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Niels Lohmann 2017-04-03 22:58:46 +02:00
parent ea667db446
commit 782570d46f
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1 changed files with 89 additions and 594 deletions

683
src/json.hpp
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@ -8397,505 +8397,6 @@ class basic_json
} }
} }
/*!
@brief create a JSON value from a given CBOR vector
@param[in] v CBOR serialization
@param[in] idx byte index to start reading from @a v
@return deserialized JSON value
@throw parse_error.110 if the given vector ends prematurely
@throw parse_error.112 if unsupported features from CBOR were
used in the given vector @a v or if the input is not valid CBOR
@throw parse_error.113 if a string was expected as map key, but not found
@sa https://tools.ietf.org/html/rfc7049
*/
static basic_json from_cbor_internal(const std::vector<uint8_t>& v, size_t& idx)
{
// store and increment index
const size_t current_idx = idx++;
// make sure reading 1 byte is safe
check_length(v.size(), 1, current_idx);
switch (v[current_idx])
{
// Integer 0x00..0x17 (0..23)
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
case 0x09:
case 0x0a:
case 0x0b:
case 0x0c:
case 0x0d:
case 0x0e:
case 0x0f:
case 0x10:
case 0x11:
case 0x12:
case 0x13:
case 0x14:
case 0x15:
case 0x16:
case 0x17:
{
return v[current_idx];
}
case 0x18: // Unsigned integer (one-byte uint8_t follows)
{
idx += 1; // skip content byte
return get_from_vector<uint8_t>(v, current_idx);
}
case 0x19: // Unsigned integer (two-byte uint16_t follows)
{
idx += 2; // skip 2 content bytes
return get_from_vector<uint16_t>(v, current_idx);
}
case 0x1a: // Unsigned integer (four-byte uint32_t follows)
{
idx += 4; // skip 4 content bytes
return get_from_vector<uint32_t>(v, current_idx);
}
case 0x1b: // Unsigned integer (eight-byte uint64_t follows)
{
idx += 8; // skip 8 content bytes
return get_from_vector<uint64_t>(v, current_idx);
}
// Negative integer -1-0x00..-1-0x17 (-1..-24)
case 0x20:
case 0x21:
case 0x22:
case 0x23:
case 0x24:
case 0x25:
case 0x26:
case 0x27:
case 0x28:
case 0x29:
case 0x2a:
case 0x2b:
case 0x2c:
case 0x2d:
case 0x2e:
case 0x2f:
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
{
return static_cast<int8_t>(0x20 - 1 - v[current_idx]);
}
case 0x38: // Negative integer (one-byte uint8_t follows)
{
idx += 1; // skip content byte
// must be uint8_t !
return static_cast<number_integer_t>(-1) - get_from_vector<uint8_t>(v, current_idx);
}
case 0x39: // Negative integer -1-n (two-byte uint16_t follows)
{
idx += 2; // skip 2 content bytes
return static_cast<number_integer_t>(-1) - get_from_vector<uint16_t>(v, current_idx);
}
case 0x3a: // Negative integer -1-n (four-byte uint32_t follows)
{
idx += 4; // skip 4 content bytes
return static_cast<number_integer_t>(-1) - get_from_vector<uint32_t>(v, current_idx);
}
case 0x3b: // Negative integer -1-n (eight-byte uint64_t follows)
{
idx += 8; // skip 8 content bytes
return static_cast<number_integer_t>(-1) - static_cast<number_integer_t>(get_from_vector<uint64_t>(v, current_idx));
}
// 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:
{
const auto len = static_cast<size_t>(v[current_idx] - 0x60);
const size_t offset = current_idx + 1;
idx += len; // skip content bytes
check_length(v.size(), len, offset);
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
case 0x78: // UTF-8 string (one-byte uint8_t for n follows)
{
const auto len = static_cast<size_t>(get_from_vector<uint8_t>(v, current_idx));
const size_t offset = current_idx + 2;
idx += len + 1; // skip size byte + content bytes
check_length(v.size(), len, offset);
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
case 0x79: // UTF-8 string (two-byte uint16_t for n follow)
{
const auto len = static_cast<size_t>(get_from_vector<uint16_t>(v, current_idx));
const size_t offset = current_idx + 3;
idx += len + 2; // skip 2 size bytes + content bytes
check_length(v.size(), len, offset);
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
case 0x7a: // UTF-8 string (four-byte uint32_t for n follow)
{
const auto len = static_cast<size_t>(get_from_vector<uint32_t>(v, current_idx));
const size_t offset = current_idx + 5;
idx += len + 4; // skip 4 size bytes + content bytes
check_length(v.size(), len, offset);
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
case 0x7b: // UTF-8 string (eight-byte uint64_t for n follow)
{
const auto len = static_cast<size_t>(get_from_vector<uint64_t>(v, current_idx));
