Index: src/ports/SkOSFile_win.cpp |
=================================================================== |
--- src/ports/SkOSFile_win.cpp (revision 0) |
+++ src/ports/SkOSFile_win.cpp (working copy) |
@@ -0,0 +1,99 @@ |
+/* |
+ * 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; |
+} |