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Working libpng version #682

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109 changes: 108 additions & 1 deletion contrib/oss-fuzz/libpng_read_fuzzer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,13 @@
// 4. adding read_end_info() and creating an end_info structure.
// 5. adding calls to png_set_*() transforms commonly used by browsers.



#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <vector>

Expand Down Expand Up @@ -66,6 +69,9 @@ struct PngObjectHandler {
}
};




void user_read_data(png_structp png_ptr, png_bytep data, size_t length) {
BufState* buf_state = static_cast<BufState*>(png_get_io_ptr(png_ptr));
if (length > buf_state->bytes_left) {
Expand Down Expand Up @@ -152,9 +158,107 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
return 0;
}

// Reading.
// Update.

png_read_info(png_handler.png_ptr, png_handler.info_ptr);

// randomize_functionality(&png_handler);
unsigned seed = 0;
for (size_t i = 0; i < size; ++i) {
seed += data[i];
}
srand(seed);
png_color_16 background = {0};
background.red = 255;
background.green = 100;
background.blue = 50;
background.gray = 200;

if (rand() % 2) {
png_set_strip_alpha(png_handler.png_ptr);
} else {
if (rand() % 2) {
png_set_background(png_handler.png_ptr, &background, PNG_BACKGROUND_GAMMA_FILE, 0, 1.0);
} else {
png_set_background(png_handler.png_ptr, &background, PNG_BACKGROUND_GAMMA_SCREEN, 0,1.0);
}
}

if (rand() % 2) {
png_set_gamma(png_handler.png_ptr, 1.0, 1.0);
}

switch (rand() % 4) {
case 0:
// Set PNG_GAMMA
png_set_gamma(png_handler.png_ptr, 2.2, 0.45455);
break;
case 1:
// Set PNG_RGB_TO_GRAY
png_set_rgb_to_gray_fixed(png_handler.png_ptr, 1, -1, -1);
png_set_gamma(png_handler.png_ptr, 2.2, 0.45455);
break;
case 2:
// Set PNG_COMPOSE
// png_color_16 background = {0, 255, 255, 255, 0};
png_set_gamma(png_handler.png_ptr, 2.2, 0.45455);
switch (rand() % 3) {
case 0:
png_set_background(
png_handler.png_ptr,
&background,
PNG_BACKGROUND_GAMMA_FILE,
0,
1.0
);
break;
case 1:
png_set_background(
png_handler.png_ptr,
&background,
PNG_BACKGROUND_GAMMA_UNIQUE,
0,
1.0
);
break;
case 2:
png_set_background(
png_handler.png_ptr,
&background,
PNG_BACKGROUND_GAMMA_SCREEN,
0,
1.0
);
break;
}
break;

case 3:
// Set PNG_ENCODE_ALPHA
png_set_alpha_mode(png_handler.png_ptr, PNG_ALPHA_STANDARD, 1.0);
png_set_gamma(png_handler.png_ptr, 2.2, 0.45455);
break;
}

if (rand() % 2) {
double gamma_value = 2.2;
png_set_gAMA(png_handler.png_ptr, png_handler.info_ptr, gamma_value);
}

if (rand() % 2) {
png_set_IHDR(png_handler.png_ptr, png_handler.info_ptr,
100, 100,
8,
PNG_COLOR_TYPE_PALETTE,
PNG_COLOR_TYPE_PALETTE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT
);
}

void png_read_update_info(png_structp png_ptr, png_infop info_ptr);


// reset error handler to put png_deleter into scope.
if (setjmp(png_jmpbuf(png_handler.png_ptr))) {
PNG_CLEANUP
Expand Down Expand Up @@ -221,3 +325,6 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

return 0;
}