75 lines
2.2 KiB
Factor
75 lines
2.2 KiB
Factor
! Copyright (C) 2009 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors alien alien.c-types alien.data alien.syntax
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byte-arrays byte-vectors classes.struct combinators
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compression.zlib.ffi continuations destructors fry kernel libc
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math math.functions math.ranges sequences system ;
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IN: compression.zlib
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ERROR: zlib-failed n string ;
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: zlib-error-message ( n -- * )
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dup compression.zlib.ffi:Z_ERRNO = [
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drop errno "native libc error"
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] [
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dup
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neg ! zlib error codes are negative
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{
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"no error" "libc_error"
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"stream error" "data error"
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"memory error" "buffer error" "zlib version error"
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} ?nth
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] if zlib-failed ;
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: zlib-error ( n -- )
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dup {
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{ compression.zlib.ffi:Z_OK [ drop ] }
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{ compression.zlib.ffi:Z_STREAM_END [ drop ] }
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[ dup zlib-error-message zlib-failed ]
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} case ;
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: compressed-size ( byte-array -- n )
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length 1001/1000 * ceiling 12 + ;
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: compress ( byte-array -- byte-array' )
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[
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compressed-size
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[ <byte-vector> dup underlying>> ] keep ulong <ref>
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] keep [
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dup length compression.zlib.ffi:compress zlib-error
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] keepd ulong deref >>length B{ } like ;
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: (uncompress) ( length byte-array -- byte-array )
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[
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[ drop [ malloc &free ] [ ulong <ref> ] bi ]
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[ nip dup length ] 2bi
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[ compression.zlib.ffi:uncompress zlib-error ] 4keep
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2drop ulong deref memory>byte-array
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] with-destructors ;
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: uncompress ( byte-array -- byte-array' )
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[ length 5 [0,b) [ 2^ * ] with map ] keep
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'[ _ (uncompress) ] attempt-all ;
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: zlib-inflate-init ( -- z_stream_s )
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z_stream <struct>
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dup ZLIB_VERSION over byte-length inflateInit_ zlib-error ;
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! window can be 0, 15, 32, 47 (others?)
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: zlib-inflate-init2 ( window -- z_stream_s )
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[ z_stream <struct> dup ] dip
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ZLIB_VERSION pick byte-length inflateInit2_ zlib-error ;
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: zlib-inflate-end ( z_stream -- )
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inflateEnd zlib-error ;
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: zlib-inflate-reset ( z_stream -- )
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inflateReset zlib-error ;
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: zlib-inflate ( z_stream flush -- )
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inflate zlib-error ;
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: zlib-inflate-get-header ( z_stream -- gz_header )
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gz_header <struct> [ inflateGetHeader zlib-error ] keep ;
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