Skip to content

J
json
Commit f1b95d78 authored by Niels Lohmann's avatar Niels Lohmann
Browse files
Options

🔨 refactored CBOR code to a switch

parent d99c230f
Hide whitespace changes
Inline Side-by-side
Showing with 928 additions and 574 deletions
src/json.hpp
View file @ f1b95d78
......@@ -6262,13 +6262,28 @@ class basic_json
}
}
/*
/*!
@brief take sufficient bytes from a vector to fill an integer variable
In the context of binary serialization formats, we need to read several
bytes from a byte vector and combine them to multi-byte integral data
types.
@param[in] vec byte vector to read from
@param[in] current_index the psition in the vector after which to read
@return the next sizeof(T) bytes from @a vec, in reverse order as T
@tparam T the integral return type
@throw std::out_of_range if there are less than sizeof(T)+1 bytes in the
vector @a vec to read
Precondition:
vec: | | | a | b | c | d | | | T: | | | | |
^ ^ ^ ^
current_index idx ptr sizeof(T)
current_index idx ptr sizeof(T)
Postcondition:
......@@ -6277,12 +6292,16 @@ class basic_json
| idx ptr
current_index
Code from <http://stackoverflow.com/a/41031865/266378>
@sa Code from <http://stackoverflow.com/a/41031865/266378>.
*/
template<typename T>
static T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_index)
{
if (current_index + sizeof(T) + 1 > vec.size())
{
throw std::out_of_range("cannot read " + std::to_string(sizeof(T)) + " bytes from vector");
}
T result;
uint8_t* ptr = reinterpret_cast<uint8_t*>(&result);
size_t idx = current_index + 1 + sizeof(T);
......@@ -6959,327 +6978,485 @@ class basic_json
// store and increment index
const size_t current_idx = idx++;
if (v[current_idx] <= 0x17) // Integer 0x00..0x17
{
return v[current_idx];
}
else if (v[current_idx] == 0x18) // Unsigned integer uint8_t
{
idx += 1; // skip content byte
return get_from_vector<uint8_t>(v, current_idx);
}
else if (v[current_idx] == 0x19) // Unsigned integer uint16_t
{
idx += 2; // skip 2 content bytes
return get_from_vector<uint16_t>(v, current_idx);
}
else if (v[current_idx] == 0x1a) // Unsigned integer uint32_t
{
idx += 4; // skip 4 content bytes
return get_from_vector<uint32_t>(v, current_idx);
}
else if (v[current_idx] == 0x1b) // Unsigned integer uint64_t
{
idx += 8; // skip 8 content bytes
return get_from_vector<uint64_t>(v, current_idx);
}
else if (v[current_idx] >= 0x20 and v[current_idx] <= 0x37) // Negative integer
{
return static_cast<int8_t>(0x20 - 1 - v[current_idx]);
}
else if (v[current_idx] == 0x38) // Negative integer
{
idx += 1; // skip content byte
// must be uint8_t !
