libsqfs: move dir reader code to sub directory, add internal header

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 82 insertions, 0 deletions

diff --git a/lib/sqfs/dir_reader/find_by_path.c b/lib/sqfs/dir_reader/find_by_path.c
new file mode 100644
index 0000000..0cd800f
--- /dev/null
+++ b/lib/sqfs/dir_reader/find_by_path.c
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * find_by_path.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+int sqfs_dir_reader_find_by_path(sqfs_dir_reader_t *rd,
+				 const sqfs_inode_generic_t *start,
+				 const char *path, sqfs_inode_generic_t **out)
+{
+	sqfs_inode_generic_t *inode;
+	sqfs_dir_entry_t *ent;
+	const char *ptr;
+	int ret = 0;
+
+	if (start == NULL) {
+		ret = sqfs_dir_reader_get_root_inode(rd, &inode);
+	} else {
+		inode = alloc_flex(sizeof(*inode), 1,
+				   start->payload_bytes_used);
+		if (inode == NULL) {
+			ret = SQFS_ERROR_ALLOC;
+		} else {
+			memcpy(inode, start,
+			       sizeof(*start) + start->payload_bytes_used);
+		}
+	}
+
+	if (ret)
+		return ret;
+
+	while (*path != '\0') {
+		if (*path == '/') {
+			while (*path == '/')
+				++path;
+			continue;
+		}
+
+		ret = sqfs_dir_reader_open_dir(rd, inode, 0);
+		free(inode);
+		if (ret)
+			return ret;
+
+		ptr = strchr(path, '/');
+		if (ptr == NULL) {
+
+			if (ptr == NULL) {
+				for (ptr = path; *ptr != '\0'; ++ptr)
+					;
+			}
+		}
+
+		do {
+			ret = sqfs_dir_reader_read(rd, &ent);
+			if (ret < 0)
+				return ret;
+
+			if (ret == 0) {
+				ret = strncmp((const char *)ent->name,
+					      path, ptr - path);
+				if (ret == 0)
+					ret = ent->name[ptr - path];
+				free(ent);
+			}
+		} while (ret < 0);
+
+		if (ret > 0)
+			return SQFS_ERROR_NO_ENTRY;
+
+		ret = sqfs_dir_reader_get_inode(rd, &inode);
+		if (ret)
+			return ret;
+
+		path = ptr;
+	}
+
+	*out = inode;
+	return 0;
+}