1 files changed, 125 insertions, 0 deletions
diff --git a/bin/rdsquashfs/describe.c b/bin/rdsquashfs/describe.c
new file mode 100644
index 0000000..d30f844
--- /dev/null
+++ b/bin/rdsquashfs/describe.c
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * describe.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "rdsquashfs.h"
+
+static int print_name(const sqfs_tree_node_t *n)
+{
+	char *start, *ptr, *name = sqfs_tree_node_get_path(n);
+	int ret;
+
+	if (name == NULL) {
+		perror("Recovering file path of tree node");
+		return -1;
+	}
+
+	ret = canonicalize_name(name);
+	assert(ret == 0);
+
+	if (strchr(name, ' ') == NULL && strchr(name, '"') == NULL) {
+		fputs(name, stdout);
+	} else {
+		fputc('"', stdout);
+
+		ptr = strchr(name, '"');
+
+		if (ptr != NULL) {
+			start = name;
+
+			do {
+				fwrite(start, 1, ptr - start, stdout);
+				fputs("\\\"", stdout);
+				start = ptr + 1;
+				ptr = strchr(start, '"');
+			} while (ptr != NULL);
+
+			fputs(start, stdout);
+		} else {
+			fputs(name, stdout);
+		}
+
+		fputc('"', stdout);
+	}
+
+	free(name);
+	return 0;
+}
+
+static void print_perm(const sqfs_tree_node_t *n)
+{
+	printf(" 0%o %d %d", n->inode->base.mode & (~S_IFMT), n->uid, n->gid);
+}
+
+static int print_simple(const char *type, const sqfs_tree_node_t *n,
+			const char *extra)
+{
+	printf("%s ", type);
+	if (print_name(n))
+		return -1;
+	print_perm(n);
+	if (extra != NULL)
+		printf(" %s", extra);
+	fputc('\n', stdout);
+	return 0;
+}
+
+int describe_tree(const sqfs_tree_node_t *root, const char *unpack_root)
+{
+	const sqfs_tree_node_t *n;
+
+	switch (root->inode->base.mode & S_IFMT) {
+	case S_IFSOCK:
+		return print_simple("sock", root, NULL);
+	case S_IFLNK:
+		return print_simple("slink", root,
+				    (const char *)root->inode->extra);
+	case S_IFIFO:
+		return print_simple("pipe", root, NULL);
+	case S_IFREG:
+		if (unpack_root == NULL)
+			return print_simple("file", root, NULL);
+
+		fputs("file ", stdout);
+		if (print_name(root))
+			return -1;
+		print_perm(root);
+		printf(" %s/", unpack_root);
+		if (print_name(root))
+			return -1;
+		fputc('\n', stdout);
+		break;
+	case S_IFCHR:
+	case S_IFBLK: {
+		char buffer[32];
+		sqfs_u32 devno;
+
+		if (root->inode->base.type == SQFS_INODE_EXT_BDEV ||
+		    root->inode->base.type == SQFS_INODE_EXT_CDEV) {
+			devno = root->inode->data.dev_ext.devno;
+		} else {
+			devno = root->inode->data.dev.devno;
+		}
+
+		sprintf(buffer, "%c %d %d",
+			S_ISCHR(root->inode->base.mode) ? 'c' : 'b',
+			major(devno), minor(devno));
+		return print_simple("nod", root, buffer);
+	}
+	case S_IFDIR:
+		if (root->name[0] != '\0') {
+			if (print_simple("dir", root, NULL))
+				return -1;
+		}
+
+		for (n = root->children; n != NULL; n = n->next) {
+			if (describe_tree(n, unpack_root))
+				return -1;
+		}
+		break;
+	}
+
+	return 0;
+}