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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 <cstdint>
#include <cstdlib>
#include <iostream>
#include <limits>
std::vector<char> wasm::read_stdin(Flags::DebugOption debug) {
if (debug == Flags::Debug)
std::cerr << "Loading stdin..." << std::endl;
std::vector<char> input;
char c;
while (std::cin.get(c) && !std::cin.eof()) {
input.push_back(c);
}
return input;
}
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;
std::ios_base::openmode 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');
if (size_t(insize) == 0)
return input;
infile.seekg(0);
infile.read(&input[0], insize);
if (binary == Flags::Text) {
size_t chars = size_t(infile.gcount());
// Truncate size to the number of ASCII characters actually read in text
// mode (which is generally less than the number of bytes on Windows, if
// \r\n line endings are present)
input.resize(chars + 1);
input[chars] = '\0';
}
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]() {
if (filename == "-") {
return std::cout.rdbuf();
}
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;
}()) {}
void wasm::copy_file(std::string input, std::string output) {
std::ifstream src(input, std::ios::binary);
std::ofstream dst(output, std::ios::binary);
dst << src.rdbuf();
}
size_t wasm::file_size(std::string filename) {
std::ifstream infile(filename, std::ifstream::ate | std::ifstream::binary);
return infile.tellg();
}
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