steve
/
factor
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

compression.zlib: Add some helper functions for streaming unzipping.

db4
Doug Coleman 2015-05-19 10:57:13 -07:00
parent c9ef2824c3
commit 870f9a73d6
1 changed files with 34 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
basis/compression/zlib/zlib.factor
View File

@ -1,8 +1,9 @@
! Copyright (C) 2009 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors alien alien.c-types alien.data alien.syntax
byte-arrays byte-vectors combinators continuations destructors
fry kernel libc math math.functions math.ranges sequences system ;
byte-arrays byte-vectors classes.struct combinators
compression.zlib.ffi continuations destructors fry kernel libc
math math.functions math.ranges sequences system ;
QUALIFIED: compression.zlib.ffi
IN: compression.zlib
@ -22,7 +23,11 @@ ERROR: zlib-failed n string ;
] if zlib-failed ;
: zlib-error ( n -- )
dup compression.zlib.ffi:Z_OK = [ drop ] [ dup zlib-error-message zlib-failed ] if ;
dup {
{ compression.zlib.ffi:Z_OK [ drop ] }
{ compression.zlib.ffi:Z_STREAM_END [ drop ] }
[ dup zlib-error-message zlib-failed ]
} case ;
: compressed-size ( byte-array -- n )
length 1001/1000 * ceiling 12 + ;
@ -46,3 +51,29 @@ ERROR: zlib-failed n string ;
: uncompress ( byte-array -- byte-array' )
[ length 5 [0,b) [ 2^ * ] with map ] keep
'[ _ (uncompress) ] attempt-all ;
: zlib-inflate-init ( -- z_stream_s )
z_stream <struct> ZLIB_VERSION over byte-length [
inflateInit_ zlib-error
] 3keep 2drop ;
! window can be 0, 15, 32, 47 (others?)
: zlib-inflate-init2 ( window -- z_stream_s )
[ z_stream <struct> ] dip ZLIB_VERSION pick byte-length [
inflateInit2_ zlib-error
] 4keep 3drop ;
: zlib-inflate-end ( z_stream -- )
inflateEnd zlib-error ;
: zlib-inflate-reset ( z_stream -- )
inflateReset zlib-error ;
: zlib-inflate ( z_stream flush -- )
inflate zlib-error ;
: zlib-inflate-get-header ( z_stream -- gz_header )
gz_header <struct> [
inflateGetHeader zlib-error
] keep ;