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.
795 lines
24 KiB
C++
795 lines
24 KiB
C++
/**
|
|
* Copyright (c) 2007-2012, 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 line_buffer.cc
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#ifdef HAVE_BZLIB_H
|
|
#include <bzlib.h>
|
|
#endif
|
|
|
|
#include <set>
|
|
|
|
#ifdef HAVE_X86INTRIN_H
|
|
#include "simdutf8check.h"
|
|
#endif
|
|
|
|
#include "base/math_util.hh"
|
|
#include "base/is_utf8.hh"
|
|
#include "line_buffer.hh"
|
|
#include "fmtlib/fmt/format.h"
|
|
|
|
using namespace std;
|
|
|
|
static const ssize_t DEFAULT_INCREMENT = 128 * 1024;
|
|
static const ssize_t MAX_COMPRESSED_BUFFER_SIZE = 32 * 1024 * 1024;
|
|
|
|
/*
|
|
* XXX REMOVE ME
|
|
*
|
|
* The stock bzipped file code does not use pread, so we need to use a lock to
|
|
* get exclusive access to the file. In the future, we should just rewrite
|
|
* the bzipped file code to use pread.
|
|
*/
|
|
class lock_hack {
|
|
public:
|
|
class guard {
|
|
public:
|
|
|
|
guard() : g_lock(lock_hack::singleton())
|
|
{
|
|
this->g_lock.lock();
|
|
};
|
|
|
|
~guard()
|
|
{
|
|
this->g_lock.unlock();
|
|
};
|
|
|
|
private:
|
|
lock_hack &g_lock;
|
|
};
|
|
|
|
static lock_hack &singleton()
|
|
{
|
|
static lock_hack retval;
|
|
|
|
return retval;
|
|
};
|
|
|
|
void lock()
|
|
{
|
|
lockf(this->lh_fd, F_LOCK, 0);
|
|
};
|
|
|
|
void unlock()
|
|
{
|
|
lockf(this->lh_fd, F_ULOCK, 0);
|
|
};
|
|
|
|
private:
|
|
|
|
lock_hack()
|
|
{
|
|
char lockname[64];
|
|
|
|
snprintf(lockname, sizeof(lockname), "/tmp/lnav.%d.lck", getpid());
|
|
this->lh_fd = open(lockname, O_CREAT | O_RDWR, 0600);
|
|
log_perror(fcntl(this->lh_fd, F_SETFD, FD_CLOEXEC));
|
|
unlink(lockname);
|
|
};
|
|
|
|
auto_fd lh_fd;
|
|
};
|
|
/* XXX END */
|
|
|
|
static int32_t read_le32(const unsigned char *data)
|
|
{
|
|
return (
|
|
(data[0] << 0) |
|
|
(data[1] << 8) |
|
|
(data[2] << 16) |
|
|
(data[3] << 24));
|
|
}
|
|
|
|
#define Z_BUFSIZE 65536U
|
|
#define SYNCPOINT_SIZE (1024 * 1024)
|
|
line_buffer::gz_indexed::gz_indexed()
|
|
{
|
|
if ((this->inbuf = (Bytef *)malloc(Z_BUFSIZE)) == NULL) {
|
|
throw bad_alloc();
|
|
}
|
|
}
|
|
|
|
void line_buffer::gz_indexed::close()
|
|
{
|
|
// Release old stream, if we were open
|
|
if (*this) {
|
|
inflateEnd(&this->strm);
|
|
::close(this->gz_fd);
|
|
this->syncpoints.clear();
|
|
this->gz_fd = -1;
|
|
}
|
|
}
|
|
|
|
void line_buffer::gz_indexed::init_stream()
|
|
{
|
