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enumerateLedmaps improvements

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improve reading on ledmap names
* remove trailing " " "," "\r"
* clear buffer between reads
* fix for a 1-byte buffer overflow
This commit is contained in:
Frank
2023-06-08 22:26:55 +02:00
parent 3560b27dc1
commit 23ea201b43
1 changed files with 14 additions and 12 deletions
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26
wled00/FX_fcn.cpp
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@@ -1392,16 +1392,16 @@ void WS2812FX::enumerateLedmaps() {
f = WLED_FS.open(fileName, "r");
if (f) {
f.find("\"n\":");
char name[33];
f.readBytesUntil('\n', name, sizeof(name));
char name[34] = { '\0' }; // ensure string termination
f.readBytesUntil('\n', name, sizeof(name)-1);
size_t len = 0;
if (name != nullptr) {
len = strlen(name);
if (len > 0 && len < 33) {
ledmapNames[i-1] = new char[len+1];
if (ledmapNames[i-1]) strlcpy(ledmapNames[i-1], name, 33);
}
size_t len = strlen(name);
if (len > 0 && len < 33) {
if ((len > 0) && (name[len-1] == '\r')) { name[len-1] = '\0'; len--;} // kill trailing `\r` (DOS format: \r\n)
if ((len > 0) && (name[len-1] == ',')) { name[len-1] = '\0'; len--;} // kill trailing `,`
if ((len > 0) && (name[len-1] == ' ')) { name[len-1] = '\0'; len--;} // kill trailing ` `
ledmapNames[i-1] = new char[len+1]; // +1 to include terminating \0
if (ledmapNames[i-1]) strlcpy(ledmapNames[i-1], name, 33);
}
if (!ledmapNames[i-1]) {
char tmp[33];
@@ -1412,18 +1412,20 @@ void WS2812FX::enumerateLedmaps() {
}
//WLEDMM calc ledmapMaxSize (TroyHack)
char dim[33];
char dim[34] = { '\0' };
f.find("\"width\":");
f.readBytesUntil('\n', dim, sizeof(dim)); //hack: use fileName as we have this allocated already
f.readBytesUntil('\n', dim, sizeof(dim)-1); //hack: use fileName as we have this allocated already
uint16_t maxWidth = atoi(dim);
f.find("\"height\":");
f.readBytesUntil('\n', dim, sizeof(dim));
memset(dim, 0, sizeof(dim)); // clear buffer before reading
f.readBytesUntil('\n', dim, sizeof(dim)-1);
uint16_t maxHeight = atoi(dim);
ledmapMaxSize = MAX(ledmapMaxSize, maxWidth * maxHeight);
USER_PRINTF("enumerateLedmaps %s %s (%dx%d -> %d)\n", fileName, name, maxWidth, maxHeight, ledmapMaxSize);
}
f.close();
USER_FLUSH();
releaseJSONBufferLock();
}
#endif