1 files changed, 14 insertions, 0 deletions
diff --git a/src/memblock.c b/src/memblock.c
index 067243c5..79fe2977 100644
--- a/src/memblock.c
+++ b/src/memblock.c
@@ -78,3 +78,17 @@ void memblock_unref_fixed(struct memblock *b) {
     b->type = MEMBLOCK_DYNAMIC;
 }
 
+void memchunk_make_writable(struct memchunk *c) {
+    struct memblock *n;
+    assert(c && c->memblock && c->memblock->ref >= 1);
+
+    if (c->memblock->ref == 1)
+        return;
+    
+    n = memblock_new(c->length);
+    assert(n);
+    memcpy(n->data, c->memblock->data+c->index, c->length);
+    memblock_unref(c->memblock);
+    c->memblock = n;
+    c->index = 0;
+}