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Merge pull request #1320 from nlohmann/julian-becker-feature/bson

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Add BSON support
This commit is contained in:
Niels Lohmann 2018-10-27 16:37:54 +02:00 committed by GitHub
commit 037e93f5c0
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21 changed files with 3583 additions and 702 deletions
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9
Makefile
View file

@ -48,6 +48,7 @@ all:
@echo "cppcheck - analyze code with cppcheck"
@echo "doctest - compile example files and check their output"
@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
@echo "fuzz_testing_bson - prepare fuzz testing of the BSON parser"
@echo "fuzz_testing_cbor - prepare fuzz testing of the CBOR parser"
@echo "fuzz_testing_msgpack - prepare fuzz testing of the MessagePack parser"
@echo "fuzz_testing_ubjson - prepare fuzz testing of the UBJSON parser"
@ -220,6 +221,14 @@ fuzz_testing:
find test/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
fuzz_testing_bson:
rm -fr fuzz-testing
mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
$(MAKE) parse_bson_fuzzer -C test CXX=afl-clang++
mv test/parse_bson_fuzzer fuzz-testing/fuzzer
find test/data -size -5k -name *.bson | xargs -I{} cp "{}" fuzz-testing/testcases
@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
fuzz_testing_cbor:
rm -fr fuzz-testing
mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out

16
README.md
View file

@ -27,7 +27,7 @@
- [JSON Merge Patch](#json-merge-patch)
- [Implicit conversions](#implicit-conversions)
- [Conversions to/from arbitrary types](#arbitrary-types-conversions)
- [Binary formats (CBOR, MessagePack, and UBJSON)](#binary-formats-cbor-messagepack-and-ubjson)
- [Binary formats (CBOR, BSON, MessagePack, and UBJSON)](#binary-formats-bson-cbor-messagepack-and-ubjson)
- [Supported compilers](#supported-compilers)
- [License](#license)
- [Contact](#contact)
@ -874,14 +874,22 @@ struct bad_serializer
};
```
### Binary formats (CBOR, MessagePack, and UBJSON)
### Binary formats (CBOR, BSON, MessagePack, and UBJSON
Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance over a network. Hence, the library supports [CBOR](http://cbor.io) (Concise Binary Object Representation), [MessagePack](http://msgpack.org), and [UBJSON](http://ubjson.org) (Universal Binary JSON Specification) to efficiently encode JSON values to byte vectors and to decode such vectors.
Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance over a network. Hence, the library supports [BSON](http://bsonspec.org) (Binary JSON), [CBOR](http://cbor.io) (Concise Binary Object Representation), [MessagePack](http://msgpack.org), and [UBJSON](http://ubjson.org) (Universal Binary JSON Specification) to efficiently encode JSON values to byte vectors and to decode such vectors.
```cpp
// create a JSON value
json j = R"({"compact": true, "schema": 0})"_json;
// serialize to BSON
std::vector<std::uint8_t> v_bson = json::to_bson(j);
// 0x1B, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6F, 0x6D, 0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73, 0x63, 0x68, 0x65, 0x6D, 0x61, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
// roundtrip
json j_from_bson = json::from_bson(v_bson);
// serialize to CBOR
std::vector<std::uint8_t> v_cbor = json::to_cbor(j);
@ -1138,6 +1146,8 @@ I deeply appreciate the help of the following people.
- [Henry Schreiner](https://github.com/henryiii) added support for GCC 4.8.
- [knilch](https://github.com/knilch0r) made sure the test suite does not stall when run in the wrong directory.
- [Antonio Borondo](https://github.com/antonioborondo) fixed an MSVC 2017 warning.
- [efp](https://github.com/efp) added line and column information to parse errors.
- [julian-becker](https://github.com/julian-becker) added BSON support.
Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.

5
include/nlohmann/detail/exceptions.hpp
View file

@ -93,6 +93,7 @@ json.exception.parse_error.109 | parse error: array index 'one' is not a number
json.exception.parse_error.110 | parse error at 1: cannot read 2 bytes from vector | When parsing CBOR or MessagePack, the byte vector ends before the complete value has been read.
json.exception.parse_error.112 | parse error at 1: error reading CBOR; last byte: 0xF8 | Not all types of CBOR or MessagePack are supported. This exception occurs if an unsupported byte was read.
json.exception.parse_error.113 | parse error at 2: expected a CBOR string; last byte: 0x98 | While parsing a map key, a value that is not a string has been read.
json.exception.parse_error.114 | parse error: Unsupported BSON record type 0x0F | The parsing of the corresponding BSON record type is not implemented (yet).
@note For an input with n bytes, 1 is the index of the first character and n+1
is the index of the terminating null byte or the end of file. This also
@ -236,6 +237,7 @@ json.exception.type_error.313 | invalid value to unflatten | The @ref unflatten
json.exception.type_error.314 | only objects can be unflattened | The @ref unflatten function only works for an object whose keys are JSON Pointers.
json.exception.type_error.315 | values in object must be primitive | The @ref unflatten function only works for an object whose keys are JSON Pointers and whose values are primitive.
json.exception.type_error.316 | invalid UTF-8 byte at index 10: 0x7E | The @ref dump function only works with UTF-8 encoded strings; that is, if you assign a `std::string` to a JSON value, make sure it is UTF-8 encoded. |
json.exception.type_error.317 | JSON value cannot be serialized to requested format | The dynamic type of the object cannot be represented in the requested serialization format (e.g. a raw `true` or `null` JSON object cannot be serialized to BSON) |
@liveexample{The following code shows how a `type_error` exception can be
caught.,type_error}
@ -278,8 +280,9 @@ json.exception.out_of_range.403 | key 'foo' not found | The provided key was not
json.exception.out_of_range.404 | unresolved reference token 'foo' | A reference token in a JSON Pointer could not be resolved.
json.exception.out_of_range.405 | JSON pointer has no parent | The JSON Patch operations 'remove' and 'add' can not be applied to the root element of the JSON value.
json.exception.out_of_range.406 | number overflow parsing '10E1000' | A parsed number could not be stored as without changing it to NaN or INF.
json.exception.out_of_range.407 | number overflow serializing '9223372036854775808' | UBJSON only supports integers numbers up to 9223372036854775807. |
json.exception.out_of_range.407 | number overflow serializing '9223372036854775808' | UBJSON and BSON only support integer numbers up to 9223372036854775807. |
json.exception.out_of_range.408 | excessive array size: 8658170730974374167 | The size (following `#`) of an UBJSON array or object exceeds the maximal capacity. |
json.exception.out_of_range.409 | BSON key cannot contain code point U+0000 (at byte 2) | Key identifiers to be serialized to BSON cannot contain code point U+0000, since the key is stored as zero-terminated c-string |
@liveexample{The following code shows how an `out_of_range` exception can be
caught.,out_of_range}

