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Fix a > to >=, and avoid underflow in some sanity checks

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This commit is contained in:
Rangi
2026-07-13 13:14:06 -04:00
parent e9fa1e4e94
commit 21eaa2d2cc
1 changed files with 10 additions and 12 deletions
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src/gfx/reverse.cpp
+10 -12
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@@ -296,7 +296,7 @@ void reverse() {
uint8_t attr = (*attrmap)[index];
size_t tx = index % width, ty = index / width;
if (uint8_t palID = (attr & 0b111) - options.basePalID; palID > palettes.size()) {
if (uint8_t palID = attr & 0b111; palID >= palettes.size() + options.basePalID) {
error(
"Attribute map references palette #%u at (%zu, %zu), but there are only %zu "
"palettes",
@@ -320,9 +320,9 @@ void reverse() {
);
}
} else {
if (uint8_t tileOfs = (*tilemap)[index] - options.baseTileIDs[bank];
tileOfs >= nbTilesInBank[bank]) {
nbTilesInBank[bank] = tileOfs + 1;
if (uint8_t tileID = (*tilemap)[index];
tileID >= nbTilesInBank[bank] + options.baseTileIDs[bank]) {
nbTilesInBank[bank] = tileID - options.baseTileIDs[bank] + 1;
}
}
}
@@ -366,8 +366,7 @@ void reverse() {
uint8_t attr = (*attrmap)[index];
bool bank = attr & 0b1000;
if (uint8_t tileOfs = tileID - options.baseTileIDs[bank];
tileOfs >= options.maxNbTiles[bank]) {
if (tileID >= options.maxNbTiles[bank] + options.baseTileIDs[bank]) {
error(
"Tilemap references tile #%" PRIu8
" at (%zu, %zu), but the limit for bank %u is %" PRIu16,
@@ -382,8 +381,7 @@ void reverse() {
} else {
size_t const limit = std::min<size_t>(nbTiles, options.maxNbTiles[0]);
for (size_t index = 0; index < mapSize; ++index) {
if (uint8_t tileID = (*tilemap)[index];
static_cast<uint8_t>(tileID - options.baseTileIDs[0]) >= limit) {
if (uint8_t tileID = (*tilemap)[index]; tileID >= limit + options.baseTileIDs[0]) {
size_t tx = index % width, ty = index / width;
error(
"Tilemap references tile #%" PRIu8 " at (%zu, %zu), but the limit is %zu",
@@ -519,14 +517,14 @@ void reverse() {
: index;
// This should have been enforced by the earlier checking.
assume(tileOfs < nbTiles + options.trim);
size_t palID = (palmap ? (*palmap)[index] : attribute & 0b111) - options.basePalID;
assume(palID < palettes.size()); // Should be ensured on data read
size_t palOfs = (palmap ? (*palmap)[index] : attribute & 0b111) - options.basePalID;
assume(palOfs < palettes.size()); // Should be ensured on data read
// We do not have data for tiles trimmed with `-x`, so assume they are "blank"
static std::array<uint8_t, 16> const trimmedTile{0x00};
uint8_t const *tileData =
tileOfs >= nbTiles ? trimmedTile.data() : &tiles[tileOfs * tileSize];
auto const &palette = palettes[palID];
auto const &palette = palettes[palOfs];
for (uint8_t y = 0; y < 8; ++y) {
// If vertically mirrored, fetch the bytes from the other end
uint8_t realY = (attribute & 0x40 ? 7 - y : y) * options.bitDepth;
@@ -547,7 +545,7 @@ void reverse() {
if (pngColorType == PNG_COLOR_TYPE_GRAY) {
gray = gray << pngDepth | (pixel.red & ((1 << pngDepth) - 1));
} else if (pngColorType == PNG_COLOR_TYPE_PALETTE) {
*ptr++ = palID * 4 + colorID;
*ptr++ = palOfs * 4 + colorID;
} else {
*ptr++ = pixel.red;
*ptr++ = pixel.green;