mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-04 13:07:32 +00:00
89 lines
3.1 KiB
C++
89 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("GuestStrxfrmBoundary 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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template<class T = unsigned char>
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T* At(std::size_t count) {
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Require(count <= (page - 32) / sizeof(T));
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return reinterpret_cast<T*>(allocation + page * 2 - (std::max)(count, std::size_t{1}) * sizeof(T));
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}
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};
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template<class T>
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static void Prefix(const T* data) {
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for (int index = 1; index <= 8; ++index) Require(data[-index] == static_cast<T>(sizeof(T) == 1 ? 0xa5 : 0xa5a5));
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}
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int main() {
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Buffer input, output;
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for (std::size_t length = 0; length <= 128; ++length) {
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auto* source = input.At<char>(length + 1);
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for (std::size_t i = 0; i < length; ++i) source[i] = static_cast<char>(1 + (i * 73 + length) % 255);
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source[length] = 0;
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const std::vector<char> saved(source, source + length + 1);
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for (std::size_t capacity : {std::size_t{0}, std::size_t{1}, length, length + 1, length + 7}) {
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auto* destination = output.At<char>(capacity);
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const auto extent = (std::max)(capacity, std::size_t{1});
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std::memset(destination - 8, 0xa5, (extent + 8) * sizeof(char));
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Require(strxfrm_nid_postfix(destination, source, capacity) == length);
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if (length < capacity) Require(std::equal(saved.begin(), saved.end(), destination));
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if (capacity == 0) Require(destination[0] == static_cast<char>(static_cast<char>(0xa5)));
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Prefix(reinterpret_cast<unsigned char*>(destination));
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Require(std::equal(saved.begin(), saved.end(), source));
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}
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}
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}
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