const size_t offset = current_idx + 9;
idx += len + 8; // skip 8 size bytes + content bytes
check_length(v.size(), len, offset);
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
case 0x7f: // UTF-8 string (indefinite length)
{
std::string result;
while (static_cast<void>(check_length(v.size(), 1, idx)), v[idx] != 0xff)
{
string_t s = from_cbor_internal(v, idx);
result += s;
}
// skip break byte (0xFF)
idx += 1;
return result;
}
// array (0x00..0x17 data items follow)
case 0x80:
case 0x81:
case 0x82:
case 0x83:
case 0x84:
case 0x85:
case 0x86:
case 0x87:
case 0x88:
case 0x89:
case 0x8a:
case 0x8b:
case 0x8c:
case 0x8d:
case 0x8e:
case 0x8f:
case 0x90:
case 0x91:
case 0x92:
case 0x93:
case 0x94:
case 0x95:
case 0x96:
case 0x97:
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(v[current_idx] - 0x80);
for (size_t i = 0; i < len; ++i)
{
result.push_back(from_cbor_internal(v, idx));
}
return result;
}
case 0x98: // array (one-byte uint8_t for n follows)
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(get_from_vector<uint8_t>(v, current_idx));
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
{
result.push_back(from_cbor_internal(v, idx));
}
return result;
}
case 0x99: // array (two-byte uint16_t for n follow)
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(get_from_vector<uint16_t>(v, current_idx));
idx += 2; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
{
result.push_back(from_cbor_internal(v, idx));
}
return result;
}
case 0x9a: // array (four-byte uint32_t for n follow)
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(get_from_vector<uint32_t>(v, current_idx));
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
{
result.push_back(from_cbor_internal(v, idx));
}
return result;
}
case 0x9b: // array (eight-byte uint64_t for n follow)
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(get_from_vector<uint64_t>(v, current_idx));
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
{
result.push_back(from_cbor_internal(v, idx));
}
return result;
}
case 0x9f: // array (indefinite length)
{
basic_json result = value_t::array;
while (static_cast<void>(check_length(v.size(), 1, idx)), v[idx] != 0xff)
{
result.push_back(from_cbor_internal(v, idx));
}
// skip break byte (0xFF)
idx += 1;
return result;
}
// map (0x00..0x17 pairs of data items follow)
case 0xa0:
case 0xa1:
case 0xa2:
case 0xa3:
case 0xa4:
case 0xa5:
case 0xa6:
case 0xa7:
case 0xa8:
case 0xa9:
case 0xaa:
case 0xab:
case 0xac:
case 0xad:
case 0xae:
case 0xaf:
case 0xb0:
case 0xb1:
case 0xb2:
case 0xb3:
case 0xb4:
case 0xb5:
case 0xb6:
case 0xb7:
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(v[current_idx] - 0xa0);
for (size_t i = 0; i < len; ++i)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb8: // map (one-byte uint8_t for n follows)
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(get_from_vector<uint8_t>(v, current_idx));
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb9: // map (two-byte uint16_t for n follow)
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(get_from_vector<uint16_t>(v, current_idx));
idx += 2; // skip 2 size bytes
for (size_t i = 0; i < len; ++i)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xba: // map (four-byte uint32_t for n follow)
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(get_from_vector<uint32_t>(v, current_idx));
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xbb: // map (eight-byte uint64_t for n follow)
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(get_from_vector<uint64_t>(v, current_idx));
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xbf: // map (indefinite length)
{
basic_json result = value_t::object;
while (static_cast<void>(check_length(v.size(), 1, idx)), v[idx] != 0xff)
{
cbor_expect_string(v, idx);
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
// skip break byte (0xFF)
idx += 1;
return result;
}
case 0xf4: // false
{
return false;
}
case 0xf5: // true
{
return true;
}
case 0xf6: // null
{
return value_t::null;
}
case 0xf9: // Half-Precision Float (two-byte IEEE 754)
{
idx += 2; // skip two content bytes
// code from RFC 7049, Appendix D, Figure 3:
// As half-precision floating-point numbers were only added to
// IEEE 754 in 2008, today's programming platforms often still
// only have limited support for them. It is very easy to
// include at least decoding support for them even without such
// support. An example of a small decoder for half-precision
// floating-point numbers in the C language is shown in Fig. 3.
