gd_xbm.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Marcus Boerger <helly@php.net>                               |
   +----------------------------------------------------------------------+
 */
 
/* $Id$ */
 
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
#include "gdhelpers.h"
#include "gd_errors.h"
 
#include "php.h"
 
#define MAX_XBM_LINE_SIZE 255
 
/* {{{ gdImagePtr gdImageCreateFromXbm */
gdImagePtr gdImageCreateFromXbm(FILE * fd)
{
    char fline[MAX_XBM_LINE_SIZE];
    char iname[MAX_XBM_LINE_SIZE];
    char *type;
    int value;
    unsigned int width = 0, height = 0;
    int fail = 0;
    int max_bit = 0;
 
    gdImagePtr im;
    int bytes = 0, i;
    int bit, x = 0, y = 0;
    int ch;
    char h[8];
    unsigned int b;
 
    rewind(fd);
    while (fgets(fline, MAX_XBM_LINE_SIZE, fd)) {
        fline[MAX_XBM_LINE_SIZE-1] = '\0';
        if (strlen(fline) == MAX_XBM_LINE_SIZE-1) {
            return 0;
        }
        if (sscanf(fline, "#define %s %d", iname, &value) == 2) {
            if (!(type = strrchr(iname, '_'))) {
                type = iname;
            } else {
                type++;
            }
 
            if (!strcmp("width", type)) {
                width = (unsigned int) value;
            }
            if (!strcmp("height", type)) {
                height = (unsigned int) value;
            }
        } else {
            if ( sscanf(fline, "static unsigned char %s = {", iname) == 1
              || sscanf(fline, "static char %s = {", iname) == 1)
            {
                max_bit = 128;
            } else if (sscanf(fline, "static unsigned short %s = {", iname) == 1
                    || sscanf(fline, "static short %s = {", iname) == 1)
            {
                max_bit = 32768;
            }
            if (max_bit) {
                bytes = (width + 7) / 8 * height;
                if (!bytes) {
                    return 0;
                }
                if (!(type = strrchr(iname, '_'))) {
                    type = iname;
                } else {
                    type++;
                }
                if (!strcmp("bits[]", type)) {
                    break;
                }
            }
        }
    }
    if (!bytes || !max_bit) {
        return 0;
    }
 
    if(!(im = gdImageCreate(width, height))) {
        return 0;
    }
    gdImageColorAllocate(im, 255, 255, 255);
    gdImageColorAllocate(im, 0, 0, 0);
    h[2] = '\0';
    h[4] = '\0';
    for (i = 0; i < bytes; i++) {
        while (1) {
            if ((ch=getc(fd)) == EOF) {
                fail = 1;
                break;
            }
            if (ch == 'x') {
                break;
            }
        }
        if (fail) {
            break;
        }
        /* Get hex value */
        if ((ch=getc(fd)) == EOF) {
            break;
        }
        h[0] = ch;
        if ((ch=getc(fd)) == EOF) {
            break;
        }
        h[1] = ch;
        if (max_bit == 32768) {
            if ((ch=getc(fd)) == EOF) {
                break;
            }
            h[2] = ch;
            if ((ch=getc(fd)) == EOF) {
                break;
            }
            h[3] = ch;
        }
        if (sscanf(h, "%x", &b) != 1) {
            gd_error("Invalid XBM");
            gdImageDestroy(im);
            return 0;
        }
        for (bit = 1; bit <= max_bit; bit = bit << 1) {
            gdImageSetPixel(im, x++, y, (b & bit) ? 1 : 0);
            if (x == im->sx) {
                x = 0;
                y++;
                if (y == im->sy) {
                    return im;
                }
                break;
            }
        }
    }
 
    gd_error("EOF before image was complete");
    gdImageDestroy(im);
    return 0;
}
/* }}} */
 
/* {{{ gdCtxPrintf */
void gdCtxPrintf(gdIOCtx * out, const char *format, ...)
{
    char *buf;
    int len;
    va_list args;
 
    va_start(args, format);
    len = vspprintf(&buf, 0, format, args);
    va_end(args);
    out->putBuf(out, buf, len);
    efree(buf);
}
/* }}} */
 
/* {{{ gdImageXbmCtx */
void gdImageXbmCtx(gdImagePtr image, char* file_name, int fg, gdIOCtx * out)
{
    int x, y, c, b, sx, sy, p;
    char *name, *f;
    size_t i, l;
 
    name = file_name;
    if ((f = strrchr(name, '/')) != NULL) name = f+1;
    if ((f = strrchr(name, '\\')) != NULL) name = f+1;
    name = estrdup(name);
    if ((f = strrchr(name, '.')) != NULL && !strcasecmp(f, ".XBM")) *f = '\0';
    if ((l = strlen(name)) == 0) {
        efree(name);
        name = estrdup("image");
    } else {
        for (i=0; i<l; i++) {
            /* only in C-locale isalnum() would work */
            if (!isupper(name[i]) && !islower(name[i]) && !isdigit(name[i])) {
                name[i] = '_';
            }
        }
    }
 
    gdCtxPrintf(out, "#define %s_width %d\n", name, gdImageSX(image));
    gdCtxPrintf(out, "#define %s_height %d\n", name, gdImageSY(image));
    gdCtxPrintf(out, "static unsigned char %s_bits[] = {\n  ", name);
 
    efree(name);
 
    b = 1;
    p = 0;
    c = 0;
    sx = gdImageSX(image);
    sy = gdImageSY(image);
    for (y = 0; y < sy; y++) {
        for (x = 0; x < sx; x++) {
            if (gdImageGetPixel(image, x, y) == fg) {
                c |= b;
            }
            if ((b == 128) || (x == sx - 1)) {
                b = 1;
                if (p) {
                    gdCtxPrintf(out, ", ");
                    if (!(p%12)) {
                        gdCtxPrintf(out, "\n  ");
                        p = 12;
                    }
                }
                p++;
                gdCtxPrintf(out, "0x%02X", c);
                c = 0;
            } else {
                b <<= 1;
            }
        }
    }
    gdCtxPrintf(out, "};\n");
}
/* }}} */