From 37677a62c3d4baa4c70cefd9646ba62fd1e62649 Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Sun, 6 Jun 2021 13:51:00 +0200
Subject: Fix restoring a diff image

---
 src/file.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/file.c')

diff --git a/src/file.c b/src/file.c
index 634bb3b..57a847a 100644
--- a/src/file.c
+++ b/src/file.c
@@ -48,3 +48,20 @@ file_size(FILE *const file)
 
     return size;
 }
+
+size_t
+file_read_sectors(FILE *const file, char *const buffer, uint32_t buffer_size,
+                  uint32_t sector_size)
+{
+    const size_t bytes_read = fread(buffer, 1U, buffer_size, file);
+
+    if (ferror(file)) {
+        print_error("cannot read from file: %s", strerror(errno));
+        return 0;
+    } else if ((bytes_read % sector_size) != 0) {
+        print_error("data read from input file is not multiple of sector size");
+        return 0;
+    } else {
+        return (bytes_read / sector_size);
+    }
+}
-- 
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