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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//
// 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