/*
 * Project:  libtiff tools
 * Purpose:  Convert Windows BMP files in TIFF.
 * Author:   Andrey Kiselev, dron@ak4719.spb.edu
 *
 ******************************************************************************
 * Copyright (c) 2004, Andrey Kiselev <dron@ak4719.spb.edu>
 *
 * 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 <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

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

#if HAVE_FCNTL_H
#include <fcntl.h>
#endif

#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#if HAVE_IO_H
#include <io.h>
#endif

#ifdef NEED_LIBPORT
#include "libport.h"
#endif

#include "tiffio.h"
#include "tiffiop.h"

#ifndef O_BINARY
#define O_BINARY 0
#endif

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 compressed, 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_t iCIEX;
    int32_t iCIEY;
    int32_t 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_t 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_t iReserved1; /* Reserved, set as 0 */
    uint16_t iReserved2; /* Reserved, set as 0 */
    uint32_t iOffBits;   /* Offset of the image from file start in bytes */
} BMPFileHeader;

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

typedef struct
{
    uint32_t iSize;         /* Size of BMPInfoHeader structure in bytes.
                             * Should be used to determine start of the
                             * colour table */
    int32_t iWidth;         /* Image width */
    int32_t iHeight;        /* Image height. If positive, image has bottom
                             * left origin, if negative --- top left. */
    int16_t iPlanes;        /* Number of image planes (must be set to 1) */
    int16_t 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_t iCompression;  /* Compression method */
    uint32_t 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_t iXPelsPerMeter; /* X resolution, pixels per meter (0 if not used) */
    int32_t iYPelsPerMeter; /* Y resolution, pixels per meter (0 if not used) */
    uint32_t iClrUsed;      /* Size of colour table. If 0, iBitCount should
                             * be used to calculate this value
                             * (1<<iBitCount). This value should be
                             * unsigned for proper shifting. */
    int32_t 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_t iRedMask;           /* Colour mask that specifies the red component
                                 * of each pixel, valid only if iCompression
                                 * is set to BI_BITFIELDS. */
    int32_t iGreenMask;         /* The same for green component */
    int32_t iBlueMask;          /* The same for blue component */
    int32_t iAlphaMask;         /* Colour mask that specifies the alpha
                                 * component of each pixel. */
    uint32_t iCSType;           /* Colour space of the DIB. */
    BMPCIEXYZTriple sEndpoints; /* This member is ignored unless the iCSType
                                 * member specifies BMPLT_CALIBRATED_RGB. */
    int32_t 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_t iGammaGreen;        /* Toned response curve for green. */
    int32_t 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_t compression = (uint16_t)-1;
static int jpegcolormode = JPEGCOLORMODE_RGB;
static int quality = 75; /* JPEG quality */
static uint16_t predictor = 0;

static void usage(void);
static int processCompressOptions(char *);
static void rearrangePixels(char *, uint32_t, uint32_t);

int main(int argc, char *argv[])
{
    uint32_t width, length;
    uint16_t nbands = 1; /* number of bands in input image */
    uint16_t depth = 8;  /* bits per pixel in input image */
    uint32_t rowsperstrip = (uint32_t)-1;
    uint16_t photometric = PHOTOMETRIC_MINISBLACK;
    int fd = 0;
    _TIFF_stat_s instat;
    char *outfilename = NULL, *infilename = NULL;
    TIFF *out = NULL;

    BMPFileHeader file_hdr;
    BMPInfoHeader info_hdr;
    int bmp_type;
    uint32_t clr_tbl_size, n_clr_elems = 3;
    unsigned char *clr_tbl;
    unsigned short *red_tbl = NULL, *green_tbl = NULL, *blue_tbl = NULL;
    uint32_t row, clr;

    int c;
#if !HAVE_DECL_OPTARG
    extern int optind;
    extern char *optarg;
#endif

