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120 lines
3.7 KiB
C++
120 lines
3.7 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 <unordered_map>
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#include "file_format.hh"
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#include "archive_manager.hh"
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#include "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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static bool
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is_pcap_header(uint8_t* buffer)
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{
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size_t offset = 0;
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if (buffer[0] == 0x0a && buffer[1] == 0x0d && buffer[2] == 0x0d
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&& buffer[3] == 0x0a)
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{
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offset += sizeof(uint32_t) * 2;
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if (buffer[offset + 0] == 0x1a && buffer[offset + 1] == 0x2b
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&& buffer[offset + 2] == 0x3c && buffer[offset + 3] == 0x4d)
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{
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return true;
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}
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if (buffer[offset + 0] == 0x4d && buffer[offset + 1] == 0x3c
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&& buffer[offset + 2] == 0x2b && buffer[offset + 3] == 0x1a)
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{
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return true;
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}
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return false;
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}
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if (buffer[0] == 0xa1 && buffer[1] == 0xb2 && buffer[2] == 0xc3
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&& buffer[3] == 0xd4)
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{
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return true;
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}
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if (buffer[0] == 0xd4 && buffer[1] == 0xc3 && buffer[2] == 0xb2
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&& buffer[3] == 0xa1)
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{
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return true;
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}
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if (buffer[0] == 0xa1 && buffer[1] == 0xb2 && buffer[2] == 0x3c
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&& buffer[3] == 0x4d)
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{
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return true;
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}
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if (buffer[0] == 0x4d && buffer[1] == 0x3c && buffer[2] == 0xb2
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&& buffer[3] == 0xa1)
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{
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return true;
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}
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return false;
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}
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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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if (archive_manager::is_archive(filename)) {
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return file_format_t::FF_ARCHIVE;
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}
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file_format_t retval = file_format_t::FF_UNKNOWN;
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auto_fd fd;
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if ((fd = lnav::filesystem::openp(filename, O_RDONLY)) != -1) {
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uint8_t buffer[32];
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ssize_t rc;
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if ((rc = read(fd, buffer, sizeof(buffer))) > 0) {
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static auto SQLITE3_HEADER = "SQLite format 3";
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auto header_frag = string_fragment(buffer, 0, rc);
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if (header_frag.startswith(SQLITE3_HEADER)) {
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retval = file_format_t::FF_SQLITE_DB;
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} else if (rc > 24 && is_pcap_header(buffer)) {
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retval = file_format_t::FF_PCAP;
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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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