From d57efdfa0b7420dabf97335ffe3a8b391b9f54b3 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Fri, 20 Sep 2019 16:31:31 +0200
Subject: Remove sqfs reader & fstree usage from sqfsdiff

Replace with direct usage of the dir reader and lower level
data structures.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 difftool/sqfsdiff.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 99 insertions(+), 5 deletions(-)

(limited to 'difftool/sqfsdiff.c')

diff --git a/difftool/sqfsdiff.c b/difftool/sqfsdiff.c
index a661223..6d1a9af 100644
--- a/difftool/sqfsdiff.c
+++ b/difftool/sqfsdiff.c
@@ -6,6 +6,100 @@
  */
 #include "sqfsdiff.h"
 
+static int open_sfqs(sqfs_state_t *state, const char *path)
+{
+	state->file = sqfs_open_file(path, SQFS_FILE_OPEN_READ_ONLY);
+	if (state->file == NULL) {
+		perror(path);
+		return -1;
+	}
+
+	if (sqfs_super_read(&state->super, state->file)) {
+		fprintf(stderr, "error reading super block from %s\n",
+			path);
+		goto fail_file;
+	}
+
+	if (!sqfs_compressor_exists(state->super.compression_id)) {
+		fprintf(stderr, "%s: unknown compressor used.\n",
+			path);
+		goto fail_file;
+	}
+
+	sqfs_compressor_config_init(&state->cfg, state->super.compression_id,
+				    state->super.block_size,
+				    SQFS_COMP_FLAG_UNCOMPRESS);
+
+	state->cmp = sqfs_compressor_create(&state->cfg);
+	if (state->cmp == NULL) {
+		fprintf(stderr, "%s: error creating compressor.\n", path);
+		goto fail_file;
+	}
+
+	if (state->super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
+		if (state->cmp->read_options(state->cmp, state->file)) {
+			fprintf(stderr, "%s: error loading compressor "
+				"options.\n", path);
+			goto fail_cmp;
+		}
+	}
+
+	state->idtbl = sqfs_id_table_create();
+	if (state->idtbl == NULL) {
+		perror("error creating ID table");
+		goto fail_cmp;
+	}
+
+	if (sqfs_id_table_read(state->idtbl, state->file,
+			       &state->super, state->cmp)) {
+		fprintf(stderr, "%s: error loading ID table\n", path);
+		goto fail_id;
+	}
+
+	state->dr = sqfs_dir_reader_create(&state->super, state->cmp,
+					   state->file);
+	if (state->dr == NULL) {
+		perror("creating directory reader");
+		goto fail_dr;
+	}
+
+	if (sqfs_dir_reader_get_full_hierarchy(state->dr, state->idtbl,
+					       NULL, 0, &state->root)) {
+		fprintf(stderr, "%s: error loading file system tree\n", path);
+		goto fail_dr;
+	}
+
+	state->data = data_reader_create(state->file, &state->super,
+					 state->cmp);
+	if (state->data == NULL) {
+		fprintf(stderr, "%s: error loading file system tree\n", path);
+		goto fail_tree;
+	}
+
+	return 0;
+fail_tree:
+	sqfs_dir_tree_destroy(state->root);
+fail_dr:
+	sqfs_dir_reader_destroy(state->dr);
+fail_id:
+	sqfs_id_table_destroy(state->idtbl);
+fail_cmp:
+	state->cmp->destroy(state->cmp);
+fail_file:
+	state->file->destroy(state->file);
+	return -1;
+}
+
+static void close_sfqs(sqfs_state_t *state)
+{
+	data_reader_destroy(state->data);
+	sqfs_dir_tree_destroy(state->root);
+	sqfs_dir_reader_destroy(state->dr);
+	sqfs_id_table_destroy(state->idtbl);
+	state->cmp->destroy(state->cmp);
+	state->file->destroy(state->file);
+}
+
 int main(int argc, char **argv)
 {
 	int status, ret = 0;
@@ -19,10 +113,10 @@ int main(int argc, char **argv)
 			return 2;
 	}
 
-	if (sqfs_reader_open(&sd.sqfs_old, sd.old_path))
+	if (open_sfqs(&sd.sqfs_old, sd.old_path))
 		return 2;
 
-	if (sqfs_reader_open(&sd.sqfs_new, sd.new_path)) {
+	if (open_sfqs(&sd.sqfs_new, sd.new_path)) {
 		status = 2;
 		goto out_sqfs_old;
 	}
@@ -35,7 +129,7 @@ int main(int argc, char **argv)
 		}
 	}
 
-	ret = node_compare(&sd, sd.sqfs_old.fs.root, sd.sqfs_new.fs.root);
+	ret = node_compare(&sd, sd.sqfs_old.root, sd.sqfs_new.root);
 	if (ret != 0)
 		goto out;
 
@@ -53,8 +147,8 @@ out:
 	} else {
 		status = 0;
 	}
-	sqfs_reader_close(&sd.sqfs_new);
+	close_sfqs(&sd.sqfs_new);
 out_sqfs_old:
-	sqfs_reader_close(&sd.sqfs_old);
+	close_sfqs(&sd.sqfs_old);
 	return status;
 }
-- 
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