;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages libdaemon)
  #:use-module (guix licenses)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system gnu))

(define-public libdaemon
  (package
    (name "libdaemon")
    (version "0.14")
    (source (origin
             (method url-fetch)
             (uri (list
                   (string-append
                    "mirror://debian/pool/main/libd/libdaemon/libdaemon_"
                    version ".orig.tar.gz")
                   "http://pkgs.fedoraproject.org/repo/pkgs/libdaemon/libdaemon-0.14.tar.gz/509dc27107c21bcd9fbf2f95f5669563/libdaemon-0.14.tar.gz"

                   ;; This used to be the canonical URL but it vanished.
                   ;; See <http://bugs.gnu.org/18639>.
                   ;; (string-append
                   ;;  "http://0pointer.de/lennart/projects/libdaemon/libdaemon-"
                   ;;  version ".tar.gz")
                   ))
             (sha256
              (base32
               "0d5qlq5ab95wh1xc87rqrh1vx6i8lddka1w3f1zcqvcqdxgyn8zx"))
             (file-name (string-append name "-" version ".tar.gz"))))
    (build-system gnu-build-sy#include &quot;references.hh&quot;
#include &quot;hash.hh&quot;
#include &quot;util.hh&quot;
#include &quot;archive.hh&quot;

#include &lt;map&gt;
#include &lt;cstdlib&gt;


namespace nix {


static unsigned int refLength = 32; /* characters */


static void search(const unsigned char * s, unsigned int len, 
    StringSet &amp; hashes, StringSet &amp; seen)
{
    static bool initialised = false;
    static bool isBase32[256];
    if (!initialised) {
        for (unsigned int i = 0; i &lt; 256; ++i) isBase32[i] = false;
        for (unsigned int i = 0; i &lt; base32Chars.size(); ++i)
            isBase32[(unsigned char) base32Chars[i]] = true;
        initialised = true;
    }
    
    for (unsigned int i = 0; i + refLength &lt;= len; ) {
        int j;
        bool match = true;
        for (j = refLength - 1; j &gt;= 0; --j)
            if (!isBase32[(unsigned char) s[i + j]]) {
                i += j + 1;
                match = false;
                break;
            }
        if (!match) continue;
        string ref((const char *) s + i, refLength);
        if (hashes.find(ref) != hashes.end()) {
            debug(format(&quot;found reference to `%1%&apos; at offset `%2%&apos;&quot;)
                  % ref % i);
            seen.insert(ref);
            hashes.erase(ref);
        }
        ++i;
    }
}


struct RefScanSink : Sink
{
    HashSink hashSink;
    StringSet hashes;
    StringSet seen;

    string tail;

    RefScanSink() : hashSink(htSHA256) { }
    
    void operator () (const unsigned char * data, size_t len);
};


void RefScanSink::operator () (const unsigned char * data, size_t len)
{
    hashSink(data,