Add methods to construct tag containers from argv and argi arrays

- basic type checking done based on tag (return) type

lib/rpmtd.c

@@ -52,6 +52,12 @@ rpmTag rpmtdTag(rpmtd td)
     return td->tag;
 }
 
+rpmTagType rpmtdType(rpmtd td)
+{
+    assert(td != NULL);
+    return td->type;
+}
+
 int rpmtdInit(rpmtd td)
 {
     assert(td != NULL);
@@ -91,3 +97,38 @@ const char * rpmtdGetString(rpmtd td)
     } 
     return str;
 }
+
+int rpmtdFromArgv(rpmtd td, rpmTag tag, ARGV_t argv)
+{
+    int count = argvCount(argv);
+    rpmTagType type = rpmTagGetType(tag) & RPM_MASK_TYPE;
+
+    if (type != RPM_STRING_ARRAY_TYPE || count < 1)
+	return 0;
+
+    assert(td != NULL);
+    rpmtdReset(td);
+    td->type = type;
+    td->tag = tag;
+    td->count = count;
+    td->data = argv;
+    return 1;
+}
+
+int rpmtdFromArgi(rpmtd td, rpmTag tag, ARGI_t argi)
+{
+    int count = argiCount(argi);
+    rpmTagType type = rpmTagGetType(tag) & RPM_MASK_TYPE;
+    rpmTagReturnType retype = rpmTagGetType(tag) & RPM_MASK_RETURN_TYPE;
+
+    if (type != RPM_INT32_TYPE || retype != RPM_ARRAY_RETURN_TYPE || count < 1)
+	return 0;
+
+    assert(td != NULL);
+    rpmtdReset(td);
+    td->type = type;
+    td->tag = tag;
+    td->count = count;
+    td->data = argiData(argi);
+    return 1;
+}

lib/rpmtd.h

@@ -2,6 +2,7 @@
 #define _RPMTD_H
 
 #include <rpm/rpmtypes.h>
+#include <rpm/argv.h>
 
 /** \ingroup rpmtd
  * Container for rpm tag data (from headers or extensions).
@@ -56,6 +57,13 @@ rpm_count_t rpmtdCount(rpmtd td);
  */
 rpmTag rpmtdTag(rpmtd td);
 
+/** \ingroup rpmtd
+ * Retrieve type of the container.
+ * @param td		Tag data container
+ * @return		Rpm tag type.
+ */
+rpmTagType rpmtdType(rpmtd td);
+
 /** \ingroup rpmtd
  * Initialize tag container for iteration
  * @param td		Tag data container
@@ -80,4 +88,26 @@ int rpmtdNext(rpmtd td);
  */
 const char * rpmtdGetString(rpmtd td);
 
+/** \ingroup rpmtd
+ * Construct tag container from ARGV_t array.
+ * Tag type is checked to be of string array type and array is checked
+ * to be non-empty.
+ * @param td		Tag data container
+ * @param tag		Rpm tag to construct
+ * @param argv		ARGV array
+ * @return		1 on success, 0 on error (eg wrong type)
+ */
+int rpmtdFromArgv(rpmtd td, rpmTag tag, ARGV_t argv);
+
+/** \ingroup rpmtd
+ * Construct tag container from ARGI_t array.
+ * Tag type is checked to be of integer array type and array is checked
+ * to be non-empty.
+ * @param td		Tag data container
+ * @param tag		Rpm tag to construct
+ * @param argi		ARGI array
+ * @return		1 on success, 0 on error (eg wrong type)
+ */
+int rpmtdFromArgi(rpmtd td, rpmTag tag, ARGI_t argi);
+
 #endif /* _RPMTD_H */