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#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "compact.h"
#include "medcut.h"

#define DEF_BLACK       BlackPixel(Dpy, DefaultScreen(Dpy))
#define DEF_WHITE       WhitePixel(Dpy, DefaultScreen(Dpy))
#define	MAX_LINE	81


extern unsigned char *ReadGifBitmap();


extern Display *Dpy;

int NumColors;

char nibMask[8] = {
    1, 2, 4, 8, 16, 32, 64, 128
};



/*
 * dscan is a quick replacement for:
 *
 *    fscanf (fp, "%d", &ip);
 */
dscan(fp, ip)
FILE *fp;
int *ip;
{

    register int v = 0;
    register int n = 0;
    int done = 0;
    static int nerrors;

    while (!done) {
	register int i;
	i = getc(fp);
	if (i < 0) {
	    *ip = v;
	    fprintf(stderr, "dscanf: EOF");
	    if (nerrors++ > 2)
		return (-1);
	    else if (nerrors++ > 4)
		exit(-1);
	    return (n);
	}
	i &= 0xFF;
	switch (i) {
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	    v = i - '0' + (v * 10);
	    n++;
	    break;
	case '\n':
	case '\r':
	case ' ':
	case '\t':
	    if (n) {
		*ip = v;
		done = 1;
	    }
	    break;
	default:
	    fprintf(stderr, "dscanf: non numeric character (0x%x) '%c'\n", i, i);
	    if (nerrors++ > 4)
		exit(-1);
	    return (-1);

	}
    }
    return (n);
}


unsigned char *
ReadXpmPixmap(fp, w, h, colrs, Colors, CharsPP)
FILE *fp;
int *w, *h;
struct colr_data *colrs;
int Colors, CharsPP;
{
    unsigned char *pixels;
    char **Color_Vals;
    XColor tmpcolr;
    int i, j, k;
    int value, found;
    char line[BUFSIZ], name_and_type[MAX_LINE];
    unsigned char *dataP;
    unsigned char *bitp;
    int tchar;
    char *t;
    char *t2;

    NumColors = 256;
    if (Colors == 0) {
	fprintf(stderr, "Can't find Colors.\n");
	return ((unsigned char *) NULL);
    }
    if (*w == 0) {
	fprintf(stderr, "Invalid width.\n");
	return ((unsigned char *) NULL);
    }
    if (*h == 0) {
	fprintf(stderr, "Invalid height.\n");
	return ((unsigned char *) NULL);
    }

    Color_Vals = (char **) malloc(sizeof(char *) * Colors);
    for (i = 0; i < Colors; i++) {
	tchar = getc(fp);
	while ((tchar != '"') && (tchar != EOF)) {
	    tchar = getc(fp);
	}
	Color_Vals[i] = (char *) malloc(sizeof(char) * (CharsPP + 1));
	j = 0;
	tchar = getc(fp);
	while ((tchar != '"') && (tchar != EOF) && (j < CharsPP)) {
	    Color_Vals[i][j] = (char) tchar;
	    tchar = getc(fp);
	    j++;
	}
	Color_Vals[i][j] = '\0';
	if (tchar != '"') {
	    tchar = getc(fp);
	    while ((tchar != '"') && (tchar != EOF)) {
		tchar = getc(fp);
	    }
	}
	tchar = getc(fp);
	while ((tchar != '"') && (tchar != EOF)) {
	    tchar = getc(fp);
	}
	j = 0;
	tchar = getc(fp);
	while ((tchar != '"') && (tchar != EOF)) {
	    line[j] = (char) tchar;
	    tchar = getc(fp);
	    j++;
	}
	line[j] = '\0';
	XParseColor(Dpy, DefaultColormap(Dpy, DefaultScreen(Dpy)), line, &tmpcolr);
	colrs[i].red = tmpcolr.red;
	colrs[i].green = tmpcolr.green;
	colrs[i].blue = tmpcolr.blue;
    }
    for (i = Colors; i < 256; i++) {
	colrs[i].red = 0;
	colrs[i].green = 0;
	colrs[i].blue = 0;
    }
    tchar = getc(fp);
    while ((tchar != ';') && (tchar != EOF)) {
	tchar = getc(fp);
    }

