zend framework - Convert binary or hexadecimal string using php into 32-bit float value. Big endian \ Little endian -


how can convert 32-bit binary string 00111001101010000101110000100010 or hexadecimal string 39a85c22 float value?

for use in zend framework.

i use following class. usage output 0.00032112101325765 3 times:

$x = new application_model_binary("39a85c22"); echo "\n".$x->getfloatfrombits(0, application_model_binary::endian_big);  $x = new application_model_binary("00111001101010000101110000100010", false); echo "\n".$x->getfloatfrombits(0, application_model_binary::endian_big);  $x = new  application_model_binary("225ca839"); echo "\n".$x->getfloatfrombits(0, application_model_binary::endian_little);

and class

class application_model_binary {     const endian_big = 0;     const endian_little = 1;      private $bin;      public function __construct($string, $as_hex = true) {         if($as_hex){             $this->bin = $this->hex2bin($string);         }else{             $this->bin = $string;         }     }      /**      * convert hex-string bin-string      * @param string $data      * @return string      */     private function hex2bin($data){         $encoded = '';         $data_arr = str_split($data, 2);          foreach($data_arr $val){             $binary = base_convert($val, 16, 2);             $encoded .= str_pad($binary, 8, '0', str_pad_left);         }         return $encoded;     }      /**      * integer value out of current binary      * @param integer $start offset      * @param integer $length length      * @return integer      */     public function getvaluefrombits($start, $length = null){         return base_convert($this->getbinaryslice($start, $length), 2, 10);     }      /**      * particular piece of current binary      * @param integer $start      * @param integer $length      * @return string      */     public function getbinaryslice($start, $length = null){         if($length){             return substr($this->bin, $start, $length);         }else{             return substr($this->bin, $start);         }     }      /**      * bits count      * @return type      */     public function bits(){         return strlen($this->bin);     }      /**      * 32-bit float value @ particular offset @ specific endian type      * @param integer $offset offset      * @return float      */     public function getfloatfrombits($offset, $mode = self::endian_big){         if($mode === self::endian_big){             $sign = $this->getbinaryslice($offset, 1);             $exp = $this->getbinaryslice($offset + 1, 8);             $mantissa = "1" . $this->getbinaryslice($offset + 9, 23);         }else{             $sign = $this->getbinaryslice($offset + 24, 1);             $exp = $this->getbinaryslice($offset + 25, 7).$this->getbinaryslice($offset + 16, 1);             $mantissa = "1" . $this->getbinaryslice($offset + 17, 7) . $this->getbinaryslice($offset + 8, 8) . $this->getbinaryslice($offset, 8);         }          $mantissa = str_split($mantissa);         $exp = bindec($exp) - 127;         $base = 0;          ($i = 0; $i < 24; $i++) {             $base += (1 / pow(2, $i))*$mantissa[$i];         }         return $base * pow(2, $exp) * ($sign*-2+1);     } }

Comments

Post a Comment

Popular posts from this blog

Android layout hidden on keyboard show -

i have strange problem layout. when tap on edittext , keyboard shown edittext stay on bottom , when tap on to hide keyboard , keyboard hides , edittext go should when want input text. when tap again, keyboard shown , edittext goes down behind keyboard... <relativelayout android:layout_width="match_parent" android:layout_height="match_parent" > <scrollview android:layout_width="match_parent" android:layout_height="fill_parent" android:above="@+id/rl_commands"> <textview android:layout_width="match_parent" android:layout_height="wrap_content"/> </scrollview> <relativelayout android:layout_width="match_parent android:layout_height="24dp" android:id="@+id/rl_commands" android:alignparentbottom="true">
Read more

google app engine - 403 Forbidden POST - Flask WTForms -

i have flask application running on google app engine. trying submit form built using wtform , keep getting following error. 403 forbidden: don't have permission access requested resource. either read-protected or not readable server. location.html (part of code) <form method=post action="/home/location"> .... <button type="submit" class="btn btn-primary" value="submit"> directions </button> </form> main.py @app.route('/home/location', methods=['post', 'get']) def location(): form = cfcdirections.direction(request.form) print(request.method) if request.method == 'post' , form.validate(): print("after if") directions = cfcdirections() street_no = directions.no street = directions.street suburb = directions.suburb postcode = directions.postcode
Read more

c - Why would PK11_GenerateRandom() return an error -8023? -

i looking through internet trying find source of pk11_generaterandom() function see why function fail. have program uses function when moved new flavor of linux, fails after forking ( fork() ) since not believe there problem nss, suspect doing incorrectly disregarded in older versions of linux new 1 there issue. the openssl package same on 'good' , 'bad' server: openssl 0.9.8e-fips-rhel5 01 jul nss rpm differs though. 'good' has nss-3.12.2.0-2.el5 and bas has version nss-3.15.3-4.el5_10 the 'good' server uses quite obsolete linux: linux 2.6.18-128.el5 #1 smp wed jan 21 08:45:05 est 2009 x86_64 x86_64 x86_64 gnu/linux enterprise linux enterprise linux server release 5.3 (carthage) red hat enterprise linux server release 5.3 (tikanga) the 'bad' server newer: linux bad 2.6.18-371.4.1.el5 #1 smp wed jan 29 11:05:49 pst 2014 x86_64 x86_64 x86_64 gnu/linux oracle linux server release 5.10 red hat enterprise linux server release
Read more