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MemoryMappedFile.cpp
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238 lines (197 loc) · 7.3 KB
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#include "il2cpp-config.h"
#if IL2CPP_USE_GENERIC_MEMORY_MAPPED_FILE
#include "os/File.h"
#include "os/MemoryMappedFile.h"
#include "os/Mutex.h"
#include "utils/dynamic_array.h"
#include "utils/Memory.h"
#include "Baselib.h"
#include "Cpp/ReentrantLock.h"
namespace il2cpp
{
namespace os
{
struct MemoryFileData
{
MemoryFileData(const char* name, int64_t dataSize)
: size(dataSize)
{
size_t nameSize = strlen(name);
mapName = (char*)IL2CPP_MALLOC(nameSize + 1);
strcpy(mapName, name);
handle = IL2CPP_MALLOC_ZERO((size_t)dataSize);
}
~MemoryFileData()
{
IL2CPP_FREE(mapName);
IL2CPP_FREE(handle);
}
char* mapName;
void* handle;
int64_t size;
};
struct MemoryFilesContext
{
baselib::ReentrantLock m_Mutex;
il2cpp::utils::dynamic_array<MemoryFileData*> m_MemoryFiles;
il2cpp::utils::dynamic_array<void*> m_MemoryFileViews;
};
MemoryFilesContext* s_MemoryFilesContext = nullptr;
static bool IsMemoryFile(void* possibleMemoryFile)
{
os::FastAutoLock lock(&s_MemoryFilesContext->m_Mutex);
for (il2cpp::utils::dynamic_array<MemoryFileData*>::const_iterator it = s_MemoryFilesContext->m_MemoryFiles.begin(); it != s_MemoryFilesContext->m_MemoryFiles.end(); ++it)
{
if ((*it)->handle == possibleMemoryFile)
return true;
}
return false;
}
static MemoryFileData* FindMemoryFile(void* possibleMemoryFile)
{
for (il2cpp::utils::dynamic_array<MemoryFileData*>::iterator it = s_MemoryFilesContext->m_MemoryFiles.begin(); it != s_MemoryFilesContext->m_MemoryFiles.end(); ++it)
{
if ((*it)->handle == possibleMemoryFile)
{
return *it;
}
}
return NULL;
}
static MemoryFileData* FindMemoryFile(const char* mapName)
{
for (il2cpp::utils::dynamic_array<MemoryFileData*>::iterator it = s_MemoryFilesContext->m_MemoryFiles.begin(); it != s_MemoryFilesContext->m_MemoryFiles.end(); ++it)
{
if (strcmp((*it)->mapName, mapName) == 0)
{
return *it;
}
}
return NULL;
}
static bool IsMemoryFileView(void* possibleMemoryFile)
{
os::FastAutoLock lock(&s_MemoryFilesContext->m_Mutex);
return std::find(s_MemoryFilesContext->m_MemoryFileViews.begin(), s_MemoryFilesContext->m_MemoryFileViews.end(), possibleMemoryFile) != s_MemoryFilesContext->m_MemoryFileViews.end();
}
void MemoryMappedFile::AllocateStaticData()
{
s_MemoryFilesContext = new MemoryFilesContext();
}
void MemoryMappedFile::FreeStaticData()
{
delete s_MemoryFilesContext;
s_MemoryFilesContext = nullptr;
}
FileHandle* MemoryMappedFile::Create(FileHandle* file, const char* mapName, int32_t mode, int64_t *capacity, MemoryMappedFileAccess access, int32_t options, MemoryMappedFileError* error)
{
if (file == NULL)
{
if (mapName != NULL)
{
os::FastAutoLock lock(&s_MemoryFilesContext->m_Mutex);
const MemoryFileData* memoryFileData = FindMemoryFile(mapName);
if (memoryFileData != NULL)
{
file = (FileHandle*)memoryFileData->handle;
}
else
{
MemoryFileData* memoryFileData = new MemoryFileData(mapName, *capacity);
