1 files changed, 62 insertions, 0 deletions
diff --git a/include/haproxy/buf-t.h b/include/haproxy/buf-t.h
new file mode 100644
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+++ b/include/haproxy/buf-t.h
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+/*
+ * include/haproxy/buf-t.h
+ * Simple buffer handling - types definitions.
+ *
+ * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
+ *
+ * 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.
+ */
+
+#ifndef _HAPROXY_BUF_T_H
+#define _HAPROXY_BUF_T_H
+
+#include <haproxy/api-t.h>
+
+/* Structure defining a buffer's head */
+struct buffer {
+	size_t size;                /* buffer size in bytes */
+	char  *area;                /* points to <size> bytes */
+	size_t data;                /* amount of data after head including wrapping */
+	size_t head;                /* start offset of remaining data relative to area */
+};
+
+/* A buffer may be in 3 different states :
+ *   - unallocated : size == 0, area == 0  (b_is_null() is true)
+ *   - waiting     : size == 0, area != 0  (b_is_null() is true)
+ *   - allocated   : size  > 0, area  > 0  (b_is_null() is false)
+ */
+
+/* initializers for certain buffer states. It is important that the NULL buffer
+ * remains the one with all fields initialized to zero so that a calloc() or a
+ * memset() on a struct automatically sets a NULL buffer.
+ */
+#define BUF_NULL   ((struct buffer){ })
+#define BUF_WANTED ((struct buffer){ .area = (char *)1 })
+#define BUF_RING   ((struct buffer){ .area = (char *)2 })
+
+#endif /* _HAPROXY_BUF_T_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */