add function short2buff and buff2short

HISTORY

 
-Version 1.06  2014-05-28
+Version 1.06  2014-05-30
   * update source code from FastDFS V5.02
+  * add function short2buff and buff2short
 
 Version 1.05  2012-07-08
   * update source code from FastDFS V3.09

src/shared_func.c

@@ -1140,6 +1140,20 @@ int safeWriteToFile(const char *filename, const char *buff, \
 	return 0;
 }
 
+void short2buff(const short n, char *buff)
+{
+	unsigned char *p;
+	p = (unsigned char *)buff;
+	*p++ = (n >> 8) & 0xFF;
+	*p++ = n & 0xFF;
+}
+
+short buff2short(const char *buff)
+{
+	return  (short)((((unsigned char)(*(buff))) << 8) | \
+		((unsigned char)(*(buff+1))));
+}
+
 void int2buff(const int n, char *buff)
 {
 	unsigned char *p;

src/shared_func.h

@@ -147,6 +147,21 @@ char *hex2bin(const char *s, char *szBinBuff, int *nDestLen);
 */
 void printBuffHex(const char *s, const int len);
 
+/** 16 bits int convert to buffer (big-endian)
+ *  parameters:
+ *  	n: 16 bits int value
+ *  	buff: the buffer, at least 2 bytes space, no tail \0
+ *  return: none
+*/
+void short2buff(const short n, char *buff);
+
+/** buffer convert to 16 bits int
+ *  parameters:
+ *  	buff: big-endian 2 bytes buffer
+ *  return: 16 bits int value
+*/
+short buff2short(const char *buff);
+
 /** 32 bits int convert to buffer (big-endian)
  *  parameters:
  *  	n: 32 bits int value