s_MemoryFilesContext->m_MemoryFiles.push_back(memoryFileData);
file = (FileHandle*)memoryFileData->handle;
}
}
}
return file;
}
static MemoryMappedFile::MemoryMappedFileHandle ViewRealFile(FileHandle* mappedFileHandle, int64_t* length, int64_t offset, MemoryMappedFileAccess access, MemoryMappedFileError* error)
{
int fileError = 0;
if (*length == 0)
{
*length = os::File::GetLength(mappedFileHandle, &fileError);
if (fileError != 0)
{
if (error != NULL)
*error = COULD_NOT_MAP_MEMORY;
return NULL;
}
}
void* buffer = IL2CPP_MALLOC_ZERO((size_t)*length);
os::File::Seek(mappedFileHandle, offset, 0, &fileError);
if (fileError != 0)
{
IL2CPP_FREE(buffer);
if (error != NULL)
*error = COULD_NOT_MAP_MEMORY;
return NULL;
}
int bytesRead = File::Read(mappedFileHandle, (char*)buffer, (int)*length, &fileError);
if (bytesRead != *length || fileError != 0)
{
IL2CPP_FREE(buffer);
if (error != NULL)
*error = COULD_NOT_MAP_MEMORY;
return NULL;
}
return buffer;
}
static MemoryMappedFile::MemoryMappedFileHandle ViewMemoryFile(void* mappedFileHandle, int64_t* length, int64_t offset, MemoryMappedFileAccess access, MemoryMappedFileError* error)
{
os::FastAutoLock lock(&s_MemoryFilesContext->m_Mutex);
const MemoryFileData* memoryFileData = FindMemoryFile(mappedFileHandle);
IL2CPP_ASSERT(memoryFileData != NULL);
if (*length == 0)
*length = memoryFileData->size;
if (*length > memoryFileData->size)
{
if (error != NULL)
*error = COULD_NOT_MAP_MEMORY;
return NULL;
}
void* memoryMappedFileView = (uint8_t*)memoryFileData->handle + offset;
s_MemoryFilesContext->m_MemoryFileViews.push_back(memoryMappedFileView);
return memoryMappedFileView;
}
MemoryMappedFile::MemoryMappedFileHandle MemoryMappedFile::View(FileHandle* mappedFileHandle, int64_t* length, int64_t offset, MemoryMappedFileAccess access, int64_t* actualOffset, MemoryMappedFileError* error)
{
IL2CPP_ASSERT(actualOffset != NULL);
*actualOffset = offset;
if (IsMemoryFile((void*)mappedFileHandle))
return ViewMemoryFile((void*)mappedFileHandle, length, offset, access, error);
else
return ViewRealFile(mappedFileHandle, length, offset, access, error);
}
void MemoryMappedFile::Flush(MemoryMappedFileHandle memoryMappedFileData, int64_t length)
{
}
bool MemoryMappedFile::UnmapView(MemoryMappedFileHandle memoryMappedFileData, int64_t length)
{
if (IsMemoryFileView(memoryMappedFileData))
s_MemoryFilesContext->m_MemoryFileViews.erase_swap_back(&memoryMappedFileData);
else if (!IsMemoryFile(memoryMappedFileData))
IL2CPP_FREE(memoryMappedFileData);
return true;
}
bool MemoryMappedFile::Close(FileHandle* file)
{
os::FastAutoLock lock(&s_MemoryFilesContext->m_Mutex);
MemoryFileData* memoryFileData = FindMemoryFile((void*)file);
if (memoryFileData != NULL)
{
delete memoryFileData;
s_MemoryFilesContext->m_MemoryFiles.erase_swap_back(&memoryFileData);
}
return true;
}
void MemoryMappedFile::ConfigureHandleInheritability(FileHandle* file, bool inheritability)
{
}
bool MemoryMappedFile::OwnsDuplicatedFileHandle(FileHandle* file)
{
return true;
}
}
}
#endif