C++ DataExtractor::GetU32方法代码示例

bool
DWARFCompileUnit::Extract(const DataExtractor &debug_info, uint32_t* offset_ptr)
{
    Clear();

    m_offset = *offset_ptr;

    if (debug_info.ValidOffset(*offset_ptr))
    {
        dw_offset_t abbr_offset;
        const DWARFDebugAbbrev *abbr = m_dwarf2Data->DebugAbbrev();
        m_length        = debug_info.GetU32(offset_ptr);
        m_version       = debug_info.GetU16(offset_ptr);
        abbr_offset     = debug_info.GetU32(offset_ptr);
        m_addr_size     = debug_info.GetU8 (offset_ptr);

        bool length_OK = debug_info.ValidOffset(GetNextCompileUnitOffset()-1);
        bool version_OK = SymbolFileDWARF::SupportedVersion(m_version);
        bool abbr_offset_OK = m_dwarf2Data->get_debug_abbrev_data().ValidOffset(abbr_offset);
        bool addr_size_OK = ((m_addr_size == 4) || (m_addr_size == 8));

        if (length_OK && version_OK && addr_size_OK && abbr_offset_OK && abbr != NULL)
        {
            m_abbrevs = abbr->GetAbbreviationDeclarationSet(abbr_offset);
            return true;
        }

        // reset the offset to where we tried to parse from if anything went wrong
        *offset_ptr = m_offset;
    }

    return false;
}

Error
AdbClient::Stat (const FileSpec &remote_file, uint32_t &mode, uint32_t &size, uint32_t &mtime)
{
    auto error = StartSync ();
    if (error.Fail ())
        return error;

    const std::string remote_file_path (remote_file.GetPath (false));
    error = SendSyncRequest (kSTAT, remote_file_path.length (), remote_file_path.c_str ());
    if (error.Fail ())
        return Error ("Failed to send request: %s", error.AsCString ());

    static const size_t stat_len = strlen (kSTAT);
    static const size_t response_len = stat_len + (sizeof (uint32_t) * 3);

    std::vector<char> buffer (response_len);
    error = ReadAllBytes (&buffer[0], buffer.size ());
    if (error.Fail ())
        return Error ("Failed to read response: %s", error.AsCString ());

    DataExtractor extractor (&buffer[0], buffer.size (), eByteOrderLittle, sizeof (void*));
    offset_t offset = 0;

    const void* command = extractor.GetData (&offset, stat_len);
    if (!command)
        return Error ("Failed to get response command");
    const char* command_str = static_cast<const char*> (command);
    if (strncmp (command_str, kSTAT, stat_len))
        return Error ("Got invalid stat command: %s", command_str);

    mode = extractor.GetU32 (&offset);
    size = extractor.GetU32 (&offset);
    mtime = extractor.GetU32 (&offset);
    return Error ();
}

// Parse a FreeBSD NT_PRSTATUS note - see FreeBSD sys/procfs.h for details.
static void
ParseFreeBSDPrStatus(ThreadData *thread_data, DataExtractor &data,
                     ArchSpec &arch)
{
    lldb::offset_t offset = 0;
    bool have_padding = (arch.GetMachine() == llvm::Triple::mips64 ||
                         arch.GetMachine() == llvm::Triple::x86_64);
    int pr_version = data.GetU32(&offset);

    Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
    if (log)
    {
        if (pr_version > 1)
            log->Printf("FreeBSD PRSTATUS unexpected version %d", pr_version);
    }

    if (have_padding)
        offset += 4;
    offset += 28;       // pr_statussz, pr_gregsetsz, pr_fpregsetsz, pr_osreldate
    thread_data->signo = data.GetU32(&offset); // pr_cursig
    offset += 4;        // pr_pid
    if (have_padding)
        offset += 4;
    
    size_t len = data.GetByteSize() - offset;
    thread_data->gpregset = DataExtractor(data, offset, len);
}

// Parse a FreeBSD NT_PRSTATUS note - see FreeBSD sys/procfs.h for details.
static void
ParseFreeBSDPrStatus(ThreadData &thread_data, DataExtractor &data,
                     ArchSpec &arch)
{
    lldb::offset_t offset = 0;
    bool lp64 = (arch.GetMachine() == llvm::Triple::aarch64 ||
                 arch.GetMachine() == llvm::Triple::mips64 ||
                 arch.GetMachine() == llvm::Triple::ppc64 ||
                 arch.GetMachine() == llvm::Triple::x86_64);
    int pr_version = data.GetU32(&offset);