return -1 - get_from_vector<uint8_t>(v, current_idx);
}
else if (v[current_idx] == 0x39) // Negative integer
{
idx += 2; // skip 2 content bytes
return -1 - get_from_vector<int16_t>(v, current_idx);
}
else if (v[current_idx] == 0x3a) // Negative integer
{
idx += 4; // skip 4 content bytes
return -1 - get_from_vector<int32_t>(v, current_idx);
}
else if (v[current_idx] == 0x3b) // Negative integer
{
idx += 8; // skip 8 content bytes
return -1 - get_from_vector<int64_t>(v, current_idx);
}
else if (v[current_idx] >= 0x60 and v[current_idx] <= 0x77) // UTF-8 string
{
const size_t len = v[current_idx] - 0x60;
const size_t offset = current_idx + 1;
idx += len; // skip content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x78) // UTF-8 string
{
const auto len = get_from_vector<uint8_t>(v, current_idx);
const size_t offset = current_idx + 2;
idx += len + 1; // skip size byte + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x79) // UTF-8 string
{
const auto len = get_from_vector<uint16_t>(v, current_idx);
const size_t offset = current_idx + 3;
idx += len + 2; // skip 2 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7a) // UTF-8 string
{
const auto len = get_from_vector<uint32_t>(v, current_idx);
const size_t offset = current_idx + 5;
idx += len + 4; // skip 4 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7b) // UTF-8 string
{
const auto len = get_from_vector<uint64_t>(v, current_idx);
const size_t offset = current_idx + 9;
idx += len + 8; // skip 8 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7f) // UTF-8 string (indefinite length)
switch (v[current_idx])
{
std::string result;
while (v[idx] != 0xff)
// integer
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:
{
string_t s = from_cbor_internal(v, idx);
result += s;
return v[current_idx];
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] >= 0x80 and v[current_idx] <= 0x97) // array
{
basic_json result = value_t::array;
const size_t len = v[current_idx] - 0x80;
for (size_t i = 0; i < len; ++i)
case 0x18: // Unsigned integer uint8_t
{
idx += 1; // skip content byte
return get_from_vector<uint8_t>(v, current_idx);
}
case 0x19: // Unsigned integer uint16_t
{
idx += 2; // skip 2 content bytes
return get_from_vector<uint16_t>(v, current_idx);
}
case 0x1a: // Unsigned integer uint32_t
{
result.push_back(from_cbor_internal(v, idx));
idx += 4; // skip 4 content bytes
return get_from_vector<uint32_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x98) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
case 0x1b: // Unsigned integer uint64_t
{
result.push_back(from_cbor_internal(v, idx));
idx += 8; // skip 8 content bytes
return get_from_vector<uint64_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x99) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
// Negative integer
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:
{
result.push_back(from_cbor_internal(v, idx));
return static_cast<int8_t>(0x20 - 1 - v[current_idx]);
}
return result;
}
else if (v[current_idx] == 0x9a) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
case 0x38: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 1; // skip content byte
// must be uint8_t !
return -1 - get_from_vector<uint8_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x9b) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
case 0x39: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 2; // skip 2 content bytes
return -1 - get_from_vector<int16_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x9f) // array (indefinite length)
{
basic_json result = value_t::array;
while (v[idx] != 0xff)
case 0x3a: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 4; // skip 4 content bytes
return -1 - get_from_vector<int32_t>(v, current_idx);
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] >= 0xa0 and v[current_idx] <= 0xb7) // map
{
basic_json result = value_t::object;
const size_t len = v[current_idx] - 0xa0;
for (size_t i = 0; i < len; ++i)
case 0x3b: // Negative integer
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
idx += 8; // skip 8 content bytes
return -1 - get_from_vector<int64_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0xb8) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
// UTF-8 string
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:
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const size_t len = v[current_idx] - 0x60;
const size_t offset = current_idx + 1;
idx += len; // skip content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xb9) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 2 size bytes
for (size_t i = 0; i < len; ++i)
case 0x78: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint8_t>(v, current_idx);
const size_t offset = current_idx + 2;
idx += len + 1; // skip size byte + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xba) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
case 0x79: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint16_t>(v, current_idx);
const size_t offset = current_idx + 3;
idx += len + 2; // skip 2 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xbb) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
case 0x7a: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint32_t>(v, current_idx);
const size_t offset = current_idx + 5;
idx += len + 4; // skip 4 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xbf) // map (indefinite length)
{
basic_json result = value_t::object;
while (v[idx] != 0xff)
case 0x7b: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint64_t>(v, current_idx);
const size_t offset = current_idx + 9;
idx += len + 8; // skip 8 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] == 0xf4) // false
{
return false;
}
else if (v[current_idx] == 0xf5) // true
{
return true;
}
else if (v[current_idx] == 0xf6) // null
{
return value_t::null;
}
else if (v[current_idx] == 0xf9) // Half-Precision Float
{
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 Figure 3.
