1 files changed, 88 insertions, 0 deletions
diff --git a/lib/common/statistics.c b/lib/common/statistics.c
new file mode 100644
index 0000000..a209461
--- /dev/null
+++ b/lib/common/statistics.c
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * statistics.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "common.h"
+
+#include <stdio.h>
+
+static void post_block_write(void *user, const sqfs_block_t *block,
+			     sqfs_file_t *file)
+{
+	data_writer_stats_t *stats = user;
+	(void)file;
+
+	if (block->size == 0)
+		return;
+
+	if (block->flags & SQFS_BLK_FRAGMENT_BLOCK) {
+		stats->frag_blocks_written += 1;
+	} else {
+		stats->blocks_written += 1;
+	}
+
+	stats->bytes_written += block->size;
+}
+
+static void pre_fragment_store(void *user, sqfs_block_t *block)
+{
+	data_writer_stats_t *stats = user;
+	(void)block;
+
+	stats->frag_count += 1;
+}
+
+static void notify_blocks_erased(void *user, size_t count, sqfs_u64 bytes)
+{
+	data_writer_stats_t *stats = user;
+
+	stats->bytes_written -= bytes;
+	stats->blocks_written -= count;
+	stats->duplicate_blocks += count;
+}
+
+static void notify_fragment_discard(void *user, const sqfs_block_t *block)
+{
+	data_writer_stats_t *stats = user;
+	(void)block;
+
+	stats->frag_dup += 1;
+}
+
+static const sqfs_block_hooks_t hooks = {
+	.size = sizeof(hooks),
+	.post_block_write = post_block_write,
+	.pre_fragment_store = pre_fragment_store,
+	.notify_blocks_erased = notify_blocks_erased,
+	.notify_fragment_discard = notify_fragment_discard,
+};
+
+void register_stat_hooks(sqfs_data_writer_t *data, data_writer_stats_t *stats)
+{
+	sqfs_data_writer_set_hooks(data, stats, &hooks);
+}
+
+void sqfs_print_statistics(sqfs_super_t *super, data_writer_stats_t *stats)
+{
+	size_t ratio;
+
+	if (stats->bytes_written > 0) {
+		ratio = (100 * stats->bytes_written) / stats->bytes_read;
+	} else {
+		ratio = 100;
+	}
+
+	fputs("---------------------------------------------------\n", stdout);
+	printf("Input files processed: %zu\n", stats->file_count);
+	printf("Data blocks actually written: %zu\n", stats->blocks_written);
+	printf("Fragment blocks written: %zu\n", stats->frag_blocks_written);
+	printf("Duplicate data blocks omitted: %zu\n", stats->duplicate_blocks);
+	printf("Sparse blocks omitted: %zu\n", stats->sparse_blocks);
+	printf("Fragments actually written: %zu\n", stats->frag_count);
+	printf("Duplicated fragments omitted: %zu\n", stats->frag_dup);
+	printf("Total number of inodes: %u\n", super->inode_count);
+	printf("Number of unique group/user IDs: %u\n", super->id_count);
+	printf("Data compression ratio: %zu%%\n", ratio);
+}