return 0;
}

/*
 * Image data in BMP file stored in BGR (or ABGR) format. We should rearrange
 * pixels to RGB (RGBA) format.
 */
static void
rearrangePixels(char *buf, uint32 width, uint32 bit_count)
{
	char tmp;
	uint32 i;

        switch(bit_count) {
		case 16:    /* FIXME: need a sample file */
                        break;
                case 24:
			for (i = 0; i < width; i++, buf += 3) {
				tmp = *buf;
				*buf = *(buf + 2);
				*(buf + 2) = tmp;
			}
                        break;
                case 32:
			{
				char	*buf1 = buf;

				for (i = 0; i < width; i++, buf += 4) {
					tmp = *buf;
					*buf1++ = *(buf + 2);
					*buf1++ = *(buf + 1);
					*buf1++ = tmp;
				}
			}
                        break;
                default:
                        break;
        }
}

static int
processCompressOptions(char* opt)
{
	if (strcmp(opt, "none") == 0)
		compression = COMPRESSION_NONE;
	else if (strcmp(opt, "packbits") == 0)
		compression = COMPRESSION_PACKBITS;
	else if (strncmp(opt, "jpeg", 4) == 0) {
		char* cp = strchr(opt, ':');
		if (cp && isdigit((int)cp[1]))
			quality = atoi(cp+1);
		if (cp && strchr(cp, 'r'))
			jpegcolormode = JPEGCOLORMODE_RAW;
		compression = COMPRESSION_JPEG;
	} else if (strncmp(opt, "lzw", 3) == 0) {
		char* cp = strchr(opt, ':');
		if (cp)
			predictor = atoi(cp+1);
		compression = COMPRESSION_LZW;
	} else if (strncmp(opt, "zip", 3) == 0) {
		char* cp = strchr(opt, ':');
		if (cp)
			predictor = atoi(cp+1);
		compression = COMPRESSION_DEFLATE;
	} else
		return (0);
	return (1);
}

static char* stuff[] = {
"bmp2tiff --- tool for converting Windows BMP files in TIFF",
"usage: bmp2tiff [options] input.bmp output.tif",
"where options are:",
" -r #		make each strip have no more than # rows",
"",
" -c lzw[:opts]	compress output with Lempel-Ziv & Welch encoding",
" -c zip[:opts]	compress output with deflate encoding",
" -c jpeg[:opts]compress output with JPEG encoding",
" -c packbits	compress output with packbits encoding",
" -c none	use no compression algorithm on output",
"",
"JPEG options:",
" #		set compression quality level (0-100, default 75)",
" r		output color image as RGB rather than YCbCr",
"For example, -c jpeg:r:50 to get JPEG-encoded RGB data with 50% comp. quality",
"",
"LZW and deflate options:",
" #		set predictor value",
"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
" -o out.tif	write output to out.tif",
" -h		this help message",
NULL
};

static void
usage(void)
{
	char buf[BUFSIZ];
	int i;

	setbuf(stderr, buf);
        fprintf(stderr, "%s\n\n", TIFFGetVersion());
	for (i = 0; stuff[i] != NULL; i++)
		fprintf(stderr, "%s\n", stuff[i]);
	exit(-1);
}

/* vim: set ts=8 sts=8 sw=8 noet: */