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102 lines
4.0 KiB
C++
102 lines
4.0 KiB
C++
/**
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* Copyright (c) 2020, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file file_format.hh
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*/
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#include "file_format.hh"
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#include "archive_manager.hh"
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#include "base/auto_fd.hh"
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#include "base/fs_util.hh"
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#include "base/intern_string.hh"
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#include "base/lnav_log.hh"
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#include "config.h"
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#include "line_buffer.hh"
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file_format_t
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detect_file_format(const ghc::filesystem::path& filename)
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{
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auto describe_res = archive_manager::describe(filename);
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if (describe_res.isOk()
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&& describe_res.unwrap().is<archive_manager::archive_info>())
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{
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return file_format_t::ARCHIVE;
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}
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file_format_t retval = file_format_t::UNKNOWN;
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auto open_res = lnav::filesystem::open_file(filename, O_RDONLY);
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if (open_res.isErr()) {
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log_error("unable to open file for format detection: %s -- %s",
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filename.c_str(),
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open_res.unwrapErr().c_str());
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} else {
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auto fd = open_res.unwrap();
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uint8_t buffer[32];
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auto rc = read(fd, buffer, sizeof(buffer));
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if (rc < 0) {
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log_error("unable to read file for format detection: %s -- %s",
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filename.c_str(),
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strerror(errno));
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} else {
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static auto SQLITE3_HEADER = "SQLite format 3";
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auto header_frag = string_fragment::from_bytes(buffer, rc);
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if (header_frag.startswith(SQLITE3_HEADER)) {
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log_info("%s: appears to be a SQLite DB", filename.c_str());
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retval = file_format_t::SQLITE_DB;
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} else {
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file_range next_range;
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line_buffer lb;
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lb.set_fd(fd);
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auto load_res = lb.load_next_line(next_range);
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if (load_res.isOk() && lb.is_header_utf8() && !lb.is_piper()) {
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auto li = load_res.unwrap();
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auto read_res = lb.read_range(li.li_file_range);
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if (read_res.isOk()) {
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auto sbr = read_res.unwrap();
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auto demux_id_opt = lnav::piper::multiplex_id_for_line(
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sbr.to_string_fragment());
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if (demux_id_opt) {
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log_info("%s: is multiplexed using %s",
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filename.c_str(),
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demux_id_opt.value().c_str());
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return file_format_t::MULTIPLEXED;
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}
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}
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}
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}
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}
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}
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return retval;
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}
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