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Permits int truncation, adds double decoder. Arrays still TODO.

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This commit is contained in:
Thomas Harte 2020-05-26 22:20:15 -04:00
parent 4d34d9ae2b
commit 023d76a3e7
1 changed files with 23 additions and 7 deletions
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30
Reflection/Struct.cpp
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@ -120,7 +120,9 @@ template <> bool Reflection::set(Struct &target, const std::string &name, int64_
return true;
}
// TODO: other int sizes.
#define SetInt(x) if(*target_type == typeid(x)) { x truncated_value = x(value); target.set(name, &truncated_value); }
ForAllInts(SetInt);
#undef SetInt
return false;
}
@ -537,7 +539,8 @@ bool Reflection::Struct::deserialise(const uint8_t *bson, size_t size) {
while(true) {
const uint8_t next_type = *bson;
++bson;
if(!next_type) break;
if(!next_type)
break;
std::string key;
while(*bson) {
@ -550,8 +553,6 @@ bool Reflection::Struct::deserialise(const uint8_t *bson, size_t size) {
default:
return false;
// TODO: arrays.
// 0x03: A subdocument; try to install the inner BSON.
// 0x05: Binary data. Seek to populate a std::vector<uint8_t>.
case 0x03:
@ -574,6 +575,19 @@ bool Reflection::Struct::deserialise(const uint8_t *bson, size_t size) {
}
} break;
// Array. BSON's encoding of these is a minor pain, but could be worse;
// they're presented as a subobject with objects serialised in array order
// but given the string keys "0", "1", etc. So: validate the keys, decode
// the objects.
case 0x04: {
uint32_t subobject_size;
read_int(subobject_size);
// TODO: parse objects.
bson += subobject_size - 4;
} break;
// String.
case 0x02: {
uint32_t length;
@ -611,10 +625,12 @@ bool Reflection::Struct::deserialise(const uint8_t *bson, size_t size) {
uint64_t value;
read_int(value);
// TODO: real conversion.
double double_value = double(value);
const double mantissa = 0.5 + double(value & 0x000f'ffff'ffff'ffff) / 9007199254740992.0;
const int exponent = ((value >> 52) & 2047) - 1022;
const double double_value = ldexp(mantissa, exponent);
const double sign = (value & 0x8000'0000'0000'0000) ? -1 : 1;
::Reflection::set(*this, key, double_value);
::Reflection::set(*this, key, double_value * sign);
} break;
}
}