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[svg2png] size limitation while converting the file

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In case the svg file size is too large, a heap overflow occurred
when conversting to png. To prevent this a size limitation
has been added - the resolution of the resulting png file cannot
be higher than 8k (7680 x 4320).
This commit is contained in:
Mira Grudzinska 2022-11-20 20:46:50 +01:00 • committed by Mira Grudzinska
parent 0aec18dc75
commit a863f29512
1 changed files with 18 additions and 1 deletions
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19
src/bin/svg2png/svg2png.cpp
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@ -37,6 +37,10 @@
#include <sys/stat.h> #include <sys/stat.h>
#endif #endif
#define WIDTH_8K 7680
#define HEIGHT_8K 4320
#define SIZE_8K 33177600 //WIDTH_8K x HEIGHT_8K
using namespace std; using namespace std;
struct PngBuilder struct PngBuilder
@ -94,6 +98,19 @@ public:
picture->size(&fw, &fh); picture->size(&fw, &fh);
w = static_cast<uint32_t>(fw); w = static_cast<uint32_t>(fw);
h = static_cast<uint32_t>(fh); h = static_cast<uint32_t>(fh);
if (w * h > SIZE_8K) {
float scale = fw / fh;
if (scale > 1) {
w = WIDTH_8K;
h = static_cast<uint32_t>(w / scale);
} else {
h = HEIGHT_8K;
w = static_cast<uint32_t>(h * scale);
}
cout << "Warning: The SVG width and/or height values exceed the 8k resolution. "
"To avoid the heap overflow, the conversion to the PNG file made in " << WIDTH_8K << " x " << HEIGHT_8K << " resolution." << endl;
}
} else { } else {
picture->size(w, h); picture->size(w, h);
} }
@ -272,7 +289,7 @@ private:
private: private:
int help() int help()
{ {
cout << "Usage:\n svg2png [SVG files] [-r resolution] [-b bgColor]\n\nFlags:\n -r set the output image resolution.\n -b set the output image background color.\n\nExamples:\n $ svg2png input.svg\n $ svg2png input.svg -r 200x200\n $ svg2png input.svg -r 200x200 -b ff00ff\n $ svg2png input1.svg input2.svg -r 200x200 -b ff00ff\n $ svg2png . -r 200x200\n\n"; cout << "Usage:\n svg2png [SVG files] [-r resolution] [-b bgColor]\n\nFlags:\n -r set the output image resolution.\n -b set the output image background color.\n\nExamples:\n $ svg2png input.svg\n $ svg2png input.svg -r 200x200\n $ svg2png input.svg -r 200x200 -b ff00ff\n $ svg2png input1.svg input2.svg -r 200x200 -b ff00ff\n $ svg2png . -r 200x200\n\nNote:\n In the case, where the width and height in the SVG file determine the size of the image in resolution higher than 8k (7680 x 4320), limiting the resolution to this value is enforced.\n\n";
return 1; return 1;
} }