mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-08 13:50:20 +00:00
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
#include "prx/libSceRandom/include/Api.hpp"
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#include <algorithm>
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#include <array>
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <memory>
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#include <source_location>
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#include <span>
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#include <string>
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#include <vector>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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static void Require(bool value, std::source_location location = std::source_location::current()) {
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if (!value) {
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std::fprintf(stderr, "boundary check failed at line %u\n", location.line());
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std::abort();
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}
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}
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class Guarded {
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unsigned char* memory;
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std::size_t page;
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std::size_t writable;
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public:
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explicit Guarded(std::size_t capacity = 1) {
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#ifdef _WIN32
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SYSTEM_INFO info{};
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GetSystemInfo(&info);
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page = info.dwPageSize;
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#else
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const long size = sysconf(_SC_PAGESIZE);
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Require(size > 0);
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page = static_cast<std::size_t>(size);
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#endif
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writable = ((capacity + 128 + page - 1) / page) * page;
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#ifdef _WIN32
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memory = static_cast<unsigned char*>(VirtualAlloc(nullptr, writable + page * 2, MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS));
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Require(memory != nullptr);
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#else
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memory = static_cast<unsigned char*>(mmap(nullptr, writable + page * 2, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
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Require(memory != MAP_FAILED);
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#endif
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Reset();
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}
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~Guarded() {
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#ifdef _WIN32
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Require(VirtualFree(memory, 0, MEM_RELEASE) != 0);
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#else
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Require(munmap(memory, writable + page * 2) == 0);
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#endif
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}
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Guarded(const Guarded&) = delete;
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Guarded& operator=(const Guarded&) = delete;
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void Protect(bool readOnly) {
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#ifdef _WIN32
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DWORD previous;
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Require(VirtualProtect(memory + page, writable, readOnly ? PAGE_READONLY : PAGE_READWRITE, &previous) != 0);
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#else
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Require(mprotect(memory + page, writable, readOnly ? PROT_READ : PROT_READ | PROT_WRITE) == 0);
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#endif
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}
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void Reset() {
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Protect(false);
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std::memset(memory + page, 0xa5, writable);
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}
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unsigned char* End(std::size_t count) {
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Require(count + 64 <= writable);
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return memory + page + writable - (std::max)(count, std::size_t{1});
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}
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void Prefix(const void* address) const {
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const auto* bytes = static_cast<const unsigned char*>(address);
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for (int index = 1; index <= 32; ++index) Require(bytes[-index] == 0xa5);
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}
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};
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int main() {
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Guarded output(65);
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for (std::size_t size = 0; size <= 64; ++size) {
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output.Reset();
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auto* bytes = output.End(size);
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Require(sceRandomGetRandomNumber(bytes, size) == 0);
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output.Prefix(bytes);
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if (size == 0) Require(bytes[0] == 0xa5);
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}
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for (const auto size : {std::size_t{65}, SIZE_MAX}) {
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output.Reset();
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auto* bytes = output.End(65);
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Require(sceRandomGetRandomNumber(bytes, size) == static_cast<int>(0x817c0016));
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Require(std::all_of(bytes, bytes + 65, [](auto value) { return value == 0xa5; }));
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output.Prefix(bytes);
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}
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std::puts("65 valid random extents and 2 rejected lengths passed");
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}
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