def map_exports(exports, verbose=True):
    """ gets an array of [(vaddress, name),..] and writes it to db"""
    if verbose:
        print "[+] going for %d exports" % (len(exports))
    for addr, export_name in exports:
        print "[+] creating export", export_name
        # check that there are no existing segments in that address
        if idc.SegStart(addr) == idc.BADADDR:
            print "[+] creating seg: 0x%08X: %d" % (addr, 4)
            idc.AddSegEx(addr,
                         addr + 4, 0, 0,
                         idaapi.saRelPara, idaapi.scPub,
                         idc.ADDSEG_FILLGAP)
        elif verbose:
            print "[!] Skipping creation of existing segment.."
        # set it as execuable
        idc.SetSegmentAttr(addr, idc.SEGATTR_PERM, SEGPERM_EXEC)
        if verbose:
            print "[+] making name: %s" % (export_name)
        make_name(addr, export_name) 

def main(argv=None):
    if argv is None:
        argv = sys.argv[:]

    try:
        seg = prompt_for_segment()
    except BadInputError:
        logger.error('bad input, exiting...')
        return -1

    with open(seg.path, 'rb') as f:
        buf = f.read()

    seglen = len(buf)
    if seglen % 0x1000 != 0:
        seglen = seglen + (0x1000 - (seglen % 0x1000))

    if not idc.AddSeg(seg.addr, seg.addr + seglen, 0, 1, 0, idaapi.scPub):
        logger.error('failed to add segment: 0x%x', seg.addr)
        return -1

    if not idc.set_segm_name(seg.addr, seg.name):
        logger.warning('failed to rename segment: %s', seg.name)

    if not idc.set_segm_class(seg.addr, 'CODE'):
        logger.warning('failed to set segment class CODE: %s', seg.name)

    if not idc.set_segm_attr(seg.addr, SEGATTR_ALIGN, idc.saRelPara):
        logger.warning('failed to align segment: %s', seg.name)

    ida_bytes.patch_bytes(seg.addr, buf) 

def myAddSeg(startea, endea, base, use32, name, clas):
    s = idaapi.segment_t()
    s.start_ea = startea
    s.end_ea   = endea
    s.sel      = idaapi.setup_selector(base)
    s.bitness  = use32
    s.align    = idaapi.saRelPara
    s.comb     = idaapi.scPub
    #idaapi.add_segm_ex(s, name, clas, idaapi.ADDSEG_NOSREG|idaapi.ADDSEG_OR_DIE)
    idaapi.add_segm(base, startea, endea, name, clas) 

def append_segment(segment_name):
    """ Add a new segment to the IDB file and return its starting address.
    Information about function arguments will be stored here. Only works if the
    segment name is not used yet. This does not affect the original binary.

    Arguments:
    segment_name -- the name of the segment to be added
    """
    for segment in idautils.Segments():
        if idc.SegName(segment) == segment_name:
            g_logger.warning('Segment ' + segment_name + ' already exists')
            return idc.SegStart(segment)

    new_segment_start = get_end_of_last_segment()
    g_logger.debug('Adding new segment at 0x%08x' % new_segment_start)
    if not idc.AddSeg(new_segment_start, (new_segment_start+NEW_SEGMENT_SIZE),
                      0, 1, 0, idaapi.scPub) == 1:
        raise FailedToAppendSegmentException('Could not add segment')
    # set new segment's attributes
    if not idc.RenameSeg(new_segment_start, segment_name):
        raise FailedToAppendSegmentException('Could not rename segment')
    if not idc.SetSegClass(new_segment_start, 'DATA'):
        raise FailedToAppendSegmentException('Could not set segment class')
    if not idc.SegAlign(new_segment_start, idc.saRelPara):
        raise FailedToAppendSegmentException('Could not align segment')
    if not idc.SetSegAddressing(new_segment_start, 1):  # 1 -- 32 bit
        raise FailedToAppendSegmentException(
            'Could not set segment addressing')
    return new_segment_start 

def map_segments(segments, dsc_file, verbose=True):
    for segaddr, segsize, segdata in segments:
        print "[+] creating seg: 0x%08X: %d" % (segaddr, segsize)
        # check that there are no existing segments in that address
        if idc.SegStart(segaddr) == idc.BADADDR:
            idc.AddSegEx(segaddr,
                         segaddr + segsize, 0, 0,
                         idaapi.saRelPara, idaapi.scPub,
                         idc.ADDSEG_FILLGAP)
            # set it as read-only
            idc.SetSegmentAttr(segaddr, idc.SEGATTR_PERM, SEGPERM_READ)
        else:
            print "[!] Skipping creation of existing segment.."

        # after mapping the segment, write the data to the db.
        try:
            for addr, size, macho_offset in segdata:
                dsc_file.seek(macho_offset)
                memcpy(addr, dsc_file.read(size))
                if verbose:
                    print "0x%X, 0x%06X, 0x%06X: %s" % (addr,
                                                        size,
                                                        macho_offset,
                                                        dsc_file.read(size))
        except Exception:
            print segdata
            raise 

def map_shared_bridges(dsc_file, adrfind):
    """ finds branch islands in a given dyld_shared_cache file,
        maps them to IDA's db and extract its addresses """
    dsc_file.seek(0, 2)
    filesize = dsc_file.tell()
    dsc_file.seek(0)
    ACCESS_READ = 1
    a = mmap.mmap(dsc_file.fileno(), length=filesize, access=ACCESS_READ)
    reexp = re.compile("\xcf\xfa\xed\xfe.{340,360}dyld_shared_cache_branch_islands")
    print "[+] scanning dsc for BRANCH ISLANDS"
    # this list will hold all our branch_islands segments
    branch_islands_segments = []
    jmp_to_code = collections.defaultdict(list)
    for ma in reexp.finditer(a):
        print "[+] WRITING BRANCH ISLAND: 0x%08X" % (ma.start())
        fif = FileInFile(dsc_file, ma.start())
        m = MachO_patched(fif)
        if _IN_IDA:
            for seg in m.segments:
                for sec in seg.sections:
                    idc.AddSegEx(sec.addr,
                                 sec.addr + sec.size, 0, 0,
                                 idaapi.saRelPara, idaapi.scPub,
                                 idc.ADDSEG_FILLGAP)
                    name = "branch_islands_%X%s%s" % (ma.start(), seg.segname, sec.sectname)
                    idc.RenameSeg(sec.addr, name)
                    idc.SetSegClass(sec.addr, "CODE")
                    idc.SetSegAddressing(sec.addr, 2)
                    dsc_file.seek(sec.offset)
                    memcpy(sec.addr, dsc_file.read(sec.size))
                    branch_islands_segments.append(sec.addr)
                    # make code
                    codeea = sec.addr
                    print "Going through the code!"
                    while codeea < (sec.addr + sec.size):
                        res = idc.MakeCode(codeea)
                        if not res:
                            print "[!] EA:0x%X ERR while making code" % codeea
                            codeea += 4
                            continue

                        d = idc.GetDisasm(codeea)
                        # if it's a "B     0x4dd13550"
                        if d.startswith("B "):
                            addr = d.split()[1]
                            if addr.startswith("0x"):
                                branchaddr = int(addr, 16)
                                jmp_to_code[branchaddr].append(codeea)
                                #   idc.MakeRptCmt(codeea, "0x%X was taken!" % branchaddr)

                        codeea = idc.FindUnexplored(codeea, idc.SEARCH_DOWN)
    label_and_fix_branch_islands(dsc_file, adrfind, jmp_to_code)