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SpeedBreaker ProjectandClaude Opus 5.5
a6ade41b9f
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
// SpeedBreaker runtime. GPL-3.0-or-later (see COPYING).
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//
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// Runtime-library (Rtl*) helpers. Reference: Xenia's xboxkrnl_rtl.cc, except
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// RtlCompareMemory / RtlCompareMemoryUlong, which follow NT semantics (bytes
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// matching up to the first difference) where Xenia counts every match.
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#include <stdafx.h>
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#include "function.h"
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uint32_t RtlCompareMemory(const uint8_t* a, const uint8_t* b, uint32_t length)
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{
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uint32_t n = 0;
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while (n < length && a[n] == b[n])
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n++;
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return n;
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}
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uint32_t RtlCompareMemoryUlong(const be<uint32_t>* source, uint32_t length, uint32_t pattern)
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{
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uint32_t n = 0;
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while (n + 4 <= length && source[n / 4] == pattern)
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n += 4;
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return n;
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}
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void RtlFillMemoryUlong(be<uint32_t>* destination, uint32_t length, uint32_t pattern)
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{
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for (uint32_t i = 0; i < length / 4; i++)
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destination[i] = pattern;
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}
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struct X_UNICODE_STRING
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{
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be<uint16_t> length;
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be<uint16_t> maximumLength;
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be<uint32_t> buffer;
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};
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void RtlInitUnicodeString(X_UNICODE_STRING* destination, const be<uint16_t>* source)
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{
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if (source == nullptr)
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{
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destination->length = 0;
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destination->maximumLength = 0;
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destination->buffer = 0;
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return;
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}
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uint16_t chars = 0;
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while (source[chars] != 0)
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chars++;
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destination->length = chars * 2;
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destination->maximumLength = (chars + 1) * 2;
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destination->buffer = g_memory.MapVirtual(source);
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}
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// FILETIME (100 ns since 1601) <-> calendar fields, via C++20 chrono.
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constexpr int64_t FILETIME_EPOCH_DIFFERENCE = 116444736000000000LL;
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void RtlTimeToTimeFields(const be<int64_t>* time, XTIME_FIELDS* fields)
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{
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using namespace std::chrono;
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sys_time<microseconds> tp{ microseconds((int64_t(*time) - FILETIME_EPOCH_DIFFERENCE) / 10) };
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auto dp = floor<days>(tp);
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year_month_day ymd{ dp };
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hh_mm_ss hms{ floor<milliseconds>(tp - dp) };
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fields->Year = uint16_t(int(ymd.year()));
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fields->Month = uint16_t(unsigned(ymd.month()));
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fields->Day = uint16_t(unsigned(ymd.day()));
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fields->Hour = uint16_t(hms.hours().count());
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fields->Minute = uint16_t(hms.minutes().count());
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fields->Second = uint16_t(hms.seconds().count());
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fields->Milliseconds = uint16_t(hms.subseconds().count());
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fields->Weekday = uint16_t(weekday{ dp }.c_encoding());
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}
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uint32_t RtlTimeFieldsToTime(const XTIME_FIELDS* fields, be<int64_t>* time)
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{
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using namespace std::chrono;
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uint16_t y = fields->Year, mo = fields->Month, d = fields->Day;
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if (y < 1601 || mo < 1 || mo > 12 || d < 1 || d > 31 || fields->Hour > 23 || fields->Minute > 59 ||
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fields->Second > 59 || fields->Milliseconds > 999)
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return 0;
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year_month_day ymd{ year{ y }, month{ mo }, day{ d } };
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if (!ymd.ok())
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return 0;
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auto tp = sys_days{ ymd } + hours{ uint16_t(fields->Hour) } + minutes{ uint16_t(fields->Minute) } +
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seconds{ uint16_t(fields->Second) } + milliseconds{ uint16_t(fields->Milliseconds) };
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*time = duration_cast<microseconds>(tp.time_since_epoch()).count() * 10 + FILETIME_EPOCH_DIFFERENCE;
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return 1;
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}
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GUEST_FUNCTION_HOOK(__imp__RtlCompareMemory, RtlCompareMemory);
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GUEST_FUNCTION_HOOK(__imp__RtlCompareMemoryUlong, RtlCompareMemoryUlong);
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GUEST_FUNCTION_HOOK(__imp__RtlFillMemoryUlong, RtlFillMemoryUlong);
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GUEST_FUNCTION_HOOK(__imp__RtlInitUnicodeString, RtlInitUnicodeString);
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GUEST_FUNCTION_HOOK(__imp__RtlTimeToTimeFields, RtlTimeToTimeFields);
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GUEST_FUNCTION_HOOK(__imp__RtlTimeFieldsToTime, RtlTimeFieldsToTime);
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