From: Pat Thoyts <patthoyts@users.sourceforge.net>
Date: Mon, 22 Dec 2008 01:19:34 +0000 (+0000)
Subject: Fix vfs::ztream to support 8.6 core zlib
X-Git-Url: https://privyetmir.co.uk/gitweb.cgi?a=commitdiff_plain;h=30e00ae711eb0b75a606cd06841094fa0356f385;p=tclvfs

Fix vfs::ztream to support 8.6 core zlib
---

diff --git a/ChangeLog b/ChangeLog
index 634d097..3bbf1c4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-12-22  Pat Thoyts  <patthoyts@users.sourceforge.net>
+
+	* library/mk4vfs.tcl: Fix vfs::ztream to support 8.6 core zlib
+	* library/vfslib.tcl:
+
 2008-12-12  Pat Thoyts  <patthoyts@users.sourceforge.net>
 
 	* library/zipvfs.tcl: Cleaned up the zip stream read function to
diff --git a/library/mk4vfs.tcl b/library/mk4vfs.tcl
index 8e7bbcf..0ac16db 100644
--- a/library/mk4vfs.tcl
+++ b/library/mk4vfs.tcl
@@ -168,7 +168,6 @@ namespace eval vfs::mk4 {
 		if { $sb(csize) != $sb(size) } {
 		    if {$::mk4vfs::zstreamed} {
 		      set fd [mk::channel $sb(ino) contents r]
-		      fconfigure $fd -translation binary
 		      set fd [vfs::zstream decompress $fd $sb(csize) $sb(size)]
 		    } else {
 		      set fd [vfs::memchan]
diff --git a/library/vfslib.tcl b/library/vfslib.tcl
index 6340803..64f2939 100644
--- a/library/vfslib.tcl
+++ b/library/vfslib.tcl
@@ -132,13 +132,33 @@ if {[info command rechan] != "" || ![catch {load "" rechan}]} {
     }
 
     variable ::vfs::zseq 0	;# used to generate temp zstream cmd names
-    proc vfs::zstream {mode ifd clen ilen} {
-	set cname _zstream_[incr ::vfs::zseq]
-	zlib s$mode $cname
-	set cmd [list ::vfs::zstream_handler $cname $ifd $clen $ilen s$mode]
-	set fd [rechan $cmd 2]
-	set ::vfs::_zstream_pos($fd) 0
-	return $fd
+
+    # vfs::zstream --
+    #	wrapper to manage a stacked zlib channel. If we have the core
+    #	zlib implementation then make use of that. Otherwise we can use
+    #	rechan and the tclkit zlib package to do the same thing.
+    #
+    #	  mode - compress or decompress
+    #	  ifd  - input channel (should be binary)
+    #	  clen - size of compressed data in bytes
+    #	  ilen - size of decompressed data in bytes
+    # Result:
+    #	A stacked channel then handles compression for us.
+    #
+    if {[package vsatisfies [package provide Tcl] 8.6]} {
+        proc vfs::zstream {mode ifd clen ilen} {
+            return [zlib push $mode $ifd]
+        }
+    } else {
+        proc vfs::zstream {mode ifd clen ilen} {
+            set cname _zstream_[incr ::vfs::zseq]
+            zlib s$mode $cname
+            fconfigure $fd -translation binary
+            set cmd [list ::vfs::zstream_handler $cname $ifd $clen $ilen s$mode]
+            set fd [rechan $cmd 2]
+            set ::vfs::_zstream_pos($fd) 0
+            return $fd
+        }
     }
 }