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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteString.h>
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#include <AK/StringUtils.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static bool try_set_offset_and_length_parameters(ByteString const& arg_offset, ByteString const& arg_length, u64& offset, u64& length)
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{
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// TODO: Add support for hex values
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auto possible_offset = arg_offset.to_number<u64>();
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if (!possible_offset.has_value())
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return false;
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auto possible_length = arg_length.to_number<u64>();
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if (!possible_length.has_value())
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return false;
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offset = possible_offset.value();
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length = possible_length.value();
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return true;
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}
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static void try_to_dump_with_memory_mapping(int fd, u64 offset, u64 length)
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{
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VERIFY(fd >= 0);
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u64 mmoffset = offset % sysconf(_SC_PAGESIZE);
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void* mmp = mmap(NULL, mmoffset + length, PROT_READ, MAP_SHARED, fd, offset - mmoffset);
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if (mmp == MAP_FAILED) {
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perror("mmap");
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return;
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}
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size_t ncomplete = 0;
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while (ncomplete < length) {
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ssize_t nwritten = write(STDOUT_FILENO, static_cast<u8*>(mmp) + ncomplete, length - ncomplete);
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if (nwritten < 0) {
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perror("write");
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return;
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}
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ncomplete += nwritten;
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}
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if (munmap(mmp, mmoffset + length) < 0) {
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perror("munmap");
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}
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}
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static void try_to_dump_with_read(int fd, u64 offset, u64 length)
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{
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VERIFY(fd >= 0);
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auto rs = lseek(fd, offset, SEEK_SET);
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if (rs < 0) {
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fprintf(stderr, "Couldn't seek to offset %" PRIi64 " while verifying: %s\n", offset, strerror(errno));
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return;
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}
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u8 buf[4096];
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size_t ncomplete = 0;
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while (ncomplete < length) {
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size_t length_to_be_read = min<size_t>((length - ncomplete), sizeof(buf));
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if (read(fd, buf, length_to_be_read) < 0) {
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perror("read");
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return;
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}
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ssize_t nwritten = write(STDOUT_FILENO, buf, length_to_be_read);
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if (nwritten < 0) {
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perror("write");
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return;
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}
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ncomplete += nwritten;
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}
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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StringView arg_offset;
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StringView arg_length;
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bool use_read_instead_of_mmap = false;
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Core::ArgsParser args;
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args.add_positional_argument(arg_offset, "Physical Address (Offset)", "offset", Core::ArgsParser::Required::Yes);
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args.add_positional_argument(arg_length, "Length of that region", "length", Core::ArgsParser::Required::Yes);
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args.add_option(use_read_instead_of_mmap, "Read /dev/mem instead of try to map it", nullptr, 'r');
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args.parse(arguments);
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u64 offset = 0;
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u64 length = 0;
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if (!try_set_offset_and_length_parameters(arg_offset, arg_length, offset, length)) {
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warnln("pmemdump: Invalid length or offset parameters\n");
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return 1;
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}
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int fd = open("/dev/mem", O_RDONLY);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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if (use_read_instead_of_mmap)
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try_to_dump_with_read(fd, offset, length);
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else
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try_to_dump_with_memory_mapping(fd, offset, length);
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close(fd);
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return 0;
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}
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