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file.cpp
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/*
* Copyright (c) 2021, Valtteri Koskivuori <vkoskiv@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Vector.h>
#include <LibCompress/Gzip.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/FileStream.h>
#include <LibCore/MappedFile.h>
#include <LibCore/MimeData.h>
#include <LibCore/System.h>
#include <LibELF/Image.h>
#include <LibELF/Validation.h>
#include <LibGfx/ImageDecoder.h>
#include <LibMain/Main.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
static Optional<String> description_only(String description, [[maybe_unused]] String const& path)
{
return description;
}
// FIXME: Ideally Gfx::ImageDecoder could tell us the image type directly.
static Optional<String> image_details(String const& description, String const& path)
{
auto file_or_error = Core::MappedFile::map(path);
if (file_or_error.is_error())
return {};
auto& mapped_file = *file_or_error.value();
auto image_decoder = Gfx::ImageDecoder::try_create(mapped_file.bytes());
if (!image_decoder)
return {};
return String::formatted("{}, {} x {}", description, image_decoder->width(), image_decoder->height());
}
static Optional<String> gzip_details(String description, String const& path)
{
auto file_or_error = Core::MappedFile::map(path);
if (file_or_error.is_error())
return {};
auto& mapped_file = *file_or_error.value();
if (!Compress::GzipDecompressor::is_likely_compressed(mapped_file.bytes()))
return {};
auto gzip_details = Compress::GzipDecompressor::describe_header(mapped_file.bytes());
if (!gzip_details.has_value())
return {};
return String::formatted("{}, {}", description, gzip_details.value());
}
static Optional<String> elf_details(String description, String const& path)
{
auto file_or_error = Core::MappedFile::map(path);
if (file_or_error.is_error())
return {};
auto& mapped_file = *file_or_error.value();
auto elf_data = mapped_file.bytes();
ELF::Image elf_image(elf_data);
if (!elf_image.is_valid())
return {};
StringBuilder interpreter_path_builder;
auto result_or_error = ELF::validate_program_headers(*(const ElfW(Ehdr)*)elf_data.data(), elf_data.size(), elf_data, &interpreter_path_builder);
if (result_or_error.is_error() || !result_or_error.value())
return {};
auto interpreter_path = interpreter_path_builder.string_view();
auto& header = *reinterpret_cast<const ElfW(Ehdr)*>(elf_data.data());
auto bitness = header.e_ident[EI_CLASS] == ELFCLASS64 ? "64" : "32";
auto byteorder = header.e_ident[EI_DATA] == ELFDATA2LSB ? "LSB" : "MSB";
bool is_dynamically_linked = !interpreter_path.is_empty();
String dynamic_section = String::formatted(", dynamically linked, interpreter {}", interpreter_path);
return String::formatted("{} {}-bit {} {}, {}, version {} ({}){}",
description,
bitness,
byteorder,
ELF::Image::object_file_type_to_string(header.e_type).value_or("(?)"),
ELF::Image::object_machine_type_to_string(header.e_machine).value_or("(?)"),
header.e_ident[EI_ABIVERSION],
ELF::Image::object_abi_type_to_string(header.e_ident[EI_OSABI]).value_or("(?)"),
is_dynamically_linked ? dynamic_section : "");
}
#define ENUMERATE_MIME_TYPE_DESCRIPTIONS \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/gzip", "gzip compressed data", gzip_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/javascript", "JavaScript source", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/json", "JSON data", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/pdf", "PDF document", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/rtf", "Rich text file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/tar", "tape archive", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/wasm", "WebAssembly bytecode", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/x-7z-compressed", "7-Zip archive", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("audio/midi", "MIDI sound", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/blender", "Blender project file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/elf", "ELF", elf_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/ext", "ext filesystem", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/flac", "FLAC audio", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/iso-9660", "ISO 9660 CD/DVD image", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/isz", "Compressed ISO image", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/lua-bytecode", "Lua bytecode", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/matroska", "Matroska container", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/nes-rom", "Nintendo Entertainment System ROM", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/qcow", "qcow file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/raw-zlib", "raw zlib stream", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/sqlite", "sqlite database", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/win-31x-compressed", "Windows 3.1X compressed file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/win-95-compressed", "Windows 95 compressed file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/bmp", "BMP image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/gif", "GIF image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/jpeg", "JPEG image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/png", "PNG image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/x-portable-bitmap", "PBM image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/x-portable-graymap", "PGM image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/x-portable-pixmap", "PPM image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("image/x-qoi", "QOI image data", image_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("text/markdown", "Markdown document", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("text/x-shellscript", "POSIX shell script text executable", description_only)
static Optional<String> get_description_from_mime_type(String const& mime, String const& path)
{
#define __ENUMERATE_MIME_TYPE_DESCRIPTION(mime_type, description, details) \
if (String(mime_type) == mime) \
return details(String(description), path);
ENUMERATE_MIME_TYPE_DESCRIPTIONS;
#undef __ENUMERATE_MIME_TYPE_DESCRIPTION
return {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath"));
Vector<String> paths;
bool flag_mime_only = false;
Core::ArgsParser args_parser;
args_parser.set_general_help("Determine type of files");
args_parser.add_option(flag_mime_only, "Only print mime type", "mime-type", 'I');
args_parser.add_positional_argument(paths, "Files to identify", "files", Core::ArgsParser::Required::Yes);
args_parser.parse(arguments);
bool all_ok = true;
for (auto path : paths) {
auto file_or_error = Core::File::open(path, Core::OpenMode::ReadOnly);
if (file_or_error.is_error()) {
perror(path.characters());
all_ok = false;
continue;
}
auto file = file_or_error.release_value();
struct stat file_stat = TRY(Core::System::lstat(path));
auto file_size_in_bytes = file_stat.st_size;
if (file->is_directory()) {
outln("{}: directory", path);
} else if (!file_size_in_bytes) {
outln("{}: empty", path);
} else {
// Read accounts for longest possible offset + signature we currently match against.
auto bytes = file->read(0x9006);
auto file_name_guess = Core::guess_mime_type_based_on_filename(path);
auto mime_type = Core::guess_mime_type_based_on_sniffed_bytes(bytes.bytes()).value_or(file_name_guess);
auto human_readable_description = get_description_from_mime_type(mime_type, String(path)).value_or(mime_type);
outln("{}: {}", path, flag_mime_only ? mime_type : human_readable_description);
}
}
return all_ok ? 0 : 1;
}