File: gdxpm.c

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/*
 * Add ability to load xpm files to gd, requires the xpm
 * library.
 * Caolan.McNamara@ul.ie
 * http://www.csn.ul.ie/~caolan
 */

#ifdef HAVE_CONFIG_H
#	include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gd.h"
#include "gdhelpers.h"
#include "gd_color_map.h"
#include "gd_errors.h"

#ifndef HAVE_LIBXPM
BGD_DECLARE(gdImagePtr) gdImageCreateFromXpm(char *filename)
{
	(void)filename;
	gd_error_ex(GD_ERROR, "libgd was not built with xpm support\n");
	return NULL;
}
#else

#include <X11/xpm.h>

BGD_DECLARE(gdImagePtr) gdImageCreateFromXpm(char *filename)
{
	XpmInfo info;
	XpmImage image;
	unsigned int i, j, k, number, len;
	char buf[5];
	gdImagePtr im = 0;
	int *pointer;
	int red = 0, green = 0, blue = 0;
	int *colors;
	int ret;

	ret = XpmReadFileToXpmImage(filename, &image, &info);
	if(ret != XpmSuccess) {
		return 0;
	}

	number = image.ncolors;
	if(overflow2(sizeof(int), number)) {
		goto done;
	}
	for(i = 0; i < number; i++) {
		/*
		   avoid NULL pointer dereference
		   TODO better fix need to manage monochrome/monovisual
		   see m_color or g4_color or g_color
		*/
		if (!image.colorTable[i].c_color) {
			goto done;
		}
	}

	colors = (int *)gdMalloc(sizeof(int) * number);
	if(colors == NULL) {
		goto done;
	}

	if(!(im = gdImageCreate(image.width, image.height))) {
		gdFree(colors);
		goto done;
	}

	for(i = 0; i < number; i++) {
		char *c_color = image.colorTable[i].c_color;
		if(strcmp(c_color, "None") == 0) {
			colors[i] = gdImageGetTransparent(im);
			if(colors[i] == -1) colors[i] = gdImageColorAllocate(im, 0, 0, 0);
			if(colors[i] != -1) gdImageColorTransparent(im, colors[i]);
			continue;
		}
		len = strlen(c_color);
		if(len < 1) continue;
		if(c_color[0] == '#') {
			switch(len) {
			case 4:
				buf[2] = '\0';
				buf[0] = buf[1] = c_color[1];
				red = strtol(buf, NULL, 16);

				buf[0] = buf[1] = c_color[2];
				green = strtol(buf, NULL, 16);

				buf[0] = buf[1] = c_color[3];
				blue = strtol(buf, NULL, 16);
				break;

			case 7:
				buf[2] = '\0';
				buf[0] = c_color[1];
				buf[1] = c_color[2];
				red = strtol(buf, NULL, 16);

				buf[0] = c_color[3];
				buf[1] = c_color[4];
				green = strtol(buf, NULL, 16);

				buf[0] = c_color[5];
				buf[1] = c_color[6];
				blue = strtol(buf, NULL, 16);
				break;

			case 10:
				buf[3] = '\0';
				buf[0] = c_color[1];
				buf[1] = c_color[2];
				buf[2] = c_color[3];
				red = strtol(buf, NULL, 16);
				red /= 64;

				buf[0] = c_color[4];
				buf[1] = c_color[5];
				buf[2] = c_color[6];
				green = strtol(buf, NULL, 16);
				green /= 64;

				buf[0] = c_color[7];
				buf[1] = c_color[8];
				buf[2] = c_color[9];
				blue = strtol(buf, NULL, 16);
				blue /= 64;
				break;

			case 13:
				buf[4] = '\0';
				buf[0] = c_color[1];
				buf[1] = c_color[2];
				buf[2] = c_color[3];
				buf[3] = c_color[4];
				red = strtol(buf, NULL, 16);
				red /= 256;

				buf[0] = c_color[5];
				buf[1] = c_color[6];
				buf[2] = c_color[7];
				buf[3] = c_color[8];
				green = strtol(buf, NULL, 16);
				green /= 256;

				buf[0] = c_color[9];
				buf[1] = c_color[10];
				buf[2] = c_color[11];
				buf[3] = c_color[12];
				blue = strtol(buf, NULL, 16);
				blue /= 256;
				break;
			}
		} else if(!gdColorMapLookup(GD_COLOR_MAP_X11, c_color, &red, &green, &blue)) {
			continue;
		}

		colors[i] = gdImageColorResolve(im, red, green, blue);
	}

	pointer = (int *)image.data;

	for(i = 0; i < image.height; i++) {
		for(j = 0; j < image.width; j++) {
			k = *pointer++;
			gdImageSetPixel(im, j, i, colors[k]);
		}
	}

	gdFree(colors);

done:
	XpmFreeXpmImage(&image);
	XpmFreeXpmInfo(&info);
	return im;
}
#endif /* HAVE_LIBXPM */