Add rpmtdGetNumber() for getting numeric values from tag container

- returns the value (as opposed to pointer to, like the rpmtdGetUint32()
  and the like do) of any numeric type as uint64_t (largest supported
  integer type so everything can be converted to it)
- handy when you don't really care what the internal presentation is
- there's no rpmtdGetNextNumber() as there's no meaningful way to return
  end-of-iteration here

lib/rpmtd.c

@@ -217,6 +217,32 @@ const char * rpmtdGetString(rpmtd td)
     return str;
 }
 
+uint64_t rpmtdGetNumber(rpmtd td)
+{
+    assert(td != NULL);
+    uint64_t val = 0;
+    int ix = (td->ix >= 0 ? td->ix : 0);
+
+    switch (td->type) {
+    case RPM_INT64_TYPE:
+	val = *((uint64_t *) td->data + ix);
+	break;
+    case RPM_INT32_TYPE:
+	val = *((uint32_t *) td->data + ix);
+	break;
+    case RPM_INT16_TYPE:
+	val = *((uint16_t *) td->data + ix);
+	break;
+    case RPM_INT8_TYPE:
+    case RPM_CHAR_TYPE:
+	val = *((uint8_t *) td->data + ix);
+	break;
+    default:
+	break;
+    }
+    return val;
+}
+
 char *rpmtdFormat(rpmtd td, rpmtdFormats fmt, const char *errmsg)
 {
     headerTagFormatFunction func = rpmHeaderFormatFuncByValue(fmt);

lib/rpmtd.h

@@ -185,6 +185,17 @@ uint64_t * rpmtdGetUint64(rpmtd td);
  */
 const char * rpmtdGetString(rpmtd td);
 
+/** \ingroup rpmtd
+ * Return numeric value from tag container.
+ * Returns the value of numeric container (RPM_NUMERIC_CLASS) from
+ * current iteration index as uint64_t regardless of its internal 
+ * presentation (8/16/32/64-bit integer).
+ * @param td		Tag data container
+ * @return		Value of current iteration item as uint64_t,
+ * 			0 for non-numeric types (error)
+ */
+uint64_t rpmtdGetNumber(rpmtd td);
+
 typedef enum rpmtdFormats_e {
     RPMTD_FORMAT_STRING		= 0,	/* plain string (any type) */
     RPMTD_FORMAT_ARMOR		= 1,	/* ascii armor format (bin types) */