thodg/got

diff --git a/lib/got_index_priv.h b/lib/got_index_priv.h
new file mode 100644
index 0000000..a36fa90
--- /dev/null
+++ b/lib/got_index_priv.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* 
+ * Meta data about a tracked on-disk file.
+ *
+ * Note that some fields are truncated results from stat(2). These are only
+ * used in order to detect modifications made to on-disk files, they are
+ * never written back to the filesystem.
+ */
+struct got_index_entry {
+	uint32_t ctime_sec;
+	uint32_t ctime_nsec;
+	uint32_t mtime_sec;
+	uint32_t mtime_nsec;
+	uint32_t dev;
+	uint32_t ino;
+	uint32_t mode;
+#define GOT_INDEX_ENTRY_MODE_OBJ_TYPE	0x0000000f
+#define GOT_INDEX_ENTRY_MODE_PERMS	0x0000ff10
+	uint32_t uid;
+	uint32_t gid;
+	uint32_t size;
+	uint8_t obj_sha1[SHA1_DIGEST_LENGTH];
+	uint16_t flags;
+#define GOT_INDEX_ENTRY_F_NAME_LEN	0x0fff
+#define GOT_INDEX_ENTRY_F_STAGE		0x3000
+#define GOT_INDEX_ENTRY_F_EXTENDED	0x4000
+#define GOT_INDEX_ENTRY_F_ASSUME_VALID	0x8000
+	uint16_t ext_flags; /*  if F_EXTENDED set in version 3 or later */
+#define GOT_INDEX_ENTRY_EXT_F_UNUSED		0x1fff
+#define GOT_INDEX_ENTRY_EXT_F_INTEND_TO_ADD	0x2000
+#define GOT_INDEX_ENTRY_EXT_F_SKIP_WORKTREE	0x4000
+#define GOT_INDEX_ENTRY_EXT_F_RESERVED		0x8000
+
+	/* 
+	 * This is a unix-style path relative to top level directory.
+	 * In version 4 it is prefix-compressed relative to previous entry.
+	 */
+	const char *path;
+
+	/* In versions < 4, path is NUL-padded to a multple of eight bytes. */
+};
+
+struct got_index {
+	uint32_t signature;
+	uint32_t version;
+	uint32_t nentries;
+	struct got_index_entry *entries;
+	/* extensions go here */
+	uint8_t sha1[SHA1_DIGEST_LENGTH];
+};