822
include/nlohmann/detail/input/binary_reader.hpp
View file

@ -80,6 +80,10 @@ class binary_reader
result = parse_ubjson_internal();
break;
case input_format_t::bson:
result = parse_bson_internal();
break;
// LCOV_EXCL_START
default:
assert(false);
@ -121,6 +125,216 @@ class binary_reader
}
private:
//////////
// BSON //
//////////
/*!
@brief Reads in a BSON-object and passes it to the SAX-parser.
@return whether a valid BSON-value was passed to the SAX parser
*/
bool parse_bson_internal()
{
std::int32_t documentSize;
get_number<std::int32_t, true>(input_format_t::bson, documentSize);
if (JSON_UNLIKELY(not sax->start_object(std::size_t(-1))))
{
return false;
}
if (JSON_UNLIKELY(not parse_bson_element_list(/*is_array*/false)))
{
return false;
}
return sax->end_object();
}
/*!
@brief Parses a C-style string from the BSON input.
@param[in, out] result A reference to the string variable where the read
string is to be stored.
@return `true` if the \x00-byte indicating the end of the string was
encountered before the EOF; false` indicates an unexpected EOF.
*/
bool get_bson_cstr(string_t& result)
{
auto out = std::back_inserter(result);
while (true)
{
get();
if (JSON_UNLIKELY(not unexpect_eof(input_format_t::bson, "cstring")))
{
return false;
}
if (current == 0x00)
{
return true;
}
*out++ = static_cast<char>(current);
}
return true;
}
/*!
@brief Parses a zero-terminated string of length @a len from the BSON
input.
@param[in] len The length (including the zero-byte at the end) of the
string to be read.
@param[in, out] result A reference to the string variable where the read
string is to be stored.
@tparam NumberType The type of the length @a len
@pre len > 0
@return `true` if the string was successfully parsed
*/
template<typename NumberType>
bool get_bson_string(const NumberType len, string_t& result)
{
return get_string(input_format_t::bson, len - static_cast<NumberType>(1), result) and get() != std::char_traits<char>::eof();
}
/*!
@brief Read a BSON document element of the given @a element_type.
@param[in] element_type The BSON element type, c.f. http://bsonspec.org/spec.html
@param[in] element_type_parse_position The position in the input stream,
where the `element_type` was read.
@warning Not all BSON element types are supported yet. An unsupported
@a element_type will give rise to a parse_error.114:
Unsupported BSON record type 0x...
@return whether a valid BSON-object/array was passed to the SAX parser
*/
bool parse_bson_element_internal(const int element_type,
const std::size_t element_type_parse_position)
{
switch (element_type)
{
case 0x01: // double
{
double number;
return get_number<double, true>(input_format_t::bson, number) and sax->number_float(static_cast<number_float_t>(number), "");
}
case 0x02: // string
{
std::int32_t len;
string_t value;
return get_number<std::int32_t, true>(input_format_t::bson, len) and get_bson_string(len, value) and sax->string(value);
}
case 0x03: // object
{
return parse_bson_internal();
}
case 0x04: // array
{
return parse_bson_array();
}
case 0x08: // boolean
{
return sax->boolean(static_cast<bool>(get()));
}
case 0x0A: // null
{
return sax->null();
}
case 0x10: // int32
{
std::int32_t value;
return get_number<std::int32_t, true>(input_format_t::bson, value) and sax->number_integer(value);
}
case 0x12: // int64
{
std::int64_t value;
return get_number<std::int64_t, true>(input_format_t::bson, value) and sax->number_integer(value);
}
default: // anything else not supported (yet)
{
char cr[3];
snprintf(cr, sizeof(cr), "%.2hhX", static_cast<unsigned char>(element_type));
return sax->parse_error(element_type_parse_position, std::string(cr), parse_error::create(114, element_type_parse_position, "Unsupported BSON record type 0x" + std::string(cr)));
}
}
}
/*!
@brief Read a BSON element list (as specified in the BSON-spec)
The same binary layout is used for objects and arrays, hence it must be
indicated with the argument @a is_array which one is expected
(true --> array, false --> object).
@param[in] is_array Determines if the element list being read is to be
treated as an object (@a is_array == false), or as an
array (@a is_array == true).
@return whether a valid BSON-object/array was passed to the SAX parser
*/
bool parse_bson_element_list(const bool is_array)
{
string_t key;
while (int element_type = get())
{
if (JSON_UNLIKELY(not unexpect_eof(input_format_t::bson, "element list")))
{
return false;
}
const std::size_t element_type_parse_position = chars_read;
if (JSON_UNLIKELY(not get_bson_cstr(key)))
{
return false;
}
if (not is_array)
{
sax->key(key);
}
if (JSON_UNLIKELY(not parse_bson_element_internal(element_type, element_type_parse_position)))
{
return false;
}
// get_bson_cstr only appends
key.clear();
}
return true;
}
/*!
@brief Reads an array from the BSON input and passes it to the SAX-parser.
@return whether a valid BSON-array was passed to the SAX parser
*/
bool parse_bson_array()
{
std::int32_t documentSize;
get_number<std::int32_t, true>(input_format_t::bson, documentSize);
if (JSON_UNLIKELY(not sax->start_array(std::size_t(-1))))
{
return false;
}
if (JSON_UNLIKELY(not parse_bson_element_list(/*is_array*/true)))
{
return false;
}
return sax->end_array();
}
//////////
// CBOR //
//////////
/*!
@param[in] get_char whether a new character should be retrieved from the
input (true, default) or whether the last read
@ -459,6 +673,191 @@ class binary_reader
}
}
/*!
@brief reads a CBOR string
This function first reads starting bytes to determine the expected
string length and then copies this number of bytes into a string.
Additionally, CBOR's strings with indefinite lengths are supported.
@param[out] result created string
@return whether string creation completed
*/
bool get_cbor_string(string_t& result)
{
if (JSON_UNLIKELY(not unexpect_eof(input_format_t::cbor, "string")))
{
return false;
}
switch (current)
{
// UTF-8 string (0x00..0x17 bytes follow)
case 0x60:
case 0x61:
case 0x62:
case 0x63:
case 0x64:
case 0x65:
case 0x66:
case 0x67:
case 0x68:
case 0x69:
