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utils: Support zstd compression via Guile-zstd.

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* guix/utils.scm (lzip-port): Return a single value.
(zstd-port): New procedure.
(decompressed-port, compressed-output-port): Add 'zstd' case.
* tests/utils.scm (test-compression/decompression): Test 'zstd' when
the (zstd) module is available.
This commit is contained in:
Ludovic Courtès
2020-12-26 23:01:05 +01:00
parent 0d04658710
commit db0cecdf6b
2 changed files with 15 additions and 3 deletions
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12
guix/utils.scm
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@@ -210,7 +210,13 @@ buffered data is lost."
"Return the lzip port produced by calling PROC (a symbol) on PORT and ARGS.
Raise an error if lzlib support is missing."
(let ((make-port (module-ref (resolve-interface '(lzlib)) proc)))
(values (make-port port) '())))
(make-port port)))
(define (zstd-port proc port . args)
"Return the zstd port produced by calling PROC (a symbol) on PORT and ARGS.
Raise an error if zstd support is missing."
(let ((make-port (module-ref (resolve-interface '(zstd)) proc)))
(make-port port)))
(define (decompressed-port compression input)
"Return an input port where INPUT is decompressed according to COMPRESSION,
@@ -222,6 +228,8 @@ a symbol such as 'xz."
('gzip (filtered-port `(,%gzip "-dc") input))
('lzip (values (lzip-port 'make-lzip-input-port input)
'()))
('zstd (values (zstd-port 'make-zstd-input-port input)
'()))
(_ (error "unsupported compression scheme" compression))))
(define (call-with-decompressed-port compression port proc)
@@ -281,6 +289,8 @@ program--e.g., '(\"--fast\")."
('gzip (filtered-output-port `(,%gzip "-c" ,@options) output))
('lzip (values (lzip-port 'make-lzip-output-port output)
'()))
('zstd (values (zstd-port 'make-zstd-output-port output)
'()))
(_ (error "unsupported compression scheme" compression))))
(define* (call-with-compressed-output-port compression port proc

6
tests/utils.scm
View File

@@ -228,8 +228,10 @@ skip these tests."
get-bytevector-all)))))
(for-each test-compression/decompression
'(gzip xz lzip)
(list (const #t) (const #t) (const #t)))
`(gzip xz lzip zstd)
(list (const #t) (const #t) (const #t)
(lambda ()
(resolve-module '(zstd) #t #f #:ensure #f))))
;; This is actually in (guix store).
(test-equal "store-path-package-name"