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🔨 using input/output adapters for CBOR and MessagePack

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- You can now pass a reference to a vector to the to_cbor and to_msgpack functions. The output will be written (appended) to the vector. #476

- You can now pass an output stream with uint8_t character type to the to_cbor and to_msgpack functions. #477

- You can now read from uint8_t */size in the to_cbor and to_msgpack functions. An input adapter will be created from this pair, so you need to use braces. #478
This commit is contained in:
Niels Lohmann 2017-07-23 23:02:24 +02:00
parent 9b1c058810
commit 4414f94cd5
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GPG key ID: 7F3CEA63AE251B69
4 changed files with 168 additions and 47 deletions
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90
src/json.hpp
View file

@ -1443,8 +1443,15 @@ class input_adapter
: ia(std::make_shared<cached_input_stream_adapter<16384>>(i)) {}
/// input adapter for buffer
input_adapter(const char* b, std::size_t l)
: ia(std::make_shared<input_buffer_adapter>(b, l)) {}
template <typename CharT,
typename std::enable_if<
std::is_pointer<CharT>::value and
std::is_integral<
typename std::remove_pointer<CharT>::type>::value and
sizeof(typename std::remove_pointer<CharT>::type) == 1,
int>::type = 0>
input_adapter(CharT b, std::size_t l)
: ia(std::make_shared<input_buffer_adapter>(reinterpret_cast<const char*>(b), l)) {}
// derived support
@ -4546,21 +4553,20 @@ class json_reverse_iterator : public std::reverse_iterator<Base>
/////////////////////
/// abstract output adapter interface
template <typename CharType> class output_adapter
template <typename CharType> struct output_adapter_protocol
{
public:
virtual void write_character(CharType c) = 0;
virtual void write_characters(const CharType* s, std::size_t length) = 0;
virtual ~output_adapter() = default;
virtual ~output_adapter_protocol() = default;
};
/// a type to simplify interfaces
template <typename CharType>
using output_adapter_t = std::shared_ptr<output_adapter<CharType>>;
using output_adapter_t = std::shared_ptr<output_adapter_protocol<CharType>>;
/// output adapter for byte vectors
template <typename CharType>
class output_vector_adapter : public output_adapter<CharType>
class output_vector_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_vector_adapter(std::vector<CharType>& vec) : v(vec) {}
@ -4581,7 +4587,7 @@ class output_vector_adapter : public output_adapter<CharType>
/// output adapter for output streams
template <typename CharType>
class output_stream_adapter : public output_adapter<CharType>
class output_stream_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_stream_adapter(std::basic_ostream<CharType>& s) : stream(s) {}
@ -4602,10 +4608,10 @@ class output_stream_adapter : public output_adapter<CharType>
/// output adapter for basic_string
template <typename CharType>
class output_string_adapter : public output_adapter<CharType>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_string_adapter(std::string& s) : str(s) {}
explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
void write_character(CharType c) override
{
@ -4621,23 +4627,26 @@ class output_string_adapter : public output_adapter<CharType>
std::basic_string<CharType>& str;
};
template <typename CharType> struct output_adapter_factory
template <typename CharType>
class output_adapter
{
static std::shared_ptr<output_adapter<CharType>>
create(std::vector<CharType>& vec)
public:
output_adapter(std::vector<CharType>& vec)
: oa(std::make_shared<output_vector_adapter<CharType>>(vec)) {}
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
output_adapter(std::basic_string<CharType>& s)
: oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
operator output_adapter_t<CharType>()
{
return std::make_shared<output_vector_adapter<CharType>>(vec);
return oa;
}
static std::shared_ptr<output_adapter<CharType>> create(std::ostream& s)
{
return std::make_shared<output_stream_adapter<CharType>>(s);
}
static std::shared_ptr<output_adapter<CharType>> create(std::string& s)
{
return std::make_shared<output_string_adapter<CharType>>(s);
}
private:
output_adapter_t<CharType> oa = nullptr;
};
//////////////////////////////
@ -9109,7 +9118,7 @@ class basic_json
const bool ensure_ascii = false) const
{
string_t result;
serializer s(detail::output_adapter_factory<char>::create(result), indent_char);
serializer s(detail::output_adapter<char>(result), indent_char);
if (indent >= 0)
{
@ -12783,7 +12792,7 @@ class basic_json
o.width(0);
// do the actual serialization
serializer s(detail::output_adapter_factory<char>::create(o), o.fill());
serializer s(detail::output_adapter<char>(o), o.fill());
s.dump(j, pretty_print, false, static_cast<unsigned int>(indentation));
return o;
}
@ -13162,11 +13171,15 @@ class basic_json
static std::vector<uint8_t> to_cbor(const basic_json& j)
{
std::vector<uint8_t> result;
binary_writer bw(detail::output_adapter_factory<uint8_t>::create(result));
bw.write_cbor(j);
to_cbor(j, result);
return result;
}
static void to_cbor(const basic_json& j, detail::output_adapter<uint8_t> o)
{
binary_writer(o).write_cbor(j);
}
/*!
@brief create a MessagePack serialization of a given JSON value
@ -13244,11 +13257,20 @@ class basic_json
static std::vector<uint8_t> to_msgpack(const basic_json& j)
{
std::vector<uint8_t> result;
binary_writer bw(detail::output_adapter_factory<uint8_t>::create(result));
bw.write_msgpack(j);
to_msgpack(j, result);
return result;
}
static void to_msgpack(const basic_json& j, detail::output_adapter<uint8_t> o)
{
binary_writer(o).write_msgpack(j);
}
static void to_msgpack(const basic_json& j, std::vector<uint8_t>& result)
{
binary_writer((detail::output_adapter<uint8_t>(result))).write_msgpack(j);
}
/*!
@brief create a JSON value from a byte vector in CBOR format
@ -13343,6 +13365,11 @@ class basic_json
return br.parse_cbor();
}
static basic_json from_cbor(detail::input_adapter i)
{
return binary_reader(i).parse_cbor();
}
/*!
@brief create a JSON value from a byte vector in MessagePack format
@ -13418,6 +13445,11 @@ class basic_json
return br.parse_msgpack();
}
static basic_json from_msgpack(detail::input_adapter i)
{
return binary_reader(i).parse_msgpack();
}
/// @}
//////////////////////////