case 0x6A:
case 0x6B:
case 0x6C:
case 0x6D:
case 0x6E:
case 0x6F:
case 0x70:
case 0x71:
case 0x72:
case 0x73:
case 0x74:
case 0x75:
case 0x76:
case 0x77:
{
return get_string(input_format_t::cbor, current & 0x1F, result);
}
case 0x78: // UTF-8 string (one-byte uint8_t for n follows)
{
uint8_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x79: // UTF-8 string (two-byte uint16_t for n follow)
{
uint16_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7A: // UTF-8 string (four-byte uint32_t for n follow)
{
uint32_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7B: // UTF-8 string (eight-byte uint64_t for n follow)
{
uint64_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7F: // UTF-8 string (indefinite length)
{
while (get() != 0xFF)
{
string_t chunk;
if (not get_cbor_string(chunk))
{
return false;
}
result.append(chunk);
}
return true;
}
default:
{
auto last_token = get_token_string();
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, exception_message(input_format_t::cbor, "expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0x" + last_token, "string")));
}
}
}
/*!
@param[in] len the length of the array or std::size_t(-1) for an
array of indefinite size
@return whether array creation completed
*/
bool get_cbor_array(const std::size_t len)
{
if (JSON_UNLIKELY(not sax->start_array(len)))
{
return false;
}
if (len != std::size_t(-1))
{
for (std::size_t i = 0; i < len; ++i)
{
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
}
}
else
{
while (get() != 0xFF)
{
if (JSON_UNLIKELY(not parse_cbor_internal(false)))
{
return false;
}
}
}
return sax->end_array();
}
/*!
@param[in] len the length of the object or std::size_t(-1) for an
object of indefinite size
@return whether object creation completed
*/
bool get_cbor_object(const std::size_t len)
{
if (not JSON_UNLIKELY(sax->start_object(len)))
{
return false;
}
string_t key;
if (len != std::size_t(-1))
{
for (std::size_t i = 0; i < len; ++i)
{
get();
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
{
return false;
}
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
key.clear();
}
}
else
{
while (get() != 0xFF)
{
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
{
return false;
}
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
key.clear();
}
}
return sax->end_object();
}
/////////////
// MsgPack //
/////////////
/*!
@return whether a valid MessagePack value was passed to the SAX parser
*/
@ -821,300 +1220,6 @@ class binary_reader
}
}
/*!
@param[in] get_char whether a new character should be retrieved from the
input (true, default) or whether the last read
character should be considered instead
@return whether a valid UBJSON value was passed to the SAX parser
*/
bool parse_ubjson_internal(const bool get_char = true)
{
return get_ubjson_value(get_char ? get_ignore_noop() : current);
}
/*!
@brief get next character from the input
This function provides the interface to the used input adapter. It does
not throw in case the input reached EOF, but returns a -'ve valued
`std::char_traits<char>::eof()` in that case.
@return character read from the input
*/
int get()
{
++chars_read;
return (current = ia->get_character());
}
/*!
@return character read from the input after ignoring all 'N' entries
*/
int get_ignore_noop()
{
do
{
get();
}
while (current == 'N');
return current;
}
/*
@brief read a number from the input
@tparam NumberType the type of the number
@param[in] format the current format (for diagnostics)
@param[out] result number of type @a NumberType
@return whether conversion completed
@note This function needs to respect the system's endianess, because
bytes in CBOR, MessagePack, and UBJSON are stored in network order
(big endian) and therefore need reordering on little endian systems.
*/
template<typename NumberType>
bool get_number(const input_format_t format, NumberType& result)
{
// step 1: read input into array with system's byte order
std::array<uint8_t, sizeof(NumberType)> vec;
for (std::size_t i = 0; i < sizeof(NumberType); ++i)
{
get();
if (JSON_UNLIKELY(not unexpect_eof(format, "number")))
{
return false;
}
// reverse byte order prior to conversion if necessary
if (is_little_endian)
{
vec[sizeof(NumberType) - i - 1] = static_cast<uint8_t>(current);
}
else
{
vec[i] = static_cast<uint8_t>(current); // LCOV_EXCL_LINE
}
}
// step 2: convert array into number of type T and return
std::memcpy(&result, vec.data(), sizeof(NumberType));
return true;
}
/*!
@brief create a string by reading characters from the input
@tparam NumberType the type of the number
@param[in] format the current format (for diagnostics)
@param[in] len number of characters to read
@param[out] result string created by reading @a len bytes
@return whether string creation completed
@note We can not reserve @a len bytes for the result, because @a len
may be too large. Usually, @ref unexpect_eof() detects the end of
the input before we run out of string memory.
*/
template<typename NumberType>
bool get_string(const input_format_t format, const NumberType len, string_t& result)
{
bool success = true;
std::generate_n(std::back_inserter(result), len, [this, &success, &format]()
{
get();
if (JSON_UNLIKELY(not unexpect_eof(format, "string")))
{
success = false;
}
return static_cast<char>(current);
});
return success;
}
/*!
@brief reads a CBOR string
This function first reads starting bytes to determine the expected
string length and then copies this number of bytes into a string.
Additionally, CBOR's strings with indefinite lengths are supported.
@param[out] result created string
@return whether string creation completed
*/
bool get_cbor_string(string_t& result)
{
if (JSON_UNLIKELY(not unexpect_eof(input_format_t::cbor, "string")))
{
return false;
}
switch (current)
{
// UTF-8 string (0x00..0x17 bytes follow)
case 0x60:
case 0x61:
case 0x62:
case 0x63:
case 0x64:
case 0x65:
case 0x66:
case 0x67:
case 0x68:
case 0x69:
case 0x6A:
case 0x6B:
case 0x6C:
case 0x6D:
case 0x6E:
case 0x6F:
case 0x70:
case 0x71:
case 0x72:
case 0x73:
case 0x74:
case 0x75:
case 0x76:
case 0x77:
{
return get_string(input_format_t::cbor, current & 0x1F, result);
}
case 0x78: // UTF-8 string (one-byte uint8_t for n follows)
{
uint8_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x79: // UTF-8 string (two-byte uint16_t for n follow)
{
uint16_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7A: // UTF-8 string (four-byte uint32_t for n follow)
{
uint32_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7B: // UTF-8 string (eight-byte uint64_t for n follow)
{
uint64_t len;
return get_number(input_format_t::cbor, len) and get_string(input_format_t::cbor, len, result);
}
case 0x7F: // UTF-8 string (indefinite length)
{
while (get() != 0xFF)
{
string_t chunk;
if (not get_cbor_string(chunk))
{
return false;
}
result.append(chunk);
}
return true;
}
default:
{
auto last_token = get_token_string();
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, exception_message(input_format_t::cbor, "expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0x" + last_token, "string")));
}
}
}
/*!
@param[in] len the length of the array or std::size_t(-1) for an
array of indefinite size
@return whether array creation completed
*/
bool get_cbor_array(const std::size_t len)
{
if (JSON_UNLIKELY(not sax->start_array(len)))
{
return false;
}
if (len != std::size_t(-1))
{
for (std::size_t i = 0; i < len; ++i)
{
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
}
}
else
{
while (get() != 0xFF)
{
if (JSON_UNLIKELY(not parse_cbor_internal(false)))
{
return false;
}
}
}
return sax->end_array();
}
/*!
@param[in] len the length of the object or std::size_t(-1) for an
object of indefinite size
@return whether object creation completed
*/
bool get_cbor_object(const std::size_t len)
{
if (not JSON_UNLIKELY(sax->start_object(len)))
{
return false;
}
string_t key;
if (len != std::size_t(-1))
{
for (std::size_t i = 0; i < len; ++i)
{
get();
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
{
return false;
}
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
key.clear();
}
}
else
{
while (get() != 0xFF)
{
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
{
return false;
}
if (JSON_UNLIKELY(not parse_cbor_internal()))
{
return false;
}
key.clear();
}
}
return sax->end_object();
}
/*!
@brief reads a MessagePack string
@ -1249,6 +1354,22 @@ class binary_reader
return sax->end_object();
}
////////////
// UBJSON //
////////////
/*!
@param[in] get_char whether a new character should be retrieved from the
input (true, default) or whether the last read
character should be considered instead
@return whether a valid UBJSON value was passed to the SAX parser
*/
bool parse_ubjson_internal(const bool get_char = true)
{
return get_ubjson_value(get_char ? get_ignore_noop() : current);
}
/*!
@brief reads a UBJSON string
@ -1663,6 +1784,113 @@ class binary_reader
return sax->end_object();
}
///////////////////////
// Utility functions //
///////////////////////
/*!
@brief get next character from the input
This function provides the interface to the used input adapter. It does
not throw in case the input reached EOF, but returns a -'ve valued
`std::char_traits<char>::eof()` in that case.
@return character read from the input
*/
int get()
{
++chars_read;
return (current = ia->get_character());
}
/*!
@return character read from the input after ignoring all 'N' entries
*/
int get_ignore_noop()
{
do
{
get();
}
while (current == 'N');
return current;
}
/*
@brief read a number from the input
@tparam NumberType the type of the number
@param[in] format the current format (for diagnostics)
@param[out] result number of type @a NumberType
@return whether conversion completed
@note This function needs to respect the system's endianess, because
bytes in CBOR, MessagePack, and UBJSON are stored in network order
(big endian) and therefore need reordering on little endian systems.
*/
template<typename NumberType, bool InputIsLittleEndian = false>
bool get_number(const input_format_t format, NumberType& result)
{
// step 1: read input into array with system's byte order
std::array<uint8_t, sizeof(NumberType)> vec;
for (std::size_t i = 0; i < sizeof(NumberType); ++i)
{
get();
if (JSON_UNLIKELY(not unexpect_eof(format, "number")))
{
return false;
}
// reverse byte order prior to conversion if necessary
if (is_little_endian && !InputIsLittleEndian)
{
vec[sizeof(NumberType) - i - 1] = static_cast<uint8_t>(current);
}
else
{
vec[i] = static_cast<uint8_t>(current); // LCOV_EXCL_LINE
}
}
// step 2: convert array into number of type T and return
std::memcpy(&result, vec.data(), sizeof(NumberType));
return true;
}
/*!
@brief create a string by reading characters from the input
@tparam NumberType the type of the number
@param[in] format the current format (for diagnostics)
@param[in] len number of characters to read
@param[out] result string created by reading @a len bytes
@return whether string creation completed
@note We can not reserve @a len bytes for the result, because @a len
may be too large. Usually, @ref unexpect_eof() detects the end of
the input before we run out of string memory.
*/
template<typename NumberType>
bool get_string(const input_format_t format,
const NumberType len,
string_t& result)
{
bool success = true;
std::generate_n(std::back_inserter(result), len, [this, &success, &format]()
{
get();
if (JSON_UNLIKELY(not unexpect_eof(format, "string")))
{
success = false;
}
return static_cast<char>(current);
});
return success;
}
/*!
@param[in] format the current format (for diagnostics)
@param[in] context further context information (for diagnostics)
@ -1688,7 +1916,6 @@ class binary_reader
return std::string{cr};
}
private:
/*!
@param[in] format the current format
@param[in] detail a detailed error message
@ -1715,6 +1942,10 @@ class binary_reader
error_msg += "UBJSON";
break;
case input_format_t::bson:
error_msg += "BSON";
break;
// LCOV_EXCL_START
default:
assert(false);
@ -1724,6 +1955,7 @@ class binary_reader
return error_msg + " " + context + ": " + detail;
}
private:
/// input adapter
input_adapter_t ia = nullptr;

