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BSON: Extend binary_reader::get_number to be able to hanlde little endian input to get rid of binary_reader::get_number_little_endian

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This commit is contained in:
Julian Becker 2018-09-29 11:33:01 +02:00
parent ef358ae695
commit 0a09db9cc2
2 changed files with 16 additions and 72 deletions
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44
single_include/nlohmann/json.hpp
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@ -6161,7 +6161,7 @@ class binary_reader
case 0x01: // double
{
double number;
get_number_little_endian(number);
get_number<double, true>(number);
sax->number_float(static_cast<number_float_t>(number), "");
}
break;
@ -6169,7 +6169,7 @@ class binary_reader
{
std::int32_t len;
string_t value;
get_number_little_endian(len);
get_number<std::int32_t, true>(len);
get_string(len - 1ul, value);
get();
sax->string(value);
@ -6183,14 +6183,14 @@ class binary_reader
case 0x10: // int32
{
std::int32_t value;
get_number_little_endian(value);
get_number<std::int32_t, true>(value);
sax->number_integer(static_cast<std::int32_t>(value));
}
break;
case 0x12: // int64
{
std::int64_t value;
get_number_little_endian(value);
get_number<std::int64_t, true>(value);
sax->number_integer(static_cast<std::int64_t>(value));
}
break;
@ -6217,7 +6217,7 @@ class binary_reader
bool parse_bson_array()
{
std::int32_t documentSize;
get_number_little_endian(documentSize);
get_number<std::int32_t, true>(documentSize);
if (JSON_UNLIKELY(not sax->start_array(-1)))
{
@ -6235,7 +6235,7 @@ class binary_reader
bool parse_bson_internal()
{
std::int32_t documentSize;
get_number_little_endian(documentSize);
get_number<std::int32_t, true>(documentSize);
if (JSON_UNLIKELY(not sax->start_object(-1)))
{
@ -7000,7 +7000,7 @@ class binary_reader
bytes in CBOR, MessagePack, and UBJSON are stored in network order
(big endian) and therefore need reordering on little endian systems.
*/
template<typename NumberType>
template<typename NumberType, bool InputIsLittleEndian = false>
bool get_number(NumberType& result)
{
// step 1: read input into array with system's byte order
@ -7014,7 +7014,7 @@ class binary_reader
}
// reverse byte order prior to conversion if necessary
if (is_little_endian)
if (is_little_endian && !InputIsLittleEndian)
{
vec[sizeof(NumberType) - i - 1] = static_cast<uint8_t>(current);
}
@ -7029,34 +7029,6 @@ class binary_reader
return true;
}
template<typename NumberType>
bool get_number_little_endian(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()))
{
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