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comparison: gfx/skia/trunk/src/ports/SkOSFile_win.cpp
gfx/skia/trunk/src/ports/SkOSFile_win.cpp
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:32f87be147e6 |
|---|---|
| 1 /* | |
| 2 * Copyright 2013 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkOSFile.h" | |
| 9 | |
| 10 #include "SkTFitsIn.h" | |
| 11 | |
| 12 #include <io.h> | |
| 13 #include <stdio.h> | |
| 14 #include <sys/stat.h> | |
| 15 | |
| 16 typedef struct { | |
| 17 ULONGLONG fVolume; | |
| 18 ULONGLONG fLsbSize; | |
| 19 ULONGLONG fMsbSize; | |
| 20 } SkFILEID; | |
| 21 | |
| 22 static bool sk_ino(SkFILE* f, SkFILEID* id) { | |
| 23 int fileno = _fileno((FILE*)f); | |
| 24 if (fileno < 0) { | |
| 25 return false; | |
| 26 } | |
| 27 | |
| 28 HANDLE file = (HANDLE)_get_osfhandle(fileno); | |
| 29 if (INVALID_HANDLE_VALUE == file) { | |
| 30 return false; | |
| 31 } | |
| 32 | |
| 33 //TODO: call GetFileInformationByHandleEx on Vista and later with FileIdInfo. | |
| 34 BY_HANDLE_FILE_INFORMATION info; | |
| 35 if (0 == GetFileInformationByHandle(file, &info)) { | |
| 36 return false; | |
| 37 } | |
| 38 id->fVolume = info.dwVolumeSerialNumber; | |
| 39 id->fLsbSize = info.nFileIndexLow + (((ULONGLONG)info.nFileIndexHigh) << 32); | |
| 40 id->fMsbSize = 0; | |
| 41 | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 bool sk_fidentical(SkFILE* a, SkFILE* b) { | |
| 46 SkFILEID aID, bID; | |
| 47 return sk_ino(a, &aID) && sk_ino(b, &bID) | |
| 48 && aID.fLsbSize == bID.fLsbSize | |
| 49 && aID.fMsbSize == bID.fMsbSize | |
| 50 && aID.fVolume == bID.fVolume; | |
| 51 } | |
| 52 | |
| 53 class SkAutoNullKernelHandle : SkNoncopyable { | |
| 54 public: | |
| 55 SkAutoNullKernelHandle(const HANDLE handle) : fHandle(handle) { } | |
| 56 ~SkAutoNullKernelHandle() { CloseHandle(fHandle); } | |
| 57 operator HANDLE() const { return fHandle; } | |
| 58 bool isValid() const { return NULL != fHandle; } | |
| 59 private: | |
| 60 HANDLE fHandle; | |
| 61 }; | |
| 62 typedef SkAutoNullKernelHandle SkAutoWinMMap; | |
| 63 | |
| 64 void sk_fmunmap(const void* addr, size_t) { | |
| 65 UnmapViewOfFile(addr); | |
| 66 } | |
| 67 | |
| 68 void* sk_fdmmap(int fileno, size_t* length) { | |
| 69 HANDLE file = (HANDLE)_get_osfhandle(fileno); | |
| 70 if (INVALID_HANDLE_VALUE == file) { | |
| 71 return NULL; | |
| 72 } | |
| 73 | |
| 74 LARGE_INTEGER fileSize; | |
| 75 if (0 == GetFileSizeEx(file, &fileSize)) { | |
| 76 //TODO: use SK_TRACEHR(GetLastError(), "Could not get file size.") to report. | |
| 77 return NULL; | |
| 78 } | |
| 79 if (!SkTFitsIn<size_t>(fileSize.QuadPart)) { | |
| 80 return NULL; | |
| 81 } | |
| 82 | |
| 83 SkAutoWinMMap mmap(CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL)); | |
| 84 if (!mmap.isValid()) { | |
| 85 //TODO: use SK_TRACEHR(GetLastError(), "Could not create file mapping.") to report. | |
| 86 return NULL; | |
| 87 } | |
| 88 | |
| 89 // Eventually call UnmapViewOfFile | |
| 90 void* addr = MapViewOfFile(mmap, FILE_MAP_READ, 0, 0, 0); | |
| 91 if (NULL == addr) { | |
| 92 //TODO: use SK_TRACEHR(GetLastError(), "Could not map view of file.") to report. | |
| 93 return NULL; | |
| 94 } | |
| 95 | |
| 96 *length = static_cast<size_t>(fileSize.QuadPart); | |
| 97 return addr; | |
| 98 } | |
| 99 | |
| 100 int sk_fileno(SkFILE* f) { | |
| 101 return _fileno((FILE*)f); | |
| 102 } | |
| 103 | |
| 104 void* sk_fmmap(SkFILE* f, size_t* length) { | |
| 105 int fileno = sk_fileno(f); | |
| 106 if (fileno < 0) { | |
| 107 return NULL; | |
| 108 } | |
| 109 | |
| 110 return sk_fdmmap(fileno, length); | |
| 111 } |