2
include/nlohmann/detail/input/input_adapters.hpp
View file

@ -18,7 +18,7 @@ namespace nlohmann
namespace detail
{
/// the supported input formats
enum class input_format_t { json, cbor, msgpack, ubjson };
enum class input_format_t { json, cbor, msgpack, ubjson, bson };
////////////////////
// input adapters //

12
include/nlohmann/detail/meta/type_traits.hpp
View file

@ -193,13 +193,13 @@ struct is_constructible_object_type_impl <
static constexpr bool value =
std::is_constructible<typename ConstructibleObjectType::key_type,
typename object_t::key_type>::value and
std::is_same<typename object_t::mapped_type,
typename ConstructibleObjectType::mapped_type>::value or
(has_from_json<BasicJsonType,
(std::is_same<typename object_t::mapped_type,
typename ConstructibleObjectType::mapped_type>::value or
has_non_default_from_json <
BasicJsonType,
typename ConstructibleObjectType::mapped_type >::value);
(has_from_json<BasicJsonType,
typename ConstructibleObjectType::mapped_type>::value or
has_non_default_from_json <
BasicJsonType,
typename ConstructibleObjectType::mapped_type >::value));
};
template <typename BasicJsonType, typename ConstructibleObjectType>

450
include/nlohmann/detail/output/binary_writer.hpp
View file

@ -35,7 +35,33 @@ class binary_writer
}
/*!
@brief[in] j JSON value to serialize
@param[in] j JSON value to serialize
@pre j.type() == value_t::object
*/
void write_bson(const BasicJsonType& j)
{
switch (j.type())
{
case value_t::object:
{
write_bson_object(*j.m_value.object);
break;
}
case value_t::discarded:
{
break;
}
default:
{
JSON_THROW(type_error::create(317, "to serialize to BSON, top-level type must be object, but is " + std::string(j.type_name())));
}
}
}
/*!
@param[in] j JSON value to serialize
*/
void write_cbor(const BasicJsonType& j)
{
@ -279,7 +305,7 @@ class binary_writer
}
/*!
@brief[in] j JSON value to serialize
@param[in] j JSON value to serialize
*/
void write_msgpack(const BasicJsonType& j)
{
@ -679,33 +705,362 @@ class binary_writer
}
private:
/*
@brief write a number to output input
//////////
// BSON //
//////////
@param[in] n number of type @a NumberType
@tparam NumberType the type of the number
@note This function needs to respect the system's endianess, because bytes
in CBOR, MessagePack, and UBJSON are stored in network order (big
endian) and therefore need reordering on little endian systems.
/*!
@return The size of a BSON document entry header, including the id marker
and the entry name size (and its null-terminator).
*/
template<typename NumberType>
void write_number(const NumberType n)
static std::size_t calc_bson_entry_header_size(const typename BasicJsonType::string_t& name)
{
// step 1: write number to array of length NumberType
std::array<CharType, sizeof(NumberType)> vec;
std::memcpy(vec.data(), &n, sizeof(NumberType));
// step 2: write array to output (with possible reordering)
if (is_little_endian)
const auto it = name.find(static_cast<typename BasicJsonType::string_t::value_type>(0));
if (JSON_UNLIKELY(it != BasicJsonType::string_t::npos))
{
// reverse byte order prior to conversion if necessary
std::reverse(vec.begin(), vec.end());
JSON_THROW(out_of_range::create(409,
"BSON key cannot contain code point U+0000 (at byte " + std::to_string(it) + ")"));
}
oa->write_characters(vec.data(), sizeof(NumberType));
return /*id*/ 1ul + name.size() + /*zero-terminator*/1u;
}
/*!
@brief Writes the given @a element_type and @a name to the output adapter
*/
void write_bson_entry_header(const typename BasicJsonType::string_t& name,
std::uint8_t element_type)
{
oa->write_character(static_cast<CharType>(element_type)); // boolean
oa->write_characters(
reinterpret_cast<const CharType*>(name.c_str()),
name.size() + 1u);
}
/*!
@brief Writes a BSON element with key @a name and boolean value @a value
*/
void write_bson_boolean(const typename BasicJsonType::string_t& name,
const bool value)
{
write_bson_entry_header(name, 0x08);
oa->write_character(value ? static_cast<CharType>(0x01) : static_cast<CharType>(0x00));
}
/*!
@brief Writes a BSON element with key @a name and double value @a value
*/
void write_bson_double(const typename BasicJsonType::string_t& name,
const double value)
{
write_bson_entry_header(name, 0x01);
write_number<double, true>(value);
}
/*!
@return The size of the BSON-encoded string in @a value
*/
static std::size_t calc_bson_string_size(const typename BasicJsonType::string_t& value)
{
return sizeof(std::int32_t) + value.size() + 1ul;
}
/*!
@brief Writes a BSON element with key @a name and string value @a value
*/
void write_bson_string(const typename BasicJsonType::string_t& name,
const typename BasicJsonType::string_t& value)
{
write_bson_entry_header(name, 0x02);
write_number<std::int32_t, true>(static_cast<std::int32_t>(value.size() + 1ul));
oa->write_characters(
reinterpret_cast<const CharType*>(value.c_str()),
value.size() + 1);
}
/*!
@brief Writes a BSON element with key @a name and null value
*/
void write_bson_null(const typename BasicJsonType::string_t& name)
{
write_bson_entry_header(name, 0x0A);
}
/*!
@return The size of the BSON-encoded integer @a value
*/
static std::size_t calc_bson_integer_size(const std::int64_t value)
{
if ((std::numeric_limits<std::int32_t>::min)() <= value and value <= (std::numeric_limits<std::int32_t>::max)())
{
return sizeof(std::int32_t);
}
else
{
return sizeof(std::int64_t);
}
}
/*!
@brief Writes a BSON element with key @a name and integer @a value
*/
void write_bson_integer(const typename BasicJsonType::string_t& name,
const std::int64_t value)
{
if ((std::numeric_limits<std::int32_t>::min)() <= value and value <= (std::numeric_limits<std::int32_t>::max)())
{
write_bson_entry_header(name, 0x10); // int32
write_number<std::int32_t, true>(static_cast<std::int32_t>(value));
}
else
{
write_bson_entry_header(name, 0x12); // int64
write_number<std::int64_t, true>(static_cast<std::int64_t>(value));
}
}
/*!
@return The size of the BSON-encoded unsigned integer in @a j
*/
static std::size_t calc_bson_unsigned_size(const std::uint64_t value)
{
if (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
{
return sizeof(std::int32_t);
}
else
{
return sizeof(std::int64_t);
}
}
/*!
@brief Writes a BSON element with key @a name and unsigned @a value
*/
void write_bson_unsigned(const typename BasicJsonType::string_t& name,
const std::uint64_t value)
{
if (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
{
write_bson_entry_header(name, 0x10); // int32
write_number<std::int32_t, true>(static_cast<std::int32_t>(value));
}
else if (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int64_t>::max)()))
{
write_bson_entry_header(name, 0x12); // int64
write_number<std::int64_t, true>(static_cast<std::int64_t>(value));
}
else
{
JSON_THROW(out_of_range::create(407, "number overflow serializing " + std::to_string(value)));