    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();

    if (outfilename == NULL)
        outfilename = argv[argc - 1];
    out = TIFFOpen(outfilename, "w");
    if (out == NULL)
    {
        TIFFError(infilename, "Cannot open file %s for output", outfilename);
        goto bad3;
    }

    while (optind < argc - 1)
    {
        infilename = argv[optind];
        optind++;

        fd = open(infilename, O_RDONLY | O_BINARY, 0);
        if (fd < 0)
        {
            TIFFError(infilename, "Cannot open input file");
            return -1;
        }

        if (read(fd, file_hdr.bType, 2) != 2)
        {
            TIFFError(infilename, "Failed to read from file (%s)",
                      strerror(errno));
            goto bad;
        }
        if (file_hdr.bType[0] != 'B' || file_hdr.bType[1] != 'M')
        {
            TIFFError(infilename, "File is not BMP");
            goto bad;
        }

        /* --------------------------------------------------------------------
         */
        /*      Read the BMPFileHeader. We need iOffBits value only */
        /* --------------------------------------------------------------------
         */
        if (_TIFF_lseek_f(fd, 10, SEEK_SET) == (_TIFF_off_t)-1)
        {
            TIFFError(infilename, "Failed to seek to offset");
            goto bad;
        }
        if (read(fd, &file_hdr.iOffBits, 4) != 4)
        {
            TIFFError(infilename, "Failed to read from file (%s)",
                      strerror(errno));
            goto bad;
        }
#ifdef WORDS_BIGENDIAN
        TIFFSwabLong(&file_hdr.iOffBits);
#endif
        if (_TIFF_fstat_f(fd, &instat) == -1)
        {
            TIFFError(infilename, "Failed obtain file information");
            goto bad;
        }
        file_hdr.iSize = instat.st_size;

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

        if (_TIFF_lseek_f(fd, BFH_SIZE, SEEK_SET) == (_TIFF_off_t)-1)
        {
            TIFFError(infilename, "Failed to seek to offset");
            goto bad;
        }
        if (read(fd, &info_hdr.iSize, 4) != 4)
        {
            TIFFError(infilename, "Failed to read from file (%s)",
                      strerror(errno));
            goto bad;
        }
#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)
        {
            if ((read(fd, &info_hdr.iWidth, 4) != 4) ||
                (read(fd, &info_hdr.iHeight, 4) != 4) ||
                (read(fd, &info_hdr.iPlanes, 2) != 2) ||
                (read(fd, &info_hdr.iBitCount, 2) != 2) ||
                (read(fd, &info_hdr.iCompression, 4) != 4) ||
                (read(fd, &info_hdr.iSizeImage, 4) != 4) ||
                (read(fd, &info_hdr.iXPelsPerMeter, 4) != 4) ||
                (read(fd, &info_hdr.iYPelsPerMeter, 4) != 4) ||
                (read(fd, &info_hdr.iClrUsed, 4) != 4) ||
                (read(fd, &info_hdr.iClrImportant, 4) != 4))
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
#ifdef WORDS_BIGENDIAN
            TIFFSwabLong((uint32_t *)&info_hdr.iWidth);
            TIFFSwabLong((uint32_t *)&info_hdr.iHeight);
            TIFFSwabShort((uint16_t *)&info_hdr.iPlanes);
            TIFFSwabShort((uint16_t *)&info_hdr.iBitCount);
            TIFFSwabLong((uint32_t *)&info_hdr.iCompression);
            TIFFSwabLong((uint32_t *)&info_hdr.iSizeImage);
            TIFFSwabLong((uint32_t *)&info_hdr.iXPelsPerMeter);
            TIFFSwabLong((uint32_t *)&info_hdr.iYPelsPerMeter);
            TIFFSwabLong((uint32_t *)&info_hdr.iClrUsed);
            TIFFSwabLong((uint32_t *)&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_t iShort;

            if (read(fd, &iShort, 2) != 2)
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
#ifdef WORDS_BIGENDIAN
            TIFFSwabShort((uint16_t *)&iShort);
#endif
            info_hdr.iWidth = iShort;
            if (read(fd, &iShort, 2) != 2)
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
#ifdef WORDS_BIGENDIAN
            TIFFSwabShort((uint16_t *)&iShort);
#endif
            info_hdr.iHeight = iShort;
            if (read(fd, &iShort, 2) != 2)
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
#ifdef WORDS_BIGENDIAN
            TIFFSwabShort((uint16_t *)&iShort);
#endif
            info_hdr.iPlanes = iShort;
            if (read(fd, &iShort, 2) != 2)
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
#ifdef WORDS_BIGENDIAN
            TIFFSwabShort((uint16_t *)&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)
        {
            TIFFError(infilename, "Cannot process BMP file with bit count %d",
                      info_hdr.iBitCount);
            close(fd);
            return 0;
        }

