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base64: Inline arithmetic operations. 

* guix/base64.scm (define-alias): New macro.
  (fxbit-field, fxarithmetic-shift, fxarithmetic-shift-left, fxand,
  fxior, fxxor): New aliases.
This commit is contained in:
Ludovic Courtès 2015-01-09 01:01:04 +01:00
parent 05f0607bfc
commit b2ad9d9b08
1 changed files with 20 additions and 2 deletions
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22
guix/base64.scm
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@ -4,6 +4,8 @@
;; (guix base64) by Nikita Karetnikov <nikita@karetnikov.org> on
;; February 12, 2014.
;;
;; Some optimizations made by Ludovic Courtès <ludo@gnu.org>, 2015.
;;
;; Copyright © 2009, 2010 Göran Weinholt <goran@weinholt.se>
;;
;; This program is free software: you can redistribute it and/or modify
@ -33,7 +35,23 @@
(only (srfi :13 strings)
string-index
string-prefix? string-suffix?
string-concatenate string-trim-both))
string-concatenate string-trim-both)
(only (guile) ash logior))
(define-syntax define-alias
(syntax-rules ()
((_ new old)
(define-syntax new (identifier-syntax old)))))
;; Force the use of Guile's own primitives to avoid the overhead of its 'fx'
;; procedures.
(define-alias fxbit-field bitwise-bit-field)
(define-alias fxarithmetic-shift ash)
(define-alias fxarithmetic-shift-left ash)
(define-alias fxand logand)
(define-alias fxior logior)
(define-alias fxxor logxor)
(define base64-alphabet
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
@ -209,4 +227,4 @@
line-length #f base64-alphabet port)
(display (string-append "\n-----END " type "-----\n") port))
((port type bv)
(put-delimited-base64 port type bv 76)))))
(put-delimited-base64 port type bv 76)))))