Community Learn Tools Library Leisure
search
English
Home > Web Front-end > JS Tutorial > Use jscript to implement binary reading and writing script code_javascript skills

Use jscript to implement binary reading and writing script code_javascript skills

WBOY
Release： 2016-05-16 19:03:56
Original
1198 people have browsed it

So here is a good way to access binary files from JScript. If you want to access this object from VBScript, then put it in a SWF file. This object has been used in Fury to upload files to web services and has proven to be good and fast for files in the 0-10 MB region. /** This is a fairly well optimized object which allows
to access binaries from JScript on Windows
* operating systems.
*At the end of the file is a small set of tests to show how it
* works. You will need adodb 2.5 or higher.
*This will be available on most 2000 machines and all XP or higher
*machines.
*
*Copyright: Dr. Alexander J. Turner - All rights reserved.
*Please feel free to use this code in any way you like
*As long as you have a reference place in the comments
*Written by me.
function BinaryFile(name)
{
    var adTypeBinary = 1 
    var adTypeText   = 2 
    var adSaveCreateOverWrite = 2
    // The trick - this is the 'old fassioned' not translation page
    // It lest javascript use strings to act like raw octets
    var codePage='437';

    this.path=name;

    var forward  = new Array();
    var backward = new Array();

    // Note - for better performance I should preconvert these hex
    // definitions to decimal - at some point :-) - AJT
    forward['80'] = '00C7';
    forward['81'] = '00FC';
    forward['82'] = '00E9';
    forward['83'] = '00E2';
    forward['84'] = '00E4';
    forward['85'] = '00E0';
    forward['86'] = '00E5';
    forward['87'] = '00E7';
    forward['88'] = '00EA';
    forward['89'] = '00EB';
    forward['8A'] = '00E8';
    forward['8B'] = '00EF';
    forward['8C'] = '00EE';
    forward['8D'] = '00EC';
    forward['8E'] = '00C4';
    forward['8F'] = '00C5';
    forward['90'] = '00C9';
    forward['91'] = '00E6';
    forward['92'] = '00C6';
    forward['93'] = '00F4';
    forward['94'] = '00F6';
    forward['95'] = '00F2';
    forward['96'] = '00FB';
    forward['97'] = '00F9';
    forward['98'] = '00FF';
    forward['99'] = '00D6';
    forward['9A'] = '00DC';
    forward['9B'] = '00A2';
    forward['9C'] = '00A3';
    forward['9D'] = '00A5';
    forward['9E'] = '20A7';
    forward['9F'] = '0192';
    forward['A0'] = '00E1';
    forward['A1'] = '00ED';
    forward['A2'] = '00F3';
    forward['A3'] = '00FA';
    forward['A4'] = '00F1';
    forward['A5'] = '00D1';
    forward['A6'] = '00AA';
    forward['A7'] = '00BA';
    forward['A8'] = '00BF';
    forward['A9'] = '2310';
    forward['AA'] = '00AC';
    forward['AB'] = '00BD';
    forward['AC'] = '00BC';
    forward['AD'] = '00A1';
    forward['AE'] = '00AB';
    forward['AF'] = '00BB';
    forward['B0'] = '2591';
    forward['B1'] = '2592';
