(jka-compr-partial-uncompress): Make dd give you

one more block than you think you need.

(jka-compr-dd-blocksize): Change default value to 256.

diff --git a/lisp/jka-compr.el b/lisp/jka-compr.el
index 2a0eb5a2e2db5da6ddf8fb3175e6621df20c496d..1519e056c21cbb69372723342a0c621bc62af83f 100644 (file)
--- a/lisp/jka-compr.el
+++ b/lisp/jka-compr.el
@@ -2,7 +2,7 @@
 ;;; Copyright (C) 1993, 1994  Free Software Foundation, Inc.
 
 ;; Author: jka@ece.cmu.edu (Jay K. Adams)
-;; Version: 0.10
+;; Version: 0.11
 ;; Keywords: data
 
 ;;; Commentary: 
@@ -12,7 +12,7 @@
 ;;; I/O functions (including write-region and insert-file-contents) so
 ;;; that they automatically compress or uncompress a file if the file
 ;;; appears to need it (based on the extension of the file name).
-;;; Packages like Rmail, Vm, Gnus, and Info should be able to work
+;;; Packages like Rmail, VM, GNUS, and Info should be able to work
 ;;; with compressed files without modification.
 
 
@@ -225,7 +225,7 @@ based on the filename itself and jka-compr-compression-info-list."
   "/bin/dd")
 
 
-(defvar jka-compr-dd-blocksize 512)
+(defvar jka-compr-dd-blocksize 256)
 
 
 (defun jka-compr-partial-uncompress (prog message args infile beg len)
@@ -238,7 +238,6 @@ the BEGth char."
         (prefix (- beg (* skip jka-compr-dd-blocksize)))
         (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
         (start (point))
-        (end (and count (+ start (* count jka-compr-dd-blocksize))))
         (err-file (jka-compr-make-temp-name))
         (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null"
                             prog
@@ -247,7 +246,10 @@ the BEGth char."
                             jka-compr-dd-program
                             jka-compr-dd-blocksize
                             skip
-                            (if count (concat "count=" count) ""))))
+                            ;; dd seems to be unreliable about
+                            ;; providing the last block.  So, always
+                            ;; read one more than you think you need.
+                            (if count (concat "count=" (1+ count)) ""))))
 
     (unwind-protect
        (or (memq (call-process jka-compr-shell
@@ -260,8 +262,8 @@ the BEGth char."
       (jka-compr-delete-temp-file err-file))
 
     (and
-     end
-     (delete-region (+ start prefix len) end))
+     len
+     (delete-region (+ start prefix len) (point)))
 
     (delete-region start (+ start prefix))))
 
@@ -677,7 +679,7 @@ There should be no more than seven characters after the final '/'")
   
 (defvar jka-compr-op-table
   (make-vector 127 0)
-  "Hash table of operations supported by jka-compr")
+  "Hash table of operations supported by jka-compr.")
 
 
 (defun jka-compr-intern-operation (op)