mirror of https://github.com/tstack/lnav.git
96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
/**
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* Copyright (c) 2021, 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 ON
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* 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 lnav.gzip.cc
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*/
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#include "config.h"
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#include <zlib.h>
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#include "fmt/format.h"
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#include "lnav.gzip.hh"
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namespace lnav {
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namespace gzip {
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bool is_gzipped(const char *buffer, size_t len)
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{
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return len > 2 && buffer[0] == '\037' && buffer[1] == '\213';
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}
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Result<auto_buffer, std::string> uncompress(const std::string& src,
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const void *buffer,
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size_t size)
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{
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auto uncomp = auto_buffer::alloc(size * 2);
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z_stream strm;
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int err;
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strm.next_in = (Bytef *) buffer;
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strm.avail_in = size;
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strm.total_out = 0;
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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if ((err = inflateInit2(&strm, (16 + MAX_WBITS))) != Z_OK) {
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return Err(fmt::format("invalid gzip data: {} -- {}",
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src, strm.msg ? strm.msg : zError(err)));
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}
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bool done = false;
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while (!done) {
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if (strm.total_out >= uncomp.size()) {
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uncomp.expand_by(size / 2);
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}
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strm.next_out = (Bytef *) (uncomp.in() + strm.total_out);
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strm.avail_out = uncomp.size() - strm.total_out;
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// Inflate another chunk.
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err = inflate(&strm, Z_SYNC_FLUSH);
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if (err == Z_STREAM_END) {
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done = true;
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} else if (err != Z_OK) {
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return Err(fmt::format("unable to uncompress: {} -- {}",
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src, strm.msg ? strm.msg : zError(err)));
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}
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}
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if (inflateEnd(&strm) != Z_OK) {
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return Err(fmt::format("unable to uncompress: {} -- {}",
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src, strm.msg ? strm.msg : zError(err)));
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}
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return Ok(std::move(uncomp.shrink_to(strm.total_out)));
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}
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}
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}
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