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)
case 0x7f: // UTF-8 string (indefinite length)
{
val = std::ldexp(mant, -24);
std::string result;
while (v[idx] != 0xff)
{
string_t s = from_cbor_internal(v, idx);
result += s;
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (exp != 31)
// array
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 size_t len = 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
{
val = std::ldexp(mant + 1024, exp - 25);
basic_json result = value_t::array;
const auto len = 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;
}
else
case 0x99: // array
{
val = mant == 0 ? INFINITY : NAN;
basic_json result = value_t::array;
const auto len = 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;
}
return half & 0x8000 ? -val : val;
}
else if (v[current_idx] == 0xfa) // Single-Precision Float
{
// copy bytes in reverse order into the float variable
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
case 0x9a: // array
{
reinterpret_cast<uint8_t*>(&res)[sizeof(float) - byte - 1] = v[current_idx + 1 + byte];
basic_json result = value_t::array;
const auto len = 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;
}
idx += sizeof(float); // skip content bytes
return res;
}
else if (v[current_idx] == 0xfb) // Double-Precision Float
{
// copy bytes in reverse order into the double variable
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)
case 0x9b: // array
{
reinterpret_cast<uint8_t*>(&res)[sizeof(double) - byte - 1] = v[current_idx + 1 + byte];
basic_json result = value_t::array;
const auto len = 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 (v[idx] != 0xff)
{
result.push_back(from_cbor_internal(v, idx));
}
// skip break byte (0xFF)
idx += 1;
return result;
}
idx += sizeof(double); // skip content bytes
return res;
}
// 40..57 byte string
// 58 byte string
// 59 byte string
// 5a byte string
// 5b byte string
// 5f byte string
// 7f UTF-8 string with break
// 9f array with break
// bf map with break
// c0 Text-based date/time
// c1 Epoch-based date/time
// c2 Positive bignum
// c3 Positive bignum
// c4 Decimal Fraction
// c5 Bigfloat
// c6..d4 tagged item
// d5..d7 Expected Conversion
// d8..db more tagged items
// e0..f3 simple value
// f7 undefined
// f8 simple value
// f9 half-precision float
// ff break stop code
throw std::invalid_argument("error parsing a CBOR @ " + std::to_string(current_idx) + ": " + std::to_string(v[current_idx]));
// map
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 size_t len = v[current_idx] - 0xa0;
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb8: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb9: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 2 size bytes
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xba: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xbb: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
{
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 (v[idx] != 0xff)
{
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
{
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 Figure 3.
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 ? INFINITY : NAN;
}
return half & 0x8000 ? -val : val;
}
case 0xfa: // Single-Precision Float
{
// copy bytes in reverse order into the float variable
float res;
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
{
// copy bytes in reverse order into the double variable
double res;
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;
}
// 40..57 byte string
// 58 byte string
// 59 byte string
// 5a byte string
// 5b byte string
// 5f byte string
// 7f UTF-8 string with break
// 9f array with break
// bf map with break
// c0 Text-based date/time
// c1 Epoch-based date/time
// c2 Positive bignum
// c3 Positive bignum
// c4 Decimal Fraction
// c5 Bigfloat
// c6..d4 tagged item
// d5..d7 Expected Conversion
// d8..db more tagged items
// e0..f3 simple value
// f7 undefined
// f8 simple value
// f9 half-precision float
// ff break stop code
default:
{
throw std::invalid_argument("error parsing a CBOR @ " + std::to_string(current_idx) + ": " + std::to_string(v[current_idx]));
}
}
}
public:
......
src/json.hpp.re2c
View file @ f1b95d78
......@@ -6262,13 +6262,28 @@ class basic_json
}
}
/*
/*!
@brief take sufficient bytes from a vector to fill an integer variable
In the context of binary serialization formats, we need to read several
bytes from a byte vector and combine them to multi-byte integral data
types.
