1 files changed, 142 insertions, 0 deletions
diff --git a/lib/imgstream.cc b/lib/imgstream.cc
new file mode 100644
index 0000000..80f87fb
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+++ b/lib/imgstream.cc
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+//  imgstream.cc -- provides an interface to write multiple images
+//  Copyright (C) 2008  SEIKO EPSON CORPORATION
+//
+//  This file is part of the 'iscan' program.
+//
+//  The 'iscan' program is free-ish 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 FITNESS
+//  FOR A PARTICULAR PURPOSE or MERCHANTABILITY.
+//  See the GNU General Public License for more details.
+//
+//  You should have received a verbatim copy of the GNU General Public
+//  License along with this program; if not, write to:
+//
+//      Free Software Foundation, Inc.
+//      59 Temple Place, Suite 330
+//      Boston, MA  02111-1307  USA
+//
+//  As a special exception, the copyright holders give permission
+//  to link the code of this program with the esmod library and
+//  distribute linked combinations including the two.  You must obey
+//  the GNU General Public License in all respects for all of the
+//  code used other than esmod.
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "imgstream.hh"
+
+#include "jpegstream.hh"
+#include "pcxstream.hh"
+#include "pngstream.hh"
+#include "pnmstream.hh"
+#include "pdfstream.hh"
+#include "tiffstream.hh"
+
+namespace iscan
+{
+  imgstream::imgstream (file_opener& opener, file_format format,
+                        bool match_direction)
+    : _page (0), _match_direction (match_direction),
+      _opener (&opener), _format (format), _configured (false)
+  {
+    _stream = create_stream ();
+  }
+
+  imgstream::imgstream (void)
+    : _page (0), _match_direction (false), _opener (NULL), _format (NO_FORMAT),
+      _stream (NULL), _configured (false)
+  {
+  }
+
+  imgstream::~imgstream (void)
+  {
+    delete _stream;
+  }
+
+  imgstream&
+  imgstream::write (const byte_type *data, size_type n)
+  {
+    if (!_stream) return *this;
+
+    if (!_configured)
+      {
+        _stream->size (_h_sz, _v_sz);
+        _stream->resolution (_hres, _vres);
+        _stream->colour (_cspc);
+        _stream->depth (_bits);
+        _configured = true;
+      }
+
+    _stream->write (data, n);
+
+    return *this;
+  }
+
+  imgstream&
+  imgstream::flush (void)
+  {
+    if (_stream) _stream->flush ();
+    return *this;
+  }
+
+  void
+  imgstream::next (void)
+  {
+    if (!_configured) return;
+
+    delete _stream;
+    _configured = false;
+
+    ++_page;
+    ++(*_opener);
+    _stream = create_stream ();
+    if (_match_direction) _stream->rotate_180 (is_back (_page));
+  }
+
+  bool
+  imgstream::is_back (unsigned long page)
+  {
+    return 0 == (page+1)%2;
+  }
+
+  bool
+  imgstream::is_usable (void)
+  {
+    return true;
+  }
+
+  basic_imgstream *
+  imgstream::create_stream (void)
+  {
+    if (PCX == _format) return new pcxstream (*_opener);
+    if (PNM == _format) return new pnmstream (*_opener);
+    if (PNG == _format) return new pngstream (*_opener);
+    if (JPG == _format) return new jpegstream (*_opener);
+    if (PDF == _format) return new pdfstream (*_opener);
+    if (TIF == _format) return new tiffstream (*_opener, _opener->temp ());
+
+    throw std::invalid_argument ("unsupported file format");
+  }
+
+  imgstream *
+  create_imgstream (file_opener& opener, file_format format,
+                    bool match_direction)
+  {
+    if (opener.is_collating ())
+      {
+        if (PDF == format) return new pdfstream (opener, match_direction);
+        if (TIF == format) return new tiffstream (opener, opener.name ());
+      }
+    
+    return new imgstream (opener, format, match_direction);
+  }
+
+}       // namespace iscan