mirror of https://github.com/tstack/lnav
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
/**
|
|
* Copyright (c) 2021, 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.
|
|
*
|
|
* @file lnav.gzip.cc
|
|
*/
|
|
|
|
#include "lnav.gzip.hh"
|
|
|
|
#include <zlib.h>
|
|
|
|
#include "config.h"
|
|
#include "fmt/format.h"
|
|
|
|
namespace lnav {
|
|
namespace gzip {
|
|
|
|
bool
|
|
is_gzipped(const char* buffer, size_t len)
|
|
{
|
|
return len > 2 && buffer[0] == '\037' && buffer[1] == '\213';
|
|
}
|
|
|
|
Result<auto_buffer, std::string>
|
|
compress(const void* input, size_t len)
|
|
{
|
|
auto retval = auto_buffer::alloc(len + 4096);
|
|
|
|
z_stream zs;
|
|
zs.zalloc = Z_NULL;
|
|
zs.zfree = Z_NULL;
|
|
zs.opaque = Z_NULL;
|
|
zs.avail_in = (uInt) len;
|
|
zs.next_in = (Bytef*) input;
|
|
zs.avail_out = (uInt) retval.size();
|
|
zs.next_out = (Bytef*) retval.in();
|
|
|
|
auto rc = deflateInit2(
|
|
&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 | 16, 8, Z_DEFAULT_STRATEGY);
|
|
if (rc != Z_OK) {
|
|
return Err(
|
|
fmt::format("unable to initialize compressor -- {}", zError(rc)));
|
|
}
|
|
rc = deflate(&zs, Z_FINISH);
|
|
if (rc != Z_STREAM_END) {
|
|
return Err(fmt::format("unable to compress data -- {}", zError(rc)));
|
|
}
|
|
rc = deflateEnd(&zs);
|
|
if (rc != Z_OK) {
|
|
return Err(
|
|
fmt::format("unable to finalize compression -- {}", zError(rc)));
|
|
}
|
|
return Ok(std::move(retval.shrink_to(zs.total_out)));
|
|
}
|
|
|
|
Result<auto_buffer, std::string>
|
|
uncompress(const std::string& src, const void* buffer, size_t size)
|
|
{
|
|
auto uncomp = auto_buffer::alloc(size * 2);
|
|
z_stream strm;
|
|
int err;
|
|
|
|
strm.next_in = (Bytef*) buffer;
|
|
strm.avail_in = size;
|
|
strm.total_out = 0;
|
|
strm.zalloc = Z_NULL;
|
|
strm.zfree = Z_NULL;
|
|
|
|
if ((err = inflateInit2(&strm, (16 + MAX_WBITS))) != Z_OK) {
|
|
return Err(fmt::format("invalid gzip data: {} -- {}",
|
|
src,
|
|
strm.msg ? strm.msg : zError(err)));
|
|
}
|
|
|
|
bool done = false;
|
|
|
|
while (!done) {
|
|
if (strm.total_out >= uncomp.size()) {
|
|
uncomp.expand_by(size / 2);
|
|
}
|
|
|
|
strm.next_out = (Bytef*) (uncomp.in() + strm.total_out);
|
|
strm.avail_out = uncomp.size() - strm.total_out;
|
|
|
|
// Inflate another chunk.
|
|
err = inflate(&strm, Z_SYNC_FLUSH);
|
|
if (err == Z_STREAM_END) {
|
|
done = true;
|
|
} else if (err != Z_OK) {
|
|
inflateEnd(&strm);
|
|
return Err(fmt::format("unable to uncompress: {} -- {}",
|
|
src,
|
|
strm.msg ? strm.msg : zError(err)));
|
|
}
|
|
}
|
|
|
|
if (inflateEnd(&strm) != Z_OK) {
|
|
return Err(fmt::format("unable to uncompress: {} -- {}",
|
|
src,
|
|
strm.msg ? strm.msg : zError(err)));
|
|
}
|
|
|
|
return Ok(std::move(uncomp.shrink_to(strm.total_out)));
|
|
}
|
|
|
|
} // namespace gzip
|
|
} // namespace lnav
|