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/*
* 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 "SkTFitsIn.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;
}
class SkAutoNullKernelHandle : SkNoncopyable {
public:
SkAutoNullKernelHandle(const HANDLE handle) : fHandle(handle) { }
~SkAutoNullKernelHandle() { CloseHandle(fHandle); }
operator HANDLE() const { return fHandle; }
bool isValid() const { return NULL != fHandle; }
private:
HANDLE fHandle;
};
typedef SkAutoNullKernelHandle SkAutoWinMMap;
void sk_fmunmap(const void* addr, size_t) {
UnmapViewOfFile(addr);
}
void* sk_fdmmap(int fileno, size_t* length) {
HANDLE file = (HANDLE)_get_osfhandle(fileno);
if (INVALID_HANDLE_VALUE == file) {
return NULL;
}
LARGE_INTEGER fileSize;
if (0 == GetFileSizeEx(file, &fileSize)) {
//TODO: use SK_TRACEHR(GetLastError(), "Could not get file size.") to report.
return NULL;
}
if (!SkTFitsIn<size_t>(fileSize.QuadPart)) {
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 = static_cast<size_t>(fileSize.QuadPart);
return addr;
}
int sk_fileno(SkFILE* f) {
return _fileno((FILE*)f);
}
void* sk_fmmap(SkFILE* f, size_t* length) {
int fileno = sk_fileno(f);
if (fileno < 0) {
return NULL;
}
return sk_fdmmap(fileno, length);
}
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