    forward['B2'] = '2593';
    forward['B3'] = '2502';
    forward['B4'] = '2524';
    forward['B5'] = '2561';
    forward['B6'] = '2562';
    forward['B7'] = '2556';
    forward['B8'] = '2555';
    forward['B9'] = '2563';
    forward['BA'] = '2551';
    forward['BB'] = '2557';
    forward['BC'] = '255D';
    forward['BD'] = '255C';
    forward['BE'] = '255B';
    forward['BF'] = '2510';
    forward['C0'] = '2514';
    forward['C1'] = '2534';
    forward['C2'] = '252C';
    forward['C3'] = '251C';
    forward['C4'] = '2500';
    forward['C5'] = '253C';
    forward['C6'] = '255E';
    forward['C7'] = '255F';
    forward['C8'] = '255A';
    forward['C9'] = '2554';
    forward['CA'] = '2569';
    forward['CB'] = '2566';
    forward['CC'] = '2560';
    forward['CD'] = '2550';
    forward['CE'] = '256C';
    forward['CF'] = '2567';
    forward['D0'] = '2568';
    forward['D1'] = '2564';
    forward['D2'] = '2565';
    forward['D3'] = '2559';
    forward['D4'] = '2558';
    forward['D5'] = '2552';
    forward['D6'] = '2553';
    forward['D7'] = '256B';
    forward['D8'] = '256A';
    forward['D9'] = '2518';
    forward['DA'] = '250C';
    forward['DB'] = '2588';
    forward['DC'] = '2584';
    forward['DD'] = '258C';
    forward['DE'] = '2590';
    forward['DF'] = '2580';
    forward['E0'] = '03B1';
    forward['E1'] = '00DF';
    forward['E2'] = '0393';
    forward['E3'] = '03C0';
    forward['E4'] = '03A3';
    forward['E5'] = '03C3';
    forward['E6'] = '00B5';
    forward['E7'] = '03C4';
    forward['E8'] = '03A6';
    forward['E9'] = '0398';
    forward['EA'] = '03A9';
    forward['EB'] = '03B4';
    forward['EC'] = '221E';
    forward['ED'] = '03C6';
    forward['EE'] = '03B5';
    forward['EF'] = '2229';
    forward['F0'] = '2261';
    forward['F1'] = '00B1';
    forward['F2'] = '2265';
    forward['F3'] = '2264';
    forward['F4'] = '2320';
    forward['F5'] = '2321';
    forward['F6'] = '00F7';
    forward['F7'] = '2248';
    forward['F8'] = '00B0';
    forward['F9'] = '2219';
    forward['FA'] = '00B7';
    forward['FB'] = '221A';
    forward['FC'] = '207F';
    forward['FD'] = '00B2';
    forward['FE'] = '25A0';
    forward['FF'] = '00A0';
    backward['C7']   = '80';
    backward['FC']   = '81';
    backward['E9']   = '82';
    backward['E2']   = '83';
    backward['E4']   = '84';
    backward['E0']   = '85';
    backward['E5']   = '86';
    backward['E7']   = '87';
    backward['EA']   = '88';
    backward['EB']   = '89';
    backward['E8']   = '8A';
    backward['EF']   = '8B';
    backward['EE']   = '8C';
    backward['EC']   = '8D';
    backward['C4']   = '8E';
    backward['C5']   = '8F';
    backward['C9']   = '90';
    backward['E6']   = '91';
    backward['C6']   = '92';
    backward['F4']   = '93';
    backward['F6']   = '94';
    backward['F2']   = '95';
    backward['FB']   = '96';
    backward['F9']   = '97';
    backward['FF']   = '98';
    backward['D6']   = '99';
    backward['DC']   = '9A';
    backward['A2']   = '9B';