|
if (*this) {
|
|
inflateEnd(&this->strm);
|
|
}
|
|
|
|
// initialize inflate struct
|
|
this->strm.zalloc = Z_NULL;
|
|
this->strm.zfree = Z_NULL;
|
|
this->strm.opaque = Z_NULL;
|
|
this->strm.avail_in = 0;
|
|
this->strm.next_in = Z_NULL;
|
|
this->strm.avail_out = 0;
|
|
int rc = inflateInit2(&strm, GZ_HEADER_MODE);
|
|
if (rc != Z_OK) {
|
|
throw(rc); // FIXME: exception wrapper
|
|
}
|
|
}
|
|
|
|
void line_buffer::gz_indexed::continue_stream()
|
|
{
|
|
// Save our position and output buffer
|
|
auto total_in = this->strm.total_in;
|
|
auto total_out = this->strm.total_out;
|
|
auto avail_out = this->strm.avail_out;
|
|
auto next_out = this->strm.next_out;
|
|
|
|
init_stream();
|
|
|
|
// Restore position and output buffer
|
|
this->strm.total_in = total_in;
|
|
this->strm.total_out = total_out;
|
|
this->strm.avail_out = avail_out;
|
|
this->strm.next_out = next_out;
|
|
}
|
|
|
|
void line_buffer::gz_indexed::open(int fd)
|
|
{
|
|
this->close();
|
|
this->init_stream();
|
|
this->gz_fd = fd;
|
|
}
|
|
|
|
int line_buffer::gz_indexed::stream_data(void * buf, size_t size)
|
|
{
|
|
this->strm.avail_out = size;
|
|
this->strm.next_out = (unsigned char *) buf;
|
|
|
|
size_t last = this->syncpoints.empty() ? 0 :
|
|
this->syncpoints.back().in;
|
|
while (this->strm.avail_out) {
|
|
if (!this->strm.avail_in) {
|
|
int rc = ::pread(this->gz_fd,
|
|
&this->inbuf[0],
|
|
Z_BUFSIZE,
|
|
this->strm.total_in);
|
|
if (rc < 0) {
|
|
return rc;
|
|
}
|
|
this->strm.next_in = this->inbuf;
|
|
this->strm.avail_in = rc;
|
|
}
|
|
if (this->strm.avail_in) {
|
|
int flush = last > this->strm.total_in
|
|
? Z_SYNC_FLUSH : Z_BLOCK;
|
|
auto err = inflate(&this->strm, flush);
|
|
if (err == Z_STREAM_END) {
|
|
// Reached end of stream; re-init for a possible subsequent stream
|
|
continue_stream();
|
|
} else if (err != Z_OK) {
|
|
log_error(" inflate-error: %d %s", (int)err, this->strm.msg ? this->strm.msg : "");
|
|
break;
|
|
}
|
|
|
|
if (this->strm.total_in >= last + SYNCPOINT_SIZE &&
|
|
size > this->strm.avail_out + GZ_WINSIZE &&
|
|
(this->strm.data_type & GZ_END_OF_BLOCK_MASK) &&
|
|
!(this->strm.data_type & GZ_END_OF_FILE_MASK))
|
|
{
|
|
this->syncpoints.emplace_back(this->strm, size);
|
|
last = this->strm.total_out;
|
|
}
|
|
} else if (this->strm.avail_out) {
|
|
// Processed all the gz file data but didn't fill
|
|
// the output buffer. We're done, even though we
|
|
// produced fewer bytes than requested.