}
}
/*!
@brief Writes a BSON element with key @a name and object @a value
*/
void write_bson_object_entry(const typename BasicJsonType::string_t& name,
const typename BasicJsonType::object_t& value)
{
write_bson_entry_header(name, 0x03); // object
write_bson_object(value);
}
/*!
@return The size of the BSON-encoded array @a value
*/
static std::size_t calc_bson_array_size(const typename BasicJsonType::array_t& value)
{
std::size_t embedded_document_size = 0ul;
std::size_t array_index = 0ul;
for (const auto& el : value)
{
embedded_document_size += calc_bson_element_size(std::to_string(array_index++), el);
}
return sizeof(std::int32_t) + embedded_document_size + 1ul;
}
/*!
@brief Writes a BSON element with key @a name and array @a value
*/
void write_bson_array(const typename BasicJsonType::string_t& name,
const typename BasicJsonType::array_t& value)
{
write_bson_entry_header(name, 0x04); // array
write_number<std::int32_t, true>(static_cast<std::int32_t>(calc_bson_array_size(value)));
std::size_t array_index = 0ul;
for (const auto& el : value)
{
write_bson_element(std::to_string(array_index++), el);
}
oa->write_character(static_cast<CharType>(0x00));
}
/*!
@brief Calculates the size necessary to serialize the JSON value @a j with its @a name
@return The calculated size for the BSON document entry for @a j with the given @a name.
*/
static std::size_t calc_bson_element_size(const typename BasicJsonType::string_t& name,
const BasicJsonType& j)
{
const auto header_size = calc_bson_entry_header_size(name);
switch (j.type())
{
case value_t::discarded:
return 0ul;
case value_t::object:
return header_size + calc_bson_object_size(*j.m_value.object);
case value_t::array:
return header_size + calc_bson_array_size(*j.m_value.array);
case value_t::boolean:
return header_size + 1ul;
case value_t::number_float:
return header_size + 8ul;
case value_t::number_integer:
return header_size + calc_bson_integer_size(j.m_value.number_integer);
case value_t::number_unsigned:
return header_size + calc_bson_unsigned_size(j.m_value.number_unsigned);
case value_t::string:
return header_size + calc_bson_string_size(*j.m_value.string);
case value_t::null:
return header_size + 0ul;
// LCOV_EXCL_START
default:
assert(false);
return 0ul;
// LCOV_EXCL_STOP
};
}
/*!
@brief Serializes the JSON value @a j to BSON and associates it with the
key @a name.
@param name The name to associate with the JSON entity @a j within the
current BSON document
@return The size of the BSON entry
*/
void write_bson_element(const typename BasicJsonType::string_t& name,
const BasicJsonType& j)
{
switch (j.type())
{
case value_t::discarded:
return;
case value_t::object:
return write_bson_object_entry(name, *j.m_value.object);
case value_t::array:
return write_bson_array(name, *j.m_value.array);
case value_t::boolean:
return write_bson_boolean(name, j.m_value.boolean);
case value_t::number_float:
return write_bson_double(name, j.m_value.number_float);
case value_t::number_integer:
return write_bson_integer(name, j.m_value.number_integer);
case value_t::number_unsigned:
return write_bson_unsigned(name, j.m_value.number_unsigned);
case value_t::string:
return write_bson_string(name, *j.m_value.string);
case value_t::null:
return write_bson_null(name);
// LCOV_EXCL_START
default:
assert(false);
return;
// LCOV_EXCL_STOP
};
}
/*!
@brief Calculates the size of the BSON serialization of the given
JSON-object @a j.
@param[in] j JSON value to serialize
@pre j.type() == value_t::object
*/
static std::size_t calc_bson_object_size(const typename BasicJsonType::object_t& value)
{
std::size_t document_size = 0;
for (const auto& el : value)
{
document_size += calc_bson_element_size(el.first, el.second);
}
return sizeof(std::int32_t) + document_size + 1ul;
}
/*!
@param[in] j JSON value to serialize
@pre j.type() == value_t::object
*/
void write_bson_object(const typename BasicJsonType::object_t& value)
{
write_number<std::int32_t, true>(static_cast<std::int32_t>(calc_bson_object_size(value)));
for (const auto& el : value)
{
write_bson_element(el.first, el.second);
}
oa->write_character(static_cast<CharType>(0x00));
}
//////////
// CBOR //
//////////
static constexpr CharType get_cbor_float_prefix(float /*unused*/)
{
return static_cast<CharType>(0xFA); // Single-Precision Float
}
static constexpr CharType get_cbor_float_prefix(double /*unused*/)
{
return static_cast<CharType>(0xFB); // Double-Precision Float
}
/////////////
// MsgPack //
/////////////
static constexpr CharType get_msgpack_float_prefix(float /*unused*/)
{
return static_cast<CharType>(0xCA); // float 32
}
static constexpr CharType get_msgpack_float_prefix(double /*unused*/)
{
return static_cast<CharType>(0xCB); // float 64
}
////////////
// UBJSON //
////////////
// UBJSON: write number (floating point)
template<typename NumberType, typename std::enable_if<
std::is_floating_point<NumberType>::value, int>::type = 0>
@ -906,26 +1261,6 @@ class binary_writer
}
}
static constexpr CharType get_cbor_float_prefix(float /*unused*/)
{
return static_cast<CharType>(0xFA); // Single-Precision Float
}
static constexpr CharType get_cbor_float_prefix(double /*unused*/)
{
return static_cast<CharType>(0xFB); // Double-Precision Float
}
static constexpr CharType get_msgpack_float_prefix(float /*unused*/)
{
return static_cast<CharType>(0xCA); // float 32
}
static constexpr CharType get_msgpack_float_prefix(double /*unused*/)
{
return static_cast<CharType>(0xCB); // float 64
}
static constexpr CharType get_ubjson_float_prefix(float /*unused*/)
{
return 'd'; // float 32
@ -936,6 +1271,39 @@ class binary_writer
return 'D'; // float 64
}
///////////////////////
// Utility functions //
///////////////////////
/*
@brief write a number to output input
@param[in] n number of type @a NumberType
@tparam NumberType the type of the number
@tparam OutputIsLittleEndian Set to true if output data is
required to be little endian
@note This function needs to respect the system's endianess, because bytes
in CBOR, MessagePack, and UBJSON are stored in network order (big
endian) and therefore need reordering on little endian systems.
*/
template<typename NumberType, bool OutputIsLittleEndian = false>
void write_number(const NumberType n)
{
// step 1: write number to array of length NumberType
std::array<CharType, sizeof(NumberType)> vec;
std::memcpy(vec.data(), &n, sizeof(NumberType));
// step 2: write array to output (with possible reordering)
if (is_little_endian and not OutputIsLittleEndian)
{
// reverse byte order prior to conversion if necessary
std::reverse(vec.begin(), vec.end());
}
oa->write_characters(vec.data(), sizeof(NumberType));
}
private:
/// whether we can assume little endianess
const bool is_little_endian = binary_reader<BasicJsonType>::little_endianess();

