1 files changed, 90 insertions, 0 deletions
diff --git a/lib/nghttp3_buf.c b/lib/nghttp3_buf.c
new file mode 100644
index 0000000..aae075a
--- /dev/null
+++ b/lib/nghttp3_buf.c
@@ -0,0 +1,90 @@
+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ * Copyright (c) 2017 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 "nghttp3_buf.h"
+
+void nghttp3_buf_init(nghttp3_buf *buf) {
+  buf->begin = buf->end = buf->pos = buf->last = NULL;
+}
+
+void nghttp3_buf_wrap_init(nghttp3_buf *buf, uint8_t *src, size_t len) {
+  buf->begin = buf->pos = buf->last = src;
+  buf->end = buf->begin + len;
+}
+
+void nghttp3_buf_free(nghttp3_buf *buf, const nghttp3_mem *mem) {
+  nghttp3_mem_free(mem, buf->begin);
+}
+
+size_t nghttp3_buf_left(const nghttp3_buf *buf) {
+  return (size_t)(buf->end - buf->last);
+}
+
+size_t nghttp3_buf_len(const nghttp3_buf *buf) {
+  return (size_t)(buf->last - buf->pos);
+}
+
+size_t nghttp3_buf_cap(const nghttp3_buf *buf) {
+  return (size_t)(buf->end - buf->begin);
+}
+
+void nghttp3_buf_reset(nghttp3_buf *buf) { buf->pos = buf->last = buf->begin; }
+
+int nghttp3_buf_reserve(nghttp3_buf *buf, size_t size, const nghttp3_mem *mem) {
+  uint8_t *p;
+  nghttp3_ssize pos_offset, last_offset;
+
+  if ((size_t)(buf->end - buf->begin) >= size) {
+    return 0;
+  }
+
+  pos_offset = buf->pos - buf->begin;
+  last_offset = buf->last - buf->begin;
+
+  p = nghttp3_mem_realloc(mem, buf->begin, size);
+  if (p == NULL) {
+    return NGHTTP3_ERR_NOMEM;
+  }
+
+  buf->begin = p;
+  buf->end = p + size;
+  buf->pos = p + pos_offset;
+  buf->last = p + last_offset;
+
+  return 0;
+}
+
+void nghttp3_buf_swap(nghttp3_buf *a, nghttp3_buf *b) {
+  nghttp3_buf c = *a;
+
+  *a = *b;
+  *b = c;
+}
+
+void nghttp3_typed_buf_init(nghttp3_typed_buf *tbuf, const nghttp3_buf *buf,
+                            nghttp3_buf_type type) {
+  tbuf->buf = *buf;
+  tbuf->type = type;
+}