kopia lustrzana https://gitlab.com/sane-project/backends
103 wiersze
2.9 KiB
C++
103 wiersze
2.9 KiB
C++
/* sane - Scanner Access Now Easy.
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Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
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This file is part of the SANE package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE library with other files
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to produce an executable, this does not by itself cause the
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resulting executable to be covered by the GNU General Public
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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This exception does not, however, invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, it is your choice
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whether to permit this exception to apply to your modifications.
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If you do not wish that, delete this exception notice.
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*/
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#include "buffer.h"
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#include <cstring>
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#include <stdexcept>
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namespace genesys {
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void Genesys_Buffer::alloc(std::size_t size)
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{
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buffer_.resize(size);
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avail_ = 0;
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pos_ = 0;
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}
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void Genesys_Buffer::clear()
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{
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buffer_.clear();
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avail_ = 0;
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pos_ = 0;
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}
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void Genesys_Buffer::reset()
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{
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avail_ = 0;
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pos_ = 0;
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}
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std::uint8_t* Genesys_Buffer::get_write_pos(std::size_t size)
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{
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if (avail_ + size > buffer_.size())
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return nullptr;
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if (pos_ + avail_ + size > buffer_.size())
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{
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std::memmove(buffer_.data(), buffer_.data() + pos_, avail_);
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pos_ = 0;
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}
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return buffer_.data() + pos_ + avail_;
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}
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std::uint8_t* Genesys_Buffer::get_read_pos()
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{
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return buffer_.data() + pos_;
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}
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void Genesys_Buffer::produce(std::size_t size)
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{
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if (size > buffer_.size() - avail_)
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throw std::runtime_error("buffer size exceeded");
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avail_ += size;
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}
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void Genesys_Buffer::consume(std::size_t size)
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{
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if (size > avail_)
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throw std::runtime_error("no more data in buffer");
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avail_ -= size;
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pos_ += size;
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}
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} // namespace genesys
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