    for (;;) {
	if (!(fgets(line, MAX_LINE, fp))) {
	    fprintf(stderr, "Can't find Pixels\n");
	    return ((unsigned char *) NULL);
	} else if (sscanf(line, "static char * %s = {", name_and_type) == 1) {
	    if ((t = (char *) rindex(name_and_type, '_')) == NULL) {
		t = name_and_type;
	    } else {
		t++;
	    }
	    if ((t2 = (char *) index(name_and_type, '[')) != NULL) {
		*t2 = '\0';
	    }
	    if (!strcmp("pixels", t)) {
		break;
	    }
	}
    }
    pixels = (unsigned char *) malloc((*w) * (*h));
    if (pixels == NULL) {
	fprintf(stderr, "Not enough memory for data.\n");
	return ((unsigned char *) NULL);
    }

    line[0] = '\0';
    t = line;
    dataP = pixels;
    tchar = getc(fp);
    while ((tchar != '"') && (tchar != EOF)) {
	tchar = getc(fp);
    }
    tchar = getc(fp);
    for (j = 0; j < (*h); j++) {
	for (i = 0; i < (*w); i++) {
	    k = 0;
	    while ((tchar != '"') && (tchar != EOF) && (k < CharsPP)) {
		line[k] = (char) tchar;
		tchar = getc(fp);
		k++;
	    }
	    if ((k == 0) && (tchar == '"')) {
		tchar = getc(fp);
		while ((tchar != '"') && (tchar != EOF)) {
		    tchar = getc(fp);
		}
		k = 0;
		tchar = getc(fp);
		while ((tchar != '"') && (tchar != EOF) && (k < CharsPP)) {
		    line[k] = (char) tchar;
		    tchar = getc(fp);
		    k++;
		}
	    }
	    line[k] = '\0';
	    found = 0;
	    for (k = 0; k < Colors; k++) {
		if (strncmp(Color_Vals[k], line, CharsPP) == 0) {
		    *dataP++ = (unsigned char) k;
		    found = 1;
		    break;
		}
	    }
	    if (found == 0) {
		fprintf(stderr, "Invalid Pixel (%2s) in file\n", line);
		*dataP++ = (unsigned char) 0;
	    }
	}
    }
    bitp = pixels;
    for (i = 0; i < ((*w) * (*h)); i++) {
	if ((int) *bitp > (256 - 1))
	    *bitp = (unsigned char) 0;
	bitp++;
    }
    for (i = 0; i < Colors; i++) {
	free((char *) Color_Vals[i]);
    }
    free((char *) Color_Vals);
    return (pixels);
}


unsigned char *
ReadXbmBitmap(fp, w, h, colrs)
FILE *fp;
int *w, *h;
struct colr_data *colrs;
{
    int blackbit = BlackPixel(Dpy, DefaultScreen(Dpy));
    int whitebit = WhitePixel(Dpy, DefaultScreen(Dpy));
    char line[MAX_LINE], name_and_type[MAX_LINE];
    char *t;
    char *t2;
    unsigned char *ptr, *dataP;
    int bytes_per_line, version10p, raster_length, padding;
    int i, bytes, temp, value;
    int Ncolors, charspp, xpmformat;

