start adding code to handle the filesystem data file

author: Rob Savoye <rob@welcomehome.org> 2010-11-26 10:30:40 -0700
committer: Rob Savoye <rob@welcomehome.org> 2010-11-26 10:30:40 -0700
commit: e8a3f5bacd2d7b662e43be4bee0189d91465281b (patch)
tree: 80563ae25859be78a7f953759e7c09486ac89ae6 /gr-run-waveform
parent: 06f49339578b048b6a2f9d892ba61081e96a4186 (diff)
3 files changed, 200 insertions, 0 deletions
diff --git a/gr-run-waveform/test_xyzzy.cc b/gr-run-waveform/test_xyzzy.cc
new file mode 100644
index 0000000000..b629e20f6c
--- /dev/null
+++ b/gr-run-waveform/test_xyzzy.cc
@@ -0,0 +1,50 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <libguile.h>
+
+// Include our definitions
+#include "xyzzy.h"
+
+using namespace std;
+
+int
+main(int argc, char *argv[])
+{
+
+// Initialize with the data file produced by gen-xyzzy.
+// bool init()
+// bool init(const std::string &file)
+// Does a file with name 'filename' exist in magic filesystem?
+//    bool file_exists(handle, const std::string &filespec);
+// bool file_exists(const std::string &filespec)
+
+// Return a C port that will read the file contents
+//    SCM make_read_only_port(handle, const std::string &filespec)
+// SCM make_read_only_port(const std::string &filespec)
+    
+}
diff --git a/gr-run-waveform/xyzzy.cc b/gr-run-waveform/xyzzy.cc
new file mode 100644
index 0000000000..a54947c510
--- /dev/null
+++ b/gr-run-waveform/xyzzy.cc
@@ -0,0 +1,68 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <libguile.h>
+
+// Include our definitions
+#include "xyzzy.h"
+
+using namespace std;
+
+typedef void* handle_t;
+
+handle_t datafile;
+
+
+// Initialize with the data file produced by gen-xyzzy.
+bool init()
+{
+    string filespec = PKGLIBDIR;
+    filespec += '/';
+    filespec += "filesystem.dat";
+    return init(filespec);
+};
+
+bool init(const std::string &file)
+{
+    return false;
+};
+
+// Does a file with name 'filename' exist in magic filesystem?
+//    bool file_exists(handle, const std::string &filespec);
+bool
+file_exists(const std::string &filespec)
+{
+//    datafile
+}
+
+// Return a C port that will read the file contents
+//    SCM make_read_only_port(handle, const std::string &filespec)
+SCM
+make_read_only_port(const std::string &filespec)
+{
+//    datafile
+}
diff --git a/gr-run-waveform/xyzzy.h b/gr-run-waveform/xyzzy.h
new file mode 100644
index 0000000000..024c9f963f
--- /dev/null
+++ b/gr-run-waveform/xyzzy.h
@@ -0,0 +1,82 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _XYZZY_H_
+#define _XYZZY_H_ 1
+
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include <libguile.h>
+
+using namespace std;
+
+// - Special case filenames that start with /-xyzzy-/... and search for
+//   and load them using the single file.  We'd stick "/-zyzzy-" first
+//   in the default load-path.
+
+// - Create a C read-only "port" that "reads" from the string in the file.
+//   (See guile docs on creating new kinds of ports)
+
+// - Override the default implementation of "primitive-load" and "%search-load-path"
+//   to make that happen.  See load.c in the guile source code.  Figure
+//   out how to get the override done before guile is fully
+//   initialized.  (Guile loads ice-9/boot9.scm to start itself up.  We'd
+//   need to redirect before then.)
+
+struct header {
+    char     magic[8];
+    
+    uint32_t offset_to_directory;	// byte offset from start of file
+    uint32_t size_of_directory;         // bytes
+    uint32_t number_of_dir_entries;
+    
+    uint32_t offset_to_strings;	// byte offset from start of file
+    uint32_t size_of_strings;	// bytes
+};
+
+struct directory_entry {
+    uint32_t offset_to_name;	 // from start of strings
+    uint32_t offset_to_contents; // from start of strings
+};
+    
+// Each string starts with a uint32_t length, followed by length bytes.
+// There is no trailing \0 in the string.    
+struct string_entry {
+    uint32_t	    length;
+    unsigned char c[1];		// 0 is nicer, but not portable.
+};
+
+// Initialize with the data file produced by gen-xyzzy.
+bool init(const std::string &filespec);
+bool init();
+
+// Does a file with name 'filename' exist in magic filesystem?
+bool file_exists(const std::string &filespec);
+
+// Return a C port that will read the file contents
+SCM make_read_only_port(const std::string &filespec);
+
+#endif  // _XYZZY_H_ 1
author	Rob Savoye <rob@welcomehome.org>	2010-11-26 10:30:40 -0700
committer	Rob Savoye <rob@welcomehome.org>	2010-11-26 10:30:40 -0700
commit	e8a3f5bacd2d7b662e43be4bee0189d91465281b (patch)
tree	80563ae25859be78a7f953759e7c09486ac89ae6 /gr-run-waveform
parent	06f49339578b048b6a2f9d892ba61081e96a4186 (diff)