mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-05 13:20:11 +00:00
100 lines
3.4 KiB
C++
100 lines
3.4 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("GuestStrcmpBoundary 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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static int Sign(int value) {
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return (value > 0) - (value < 0);
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}
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int main() {
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Buffer first, second;
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for (std::size_t count = 0; count <= 128; ++count) {
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auto* left = first.At(count + 1);
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auto* right = second.At(count + 1);
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for (std::size_t index = 0; index < count; ++index) left[index] = static_cast<unsigned char>(1 + (index * 73 + count) % 255);
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left[count] = 0;
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const std::vector<unsigned char> saved(left, left + count + 1);
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for (std::size_t position = 0; position <= count; ++position) {
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for (unsigned char value : {0, 1, 127, 128, 255}) {
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if (position == count && value != 0) continue;
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std::copy(saved.begin(), saved.end(), right);
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right[position] = value;
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int expected = 0;
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for (std::size_t index = 0; index <= count; ++index) {
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if (left[index] != right[index]) { expected = static_cast<int>(left[index]) - right[index]; break; }
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if (left[index] == 0) break;
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}
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const std::vector<unsigned char> other(right, right + count + 1);
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Require(Sign(strcmp_nid_postfix(reinterpret_cast<char*>(left), reinterpret_cast<char*>(right))) == Sign(expected));
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Require(std::equal(saved.begin(), saved.end(), left));
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Require(std::equal(other.begin(), other.end(), right));
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}
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}
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}
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}
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