1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* 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;
}
|
