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float_sto_set

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This commit is contained in:
tequ
2025-09-29 12:50:03 +09:00
parent a62bac3fcd
commit e3c4644151
3 changed files with 82 additions and 62 deletions
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68
src/ripple/app/hook/impl/applyHook.cpp
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@@ -4253,69 +4253,13 @@ DEFINE_HOOK_FUNCTION(
if (NOT_IN_BOUNDS(read_ptr, read_len, memory_length))
return OUT_OF_BOUNDS;
uint8_t* upto = memory + read_ptr;
Bytes data{read_ptr + memory, read_ptr + read_len + memory};
if (read_len > 8)
{
uint8_t hi = memory[read_ptr] >> 4U;
uint8_t lo = memory[read_ptr] & 0xFU;
if (hi == 0 && lo == 0)
{
// typecode >= 16 && fieldcode >= 16
if (read_len < 11)
return NOT_AN_OBJECT;
upto += 3;
read_len -= 3;
}
else if (hi == 0 || lo == 0)
{
// typecode >= 16 && fieldcode < 16
if (read_len < 10)
return NOT_AN_OBJECT;
upto += 2;
read_len -= 2;
}
else
{
// typecode < 16 && fieldcode < 16
upto++;
read_len--;
}
}
if (read_len < 8)
return NOT_AN_OBJECT;
bool is_xrp = (((*upto) & 0b10000000U) == 0);
bool is_negative = (((*upto) & 0b01000000U) == 0);
int32_t exponent = 0;
if (is_xrp)
{
// exponent remains 0
upto++;
}
else
{
exponent = (((*upto++) & 0b00111111U)) << 2U;
exponent += ((*upto) >> 6U);
exponent -= 97;
}
uint64_t mantissa = (((uint64_t)(*upto++)) & 0b00111111U) << 48U;
mantissa += ((uint64_t)*upto++) << 40U;
mantissa += ((uint64_t)*upto++) << 32U;
mantissa += ((uint64_t)*upto++) << 24U;
mantissa += ((uint64_t)*upto++) << 16U;
mantissa += ((uint64_t)*upto++) << 8U;
mantissa += ((uint64_t)*upto++);
if (mantissa == 0)
return 0;
return hook_float::normalize_xfl(mantissa, exponent, is_negative);
hook::HookAPI api(hookCtx);
auto const result = api.float_sto_set(data);
if (!result)
return result.error();
return result.value();
HOOK_TEARDOWN();
}