Extract Font Name from PDF
I am using pdf.js to extract text from the pdf but the font name appears as g_d0_f6 etc. I need the font name to use the appropriate table for converting to Unicode. Here is the code derived from pdf2svg.js sample:-
var fs = require('fs');
var util = require('util');
var path = require('path');
var stream = require('stream');
// HACK few hacks to let PDF.js be loaded not as a module in global space.
require(‘./domstubs.js’).setStubs(global);
var pdfjsLib = require(‘pdfjs-dist’);
var pdfPath = process.argv[2] || ‘…/…/web/compressed.tracemonkey-pldi-09.pdf’;
var data = new Uint8Array(fs.readFileSync(pdfPath));
var loadingTask = pdfjsLib.getDocument({
data: data,
nativeImageDecoderSupport: pdfjsLib.NativeImageDecoding.DISPLAY,
});
loadingTask.promise.then(function(doc) {
var lastPromise = Promise.resolve(); // will be used to chain promises
var loadPage = function (pageNum) {
return doc.getPage(pageNum).then(function (page) {
return page.getTextContent().then(function (textContent) {
console.log(textContent);
});
});
};
for (var i = 1; i <= doc.numPages; i++) {
lastPromise = lastPromise.then(loadPage.bind(null, i));
}
return lastPromise;
}).then(function () {
console.log(‘# End of Document’);
}, function (err) {
console.error(‘Error: ’ + err);
});
Sample output:-
{ items:
[ { str: ‘bl fp=k osQ ckjs esa cPpksa ls ckrphr djsa & ;g LowQy esa fdl le; dk n`’; gS\ cPps’,
dir: ‘ltr’,
width: 396.2250000000001,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘D;k dj jgs gSa\ cPps dkSu&dkSu ls [ksy] [ksy j’,
dir: ‘ltr’,
width: 216.1650000000001,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘g’,
dir: ‘ltr’,
width: 6.42,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘s gSa\ fp=k esa fdrus cPps gSa vkSj fdrus’,
dir: ‘ltr’,
width: 173.865,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘cM+s gSa\ vkil esa dkSu D;k ckr dj jgk gksxk\ cPpksa ls fp=k esa lcosQ fy, uke lkspus’,
dir: ‘ltr’,
width: 396.54000000000013,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘dks dgasaA’,
dir: ‘ltr’,
width: 40.74,
height: 15,
transform: [Array],
fontName: ‘g_d0_f1’ },
{ str: ‘csVh cpkvks’,
dir: ‘ltr’,
width: 66.725,
height: 17,
transform: [Array],
fontName: ‘g_d0_f2’ },
{ str: ‘csVh i<+kvksA’,
dir: ‘ltr’,
width: 66.75899999999999,
height: 17,
transform: [Array],
fontName: ‘g_d0_f2’ },
{ str: ‘2018-19’,
dir: ‘ltr’,
width: 36.690000000000005,
height: 10,
transform: [Array],
fontName: ‘g_d0_f3’ } ],
styles:
{ g_d0_f1:
{ fontFamily: ‘sans-serif’,
ascent: 0.837,
descent: -0.216,
vertical: false },
g_d0_f2:
{ fontFamily: ‘sans-serif’,
ascent: 0.786,
descent: -0.181,
vertical: false },
g_d0_f3:
{ fontFamily: ‘sans-serif’,
ascent: 0.9052734375,
descent: -0.2119140625,
vertical: false } } }
And here is the pdf that uses embedded fonts: http://ncert.nic.in/textbook/pdf/ahhn101.pdf
Here is a related question but the suggested commonObjs is empty: pdf.js get info about embedded fonts
#javascript