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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/fileapi/quota_file_util.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "webkit/fileapi/file_system_context.h"
#include "webkit/fileapi/file_system_operation_context.h"
#include "webkit/fileapi/file_system_path_manager.h"
#include "webkit/fileapi/file_system_usage_cache.h"
namespace fileapi {
const int64 QuotaFileUtil::kNoLimit = kint64max;
namespace {
// Checks if copying in the same filesystem can be performed.
// This method is not called for moving within a single filesystem.
static bool CanCopy(
const FilePath& src_file_path,
const FilePath& dest_file_path,
int64 allowed_bytes_growth,
int64* growth) {
base::PlatformFileInfo src_file_info;
if (!file_util::GetFileInfo(src_file_path, &src_file_info)) {
// Falling through to the actual copy/move operation.
return true;
}
base::PlatformFileInfo dest_file_info;
if (!file_util::GetFileInfo(dest_file_path, &dest_file_info))
dest_file_info.size = 0;
if (allowed_bytes_growth != QuotaFileUtil::kNoLimit &&
src_file_info.size - dest_file_info.size > allowed_bytes_growth)
return false;
if (growth != NULL)
*growth = src_file_info.size - dest_file_info.size;
return true;
}
static FilePath InitUsageFile(FileSystemOperationContext* fs_context) {
FilePath base_path = fs_context->file_system_context()->path_manager()->
ValidateFileSystemRootAndGetPathOnFileThread(fs_context->src_origin_url(),
fs_context->src_type(), FilePath(), false);
FilePath usage_file_path =
base_path.AppendASCII(FileSystemUsageCache::kUsageFileName);
if (FileSystemUsageCache::Exists(usage_file_path))
FileSystemUsageCache::IncrementDirty(usage_file_path);
return usage_file_path;
}
static void UpdateUsageFile(const FilePath& usage_file_path, int64 growth) {
if (FileSystemUsageCache::Exists(usage_file_path))
FileSystemUsageCache::DecrementDirty(usage_file_path);
int64 usage = FileSystemUsageCache::GetUsage(usage_file_path);
if (usage >= 0)
FileSystemUsageCache::UpdateUsage(usage_file_path, usage + growth);
}
} // namespace (anonymous)
// static
QuotaFileUtil* QuotaFileUtil::GetInstance() {
return Singleton<QuotaFileUtil>::get();
}
base::PlatformFileError QuotaFileUtil::CopyOrMoveFile(
FileSystemOperationContext* fs_context,
const FilePath& src_file_path,
const FilePath& dest_file_path,
bool copy) {
FilePath usage_file_path = InitUsageFile(fs_context);
int64 growth = 0;
// It assumes copy/move operations are always in the same fs currently.
// TODO(dmikurube): Do quota check if moving between different fs.
if (copy) {
int64 allowed_bytes_growth = fs_context->allowed_bytes_growth();
// The third argument (growth) is not used for now.
if (!CanCopy(src_file_path, dest_file_path, allowed_bytes_growth,
&growth)) {
FileSystemUsageCache::DecrementDirty(usage_file_path);
return base::PLATFORM_FILE_ERROR_NO_SPACE;
}
} else {
base::PlatformFileInfo dest_file_info;
if (!file_util::GetFileInfo(dest_file_path, &dest_file_info))
dest_file_info.size = 0;
growth = -dest_file_info.size;
}
base::PlatformFileError error = FileSystemFileUtil::GetInstance()->
CopyOrMoveFile(fs_context, src_file_path, dest_file_path, copy);
UpdateUsageFile(usage_file_path, growth);
return error;
}
base::PlatformFileError QuotaFileUtil::DeleteFile(
FileSystemOperationContext* fs_context,
const FilePath& file_path) {
FilePath usage_file_path = InitUsageFile(fs_context);
int64 growth = 0;
base::PlatformFileInfo file_info;
if (!file_util::GetFileInfo(file_path, &file_info))
file_info.size = 0;
growth = -file_info.size;
base::PlatformFileError error = FileSystemFileUtil::GetInstance()->
DeleteFile(fs_context, file_path);
UpdateUsageFile(usage_file_path, growth);
return error;
}
base::PlatformFileError QuotaFileUtil::Truncate(
FileSystemOperationContext* fs_context,
const FilePath& path,
int64 length) {
int64 allowed_bytes_growth = fs_context->allowed_bytes_growth();
FilePath usage_file_path = InitUsageFile(fs_context);
int64 growth = 0;
base::PlatformFileInfo file_info;
if (!file_util::GetFileInfo(path, &file_info)) {
FileSystemUsageCache::DecrementDirty(usage_file_path);
return base::PLATFORM_FILE_ERROR_FAILED;
}
growth = length - file_info.size;
if (allowed_bytes_growth != kNoLimit) {
if (growth > allowed_bytes_growth) {
FileSystemUsageCache::DecrementDirty(usage_file_path);
return base::PLATFORM_FILE_ERROR_NO_SPACE;
}
}
base::PlatformFileError error = FileSystemFileUtil::GetInstance()->Truncate(
fs_context, path, length);
UpdateUsageFile(usage_file_path, growth);
return error;
}
} // namespace fileapi
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