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// Copyright (c) 2012 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 "base/json/json_file_value_serializer.h"
#include "base/file_util.h"
#include "base/json/json_string_value_serializer.h"
#include "base/logging.h"
using base::FilePath;
const char* JSONFileValueSerializer::kAccessDenied = "Access denied.";
const char* JSONFileValueSerializer::kCannotReadFile = "Can't read file.";
const char* JSONFileValueSerializer::kFileLocked = "File locked.";
const char* JSONFileValueSerializer::kNoSuchFile = "File doesn't exist.";
bool JSONFileValueSerializer::Serialize(const base::Value& root) {
return SerializeInternal(root, false);
}
bool JSONFileValueSerializer::SerializeAndOmitBinaryValues(
const base::Value& root) {
return SerializeInternal(root, true);
}
bool JSONFileValueSerializer::SerializeInternal(const base::Value& root,
bool omit_binary_values) {
std::string json_string;
JSONStringValueSerializer serializer(&json_string);
serializer.set_pretty_print(true);
bool result = omit_binary_values ?
serializer.SerializeAndOmitBinaryValues(root) :
serializer.Serialize(root);
if (!result)
return false;
int data_size = static_cast<int>(json_string.size());
if (base::WriteFile(json_file_path_, json_string.data(), data_size) !=
data_size)
return false;
return true;
}
int JSONFileValueSerializer::ReadFileToString(std::string* json_string) {
DCHECK(json_string);
if (!base::ReadFileToString(json_file_path_, json_string)) {
#if defined(OS_WIN)
int error = ::GetLastError();
if (error == ERROR_SHARING_VIOLATION || error == ERROR_LOCK_VIOLATION) {
return JSON_FILE_LOCKED;
} else if (error == ERROR_ACCESS_DENIED) {
return JSON_ACCESS_DENIED;
}
#endif
if (!base::PathExists(json_file_path_))
return JSON_NO_SUCH_FILE;
else
return JSON_CANNOT_READ_FILE;
}
return JSON_NO_ERROR;
}
const char* JSONFileValueSerializer::GetErrorMessageForCode(int error_code) {
switch (error_code) {
case JSON_NO_ERROR:
return "";
case JSON_ACCESS_DENIED:
return kAccessDenied;
case JSON_CANNOT_READ_FILE:
return kCannotReadFile;
case JSON_FILE_LOCKED:
return kFileLocked;
case JSON_NO_SUCH_FILE:
return kNoSuchFile;
default:
NOTREACHED();
return "";
}
}
base::Value* JSONFileValueSerializer::Deserialize(int* error_code,
std::string* error_str) {
std::string json_string;
int error = ReadFileToString(&json_string);
if (error != JSON_NO_ERROR) {
if (error_code)
*error_code = error;
if (error_str)
*error_str = GetErrorMessageForCode(error);
return NULL;
}
JSONStringValueSerializer serializer(json_string);
serializer.set_allow_trailing_comma(allow_trailing_comma_);
return serializer.Deserialize(error_code, error_str);
}
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