The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/ports/SkOSFile_win.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,111 @@
     1.4 +/*
     1.5 + * Copyright 2013 Google Inc.
     1.6 + *
     1.7 + * Use of this source code is governed by a BSD-style license that can be
     1.8 + * found in the LICENSE file.
     1.9 + */
    1.10 +
    1.11 +#include "SkOSFile.h"
    1.12 +
    1.13 +#include "SkTFitsIn.h"
    1.14 +
    1.15 +#include <io.h>
    1.16 +#include <stdio.h>
    1.17 +#include <sys/stat.h>
    1.18 +
    1.19 +typedef struct {
    1.20 +    ULONGLONG fVolume;
    1.21 +    ULONGLONG fLsbSize;
    1.22 +    ULONGLONG fMsbSize;
    1.23 +} SkFILEID;
    1.24 +
    1.25 +static bool sk_ino(SkFILE* f, SkFILEID* id) {
    1.26 +    int fileno = _fileno((FILE*)f);
    1.27 +    if (fileno < 0) {
    1.28 +        return false;
    1.29 +    }
    1.30 +
    1.31 +    HANDLE file = (HANDLE)_get_osfhandle(fileno);
    1.32 +    if (INVALID_HANDLE_VALUE == file) {
    1.33 +        return false;
    1.34 +    }
    1.35 +
    1.36 +    //TODO: call GetFileInformationByHandleEx on Vista and later with FileIdInfo.
    1.37 +    BY_HANDLE_FILE_INFORMATION info;
    1.38 +    if (0 == GetFileInformationByHandle(file, &info)) {
    1.39 +        return false;
    1.40 +    }
    1.41 +    id->fVolume = info.dwVolumeSerialNumber;
    1.42 +    id->fLsbSize = info.nFileIndexLow + (((ULONGLONG)info.nFileIndexHigh) << 32);
    1.43 +    id->fMsbSize = 0;
    1.44 +
    1.45 +    return true;
    1.46 +}
    1.47 +
    1.48 +bool sk_fidentical(SkFILE* a, SkFILE* b) {
    1.49 +    SkFILEID aID, bID;
    1.50 +    return sk_ino(a, &aID) && sk_ino(b, &bID)
    1.51 +           && aID.fLsbSize == bID.fLsbSize
    1.52 +           && aID.fMsbSize == bID.fMsbSize
    1.53 +           && aID.fVolume == bID.fVolume;
    1.54 +}
    1.55 +
    1.56 +class SkAutoNullKernelHandle : SkNoncopyable {
    1.57 +public:
    1.58 +    SkAutoNullKernelHandle(const HANDLE handle) : fHandle(handle) { }
    1.59 +    ~SkAutoNullKernelHandle() { CloseHandle(fHandle); }
    1.60 +    operator HANDLE() const { return fHandle; }
    1.61 +    bool isValid() const { return NULL != fHandle; }
    1.62 +private:
    1.63 +    HANDLE fHandle;
    1.64 +};
    1.65 +typedef SkAutoNullKernelHandle SkAutoWinMMap;
    1.66 +
    1.67 +void sk_fmunmap(const void* addr, size_t) {
    1.68 +    UnmapViewOfFile(addr);
    1.69 +}
    1.70 +
    1.71 +void* sk_fdmmap(int fileno, size_t* length) {
    1.72 +    HANDLE file = (HANDLE)_get_osfhandle(fileno);
    1.73 +    if (INVALID_HANDLE_VALUE == file) {
    1.74 +        return NULL;
    1.75 +    }
    1.76 +
    1.77 +    LARGE_INTEGER fileSize;
    1.78 +    if (0 == GetFileSizeEx(file, &fileSize)) {
    1.79 +        //TODO: use SK_TRACEHR(GetLastError(), "Could not get file size.") to report.
    1.80 +        return NULL;
    1.81 +    }
    1.82 +    if (!SkTFitsIn<size_t>(fileSize.QuadPart)) {
    1.83 +        return NULL;
    1.84 +    }
    1.85 +
    1.86 +    SkAutoWinMMap mmap(CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL));
    1.87 +    if (!mmap.isValid()) {
    1.88 +        //TODO: use SK_TRACEHR(GetLastError(), "Could not create file mapping.") to report.
    1.89 +        return NULL;
    1.90 +    }
    1.91 +
    1.92 +    // Eventually call UnmapViewOfFile
    1.93 +    void* addr = MapViewOfFile(mmap, FILE_MAP_READ, 0, 0, 0);
    1.94 +    if (NULL == addr) {
    1.95 +        //TODO: use SK_TRACEHR(GetLastError(), "Could not map view of file.") to report.
    1.96 +        return NULL;
    1.97 +    }
    1.98 +
    1.99 +    *length = static_cast<size_t>(fileSize.QuadPart);
   1.100 +    return addr;
   1.101 +}
   1.102 +
   1.103 +int sk_fileno(SkFILE* f) {
   1.104 +    return _fileno((FILE*)f);
   1.105 +}
   1.106 +
   1.107 +void* sk_fmmap(SkFILE* f, size_t* length) {
   1.108 +    int fileno = sk_fileno(f);
   1.109 +    if (fileno < 0) {
   1.110 +        return NULL;
   1.111 +    }
   1.112 +
   1.113 +    return sk_fdmmap(fileno, length);
   1.114 +}