summaryrefslogtreecommitdiff
path: root/backend/genesys/buffer.cpp
diff options
context:
space:
mode:
authorJörg Frings-Fürst <debian@jff-webhosting.net>2020-02-02 17:13:01 +0100
committerJörg Frings-Fürst <debian@jff-webhosting.net>2020-02-02 17:13:01 +0100
commitffa8801644a7d53cc1c785e3450f794c07a14eb0 (patch)
tree8d72a18a9a08b9151d12badcb1c78ce06a059f62 /backend/genesys/buffer.cpp
parent1687222e1b9e74c89cafbb5910e72d8ec7bfd40f (diff)
New upstream version 1.0.29upstream/1.0.29
Diffstat (limited to 'backend/genesys/buffer.cpp')
-rw-r--r--backend/genesys/buffer.cpp102
1 files changed, 102 insertions, 0 deletions
diff --git a/backend/genesys/buffer.cpp b/backend/genesys/buffer.cpp
new file mode 100644
index 0000000..f17e361
--- /dev/null
+++ b/backend/genesys/buffer.cpp
@@ -0,0 +1,102 @@
+/* sane - Scanner Access Now Easy.
+
+ Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+ This file is part of the SANE package.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA.
+
+ As a special exception, the authors of SANE give permission for
+ additional uses of the libraries contained in this release of SANE.
+
+ The exception is that, if you link a SANE library with other files
+ to produce an executable, this does not by itself cause the
+ resulting executable to be covered by the GNU General Public
+ License. Your use of that executable is in no way restricted on
+ account of linking the SANE library code into it.
+
+ This exception does not, however, invalidate any other reasons why
+ the executable file might be covered by the GNU General Public
+ License.
+
+ If you submit changes to SANE to the maintainers to be included in
+ a subsequent release, you agree by submitting the changes that
+ those changes may be distributed with this exception intact.
+
+ If you write modifications of your own for SANE, it is your choice
+ whether to permit this exception to apply to your modifications.
+ If you do not wish that, delete this exception notice.
+*/
+
+#include "buffer.h"
+#include <cstring>
+#include <stdexcept>
+
+namespace genesys {
+
+void Genesys_Buffer::alloc(std::size_t size)
+{
+ buffer_.resize(size);
+ avail_ = 0;
+ pos_ = 0;
+}
+
+void Genesys_Buffer::clear()
+{
+ buffer_.clear();
+ avail_ = 0;
+ pos_ = 0;
+}
+
+void Genesys_Buffer::reset()
+{
+ avail_ = 0;
+ pos_ = 0;
+}
+
+std::uint8_t* Genesys_Buffer::get_write_pos(std::size_t size)
+{
+ if (avail_ + size > buffer_.size())
+ return nullptr;
+ if (pos_ + avail_ + size > buffer_.size())
+ {
+ std::memmove(buffer_.data(), buffer_.data() + pos_, avail_);
+ pos_ = 0;
+ }
+ return buffer_.data() + pos_ + avail_;
+}
+
+std::uint8_t* Genesys_Buffer::get_read_pos()
+{
+ return buffer_.data() + pos_;
+}
+
+void Genesys_Buffer::produce(std::size_t size)
+{
+ if (size > buffer_.size() - avail_)
+ throw std::runtime_error("buffer size exceeded");
+ avail_ += size;
+}
+
+void Genesys_Buffer::consume(std::size_t size)
+{
+ if (size > avail_)
+ throw std::runtime_error("no more data in buffer");
+ avail_ -= size;
+ pos_ += size;
+}
+
+} // namespace genesys