1 files changed, 90 insertions, 0 deletions
diff --git a/lib/ngtcp2_balloc.c b/lib/ngtcp2_balloc.c
new file mode 100644
index 0000000..5cc39ee
--- /dev/null
+++ b/lib/ngtcp2_balloc.c
@@ -0,0 +1,90 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2022 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "ngtcp2_balloc.h"
+
+#include <assert.h>
+
+#include "ngtcp2_mem.h"
+
+void ngtcp2_balloc_init(ngtcp2_balloc *balloc, size_t blklen,
+                        const ngtcp2_mem *mem) {
+  assert((blklen & 0xfu) == 0);
+
+  balloc->mem = mem;
+  balloc->blklen = blklen;
+  balloc->head = NULL;
+  ngtcp2_buf_init(&balloc->buf, (void *)"", 0);
+}
+
+void ngtcp2_balloc_free(ngtcp2_balloc *balloc) {
+  if (balloc == NULL) {
+    return;
+  }
+
+  ngtcp2_balloc_clear(balloc);
+}
+
+void ngtcp2_balloc_clear(ngtcp2_balloc *balloc) {
+  ngtcp2_memblock_hd *p, *next;
+
+  for (p = balloc->head; p; p = next) {
+    next = p->next;
+    ngtcp2_mem_free(balloc->mem, p);
+  }
+
+  balloc->head = NULL;
+  ngtcp2_buf_init(&balloc->buf, (void *)"", 0);
+}
+
+int ngtcp2_balloc_get(ngtcp2_balloc *balloc, void **pbuf, size_t n) {
+  uint8_t *p;
+  ngtcp2_memblock_hd *hd;
+
+  assert(n <= balloc->blklen);
+
+  if (ngtcp2_buf_left(&balloc->buf) < n) {
+    p = ngtcp2_mem_malloc(balloc->mem,
+                          sizeof(ngtcp2_memblock_hd) + 0x10u + balloc->blklen);
+    if (p == NULL) {
+      return NGTCP2_ERR_NOMEM;
+    }
+
+    hd = (ngtcp2_memblock_hd *)(void *)p;
+    hd->next = balloc->head;
+    balloc->head = hd;
+    ngtcp2_buf_init(
+        &balloc->buf,
+        (uint8_t *)(((uintptr_t)p + sizeof(ngtcp2_memblock_hd) + 0xfu) &
+                    ~(uintptr_t)0xfu),
+        balloc->blklen);
+  }
+
+  assert(((uintptr_t)balloc->buf.last & 0xfu) == 0);
+
+  *pbuf = balloc->buf.last;
+  balloc->buf.last += (n + 0xfu) & ~(uintptr_t)0xfu;
+
+  return 0;
+}