Add fs_read and fs_write functions and some testing

1 files changed, 15 insertions, 0 deletions

diff --git a/src/filesystem.c b/src/filesystem.c
index 2da77be..1521d69 100644
--- a/src/filesystem.c
+++ b/src/filesystem.c
@@ -116,3 +116,18 @@ fs_write(u8 *src, size_t n_bytes, u16 file_index, u16 offset, bool append) {
 
     return n_bytes;
 }
+
+int
+fs_read(u8 *dst, size_t n_bytes, u16 file_index, u16 offset) {
+    File *file = &filesystem.files[file_index];
+
+    // Check if the offset is within limits.
+    if (offset + n_bytes >= FILE_MAX_SIZE) {
+        return -1;
+    }
+
+    // Copy n_bytes to destination.
+    _fs_read(dst, FILE_DATA_OFFSET + FILE_MAX_SIZE * file_index + offset, n_bytes);
+
+    return n_bytes;
+}