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#include "local_ads/campaign_serialization.hpp"
#include "coding/byte_stream.hpp"
#include "coding/reader.hpp"
#include "coding/varint.hpp"
#include "coding/write_to_sink.hpp"
#include "base/exception.hpp"
#include "base/logging.hpp"
#include "base/stl_add.hpp"
#include <climits>
#include <cstdint>
#include <type_traits>
#include <vector>
namespace
{
using namespace local_ads;
DECLARE_EXCEPTION(UnknownVersion, RootException);
auto const kHalfByteShift = CHAR_BIT / 2;
auto const kHalfByteMaxValue = 15;
auto const kLowerMask = 0x0F;
auto const kUpperMask = 0xF0;
auto const kMinZoomLevel = 10;
auto const kMaxZoomLevel = 17;
auto const kMaxPriority = 7;
template <typename Integral, typename Source,
std::enable_if_t<std::is_integral<Integral>::value, void *> = nullptr>
std::vector<Integral> ReadVarUintArray(Source & s, size_t chunksNumber)
{
std::vector<Integral> result;
for (size_t i = 0; i < chunksNumber; ++i)
result.emplace_back(static_cast<Integral>(ReadVarUint<uint64_t>(s)));
return result;
}
template <typename Integral, typename Source>
std::vector<Integral> ReadArray(Source & s, size_t chunksNumber)
{
std::vector<Integral> result;
for (size_t i = 0; i < chunksNumber; ++i)
{
result.emplace_back(ReadPrimitiveFromSource<Integral>(s));
}
return result;
}
std::vector<uint8_t> SerializeV1(std::vector<Campaign> const & campaigns)
{
std::vector<uint8_t> buff;
PushBackByteSink<decltype(buff)> dst(buff);
WriteToSink(dst, Version::V1);
WriteToSink(dst, campaigns.size());
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_featureId);
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_iconId);
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_daysBeforeExpired);
return buff;
}
std::vector<Campaign> DeserializeV1(std::vector<uint8_t> const & bytes)
{
ReaderSource<MemReaderWithExceptions> src({bytes.data(), bytes.size()});
CHECK_EQUAL(ReadPrimitiveFromSource<Version>(src), Version::V1, ());
auto const chunksNumber = ReadPrimitiveFromSource<uint64_t>(src);
auto const featureIds = ReadVarUintArray<uint32_t>(src, chunksNumber);
auto const icons = ReadVarUintArray<uint16_t>(src, chunksNumber);
auto const expirations = ReadVarUintArray<uint8_t>(src, chunksNumber);
std::vector<Campaign> campaigns;
campaigns.reserve(chunksNumber);
for (size_t i = 0; i < chunksNumber; ++i)
{
campaigns.emplace_back(featureIds[i], icons[i], expirations[i]);
}
return campaigns;
}
uint8_t ZoomIndex(uint8_t zoomValue) { return zoomValue - kMinZoomLevel; }
uint8_t ZoomValue(uint8_t zoomIndex) { return zoomIndex + kMinZoomLevel; }
uint8_t PackZoomAndPriority(uint8_t minZoomLevel, uint8_t priority)
{
ASSERT_GREATER_OR_EQUAL(minZoomLevel, kMinZoomLevel, ("Unsupported zoom level"));
ASSERT_LESS_OR_EQUAL(minZoomLevel, kMaxZoomLevel, ("Unsupported zoom level"));
ASSERT_LESS_OR_EQUAL(priority, kMaxPriority, ("Unsupported priority value"));
auto const zoomIndex = ZoomIndex(minZoomLevel);
ASSERT_LESS_OR_EQUAL(zoomIndex, kHalfByteMaxValue, ());
ASSERT_LESS_OR_EQUAL(priority, kHalfByteMaxValue, ());
// Pack zoom and priority into single byte.
