+! Copyright (C) 2009 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
USING: combinators io io.files io.files.links io.directories
io.pathnames io.streams.string kernel math math.parser
continuations namespaces pack prettyprint sequences strings
system tools.hexdump io.encodings.binary summary accessors
-io.backend byte-arrays ;
+io.backend byte-arrays io.streams.byte-array splitting ;
IN: tar
CONSTANT: zero-checksum 256
TUPLE: tar-header name mode uid gid size mtime checksum typeflag
linkname magic version uname gname devmajor devminor prefix ;
-ERROR: checksum-error ;
-SYMBOLS: base-dir filename ;
+ERROR: checksum-error ;
-: tar-trim ( seq -- newseq ) [ "\0 " member? ] trim ;
+: trim-string ( seq -- newseq ) [ "\0 " member? ] trim ;
-: read-c-string* ( n -- str/f )
+: read-c-string ( n -- str/f )
read [ zero? ] trim-tail [ f ] when-empty ;
: read-tar-header ( -- obj )
\ tar-header new
- 100 read-c-string* >>name
- 8 read-c-string* tar-trim oct> >>mode
- 8 read-c-string* tar-trim oct> >>uid
- 8 read-c-string* tar-trim oct> >>gid
- 12 read-c-string* tar-trim oct> >>size
- 12 read-c-string* tar-trim oct> >>mtime
- 8 read-c-string* tar-trim oct> >>checksum
- read1 >>typeflag
- 100 read-c-string* >>linkname
- 6 read >>magic
- 2 read >>version
- 32 read-c-string* >>uname
- 32 read-c-string* >>gname
- 8 read tar-trim oct> >>devmajor
- 8 read tar-trim oct> >>devminor
- 155 read-c-string* >>prefix ;
-
-: header-checksum ( seq -- x )
- 148 cut-slice 8 tail-slice
- [ sum ] bi@ + 256 + ;
+ 100 read-c-string >>name
+ 8 read-c-string trim-string oct> >>mode
+ 8 read-c-string trim-string oct> >>uid
+ 8 read-c-string trim-string oct> >>gid
+ 12 read-c-string trim-string oct> >>size
+ 12 read-c-string trim-string oct> >>mtime
+ 8 read-c-string trim-string oct> >>checksum
+ read1 >>typeflag
+ 100 read-c-string >>linkname
+ 6 read >>magic
+ 2 read >>version
+ 32 read-c-string >>uname
+ 32 read-c-string >>gname
+ 8 read trim-string oct> >>devmajor
+ 8 read trim-string oct> >>devminor
+ 155 read-c-string >>prefix ;
+
+: checksum-header ( seq -- n )
+ 148 cut-slice 8 tail-slice [ sum ] bi@ + 256 + ;
: read-data-blocks ( tar-header -- )
dup size>> 0 > [
] if ;
: parse-tar-header ( seq -- obj )
- [ header-checksum ] keep over zero-checksum = [
+ [ checksum-header ] keep over zero-checksum = [
2drop
\ tar-header new
0 >>size
0 >>checksum
] [
- [ read-tar-header ] with-string-reader
+ binary [ read-tar-header ] with-byte-reader
[ checksum>> = [ checksum-error ] unless ] keep
] if ;
ERROR: unknown-typeflag ch ;
-M: unknown-typeflag summary ( obj -- str )
- ch>> 1string "Unknown typeflag: " prepend ;
-: tar-prepend-path ( path -- newpath )
- base-dir get prepend-path ;
+M: unknown-typeflag summary ( obj -- str )
+ ch>> [ "Unknown typeflag: " ] dip prefix ;
: read/write-blocks ( tar-header path -- )
binary [ read-data-blocks ] with-file-writer ;
+: prepend-current-directory ( path -- path' )
+ current-directory get prepend-path ;
+
! Normal file
: typeflag-0 ( header -- )
- dup name>> tar-prepend-path read/write-blocks ;
+ dup name>> dup "global_pax_header" = [
+ drop [ read-data-blocks ] with-string-writer drop
+ ] [
+ prepend-current-directory read/write-blocks
+ ] if ;
! Hard link
: typeflag-1 ( header -- ) unknown-typeflag ;
! Directory
: typeflag-5 ( header -- )
- name>> tar-prepend-path make-directories ;
+ name>> prepend-current-directory make-directories ;
! FIFO
: typeflag-6 ( header -- ) unknown-typeflag ;
drop ;
! <string-writer> [ read-data-blocks ] keep
! >string [ zero? ] trim-tail filename set
- ! filename get tar-prepend-path make-directories ;
+ ! filename get prepend-current-directory make-directories ;
! Multi volume continuation entry
: typeflag-M ( header -- ) unknown-typeflag ;
: typeflag-X ( header -- ) unknown-typeflag ;
: (parse-tar) ( -- )
- block-size read dup length 512 = [
+ block-size read dup length block-size = [
parse-tar-header
dup typeflag>>
{
drop
] if ;
-: parse-tar ( path -- )
- normalize-path dup parent-directory base-dir [
+: untar ( path -- )
+ normalize-path [ ] [ parent-directory ] bi [
binary [ (parse-tar) ] with-file-reader
- ] with-variable ;
+ ] with-directory ;