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-rw-r--r--lib/ngtcp2_balloc.c90
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;
+}