mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-08 13:50:20 +00:00
86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
#include "prx/libc/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 <string>
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#include <vector>
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static void Require(bool condition) {
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if (!condition) {
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std::fputs("GuestSubstringProtected check failed\n", stderr);
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std::abort();
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}
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}
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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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class Buffer {
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unsigned char* allocation;
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std::size_t page;
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public:
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Buffer() {
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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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allocation = static_cast<unsigned char*>(VirtualAlloc(nullptr, page * 3, MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS));
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Require(allocation != nullptr);
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DWORD previous;
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Require(VirtualProtect(allocation + page, page, PAGE_READWRITE, &previous) != 0);
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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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allocation = static_cast<unsigned char*>(mmap(nullptr, page * 3, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
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Require(allocation != MAP_FAILED);
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Require(mprotect(allocation + page, page, PROT_READ | PROT_WRITE) == 0);
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#endif
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std::memset(allocation + page, 0xa5, page);
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}
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~Buffer() {
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#ifdef _WIN32
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Require(VirtualFree(allocation, 0, MEM_RELEASE) != 0);
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#else
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Require(munmap(allocation, page * 3) == 0);
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#endif
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}
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Buffer(const Buffer&) = delete;
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Buffer& operator=(const Buffer&) = delete;
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unsigned char* At(std::size_t count) {
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Require(count <= page - 32);
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return allocation + page * 2 - (std::max)(count, std::size_t{1});
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}
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};
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int main() {
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Buffer hayBuffer, needleBuffer;
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for (std::size_t length = 0; length <= 160; ++length) {
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std::string repeating(length, 'a');
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if (!repeating.empty()) repeating.back() = 'b';
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const std::string high = std::string(length, static_cast<char>(0x80)) + static_cast<char>(0xff);
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for (const auto& haystack : {repeating, high}) {
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for (const auto& needle : {std::string{}, std::string("aab"), std::string("ba"), repeating,
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std::string("aaaaac"), std::string(3, static_cast<char>(0x80)) + static_cast<char>(0xff),
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haystack + "extra"}) {
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auto* hay = reinterpret_cast<char*>(hayBuffer.At(haystack.size() + 1));
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auto* query = reinterpret_cast<char*>(needleBuffer.At(needle.size() + 1));
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std::memcpy(hay, haystack.c_str(), haystack.size() + 1);
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std::memcpy(query, needle.c_str(), needle.size() + 1);
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const auto position = haystack.find(needle);
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Require(strstr_nid_postfix(hay, query) == (position == std::string::npos ? nullptr : hay + position));
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Require(std::memcmp(hay, haystack.c_str(), haystack.size() + 1) == 0);
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Require(std::memcmp(query, needle.c_str(), needle.size() + 1) == 0);
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}
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}
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}
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}
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