Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/buffer/bufread.hpp

@@ -0,0 +1,67 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program 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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_BUFFER_BUFREAD_H
+#define OPENVPN_BUFFER_BUFREAD_H
+
+#include <unistd.h>
+#include <errno.h>
+
+#include <string>
+#include <cstring>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/common/strerror.hpp>
+#include <openvpn/buffer/buflist.hpp>
+
+namespace openvpn {
+  OPENVPN_EXCEPTION(buf_read_error);
+
+  inline bool buf_read(const int fd, Buffer& buf, const std::string& title)
+  {
+    const ssize_t status = ::read(fd, buf.data_end(), buf.remaining(0));
+    if (status < 0)
+      {
+	const int eno = errno;
+	OPENVPN_THROW(buf_read_error, "on " << title << " : " << strerror_str(eno));
+      }
+    else if (!status)
+      return false;
+    buf.inc_size(status);
+    return true;
+  }
+
+  inline BufferList buf_read(const int fd, const std::string& title)
+  {
+    BufferList buflist;
+    while (true)
+      {
+	BufferAllocated buf(1024, 0);
+	if (!buf_read(fd, buf, title))
+	  break;
+	buflist.put_consume(buf);
+      }
+    return buflist;
+  }
+}
+
+#endif