1 files changed, 97 insertions, 0 deletions
diff --git a/src/common/impl/time.c b/src/common/impl/time.c
new file mode 100644
index 0000000..c60d1fe
--- /dev/null
+++ b/src/common/impl/time.c
@@ -0,0 +1,97 @@
+#include "common/time.h"
+
+#include <stdio.h>
+
+char ffTimeInternalBuffer[64]; // Reduce memory usage and prevent redundant allocations
+
+#ifdef _WIN32
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wformat"
+#endif
+
+const char* ffTimeToFullStr(uint64_t msec) {
+    if (msec == 0) {
+        return "";
+    }
+    time_t tsec = (time_t) (msec / 1000);
+    const struct tm* tm = localtime(&tsec);
+
+    uint32_t len = 0;
+    len += (uint32_t) strftime(ffTimeInternalBuffer, ARRAY_SIZE(ffTimeInternalBuffer) - len, "%FT%T", tm);
+    len += (uint32_t) snprintf(ffTimeInternalBuffer + len, ARRAY_SIZE(ffTimeInternalBuffer) - len, ".%03u", (unsigned) (msec % 1000));
+    len += (uint32_t) strftime(ffTimeInternalBuffer + len, ARRAY_SIZE(ffTimeInternalBuffer) - len, "%z", tm);
+    return ffTimeInternalBuffer;
+}
+
+const char* ffTimeToShortStr(uint64_t msec) {
+    if (msec == 0) {
+        return "";
+    }
+    time_t tsec = (time_t) (msec / 1000);
+
+    strftime(ffTimeInternalBuffer, ARRAY_SIZE(ffTimeInternalBuffer), "%F %T", localtime(&tsec));
+    return ffTimeInternalBuffer;
+}
+
+const char* ffTimeToTimeStr(uint64_t msec) {
+    if (msec == 0) {
+        return "";
+    }
+    time_t tsec = (time_t) (msec / 1000);
+
+    uint32_t len = (uint32_t) strftime(ffTimeInternalBuffer, ARRAY_SIZE(ffTimeInternalBuffer), "%T", localtime(&tsec));
+    sprintf(ffTimeInternalBuffer + len, ".%03u", (unsigned) (msec % 1000));
+    return ffTimeInternalBuffer;
+}
+
+#ifdef _WIN32
+    #pragma GCC diagnostic pop
+#endif
+
+FFTimeGetAgeResult ffTimeGetAge(uint64_t birthMs, uint64_t nowMs) {
+    FFTimeGetAgeResult result = {};
+    if (__builtin_expect(birthMs == 0 || nowMs < birthMs, 0)) {
+        return result;
+    }
+
+    time_t birth_s = (time_t) (birthMs / 1000);
+    struct tm birth_tm;
+#ifdef _WIN32
+    localtime_s(&birth_tm, &birth_s);
+#else
+    localtime_r(&birth_s, &birth_tm);
+#endif
+
+    time_t now_s = (time_t) (nowMs / 1000);
+    struct tm now_tm;
+#ifdef _WIN32
+    localtime_s(&now_tm, &now_s);
+#else
+    localtime_r(&now_s, &now_tm);
+#endif
+
+    result.years = (uint32_t) (now_tm.tm_year - birth_tm.tm_year);
+    if (now_tm.tm_yday < birth_tm.tm_yday) {
+        result.years--;
+    }
+
+    birth_tm.tm_year += (int) result.years;
+    birth_s = mktime(&birth_tm);
+    uint32_t diff_s = (uint32_t) (now_s - birth_s);
+    result.daysOfYear = diff_s / (24 * 60 * 60);
+
+    birth_tm.tm_year += 1;
+    result.yearsFraction = (double) diff_s / (double) (mktime(&birth_tm) - birth_s) + result.years;
+
+    return result;
+}
+
+#ifdef _WIN32
+double ffQpcMultiplier;
+
+__attribute__((constructor)) static void ffTimeInitQpcMultiplier(void) {
+    LARGE_INTEGER frequency;
+    RtlQueryPerformanceFrequency(&frequency);
+    ffQpcMultiplier = 1000. / (double) frequency.QuadPart;
+}
+#endif