1    :  // Copyright 2011 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  //
  15    :  // Contains implementation details for the various templated functions declared
  16    :  // in dia_util.h. Not meant to be included directly.
  17    :  
  18    :  #ifndef SYZYGY_PE_DIA_UTIL_INTERNAL_H_
  19    :  #define SYZYGY_PE_DIA_UTIL_INTERNAL_H_
  20    :  
  21    :  #include "base/logging.h"
  22    :  #include "base/win/scoped_bstr.h"
  23    :  #include "base/win/scoped_comptr.h"
  24    :  #include "syzygy/common/com_utils.h"
  25    :  
  26    :  namespace pe {
  27    :  
  28    :  template <typename T>
  29  E :  SearchResult FindDiaTable(IDiaSession* dia_session, T** out_table) {
  30    :    return FindDiaTable(base::win::ScopedComPtr<T>::iid(),
  31    :                        dia_session,
  32  E :                        reinterpret_cast<void**>(out_table));
  33  E :  }
  34    :  
  35    :  template <typename T>
  36  E :  bool LoadDiaDebugStream(IDiaEnumDebugStreamData* stream, std::vector<T>* list) {
  37  E :    DCHECK(stream != NULL);
  38  E :    DCHECK(list != NULL);
  39    :  
  40  E :    LONG count = 0;
  41  E :    HRESULT hr = E_FAIL;
  42  E :    if (FAILED(hr = stream->get_Count(&count))) {
  43  i :      LOG(ERROR) << "Failed to get stream count: " << common::LogHr(hr) << ".";
  44  i :      return false;
  45    :    }
  46    :  
  47    :    // Get the length of the debug stream, and ensure it is the expected size.
  48  E :    DWORD bytes_read = 0;
  49  E :    ULONG count_read = 0;
  50  E :    hr = stream->Next(count, 0, &bytes_read, NULL, &count_read);
  51  E :    if (FAILED(hr)) {
  52  i :      LOG(ERROR) << "Unable to get debug stream length: "
  53    :                 << common::LogHr(hr) << ".";
  54  i :      return false;
  55    :    }
  56  E :    DCHECK_EQ(count * sizeof(T), bytes_read);
  57    :  
  58    :    // Actually read the stream.
  59  E :    list->resize(count);
  60  E :    bytes_read = 0;
  61  E :    count_read = 0;
  62    :    hr = stream->Next(count, count * sizeof(T), &bytes_read,
  63    :                      reinterpret_cast<BYTE*>(&list->at(0)),
  64  E :                      &count_read);
  65  E :    if (FAILED(hr)) {
  66  i :      LOG(ERROR) << "Unable to read debug stream: " << common::LogHr(hr) << ".";
  67  i :      return false;
  68    :    }
  69  E :    DCHECK_EQ(count * sizeof(T), bytes_read);
  70  E :    DCHECK_EQ(count, static_cast<LONG>(count_read));
  71    :  
  72  E :    return true;
  73  E :  }
  74    :  
  75    :  template <typename T>
  76    :  SearchResult FindAndLoadDiaDebugStreamByName(const wchar_t* name,
  77    :                                               IDiaSession* dia_session,
  78  E :                                               std::vector<T>* list) {
  79  E :    DCHECK(name != NULL);
  80  E :    DCHECK(dia_session != NULL);
  81  E :    DCHECK(list != NULL);
  82    :  
  83  E :    base::win::ScopedComPtr<IDiaEnumDebugStreamData> debug_stream;
  84    :    SearchResult search_result =
  85  E :        FindDiaDebugStream(name, dia_session, debug_stream.Receive());
  86  E :    if (search_result != kSearchSucceeded)
  87  E :      return search_result;
  88  E :    DCHECK(debug_stream.get() != NULL);
  89    :  
  90    :    return LoadDiaDebugStream(debug_stream.get(), list) ? kSearchSucceeded :
  91  E :        kSearchErrored;
  92  E :  }
  93    :  
  94    :  }  // namespace pe
  95    :  
  96    :  #endif  // SYZYGY_PE_DIA_UTIL_INTERNAL_H_