I have a project where I need to display djvu schemas in browser.

I found this old library on Github which, as far as I understood, converts djvu files to bmp and then puts them into canvas element.

As I said, library is old(last commit was 5 years ago), so I need to make some corrections. Main problem is that lib uses obsolete BlobBuilder.

Steps I made to solve this problem:

1. Decompress this library via Chrome DevTools


2. Initial error is at line 3774 var c = undefined != typeof MozBlobBuilder ? MozBlobBuilder : undefined != typeof WebKitBlobBuilder ? WebKitBlobBuilder : console.log(warning: cannot build blobs)


3. I commented out this line


4. Next, I commented out line c = new c; and some of following lines too.

So, now it looks this way(variable I is array buffer, and ololo1 and ololo2 are some kind of offset and limit)

var c = new Blob(new Uint8Array(new Uint8Array(I,ololo1,ololo2)))

              , b = b.createObjectURL(c)

              , c = document.getElementById(kb)

              , f = c.getContext(2d)

              , h = new Image

              , g = a[Ea >> 2]

              , i = a[Fa >> 2]

              , j = c.width

              , k = Math.round(i * j / g);



            h.onload = function()

            {

                var a = g / j;

                4 < a && (a = 4);

                1 > a && (a = 1);

                f.globalAlpha = 1;



                for (N = 0; N < a; N++)

                    f.drawImage(h, N, N, g - a + N, i - a + N, 0, 0, j, k),

                    f.globalAlpha *= 1 - 1 / a;

                R(h.complete, Image /bmp.bmp could not be decoded)

            }

            ;

            h.onerror = function(errorMsg, url, lineNumber, column, errorObj) {

                console.log(errorMsg, url, lineNumber, column, errorObj);

                console.log(Image /bmp.bmp could not be decoded!)

            }           

            ;

And now I stuck at error Image /bmp.bmp could not be decoded!(throwed in h.onerror handler).

So, my question is: what I am doing wrong?