3
include/nlohmann/detail/output/serializer.hpp
View file

@ -460,9 +460,10 @@ class serializer
// continue processing the string
state = UTF8_ACCEPT;
continue;
break;
}
}
break;
}
default: // decode found yet incomplete multi-byte code point

170
include/nlohmann/json.hpp
View file

@ -6627,6 +6627,87 @@ class basic_json
binary_writer<char>(o).write_ubjson(j, use_size, use_type);
}
/*!
@brief Serializes the given JSON object `j` to BSON and returns a vector
containing the corresponding BSON-representation.
BSON (Binary JSON) is a binary format in which zero or more ordered key/value pairs are
stored as a single entity (a so-called document).
The library uses the following mapping from JSON values types to BSON types:
JSON value type | value/range | BSON type | marker
--------------- | --------------------------------- | ----------- | ------
null | `null` | null | 0x0A
boolean | `true`, `false` | boolean | 0x08
number_integer | -9223372036854775808..-2147483649 | int64 | 0x12
number_integer | -2147483648..2147483647 | int32 | 0x10
number_integer | 2147483648..9223372036854775807 | int64 | 0x12
number_unsigned | 0..2147483647 | int32 | 0x10
number_unsigned | 2147483648..9223372036854775807 | int64 | 0x12
number_unsigned | 9223372036854775808..18446744073709551615| -- | --
number_float | *any value* | double | 0x01
string | *any value* | string | 0x02
array | *any value* | document | 0x04
object | *any value* | document | 0x03
@warning The mapping is **incomplete**, since only JSON-objects (and things
contained therein) can be serialized to BSON.
Also, integers larger than 9223372036854775807 cannot be serialized to BSON,
and the keys may not contain U+0000, since they are serialized a
zero-terminated c-strings.
@throw out_of_range.407 if `j.is_number_unsigned() && j.get<std::uint64_t>() > 9223372036854775807`
@throw out_of_range.409 if a key in `j` contains a NULL (U+0000)
@throw type_error.317 if `!j.is_object()`
@pre The input `j` is required to be an object: `j.is_object() == true`.
@note Any BSON output created via @ref to_bson can be successfully parsed
by @ref from_bson.
@param[in] j JSON value to serialize
@return BSON serialization as byte vector
@complexity Linear in the size of the JSON value @a j.
@sa http://bsonspec.org/spec.html
@sa @ref from_bson(detail::input_adapter, const bool strict) for the
analogous deserialization
@sa @ref to_ubjson(const basic_json&) for the related UBJSON format
@sa @ref to_cbor(const basic_json&) for the related CBOR format
@sa @ref to_msgpack(const basic_json&) for the related MessagePack format
*/
static std::vector<uint8_t> to_bson(const basic_json& j)
{
std::vector<uint8_t> result;
to_bson(j, result);
return result;
}
/*!
@brief Serializes the given JSON object `j` to BSON and forwards the
corresponding BSON-representation to the given output_adapter `o`.
@param j The JSON object to convert to BSON.
@param o The output adapter that receives the binary BSON representation.
@pre The input `j` shall be an object: `j.is_object() == true`
@sa @ref to_bson(const basic_json&)
*/
static void to_bson(const basic_json& j, detail::output_adapter<uint8_t> o)
{
binary_writer<uint8_t>(o).write_bson(j);
}
/*!
@copydoc to_bson(const basic_json&, detail::output_adapter<uint8_t>)
*/
static void to_bson(const basic_json& j, detail::output_adapter<char> o)
{
binary_writer<char>(o).write_bson(j);
}
/*!
@brief create a JSON value from an input in CBOR format
@ -6821,6 +6902,8 @@ class basic_json
related CBOR format
@sa @ref from_ubjson(detail::input_adapter&&, const bool, const bool) for
the related UBJSON format
@sa @ref from_bson(detail::input_adapter, const bool, const bool) for
the related BSON format
@since version 2.0.9; parameter @a start_index since 2.1.1; changed to
consume input adapters, removed start_index parameter, and added
@ -6906,6 +6989,8 @@ class basic_json
related CBOR format
@sa @ref from_msgpack(detail::input_adapter&&, const bool, const bool) for
the related MessagePack format
@sa @ref from_bson(detail::input_adapter, const bool, const bool) for
the related BSON format
@since version 3.1.0; added @a allow_exceptions parameter since 3.2.0
*/
@ -6934,6 +7019,91 @@ class basic_json
return res ? result : basic_json(value_t::discarded);
}
/*!
@brief Create a JSON value from an input in BSON format
Deserializes a given input @a i to a JSON value using the BSON (Binary JSON)
serialization format.
The library maps BSON record types to JSON value types as follows:
BSON type | BSON marker byte | JSON value type
--------------- | ---------------- | ---------------------------
double | 0x01 | number_float
string | 0x02 | string
document | 0x03 | object
array | 0x04 | array
binary | 0x05 | still unsupported
undefined | 0x06 | still unsupported
ObjectId | 0x07 | still unsupported
boolean | 0x08 | boolean
UTC Date-Time | 0x09 | still unsupported
null | 0x0A | null
Regular Expr. | 0x0B | still unsupported
DB Pointer | 0x0C | still unsupported
JavaScript Code | 0x0D | still unsupported
Symbol | 0x0E | still unsupported
JavaScript Code | 0x0F | still unsupported
int32 | 0x10 | number_integer
Timestamp | 0x11 | still unsupported
128-bit decimal float | 0x13 | still unsupported
Max Key | 0x7F | still unsupported
Min Key | 0xFF | still unsupported
@warning The mapping is **incomplete**. The unsupported mappings
are indicated in the table above.
@param[in] i an input in BSON format convertible to an input adapter
@param[in] strict whether to expect the input to be consumed until EOF
(true by default)
@param[in] allow_exceptions whether to throw exceptions in case of a
parse error (optional, true by default)
@return deserialized JSON value
@throw parse_error.114 if an unsupported BSON record type is encountered
@sa http://bsonspec.org/spec.html
@sa @ref to_bson(const basic_json&, const bool, const bool) for the
analogous serialization
@sa @ref from_cbor(detail::input_adapter, const bool, const bool) for the
related CBOR format
@sa @ref from_msgpack(detail::input_adapter, const bool, const bool) for
the related MessagePack format
@sa @ref from_ubjson(detail::input_adapter, const bool, const bool) for the
related UBJSON format
*/
static basic_json from_bson(detail::input_adapter&& i,
const bool strict = true,
const bool allow_exceptions = true)
{
basic_json result;
detail::json_sax_dom_parser<basic_json> sdp(result, allow_exceptions);
const bool res = binary_reader(detail::input_adapter(i)).sax_parse(input_format_t::bson, &sdp, strict);
return res ? result : basic_json(value_t::discarded);
}
/*!
@copydoc from_bson(detail::input_adapter&&, const bool, const bool)
*/
template<typename A1, typename A2,
detail::enable_if_t<std::is_constructible<detail::input_adapter, A1, A2>::value, int> = 0>
static basic_json from_bson(A1 && a1, A2 && a2,
const bool strict = true,
const bool allow_exceptions = true)
{
basic_json result;
detail::json_sax_dom_parser<basic_json> sdp(result, allow_exceptions);
const bool res = binary_reader(detail::input_adapter(std::forward<A1>(a1), std::forward<A2>(a2))).sax_parse(input_format_t::bson, &sdp, strict);
return res ? result : basic_json(value_t::discarded);
}
/// @}
//////////////////////////

