Add generic buffer code

Represents a block of memory that can be added to, parsed and so on

1 files changed, 82 insertions, 0 deletions

diff --git a/common/buffer.h b/common/buffer.h
new file mode 100644
index 0000000..d5335f8
--- /dev/null
+++ b/common/buffer.h
@@ -0,0 +1,82 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+/* buffer.h - Generic data buffer, used by openssh, gnome-keyring
+
+   Copyright (C) 2007, 2012 Stefan Walter
+   Copyright (C) 2012 Red Hat Inc.
+
+   The Gnome Keyring Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The Gnome Keyring Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the Gnome Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+
+   Author: Stef Walter <stef@thewalter.net>
+*/
+
+#ifndef P11_BUFFER_H_
+#define P11_BUFFER_H_
+
+#include "compat.h"
+
+enum {
+	P11_BUFFER_FAILED = 1 << 0,
+	P11_BUFFER_NULL = 1 << 1,
+};
+
+typedef struct {
+	void *data;
+	size_t len;
+
+	int flags;
+	size_t size;
+	void * (* frealloc) (void *, size_t);
+	void (* ffree) (void *);
+} p11_buffer;
+
+bool             p11_buffer_init             (p11_buffer *buffer,
+                                              size_t size);
+
+bool             p11_buffer_init_null        (p11_buffer *buffer,
+                                              size_t size);
+
+void             p11_buffer_init_full        (p11_buffer *buffer,
+                                              void *data,
+                                              size_t len,
+                                              int flags,
+                                              void * (* frealloc) (void *, size_t),
+                                              void (* ffree) (void *));
+
+void             p11_buffer_uninit           (p11_buffer *buffer);
+
+void *           p11_buffer_steal            (p11_buffer *buffer,
+                                              size_t *length);
+
+bool             p11_buffer_reset            (p11_buffer *buffer,
+                                              size_t size);
+
+void *           p11_buffer_append           (p11_buffer *buffer,
+                                              size_t length);
+
+void             p11_buffer_add              (p11_buffer *buffer,
+                                              const void *data,
+                                              ssize_t length);
+
+#define          p11_buffer_fail(buf) \
+	((buf)->flags |= P11_BUFFER_FAILED)
+
+#define          p11_buffer_ok(buf) \
+	(((buf)->flags & P11_BUFFER_FAILED) ? false : true)
+
+#define          p11_buffer_failed(buf) \
+	(((buf)->flags & P11_BUFFER_FAILED) ? true : false)
+
+#endif /* BUFFER_H */