        width = info_hdr.iWidth;
        length = (info_hdr.iHeight > 0) ? info_hdr.iHeight : -info_hdr.iHeight;
        if (width <= 0 || length <= 0)
        {
            TIFFError(infilename, "Invalid dimensions of BMP file");
            close(fd);
            return -1;
        }

        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 = ((uint32_t)(1 << depth) < info_hdr.iClrUsed)
                                       ? (uint32_t)(1 << depth)
                                       : info_hdr.iClrUsed;
                else
                    clr_tbl_size = 1 << depth;
                clr_tbl =
                    (unsigned char *)_TIFFmalloc(n_clr_elems * clr_tbl_size);
                if (!clr_tbl)
                {
                    TIFFError(infilename,
                              "Can't allocate space for color table");
                    goto bad;
                }

                if (_TIFF_lseek_f(fd, BFH_SIZE + info_hdr.iSize, SEEK_SET) ==
                    (_TIFF_off_t)-1)
                {
                    TIFFError(infilename, "Failed to seek to offset");
                    goto bad;
                }
                if (read(fd, clr_tbl, n_clr_elems * clr_tbl_size) !=
                    (long)(n_clr_elems * clr_tbl_size))
                {
                    TIFFError(infilename, "Failed to read from file (%s)",
                              strerror(errno));
                    goto bad;
                }

                red_tbl = (unsigned short *)_TIFFmalloc(
                    ((tmsize_t)1) << depth * sizeof(unsigned short));
                if (!red_tbl)
                {
                    TIFFError(infilename,
                              "Can't allocate space for red component table");
                    _TIFFfree(clr_tbl);
                    goto bad1;
                }
                green_tbl = (unsigned short *)_TIFFmalloc(
                    ((tmsize_t)1) << depth * sizeof(unsigned short));
                if (!green_tbl)
                {
                    TIFFError(infilename,
                              "Can't allocate space for green component table");
                    _TIFFfree(clr_tbl);
                    goto bad2;
                }
                blue_tbl = (unsigned short *)_TIFFmalloc(
                    ((tmsize_t)1) << depth * sizeof(unsigned short));
                if (!blue_tbl)
                {
                    TIFFError(infilename,
                              "Can't allocate space for blue component table");
                    _TIFFfree(clr_tbl);
                    goto bad3;
                }

                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. */
        /* --------------------------------------------------------------------
         */

        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_t)-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_ADOBE_DEFLATE:
            case COMPRESSION_DEFLATE:
                if (predictor != 0)
                    TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
                break;
        }

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

        if (info_hdr.iCompression == BMPC_RGB)
        {
            uint32_t offset, size;
            char *scanbuf;

            /* XXX: Avoid integer overflow. We can calculate size
             * in one step using
             *
             *  size = ((width * info_hdr.iBitCount + 31) & ~31) / 8
             *
             * formulae, but we should check for overflow
             * conditions during calculation.
             */
            size = width * info_hdr.iBitCount + 31;
            if (!width || !info_hdr.iBitCount ||
                (size - 31) / info_hdr.iBitCount != width)
            {
                TIFFError(infilename, "Wrong image parameters; can't "
                                      "allocate space for scanline buffer");
                goto bad3;
            }
            size = (size & ~31) / 8;

            scanbuf = (char *)_TIFFmalloc(size);
            if (!scanbuf)
            {
                TIFFError(infilename,
                          "Can't allocate space for scanline buffer");
                goto bad3;
            }

