New upstream version 1.0.29upstream/1.0.29

1 files changed, 203 insertions, 0 deletions

diff --git a/backend/genesys/image_buffer.cpp b/backend/genesys/image_buffer.cpp
new file mode 100644
index 0000000..07c6987
--- /dev/null
+++ b/backend/genesys/image_buffer.cpp
@@ -0,0 +1,203 @@
+/* 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.
+*/
+
+#define DEBUG_DECLARE_ONLY
+
+#include "image_buffer.h"
+#include "image.h"
+
+namespace genesys {
+
+ImageBuffer::ImageBuffer(std::size_t size, ProducerCallback producer) :
+    producer_{producer},
+    size_{size},
+    buffer_offset_{size}
+{
+    buffer_.resize(size_);
+}
+
+bool ImageBuffer::get_data(std::size_t size, std::uint8_t* out_data)
+{
+    const std::uint8_t* out_data_end = out_data + size;
+
+    auto copy_buffer = [&]()
+    {
+        std::size_t bytes_copy = std::min<std::size_t>(out_data_end - out_data, available());
+        std::memcpy(out_data, buffer_.data() + buffer_offset_, bytes_copy);
+        out_data += bytes_copy;
+        buffer_offset_ += bytes_copy;
+    };
+
+    // first, read remaining data from buffer
+    if (available() > 0) {
+        copy_buffer();
+    }
+
+    if (out_data == out_data_end) {
+        return true;
+    }
+
+    // now the buffer is empty and there's more data to be read
+    bool got_data = true;
+    do {
+        buffer_offset_ = 0;
+        got_data &= producer_(size_, buffer_.data());
+
+        copy_buffer();
+    } while(out_data < out_data_end && got_data);
+
+    return got_data;
+}
+
+void FakeBufferModel::push_step(std::size_t buffer_size, std::size_t row_bytes)
+{
+    sizes_.push_back(buffer_size);
+    available_sizes_.push_back(0);
+    row_bytes_.push_back(row_bytes);
+}
+
+std::size_t FakeBufferModel::available_space() const
+{
+    if (sizes_.empty())
+        throw SaneException("Model has not been setup");
+    return sizes_.front() - available_sizes_.front();
+}
+
+void FakeBufferModel::simulate_read(std::size_t size)
+{
+    if (sizes_.empty()) {
+        throw SaneException("Model has not been setup");
+    }
+    if (available_space() < size) {
+        throw SaneException("Attempted to simulate read of too much memory");
+    }
+
+    available_sizes_.front() += size;
+
+    for (unsigned i = 1; i < sizes_.size(); ++i) {
+        auto avail_src = available_sizes_[i - 1];
+        auto avail_dst = sizes_[i] - available_sizes_[i];
+
+        auto avail = (std::min(avail_src, avail_dst) / row_bytes_[i]) * row_bytes_[i];
+        available_sizes_[i - 1] -= avail;
+        available_sizes_[i] += avail;
+    }
+    available_sizes_.back() = 0;
+}
+
+ImageBufferGenesysUsb::ImageBufferGenesysUsb(std::size_t total_size,
+                                             const FakeBufferModel& buffer_model,
+                                             ProducerCallback producer) :
+    remaining_size_{total_size},
+    buffer_model_{buffer_model},
+    producer_{producer}
+{}
+
+bool ImageBufferGenesysUsb::get_data(std::size_t size, std::uint8_t* out_data)
+{
+    const std::uint8_t* out_data_end = out_data + size;
+
+    auto copy_buffer = [&]()
+    {
+        std::size_t bytes_copy = std::min<std::size_t>(out_data_end - out_data, available());
+        std::memcpy(out_data, buffer_.data() + buffer_offset_, bytes_copy);
+        out_data += bytes_copy;
+        buffer_offset_ += bytes_copy;
+    };
+
+    // first, read remaining data from buffer
+    if (available() > 0) {
+        copy_buffer();
+    }
+
+    if (out_data == out_data_end) {
+        return true;
+    }
+
+    // now the buffer is empty and there's more data to be read
+    do {
+        if (remaining_size_ == 0)
+            return false;
+
+        auto bytes_to_read = get_read_size();
+        buffer_offset_ = 0;
+        buffer_end_ = bytes_to_read;
+        buffer_.resize(bytes_to_read);
+
+        producer_(bytes_to_read, buffer_.data());
+
+        if (remaining_size_ < bytes_to_read) {
+            remaining_size_ = 0;
+        } else {
+            remaining_size_ -= bytes_to_read;
+        }
+
+        copy_buffer();
+    } while(out_data < out_data_end);
+    return true;
+}
+
+std::size_t ImageBufferGenesysUsb::get_read_size()
+{
+    std::size_t size = buffer_model_.available_space();
+
+    // never read an odd number. exception: last read
+    // the chip internal counter does not count half words.
+    size &= ~1;
+
+    // Some setups need the reads to be multiples of 256 bytes
+    size &= ~0xff;
+
+    if (remaining_size_ < size) {
+        size = remaining_size_;
+        /*round up to a multiple of 256 bytes */
+        size += (size & 0xff) ? 0x100 : 0x00;
+        size &= ~0xff;
+    }
+
+    buffer_model_.simulate_read(size);
+
+    return size;
+}
+
+} // namespace genesys