img-stats.js
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/*
* img-stats
* https://github.com/jlembeck/img-stats
*
* Copyright (c) 2013 Jeffrey Lembeck
* Licensed under the MIT license.
*/
/*global require:true, console:true*/
/*global window:true*/
(function(exports) {
"use strict";
var fs = require( 'fs' );
var DOMParser = require( 'xmldom' ).DOMParser;
var isPng = function( data ){
var d = data.slice(0, 16);
return d === "89504e470d0a1a0a";
};
var isSVG = function( data ){
for( var i=0, l = data.length; i < l; i++ ){
var d = data.slice(i, i+2).toString( 'hex' );
if( d === "73" ){
i=i+2;
d = data.slice( i, i+2 ).toString( 'hex' );
if( d === "76" ){
i=i+2;
d = data.slice( i, i+2 ).toString( 'hex' );
if( d === "67" ){
return true;
}
}
}
}
return false;
};
var padHexStringToTwoDigits = function( num ) {
return ( num.length === 1 ? "0" : "" ) + num;
};
var getData = function(filename){
var data, hexString = "", hexData = [];
if( fs.readFileSync ) {
data = fs.readFileSync( filename );
hexString = data.toString( "hex" );
} else {
// PhantomJS compatible
data = fs.open( filename, "r+b" ).read();
for(var j=0, k=data.length; j<k; j++) {
hexData.push( padHexStringToTwoDigits( data.charCodeAt(j).toString(16) ));
}
hexString = hexData.join("");
}
return { data: data, hexString: hexString };
};
exports.stats = function( filename , callback ) {
var ret = {};
if( !filename ){ throw new Error("Needs a filename"); }
var da = getData( filename ),
data = da.data,
hexString = da.hexString;
if( isPng( hexString ) ){
var i = 16,
l;
for( l = hexString.length; i < l; i++ ){
var d = hexString.slice(i, i+8);
if( d === "49484452" ){
i = i+8;
break;
}
}
ret.width = parseInt(hexString.slice( i, i+8 ).toString( 16 ) , 16 );
i = i+8;
ret.height = parseInt(hexString.slice( i, i+8 ).toString( 16 ) , 16 );
ret.type = "PNG";
} else if( isSVG( hexString ) ){
ret.type = "SVG";
var pxre = /(\d+)px/;
var width, height;
if( fs.readFileSync ){
var doc = new DOMParser().parseFromString( data.toString( 'utf-8' ) );
width = doc.documentElement.getAttribute( 'width' );
height = doc.documentElement.getAttribute( 'height' );
ret.width = width.replace(pxre, "$1");
ret.height = height.replace(pxre, "$1");
} else {
var frag = window.document.createElement( "div" );
frag.innerHTML = data;
var svgelem = frag.querySelector( "svg" );
width = svgelem.getAttribute( "width" );
height = svgelem.getAttribute( "height" );
ret.width = width.replace(pxre, "$1");
ret.height = height.replace(pxre, "$1");
}
}
callback( ret );
};
exports.statsSync = function( filename , callback ) {
var ret = {};
if( !filename ){ throw new Error("Needs a filename"); }
var da = getData( filename ),
data = da.data,
hexString = da.hexString;
if( isPng( hexString ) ){
var i = 16,
l;
for( l = hexString.length; i < l; i++ ){
var d = hexString.slice(i, i+8);
if( d === "49484452" ){
i = i+8;
break;
}
}
ret.width = parseInt(hexString.slice( i, i+8 ).toString( 16 ) , 16 );
i = i+8;
ret.height = parseInt(hexString.slice( i, i+8 ).toString( 16 ) , 16 );
ret.type = "PNG";
} else if( isSVG( hexString ) ){
ret.type = "SVG";
var pxre = /(\d+)px/;
var width, height, viewBox;
if( fs.readFileSync ){
var doc = new DOMParser().parseFromString( data.toString( 'utf-8' ) );
viewBox = doc.documentElement.getAttribute( 'viewBox' );
width = doc.documentElement.getAttribute( 'width' );
if ( !width && viewBox ) {
width = viewBox.split(' ')[2];
}
height = doc.documentElement.getAttribute( 'height' );
if ( !height && viewBox ) {
height = viewBox.split(' ')[3];
}
ret.width = width.replace(pxre, "$1");
ret.height = height.replace(pxre, "$1");
} else {
var frag = window.document.createElement( "div" );
frag.innerHTML = data;
var svgelem = frag.querySelector( "svg" );
viewBox = svgelem.getAttribute( 'viewBox' );
width = svgelem.getAttribute( "width" );
if ( !width && viewBox ) {
width = viewBox.split(' ')[2];
}
height = svgelem.getAttribute( "height" );
if ( !height && viewBox ) {
height = viewBox.split(' ')[3];
}
ret.width = width.replace(pxre, "$1");
ret.height = height.replace(pxre, "$1");
}
}
return ret;
};
}(typeof exports === 'object' && exports || this));