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Fix several out-of-bound reads; fix a memory leak

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This commit is contained in:
Lior Halphon 2020-04-02 20:59:19 +03:00
parent 5d97f15f80
commit 7878dd6d4b
1 changed files with 16 additions and 4 deletions
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20
tools/gfx.c
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@ -102,9 +102,13 @@ void trim_whitespace(struct Graphic *graphic) {
void remove_whitespace(struct Graphic *graphic) {
int tile_size = Options.depth * 8;
if (Options.interleave) tile_size *= 2;
// Make sure we have a whole number of tiles, round down if required
graphic->size &= tile_size - 1;
int i = 0;
for (int j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (is_whitespace(&graphic->data[j], tile_size)) {
while (j < graphic->size && is_whitespace(&graphic->data[j], tile_size)) {
j += tile_size;
}
if (j >= graphic->size) {
@ -136,8 +140,12 @@ void remove_duplicates(struct Graphic *graphic) {
int tile_size = Options.depth * 8;
if (Options.interleave) tile_size *= 2;
int num_tiles = 0;
// Make sure we have a whole number of tiles, round down if required
graphic->size &= tile_size - 1;
for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (tile_exists(&graphic->data[j], graphic->data, tile_size, num_tiles)) {
while (j < graphic->size && tile_exists(&graphic->data[j], graphic->data, tile_size, num_tiles)) {
if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) {
break;
}
@ -155,7 +163,7 @@ void remove_duplicates(struct Graphic *graphic) {
}
bool flip_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles, bool xflip, bool yflip) {
uint8_t *flip = calloc(tile_size, 1);
uint8_t *flip = alloca(tile_size);
int half_size = tile_size / 2;
for (int i = 0; i < tile_size; i++) {
int byte = i;
@ -183,8 +191,12 @@ void remove_flip(struct Graphic *graphic, bool xflip, bool yflip) {
int tile_size = Options.depth * 8;
if (Options.interleave) tile_size *= 2;
int num_tiles = 0;
// Make sure we have a whole number of tiles, round down if required
graphic->size &= tile_size - 1;
for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (flip_exists(&graphic->data[j], graphic->data, tile_size, num_tiles, xflip, yflip)) {
while (j < graphic->size && flip_exists(&graphic->data[j], graphic->data, tile_size, num_tiles, xflip, yflip)) {
if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) {
break;
}