    backward['A3']   = '9C';
    backward['A5']   = '9D';
    backward['20A7'] = '9E';
    backward['192']  = '9F';
    backward['E1']   = 'A0';
    backward['ED']   = 'A1';
    backward['F3']   = 'A2';
    backward['FA']   = 'A3';
    backward['F1']   = 'A4';
    backward['D1']   = 'A5';
    backward['AA']   = 'A6';
    backward['BA']   = 'A7';
    backward['BF']   = 'A8';
    backward['2310'] = 'A9';
    backward['AC']   = 'AA';
    backward['BD']   = 'AB';
    backward['BC']   = 'AC';
    backward['A1']   = 'AD';
    backward['AB']   = 'AE';
    backward['BB']   = 'AF';
    backward['2591'] = 'B0';
    backward['2592'] = 'B1';
    backward['2593'] = 'B2';
    backward['2502'] = 'B3';
    backward['2524'] = 'B4';
    backward['2561'] = 'B5';
    backward['2562'] = 'B6';
    backward['2556'] = 'B7';
    backward['2555'] = 'B8';
    backward['2563'] = 'B9';
    backward['2551'] = 'BA';
    backward['2557'] = 'BB';
    backward['255D'] = 'BC';
    backward['255C'] = 'BD';
    backward['255B'] = 'BE';
    backward['2510'] = 'BF';
    backward['2514'] = 'C0';
    backward['2534'] = 'C1';
    backward['252C'] = 'C2';
    backward['251C'] = 'C3';          
    backward['2500'] = 'C4';
    backward['253C'] = 'C5';
    backward['255E'] = 'C6';
    backward['255F'] = 'C7';
    backward['255A'] = 'C8';
    backward['2554'] = 'C9';
    backward['2569'] = 'CA';
    backward['2566'] = 'CB';
    backward['2560'] = 'CC';
    backward['2550'] = 'CD';
    backward['256C'] = 'CE';
    backward['2567'] = 'CF';
    backward['2568'] = 'D0';
    backward['2564'] = 'D1';
    backward['2565'] = 'D2';
    backward['2559'] = 'D3';
    backward['2558'] = 'D4';
    backward['2552'] = 'D5';
    backward['2553'] = 'D6';
    backward['256B'] = 'D7';
    backward['256A'] = 'D8';
    backward['2518'] = 'D9';
    backward['250C'] = 'DA';
    backward['2588'] = 'DB';
    backward['2584'] = 'DC';
    backward['258C'] = 'DD';
    backward['2590'] = 'DE';
    backward['2580'] = 'DF';
    backward['3B1']  = 'E0';
    backward['DF']   = 'E1';
    backward['393']  = 'E2';
    backward['3C0']  = 'E3';
    backward['3A3']  = 'E4';
    backward['3C3']  = 'E5';
    backward['B5']   = 'E6';
    backward['3C4']  = 'E7';
    backward['3A6']  = 'E8';
    backward['398']  = 'E9';
    backward['3A9']  = 'EA';
    backward['3B4']  = 'EB';                                                              
    backward['221E'] = 'EC';
    backward['3C6']  = 'ED';
    backward['3B5']  = 'EE';
    backward['2229'] = 'EF';
    backward['2261'] = 'F0';
    backward['B1']   = 'F1';
    backward['2265'] = 'F2';
    backward['2264'] = 'F3';
    backward['2320'] = 'F4';
    backward['2321'] = 'F5';
    backward['F7']   = 'F6';
    backward['2248'] = 'F7';
    backward['B0']   = 'F8';
    backward['2219'] = 'F9';
    backward['B7']   = 'FA';
    backward['221A'] = 'FB';
    backward['207F'] = 'FC';
    backward['B2']   = 'FD';
    backward['25A0'] = 'FE';
    backward['A0']   = 'FF';     

