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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-04-27 11:59:02 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-04-27 11:59:02 +0200
commit20b0d509f67dea802706cd6b80b5e20d14988931 (patch)
tree3a87ea358b1206f6823777693d109896d6908283 /bin/sqfsdiff/compare_files.c
parent9e332a2d3eddcc262476ac263e03df021b3c44b4 (diff)
Cleanup directory structure of the binary programs
Instead of having the binary programs in randomly named subdirectories, move all of them to a "bin" subdirectory, similar to the utility libraries that have subdirectories within "lib" and give the subdirectories the propper names (e.g. have gensquashfs source in a directory *actually* named "gensquashfs"). Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'bin/sqfsdiff/compare_files.c')
-rw-r--r--bin/sqfsdiff/compare_files.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/bin/sqfsdiff/compare_files.c b/bin/sqfsdiff/compare_files.c
new file mode 100644
index 0000000..51b66bb
--- /dev/null
+++ b/bin/sqfsdiff/compare_files.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * compare_files.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfsdiff.h"
+
+static unsigned char old_buf[MAX_WINDOW_SIZE];
+static unsigned char new_buf[MAX_WINDOW_SIZE];
+
+static int read_blob(const char *prefix, const char *path,
+ sqfs_data_reader_t *rd, const sqfs_inode_generic_t *inode,
+ void *buffer, sqfs_u64 offset, size_t size)
+{
+ ssize_t ret;
+
+ ret = sqfs_data_reader_read(rd, inode, offset, buffer, size);
+ ret = (ret < 0 || (size_t)ret < size) ? -1 : 0;
+
+ if (ret) {
+ fprintf(stderr, "Failed to read %s from %s\n",
+ path, prefix);
+ return -1;
+ }
+
+ return 0;
+}
+
+int compare_files(sqfsdiff_t *sd, const sqfs_inode_generic_t *old,
+ const sqfs_inode_generic_t *new, const char *path)
+{
+ sqfs_u64 offset, diff, oldsz, newsz;
+ int status = 0, ret;
+
+ sqfs_inode_get_file_size(old, &oldsz);
+ sqfs_inode_get_file_size(new, &newsz);
+
+ if (oldsz != newsz)
+ goto out_different;
+
+ if (sd->compare_flags & COMPARE_NO_CONTENTS)
+ return 0;
+
+ for (offset = 0; offset < oldsz; offset += diff) {
+ diff = oldsz - offset;
+
+ if (diff > MAX_WINDOW_SIZE)
+ diff = MAX_WINDOW_SIZE;
+
+ ret = read_blob(sd->old_path, path,
+ sd->sqfs_old.data, old, old_buf, offset, diff);
+ if (ret)
+ return -1;
+
+ ret = read_blob(sd->new_path, path,
+ sd->sqfs_new.data, new, new_buf, offset, diff);
+ if (ret)
+ return -1;
+
+ if (memcmp(old_buf, new_buf, diff) != 0)
+ goto out_different;
+ }
+
+ return status;
+out_different:
+ if (sd->compare_flags & COMPARE_EXTRACT_FILES) {
+ if (extract_files(sd, old, new, path))
+ return -1;
+ }
+ return 1;
+}