From abb4f60f8a5166dd446318e0fb4b2df0c4b9ab02 Mon Sep 17 00:00:00 2001
From: Dirk Engling <erdgeist@erdgeist.org>
Date: Sat, 24 Oct 2026 12:53:05 +0200
Subject: Add tiny blob wrapper, holding ptr+size, optimized to grow and reset

---
 ot_buf.c | 41 +++++++++++++++++++++++++++++++++++++++++
 ot_buf.h | 27 +++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 ot_buf.c
 create mode 100644 ot_buf.h

diff --git a/ot_buf.c b/ot_buf.c
new file mode 100644
index 0000000..eb00edf
--- /dev/null
+++ b/ot_buf.c
@@ -0,0 +1,41 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever.
+
+   $id$ */
+
+/* System */
+#include <stdlib.h>
+#include <string.h>
+
+/* Opentracker */
+#include "ot_buf.h"
+
+int buf_cat(ot_buf *buf, const void *src, size_t len) {
+  char *data;
+
+  if (!len)
+    return 0;
+
+  if (buf->size + len < buf->size)
+    return -1;
+
+  if (!(data = realloc(buf->data, buf->size + len)))
+    return -1;
+
+  buf->data = data;
+  memcpy(data + buf->size, src, len);
+  buf->size += len;
+
+  return 0;
+}
+
+void buf_truncate(ot_buf *buf, size_t len) {
+  if (len < buf->size)
+    buf->size = len;
+}
+
+void buf_reset(ot_buf *buf) {
+  free(buf->data);
+  buf->data = NULL;
+  buf->size = 0;
+}
diff --git a/ot_buf.h b/ot_buf.h
new file mode 100644
index 0000000..219a069
--- /dev/null
+++ b/ot_buf.h
@@ -0,0 +1,27 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever.
+
+   $id$ */
+
+#ifndef OT_BUF_H__
+#define OT_BUF_H__
+
+#include <stddef.h>
+
+/* A growable byte buffer, holding an HTTP request that did not arrive in a
+   single packet. Requests that arrive whole are served straight from the
+   worker's input buffer and never come near this. */
+typedef struct {
+  char  *data;
+  size_t size;
+} ot_buf;
+
+/* Append len bytes from src. Returns 0, or -1 if the memory could not be
+   had, in which case the buffer keeps whatever it already held. */
+int buf_cat(ot_buf *buf, const void *src, size_t len);
+
+void buf_truncate(ot_buf *buf, size_t len);
+
+void buf_reset(ot_buf *buf);
+
+#endif
-- 
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