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ledmap parser robustness improvements

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* do not read past end of array "]"
* digest "unexpected" order of tags (always rewind input)
* better user message on success
This commit is contained in:
Frank
2025-12-30 22:07:12 +01:00
committed by GitHub
parent 9db1022b9d
commit 32ed6cafc1
1 changed files with 13 additions and 6 deletions
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19
wled00/FX_fcn.cpp
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@@ -2660,6 +2660,7 @@ bool WS2812FX::deserializeMap(uint8_t n) {
//DEBUG_PRINTF(" (\"width\": %s) ", fileName)
memset(fileName, 0, sizeof(fileName)); // clear old buffer
f.seek(0); // rewind to start
f.find("\"height\":");
f.readBytesUntil('\n', fileName, sizeof(fileName)-1);
uint16_t maxHeight = atoi(cleanUpName(fileName));
@@ -2677,7 +2678,7 @@ bool WS2812FX::deserializeMap(uint8_t n) {
#endif
}
USER_PRINTF("deserializeMap %d x %d\n", Segment::maxWidth, Segment::maxHeight);
DEBUG_PRINTF("deserializeMap %d x %d\n", Segment::maxWidth, Segment::maxHeight);
//WLEDMM recreate customMappingTable if more space needed
if (Segment::maxWidth * Segment::maxHeight > customMappingTableSize) {
@@ -2707,21 +2708,27 @@ bool WS2812FX::deserializeMap(uint8_t n) {
// WLEDMM reset mapping table before loading
//memset(customMappingTable, 0xFF, customMappingTableSize * sizeof(uint16_t)); // FFFF = no pixel
for (unsigned i=0; i<customMappingTableSize; i++) customMappingTable[i]=i; // "neutral" 1:1 mapping
//WLEDMM: find the map values
f.seek(0); // rewind to start
f.find("\"map\":");
f.readBytesUntil('[', fileName, sizeof(fileName)-1); // drop everything until "["
uint16_t i=0;
bool endOfArray = false;
do { //for each element in the array
int mapi = f.readStringUntil(',').toInt();
// USER_PRINTF(", %d(%d)", mapi, i);
String entry = f.readStringUntil(',');
int mapi = entry.toInt();
//DEBUG_PRINTF("%c %d(%d)", i>0?',':' ', mapi, i);
if (i < customMappingSize) customMappingTable[i++] = (uint16_t) (mapi<0 ? 0xFFFFU : mapi); // WLEDMM do not write past array bounds
} while (f.available() && (i < customMappingSize));
endOfArray = entry.indexOf("]") >= 0; // if we hit "]", stop reading
} while (f.available() && (i < customMappingSize) && !endOfArray);
//DEBUG_PRINTLN("");
loadedLedmap = n;
f.close();
USER_PRINTF("Custom ledmap: %d size=%d\n", loadedLedmap, customMappingSize);
if ((customMappingTable != nullptr) && (customMappingSize>0)) {
USER_PRINTF(PSTR("Ledmap #%d read. Size=%d (%d x %d); %d items found.\n"), loadedLedmap, customMappingSize, Segment::maxWidth, Segment::maxHeight, i);
}
#ifdef WLED_DEBUG_MAPS
for (uint16_t j=0; j<customMappingSize; j++) { // fixing a minor warning: declaration of 'i' shadows a previous local
if (!(j%Segment::maxWidth)) DEBUG_PRINTLN();