diff options
author | Ludovic Courtès <ludo@gnu.org> | 2012-11-11 22:33:28 +0100 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2012-11-11 22:33:28 +0100 |
commit | ddc29a782eac30fcf4ff1f07677aa2896dc140e4 (patch) | |
tree | c541862eba9aa31f015386c160a380184997dec9 /guix/utils.scm | |
parent | 9e782349fe38651f6a87cc2a03f760bcbd8250bd (diff) | |
download | gnu-guix-ddc29a782eac30fcf4ff1f07677aa2896dc140e4.tar gnu-guix-ddc29a782eac30fcf4ff1f07677aa2896dc140e4.tar.gz |
Move base32 code to (guix base32).
* guix/utils.scm (bytevector-quintet-ref, bytevector-quintet-ref-right,
bytevector-quintet-length, bytevector-quintet-fold,
bytevector-quintet-fold-right, make-bytevector->base32-string,
%nix-base32-chars, %rfc4648-base32-chars, bytevector->base32-string,
bytevector->nix-base32-string, bytevector-quintet-set!,
bytevector-quintet-set-right!, base32-string-unfold,
base32-string-unfold-right, make-base32-string->bytevector,
base32-string->bytevector, nix-base32-string->bytevector): Move to...
* guix/base32.scm: ... here. New file.
* tests/utils.scm (%nix-hash, "bytevector->base32-string",
"base32-string->bytevector", "nix-base32-string->bytevector", "sha256
& bytevector->base32-string"): Move to...
* tests/base32.scm: ... here. New file
* guix-download.in, guix/derivations.scm, guix/packages.scm,
guix/snix.scm, tests/builders.scm, tests/derivations.scm: Adjust
accordingly.
* guix.scm (%public-modules): Add `base32'.
Diffstat (limited to 'guix/utils.scm')
-rw-r--r-- | guix/utils.scm | 264 |
1 files changed, 1 insertions, 263 deletions
diff --git a/guix/utils.scm b/guix/utils.scm index fa5abadc7a..ff8730aa63 100644 --- a/guix/utils.scm +++ b/guix/utils.scm @@ -33,12 +33,7 @@ #:use-module (ice-9 match) #:use-module (ice-9 format) #:autoload (system foreign) (pointer->procedure) - #:export (bytevector-quintet-length - bytevector->base32-string - bytevector->nix-base32-string - bytevector->base16-string - base32-string->bytevector - nix-base32-string->bytevector + #:export (bytevector->base16-string base16-string->bytevector sha256 @@ -81,263 +76,6 @@ evaluate to a simple datum." ;;; -;;; Base 32. -;;; - -(define bytevector-quintet-ref - (let* ((ref bytevector-u8-ref) - (ref+ (lambda (bv offset) - (let ((o (+ 1 offset))) - (if (>= o (bytevector-length bv)) - 0 - (bytevector-u8-ref bv o))))) - (ref0 (lambda (bv offset) - (bit-field (ref bv offset) 3 8))) - (ref1 (lambda (bv offset) - (logior (ash (bit-field (ref bv offset) 0 3) 2) - (bit-field (ref+ bv offset) 6 8)))) - (ref2 (lambda (bv offset) - (bit-field (ref bv offset) 1 6))) - (ref3 (lambda (bv offset) - (logior (ash (bit-field (ref bv offset) 0 1) 4) - (bit-field (ref+ bv offset) 4 8)))) - (ref4 (lambda (bv offset) - (logior (ash (bit-field (ref bv offset) 0 4) 1) - (bit-field (ref+ bv offset) 7 8)))) - (ref5 (lambda (bv offset) - (bit-field (ref bv offset) 2 7))) - (ref6 (lambda (bv offset) - (logior (ash (bit-field (ref bv offset) 0 2) 3) - (bit-field (ref+ bv offset) 5 8)))) - (ref7 (lambda (bv offset) - (bit-field (ref bv offset) 0 5))) - (refs (vector ref0 ref1 ref2 ref3 ref4 ref5 ref6 ref7))) - (lambda (bv index) - "Return the INDEXth quintet of BV." - (let ((p (vector-ref refs (modulo index 8)))) - (p bv (quotient (* index 5) 8)))))) - -(define bytevector-quintet-ref-right - (let* ((ref bytevector-u8-ref) - (ref+ (lambda (bv offset) - (let ((o (+ 1 offset))) - (if (>= o (bytevector-length bv)) - 0 - (bytevector-u8-ref bv o))))) - (ref0 (lambda (bv offset) - (bit-field (ref bv offset) 0 5))) - (ref1 (lambda (bv offset) - (logior (bit-field (ref bv offset) 5 8) - (ash (bit-field (ref+ bv offset) 0 2) 3)))) - (ref2 (lambda (bv offset) - (bit-field (ref bv offset) 2 7))) - (ref3 (lambda (bv offset) - (logior (bit-field (ref bv offset) 7 8) - (ash (bit-field (ref+ bv offset) 0 4) 1)))) - (ref4 (lambda (bv offset) - (logior (bit-field (ref bv offset) 4 8) - (ash (bit-field (ref+ bv offset) 0 1) 4)))) - (ref5 (lambda (bv offset) - (bit-field (ref bv offset) 1 6))) - (ref6 (lambda (bv offset) - (logior (bit-field (ref bv offset) 6 8) - (ash (bit-field (ref+ bv offset) 0 3) 2)))) - (ref7 (lambda (bv offset) - (bit-field (ref bv offset) 3 8))) - (refs (vector ref0 ref1 ref2 ref3 ref4 ref5 ref6 ref7))) - (lambda (bv index) - "Return the INDEXth quintet of BV, assuming quintets start from the -least-significant bits, contrary to what RFC 4648 describes." - (let ((p (vector-ref refs (modulo index 8)))) - (p bv (quotient (* index 5) 8)))))) - -(define (bytevector-quintet-length bv) - "Return the number of quintets (including truncated ones) available in BV." - (ceiling (/ (* (bytevector-length bv) 8) 5))) - -(define (bytevector-quintet-fold proc init bv) - "Return the result of applying PROC to each quintet of BV and the result of -the previous application or INIT." - (define len - (bytevector-quintet-length bv)) - - (let loop ((i 0) - (r init)) - (if (= i len) - r - (loop (1+ i) (proc (bytevector-quintet-ref bv i) r))))) - -(define (bytevector-quintet-fold-right proc init bv) - "Return the result of applying PROC to each quintet of BV and the result of -the previous application or INIT." - (define len - (bytevector-quintet-length bv)) - - (let loop ((i len) - (r init)) - (if (zero? i) - r - (let ((j (- i 1))) - (loop j (proc (bytevector-quintet-ref-right bv j) r)))))) - -(define (make-bytevector->base32-string quintet-fold base32-chars) - (lambda (bv) - "Return a base32 encoding of BV using BASE32-CHARS as the alphabet." - (let ((chars (quintet-fold (lambda (q r) - (cons (vector-ref base32-chars q) - r)) - '() - bv))) - (list->string (reverse chars))))) - -(define %nix-base32-chars - ;; See `libutil/hash.cc'. - #(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 - #\a #\b #\c #\d #\f #\g #\h #\i #\j #\k #\l #\m #\n - #\p #\q #\r #\s #\v #\w #\x #\y #\z)) - -(define %rfc4648-base32-chars - #(#\a #\b #\c #\d #\e #\f #\g #\h #\i #\j #\k #\l #\m - #\n #\o #\p #\q #\r #\s #\t #\u #\v #\w #\x #\y #\z - #\2 #\3 #\4 #\5 #\6 #\7)) - -(define bytevector->base32-string - (make-bytevector->base32-string bytevector-quintet-fold - %rfc4648-base32-chars)) - -(define bytevector->nix-base32-string - (make-bytevector->base32-string bytevector-quintet-fold-right - %nix-base32-chars)) - - -(define bytevector-quintet-set! - (let* ((setq! (lambda (bv offset start stop value) - (let ((v (bytevector-u8-ref bv offset)) - (w (arithmetic-shift value start)) - (m (bitwise-xor (1- (expt 2 stop)) - (1- (expt 2 start))))) - (bytevector-u8-set! bv offset - (bitwise-merge m w v))))) - (set0! (lambda (bv offset value) - (setq! bv offset 3 8 value))) - (set1! (lambda (bv offset value) - (setq! bv offset 0 3 (bit-field value 2 5)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 6 8 (bit-field value 0 2))))) - (set2! (lambda (bv offset value) - (setq! bv offset 1 6 value))) - (set3! (lambda (bv offset value) - (setq! bv offset 0 1 (bit-field value 4 5)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 4 8 (bit-field value 0 4))))) - (set4! (lambda (bv offset value) - (setq! bv offset 0 4 (bit-field value 1 5)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 7 8 (bit-field value 0 1))))) - (set5! (lambda (bv offset value) - (setq! bv