            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 (_TIFF_lseek_f(fd, offset, SEEK_SET) == (_TIFF_off_t)-1)
                {
                    TIFFError(infilename, "scanline %lu: Seek error",
                              (unsigned long)row);
                    break;
                }

                if (read(fd, scanbuf, size) != (long)size)
                {
                    TIFFError(infilename, "scanline %lu: Read error",
                              (unsigned long)row);
                    break;
                }

                rearrangePixels(scanbuf, width, info_hdr.iBitCount);

                if (TIFFWriteScanline(out, scanbuf, row, 0) < 0)
                {
                    TIFFError(infilename, "scanline %lu: Write error",
                              (unsigned long)row);
                    break;
                }
            }

            _TIFFfree(scanbuf);

            /* --------------------------------------------------------------------
             */
            /*  Read compressed image data. */
            /* --------------------------------------------------------------------
             */
        }
        else if (info_hdr.iCompression == BMPC_RLE8 ||
                 info_hdr.iCompression == BMPC_RLE4)
        {
            uint32_t i, j, k, runlength;
            uint32_t compr_size, uncompr_size;
            unsigned char *comprbuf;
            unsigned char *uncomprbuf;

            compr_size = file_hdr.iSize - file_hdr.iOffBits;
            uncompr_size = width * length;
            /* Detect int overflow */
            if (uncompr_size / width != length)
            {
                TIFFError(infilename, "Invalid dimensions of BMP file");
                close(fd);
                return -1;
            }
            if ((compr_size == 0) || (compr_size > ((uint32_t)~0) >> 1) ||
                (uncompr_size == 0) || (uncompr_size > ((uint32_t)~0) >> 1))
            {
                TIFFError(infilename, "Invalid dimensions of BMP file");
                close(fd);
                return -1;
            }
            comprbuf = (unsigned char *)_TIFFmalloc(compr_size);
            if (!comprbuf)
            {
                TIFFError(
                    infilename,
                    "Can't allocate space for compressed scanline buffer");
                goto bad3;
            }
            uncomprbuf = (unsigned char *)_TIFFmalloc(uncompr_size);
            if (!uncomprbuf)
            {
                TIFFError(
                    infilename,
                    "Can't allocate space for uncompressed scanline buffer");
                goto bad3;
            }

            if (_TIFF_lseek_f(fd, file_hdr.iOffBits, SEEK_SET) ==
                (_TIFF_off_t)-1)
            {
                TIFFError(infilename, "Failed to seek to offset");
                goto bad3;
            }
            if (read(fd, comprbuf, compr_size) != (long)compr_size)
            {
                TIFFError(infilename, "Failed to read from file (%s)",
                          strerror(errno));
                goto bad;
            }
            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)
                {
                    TIFFError(infilename, "scanline %lu: Write error.\n",
                              (unsigned long)row);
                }
            }

            _TIFFfree(uncomprbuf);
        }
        TIFFWriteDirectory(out);
        if (blue_tbl)
        {
            _TIFFfree(blue_tbl);
            blue_tbl = NULL;
        }
        if (green_tbl)
        {
            _TIFFfree(green_tbl);
            green_tbl = NULL;
        }
        if (red_tbl)
        {
            _TIFFfree(red_tbl);
            red_tbl = NULL;
        }
    }

bad3:
    if (blue_tbl)
        _TIFFfree(blue_tbl);
bad2:
    if (green_tbl)
        _TIFFfree(green_tbl);
bad1:
    if (red_tbl)
        _TIFFfree(red_tbl);
bad:
    close(fd);

    if (out)
        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_t width, uint32_t bit_count)
{
    char tmp;
    uint32_t 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, ':');

        compression = COMPRESSION_JPEG;
        while (cp)
        {
            if (isdigit((int)cp[1]))
                quality = atoi(cp + 1);
            else if (cp[1] == 'r')
                jpegcolormode = JPEGCOLORMODE_RAW;
            else
                usage();

            cp = strchr(cp + 1, ':');
        }
    }
    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_ADOBE_DEFLATE;
    }
    else
        return (0);
    return (1);
}

static char *stuff[] = {
    "bmp2tiff --- convert Windows BMP files to TIFF",
    "usage: bmp2tiff [options] input.bmp [input2.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);
}