check_length(v.size(), 2, current_idx + 1);
const int half = (v[current_idx + 1] << 8) + v[current_idx + 2];
const int exp = (half >> 10) & 0x1f;
const int mant = half & 0x3ff;
double val;
if (exp == 0)
{
val = std::ldexp(mant, -24);
}
else if (exp != 31)
{
val = std::ldexp(mant + 1024, exp - 25);
}
else
{
val = mant == 0
? std::numeric_limits<double>::infinity()
: std::numeric_limits<double>::quiet_NaN();
}
return (half & 0x8000) != 0 ? -val : val;
}
case 0xfa: // Single-Precision Float (four-byte IEEE 754)
{
// copy bytes in reverse order into the float variable
float res;
check_length(v.size(), sizeof(float), current_idx + 1);
for (size_t byte = 0; byte < sizeof(float); ++byte)
{
reinterpret_cast<uint8_t*>(&res)[sizeof(float) - byte - 1] = v[current_idx + 1 + byte];
}
idx += sizeof(float); // skip content bytes
return res;
}
case 0xfb: // Double-Precision Float (eight-byte IEEE 754)
{
// copy bytes in reverse order into the double variable
double res;
check_length(v.size(), sizeof(double), current_idx + 1);
for (size_t byte = 0; byte < sizeof(double); ++byte)
{
reinterpret_cast<uint8_t*>(&res)[sizeof(double) - byte - 1] = v[current_idx + 1 + byte];
}
idx += sizeof(double); // skip content bytes
return res;
}
default: // anything else (0xFF is handled inside the other types)
{
std::stringstream ss;
ss << std::hex << static_cast<int>(v[current_idx]);
JSON_THROW(parse_error::create(112, current_idx + 1, "error reading CBOR; last byte: 0x" + ss.str()));
}
}
}
public: public:
/*! /*!
@brief create a MessagePack serialization of a given JSON value @brief create a MessagePack serialization of a given JSON value
@ -9053,7 +8554,7 @@ class basic_json
} }
/*! /*!
@brief create a MessagePack serialization of a given JSON value @brief create a CBOR serialization of a given JSON value
Serializes a given JSON value @a j to a byte vector using the CBOR (Concise Serializes a given JSON value @a j to a byte vector using the CBOR (Concise
Binary Object Representation) serialization format. CBOR is a binary Binary Object Representation) serialization format. CBOR is a binary
@ -9141,100 +8642,6 @@ class basic_json
return result; return result;
} }
/*!
@brief create a JSON value from a byte vector in CBOR format
Deserializes a given byte vector @a v to a JSON value using the CBOR
(Concise Binary Object Representation) serialization format.
The library maps CBOR types to JSON value types as follows:
CBOR type | JSON value type | first byte
---------------------- | --------------- | ----------
Integer | number_unsigned | 0x00..0x17
Unsigned integer | number_unsigned | 0x18
Unsigned integer | number_unsigned | 0x19
Unsigned integer | number_unsigned | 0x1a
Unsigned integer | number_unsigned | 0x1b
Negative integer | number_integer | 0x20..0x37
Negative integer | number_integer | 0x38
Negative integer | number_integer | 0x39
Negative integer | number_integer | 0x3a
Negative integer | number_integer | 0x3b
Negative integer | number_integer | 0x40..0x57
UTF-8 string | string | 0x60..0x77
UTF-8 string | string | 0x78
UTF-8 string | string | 0x79
UTF-8 string | string | 0x7a
UTF-8 string | string | 0x7b
UTF-8 string | string | 0x7f
array | array | 0x80..0x97
array | array | 0x98
array | array | 0x99
array | array | 0x9a
array | array | 0x9b
array | array | 0x9f
map | object | 0xa0..0xb7
map | object | 0xb8
map | object | 0xb9
map | object | 0xba
map | object | 0xbb
map | object | 0xbf
False | `false` | 0xf4
True | `true` | 0xf5
Nill | `null` | 0xf6
Half-Precision Float | number_float | 0xf9
Single-Precision Float | number_float | 0xfa
Double-Precision Float | number_float | 0xfb
@warning The mapping is **incomplete** in the sense that not all CBOR
types can be converted to a JSON value. The following CBOR types
are not supported and will yield parse errors (parse_error.112):
- byte strings (0x40..0x5f)
- date/time (0xc0..0xc1)
- bignum (0xc2..0xc3)
- decimal fraction (0xc4)
- bigfloat (0xc5)
- tagged items (0xc6..0xd4, 0xd8..0xdb)
- expected conversions (0xd5..0xd7)
- simple values (0xe0..0xf3, 0xf8)
- undefined (0xf7)
@warning CBOR allows map keys of any type, whereas JSON only allows
strings as keys in object values. Therefore, CBOR maps with keys
other than UTF-8 strings are rejected (parse_error.113).