@param[in] vec byte vector to read from
@param[in] current_index the psition in the vector after which to read
@return the next sizeof(T) bytes from @a vec, in reverse order as T
@tparam T the integral return type
@throw std::out_of_range if there are less than sizeof(T)+1 bytes in the
vector @a vec to read
Precondition:
vec: | | | a | b | c | d | | | T: | | | | |
^ ^ ^ ^
current_index idx ptr sizeof(T)
current_index idx ptr sizeof(T)
Postcondition:
......@@ -6277,12 +6292,16 @@ class basic_json
| idx ptr
current_index
Code from <http://stackoverflow.com/a/41031865/266378>
@sa Code from <http://stackoverflow.com/a/41031865/266378>.
*/
template<typename T>
static T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_index)
{
if (current_index + sizeof(T) + 1 > vec.size())
{
throw std::out_of_range("cannot read " + std::to_string(sizeof(T)) + " bytes from vector");
}
T result;
uint8_t* ptr = reinterpret_cast<uint8_t*>(&result);
size_t idx = current_index + 1 + sizeof(T);
......@@ -6959,327 +6978,485 @@ class basic_json
// store and increment index
const size_t current_idx = idx++;
if (v[current_idx] <= 0x17) // Integer 0x00..0x17
{
return v[current_idx];
}
else if (v[current_idx] == 0x18) // Unsigned integer uint8_t
{
idx += 1; // skip content byte
return get_from_vector<uint8_t>(v, current_idx);
}
else if (v[current_idx] == 0x19) // Unsigned integer uint16_t
{
idx += 2; // skip 2 content bytes
return get_from_vector<uint16_t>(v, current_idx);
}
else if (v[current_idx] == 0x1a) // Unsigned integer uint32_t
{
idx += 4; // skip 4 content bytes
return get_from_vector<uint32_t>(v, current_idx);
}
else if (v[current_idx] == 0x1b) // Unsigned integer uint64_t
{
idx += 8; // skip 8 content bytes
return get_from_vector<uint64_t>(v, current_idx);
}
else if (v[current_idx] >= 0x20 and v[current_idx] <= 0x37) // Negative integer
{
return static_cast<int8_t>(0x20 - 1 - v[current_idx]);
}
else if (v[current_idx] == 0x38) // Negative integer
{
idx += 1; // skip content byte
// must be uint8_t !
return -1 - get_from_vector<uint8_t>(v, current_idx);
}
else if (v[current_idx] == 0x39) // Negative integer
{
idx += 2; // skip 2 content bytes
return -1 - get_from_vector<int16_t>(v, current_idx);
}
else if (v[current_idx] == 0x3a) // Negative integer
{
idx += 4; // skip 4 content bytes
return -1 - get_from_vector<int32_t>(v, current_idx);
}
else if (v[current_idx] == 0x3b) // Negative integer
{
idx += 8; // skip 8 content bytes
return -1 - get_from_vector<int64_t>(v, current_idx);
}
else if (v[current_idx] >= 0x60 and v[current_idx] <= 0x77) // UTF-8 string
{
const size_t len = v[current_idx] - 0x60;
const size_t offset = current_idx + 1;
idx += len; // skip content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x78) // UTF-8 string
{
const auto len = get_from_vector<uint8_t>(v, current_idx);
const size_t offset = current_idx + 2;
idx += len + 1; // skip size byte + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x79) // UTF-8 string
{
const auto len = get_from_vector<uint16_t>(v, current_idx);
const size_t offset = current_idx + 3;
idx += len + 2; // skip 2 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7a) // UTF-8 string
{
const auto len = get_from_vector<uint32_t>(v, current_idx);
const size_t offset = current_idx + 5;
idx += len + 4; // skip 4 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7b) // UTF-8 string
{
const auto len = get_from_vector<uint64_t>(v, current_idx);
const size_t offset = current_idx + 9;
idx += len + 8; // skip 8 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
else if (v[current_idx] == 0x7f) // UTF-8 string (indefinite length)
switch (v[current_idx])
{
std::string result;
while (v[idx] != 0xff)
// integer
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:
{
string_t s = from_cbor_internal(v, idx);
result += s;
return v[current_idx];
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] >= 0x80 and v[current_idx] <= 0x97) // array
{
basic_json result = value_t::array;
const size_t len = v[current_idx] - 0x80;
for (size_t i = 0; i < len; ++i)
case 0x18: // Unsigned integer uint8_t
{
idx += 1; // skip content byte