return (zoomIndex & kLowerMask) | ((priority << kHalfByteShift) & kUpperMask);
}
uint8_t UnpackZoom(uint8_t src)
{
return ZoomValue(src & kLowerMask);
}
uint8_t UnpackPriority(uint8_t src)
{
return (src >> kHalfByteShift) & kLowerMask;
}
std::vector<uint8_t> SerializeV2(std::vector<Campaign> const & campaigns)
{
std::vector<uint8_t> buff;
PushBackByteSink<decltype(buff)> dst(buff);
WriteToSink(dst, Version::V2);
WriteToSink(dst, campaigns.size());
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_featureId);
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_iconId);
for (auto const & c : campaigns)
WriteVarUint(dst, c.m_daysBeforeExpired);
for (auto const & c : campaigns)
WriteToSink(dst, PackZoomAndPriority(c.m_minZoomLevel, c.m_priority));
return buff;
}
std::vector<Campaign> DeserializeV2(std::vector<uint8_t> const & bytes)
{
ReaderSource<MemReaderWithExceptions> src({bytes.data(), bytes.size()});
CHECK_EQUAL(ReadPrimitiveFromSource<Version>(src), Version::V2, ());
auto const chunksNumber = ReadPrimitiveFromSource<uint64_t>(src);
auto const featureIds = ReadVarUintArray<uint32_t>(src, chunksNumber);
auto const icons = ReadVarUintArray<uint16_t>(src, chunksNumber);
auto const expirations = ReadVarUintArray<uint8_t>(src, chunksNumber);
auto const zoomAndPriority = ReadArray<uint8_t>(src, chunksNumber);
std::vector<Campaign> campaigns;
campaigns.reserve(chunksNumber);
for (size_t i = 0; i < chunksNumber; ++i)
{
campaigns.emplace_back(featureIds[i], icons[i], expirations[i],
UnpackZoom(zoomAndPriority[i]),
UnpackPriority(zoomAndPriority[i]));
ASSERT_GREATER_OR_EQUAL(campaigns.back().m_minZoomLevel, kMinZoomLevel,
("Unsupported zoom level"));
ASSERT_LESS_OR_EQUAL(campaigns.back().m_minZoomLevel, kMaxZoomLevel,
("Unsupported zoom level"));
ASSERT_LESS_OR_EQUAL(campaigns.back().m_priority, kMaxPriority, ("Unsupported priority value"));
}
return campaigns;
}
} // namespace
namespace local_ads
{
std::vector<uint8_t> Serialize(std::vector<Campaign> const & campaigns, Version const version)
{
try
{
switch (version)
{
case Version::V1: return SerializeV1(campaigns);
case Version::V2: return SerializeV2(campaigns);
default: MYTHROW(UnknownVersion, (version));
}
}
catch (RootException const & e)
{
LOG(LERROR, ("Cannot to serialize campaigns", e.what(), e.Msg()));
}
return {};
}
std::vector<uint8_t> Serialize(std::vector<Campaign> const & campaigns)
{
return Serialize(campaigns, Version::Latest);
}
std::vector<Campaign> Deserialize(std::vector<uint8_t> const & bytes)
{
try
{
ReaderSource<MemReaderWithExceptions> src({bytes.data(), bytes.size()});
auto const version = ReadPrimitiveFromSource<Version>(src);
switch (version)
{
case Version::V1: return DeserializeV1(bytes);
case Version::V2: return DeserializeV2(bytes);
default: MYTHROW(UnknownVersion, (version));
}
}
catch (RootException const & e)
{
LOG(LERROR, ("Cannot to deserialize received data", e.what(), e.Msg()));
}
catch (std::bad_alloc const & e)
{
LOG(LERROR, ("Cannot to allocate memory for local ads campaigns", e.what()));
}
return {};
}
std::string DebugPrint(local_ads::Version version)
{
using local_ads::Version;
switch (version)
{
case Version::Unknown: return "Unknown";
case Version::V1: return "Version 1";
case Version::V2: return "Version 2";
default: ASSERT(false, ("Unknown version"));
}
return {};
}
} // namespace local_ads
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