offset 2 7 value))) - (set6! (lambda (bv offset value) - (setq! bv offset 0 2 (bit-field value 3 5)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 5 8 (bit-field value 0 3))))) - (set7! (lambda (bv offset value) - (setq! bv offset 0 5 value))) - (sets (vector set0! set1! set2! set3! set4! set5! set6! set7!))) - (lambda (bv index value) - "Set the INDEXth quintet of BV to VALUE." - (let ((p (vector-ref sets (modulo index 8)))) - (p bv (quotient (* index 5) 8) (logand value #x1f)))))) - -(define bytevector-quintet-set-right! - (let* ((setq! (lambda (bv offset start stop value) - (let ((v (bytevector-u8-ref bv offset)) - (w (arithmetic-shift value start)) - (m (bitwise-xor (1- (expt 2 stop)) - (1- (expt 2 start))))) - (bytevector-u8-set! bv offset - (bitwise-merge m w v))))) - (set0! (lambda (bv offset value) - (setq! bv offset 0 5 value))) - (set1! (lambda (bv offset value) - (setq! bv offset 5 8 (bit-field value 0 3)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 0 2 (bit-field value 3 5))))) - (set2! (lambda (bv offset value) - (setq! bv offset 2 7 value))) - (set3! (lambda (bv offset value) - (setq! bv offset 7 8 (bit-field value 0 1)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 0 4 (bit-field value 1 5))))) - (set4! (lambda (bv offset value) - (setq! bv offset 4 8 (bit-field value 0 4)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 0 1 (bit-field value 4 5))))) - (set5! (lambda (bv offset value) - (setq! bv offset 1 6 value))) - (set6! (lambda (bv offset value) - (setq! bv offset 6 8 (bit-field value 0 2)) - (or (= (+ 1 offset) (bytevector-length bv)) - (setq! bv (+ 1 offset) 0 3 (bit-field value 2 5))))) - (set7! (lambda (bv offset value) - (setq! bv offset 3 8 value))) - (sets (vector set0! set1! set2! set3! set4! set5! set6! set7!))) - (lambda (bv index value) - "Set the INDEXth quintet of BV to VALUE, assuming quintets start from -the least-significant bits." - (let ((p (vector-ref sets (modulo index 8)))) - (p bv (quotient (* index 5) 8) (logand value #x1f)))))) - -(define (base32-string-unfold f s) - "Given procedure F which, when applied to a character, returns the -corresponding quintet, return the bytevector corresponding to string S." - (define len (string-length s)) - - (let ((bv (make-bytevector (quotient (* len 5) 8)))) - (string-fold (lambda (chr index) - (bytevector-quintet-set! bv index (f chr)) - (+ 1 index)) - 0 - s) - bv)) - -(define (base32-string-unfold-right f s) - "Given procedure F which, when applied to a character, returns the -corresponding quintet, return the bytevector corresponding to string S, -starting from the right of S." - (define len (string-length s)) - - (let ((bv (make-bytevector (quotient (* len 5) 8)))) - (string-fold-right (lambda (chr index) - (bytevector-quintet-set-right! bv index (f chr)) - (+ 1 index)) - 0 - s) - bv)) - -(define (make-base32-string->bytevector base32-string-unfold base32-chars) - (let ((char->value (let loop ((i 0) - (v vlist-null)) - (if (= i (vector-length base32-chars)) - v - (loop (+ 1 i) - (vhash-consv (vector-ref base32-chars i) - i v)))))) - (lambda (s) - "Return the binary representation of base32 string S as a bytevector." - (base32-string-unfold (lambda (chr) - (or (and=> (vhash-assv chr char->value) cdr) - (error "invalid base32 character" chr))) - s)))) - -(define base32-string->bytevector - (make-base32-string->bytevector base32-string-unfold %rfc4648-base32-chars)) - -(define nix-base32-string->bytevector - (make-base32-string->bytevector base32-string-unfold-right %nix-base32-chars)) - - - -;;; ;;; Base 16. ;;; |