New upstream version 1.0.28upstream/1.0.28

1 files changed, 229 insertions, 0 deletions

diff --git a/backend/ricoh2_buffer.c b/backend/ricoh2_buffer.c
new file mode 100644
index 0000000..b8d7d90
--- /dev/null
+++ b/backend/ricoh2_buffer.c
@@ -0,0 +1,229 @@
+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2018 Stanislav Yuzvinsky
+   Based on the work done by viruxx
+
+   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 "../include/sane/config.h"
+
+#include <memory.h>
+#include <assert.h>
+#include <malloc.h>
+
+#include "../include/sane/sanei_debug.h"
+
+typedef struct ricoh2_buffer
+{
+  /* lifetime constants */
+  SANE_Byte *data;
+  SANE_Int   size;
+  SANE_Int   pixels_per_line;
+  SANE_Int   info_size;
+  SANE_Bool  is_rgb;
+
+  /* state */
+  SANE_Int   current_position;
+  SANE_Int   remain_in_line;
+
+}
+ricoh2_buffer;
+
+static ricoh2_buffer *
+ricoh2_buffer_create (SANE_Int  size,
+                      SANE_Int  pixels_per_line,
+                      SANE_Int  info_size,
+                      SANE_Bool is_rgb)
+{
+  ricoh2_buffer *self;
+  assert (size > 0);
+  assert (pixels_per_line > 0);
+  assert (info_size >= 0);
+
+  self = malloc (sizeof (ricoh2_buffer));
+  if (!self)
+    return NULL;
+
+  self->data = malloc (size);
+  if (!self->data)
+    {
+      free (self);
+      return NULL;
+    }
+
+  self->size = size;
+  self->pixels_per_line = pixels_per_line;
+  self->info_size = info_size;
+  self->is_rgb = is_rgb;
+
+  self->current_position = 0;
+  self->remain_in_line = pixels_per_line;
+
+
+  DBG (192,
+       "size = %d pixels_per_line = %d info_size = %d rgb? = %d pos = %d\n",
+       self->size,
+       self->pixels_per_line,
+       self->info_size,
+       self->is_rgb,
+       self->current_position);
+
+  return self;
+}
+
+/* destructor */
+static void
+ricoh2_buffer_dispose (ricoh2_buffer *self)
+{
+  assert (self);
+  free (self->data);
+  free (self);
+}
+
+static SANE_Byte *
+ricoh2_buffer_get_internal_buffer (ricoh2_buffer *self)
+{
+  assert (self);
+  DBG (192, "engaging a buffer of size %d\n", self->size);
+
+  self->current_position = 0;
+  self->remain_in_line = self->pixels_per_line;
+
+  DBG (192, "remain in line = %d\n", self->remain_in_line);
+
+  return self->data;
+}
+
+static SANE_Int
+ricoh2_buffer_get_bytes_remain (ricoh2_buffer *self)
+{
+  assert (self);
+
+  DBG (192,
+       "bytes remain in the buffer %d\n",
+       self->size - self->current_position);
+
+  return self->size - self->current_position;
+}
+
+inline static SANE_Int
+min (SANE_Int v1, SANE_Int v2)
+{
+  return v1 < v2 ? v1 : v2;
+}
+
+static SANE_Int
+ricoh2_buffer_get_data (ricoh2_buffer *self,
+                        SANE_Byte     *dest,
+                        SANE_Int       dest_size)
+{
+  SANE_Int actually_copied = 0;
+  SANE_Int pixels_to_copy;
+  SANE_Int bytes_per_pixel;
+  SANE_Int bytes_per_color;
+  SANE_Byte *src;
+  SANE_Byte *end;
+
+  assert (self);
+  assert (dest);
+  assert (self->size > self->current_position);
+
+  bytes_per_pixel = self->is_rgb ? 3 : 1;
+  bytes_per_color = self->pixels_per_line + self->info_size;
+
+  DBG (192,
+       "trying to get %d bytes from the buffer, "
+       "while %d bytes in the line\n",
+       dest_size,
+       self->remain_in_line);
+
+  for (pixels_to_copy =
+       min (dest_size / bytes_per_pixel, self->remain_in_line);
+       pixels_to_copy && self->size > self->current_position;
+       pixels_to_copy =
+       min (dest_size / bytes_per_pixel, self->remain_in_line))
+    {
+
+      DBG (192,
+           "providing %d bytes to the user (until the end of the line), "
+           "position in buffer is %d\n",
+           pixels_to_copy * bytes_per_pixel,
+           self->current_position);
+
+      for (src = self->data + self->current_position,
+           end = src + pixels_to_copy;
+           src < end;
+           ++src)
+        {
+          *(dest++) = *(src);
+          if (bytes_per_pixel == 3)
+            {
+              *(dest++) = *(src + bytes_per_color);
+              *(dest++) = *(src + 2 * bytes_per_color);
+            }
+        }
+
+      dest_size -= pixels_to_copy * bytes_per_pixel;
+      actually_copied += pixels_to_copy * bytes_per_pixel;
+      self->current_position += pixels_to_copy;
+      self->remain_in_line -= pixels_to_copy;
+
+      // move to the next line
+      if (!self->remain_in_line)
+        {
+          self->current_position += self->info_size;
+          if (self->is_rgb)
+            self->current_position += 2 * bytes_per_color;
+          self->remain_in_line = self->pixels_per_line;
+          DBG (192,
+               "Line feed, new position is %d\n",
+               self->current_position);
+        }
+
+      DBG (192,
+           "left in the buffer: %d\n",
+           self->size - self->current_position);
+    }
+
+  /* invariant */
+  assert (self->size >= self->current_position);
+
+  return actually_copied;
+}