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loader.cc
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loader.cc
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// Copyright (c) 2013 Austin T. Clements. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
#include <stdio.h>
#include <stdlib.h>
#include <system_error>
#include "elf++.hh"
using namespace std;
ELFPP_BEGIN_NAMESPACE
class file_loader : public loader {
void *base = nullptr;
size_t lim;
public:
file_loader(const std::string &fname) {
FILE *file = fopen(fname.c_str(), "rb");
if (!file) throw system_error(errno, system_category(), "opening file");
fseek(file, 0, SEEK_END);
off_t end = ftell(file);
fseek(file, 0, SEEK_SET);
if (end == (off_t)-1) throw system_error(errno, system_category(), "finding file length");
lim = end;
base = malloc(end);
size_t r = fread(base, 1, end, file);
if (r != end) throw system_error(errno, system_category(), "reading");
fclose(file);
}
~file_loader() { free(base); }
const void *load(off_t offset, size_t size) {
if (offset + size > lim) throw range_error("offset exceeds file size");
return (const char *)base + offset;
}
};
std::shared_ptr<loader> create_file_loader(const std::string &fname) { return make_shared<file_loader>(fname); }
ELFPP_END_NAMESPACE