|
|
break;
|
|
}
|
|
}
|
|
return size - this->strm.avail_out;
|
|
}
|
|
|
|
void line_buffer::gz_indexed::seek(off_t offset)
|
|
{
|
|
if ((size_t) offset == this->strm.total_out) {
|
|
return;
|
|
}
|
|
|
|
indexDict * dict = nullptr;
|
|
// Find highest syncpoint not past offset
|
|
// FIXME: Make this a binary-tree search
|
|
for (auto &d : this->syncpoints) {
|
|
if (d.out <= offset) {
|
|
dict = &d;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Choose highest available syncpoint, or keep current offset if it's ok
|
|
if ((size_t) offset < this->strm.total_out ||
|
|
(dict && this->strm.total_out < (size_t) dict->out)) {
|
|
// Release the old z_stream
|
|
inflateEnd(&this->strm);
|
|
if (dict) {
|
|
dict->apply(&this->strm);
|
|
} else {
|
|
init_stream();
|
|
}
|
|
}
|
|
|
|
// Stream from compressed file until we reach our offset
|
|
unsigned char dummy[Z_BUFSIZE];
|
|
while ((size_t) offset > this->strm.total_out) {
|
|
size_t to_copy = std::min(
|
|
static_cast<size_t>(Z_BUFSIZE),
|
|
static_cast<size_t>(offset - this->strm.total_out));
|
|
auto bytes = stream_data(dummy, to_copy);
|
|
if (bytes <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int line_buffer::gz_indexed::read(void * buf, size_t offset, size_t size)
|
|
{
|
|
if (offset != this->strm.total_out) {
|
|
this->seek(offset);
|
|
}
|
|
|
|
int bytes = stream_data(buf, size);
|
|
|
|
return bytes;
|
|
}
|
|
|
|
line_buffer::line_buffer()
|
|
: lb_bz_file(false),
|
|
lb_compressed_offset(0),
|
|
lb_file_size(-1),
|
|
lb_file_offset(0),
|
|
lb_file_time(0),
|
|
lb_buffer_size(0),
|
|
lb_buffer_max(DEFAULT_LINE_BUFFER_SIZE),
|
|
lb_seekable(false),
|
|
lb_last_line_offset(-1)
|
|
{
|
|
if ((this->lb_buffer = (char *)malloc(this->lb_buffer_max)) == nullptr) {
|
|
throw bad_alloc();
|
|
}
|
|
|
|
ensure(this->invariant());
|
|
}
|
|
|
|
line_buffer::~line_buffer()
|
|
{
|
|
auto empty_fd = auto_fd();
|
|
|
|
// Make sure any shared refs take ownership of the data.
|
|
this->lb_share_manager.invalidate_refs();
|
|
this->set_fd(empty_fd);
|
|
}
|
|
|
|
void line_buffer::set_fd(auto_fd &fd)
|
|
{
|
|
file_off_t newoff = 0;
|
|
|
|
if (this->lb_gz_file) {
|
|
this->lb_gz_file.close();
|
|
}
|
|
|
|
if (this->lb_bz_file) {
|
|
this->lb_bz_file = false;
|
|
}
|
|
|
|
if (fd != -1) {
|
|
/* Sync the fd's offset with the object. */
|
|
newoff = lseek(fd, 0, SEEK_CUR);
|
|
if (newoff == -1) {
|
|
if (errno != ESPIPE) {
|
|
throw error(errno);
|
|
}
|
|
|
|
/* It's a pipe, start with a zero offset. */
|
|
newoff = 0;
|
|
this->lb_seekable = false;
|
|
}
|
|
else {
|
|
char gz_id[2 + 1 + 1 + 4];
|
|
|
|
if (pread(fd, gz_id, sizeof(gz_id), 0) == sizeof(gz_id)) {
|
|
if (gz_id[0] == '\037' && gz_id[1] == '\213') {
|
|
int gzfd = dup(fd);
|
|
|
|
log_perror(fcntl(gzfd, F_SETFD, FD_CLOEXEC));
|
|
if (lseek(fd, 0, SEEK_SET) < 0) {
|
|
close(gzfd);
|
|
throw error(errno);
|
|
}
|
|
lb_gz_file.open(gzfd);
|
|
this->lb_file_time = read_le32(
|
|
(const unsigned char *)&gz_id[4]);
|
|
if (this->lb_file_time < 0) {
|
|
this->lb_file_time = 0;
|
|
}
|
|
this->lb_compressed_offset = lseek(this->lb_fd, 0, SEEK_CUR);
|
|
}
|
|
#ifdef HAVE_BZLIB_H
|
|
else if (gz_id[0] == 'B' && gz_id[1] == 'Z') {
|
|
if (lseek(fd, 0, SEEK_SET) < 0) {
|
|
throw error(errno);
|
|
}
|
|
this->lb_bz_file = true;
|
|
|
|
/*
|
|
* Loading data from a bzip2 file is pretty slow, so we try
|
|
* to keep as much in memory as possible.
|
|
*/
|
|
this->resize_buffer(MAX_COMPRESSED_BUFFER_SIZE);
|
|
|
|
this->lb_compressed_offset = 0;
|
|
}
|
|
#endif
|
|
}
|
|
this->lb_seekable = true;
|
|
}
|
|
}
|
|
this->lb_file_offset = newoff;
|
|
this->lb_buffer_size = 0;
|
|
this->lb_fd = std::move(fd);
|
|
|
|
ensure(this->invariant());
|
|
}
|
|
|
|
void line_buffer::resize_buffer(size_t new_max)
|
|
{
|
|
require(this->lb_bz_file || this->lb_gz_file ||
|
|
new_max <= MAX_LINE_BUFFER_SIZE);
|
|
|
|
if (new_max > (size_t)this->lb_buffer_max) {
|
|
char *tmp, *old;
|
|
|
|
/* Still need more space, try a realloc. */
|
|
old = this->lb_buffer.release();
|
|
this->lb_share_manager.invalidate_refs();
|
|
tmp = (char *) realloc(old, new_max);
|
|
if (tmp != NULL) {
|
|
this->lb_buffer = tmp;
|
|
this->lb_buffer_max = new_max;
|
|
} else {
|
|
this->lb_buffer = old;
|
|
|
|
throw error(ENOMEM);
|
|
}
|
|
}
|
|
}
|
|
|
|
void line_buffer::ensure_available(file_off_t start, ssize_t max_length)
|
|
{
|
|
ssize_t prefill, available;
|
|
|
|
require(max_length <= MAX_LINE_BUFFER_SIZE);
|
|
|
|
if (this->lb_file_size != -1) {
|
|
if (start + (file_off_t)max_length > this->lb_file_size) {
|
|
max_length = (this->lb_file_size - start);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see if the start is inside the cached range or immediately
|
|
* after.
|
|
*/
|
|
if (start < this->lb_file_offset ||
|
|
start > (file_off_t)(this->lb_file_offset + this->lb_buffer_size)) {
|
|
/*
|
|
* The request is outside the cached range, need to reload the
|
|
* whole thing.
|
|
*/
|
|
this->lb_share_manager.invalidate_refs();
|
|
prefill = 0;
|
|
this->lb_buffer_size = 0;
|
|
if ((this->lb_file_size != (ssize_t)-1) &&
|
|
(start + this->lb_buffer_max > this->lb_file_size)) {
|
|
/*
|
|
* If the start is near the end of the file, move the offset back a
|
|
* bit so we can get more of the file in the cache.
|
|
*/
|
|
this->lb_file_offset = this->lb_file_size -
|
|
std::min(this->lb_file_size,
|
|
(file_ssize_t) this->lb_buffer_max);
|
|
}
|
|
else {
|
|
this->lb_file_offset = start;
|
|
}
|
|
}
|
|
else {
|
|
/* The request is in the cached range. Record how much extra data is in
|
|
* the buffer before the requested range.
|
|
*/
|
|
prefill = start - this->lb_file_offset;
|
|
}
|
|
require(this->lb_file_offset <= start);
|
|
require(prefill <= this->lb_buffer_size);
|
|
|
|
available = this->lb_buffer_max - (start - this->lb_file_offset);
|
|
require(available <= this->lb_buffer_max);
|
|
|
|
if (max_length > available) {
|
|
/*
|
|
* Need more space, move any existing data to the front of the
|
|
* buffer.
