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🔨 added endianess check

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This commit is contained in:
Niels Lohmann 2017-04-04 17:30:43 +02:00
parent b15fc13dd1
commit c28bf823bc
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GPG key ID: 7F3CEA63AE251B69
1 changed files with 31 additions and 11 deletions
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40
src/json.hpp
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@ -9364,11 +9364,13 @@ class basic_json
{
public:
explicit binary_reader(std::istream& i)
: ia(new cached_input_stream_adapter(i, 16384))
: ia(new cached_input_stream_adapter(i, 16384)),
is_little_endian(little_endianess())
{}
binary_reader(const char* buff, const size_t len)
: ia(new input_buffer_adapter(buff, len))
: ia(new input_buffer_adapter(buff, len)),
is_little_endian(little_endianess())
{}
~binary_reader()
@ -9555,7 +9557,7 @@ class basic_json
case 0x97:
{
basic_json result = value_t::array;
const auto len = static_cast<size_t>(current - 0x80);
const auto len = static_cast<size_t>(current & 0x1f);
for (size_t i = 0; i < len; ++i)
{
result.push_back(parse_cbor());
@ -9644,7 +9646,7 @@ class basic_json
case 0xb7:
{
basic_json result = value_t::object;
const auto len = static_cast<size_t>(current - 0xa0);
const auto len = static_cast<size_t>(current & 0x1f);
for (size_t i = 0; i < len; ++i)
{
get();
@ -9780,7 +9782,7 @@ class basic_json
default: // anything else (0xFF is handled inside the other types)
{
std::stringstream ss;
ss << std::hex << current;
ss << std::setw(2) << std::setfill('0') << std::hex << current;
JSON_THROW(parse_error::create(112, chars_read, "error reading CBOR; last byte: 0x" + ss.str()));
}
}
@ -10182,20 +10184,26 @@ class basic_json
default: // anything else
{
std::stringstream ss;
ss << std::hex << current;
ss << std::setw(2) << std::setfill('0') << std::hex << current;
JSON_THROW(parse_error::create(112, chars_read, "error reading MessagePack; last byte: 0x" + ss.str()));
}
}
}
private:
// from http://stackoverflow.com/a/1001328/266378
static bool little_endianess()
{
int num = 1;
return (*reinterpret_cast<char*>(&num) == 1);
}
int get()
{
++chars_read;
return (current = ia->get_character());
}
// todo: check if this breaks with endianess
template<typename T>
T get_number()
{
@ -10204,8 +10212,17 @@ class basic_json
{
get();
check_eof();
// reverse byte order prior to conversion if necessary
if (is_little_endian)
{
vec[sizeof(T) - i - 1] = static_cast<uint8_t>(current);
}
else
{
vec[i] = static_cast<uint8_t>(current);
}
}
T result;
std::memcpy(&result, vec.data(), sizeof(T));
@ -10256,7 +10273,7 @@ class basic_json
case 0x76:
case 0x77:
{
const auto len = static_cast<size_t>(current - 0x60);
const auto len = static_cast<size_t>(current & 0x1f);
return get_string(len);
}
@ -10298,7 +10315,7 @@ class basic_json
default:
{
std::stringstream ss;
ss << std::hex << current;
ss << std::setw(2) << std::setfill('0') << std::hex << current;
JSON_THROW(parse_error::create(113, chars_read, "expected a CBOR string; last byte: 0x" + ss.str()));
}
}
@ -10369,7 +10386,7 @@ class basic_json
default:
{
std::stringstream ss;
ss << std::hex << current;
ss << std::setw(2) << std::setfill('0') << std::hex << current;
JSON_THROW(parse_error::create(113, chars_read, "expected a MessagePack string; last byte: 0x" + ss.str()));
}
}
@ -10392,6 +10409,9 @@ class basic_json
/// the number of characters read
size_t chars_read = 0;
/// whether we can assume little endianess
const bool is_little_endian = true;
};
public: