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