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5096f9cff5
I like using hexdump to 'have a look' at binary files, for example /dev/random or /dev/hda. Obviously, this usecase requires that hexdump tries not to buffer the 'entire' device.
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Array.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <ctype.h>
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static constexpr size_t LINE_LENGTH_BYTES = 16;
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int main(int argc, char** argv)
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{
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Core::ArgsParser args_parser;
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const char* path = nullptr;
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args_parser.add_positional_argument(path, "Input", "input", Core::ArgsParser::Required::No);
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args_parser.parse(argc, argv);
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RefPtr<Core::File> file;
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if (!path) {
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file = Core::File::standard_input();
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} else {
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auto file_or_error = Core::File::open(path, Core::OpenMode::ReadOnly);
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if (file_or_error.is_error()) {
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warnln("Failed to open {}: {}", path, file_or_error.error());
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return 1;
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}
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file = file_or_error.value();
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}
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auto print_line = [](u8* buf, size_t size) {
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VERIFY(size <= LINE_LENGTH_BYTES);
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for (size_t i = 0; i < LINE_LENGTH_BYTES; ++i) {
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if (i < size)
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out("{:02x} ", buf[i]);
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else
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out(" ");
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if (i == 7)
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out(" ");
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}
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out(" |");
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for (size_t i = 0; i < size; ++i) {
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if (isprint(buf[i]))
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putchar(buf[i]);
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else
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putchar('.');
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}
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putchar('|');
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putchar('\n');
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};
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Array<u8, BUFSIZ> contents;
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static_assert(LINE_LENGTH_BYTES * 2 <= contents.size(), "Buffer is too small?!");
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size_t contents_size = 0;
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int nread;
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do {
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nread = file->read(&contents[contents_size], BUFSIZ - contents_size);
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contents_size += nread;
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// Print as many complete lines as we can (possibly none).
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size_t offset;
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for (offset = 0; offset + LINE_LENGTH_BYTES - 1 < contents_size; offset += LINE_LENGTH_BYTES) {
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print_line(&contents[offset], LINE_LENGTH_BYTES);
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}
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contents_size -= offset;
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// Regions cannot overlap due to above static_assert.
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memcpy(&contents[0], &contents[offset], contents_size);
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} while (nread);
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VERIFY(contents_size <= LINE_LENGTH_BYTES - 1);
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if (contents_size > 0)
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print_line(&contents[0], contents_size);
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return 0;
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}
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