|
|
*/
|
|
this->lb_share_manager.invalidate_refs();
|
|
|
|
this->lb_buffer_size -= prefill;
|
|
this->lb_file_offset += prefill;
|
|
memmove(&this->lb_buffer[0],
|
|
&this->lb_buffer[prefill],
|
|
this->lb_buffer_size);
|
|
|
|
available = this->lb_buffer_max - (start - this->lb_file_offset);
|
|
if (max_length > available) {
|
|
this->resize_buffer(
|
|
roundup_size(max_length, DEFAULT_INCREMENT));
|
|
}
|
|
}
|
|
}
|
|
|
|
bool line_buffer::fill_range(file_off_t start, ssize_t max_length)
|
|
{
|
|
bool retval = false;
|
|
|
|
require(start >= 0);
|
|
|
|
if (this->in_range(start) && this->in_range(start + max_length - 1)) {
|
|
/* Cache already has the data, nothing to do. */
|
|
retval = true;
|
|
}
|
|
else if (this->lb_fd != -1) {
|
|
ssize_t rc;
|
|
|
|
/* Make sure there is enough space, then */
|
|
this->ensure_available(start, max_length);
|
|
|
|
/* ... read in the new data. */
|
|
if (this->lb_gz_file) {
|
|
if (this->lb_file_size != (ssize_t)-1 &&
|
|
this->in_range(start) &&
|
|
this->in_range(this->lb_file_size - 1)) {
|
|
rc = 0;
|
|
}
|
|
else {
|
|
rc = this->lb_gz_file.read(&this->lb_buffer[this->lb_buffer_size],
|
|
this->lb_file_offset + this->lb_buffer_size,
|
|
this->lb_buffer_max - this->lb_buffer_size);
|
|
this->lb_compressed_offset = this->lb_gz_file.get_source_offset();
|
|
if (rc != -1 && (
|
|
rc < (this->lb_buffer_max - this->lb_buffer_size))) {
|
|
this->lb_file_size = (
|
|
this->lb_file_offset + this->lb_buffer_size + rc);
|
|
}
|
|
}
|
|
}
|
|
#ifdef HAVE_BZLIB_H
|
|
else if (this->lb_bz_file) {
|
|
if (this->lb_file_size != (ssize_t)-1 &&
|
|
(((ssize_t)start >= this->lb_file_size) ||
|
|
(this->in_range(start) &&
|
|
this->in_range(this->lb_file_size - 1)))) {
|
|
rc = 0;
|
|
}
|
|
else {
|
|
lock_hack::guard guard;
|
|
char scratch[32 * 1024];
|
|
BZFILE * bz_file;
|
|
file_off_t seek_to;
|
|
int bzfd;
|
|
|
|
/*
|
|
* Unfortunately, there is no bzseek, so we need to reopen the
|
|
* file every time we want to do a read.
|
|
*/
|
|
bzfd = dup(this->lb_fd);
|
|
if (lseek(this->lb_fd, 0, SEEK_SET) < 0) {
|
|
close(bzfd);
|
|
throw error(errno);
|
|
}
|
|
if ((bz_file = BZ2_bzdopen(bzfd, "r")) == NULL) {
|
|
close(bzfd);
|
|
if (errno == 0) {
|
|
throw bad_alloc();
|
|
}
|
|
else{
|
|
throw error(errno);
|
|
}
|
|
}
|
|
|
|
seek_to = this->lb_file_offset + this->lb_buffer_size;
|
|
while (seek_to > 0) {
|
|
int count;
|
|
|
|
count = BZ2_bzread(bz_file,
|
|
scratch,
|
|
std::min((size_t)seek_to,
|
|
sizeof(scratch)));
|
|
seek_to -= count;
|
|
}
|
|
rc = BZ2_bzread(bz_file,
|
|
&this->lb_buffer[this->lb_buffer_size],
|
|
this->lb_buffer_max - this->lb_buffer_size);
|
|
this->lb_compressed_offset = lseek(bzfd, 0, SEEK_SET);
|
|
BZ2_bzclose(bz_file);
|
|
|
|
if (rc != -1 && (
|
|
rc < (this->lb_buffer_max - this->lb_buffer_size))) {
|
|
this->lb_file_size = (
|
|
this->lb_file_offset + this->lb_buffer_size + rc);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
else if (this->lb_seekable) {
|
|
rc = pread(this->lb_fd,
|
|
&this->lb_buffer[this->lb_buffer_size],
|
|
this->lb_buffer_max - this->lb_buffer_size,
|
|
this->lb_file_offset + this->lb_buffer_size);
|
|
}
|
|
else {
|
|
rc = read(this->lb_fd,
|
|
&this->lb_buffer[this->lb_buffer_size],
|
|
this->lb_buffer_max - this->lb_buffer_size);
|
|
}
|
|
// XXX For some reason, cygwin is giving us a bogus return value when
|
|
// up to the end of the file.
