1 files changed, 118 insertions, 0 deletions
diff --git a/lib/jpegstream.hh b/lib/jpegstream.hh
new file mode 100644
index 0000000..855341c
--- /dev/null
+++ b/lib/jpegstream.hh
@@ -0,0 +1,118 @@
+//  jpegstream.hh -- image streams producing JPEG files
+//  Copyright (C) 2008, 2009  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 then esmod.
+
+
+#ifndef iscan_jpegstream_hh_included
+#define iscan_jpegstream_hh_included
+
+#ifndef __cplusplus
+#error "This is a C++ header file; use a C++ compiler to compile it."
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "basic-imgstream.hh"
+
+#include <cstdio>
+#include <string>
+
+#if HAVE_JPEGLIB_H
+#include <jpeglib.h>
+#endif
+
+namespace iscan
+{
+  using std::string;
+
+  class jpegstream : public basic_imgstream
+  {
+  public:
+    typedef basic_imgstream::byte_type byte_type;
+    typedef basic_imgstream::size_type size_type;
+
+    explicit jpegstream (FILE *fp, const string& pathname = string ());
+    virtual ~jpegstream (void);
+
+    virtual basic_imgstream& write (const byte_type *line, size_type n);
+
+    static bool is_usable (void);
+
+  private:
+    basic_imgstream& write_header (void);
+    void check_consistency (void) const;
+
+    void init (void);
+
+    FILE *_stream;
+    bool  _header;
+
+    byte_type *_scanline;
+
+    static bool validate (lt_dlhandle h);
+    struct jpeg_lib_handle
+    {
+      bool        is_usable;
+      string      message;
+      lt_dlhandle lib;
+
+#if HAVE_JPEGLIB_H
+# ifndef jpeg_create_compress
+      fundecl (void, create_compress, jpeg_compress_struct *);
+# else
+      fundecl (void, CreateCompress, jpeg_compress_struct *, int, size_t);
+# endif
+      fundecl (void, finish_compress, jpeg_compress_struct *);
+      fundecl (void, destroy_compress, jpeg_compress_struct *);
+      fundecl (void, destroy, jpeg_common_struct *);
+
+      fundecl (void, stdio_dest, jpeg_compress_struct *, FILE *);
+      fundecl (struct jpeg_error_mgr *, std_error, jpeg_error_mgr *);
+
+      fundecl (void, write_scanlines, jpeg_compress_struct *, JSAMPLE **, int);
+      fundecl (void, set_defaults, jpeg_compress_struct *);
+      fundecl (void, start_compress, jpeg_compress_struct *, bool);
+
+      // only used for version detection purposes; available since libjpeg 7.0
+      fundecl (void, default_qtables, jpeg_compress_struct *, bool);
+#endif /* HAVE_JPEGLIB_H */
+    };
+    static jpeg_lib_handle *lib;
+
+#if HAVE_JPEGLIB_H
+    static void error_exit (j_common_ptr info);
+
+    struct jpeg_compress_struct _info;
+    struct jpeg_error_mgr       _err;
+#endif
+  };
+
+} // namespace iscan
+
+#endif  /* !defined (iscan_jpegstream_hh_included) */