radare/radare2-webui

'use strict';

const m_root = self.location.pathname.split('/').slice(0, -1).join('/');
importScripts(m_root + '/r2.js');

var howManyBytes;
var nbCols;
var configurationDone = false;

function hexPairToASCII(pair) {
    var chr = parseInt(pair, 16);
    if (chr >= 33 && chr <= 126) {
        return String.fromCharCode(chr);
    }

    return '.';
};

function getChunk(howManyBytes, addr, nbCols) {
    if (addr < 0) {
        return {
            offset: 0,
            hex: [],
            ascii: [],
            flags: [],
            modified: []
        };
    }

    var raw;

    // BUG? callback called more than once
    r2.cmd('p8 ' + howManyBytes + ' @' + addr, function(d) {
        raw = {
            offset: addr,
            hex: [],
            ascii: [],
            flags: [],
            modified: []
        };

        var hex = [];
        var ascii = '';
        for (var myIt = 0 ; myIt < howManyBytes ; myIt++) {
            var pair = d[myIt * 2] + d[(myIt * 2) + 1];
            hex.push(pair);
            ascii += hexPairToASCII(pair);
            if (myIt % nbCols === nbCols-1) {
                raw.hex.push(hex);
                raw.ascii.push(ascii);

                hex = [];
                ascii = '';
            }
        }
    });

    r2.cmdj('fij ' + addr + ' ' + (addr + howManyBytes), function(d) {
        raw.flags = d;
        for (var i in raw.flags) {
            raw.flags[i].size = parseInt(raw.flags[i].size);
        }
    });

    return raw;
}

self.onmessage = function(e) {
    if (!configurationDone || e.data.reset) {
        // Providing block size (how many byte retrieved)
        howManyBytes = e.data.howManyBytes;
        nbCols = e.data.nbCols;
        configurationDone = true;
    } else {
        // Sending the data from r2 (arg is start offset)
        // TODO: handle "substract" if partial required (first)
        var chunk = getChunk(howManyBytes, e.data.offset, nbCols);
        chunk.dir = e.data.dir;

        self.postMessage(chunk);
    }
};