e168b4e4a6
Owner-authorized source migration: 31 helper-only translation units were merged into their callers or existing inline headers; both build manifests updated. Includes the preserved source payload, Lua configuration matching wowdecomp, and exact malloca expansion without diagnostic pragmas. 449 native units compiled locally and 449 staged units compiled by the pinned server toolchain. No previously byte-matched function regressed. Compiler mapping diagnostics remain recorded as needs_cleanup, not accepted or peer-confirmed. Existing independent review records are preserved. README.md is intentionally unchanged.
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
#include "Archive/MemMapPakFile.h"
|
|
|
|
// INLINED
|
|
CMemMapPakFile::CMemMapPakFile() : m_handle(nullptr), m_mapping(nullptr), m_viewSize(0), m_windowSize(0x20000000), m_size(0), m_viewOffset(0), m_view(nullptr) {
|
|
SYSTEM_INFO information;
|
|
GetSystemInfo(&information);
|
|
this->m_offsetMask = 0xFFFFFFFF00000000ULL | static_cast<std::uint32_t>(~(information.dwAllocationGranularity - 1));
|
|
}
|
|
|
|
// OFFSET: 0x00AE9850
|
|
// OFFSET: 0x00AE9950
|
|
// FUNCTION: fn_18108
|
|
CMemMapPakFile::~CMemMapPakFile() {
|
|
this->Close();
|
|
}
|
|
|
|
// OFFSET: 0x00AEA420
|
|
// FUNCTION: fn_18119
|
|
std::uint64_t CMemMapPakFile::GetSize() const {
|
|
return this->m_size;
|
|
}
|
|
|
|
// OFFSET: 0x00AECB10
|
|
// FUNCTION: fn_18141
|
|
bool CMemMapPakFile::Open(const char* filename) {
|
|
this->m_handle = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
|
|
if (this->m_handle == INVALID_HANDLE_VALUE) {
|
|
this->m_handle = nullptr;
|
|
return false;
|
|
}
|
|
|
|
LARGE_INTEGER size;
|
|
GetFileSizeEx(this->m_handle, &size);
|
|
this->m_size = static_cast<std::uint64_t>(size.QuadPart);
|
|
this->m_viewOffset = 0;
|
|
this->m_viewSize = 0;
|
|
this->m_mapping = CreateFileMappingA(this->m_handle, nullptr, PAGE_READONLY, 0, 0, nullptr);
|
|
|
|
if (this->m_mapping) {
|
|
return true;
|
|
}
|
|
|
|
this->m_windowSize = 0;
|
|
return false;
|
|
}
|
|
|
|
// OFFSET: 0x00AECA50
|
|
// FUNCTION: fn_18139
|
|
void CMemMapPakFile::Close() {
|
|
if (this->m_windowSize && this->m_view) {
|
|
UnmapViewOfFile(this->m_view);
|
|
this->m_view = nullptr;
|
|
}
|
|
|
|
if (this->m_mapping) {
|
|
CloseHandle(this->m_mapping);
|
|
this->m_mapping = nullptr;
|
|
}
|
|
|
|
if (this->m_handle) {
|
|
CloseHandle(this->m_handle);
|
|
this->m_handle = nullptr;
|
|
}
|
|
}
|
|
|
|
// OFFSET: 0x00AECBB0
|
|
// FUNCTION: fn_18142
|
|
std::uint8_t* CMemMapPakFile::Read(std::uint64_t offset, std::uint32_t length) {
|
|
if (this->m_windowSize) {
|
|
if (offset >= this->m_viewOffset && offset + length <= this->m_viewOffset + this->m_viewSize) {
|
|
return this->m_view + static_cast<std::uint32_t>(offset - this->m_viewOffset);
|
|
}
|
|
|
|
if (this->m_view) {
|
|
UnmapViewOfFile(this->m_view);
|
|
this->m_view = nullptr;
|
|
}
|
|
|
|
while (this->m_windowSize >= length + (static_cast<std::uint32_t>(offset) & ~static_cast<std::uint32_t>(this->m_offsetMask))) {
|
|
this->m_viewOffset = offset & this->m_offsetMask;
|
|
this->m_viewSize = this->m_windowSize;
|
|
SIZE_T bytes = this->m_windowSize;
|
|
|
|
if (this->m_viewOffset + this->m_windowSize > this->m_size) {
|
|
bytes = 0;
|
|
this->m_viewSize = static_cast<std::uint32_t>(this->m_size - this->m_viewOffset);
|
|
}
|
|
|
|
this->m_view = static_cast<std::uint8_t*>(
|
|
MapViewOfFile(this->m_mapping, FILE_MAP_READ, static_cast<DWORD>(this->m_viewOffset >> 32), static_cast<DWORD>(this->m_viewOffset), bytes)
|
|
);
|
|
if (this->m_view) {
|
|
return this->m_view + static_cast<std::uint32_t>(offset - this->m_viewOffset);
|
|
}
|
|
|
|
this->m_windowSize >>= 1;
|
|
if (!this->m_windowSize) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
CloseHandle(this->m_mapping);
|
|
this->m_mapping = nullptr;
|
|
this->m_view = nullptr;
|
|
this->m_viewSize = 0;
|
|
this->m_windowSize = 0;
|
|
}
|
|
|
|
if (this->m_viewSize < length) {
|
|
this->m_viewSize = length;
|
|
this->m_buffer.resize(length);
|
|
this->m_view = this->m_buffer.data();
|
|
}
|
|
|
|
LARGE_INTEGER position;
|
|
position.QuadPart = static_cast<std::int64_t>(offset);
|
|
SetFilePointerEx(this->m_handle, position, nullptr, FILE_BEGIN);
|
|
DWORD read = 0;
|
|
|
|
if (ReadFile(this->m_handle, this->m_buffer.data(), length, &read, nullptr)) {
|
|
this->m_view = this->m_buffer.empty() ? nullptr : this->m_buffer.data();
|
|
return this->m_view;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|