From bb732b42e32fd301b9248b6e2e9a1bf91b09b163 Mon Sep 17 00:00:00 2001
From: lahm86 <33758420+lahm86@users.noreply.github.com>
Date: Mon, 9 Sep 2024 16:30:19 +0100
Subject: [PATCH] virtual_file: add function to set position

---
 include/libtrx/virtual_file.h | 1 +
 src/virtual_file.c            | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/libtrx/virtual_file.h b/include/libtrx/virtual_file.h
index 1396c63..2d8cb8d 100644
--- a/include/libtrx/virtual_file.h
+++ b/include/libtrx/virtual_file.h
@@ -14,6 +14,7 @@ VFILE *VFile_CreateFromBuffer(const char *data, size_t size);
 void VFile_Close(VFILE *file);
 
 size_t VFile_GetPos(const VFILE *file);
+void VFile_SetPos(VFILE *file, size_t pos);
 void VFile_Skip(VFILE *file, int32_t offset);
 
 void VFile_Read(VFILE *file, void *target, size_t size);
diff --git a/src/virtual_file.c b/src/virtual_file.c
index 26ec2f4..d5c64d0 100644
--- a/src/virtual_file.c
+++ b/src/virtual_file.c
@@ -53,6 +53,14 @@ size_t VFile_GetPos(const VFILE *file)
     return file->cur_ptr - file->content;
 }
 
+void VFile_SetPos(VFILE *file, const size_t pos)
+{
+    const size_t cur_pos = VFile_GetPos(file);
+    const int32_t offset = pos - cur_pos;
+    assert(cur_pos + offset <= file->size);
+    file->cur_ptr += offset;
+}
+
 void VFile_Skip(VFILE *file, int32_t offset)
 {
     const size_t cur_pos = VFile_GetPos(file);