diff -r c065d196a2c8 -r 06091e067bee src/buffer.c
--- a/src/buffer.c	Fri Dec 20 13:13:38 2024 +0100
+++ b/src/buffer.c	Fri Dec 20 15:00:05 2024 +0100
@@ -83,6 +83,7 @@
     if (buffer->flags & CX_BUFFER_FREE_CONTENTS) {
         cxFree(buffer->allocator, buffer->bytes);
     }
+    memset(buffer, 0, sizeof(CxBuffer));
 }
 
 CxBuffer *cxBufferCreate(
@@ -106,8 +107,9 @@
 
 void cxBufferFree(CxBuffer *buffer) {
     if (buffer == NULL) return;
+    const CxAllocator *allocator = buffer->allocator;
     cxBufferDestroy(buffer);
-    cxFree(buffer->allocator, buffer);
+    cxFree(allocator, buffer);
 }
 
 int cxBufferSeek(
@@ -331,6 +333,19 @@
 
 }
 
+size_t cxBufferAppend(
+        const void *ptr,
+        size_t size,
+        size_t nitems,
+        CxBuffer *buffer
+) {
+    size_t pos = buffer->pos;
+    buffer->pos = buffer->size;
+    size_t written = cxBufferWrite(ptr, size, nitems, buffer);
+    buffer->pos = pos;
+    return written;
+}
+
 int cxBufferPut(
         CxBuffer *buffer,
         int c