Introduce rpm tag "classes"

- rpm tag data can be either numeric, strings or binary data, each with
  their own "subclasses" (different sized integers etc), add new
  enumeration for these
- add rpmTagGetClass(), rpmtdClass() public functions for retrieving the
  base class of tag and container
- useful for getting a basic idea how to handle tag/container data

4 files changed, 57 insertions, 0 deletions

diff --git a/lib/rpmtag.h b/lib/rpmtag.h
index efcbd0088..335d413da 100644
--- a/lib/rpmtag.h
+++ b/lib/rpmtag.h
@@ -330,6 +330,16 @@ typedef enum rpmTagType_e {
 #define RPM_MASK_TYPE		0x0000ffff
 } rpmTagType;
 
+/** \ingroup rpmtag
+ * The classes of data in tags from headers.
+ */
+typedef enum rpmTagClass_e {
+    RPM_NULL_CLASS	= 0,
+    RPM_NUMERIC_CLASS	= 1,
+    RPM_STRING_CLASS	= 2,
+    RPM_BINARY_CLASS	= 3,
+} rpmTagClass;
+
 /** \ingroup header
  * New rpm data types under consideration/development.
  * These data types may (or may not) be added to rpm at some point. In order
@@ -374,6 +384,13 @@ const char * rpmTagGetName(rpmTag tag);
 rpmTagType rpmTagGetType(rpmTag tag);
 
 /** \ingroup rpmtag
+ * Return tag data class from value.
+ * @param tag		tag value
+ * @return		tag data class, RPM_NULL_CLASS on not found.
+ */
+rpmTagClass rpmTagGetClass(rpmTag tag);
+
+/** \ingroup rpmtag
  * Return tag value from name.
  * @param tagstr	name of tag
  * @return		tag value, -1 on not found
diff --git a/lib/rpmtd.c b/lib/rpmtd.c
index a3fb0a09d..5c7378d5d 100644
--- a/lib/rpmtd.c
+++ b/lib/rpmtd.c
@@ -71,6 +71,12 @@ rpmTagType rpmtdType(rpmtd td)
     return td->type;
 }
 
+rpmTagClass rpmtdClass(rpmtd td)
+{
+    assert(td != NULL);
+    return rpmTagGetClass(td->tag);
+}
+
 int rpmtdGetIndex(rpmtd td)
 {
     assert(td != NULL);
diff --git a/lib/rpmtd.h b/lib/rpmtd.h
index 0ca711fdf..e8ba737e2 100644
--- a/lib/rpmtd.h
+++ b/lib/rpmtd.h
@@ -77,6 +77,13 @@ rpmTag rpmtdTag(rpmtd td);
 rpmTagType rpmtdType(rpmtd td);
 
 /** \ingroup rpmtd
+ * Retrieve class of the container.
+ * @param td		Tag data container
+ * @return		Rpm tag class
+ */
+rpmTagClass rpmtdClass(rpmtd td);
+
+/** \ingroup rpmtd
  * Retrieve current iteration index of the container.
  * @param td		Tag data container
  * @return		Iteration index (or -1 if not iterating)
diff --git a/lib/tagname.c b/lib/tagname.c
index 2a844d656..a81424dfa 100644
--- a/lib/tagname.c
+++ b/lib/tagname.c
@@ -294,6 +294,33 @@ rpmTagType rpmTagGetType(rpmTag tag)
     return ((*rpmTags->tagType)(tag));
 }
 
+rpmTagClass rpmTagGetClass(rpmTag tag)
+{
+    rpmTagClass class;
+    switch (rpmTagGetType(tag) & RPM_MASK_TYPE) {
+    case RPM_CHAR_TYPE:
+    case RPM_INT8_TYPE:
+    case RPM_INT16_TYPE:
+    case RPM_INT32_TYPE:
+    case RPM_INT64_TYPE:
+	class = RPM_NUMERIC_CLASS;
+	break;
+    case RPM_STRING_TYPE:
+    case RPM_STRING_ARRAY_TYPE:
+    case RPM_I18NSTRING_TYPE:
+	class = RPM_STRING_CLASS;
+	break;
+    case RPM_BIN_TYPE:
+	class = RPM_BINARY_CLASS;
+	break;
+    case RPM_NULL_TYPE:
+    default:
+	class = RPM_NULL_CLASS;
+	break;
+    }
+    return class;
+}
+
 rpmTag rpmTagGetValue(const char * tagstr)
 {
     return ((*rpmTags->tagValue)(tagstr));