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/**
* Copyright (c) 2023, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "piper.file.hh"
#include <arpa/inet.h>
#include <unistd.h>
#include "base/lnav_log.hh"
#include "base/paths.hh"
namespace lnav {
namespace piper {
const char HEADER_MAGIC[4] = {'L', 0, 'N', 1};
const ghc::filesystem::path&
storage_path()
{
static auto INSTANCE = lnav::paths::workdir() / "piper";
return INSTANCE;
}
nonstd::optional<auto_buffer>
read_header(int fd, const char* first8)
{
if (memcmp(first8, HEADER_MAGIC, sizeof(HEADER_MAGIC)) != 0) {
log_trace("first 4 bytes are not a piper header: %02x%02x%02x%02x",
first8[0],
first8[1],
first8[2],
first8[3]);
return nonstd::nullopt;
}
uint32_t meta_size = ntohl(*((uint32_t*) &first8[4]));
auto meta_buf = auto_buffer::alloc(meta_size);
if (meta_buf.in() == nullptr) {
log_error("failed to alloc %d bytes for header", meta_size);
return nonstd::nullopt;
}
auto meta_prc = pread(fd, meta_buf.in(), meta_size, 8);
if (meta_prc != meta_size) {
log_error("failed to read piper header: %s", strerror(errno));
return nonstd::nullopt;
}
meta_buf.resize(meta_size);
return meta_buf;
}
} // namespace piper
} // namespace lnav
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