89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
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#include "il2cpp-config.h"
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#if !RUNTIME_TINY
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#include "MemoryMappedFile.h"
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#include "Baselib.h"
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#include "Cpp/ReentrantLock.h"
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namespace il2cpp
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{
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namespace utils
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{
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static baselib::ReentrantLock s_Mutex;
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static std::map<void*, os::FileHandle*> s_MappedAddressToMappedFileObject;
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static std::map<void*, int64_t> s_MappedAddressToMappedLength;
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void* MemoryMappedFile::Map(os::FileHandle* file)
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{
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return Map(file, 0, 0);
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}
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bool MemoryMappedFile::Unmap(void* address)
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{
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return Unmap(address, 0);
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}
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void* MemoryMappedFile::Map(os::FileHandle* file, int64_t length, int64_t offset)
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{
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return Map(file, length, offset, os::MMAP_FILE_ACCESS_READ);
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}
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void* MemoryMappedFile::Map(os::FileHandle* file, int64_t length, int64_t offset, int32_t access)
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{
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os::FastAutoLock lock(&s_Mutex);
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int64_t unused = 0;
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os::MemoryMappedFileError error = os::NO_MEMORY_MAPPED_FILE_ERROR;
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os::FileHandle* mappedFileHandle = os::MemoryMappedFile::Create(file, NULL, 0, &unused, (os::MemoryMappedFileAccess)access, 0, &error);
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if (error != 0)
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return NULL;
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int64_t actualOffset = offset;
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void* address = os::MemoryMappedFile::View(mappedFileHandle, &length, offset, (os::MemoryMappedFileAccess)access, &actualOffset, &error);
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if (address != NULL)
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{
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address = (uint8_t*)address + (offset - actualOffset);
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if (os::MemoryMappedFile::OwnsDuplicatedFileHandle(mappedFileHandle))
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s_MappedAddressToMappedFileObject[address] = mappedFileHandle;
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s_MappedAddressToMappedLength[address] = length;
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}
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return address;
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}
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bool MemoryMappedFile::Unmap(void* address, int64_t length)
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{
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os::FastAutoLock lock(&s_Mutex);
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if (length == 0)
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{
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std::map<void*, int64_t>::iterator entry = s_MappedAddressToMappedLength.find(address);
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if (entry != s_MappedAddressToMappedLength.end())
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{
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length = entry->second;
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s_MappedAddressToMappedLength.erase(entry);
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}
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}
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bool success = os::MemoryMappedFile::UnmapView(address, length);
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if (!success)
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return false;
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std::map<void*, os::FileHandle*>::iterator entry = s_MappedAddressToMappedFileObject.find(address);
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if (entry != s_MappedAddressToMappedFileObject.end())
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{
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bool result = os::MemoryMappedFile::Close(entry->second);
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s_MappedAddressToMappedFileObject.erase(entry);
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return result;
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}
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return true;
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}
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}
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}
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#endif
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