[fix] fastSeqIdToBuffer function edge case error fixed.

Author: kimmanbo

src/commons/Util.cpp

@@ -261,20 +261,22 @@ char* Util::fastSeqIdToBuffer(float seqId, char* buffer) {
         *(buffer) = '0';
         buffer++;
         *(buffer) = '\0';
+        buffer++;
     } else {
+        const int scaledSeqId = static_cast<int>(seqId * 1000);
         *(buffer) = '0';
         buffer++;
         *(buffer) = '.';
         buffer++;
-        if (seqId < 0.10) {
+        if (scaledSeqId < 100) {
             *(buffer) = '0';
             buffer++;
         }
-        if (seqId < 0.01) {
+        if (scaledSeqId < 10) {
             *(buffer) = '0';
             buffer++;
         }
-        buffer = Itoa::i32toa_sse2((int)(seqId * 1000), buffer);
+        buffer = Itoa::i32toa_sse2(scaledSeqId, buffer);
     }
     return buffer;
 }
@@ -737,4 +739,4 @@ std::string SSTR(float x) {
 template<>
 std::string SSTR(float x, int precision) {
     return fmt::format("{:.{}f}", x, precision);
-}
+}

src/commons/Util.h

@@ -145,6 +145,8 @@ class Util {
         return sign * val;
     }
 
+    // Writes a null-terminated identity with three fractional digits for values in [0.0f, 1.0f]
+    // and returns one byte past the terminator.
     static char* fastSeqIdToBuffer(float seqId, char* buffer);
 
     static bool isNumber(const std::string& s)