Jan/WLED_MM_Infinity
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decoder robustness improvements, and some nitpick

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Frank
2025-11-20 00:12:26 +01:00
parent 5597695865
commit 6a4716e490
2 changed files with 12 additions and 4 deletions
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13
wled00/src/font/unicodetool.cpp
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@@ -53,7 +53,9 @@ const unsigned char* nextUnicode(const unsigned char* utf8, size_t maxLen) {
if (length < 1) return nullptr; // we are at end of input
unsigned char ch0 = *utf8; // get leading character
size_t codeLength = 1; // default: 1-byte ASCII
// Calculate code length based on lead byte
size_t codeLength = 1; // default: 1-byte ASCII
if (ch0 >= 0x80) {
if ((ch0 & 0b11100000) == 0b11000000) codeLength = 2; // 2-byte sequence
else if ((ch0 & 0b11110000) == 0b11100000) codeLength = 3; // 3-byte sequence
@@ -61,8 +63,13 @@ const unsigned char* nextUnicode(const unsigned char* utf8, size_t maxLen) {
else codeLength = 1; // Skip single invalid byte and try to resync
}
if (length < codeLength) return nullptr; // Check if we have enough bytes
else return utf8 + codeLength; // success: advance stream
// handle invalid continuation bytes
if ((codeLength >= 2) && (length < 2 || !isValidContinuation(utf8[1]))) codeLength = 1; // try to re-sync
if ((codeLength >= 3) && (length < 3 || !isValidContinuation(utf8[2]))) codeLength = 1; // try to re-sync
if ((codeLength >= 4) && (length < 4 || !isValidContinuation(utf8[3]))) codeLength = 1; // try to re-sync
if (length < codeLength) return nullptr; // Check if we have enough bytes
else return utf8 + codeLength; // success: advance stream
}
#endif