    Log *log (GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
    if (log)
    {
        if (pr_version > 1)
            log->Printf("FreeBSD PRSTATUS unexpected version %d", pr_version);
    }

    // Skip padding, pr_statussz, pr_gregsetsz, pr_fpregsetsz, pr_osreldate
    if (lp64)
        offset += 32;
    else
        offset += 16;

    thread_data.signo = data.GetU32(&offset); // pr_cursig
    thread_data.tid = data.GetU32(&offset); // pr_pid
    if (lp64)
        offset += 4;

    size_t len = data.GetByteSize() - offset;
    thread_data.gpregset = DataExtractor(data, offset, len);
}

Error
ELFLinuxPrPsInfo::Parse(DataExtractor &data, ArchSpec &arch)
{
    Error error;
    ByteOrder byteorder = data.GetByteOrder();
    if (GetSize(arch) > data.GetByteSize())
    {
        error.SetErrorStringWithFormat("NT_PRPSINFO size should be %lu, but the remaining bytes are: %lu",
                                       GetSize(arch), data.GetByteSize());
        return error;
    }

    switch(arch.GetCore())
    {
        case ArchSpec::eCore_s390x_generic:
        case ArchSpec::eCore_x86_64_x86_64:
            data.ExtractBytes(0, sizeof(ELFLinuxPrPsInfo), byteorder, this);
            break;
        case ArchSpec::eCore_x86_32_i386:
        case ArchSpec::eCore_x86_32_i486:
        {
            // Parsing from a 32 bit ELF core file, and populating/reusing the structure
            // properly, because the struct is for the 64 bit version
            size_t size = 0;
            offset_t offset = 0;

            pr_state = data.GetU8(&offset);
            pr_sname = data.GetU8(&offset);
            pr_zomb = data.GetU8(&offset);
            pr_nice = data.GetU8(&offset);

            pr_flag = data.GetU32(&offset);
            pr_uid = data.GetU16(&offset);
            pr_gid = data.GetU16(&offset);

            pr_pid = data.GetU32(&offset);
            pr_ppid = data.GetU32(&offset);
            pr_pgrp = data.GetU32(&offset);
            pr_sid = data.GetU32(&offset);

            size = 16;
            data.ExtractBytes(offset, size, byteorder, pr_fname);
            offset += size;

            size = 80;
            data.ExtractBytes(offset, size, byteorder, pr_psargs);
            offset += size;

            break;
        }
        default:
            error.SetErrorStringWithFormat("ELFLinuxPrPsInfo::%s Unknown architecture", __FUNCTION__);
            break;
    }

    return error;
}

bool
DynamicLoaderDarwinKernel::ReadKextSummaryHeader ()
{
    Mutex::Locker locker(m_mutex);

    // the all image infos is already valid for this process stop ID

    m_kext_summaries.clear();
    if (m_kext_summary_header_ptr_addr.IsValid())
    {
        const uint32_t addr_size = m_kernel.GetAddressByteSize ();
        const ByteOrder byte_order = m_kernel.GetByteOrder();
        Error error;
        // Read enough bytes for a "OSKextLoadedKextSummaryHeader" structure
        // which is currenty 4 uint32_t and a pointer.
        uint8_t buf[24];
        DataExtractor data (buf, sizeof(buf), byte_order, addr_size);
        const size_t count = 4 * sizeof(uint32_t) + addr_size;
        const bool prefer_file_cache = false;
        if (m_process->GetTarget().ReadPointerFromMemory (m_kext_summary_header_ptr_addr, 
                                                          prefer_file_cache,
                                                          error,
                                                          m_kext_summary_header_addr))
        {
            // We got a valid address for our kext summary header and make sure it isn't NULL
            if (m_kext_summary_header_addr.IsValid() && 
                m_kext_summary_header_addr.GetFileAddress() != 0)
            {
                const size_t bytes_read = m_process->GetTarget().ReadMemory (m_kext_summary_header_addr, prefer_file_cache, buf, count, error);
                if (bytes_read == count)
                {
                    uint32_t offset = 0;
                    m_kext_summary_header.version = data.GetU32(&offset);
                    if (m_kext_summary_header.version >= 2)
                    {
                        m_kext_summary_header.entry_size = data.GetU32(&offset);
                    }
                    else
                    {
                        // Versions less than 2 didn't have an entry size, it was hard coded
                        m_kext_summary_header.entry_size = KERNEL_MODULE_ENTRY_SIZE_VERSION_1;
                    }
                    m_kext_summary_header.entry_count = data.GetU32(&offset);
                    return true;
                }
            }
        }
    }
    m_kext_summary_header_addr.Clear();
    return false;
}

