assert system is little-endian

@@ -85,3 +85,22 @@ std::string srs_dns_resolve(std::string host)
     return ipv4;
 }
 
+bool srs_is_little_endian()
+{
+    // convert to network(big-endian) order, if not equals, 
+    // the system is little-endian, so need to convert the int64
+    static int little_endian_check = -1;
+    
+    if(little_endian_check == -1) {
+        union {
+            int32_t i;
+            int8_t c;
+        } little_check_union;
+        
+        little_check_union.i = 0x01;
+        little_endian_check = little_check_union.c;
+    }
+    
+    return (little_endian_check == 1);
+}
+

@@ -99,6 +99,8 @@ extern void srs_update_system_time_ms();
 extern std::string srs_replace(std::string str, std::string old_str, std::string new_str);
 // dns resolve utility, return the resolved ip address.
 extern std::string srs_dns_resolve(std::string host);
+// whether system is little endian
+extern bool srs_is_little_endian();
 
 /**
 * disable copy constructor of class

@@ -30,6 +30,9 @@ SrsStream::SrsStream()
 {
     p = bytes = NULL;
     size = 0;
+    
+    // TODO: support both little and big endian.
+    srs_assert(srs_is_little_endian());
 }
 
 SrsStream::~SrsStream()

@@ -53,6 +53,9 @@ void handler(int signo)
 int main(int argc, char** argv) 
 {
     int ret = ERROR_SUCCESS;
+    
+    // TODO: support both little and big endian.
+    srs_assert(srs_is_little_endian());
 
 #ifdef SRS_GPERF_MP
     HeapProfilerStart("gperf.srs.gmp");