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/*
* Copyright 2015 WebAssembly Community Group participants
*
* 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 "support/file.h"
#include <cstdlib>
#include <limits>
template <typename T>
T wasm::read_file(const std::string &filename, Flags::BinaryOption binary, Flags::DebugOption debug) {
if (debug == Flags::Debug) std::cerr << "Loading '" << filename << "'..." << std::endl;
std::ifstream infile;
auto flags = std::ifstream::in;
if (binary == Flags::Binary) flags |= std::ifstream::binary;
infile.open(filename, flags);
if (!infile.is_open()) {
std::cerr << "Failed opening '" << filename << "'" << std::endl;
exit(EXIT_FAILURE);
}
infile.seekg(0, std::ios::end);
std::streampos insize = infile.tellg();
if (uint64_t(insize) >= std::numeric_limits<size_t>::max()) {
// Building a 32-bit executable where size_t == 32 bits, we are not able to create strings larger than 2^32 bytes in length, so must abort here.
std::cerr << "Failed opening '" << filename << "': Input file too large: " << insize << " bytes. Try rebuilding in 64-bit mode." << std::endl;
exit(EXIT_FAILURE);
}
T input(size_t(insize) + (binary == Flags::Binary ? 0 : 1), '\0');
infile.seekg(0);
infile.read(&input[0], insize);
return input;
}
// Explicit instantiations for the explicit specializations.
template std::string wasm::read_file<>(const std::string &, Flags::BinaryOption, Flags::DebugOption);
template std::vector<char> wasm::read_file<>(const std::string &, Flags::BinaryOption, Flags::DebugOption);
wasm::Output::Output(const std::string &filename, Flags::BinaryOption binary, Flags::DebugOption debug)
: outfile(), out([this, filename, binary, debug]() {
std::streambuf *buffer;
if (filename.size()) {
if (debug == Flags::Debug) std::cerr << "Opening '" << filename << std::endl;
auto flags = std::ofstream::out | std::ofstream::trunc;
if (binary == Flags::Binary) flags |= std::ofstream::binary;
outfile.open(filename, flags);
if (!outfile.is_open()) {
std::cerr << "Failed opening '" << filename << "'" << std::endl;
exit(EXIT_FAILURE);
}
buffer = outfile.rdbuf();
} else {
buffer = std::cout.rdbuf();
}
return buffer;
}()) {}
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