| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkOSFile.h" |
| |
| #include <io.h> |
| #include <stdio.h> |
| #include <sys/stat.h> |
| |
| typedef struct { |
| ULONGLONG fVolume; |
| ULONGLONG fLsbSize; |
| ULONGLONG fMsbSize; |
| } SkFILEID; |
| |
| static bool sk_ino(SkFILE* f, SkFILEID* id) { |
| int fileno = _fileno((FILE*)f); |
| if (fileno < 0) { |
| return false; |
| } |
| |
| HANDLE file = (HANDLE)_get_osfhandle(fileno); |
| if (INVALID_HANDLE_VALUE == file) { |
| return false; |
| } |
| |
| //TODO: call GetFileInformationByHandleEx on Vista and later with FileIdInfo. |
| BY_HANDLE_FILE_INFORMATION info; |
| if (0 == GetFileInformationByHandle(file, &info)) { |
| return false; |
| } |
| id->fVolume = info.dwVolumeSerialNumber; |
| id->fLsbSize = info.nFileIndexLow + (((ULONGLONG)info.nFileIndexHigh) << 32); |
| id->fMsbSize = 0; |
| |
| return true; |
| } |
| |
| bool sk_fidentical(SkFILE* a, SkFILE* b) { |
| SkFILEID aID, bID; |
| return sk_ino(a, &aID) && sk_ino(b, &bID) |
| && aID.fLsbSize == bID.fLsbSize |
| && aID.fMsbSize == bID.fMsbSize |
| && aID.fVolume == bID.fVolume; |
| } |
| |
| template <typename HandleType, HandleType InvalidValue, BOOL (WINAPI * Close)(HandleType)> |
| class SkAutoTHandle : SkNoncopyable { |
| public: |
| SkAutoTHandle(HandleType handle) : fHandle(handle) { } |
| ~SkAutoTHandle() { Close(fHandle); } |
| operator HandleType() { return fHandle; } |
| bool isValid() { return InvalidValue != fHandle; } |
| private: |
| HandleType fHandle; |
| }; |
| typedef SkAutoTHandle<HANDLE, INVALID_HANDLE_VALUE, CloseHandle> SkAutoWinFile; |
| typedef SkAutoTHandle<HANDLE, NULL, CloseHandle> SkAutoWinMMap; |
| |
| void sk_fmunmap(const void* addr, size_t) { |
| UnmapViewOfFile(addr); |
| } |
| |
| void* sk_fmmap(SkFILE* f, size_t* length) { |
| size_t fileSize = sk_fgetsize(f); |
| if (0 == fileSize) { |
| return NULL; |
| } |
| |
| int fileno = _fileno((FILE*)f); |
| if (fileno < 0) { |
| return NULL; |
| } |
| |
| HANDLE file = (HANDLE)_get_osfhandle(fileno); |
| if (INVALID_HANDLE_VALUE == file) { |
| return NULL; |
| } |
| |
| SkAutoWinMMap mmap(CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL)); |
| if (!mmap.isValid()) { |
| //TODO: use SK_TRACEHR(GetLastError(), "Could not create file mapping.") to report. |
| return NULL; |
| } |
| |
| // Eventually call UnmapViewOfFile |
| void* addr = MapViewOfFile(mmap, FILE_MAP_READ, 0, 0, 0); |
| if (NULL == addr) { |
| //TODO: use SK_TRACEHR(GetLastError(), "Could not map view of file.") to report. |
| return NULL; |
| } |
| |
| *length = fileSize; |
| return addr; |
| } |