*** empty log message ***

diff --git a/v7/src/edwin/unix.scm b/v7/src/edwin/unix.scm
index 434202ca008d700bd7e35180a191a6b67fc2f1e3..0fb9c20ac881ef07c622cc641a5bf301b3560a76 100644 (file)
--- a/v7/src/edwin/unix.scm
+++ b/v7/src/edwin/unix.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/unix.scm,v 1.22 1992/02/08 15:23:43 cph Exp $
+;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/unix.scm,v 1.23 1992/04/06 20:25:27 bal Exp $
 ;;;
 ;;;    Copyright (c) 1989-92 Massachusetts Institute of Technology
 ;;;
@@ -334,6 +334,14 @@ Includes the new backup.  Must be > 0."
        (and (file-exists? pathname)
             pathname))))
 \f
+(define (os/read-file-methods)
+  (list maybe-read-compressed-file
+       maybe-read-encrypted-file))
+
+(define (os/write-file-methods)
+  (list maybe-write-compressed-file
+       maybe-write-encrypted-file))
+
 ;;;; Compressed Files
 
 (define-variable enable-compressed-files
@@ -343,9 +351,6 @@ filename suffix \".Z\"."
   true
   boolean?)
 
-(define (os/read-file-methods)
-  (list maybe-read-compressed-file))
-
 (define (maybe-read-compressed-file pathname mark visit?)
   visit?
   (and (ref-variable enable-compressed-files mark)
@@ -369,9 +374,6 @@ filename suffix \".Z\"."
                            read-compressed-file
                            (list pathname mark))))
 
-(define (os/write-file-methods)
-  (list maybe-write-compressed-file))
-
 (define (maybe-write-compressed-file region pathname visit?)
   visit?
   (and (ref-variable enable-compressed-files (region-start region))
@@ -393,4 +395,64 @@ filename suffix \".Z\"."
                            "file"
                            "[unknown]"
                            write-compressed-file
-                           (list region pathname))))
\ No newline at end of file
+                           (list region pathname))))
+\f
+;;;; Encrypted files
+
+(load-option 'krypt)
+
+(define-variable enable-encrypted-files
+  "If true, encrypted files are automatically decrypted when read,
+and recrypted when written.  An encrypted file is identified by the
+filename suffix \".KY\"."
+  true
+  boolean?)
+
+(define (maybe-read-encrypted-file pathname mark visit?)
+  visit?
+  (and (ref-variable enable-encrypted-files mark)
+       (equal? "KY" (pathname-type pathname))
+       (begin
+        (read-encrypted-file pathname mark)
+        true)))
+
+(define (read-encrypted-file pathname mark)
+  (let ((the-encrypted-file
+        (with-input-from-file pathname
+          (lambda ()
+            (read-string (char-set)))))
+       (password 
+        (prompt-for-password "Password: ")))
+    (insert-string
+     (decrypt the-encrypted-file password
+             (lambda () 
+               (kill-buffer (mark-buffer mark))
+               (editor-beep)
+               (message "krypt: Password error!")
+               (abort-current-command))
+             (lambda (x) 
+               (editor-beep)
+               (message "krypt: Checksum error!")
+               x))
+     mark)))
+
+(define (maybe-write-encrypted-file region pathname visit?)
+  visit?
+  (and (ref-variable enable-compressed-files (region-start region))
+       (equal? "KY" (pathname-type pathname))
+       (begin
+        (write-encrypted-file region pathname)
+        true)))
+
+(define (write-encrypted-file region pathname)
+  (let* ((password 
+         (prompt-for-confirmed-password))
+        (the-encrypted-file
+         (encrypt (extract-string (region-start region) (region-end region))
+                  password)))
+    (with-output-to-file pathname
+      (lambda ()
+       (write-string the-encrypted-file)))))
+
+;;; End of encrypted files
+