@note Any CBOR output created @ref to_cbor can be successfully parsed by
@ref from_cbor.
@param[in] v a byte vector in CBOR format
@param[in] start_index the index to start reading from @a v (0 by default)
@return deserialized JSON value
@throw parse_error.110 if the given vector ends prematurely
@throw parse_error.112 if unsupported features from CBOR were
used in the given vector @a v or if the input is not valid CBOR
@throw parse_error.113 if a string was expected as map key, but not found
@complexity Linear in the size of the byte vector @a v.
@liveexample{The example shows the deserialization of a byte vector in CBOR
format to a JSON value.,from_cbor}
@sa http://cbor.io
@sa @ref to_cbor(const basic_json&) for the analogous serialization
@sa @ref from_msgpack(const std::vector<uint8_t>&, const size_t) for the
related MessagePack format
@since version 2.0.9, parameter @a start_index since 2.1.1
*/
//static basic_json from_cbor(const std::vector<uint8_t>& v,
// const size_t start_index = 0)
//{
// size_t i = start_index;
// return from_cbor_internal(v, i);
//}
/// @} /// @}
/////////////////////////// ///////////////////////////
@ -10996,6 +10403,94 @@ class basic_json
}; };
public: public:
/*!
@brief create a JSON value from a byte vector in CBOR format
Deserializes a given byte vector @a v to a JSON value using the CBOR
(Concise Binary Object Representation) serialization format.
The library maps CBOR types to JSON value types as follows:
CBOR type | JSON value type | first byte
---------------------- | --------------- | ----------
Integer | number_unsigned | 0x00..0x17
Unsigned integer | number_unsigned | 0x18
Unsigned integer | number_unsigned | 0x19
Unsigned integer | number_unsigned | 0x1a
Unsigned integer | number_unsigned | 0x1b
Negative integer | number_integer | 0x20..0x37
Negative integer | number_integer | 0x38
Negative integer | number_integer | 0x39
Negative integer | number_integer | 0x3a
Negative integer | number_integer | 0x3b
Negative integer | number_integer | 0x40..0x57
UTF-8 string | string | 0x60..0x77
UTF-8 string | string | 0x78
UTF-8 string | string | 0x79
UTF-8 string | string | 0x7a
UTF-8 string | string | 0x7b
UTF-8 string | string | 0x7f
array | array | 0x80..0x97
array | array | 0x98
array | array | 0x99
array | array | 0x9a
array | array | 0x9b
array | array | 0x9f
map | object | 0xa0..0xb7
map | object | 0xb8
map | object | 0xb9
map | object | 0xba
map | object | 0xbb
map | object | 0xbf
False | `false` | 0xf4
True | `true` | 0xf5
Nill | `null` | 0xf6
Half-Precision Float | number_float | 0xf9
Single-Precision Float | number_float | 0xfa
Double-Precision Float | number_float | 0xfb
@warning The mapping is **incomplete** in the sense that not all CBOR
types can be converted to a JSON value. The following CBOR types
are not supported and will yield parse errors (parse_error.112):
- byte strings (0x40..0x5f)
- date/time (0xc0..0xc1)
- bignum (0xc2..0xc3)
- decimal fraction (0xc4)
- bigfloat (0xc5)
- tagged items (0xc6..0xd4, 0xd8..0xdb)
- expected conversions (0xd5..0xd7)
- simple values (0xe0..0xf3, 0xf8)
- undefined (0xf7)
@warning CBOR allows map keys of any type, whereas JSON only allows
strings as keys in object values. Therefore, CBOR maps with keys
other than UTF-8 strings are rejected (parse_error.113).
@note Any CBOR output created @ref to_cbor can be successfully parsed by
@ref from_cbor.
@param[in] v a byte vector in CBOR format
@param[in] start_index the index to start reading from @a v (0 by default)
@return deserialized JSON value
@throw parse_error.110 if the given vector ends prematurely
@throw parse_error.112 if unsupported features from CBOR were
used in the given vector @a v or if the input is not valid CBOR
@throw parse_error.113 if a string was expected as map key, but not found
@complexity Linear in the size of the byte vector @a v.
@liveexample{The example shows the deserialization of a byte vector in CBOR
format to a JSON value.,from_cbor}
@sa http://cbor.io
@sa @ref to_cbor(const basic_json&) for the analogous serialization
@sa @ref from_msgpack(const std::vector<uint8_t>&, const size_t) for the
related MessagePack format
@since version 2.0.9, parameter @a start_index since 2.1.1
*/
static basic_json from_cbor(const std::vector<uint8_t>& v, static basic_json from_cbor(const std::vector<uint8_t>& v,
const size_t start_index = 0) const size_t start_index = 0)
{ {