kc3-lang/angle/src/libANGLE/serializer/JsonSerializer.cpp

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• Hash : a4ccd684
  Author :
  Date : 2021-05-17T10:28:38
  

  Capture/Replay: Write some bytes when serializing blobs
  
  Seeing a few bytes of the buffers might help to get an understanding
  of what goes wrong when blob check sums don't match.
  
  Bug: None
  Change-Id: I482af2b3d885afca39057d0841923449ec65d611
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2900218
  Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  

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• src/libANGLE/serializer/JsonSerializer.cpp

• //
  // Copyright 2021 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // JsonSerializer.cpp: Implementation of a JSON based serializer
  // Note that for binary blob data only a checksum is stored so that
  // a lossless  deserialization is not supported.
  
  #include "JsonSerializer.h"
  
  #include "common/debug.h"
  
  #include <anglebase/sha1.h>
  #include <rapidjson/document.h>
  #include <rapidjson/filewritestream.h>
  #include <rapidjson/ostreamwrapper.h>
  #include <rapidjson/prettywriter.h>
  
  namespace angle
  {
  
  namespace js = rapidjson;
  
  JsonSerializer::JsonSerializer() : mDoc(js::kObjectType), mAllocator(mDoc.GetAllocator()) {}
  
  JsonSerializer::~JsonSerializer() {}
  
  void JsonSerializer::startDocument(const std::string &name)
  {
      startGroup(name);
  }
  
  void JsonSerializer::startGroup(const std::string &name)
  {
      mGroupValueStack.push(SortedValueGroup());
      mGroupNameStack.push(name);
  }
  
  void JsonSerializer::endGroup()
  {
      SortedValueGroup group = std::move(mGroupValueStack.top());
      std::string name       = std::move(mGroupNameStack.top());
      mGroupValueStack.pop();
      mGroupNameStack.pop();
  
      mGroupValueStack.top().insert(std::make_pair(name, makeValueGroup(group)));
  }
  
  void JsonSerializer::addBlob(const std::string &name, const uint8_t *blob, size_t length)
  {
      unsigned char hash[angle::base::kSHA1Length];
      angle::base::SHA1HashBytes(blob, length, hash);
      std::ostringstream os;
  
      // Since we don't want to de-serialize the data we just store a checksume
      // of the blob
      os << "SHA1:";
      static constexpr char kASCII[] = "0123456789ABCDEF";
      for (size_t i = 0; i < angle::base::kSHA1Length; ++i)
      {
          os << kASCII[hash[i] & 0xf] << kASCII[hash[i] >> 4];
      }
  
      std::ostringstream hash_name;
      hash_name << name << "-hash";
      addString(hash_name.str(), os.str());
  
      std::vector<uint8_t> data(length < 16 ? length : (size_t)16);
      std::copy(blob, blob + data.size(), data.begin());
  
      std::ostringstream raw_name;
      raw_name << name << "-raw[0-" << data.size() - 1 << ']';
      addVector(raw_name.str(), data);
  }
  
  void JsonSerializer::addCString(const std::string &name, const char *value)
  {
      rapidjson::Value tag(name.c_str(), mAllocator);
      rapidjson::Value val(value, mAllocator);
      mGroupValueStack.top().insert(std::make_pair(name, std::move(val)));
  }
  
  void JsonSerializer::addString(const std::string &name, const std::string &value)
  {
      addCString(name, value.c_str());
  }
  
  void JsonSerializer::addVectorOfStrings(const std::string &name,
                                          const std::vector<std::string> &value)
  {
      rapidjson::Value array(rapidjson::kArrayType);
      array.SetArray();
  
      for (const std::string &v : value)
      {
          rapidjson::Value str(v.c_str(), mAllocator);
          array.PushBack(str, mAllocator);
      }
  
      mGroupValueStack.top().insert(std::make_pair(name, std::move(array)));
  }
  
  const char *JsonSerializer::data() const
  {
      return mResult.c_str();
  }
  
  std::vector<uint8_t> JsonSerializer::getData() const
  {
      return std::vector<uint8_t>(mResult.begin(), mResult.end());
  }
  
  void JsonSerializer::endDocument()
  {
      // finalize last group
      ASSERT(!mGroupValueStack.empty());
      ASSERT(!mGroupNameStack.empty());
  
      rapidjson::Value name_value(mGroupNameStack.top().c_str(), mAllocator);
      mDoc.AddMember(name_value, makeValueGroup(mGroupValueStack.top()), mAllocator);
  
      mGroupValueStack.pop();
      mGroupNameStack.pop();
      ASSERT(mGroupValueStack.empty());
      ASSERT(mGroupNameStack.empty());
  
      std::stringstream os;
      js::OStreamWrapper osw(os);
      js::PrettyWriter<js::OStreamWrapper> pretty_os(osw);
      mDoc.Accept(pretty_os);
      mResult = os.str();
  }
  
  size_t JsonSerializer::length() const
  {
      return mResult.length();
  }
  
  rapidjson::Value JsonSerializer::makeValueGroup(SortedValueGroup &group)
  {
      rapidjson::Value valueGroup(js::kObjectType);
      for (auto &it : group)
      {
          rapidjson::Value tag(it.first.c_str(), mAllocator);
          valueGroup.AddMember(tag, it.second, mAllocator);
      }
      return valueGroup;
  }
  
  }  // namespace angle
  

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