bool CommunicationKDP::SendRawRequest(
    uint8_t command_byte,
    const void *src,  // Raw packet payload bytes
    uint32_t src_len, // Raw packet payload length
    DataExtractor &reply_packet, Status &error) {
  PacketStreamType request_packet(Stream::eBinary, m_addr_byte_size,
                                  m_byte_order);
  // Size is header + address size + uint32_t length
  const uint32_t command_length = 8 + src_len;
  const CommandType command = (CommandType)command_byte;
  MakeRequestPacketHeader(command, request_packet, command_length);
  request_packet.PutRawBytes(src, src_len);

  if (SendRequestAndGetReply(command, request_packet, reply_packet)) {
    lldb::offset_t offset = 8;
    uint32_t kdp_error = reply_packet.GetU32(&offset);
    if (kdp_error && (command_byte != KDP_DUMPINFO))
      error.SetErrorStringWithFormat("request packet 0x%8.8x failed (error %u)",
                                     command_byte, kdp_error);
    else {
      error.Clear();
      return true;
    }
  } else {
    error.SetErrorString("failed to send packet");
  }
  return false;
}

//----------------------------------------------------------------------
// ParseDOSHeader
//----------------------------------------------------------------------
bool ObjectFilePECOFF::ParseDOSHeader(DataExtractor &data,
                                      dos_header_t &dos_header) {
  bool success = false;
  lldb::offset_t offset = 0;
  success = data.ValidOffsetForDataOfSize(0, sizeof(dos_header));

  if (success) {
    dos_header.e_magic = data.GetU16(&offset); // Magic number
    success = dos_header.e_magic == IMAGE_DOS_SIGNATURE;

    if (success) {
      dos_header.e_cblp = data.GetU16(&offset); // Bytes on last page of file
      dos_header.e_cp = data.GetU16(&offset);   // Pages in file
      dos_header.e_crlc = data.GetU16(&offset); // Relocations
      dos_header.e_cparhdr =
          data.GetU16(&offset); // Size of header in paragraphs
      dos_header.e_minalloc =
          data.GetU16(&offset); // Minimum extra paragraphs needed
      dos_header.e_maxalloc =
          data.GetU16(&offset);               // Maximum extra paragraphs needed
      dos_header.e_ss = data.GetU16(&offset); // Initial (relative) SS value
      dos_header.e_sp = data.GetU16(&offset); // Initial SP value
      dos_header.e_csum = data.GetU16(&offset); // Checksum
      dos_header.e_ip = data.GetU16(&offset);   // Initial IP value
      dos_header.e_cs = data.GetU16(&offset);   // Initial (relative) CS value
      dos_header.e_lfarlc =
          data.GetU16(&offset); // File address of relocation table
      dos_header.e_ovno = data.GetU16(&offset); // Overlay number

      dos_header.e_res[0] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[1] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[2] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[3] = data.GetU16(&offset); // Reserved words

      dos_header.e_oemid =
          data.GetU16(&offset); // OEM identifier (for e_oeminfo)
      dos_header.e_oeminfo =
          data.GetU16(&offset); // OEM information; e_oemid specific
      dos_header.e_res2[0] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[1] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[2] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[3] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[4] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[5] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[6] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[7] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[8] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[9] = data.GetU16(&offset); // Reserved words

      dos_header.e_lfanew =
          data.GetU32(&offset); // File address of new exe header
    }
  }
  if (!success)
    memset(&dos_header, 0, sizeof(dos_header));
  return success;
}