    *w = 0;
    *h = 0;
    Ncolors = 0;
    charspp = 0;
    xpmformat = 0;
    for (;;) {
	if (!(fgets(line, MAX_LINE, fp)))
	    break;
	if (strlen(line) == (MAX_LINE - 1)) {
	    fprintf(stderr, "Line too long.\n");
	    return ((unsigned char *) NULL);
	}
	if (sscanf(line, "#define %s %d", name_and_type, &value) == 2) {
	    if (!(t = (char *) rindex(name_and_type, '_')))
		t = name_and_type;
	    else
		t++;
	    if (!strcmp("width", t))
		*w = value;
	    if (!strcmp("height", t))
		*h = value;
	    if (!strcmp("ncolors", t))
		Ncolors = value;
	    if (!strcmp("pixel", t))
		charspp = value;
	    continue;
	}
	if (sscanf(line, "static short %s = {", name_and_type) == 1) {
	    version10p = 1;
	    break;
	} else if (sscanf(line, "static char * %s = {", name_and_type) == 1) {
	    xpmformat = 1;
	    if (!(t = (char *) rindex(name_and_type, '_')))
		t = name_and_type;
	    else
		t++;
	    if ((t2 = (char *) index(name_and_type, '[')) != NULL)
		*t2 = '\0';
	    if (!strcmp("mono", t))
		continue;
	    else
		break;
	} else if (sscanf(line, "static char %s = {", name_and_type) == 1) {
	    version10p = 0;
	    break;
	} else
	    continue;
    }
    if (xpmformat) {
	dataP = ReadXpmPixmap(fp, w, h, colrs, Ncolors, charspp);
	return (dataP);
    }
    if (*w == 0) {
	fprintf(stderr, "Invalid width.\n");
	return ((unsigned char *) NULL);
    }
    if (*h == 0) {
	fprintf(stderr, "Invalid height.\n");
	return ((unsigned char *) NULL);
    }
    padding = 0;
    if (((*w % 16) >= 1) && ((*w % 16) <= 8) && version10p) {
	padding = 1;
    }
    bytes_per_line = ((*w + 7) / 8) + padding;
    raster_length = bytes_per_line * *h;
    dataP = (unsigned char *) malloc((*w) * (*h));
    if (dataP == NULL) {
	fprintf(stderr, "Not enough memory.\n");
	return ((unsigned char *) NULL);
    }
    ptr = dataP;
    if (version10p) {
	int cnt = 0;
	int lim = (bytes_per_line - padding) * 8;
	for (bytes = 0; bytes < raster_length; bytes += 2) {
	    if (fscanf(fp, " 0x%x%*[,}]%*[ \n]", &value) != 1) {
		fprintf(stderr, "Error scanning bits item.\n");
		return ((unsigned char *) NULL);
	    }
	    temp = value;
	    value = temp & 0xff;
	    for (i = 0; i < 8; i++) {
		if (cnt < (*w)) {
		    if (value & nibMask[i])
			*ptr++ = blackbit;
		    else
			*ptr++ = whitebit;
		}
		if (++cnt >= lim)
		    cnt = 0;
	    }
	    if ((!padding) || ((bytes + 2) % bytes_per_line)) {
		value = temp >> 8;
		for (i = 0; i < 8; i++) {
		    if (cnt < (*w)) {
			if (value & nibMask[i])
			    *ptr++ = blackbit;
			else
			    *ptr++ = whitebit;
		    }
		    if (++cnt >= lim)
			cnt = 0;
		}
	    }
	}
    } else {
	int cnt = 0;
	int lim = bytes_per_line * 8;
	for (bytes = 0; bytes < raster_length; bytes++) {
	    if (fscanf(fp, " 0x%x%*[,}]%*[ \n]", &value) != 1) {
		fprintf(stderr, "Error scanning bits item.\n");
		return ((unsigned char *) NULL);
	    }
	    for (i = 0; i < 8; i++) {
		if (cnt < (*w)) {
		    if (value & nibMask[i])
			*ptr++ = blackbit;
		    else
			*ptr++ = whitebit;
		}
		if (++cnt >= lim)
		    cnt = 0;
	    }
	}
    }
    NumColors = 2;
    return (dataP);
}


unsigned char *
ReadEbmBitmap(fp, w, h, colrs)
FILE *fp;
int *w, *h;
struct colr_data *colrs;
{
    int i, temp, scale;
    unsigned int bmap_size;
    int *ptr[3];
    int red, green, blue;
    char line[1024];
    unsigned char *bit_data;
    unsigned char *bitp;

    bit_data = NULL;
    *w = 0;
    *h = 0;

    if ((fscanf(fp, "%12s %d %d %d\n", line, w, h, &scale) == 4) &&
	(strcmp(line, "xstitch_data") == 0)) {
	for (i = 0; i < 3; i++) {
	    fscanf(fp, "%s", line);
	    if (strcmp(line, "red") == 0) {
		ptr[i] = &red;
	    } else if (strcmp(line, "green") == 0) {
		ptr[i] = &green;
	    } else if (strcmp(line, "blue") == 0) {
		ptr[i] = &blue;
	    } else {
		fprintf(stderr, "File has improper format\n");
		return ((unsigned char *) NULL);
	    }
	}
	fscanf(fp, "[^\n]\n");
	for (i = 0; i < scale; i++) {
	    line[0] = '\0';
	    if (fscanf(fp, "%d %d %d%[^\n]\n", ptr[0], ptr[1], ptr[2], line) < 3) {
		fprintf(stderr, "Bad color data #%d\n", i);
	    }
	    colrs[i].red = red * 65536 / scale;
	    colrs[i].green = green * 65536 / scale;
	    colrs[i].blue = blue * 65536 / scale;
	}
	for (i = scale; i < 256; i++) {
	    colrs[i].red = 0;
	    colrs[i].green = 0;
	    colrs[i].blue = 0;
	}

