diff options
| -rw-r--r-- | guix/hash.scm | 42 | ||||
| -rw-r--r-- | tests/hash.scm | 59 |
2 files changed, 98 insertions, 3 deletions
diff --git a/guix/hash.scm b/guix/hash.scm index 92ecaf78d5..fb85f47586 100644 --- a/guix/hash.scm +++ b/guix/hash.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -25,7 +25,8 @@ #:use-module (srfi srfi-11) #:export (sha256 open-sha256-port - port-sha256)) + port-sha256 + open-sha256-input-port)) ;;; Commentary: ;;; @@ -128,4 +129,41 @@ output port." (close-port out) (get))) +(define (open-sha256-input-port port) + "Return an input port that wraps PORT and a thunk to get the hash of all the +data read from PORT. The thunk always returns the same value." + (define md + (open-sha256-md)) + + (define (read! bv start count) + (let ((n (get-bytevector-n! port bv start count))) + (if (eof-object? n) + 0 + (begin + (unless digest + (let ((ptr (bytevector->pointer bv start))) + (md-write md ptr n))) + n)))) + + (define digest #f) + + (define (finalize!) + (let ((ptr (md-read md 0))) + (set! digest (bytevector-copy (pointer->bytevector ptr 32))) + (md-close md))) + + (define (get-hash) + (unless digest + (finalize!)) + digest) + + (define (unbuffered port) + ;; Guile <= 2.0.9 does not support 'setvbuf' on custom binary input ports. + ;; If you get a wrong-type-arg error here, the fix is to upgrade Guile. :-) + (setvbuf port _IONBF) + port) + + (values (unbuffered (make-custom-binary-input-port "sha256" read! #f #f #f)) + get-hash)) + ;;; hash.scm ends here diff --git a/tests/hash.scm b/tests/hash.scm index 27751023d3..9bcd69440b 100644 --- a/tests/hash.scm +++ b/tests/hash.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -37,6 +37,14 @@ (base16-string->bytevector "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9")) +(define (supports-unbuffered-cbip?) + "Return #t if unbuffered custom binary input ports (CBIPs) are supported. +In Guile <= 2.0.9, CBIPs were always fully buffered, so the +'open-sha256-input-port' does not work there." + (false-if-exception + (setvbuf (make-custom-binary-input-port "foo" pk #f #f #f) _IONBF))) + + (test-begin "hash") (test-equal "sha256, empty" @@ -68,6 +76,55 @@ (equal? (sha256 contents) (call-with-input-file file port-sha256)))) +(test-skip (if (supports-unbuffered-cbip?) 0 4)) + +(test-equal "open-sha256-input-port, empty" + `("" ,%empty-sha256) + (let-values (((port get) + (open-sha256-input-port (open-string-input-port "")))) + (let ((str (get-string-all port))) + (list str (get))))) + +(test-equal "open-sha256-input-port, hello" + `("hello world" ,%hello-sha256) + (let-values (((port get) + (open-sha256-input-port + (open-bytevector-input-port + (string->utf8 "hello world"))))) + (let ((str (get-string-all port))) + (list str (get))))) + +(test-equal "open-sha256-input-port, hello, one two" + (list (string->utf8 "hel") (string->utf8 "lo") + (base16-string->bytevector ; echo -n hello | sha256sum + "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824") + " world") + (let-values (((port get) + (open-sha256-input-port + (open-bytevector-input-port (string->utf8 "hello world"))))) + (let* ((one (get-bytevector-n port 3)) + (two (get-bytevector-n port 2)) + (hash (get)) + (three (get-string-all port))) + (list one two hash three)))) + +(test-equal "open-sha256-input-port, hello, read from wrapped port" + (list (string->utf8 "hello") + (base16-string->bytevector ; echo -n hello | sha256sum + "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824") + " world") + (let*-values (((wrapped) + (open-bytevector-input-port (string->utf8 "hello world"))) + ((port get) + (open-sha256-input-port wrapped))) + (let* ((hello (get-bytevector-n port 5)) + (hash (get)) + + ;; Now read from WRAPPED to make sure its current position is + ;; correct. + (world (get-string-all wrapped))) + (list hello hash world)))) + (test-end) |