return get_from_vector<uint8_t>(v, current_idx);
}
case 0x19: // Unsigned integer uint16_t
{
idx += 2; // skip 2 content bytes
return get_from_vector<uint16_t>(v, current_idx);
}
case 0x1a: // Unsigned integer uint32_t
{
result.push_back(from_cbor_internal(v, idx));
idx += 4; // skip 4 content bytes
return get_from_vector<uint32_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x98) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
case 0x1b: // Unsigned integer uint64_t
{
result.push_back(from_cbor_internal(v, idx));
idx += 8; // skip 8 content bytes
return get_from_vector<uint64_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x99) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
// Negative integer
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:
{
result.push_back(from_cbor_internal(v, idx));
return static_cast<int8_t>(0x20 - 1 - v[current_idx]);
}
return result;
}
else if (v[current_idx] == 0x9a) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
case 0x38: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 1; // skip content byte
// must be uint8_t !
return -1 - get_from_vector<uint8_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x9b) // array
{
basic_json result = value_t::array;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
case 0x39: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 2; // skip 2 content bytes
return -1 - get_from_vector<int16_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0x9f) // array (indefinite length)
{
basic_json result = value_t::array;
while (v[idx] != 0xff)
case 0x3a: // Negative integer
{
result.push_back(from_cbor_internal(v, idx));
idx += 4; // skip 4 content bytes
return -1 - get_from_vector<int32_t>(v, current_idx);
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] >= 0xa0 and v[current_idx] <= 0xb7) // map
{
basic_json result = value_t::object;
const size_t len = v[current_idx] - 0xa0;
for (size_t i = 0; i < len; ++i)
case 0x3b: // Negative integer
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
idx += 8; // skip 8 content bytes
return -1 - get_from_vector<int64_t>(v, current_idx);
}
return result;
}
else if (v[current_idx] == 0xb8) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
// UTF-8 string
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:
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const size_t len = v[current_idx] - 0x60;
const size_t offset = current_idx + 1;
idx += len; // skip content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xb9) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 2 size bytes
for (size_t i = 0; i < len; ++i)
case 0x78: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint8_t>(v, current_idx);
const size_t offset = current_idx + 2;
idx += len + 1; // skip size byte + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xba) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
case 0x79: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint16_t>(v, current_idx);
const size_t offset = current_idx + 3;
idx += len + 2; // skip 2 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xbb) // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
case 0x7a: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint32_t>(v, current_idx);
const size_t offset = current_idx + 5;
idx += len + 4; // skip 4 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
return result;
}
else if (v[current_idx] == 0xbf) // map (indefinite length)
{
basic_json result = value_t::object;
while (v[idx] != 0xff)
case 0x7b: // UTF-8 string
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
const auto len = get_from_vector<uint64_t>(v, current_idx);
const size_t offset = current_idx + 9;
idx += len + 8; // skip 8 size bytes + content bytes
return std::string(reinterpret_cast<const char*>(v.data()) + offset, len);
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (v[current_idx] == 0xf4) // false
{
return false;
}
else if (v[current_idx] == 0xf5) // true
{
return true;
}
else if (v[current_idx] == 0xf6) // null
{
return value_t::null;
}
else if (v[current_idx] == 0xf9) // Half-Precision Float
{
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 Figure 3.
