Parser for SECCON 2019 final q4 box4

print.js

// box4
const fs = require('fs');

const filename = process.argv[2];
const parseTrace =
    (fileName) => {
      const trace = JSON.parse(fs.readFileSync(fileName, 'utf-8'));
      const base_addr = parseInt(trace[0].base_addr, 16);
      const branches = trace.filter(e => (e.inst_addr != undefined)).map(e => {
        if (e.event === 'call') {
          return {
            'addr': (parseInt(e.inst_addr, 16) - base_addr).toString(16),
            'target': (parseInt(e.target_addr, 16) - base_addr).toString(16)
          };
        }
        return {
          'addr': (parseInt(e.inst_addr, 16) - base_addr).toString(16),
          'taken': e.branch_taken
        };
      });
      return branches;
    }

const print =
    (branches) => {
      for (var i = 0; i < branches.length;) {
        const b = branches[i];
        var count = 0;
        if (b.target === '1ead') {
          console.log('ADD Ev,Gv');
          i += 17;
          continue;
        }
        if (b.target === '2159') {
          var zf = false;
          for (;;) {
            const c = branches[i];
            if (c.addr == '21f8') break;
            if (c.addr == '1d06') zf = true;
            i++;
          }
          i++;
          console.log(`CMP Ev,Gv ZF=${zf}`);
          continue;
        }
        if (b.target === '2389') {
          console.log('INC r32');
          i += 5;
          continue;
        }
        if (b.target === '28fd') {
          console.log('JNLE / JG');
          i += 3;
          continue;
        }
        if (b.addr === '2949') {
          console.log('JNLE / JG taken');
          i += 1;
          continue;
        }
        if (b.target === '2ebd') {
          console.log('mov r32, imm32');
          i += 8;
          continue;
        }
        if (b.target === '317d') {
          console.log('short Jb');
          i += 5;
          continue;
        }
        if (b.target === '3269') {
          console.log('HLT->END');
          i += 33;
          continue;
        }
        if (b.addr === '97e') {
          console.log('PROLOGUE');
          i += 79;
          continue;
        }
        if (b.target === '2645') {
          console.log('JZ/JE');
          i += 2;
          continue;
        }
        if (b.addr === '2672') {
          console.log('JZ/JE taken');
          i += 1;
          continue;
        }
        if (b.target === '2695') {
          console.log('JNZ/JNE');
          i += 2;
          continue;
        }
        if (b.addr === '26c2') {
          console.log('JNZ/JNE taken?');
          i += 1;
          continue;
        }
        if (b.target === '23e7') {
          var zf = false;
          var of = false;
          for (;;) {
            const c = branches[i];
            if (c.addr === '1d67') break;
            if (c.addr === '1d41') of = true;
            if (c.addr === '1d06') zf = true;
            i++;
          }
          i++;
          console.log(`DEC r32 ZF=${zf} OF=${of}`);
          // console.log(`DEC r32`);
          // i++;
          continue;
        }
        if (b.target === '251a') {
          console.log('PUSH imm32');
          i += 13;
          continue;
        }
        if (b.target === '24c3') {
          console.log('POP r32');
          i += 7;
          continue;
        }
        if (b.target === '2c33') {
          console.log('MOV r/m32,r32');
          i += 11;
          continue;
        }
        if (b.target === '3144') {
          console.log('JMP near Jz');
          i += 7;
          continue;
        }
        if (parseInt(b.addr, 16) >= 0x39e7 && parseInt(b.addr, 16) < 0x3b86) {
          i += 1;
          continue;
        }
        while (i < branches.length && branches[i].addr == b.addr &&
               branches[i].taken == b.taken) {
          count++;
          i++;
        }
        console.log(`${JSON.stringify(b)} * ${count}`);
      }
      console.log(branches.length);
    }

const branches = parseTrace(filename);
print(branches);