//----------------------------------------------------------------------
// ParserCOFFHeader
//----------------------------------------------------------------------
bool ObjectFilePECOFF::ParseCOFFHeader(DataExtractor &data,
                                       lldb::offset_t *offset_ptr,
                                       coff_header_t &coff_header) {
  bool success =
      data.ValidOffsetForDataOfSize(*offset_ptr, sizeof(coff_header));
  if (success) {
    coff_header.machine = data.GetU16(offset_ptr);
    coff_header.nsects = data.GetU16(offset_ptr);
    coff_header.modtime = data.GetU32(offset_ptr);
    coff_header.symoff = data.GetU32(offset_ptr);
    coff_header.nsyms = data.GetU32(offset_ptr);
    coff_header.hdrsize = data.GetU16(offset_ptr);
    coff_header.flags = data.GetU16(offset_ptr);
  }
  if (!success)
    memset(&coff_header, 0, sizeof(coff_header));
  return success;
}

void
ThreadKDP::SetStopInfoFrom_KDP_EXCEPTION (const DataExtractor &exc_reply_packet)
{
    lldb::offset_t offset = 0;
    uint8_t reply_command = exc_reply_packet.GetU8(&offset);
    if (reply_command == CommunicationKDP::KDP_EXCEPTION)
    {
        offset = 8;
        const uint32_t count = exc_reply_packet.GetU32 (&offset);
        if (count >= 1)
        {
            //const uint32_t cpu = exc_reply_packet.GetU32 (&offset);
            offset += 4; // Skip the useless CPU field
            const uint32_t exc_type = exc_reply_packet.GetU32 (&offset);
            const uint32_t exc_code = exc_reply_packet.GetU32 (&offset);
            const uint32_t exc_subcode = exc_reply_packet.GetU32 (&offset);
            // We have to make a copy of the stop info because the thread list
            // will iterate through the threads and clear all stop infos..
            
            // Let the StopInfoMachException::CreateStopReasonWithMachException()
            // function update the PC if needed as we might hit a software breakpoint
            // and need to decrement the PC (i386 and x86_64 need this) and KDP
            // doesn't do this for us.
            const bool pc_already_adjusted = false;
            const bool adjust_pc_if_needed = true;

            m_cached_stop_info_sp = StopInfoMachException::CreateStopReasonWithMachException (*this,
                                                                                              exc_type,
                                                                                              2,
                                                                                              exc_code,
                                                                                              exc_subcode,
                                                                                              0,
                                                                                              pc_already_adjusted,
                                                                                              adjust_pc_if_needed);            
        }
    }
}

Error
AdbClient::ReadSyncHeader (std::string &response_id, uint32_t &data_len)
{
    char buffer[kSyncPacketLen];

    auto error = ReadAllBytes (buffer, kSyncPacketLen);
    if (error.Success ())
    {
        response_id.assign (&buffer[0], 4);
        DataExtractor extractor (&buffer[4], 4, eByteOrderLittle, sizeof (void*));
        offset_t offset = 0;
        data_len = extractor.GetU32 (&offset);
    }

    return error;
}

size_t
ObjectFilePECOFF::GetModuleSpecifications (const lldb_private::FileSpec& file,
                                           lldb::DataBufferSP& data_sp,
                                           lldb::offset_t data_offset,
                                           lldb::offset_t file_offset,
                                           lldb::offset_t length,
                                           lldb_private::ModuleSpecList &specs)
{
    const size_t initial_count = specs.GetSize();

    if (ObjectFilePECOFF::MagicBytesMatch(data_sp))
    {
        DataExtractor data;
        data.SetData(data_sp, data_offset, length);
        data.SetByteOrder(eByteOrderLittle);

        dos_header_t dos_header;
        coff_header_t coff_header;

        if (ParseDOSHeader(data, dos_header))
        {
            lldb::offset_t offset = dos_header.e_lfanew;
            uint32_t pe_signature = data.GetU32(&offset);
            if (pe_signature != IMAGE_NT_SIGNATURE)
                return false;
            if (ParseCOFFHeader(data, &offset, coff_header))
            {
                ArchSpec spec;
                if (coff_header.machine == MachineAmd64)
                {
                    spec.SetTriple("x86_64-pc-windows");
                    specs.Append(ModuleSpec(file, spec));
                }
                else if (coff_header.machine == MachineX86)
                {
                    spec.SetTriple("i386-pc-windows");
                    specs.Append(ModuleSpec(file, spec));
                    spec.SetTriple("i686-pc-windows");
                    specs.Append(ModuleSpec(file, spec));
                }
            }
        }
    }

