virtual_file: add function to set position

LostArtefacts · Sep 9, 2024 · bb732b4 · bb732b4
1 parent d23bb2a
commit bb732b4
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diff --git 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
@@ -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);