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test/Makefile
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@ -10,6 +10,7 @@ SOURCES = src/unit.cpp \
src/unit-algorithms.cpp \
src/unit-allocator.cpp \
src/unit-alt-string.cpp \
src/unit-bson.cpp \
src/unit-capacity.cpp \
src/unit-cbor.cpp \
src/unit-class_const_iterator.cpp \
@ -90,12 +91,15 @@ check: $(OBJECTS) $(TESTCASES)
##############################################################################
FUZZER_ENGINE = src/fuzzer-driver_afl.cpp
FUZZERS = parse_afl_fuzzer parse_cbor_fuzzer parse_msgpack_fuzzer parse_ubjson_fuzzer
FUZZERS = parse_afl_fuzzer parse_bson_fuzzer parse_cbor_fuzzer parse_msgpack_fuzzer parse_ubjson_fuzzer
fuzzers: $(FUZZERS)
parse_afl_fuzzer:
$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_json.cpp -o $@
parse_bson_fuzzer:
$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_bson.cpp -o $@
parse_cbor_fuzzer:
$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_cbor.cpp -o $@

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test/src/fuzzer-parse_bson.cpp Normal file
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@ -0,0 +1,73 @@
/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (fuzz test support)
| | |__ | | | | | | version 3.3.0
|_____|_____|_____|_|___| https://github.com/nlohmann/json
This file implements a parser test suitable for fuzz testing. Given a byte
array data, it performs the following steps:
- j1 = from_bson(data)
- vec = to_bson(j1)
- j2 = from_bson(vec)
- assert(j1 == j2)
The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
drivers.
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
*/
#include <iostream>
#include <sstream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
// see http://llvm.org/docs/LibFuzzer.html
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
try
{
// step 1: parse input
std::vector<uint8_t> vec1(data, data + size);
json j1 = json::from_bson(vec1);
if (j1.is_discarded())
{
return 0;
}
try
{
// step 2: round trip
std::vector<uint8_t> vec2 = json::to_bson(j1);
// parse serialization
json j2 = json::from_bson(vec2);
// serializations must match
assert(json::to_bson(j2) == vec2);
}
catch (const json::parse_error&)
{
// parsing a BSON serialization must not fail
assert(false);
}
}
catch (const json::parse_error&)
{
// parse errors are ok, because input may be random bytes
}
catch (const json::type_error&)
{
// type errors can occur during parsing, too
}
catch (const json::out_of_range&)
{
// out of range errors can occur during parsing, too
}
// return 0 - non-zero return values are reserved for future use
return 0;
}

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test/src/fuzzer-parse_json.cpp
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@ -60,10 +60,6 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
// parse errors are ok, because input may be random bytes
}
catch (const json::out_of_range&)
{
// parse errors are ok, because input may be random bytes
}
catch (const json::out_of_range&)
{
// out of range errors may happen if provided sizes are excessive
}

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test/src/unit-regression.cpp
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@ -139,10 +139,10 @@ bool operator==(Data const& lhs, Data const& rhs)
return lhs.a == rhs.a && lhs.b == rhs.b;
}
bool operator!=(Data const& lhs, Data const& rhs)
{
return !(lhs == rhs);
}
//bool operator!=(Data const& lhs, Data const& rhs)
//{
// return !(lhs == rhs);
//}
}
/////////////////////////////////////////////////////////////////////