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Fix: Filechooser preview of XML file shows it as a corrupt image (#926)

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ManoloFLTK 2024-03-11 11:36:47 +01:00
parent 7bbe75c84e
commit 20e8da9dfd
1 changed files with 12 additions and 24 deletions
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36
src/fl_images_core.cxx
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@ -36,7 +36,6 @@
#include <FL/fl_utf8.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "flstring.h"
#if defined(HAVE_LIBZ)
#include <zlib.h>
@ -126,22 +125,12 @@ fl_check_images(const char *name, // I - Filename
// SVG or SVGZ (gzip'ed SVG)
#ifdef FLTK_USE_SVG
uchar header2[300]; // buffer for decompression
uchar header2[64]; // buffer for decompression
uchar *buf = header; // original header data
int count = headerlen; // original header data size
// Note: variables 'buf' and 'count' may be overwritten subsequently
// if the image data is xml or gzip'ed *and* we can decompress the data
if (count >= 5 && memcmp(header, "<?xml", 5) == 0) {
FILE *in = fl_fopen(name, "r");
if (in) {
buf = header2;
count = sizeof(header2);
count = fread(header2, 1, count, in);
fclose(in);
}
}
// if the image data is gzip'ed *and* we can decompress the data
# if defined(HAVE_LIBZ)
if (header[0] == 0x1f && header[1] == 0x8b) { // gzip'ed data
@ -169,18 +158,17 @@ fl_check_images(const char *name, // I - Filename
}
// Check svg or xml signature
bool found_svg = false;
if (count >= 4 && memcmp(buf, "<svg", 4) == 0) found_svg = true;
else if (count >= 5 && memcmp(buf, "<?xml", 5) == 0) {
uchar *p = buf;
do {
if (memcmp(p, "<svg", 4) == 0) {
found_svg = true;
break;
}
} while (++p < buf + count - 4);
while (count && isspace(buf[0])) { buf++; count--; }
if ((count >= 5 &&
(memcmp(buf, "<?xml", 5) == 0 ||
memcmp(buf, "<svg", 4) == 0 ||
memcmp(buf, "<!--", 4) == 0))) {
Fl_SVG_Image *image = new Fl_SVG_Image(name);
if (image->w() && image->h())
return image;
delete image;
}
if (found_svg) return new Fl_SVG_Image(name);
#endif // FLTK_USE_SVG
// unknown image format