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/*
* Copyright 2016 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "flatbuffers/util.h"
namespace flatbuffers {
bool FileExistsRaw(const char *name) {
std::ifstream ifs(name);
return ifs.good();
}
bool LoadFileRaw(const char *name, bool binary, std::string *buf) {
if (DirExists(name)) return false;
std::ifstream ifs(name, binary ? std::ifstream::binary : std::ifstream::in);
if (!ifs.is_open()) return false;
if (binary) {
// The fastest way to read a file into a string.
ifs.seekg(0, std::ios::end);
auto size = ifs.tellg();
(*buf).resize(static_cast<size_t>(size));
ifs.seekg(0, std::ios::beg);
ifs.read(&(*buf)[0], (*buf).size());
} else {
// This is slower, but works correctly on all platforms for text files.
std::ostringstream oss;
oss << ifs.rdbuf();
*buf = oss.str();
}
return !ifs.bad();
}
static LoadFileFunction g_load_file_function = LoadFileRaw;
static FileExistsFunction g_file_exists_function = FileExistsRaw;
bool LoadFile(const char *name, bool binary, std::string *buf) {
assert(g_load_file_function);
return g_load_file_function(name, binary, buf);
}
bool FileExists(const char *name) {
assert(g_file_exists_function);
return g_file_exists_function(name);
}
bool DirExists(const char *name) {
#ifdef _WIN32
#define flatbuffers_stat _stat
#define FLATBUFFERS_S_IFDIR _S_IFDIR
#else
#define flatbuffers_stat stat
#define FLATBUFFERS_S_IFDIR S_IFDIR
#endif
struct flatbuffers_stat file_info;
if (flatbuffers_stat(name, &file_info) != 0) return false;
return (file_info.st_mode & FLATBUFFERS_S_IFDIR) != 0;
}
LoadFileFunction SetLoadFileFunction(LoadFileFunction load_file_function) {
LoadFileFunction previous_function = g_load_file_function;
g_load_file_function = load_file_function ? load_file_function : LoadFileRaw;
return previous_function;
}
FileExistsFunction SetFileExistsFunction(
FileExistsFunction file_exists_function) {
FileExistsFunction previous_function = g_file_exists_function;
g_file_exists_function = file_exists_function ?
file_exists_function : FileExistsRaw;
return previous_function;
}
} // namespace flatbuffers
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