68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
/*
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* \brief Utility for loading a file
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* \author Norman Feske
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* \date 2014-08-14
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/log.h>
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/* gems includes */
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#include <gems/file.h>
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/* libc includes */
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#include <libc/component.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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static Genode::size_t file_size(char const *name)
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{
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struct stat s;
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s.st_size = 0;
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Libc::with_libc([&] () { stat(name, &s); });
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return s.st_size;
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}
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File::File(char const *name, Genode::Allocator &alloc)
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:
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_alloc(alloc),
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_file_size(file_size(name)),
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_data(alloc.alloc(_file_size))
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{
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Libc::with_libc([&] () {
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int const fd = open(name, O_RDONLY);
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Genode::size_t remain = _file_size;
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char *data = (char *)_data;
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do {
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int ret;
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if ((ret = read(fd, data, remain)) < 0) {
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Genode::error("reading from file \"", name, "\" failed (error ", errno, ")");
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throw Reading_failed();
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}
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remain -= ret;
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data += ret;
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} while (remain > 0);
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close(fd);
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});
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}
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File::~File()
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{
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_alloc.free(_data, _file_size);
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}
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