1 files changed, 135 insertions, 0 deletions
diff --git a/subversion/libsvn_fs_x/id.h b/subversion/libsvn_fs_x/id.h
new file mode 100644
index 0000000..e584043
--- /dev/null
+++ b/subversion/libsvn_fs_x/id.h
@@ -0,0 +1,135 @@
+/* id.h : interface to FSX-internal ID functions
+ *
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you under the Apache License, Version 2.0 (the
+ *    "License"); you may not use this file except in compliance
+ *    with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ */
+
+#ifndef SVN_LIBSVN_FS_X_ID_H
+#define SVN_LIBSVN_FS_X_ID_H
+
+#include "svn_fs.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Unique identifier for a transaction within the given repository. */
+typedef apr_int64_t svn_fs_x__txn_id_t;
+
+/* svn_fs_x__txn_id_t value for everything that is not a transaction. */
+#define SVN_FS_X__INVALID_TXN_ID ((svn_fs_x__txn_id_t)(-1))
+
+/* Change set is the umbrella term for transaction and revision in FSX.
+ * Revision numbers (>=0) map 1:1 onto change sets while txns are mapped
+ * onto the negatve value range. */
+typedef apr_int64_t svn_fs_x__change_set_t;
+
+/* Invalid / unused change set number. */
+#define SVN_FS_X__INVALID_CHANGE_SET  ((svn_fs_x__change_set_t)(-1))
+
+/* Return TRUE iff the CHANGE_SET refers to a revision
+   (will return FALSE for SVN_INVALID_REVNUM). */
+svn_boolean_t
+svn_fs_x__is_revision(svn_fs_x__change_set_t change_set);
+
+/* Return TRUE iff the CHANGE_SET refers to a transaction
+   (will return FALSE for SVN_FS_X__INVALID_TXN_ID). */
+svn_boolean_t
+svn_fs_x__is_txn(svn_fs_x__change_set_t change_set);
+
+/* Return the revision number that corresponds to CHANGE_SET.
+   Will SVN_INVALID_REVNUM for transactions. */
+svn_revnum_t
+svn_fs_x__get_revnum(svn_fs_x__change_set_t change_set);
+
+/* Return the transaction ID that corresponds to CHANGE_SET.
+   Will SVN_FS_X__INVALID_TXN_ID for revisions. */
+svn_fs_x__txn_id_t
+svn_fs_x__get_txn_id(svn_fs_x__change_set_t change_set);
+
+/* Convert REVNUM into a change set number */
+svn_fs_x__change_set_t
+svn_fs_x__change_set_by_rev(svn_revnum_t revnum);
+
+/* Convert TXN_ID into a change set number */
+svn_fs_x__change_set_t
+svn_fs_x__change_set_by_txn(svn_fs_x__txn_id_t txn_id);
+
+/* An ID in FSX consists of a creation CHANGE_SET number and some changeset-
+ * local counter value (NUMBER).
+ */
+typedef struct svn_fs_x__id_t
+{
+  svn_fs_x__change_set_t change_set;
+
+  apr_uint64_t number;
+} svn_fs_x__id_t;
+
+
+/*** Operations on ID parts. ***/
+
+/* Return TRUE, if both elements of the PART is 0, i.e. this is the default
+ * value if e.g. no copies were made of this node. */
+svn_boolean_t
+svn_fs_x__id_is_root(const svn_fs_x__id_t *part);
+
+/* Return TRUE, if all element values of *LHS and *RHS match. */
+svn_boolean_t
+svn_fs_x__id_eq(const svn_fs_x__id_t *lhs,
+                const svn_fs_x__id_t *rhs);
+
+/* Parse the NUL-terminated ID part at DATA and write the result into *PART.
+ */
+svn_error_t *
+svn_fs_x__id_parse(svn_fs_x__id_t *part,
+                   const char *data);
+
+/* Convert ID into string form, allocated in RESULT_POOL. */
+svn_string_t *
+svn_fs_x__id_unparse(const svn_fs_x__id_t*id,
+                     apr_pool_t *result_pool);
+
+/* Set *PART to "unused". */
+void
+svn_fs_x__id_reset(svn_fs_x__id_t *part);
+
+/* Return TRUE if *PART is belongs to either a revision or transaction. */
+svn_boolean_t
+svn_fs_x__id_used(const svn_fs_x__id_t *part);
+
+/* Return 0 if A and B are equal, 1 if A is "greater than" B, -1 otherwise. */
+int
+svn_fs_x__id_compare(const svn_fs_x__id_t *a,
+                     const svn_fs_x__id_t *b);
+
+/* Set *NODEREV_ID to the root node ID of transaction TXN_ID. */
+void
+svn_fs_x__init_txn_root(svn_fs_x__id_t *noderev_id,
+                        svn_fs_x__txn_id_t txn_id);
+
+/* Set *NODEREV_ID to the root node ID of revision REV. */
+void
+svn_fs_x__init_rev_root(svn_fs_x__id_t *noderev_id,
+                        svn_revnum_t rev);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_LIBSVN_FS_X_ID_H */