|
|
if (rc > (this->lb_buffer_max - this->lb_buffer_size)) {
|
|
rc = -1;
|
|
#ifdef ENODATA
|
|
errno = ENODATA;
|
|
#else
|
|
errno = EAGAIN;
|
|
#endif
|
|
}
|
|
switch (rc) {
|
|
case 0:
|
|
if (!this->lb_seekable) {
|
|
this->lb_file_size = this->lb_file_offset + this->lb_buffer_size;
|
|
}
|
|
if (start < (file_off_t) this->lb_file_size) {
|
|
retval = true;
|
|
}
|
|
|
|
if (this->lb_gz_file || this->lb_bz_file) {
|
|
/*
|
|
* For compressed files, increase the buffer size so we don't
|
|
* have to spend as much time uncompressing the data.
|
|
*/
|
|
this->resize_buffer(MAX_COMPRESSED_BUFFER_SIZE);
|
|
}
|
|
break;
|
|
|
|
case (ssize_t)-1:
|
|
switch (errno) {
|
|
#ifdef ENODATA
|
|
/* Cygwin seems to return this when pread reaches the end of the */
|
|
/* file. */
|
|
case ENODATA:
|
|
#endif
|
|
case EINTR:
|
|
case EAGAIN:
|
|
break;
|
|
|
|
default:
|
|
throw error(errno);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
this->lb_buffer_size += rc;
|
|
retval = true;
|
|
break;
|
|
}
|
|
|
|
ensure(this->lb_buffer_size <= this->lb_buffer_max);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
Result<line_info, string> line_buffer::load_next_line(file_range prev_line)
|
|
{
|
|
ssize_t request_size = DEFAULT_INCREMENT;
|
|
bool done = false;
|
|
line_info retval;
|
|
|
|
require(this->lb_fd != -1);
|
|
|
|
auto offset = prev_line.next_offset();
|
|
retval.li_file_range.fr_offset = offset;
|
|
while (!done) {
|
|
char *line_start, *lf;
|
|
|
|
this->fill_range(offset, request_size);
|
|
|
|
/* Find the data in the cache and */
|
|
line_start = this->get_range(offset, retval.li_file_range.fr_size);
|
|
/* ... look for the end-of-line or end-of-file. */
|
|
ssize_t utf8_end = -1;
|
|
|
|
#ifdef HAVE_X86INTRIN_H
|
|
if (!validate_utf8_fast(line_start, retval.li_file_range.fr_size, &utf8_end)) {
|
|
retval.li_valid_utf = false;
|
|
}
|
|
#else
|
|
{
|
|
const char *msg;
|
|
int faulty_bytes;
|
|
|
|
utf8_end = is_utf8((unsigned char *) line_start, retval.li_file_range.fr_size, &msg, &faulty_bytes);
|
|
if (msg != nullptr) {
|
|
lf = (char *) memchr(line_start, '\n', retval.li_file_range.fr_size);
|
|
utf8_end = lf - line_start;
|
|
retval.li_valid_utf = false;
|
|
}
|
|
}
|
|
#endif
|
|
if (utf8_end >= 0) {
|
|
lf = line_start + utf8_end;
|
|
} else {
|
|
lf = nullptr;
|
|
}
|
|
|
|
if (lf != nullptr ||
|
|
(retval.li_file_range.fr_size >= MAX_LINE_BUFFER_SIZE) ||
|
|
(request_size == MAX_LINE_BUFFER_SIZE) ||
|
|
((request_size > retval.li_file_range.fr_size) &&
|
|
(retval.li_file_range.fr_size > 0) &&
|
|
(!this->is_pipe() || request_size > DEFAULT_INCREMENT))) {
|
|
if ((lf != nullptr) &&
|
|
((size_t) (lf - line_start) >= MAX_LINE_BUFFER_SIZE - 1)) {
|
|
lf = nullptr;
|
|