44
test/src/unit-cbor.cpp
View file

@ -1519,6 +1519,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
std::ifstream f_json(filename);
json j1 = json::parse(f_json);
SECTION("std::vector<uint8_t>")
{
// parse CBOR file
std::ifstream f_cbor(filename + ".cbor", std::ios::binary);
std::vector<uint8_t> packed(
@ -1530,6 +1532,48 @@ TEST_CASE("CBOR roundtrips", "[hide]")
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("std::ifstream")
{
// parse CBOR file
std::ifstream f_cbor(filename + ".cbor", std::ios::binary);
json j2;
CHECK_NOTHROW(j2 = json::from_cbor(f_cbor));
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("uint8_t* and size")
{
// parse CBOR file
std::ifstream f_cbor(filename + ".cbor", std::ios::binary);
std::vector<uint8_t> packed(
(std::istreambuf_iterator<char>(f_cbor)),
std::istreambuf_iterator<char>());
json j2;
CHECK_NOTHROW(j2 = json::from_cbor({packed.data(), packed.size()}));
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("output to output adapters")
{
// parse CBOR file
std::ifstream f_cbor(filename + ".cbor", std::ios::binary);
std::vector<uint8_t> packed(
(std::istreambuf_iterator<char>(f_cbor)),
std::istreambuf_iterator<char>());
SECTION("std::vector<uint8_t>")
{
std::vector<uint8_t> vec;
json::to_cbor(j1, vec);
CHECK(vec == packed);
}
}
}
}
}

2
test/src/unit-convenience.cpp
View file

@ -36,7 +36,7 @@ void check_escaped(const char* original, const char* escaped, const bool ensure_
void check_escaped(const char* original, const char* escaped, const bool ensure_ascii)
{
std::stringstream ss;
json::serializer s(nlohmann::detail::output_adapter_factory<char>::create(ss), ' ');
json::serializer s(nlohmann::detail::output_adapter<char>(ss), ' ');
s.dump_escaped(original, ensure_ascii);
CHECK(ss.str() == escaped);
}

47
test/src/unit-msgpack.cpp
View file

@ -1292,9 +1292,12 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
std::ifstream f_json(filename);
json j1 = json::parse(f_json);
SECTION("std::vector<uint8_t>")
{
// parse MessagePack file
std::ifstream f_msgpack(filename + ".msgpack", std::ios::binary);
std::vector<uint8_t> packed((std::istreambuf_iterator<char>(f_msgpack)),
std::vector<uint8_t> packed(
(std::istreambuf_iterator<char>(f_msgpack)),
std::istreambuf_iterator<char>());
json j2;
CHECK_NOTHROW(j2 = json::from_msgpack(packed));
@ -1302,5 +1305,47 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("std::ifstream")
{
// parse MessagePack file
std::ifstream f_msgpack(filename + ".msgpack", std::ios::binary);
json j2;
CHECK_NOTHROW(j2 = json::from_msgpack(f_msgpack));
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("uint8_t* and size")
{
// parse MessagePack file
std::ifstream f_msgpack(filename + ".msgpack", std::ios::binary);
std::vector<uint8_t> packed(
(std::istreambuf_iterator<char>(f_msgpack)),
std::istreambuf_iterator<char>());
json j2;
CHECK_NOTHROW(j2 = json::from_msgpack({packed.data(), packed.size()}));
// compare parsed JSON values
CHECK(j1 == j2);
}
SECTION("output to output adapters")
{
// parse MessagePack file
std::ifstream f_msgpack(filename + ".msgpack", std::ios::binary);
std::vector<uint8_t> packed(
(std::istreambuf_iterator<char>(f_msgpack)),
std::istreambuf_iterator<char>());
SECTION("std::vector<uint8_t>")
{
std::vector<uint8_t> vec;
json::to_msgpack(j1, vec);
CHECK(vec == packed);
}
}
}
}
}