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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-21 12:23:01 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-21 12:24:06 +0200
commite14ffcf8e092758bc21d0d5c795b58ea0b1773f2 (patch)
tree3359d1e5939982a9695330c2dbf74e1609f28728 /difftool/compare_files.c
parenta7d22b83cf70eb500f52edb625e9c719a35b0134 (diff)
Merge functionality of file on disk and file in sqfs compare functions
Moving towards unified sqfs vs sqfs, sqfs vs dir, dir vs sqfs comparisions. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'difftool/compare_files.c')
-rw-r--r--difftool/compare_files.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/difftool/compare_files.c b/difftool/compare_files.c
new file mode 100644
index 0000000..89c5f5c
--- /dev/null
+++ b/difftool/compare_files.c
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * compare_files.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "difftool.h"
+
+static unsigned char a_buf[MAX_WINDOW_SIZE];
+static unsigned char b_buf[MAX_WINDOW_SIZE];
+
+int compare_files(file_info_t *a, file_info_t *b, const char *path)
+{
+ char second_name[strlen(second_path) + strlen(path) + 2];
+ char first_name[strlen(first_path) + strlen(path) + 2];
+ int afd = -1, bfd = -1, status = 0;
+ uint64_t offset, diff;
+ ssize_t ret;
+
+ if (a->size != b->size)
+ goto out_different;
+
+ if (compare_flags & COMPARE_NO_CONTENTS)
+ return 0;
+
+ if (a_is_dir) {
+ sprintf(first_name, "%s/%s", first_path, path);
+
+ afd = open(first_name, O_RDONLY);
+ if (afd < 0) {
+ perror(first_name);
+ goto fail;
+ }
+ }
+
+ if (b_is_dir) {
+ sprintf(second_name, "%s/%s", second_path, path);
+
+ bfd = open(second_name, O_RDONLY);
+ if (bfd < 0) {
+ perror(second_name);
+ goto fail;
+ }
+ }
+
+ for (offset = 0; offset < a->size; offset += diff) {
+ diff = a->size - offset;
+
+ if (diff > MAX_WINDOW_SIZE)
+ diff = MAX_WINDOW_SIZE;
+
+ if (a_is_dir) {
+ if (read_data_at(first_name, offset, afd, a_buf, diff))
+ goto out;
+ } else {
+ ret = data_reader_read(sqfs_a.data, a, offset,
+ a_buf, diff);
+ if (ret < 0 || (size_t)ret < diff) {
+ fprintf(stderr, "Failed to read %s from %s\n",
+ path, first_path);
+ return -1;
+ }
+ }
+
+ if (b_is_dir) {
+ if (read_data_at(second_name, offset, bfd, b_buf, diff))
+ goto out;
+ } else {
+ ret = data_reader_read(sqfs_b.data, b, offset,
+ b_buf, diff);
+ if (ret < 0 || (size_t)ret < diff) {
+ fprintf(stderr, "Failed to read %s from %s\n",
+ path, second_path);
+ return -1;
+ }
+ }
+
+ if (memcmp(a_buf, b_buf, diff) != 0)
+ goto out_different;
+ }
+out:
+ if (afd >= 0)
+ close(afd);
+ if (bfd >= 0)
+ close(bfd);
+ return status;
+fail:
+ status = -1;
+ goto out;
+out_different:
+ if (compare_flags & COMPARE_EXTRACT_FILES) {
+ if (extract_files(a, b, path))
+ goto fail;
+ }
+ status = 1;
+ goto out;
+}