    var hD="0123456789ABCDEF";
    this.d2h = function(d)
    {
        var h = hD.substr(d&15,1);
        while(d>15) {d>>=4;h=hD.substr(d&15,1) h;}
        return h;
    }

    this.h2d = function(h)
    {
        return parseInt(h,16);
    }

    this.WriteAll = function(what)
    {
        //Create Stream object
        var BinaryStream = WScript.CreateObject("ADODB.Stream");
        //Specify stream type - we cheat and get string but 'like' binary
        BinaryStream.Type = adTypeText;
        BinaryStream.CharSet = '437';         
        //Open the stream
        BinaryStream.Open();
        // Write to the stream
        BinaryStream.WriteText(this.Forward437(what));
        // Write the string to the disk
        BinaryStream.SaveToFile(this.path, adSaveCreateOverWrite);

        // Clearn up
        BinaryStream.Close();
    }

    this.ReadAll  = function()
    {
        //Create Stream object - needs ADO 2.5 or heigher
        var BinaryStream = WScript.CreateObject("ADODB.Stream")
        //Specify stream type - we cheat and get string but 'like' binary
        BinaryStream.Type = adTypeText;
        BinaryStream.CharSet = codePage;
        //Open the stream
        BinaryStream.Open();
        //Load the file data from disk To stream object
        BinaryStream.LoadFromFile(this.path);
        //Open the stream And get binary 'string' from the object
        var what = BinaryStream.ReadText;
        // Clean up
        BinaryStream.Close();
        return this.Backward437(what);
    }

    /* Convert a octet number to a code page 437 char code */
    this.Forward437 = function(inString)
    {
        var encArray = new Array();
        var tmp='';
        var i=0;
        var c=0;
        var l=inString.length;
        var cc;
        var h;
        for(;i        {
            c ;
            if(c==128)
            {
                encArray.push(tmp);
                tmp='';
                c=0;
            }
            cc=inString.charCodeAt(i);
            if(cc            {
                tmp =String.fromCharCode(cc);
            }      
            else
            {
                h=this.d2h(cc);
                h=forward['' h];
                tmp =String.fromCharCode(this.h2d(h));
            }
        }
        if(tmp!='')
        {
            encArray.push(tmp);
        }

        // this loop progressive concatonates the
        // array elements entil there is only one
        var ar2=new Array();
        for(;encArray.length>1;)
        {
            var l=encArray.length;
            for(var c=0;c            {
                if(c 1==l)
                {
                    ar2.push(encArray[c]);
                }
                else
                {
                    ar2.push('' encArray[c] encArray[c 1]);
                }
            }
            encArray=ar2;
            ar2=new Array();
        }
        return encArray[0];
    }
    /* Convert a code page 437 char code to a octet number*/
    this.Backward437 = function(inString)
    {
        var encArray = new Array();
        var tmp='';
        var i=0;
        var c=0;
        var l=inString.length;
        var cc;
        var h;
        for(;i        {
            c ;
            if(c==128)
            {
                encArray.push(tmp);
                tmp='';
                c=0;
            }
            cc=inString.charCodeAt(i);
            if(cc            {
                tmp =String.fromCharCode(cc);
            }
            else
            {
                h=this.d2h(cc);
                h=backward['' h];
                tmp =String.fromCharCode(this.h2d(h));
            }
        }
        if(tmp!='')
        {
            encArray.push(tmp);
        }

        // this loop progressive concatonates the
        // array elements entil there is only one
        var ar2=new Array();
        for(;encArray.length>1;)
        {
            var l=encArray.length;
            for(var c=0;c            {
                if(c 1==l)
                {
                    ar2.push(encArray[c]);
                }
                else
                {
                    ar2.push('' encArray[c] encArray[c 1]);
                }
            }
            encArray=ar2;
            ar2=new Array();
        }
        return encArray[0];
    }

}

// 使用方法：
/*
var bf0=new BinaryFile();
var crFolder = 'C:/Temp/cr'
var bf1=new BinaryFile(crFolder "/PCDV0026.JPG");
var bf2=new BinaryFile(crFolder "/PCDV0026_.JPG");
bf2.WriteAll(bf1.ReadAll());
*/

Related labels：
jscript binary
source：php.cn
Previous article：What is the dollar sign $ in js program_javascript skills Next article：Code for using ADODB.Stream to determine file encoding in JScript_javascript skills
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
function_exists() cannot determine the custom function Function test () {return true;} if (function_exists ('test')) {echo "test is function...
From 2024-04-29 11:01:01
0
3
2060
How to display the mobile version of Google Chrome Hello teacher, how can I change Google Chrome into a mobile version?
From 2024-04-23 00:22:19
0
11
2214
The child window operates the parent window, but the output does not respond. The first two sentences are executable, but the last sentence cannot be implemented.
From 2024-04-19 15:37:47
0
1
1869
There is no output in the parent window document.onclick = function(){ window.opener.document.write('I am the output of the child ...
From 2024-04-18 23:52:34
0
1
1753
Where is the courseware about CSS mind mapping? Courseware
From 2024-04-16 10:10:18
0
0
1779
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template