}
|
|
if (lf != nullptr) {
|
|
retval.li_partial = false;
|
|
retval.li_file_range.fr_size = lf - line_start;
|
|
// delim
|
|
retval.li_file_range.fr_size += 1;
|
|
if (offset >= this->lb_last_line_offset) {
|
|
this->lb_last_line_offset = offset + retval.li_file_range.fr_size;
|
|
}
|
|
}
|
|
else {
|
|
if (retval.li_file_range.fr_size >= MAX_LINE_BUFFER_SIZE) {
|
|
log_warning("Line exceeded max size: offset=%d",
|
|
offset);
|
|
retval.li_file_range.fr_size = MAX_LINE_BUFFER_SIZE - 1;
|
|
retval.li_partial = false;
|
|
}
|
|
else {
|
|
retval.li_partial = true;
|
|
}
|
|
this->ensure_available(offset, retval.li_file_range.fr_size);
|
|
|
|
if (retval.li_file_range.fr_size >= MAX_LINE_BUFFER_SIZE) {
|
|
retval.li_file_range.fr_size = MAX_LINE_BUFFER_SIZE - 1;
|
|
}
|
|
if (retval.li_partial) {
|
|
/*
|
|
* Since no delimiter was seen, we need to remember the offset
|
|
* of the last line in the file so we don't mistakenly return
|
|
* two partial lines to the caller.
|
|
*
|
|
* 1. read_line() - returns partial line
|
|
* 2. file is written
|
|
* 3. read_line() - returns the middle of partial line.
|
|
*/
|
|
this->lb_last_line_offset = offset;
|
|
}
|
|
else if (offset >= this->lb_last_line_offset) {
|
|
this->lb_last_line_offset = offset + retval.li_file_range.fr_size;
|
|
}
|
|
}
|
|
|
|
offset += retval.li_file_range.fr_size;
|
|
|
|
done = true;
|
|
}
|
|
else {
|
|
if (!this->is_pipe() || !this->is_pipe_closed()) {
|
|
retval.li_partial = true;
|
|
}
|
|
request_size += DEFAULT_INCREMENT;
|
|
}
|
|
|
|
if (!done && !this->fill_range(offset, request_size)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
ensure(retval.li_file_range.fr_size <= this->lb_buffer_size);
|
|
ensure(this->invariant());
|
|
|
|
return Ok(retval);
|
|
}
|
|
|
|
Result<shared_buffer_ref, std::string> line_buffer::read_range(const file_range fr)
|
|
{
|
|
shared_buffer_ref retval;
|
|
char *line_start;
|
|
file_ssize_t avail;
|
|
|
|
if (this->lb_last_line_offset != -1 &&
|
|
fr.fr_offset > this->lb_last_line_offset) {
|
|
/*
|
|
* Don't return anything past the last known line. The caller needs
|
|
* to try reading at the offset of the last line again.
|
|
*/
|
|
return Err(string("out-of-bounds"));
|
|
}
|
|
|
|
if (!this->fill_range(fr.fr_offset, fr.fr_size)) {
|
|
return Err(string("unable to read file"));
|
|
}
|
|
line_start = this->get_range(fr.fr_offset, avail);
|
|
|
|
if (fr.fr_size > avail) {
|
|
return Err(fmt::format("short-read (need: {}; avail: {})",
|
|
fr.fr_size, avail));
|
|
}
|
|
retval.share(this->lb_share_manager, line_start, fr.fr_size);
|
|
|
|
return Ok(retval);
|
|
}
|
|
|
|
file_range line_buffer::get_available()
|
|
{
|
|
return {this->lb_file_offset, this->lb_buffer_size};
|
|
}
|