    return specs.GetSize() - initial_count;
}

static bool
FileAtPathContainsArchAndUUID
(
    const FileSpec &file_spec,
    const ArchSpec *arch,
    const lldb_private::UUID *uuid
)
{
    DataExtractor data;
    off_t file_offset = 0;
    DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset, 0x1000));

    if (data_buffer_sp && data_buffer_sp->GetByteSize() > 0)
    {
        data.SetData(data_buffer_sp);

        uint32_t data_offset = 0;
        uint32_t magic = data.GetU32(&data_offset);

        switch (magic)
        {
        // 32 bit mach-o file
        case HeaderMagic32:
        case HeaderMagic32Swapped:
        case HeaderMagic64:
        case HeaderMagic64Swapped:
            return SkinnyMachOFileContainsArchAndUUID (file_spec, arch, uuid, file_offset, data, data_offset, magic);

        // fat mach-o file
        case UniversalMagic:
        case UniversalMagicSwapped:
            return UniversalMachOFileContainsArchAndUUID (file_spec, arch, uuid, file_offset, data, data_offset, magic);

        default:
            break;
        }
    }
    return false;
}

bool
RegisterContextMach_i386::WriteRegisterBytes (uint32_t reg, DataExtractor &data, uint32_t data_offset)
{
    int set = GetSetForNativeRegNum (reg);

    if (set == -1)
        return false;

    if (ReadRegisterSet(set, false) != KERN_SUCCESS)
        return false;


    const RegisterInfo * reg_info = GetRegisterInfoAtIndex (reg);
    if (reg_info == NULL && data.ValidOffsetForDataOfSize(data_offset, reg_info->byte_size))
        return false;

    uint32_t offset = data_offset;
    switch (reg)
    {
    case gpr_eax:
    case gpr_ebx:
    case gpr_ecx:
    case gpr_edx:
    case gpr_edi:
    case gpr_esi:
    case gpr_ebp:
    case gpr_esp:
    case gpr_ss:
    case gpr_eflags:
    case gpr_eip:
    case gpr_cs:
    case gpr_ds:
    case gpr_es:
    case gpr_fs:
    case gpr_gs:
        (&gpr.eax)[reg - gpr_eax] = data.GetU32 (&offset);
        break;

    case fpu_fcw:
        fpu.fcw = data.GetU16(&offset);
        break;

    case fpu_fsw:
        fpu.fsw = data.GetU16(&offset);
        break;

    case fpu_ftw:
        fpu.ftw = data.GetU8(&offset);
        break;

    case fpu_fop:
        fpu.fop = data.GetU16(&offset);
        break;

    case fpu_ip:
        fpu.ip = data.GetU32(&offset);
        break;

    case fpu_cs:
        fpu.cs = data.GetU16(&offset);
        break;

    case fpu_dp:
        fpu.dp = data.GetU32(&offset);
        break;

    case fpu_ds:
        fpu.ds = data.GetU16(&offset);
        break;

    case fpu_mxcsr:
        fpu.mxcsr = data.GetU32(&offset);
        break;

    case fpu_mxcsrmask:
        fpu.mxcsrmask = data.GetU32(&offset);
        break;

    case fpu_stmm0:
    case fpu_stmm1:
    case fpu_stmm2:
    case fpu_stmm3:
    case fpu_stmm4:
    case fpu_stmm5:
    case fpu_stmm6:
    case fpu_stmm7:
        ::memcpy (fpu.stmm[reg - fpu_stmm0].bytes, data.PeekData(offset, reg_info->byte_size), reg_info->byte_size);
        return false;

