1    :  // Copyright 2015 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    :  #include "syzygy/refinery/process_state/layer_data.h"
  16    :  
  17    :  namespace refinery {
  18    :  
  19    :  std::size_t PESignatureHasher::operator()(
  20  E :      pe::PEFile::Signature const& s) const {
  21    :    base::MD5Context ctx;
  22  E :    base::MD5Init(&ctx);
  23    :  
  24  E :    uint32_t base_address = s.base_address.value();
  25    :    base::MD5Update(
  26    :        &ctx, base::StringPiece(reinterpret_cast<const char*>(s.path.data()),
  27  E :                                s.path.size() * sizeof(wchar_t)));
  28    :    base::MD5Update(
  29    :        &ctx, base::StringPiece(reinterpret_cast<const char*>(&base_address),
  30  E :                                sizeof(base_address)));
  31    :    base::MD5Update(
  32    :        &ctx, base::StringPiece(reinterpret_cast<const char*>(&s.module_size),
  33  E :                                sizeof(s.module_size)));
  34    :    base::MD5Update(
  35    :        &ctx, base::StringPiece(reinterpret_cast<const char*>(&s.module_checksum),
  36  E :                                sizeof(s.module_checksum)));
  37    :    base::MD5Update(&ctx, base::StringPiece(reinterpret_cast<const char*>(
  38    :                                                &s.module_time_date_stamp),
  39  E :                                            sizeof(s.module_time_date_stamp)));
  40    :    base::MD5Digest digest;
  41  E :    base::MD5Final(&digest, &ctx);
  42    :  
  43    :    // Note: only using the first bytes of the digest.
  44  E :    return *reinterpret_cast<size_t*>(&digest);
  45  E :  }
  46    :  
  47  E :  ModuleLayerData::ModuleLayerData() {
  48  E :  }
  49    :  
  50  E :  ModuleId ModuleLayerData::Find(const pe::PEFile::Signature& signature) const {
  51  E :    auto it = signature_to_id_.find(signature);
  52  E :    if (it != signature_to_id_.end())
  53  E :      return it->second;
  54  E :    return kNoModuleId;
  55  E :  }
  56    :  
  57  E :  ModuleId ModuleLayerData::FindOrIndex(const pe::PEFile::Signature& signature) {
  58  E :    ModuleId id = Find(signature);
  59  E :    if (id != kNoModuleId)
  60  E :      return id;
  61    :  
  62  E :    id = signature_to_id_.size();
  63    :  
  64  E :    signature_to_id_[signature] = id;
  65  E :    signatures_.push_back(signature);
  66    :  
  67  E :    return id;
  68  E :  }
  69    :  
  70    :  bool ModuleLayerData::Find(ModuleId id,
  71  E :                             pe::PEFile::Signature* signature) const {
  72  E :    if (id >= signatures_.size())
  73  E :      return false;
  74    :  
  75  E :    *signature = signatures_[id];
  76  E :    return true;
  77  E :  }
  78    :  
  79    :  }  // namespace refinery