base/diskcache_win32.cc

/*
 * libjingle
 * Copyright 2006, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 */

#include "talk/base/win32.h"
#include <shellapi.h>
#include <shlobj.h>
#include <tchar.h>

#include <time.h>

#include "talk/base/common.h"
#include "talk/base/diskcache.h"
#include "talk/base/pathutils.h"
#include "talk/base/stream.h"
#include "talk/base/stringencode.h"
#include "talk/base/stringutils.h"

#include "talk/base/diskcache_win32.h"

namespace talk_base {

bool DiskCacheWin32::InitializeEntries() {
  // Note: We could store the cache information in a separate file, for faster
  // initialization.  Figuring it out empirically works, too.

  std::wstring path16 = ToUtf16(folder_);
  path16.append(1, '*');

  WIN32_FIND_DATA find_data;
  HANDLE find_handle = FindFirstFile(path16.c_str(), &find_data);
  if (find_handle != INVALID_HANDLE_VALUE) {
    do {
      size_t index;
      std::string id;
      if (!FilenameToId(ToUtf8(find_data.cFileName), &id, &index))
        continue;

      Entry* entry = GetOrCreateEntry(id, true);
      entry->size += find_data.nFileSizeLow;
      total_size_ += find_data.nFileSizeLow;
      entry->streams = _max(entry->streams, index + 1);
      FileTimeToUnixTime(find_data.ftLastWriteTime, &entry->last_modified);

    } while (FindNextFile(find_handle, &find_data));

    FindClose(find_handle);
  }

  return true;
}

bool DiskCacheWin32::PurgeFiles() {
  std::wstring path16 = ToUtf16(folder_);
  path16.append(1, '*');
  path16.append(1, '\0');

  SHFILEOPSTRUCT file_op = { 0 };
  file_op.wFunc = FO_DELETE;
  file_op.pFrom = path16.c_str();
  file_op.fFlags = FOF_NOCONFIRMATION | FOF_NOERRORUI | FOF_SILENT
                   | FOF_NORECURSION | FOF_FILESONLY;
  if (0 != SHFileOperation(&file_op)) {
    LOG_F(LS_ERROR) << "Couldn't delete cache files";
    return false;
  }

  return true;
}

bool DiskCacheWin32::FileExists(const std::string& filename) const {
  DWORD result = ::GetFileAttributes(ToUtf16(filename).c_str());
  return (INVALID_FILE_ATTRIBUTES != result);
}

bool DiskCacheWin32::DeleteFile(const std::string& filename) const {
  return ::DeleteFile(ToUtf16(filename).c_str()) != 0;
}

}