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)
case 0x7f: // UTF-8 string (indefinite length)
{
val = std::ldexp(mant, -24);
std::string result;
while (v[idx] != 0xff)
{
string_t s = from_cbor_internal(v, idx);
result += s;
}
// skip break byte (0xFF)
idx += 1;
return result;
}
else if (exp != 31)
// array
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 size_t len = 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
{
val = std::ldexp(mant + 1024, exp - 25);
basic_json result = value_t::array;
const auto len = 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;
}
else
case 0x99: // array
{
val = mant == 0 ? INFINITY : NAN;
basic_json result = value_t::array;
const auto len = 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;
}
return half & 0x8000 ? -val : val;
}
else if (v[current_idx] == 0xfa) // Single-Precision Float
{
// copy bytes in reverse order into the float variable
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
case 0x9a: // array
{
reinterpret_cast<uint8_t*>(&res)[sizeof(float) - byte - 1] = v[current_idx + 1 + byte];
basic_json result = value_t::array;
const auto len = 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;
}
idx += sizeof(float); // skip content bytes
return res;
}
else if (v[current_idx] == 0xfb) // Double-Precision Float
{
// copy bytes in reverse order into the double variable
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)
case 0x9b: // array
{
reinterpret_cast<uint8_t*>(&res)[sizeof(double) - byte - 1] = v[current_idx + 1 + byte];
basic_json result = value_t::array;
const auto len = 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 (v[idx] != 0xff)
{
result.push_back(from_cbor_internal(v, idx));
}
// skip break byte (0xFF)
idx += 1;
return result;
}
idx += sizeof(double); // skip content bytes
return res;
}
// 40..57 byte string
// 58 byte string
// 59 byte string
// 5a byte string
// 5b byte string
// 5f byte string
// 7f UTF-8 string with break
// 9f array with break
// bf map with break
// c0 Text-based date/time
// c1 Epoch-based date/time
// c2 Positive bignum
// c3 Positive bignum
// c4 Decimal Fraction
// c5 Bigfloat
// c6..d4 tagged item
// d5..d7 Expected Conversion
// d8..db more tagged items
// e0..f3 simple value
// f7 undefined
// f8 simple value
// f9 half-precision float
// ff break stop code
throw std::invalid_argument("error parsing a CBOR @ " + std::to_string(current_idx) + ": " + std::to_string(v[current_idx]));
// map
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 size_t len = v[current_idx] - 0xa0;
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb8: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint8_t>(v, current_idx);
idx += 1; // skip 1 size byte
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xb9: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint16_t>(v, current_idx);
idx += 2; // skip 2 size bytes
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xba: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint32_t>(v, current_idx);
idx += 4; // skip 4 size bytes
for (size_t i = 0; i < len; ++i)
{
std::string key = from_cbor_internal(v, idx);
result[key] = from_cbor_internal(v, idx);
}
return result;
}
case 0xbb: // map
{
basic_json result = value_t::object;
const auto len = get_from_vector<uint64_t>(v, current_idx);
idx += 8; // skip 8 size bytes
for (size_t i = 0; i < len; ++i)
{
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 (v[idx] != 0xff)
{
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
{
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 Figure 3.
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 ? INFINITY : NAN;
}
return half & 0x8000 ? -val : val;
}
case 0xfa: // Single-Precision Float
{
// copy bytes in reverse order into the float variable
float res;
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
{
// copy bytes in reverse order into the double variable
double res;
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;
}
// 40..57 byte string
// 58 byte string
// 59 byte string
// 5a byte string
// 5b byte string
// 5f byte string
// 7f UTF-8 string with break
// 9f array with break
// bf map with break
// c0 Text-based date/time
// c1 Epoch-based date/time
// c2 Positive bignum
// c3 Positive bignum
// c4 Decimal Fraction
// c5 Bigfloat
// c6..d4 tagged item
// d5..d7 Expected Conversion
// d8..db more tagged items
// e0..f3 simple value
// f7 undefined
// f8 simple value
// f9 half-precision float
// ff break stop code
default:
{
throw std::invalid_argument("error parsing a CBOR @ " + std::to_string(current_idx) + ": " + std::to_string(v[current_idx]));
}
}
}
public:
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment