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82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
/**
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* Copyright (c) 2023, 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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#include "piper.file.hh"
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#include <arpa/inet.h>
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#include <unistd.h>
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#include "base/lnav_log.hh"
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#include "base/paths.hh"
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namespace lnav {
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namespace piper {
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const char HEADER_MAGIC[4] = {'L', 0, 'N', 1};
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const ghc::filesystem::path&
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storage_path()
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{
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static auto INSTANCE = lnav::paths::workdir() / "piper";
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return INSTANCE;
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}
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nonstd::optional<auto_buffer>
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read_header(int fd, const char* first8)
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{
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if (memcmp(first8, HEADER_MAGIC, sizeof(HEADER_MAGIC)) != 0) {
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log_trace("first 4 bytes are not a piper header: %02x%02x%02x%02x",
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first8[0],
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first8[1],
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first8[2],
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first8[3]);
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return nonstd::nullopt;
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}
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uint32_t meta_size = ntohl(*((uint32_t*) &first8[4]));
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auto meta_buf = auto_buffer::alloc(meta_size);
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if (meta_buf.in() == nullptr) {
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log_error("failed to alloc %d bytes for header", meta_size);
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return nonstd::nullopt;
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}
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auto meta_prc = pread(fd, meta_buf.in(), meta_size, 8);
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if (meta_prc != meta_size) {
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log_error("failed to read piper header: %s", strerror(errno));
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return nonstd::nullopt;
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}
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meta_buf.resize(meta_size);
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return meta_buf;
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}
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} // namespace piper
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} // namespace lnav
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