	bmap_size = (*w) * (*h);
	bit_data = (unsigned char *) malloc(bmap_size);
	if (bit_data == NULL) {
	    fprintf(stderr, "Cannot allocate space for bitmap\n");
	}
	bitp = bit_data;
	for (i = 0; i < bmap_size; i++) {
	    if (dscan(fp, &temp) == -1)
		break;
	    if (temp > (256 - 1))
		temp = 0;
	    *bitp = (unsigned char) temp;
	    bitp++;
	}
    } else {
	return ((unsigned char *) NULL);
    }
    NumColors = scale;
    return (bit_data);
}


int
swapint(in)
int in;
{
    int out;

    out = 0;
    out = out | ((in >> 24) & 0xff);
    out = out | ((in >> 8) & 0xff00);
    out = out | ((in << 8) & 0xff0000);
    out = out | ((in << 24) & 0xff000000);
    return (out);
}


unsigned char *
ReadCompactEbmBitmap(fp, w, h, colrs)
FILE *fp;
int *w, *h;
struct colr_data *colrs;
{
    int i, scale;
    unsigned int bmap_size;
    char pix_file[1024];
    unsigned char *bit_data;
    unsigned char *bitp;
    struct ebmhdr Hdr;
    struct rgb_color color_data;
    int doswap;

    doswap = 0;
    bit_data = NULL;
    *w = 0;
    *h = 0;

    fread(&Hdr, sizeof(struct ebmhdr), 1, fp);
    if (strcmp(Hdr.magic, "xstitch") == 0) {
	/*
	 * a horrible hack to deal with different byte ordering on
	 * different machines.  Is based on assumption of only 2
	 * possible byte orderings, and never more than 256 colors.
	 */
	if (Hdr.num_colors > 256) {
	    doswap = 1;
	    Hdr.width = swapint(Hdr.width);
	    Hdr.height = swapint(Hdr.height);
	    Hdr.num_colors = swapint(Hdr.num_colors);
	}

	*w = Hdr.width;
	*h = Hdr.height;
	scale = Hdr.num_colors;
	for (i = 0; i < Hdr.num_colors; i++) {
	    fread(&color_data, sizeof(struct rgb_color), 1, fp);
	    if (doswap) {
		color_data.red = swapint(color_data.red);
		color_data.green = swapint(color_data.green);
		color_data.blue = swapint(color_data.blue);
		color_data.pix_len = swapint(color_data.pix_len);
	    }
	    colrs[i].red = color_data.red * 65536 / scale;
	    colrs[i].green = color_data.green * 65536 / scale;
	    colrs[i].blue = color_data.blue * 65536 / scale;
	    if (color_data.pix_len != 0) {
		if (color_data.pix_len > 1023) {
		    fprintf(stderr, "bad pattern\n");
		    return ((unsigned char *) NULL);
		}
		fread(pix_file, sizeof(char), color_data.pix_len, fp);
	    }
	}
	for (i = scale; i < 256; i++) {
	    colrs[i].red = 0;
	    colrs[i].green = 0;
	    colrs[i].blue = 0;
	}

	bmap_size = (*w) * (*h);
	bit_data = (unsigned char *) malloc(bmap_size);
	if (bit_data == NULL) {
	    fprintf(stderr, "Cannot allocate space for bitmap\n");
	}
	fread(bit_data, sizeof(unsigned char), ((*w) * (*h)), fp);

	bitp = bit_data;
	for (i = 0; i < bmap_size; i++) {
	    if ((int) *bitp > (256 - 1))
		*bitp = (unsigned char) 0;
	    bitp++;
	}
    } else {
	return ((unsigned char *) NULL);
    }
    NumColors = scale;
    return (bit_data);
}


unsigned char *
ReadBitmap(fp, w, h, colrs)
FILE *fp;
int *w, *h;
struct colr_data *colrs;
{
    unsigned char *bit_data;

    NumColors = 0;

    if (fp != NULL) {
	bit_data = ReadEbmBitmap(fp, w, h, colrs);
	if (bit_data != NULL) {
	    return (bit_data);
	}
	rewind(fp);
	bit_data = ReadCompactEbmBitmap(fp, w, h, colrs);
	if (bit_data != NULL) {
	    return (bit_data);
	}
#ifdef GIF
	rewind(fp);
	bit_data = ReadGifBitmap(fp, w, h, colrs);
	if (bit_data != NULL) {
	    return (bit_data);
	}
#endif
	rewind(fp);
	bit_data = ReadXbmBitmap(fp, w, h, colrs);
	if (bit_data != NULL) {
	    return (bit_data);
	}
    }
    return ((unsigned char *) NULL);
}