From b1ce1927022d374198441afafeb27199fc8a052a Mon Sep 17 00:00:00 2001
From: eunhhu <necpition205@gmail.com>
Date: Thu, 24 Sep 2026 17:14:54 +0100
Subject: Establish native micro runtime checkpoint

---
 prototypes/connections/flow.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 prototypes/connections/flow.c

(limited to 'prototypes/connections/flow.c')

diff --git a/prototypes/connections/flow.c b/prototypes/connections/flow.c
new file mode 100644
index 0000000..1070c70
--- /dev/null
+++ b/prototypes/connections/flow.c
@@ -0,0 +1,41 @@
+#include "flow.h"
+#include <assert.h>
+
+void pure_transfer_abort(PureTransfer *t) {
+    if (!t->active) return;
+    PureRelease release = t->release;
+    void *owner = t->owner;
+    *t = (PureTransfer){0};
+    if (release) release(owner);
+}
+
+static void advance(PureTransfer *t) {
+    while (t->active && t->part < 2 && t->offset == t->spans[t->part].size) {
+        t->part++;
+        t->offset = 0;
+    }
+    if (t->active && t->part == 2) pure_transfer_abort(t);
+}
+
+void pure_transfer_init(PureTransfer *t, PureSpan header, PureSpan body,
+                        void *owner, PureRelease release) {
+    assert(!t->active);
+    assert((!header.size || header.data) && (!body.size || body.data));
+    *t = (PureTransfer){.spans = {header, body}, .owner = owner,
+                       .release = release, .active = true};
+    advance(t);
+}
+
+PureSpan pure_transfer_next(const PureTransfer *t, size_t limit) {
+    if (!t->active) return (PureSpan){0};
+    PureSpan span = t->spans[t->part];
+    size_t remaining = span.size - t->offset;
+    return (PureSpan){span.data + t->offset, remaining < limit ? remaining : limit};
+}
+
+bool pure_transfer_consume(PureTransfer *t, size_t bytes) {
+    if (!t->active || bytes > t->spans[t->part].size - t->offset) return false;
+    t->offset += bytes;
+    advance(t);
+    return true;
+}
-- 
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