    case fpu_xmm0:
    case fpu_xmm1:
    case fpu_xmm2:
    case fpu_xmm3:
    case fpu_xmm4:
    case fpu_xmm5:
    case fpu_xmm6:
    case fpu_xmm7:
        // These values don't fit into scalar types, RegisterContext::ReadRegisterBytes()
        // must be used for these registers
        ::memcpy (fpu.xmm[reg - fpu_xmm0].bytes, data.PeekData(offset, reg_info->byte_size), reg_info->byte_size);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        sint = data.GetSLEB128(offset_ptr);
        s.Printf("%llu %lli", uint, sint);
        return 0;
    }
    if (opcode_class != DRC_ONEOPERAND)
    {
        s.Printf("UNKNOWN OP %u", opcode);
        return 1;
    }

    switch (opcode)
    {
        case DW_OP_addr:    size = address_size;    break;
        case DW_OP_const1u: size = 1;               break;
        case DW_OP_const1s: size = -1;              break;
        case DW_OP_const2u: size = 2;               break;
        case DW_OP_const2s: size = -2;              break;
        case DW_OP_const4u: size = 4;               break;
        case DW_OP_const4s: size = -4;              break;
        case DW_OP_const8u: size = 8;               break;
        case DW_OP_const8s: size = -8;              break;
        case DW_OP_constu:  size = 128;             break;
        case DW_OP_consts:  size = -128;            break;
        case DW_OP_fbreg:   size = -128;            break;
        case DW_OP_breg0:
        case DW_OP_breg1:
        case DW_OP_breg2:
        case DW_OP_breg3:
        case DW_OP_breg4:
        case DW_OP_breg5:
        case DW_OP_breg6:
        case DW_OP_breg7:
        case DW_OP_breg8:
        case DW_OP_breg9:
        case DW_OP_breg10:
        case DW_OP_breg11:
        case DW_OP_breg12:
        case DW_OP_breg13:
        case DW_OP_breg14:
        case DW_OP_breg15:
        case DW_OP_breg16:
        case DW_OP_breg17:
        case DW_OP_breg18:
        case DW_OP_breg19:
        case DW_OP_breg20:
        case DW_OP_breg21:
        case DW_OP_breg22:
        case DW_OP_breg23:
        case DW_OP_breg24:
        case DW_OP_breg25:
        case DW_OP_breg26:
        case DW_OP_breg27:
        case DW_OP_breg28:
        case DW_OP_breg29:
        case DW_OP_breg30:
        case DW_OP_breg31:
            size = -128; break;
        case DW_OP_pick:
            size = 1;       break;
        case DW_OP_deref_size:
            size = 1;       break;
        case DW_OP_xderef_size:
            size = 1;       break;
        case DW_OP_plus_uconst:
            size = 128;     break;
        case DW_OP_skip:
            size = -2;      break;
        case DW_OP_bra:
            size = -2;      break;
        case DW_OP_call2:
            size = 2;       break;
        case DW_OP_call4:
            size = 4;       break;
        case DW_OP_call_ref:
            size = dwarf_ref_size;  break;
        case DW_OP_piece:
            size = 128; break;
        case DW_OP_regx:
            size = 128; break;
        default:
            s.Printf("UNKNOWN ONE-OPERAND OPCODE, #%u", opcode);
            return 1;
    }

    switch (size)
    {
    case -1:    sint = (int8_t)     data.GetU8(offset_ptr);     s.Printf("%+lli", sint); break;
    case -2:    sint = (int16_t)    data.GetU16(offset_ptr);    s.Printf("%+lli", sint); break;
    case -4:    sint = (int32_t)    data.GetU32(offset_ptr);    s.Printf("%+lli", sint); break;
    case -8:    sint = (int64_t)    data.GetU64(offset_ptr);    s.Printf("%+lli", sint); break;
    case -128:  sint = data.GetSLEB128(offset_ptr);             s.Printf("%+lli", sint); break;
    case 1:     uint = data.GetU8(offset_ptr);                  s.Printf("0x%2.2llx", uint); break;
    case 2:     uint = data.GetU16(offset_ptr);                 s.Printf("0x%4.4llx", uint); break;
    case 4:     uint = data.GetU32(offset_ptr);                 s.Printf("0x%8.8llx", uint); break;
    case 8:     uint = data.GetU64(offset_ptr);                 s.Printf("0x%16.16llx", uint); break;
    case 128:   uint = data.GetULEB128(offset_ptr);             s.Printf("0x%llx", uint); break;
    }

    return 0;
}