import struct, sys, io
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
data = open('HAVOC_NOCD.EXE','rb').read()
FO2VA = lambda fo: fo + 0x400C00
VA2FO = lambda va: va - 0x400C00

IAT = {
    0x482370:'VirtualAlloc', 0x4823cc:'LocalAlloc', 0x48240c:'ExitProcess',
    0x482390:'CreateFileA', 0x4822f4:'DirectDrawCreate', 0x4822fc:'DirectSoundCreate',
    0x48248c:'MessageBoxA', 0x48243c:'GetVersion', 0x48242c:'GetStartupInfoA',
}

def show(start, length, label=''):
    if label: print("=== %s ===" % label)
    for row in range(start, start + length, 16):
        chunk = data[row:row+16]
        ann = []
        for j in range(len(chunk)):
            f = row + j
            try:
                if data[f] == 0xe8 and f+5 <= len(data):
                    rel = struct.unpack_from('<i', data, f+1)[0]
                    tgt = (FO2VA(f+5) + rel) & 0xFFFFFFFF
                    ann.append('+%d:CALL_0x%x' % (j, tgt))
                if data[f] == 0xff and data[f+1] == 0x15 and f+6 <= len(data):
                    iat = struct.unpack_from('<I', data, f+2)[0]
                    ann.append('+%d:[%s]' % (j, IAT.get(iat, 'iat_0x%x' % iat)))
                if data[f] == 0xa3 and f+5 <= len(data):
                    va = struct.unpack_from('<I', data, f+1)[0]
                    if 0x47C000 <= va <= 0x482000:
                        ann.append('+%d:MOV[0x%x],EAX' % (j, va))
                if data[f] == 0xc3: ann.append('+%d:RET' % j)
                if data[f] == 0xc2 and f+3 <= len(data):
                    ann.append('+%d:RET%d' % (j, struct.unpack_from('<H', data, f+1)[0]))
                if data[f] == 0xe9 and f+5 <= len(data):
                    rel = struct.unpack_from('<i', data, f+1)[0]
                    tgt = (FO2VA(f+5) + rel) & 0xFFFFFFFF
                    ann.append('+%d:JMP_0x%x' % (j, tgt))
            except Exception: pass
        line = 'FO 0x%05x VA 0x%07x: %s' % (row, FO2VA(row), ' '.join('%02x' % b for b in chunk))
        if ann: line += '  [%s]' % ','.join(ann)
        print(line)

# 0x464F52 = the "both free lists at sentinel" path in 0x464E77
show(VA2FO(0x464F52), 64, "0x464F52 (empty-lists fallback in 0x464E77)")
print()
# 0x464F67 = second alloc helper called from 0x4633D1 when 0x464E77 returns NULL
show(VA2FO(0x464F67), 96, "0x464F67 (second alloc helper)")
print()
# 0x4633D1 full - 0x60 bytes to see what it does after 0x464E77 returns
show(VA2FO(0x4633D1), 96, "0x4633D1 (real allocator, full body)")