1 files changed, 48 insertions, 0 deletions
diff --git a/include/sqfs/id_table.h b/include/sqfs/id_table.h
new file mode 100644
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--- /dev/null
+++ b/include/sqfs/id_table.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * id_table.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef ID_TABLE_H
+#define ID_TABLE_H
+
+#include "config.h"
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include "compress.h"
+
+/* Encapsulates the ID table used by SquashFS */
+typedef struct {
+	/* Array of unique 32 bit IDs */
+	uint32_t *ids;
+
+	/* Number of 32 bit IDs stored in the array */
+	size_t num_ids;
+
+	/* Actual size of the array, i.e. maximum available */
+	size_t max_ids;
+} id_table_t;
+
+/* Returns 0 on success. Prints error message to stderr on failure. */
+int id_table_init(id_table_t *tbl);
+
+void id_table_cleanup(id_table_t *tbl);
+
+/* Resolve a 32 bit to a 16 bit table index.
+   Returns 0 on success. Internally prints errors to stderr. */
+int id_table_id_to_index(id_table_t *tbl, uint32_t id, uint16_t *out);
+
+/* Write an ID table to a SquashFS image.
+   Returns 0 on success. Internally prints error message to stderr. */
+int id_table_write(id_table_t *tbl, int outfd, sqfs_super_t *super,
+		   compressor_t *cmp);
+
+/* Read an ID table from a SquashFS image.
+   Returns 0 on success. Internally prints error messages to stderr. */
+int id_table_read(id_table_t *tbl, int fd, sqfs_super_t *super,
+		  compressor_t *cmp);
+
+#endif /* ID_TABLE_H */