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/*
* xfer-file.c - file functions for xfer plugin
*
* Copyright (C) 2003-2024 Sébastien Helleu <flashcode@flashtux.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* WeeChat is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WeeChat. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <sys/wait.h>
#include "../weechat-plugin.h"
#include "xfer.h"
#include "xfer-file.h"
#include "xfer-buffer.h"
#include "xfer-config.h"
/*
* Searches CRC32 in a filename.
*
* If more than one CRC32 are found, the last one is returned
* (with the higher index in filename).
*
* The chars before/after CRC32 must be either beginning/end of string or
* non-hexadecimal chars.
*
* Examples:
*
* test_filename => NULL (not found: no CRC32)
* test_1234abcd => "1234abcd"
* 1234abcd_test => "1234abcd"
* 1234abcd_12345678 => "12345678"
* 123456781234abcd => NULL (not found: missing delimiter around CRC32)
*
* Returns pointer to last CRC32 in string, NULL if no CRC32 was found.
*/
const char *
xfer_file_search_crc32 (const char *filename)
{
int length;
const char *ptr_string, *ptr_crc32;
length = 0;
ptr_crc32 = NULL;
ptr_string = filename;
while (ptr_string && ptr_string[0])
{
if (((ptr_string[0] >= '0') && (ptr_string[0] <= '9'))
|| ((ptr_string[0] >= 'A') && (ptr_string[0] <= 'F'))
|| ((ptr_string[0] >= 'a') && (ptr_string[0] <= 'f')))
{
length++;
}
else
{
if (length == 8)
ptr_crc32 = ptr_string - 8;
length = 0;
}
ptr_string = weechat_utf8_next_char (ptr_string);
}
if (length == 8)
ptr_crc32 = ptr_string - 8;
return ptr_crc32;
}
/*
* Resumes a download.
*
* Returns:
* 1: OK
* 0: not resumable
*/
int
xfer_file_resume (struct t_xfer *xfer, const char *filename)
{
struct stat st;
if (!weechat_config_boolean (xfer_config_file_auto_resume))
return 0;
if (access (filename, W_OK) == 0)
{
if (stat (filename, &st) != -1)
{
if ((unsigned long long) st.st_size < xfer->size)
{
xfer->start_resume = (unsigned long long) st.st_size;
xfer->pos = xfer->start_resume;
xfer->last_check_pos = xfer->start_resume;
return 1;
}
}
}
/* not resumable */
return 0;
}
/*
* Checks if file can be downloaded with a given suffix index (if 0 the
* filename is unchanged, otherwise .1, .2, etc. are added to the filename).
*
* Returns 1 if the file can be downloaded with this suffix, 0 if it can not.
*/
int
xfer_file_check_suffix (struct t_xfer *xfer, int suffix)
{
char *new_filename, *new_temp_filename;
const char *ptr_suffix;
int rc, length_suffix, length, filename_exists, temp_filename_exists;
int same_files;
rc = 0;
new_filename = NULL;
new_temp_filename = NULL;
ptr_suffix = weechat_config_string (
xfer_config_file_download_temporary_suffix);
length_suffix = (ptr_suffix) ? strlen (ptr_suffix) : 0;
/* build filename with suffix */
if (suffix == 0)
{
new_filename = strdup (xfer->local_filename);
}
else
{
length = strlen (xfer->local_filename) + 16 + 1;
new_filename = malloc (length);
if (new_filename)
{
snprintf (new_filename, length, "%s.%d",
xfer->local_filename,
suffix);
}
}
if (!new_filename)
goto error;
/* build temp filename with suffix */
length = strlen (new_filename) + length_suffix + 1;
new_temp_filename = malloc (length);
if (!new_temp_filename)
goto error;
snprintf (new_temp_filename, length,
"%s%s",
new_filename,
(ptr_suffix) ? ptr_suffix : "");
filename_exists = (access (new_filename, F_OK) == 0);
temp_filename_exists = (access (new_temp_filename, F_OK) == 0);
same_files = (length_suffix == 0);
/* if both filenames don't exist, we can use this prefix */
if (!filename_exists && !temp_filename_exists)
goto use_prefix;
/*
* we try to resume if one of this condition is true:
* - filename == temp filename and it exists
* - filename != temp filename and only the temp filename exists
* in any other case, we skip this suffix index
*/
if ((same_files && filename_exists)
|| (!same_files && !filename_exists && temp_filename_exists))
{
if (xfer_file_resume (xfer, new_temp_filename))
goto use_prefix;
}
/* we skip this suffix index */
goto end;
use_prefix:
free (xfer->local_filename);
xfer->local_filename = new_filename;
xfer->temp_local_filename = new_temp_filename;
return 1;
error:
/*
* in case of error, we remove the local filename and return 1 to stop the
* infinite loop used to find a suffix index
*/
free (xfer->local_filename);
xfer->local_filename = NULL;
rc = 1;
end:
free (new_filename);
free (new_temp_filename);
return rc;
}
/*
* Finds the suffix needed for a file, if the file already exists.
*
* If no suffix is needed, nothing is changed in the xfer.
* If a suffix is needed, temp_local_filename and local_filename are changed
* and filename_suffix is set with the suffix number (starts to 1).
*/
void
xfer_file_find_suffix (struct t_xfer *xfer)
{
if (xfer_file_check_suffix (xfer, 0))
return;
/* if auto rename is not set, then abort xfer */
if (!weechat_config_boolean (xfer_config_file_auto_rename))
{
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return;
}
/* loop until we find a suffix we can use, starting with suffix == 1 */
xfer->filename_suffix = 0;
while (!xfer_file_check_suffix (xfer, ++xfer->filename_suffix))
{
}
}
/*
* Searches for local filename for a xfer.
*
* If type is file/recv, adds a suffix (like .1) if needed.
* If download is resumable, sets "start_resume" to good value.
*/
void
xfer_file_find_filename (struct t_xfer *xfer)
{
char *dir_separator, *path;
struct t_hashtable *options;
if (!XFER_IS_FILE(xfer->type))
return;
options = weechat_hashtable_new (
32,
WEECHAT_HASHTABLE_STRING,
WEECHAT_HASHTABLE_STRING,
NULL, NULL);
if (options)
weechat_hashtable_set (options, "directory", "data");
path = weechat_string_eval_path_home (
weechat_config_string (xfer_config_file_download_path),
NULL, NULL, options);
if (options)
weechat_hashtable_free (options);
if (!path)
return;
xfer->local_filename = malloc (strlen (path) +
strlen (xfer->remote_nick) +
strlen (xfer->filename) + 4);
if (!xfer->local_filename)
{
free (path);
return;
}
strcpy (xfer->local_filename, path);
dir_separator = weechat_info_get ("dir_separator", "");
if (dir_separator
&& (xfer->local_filename[strlen (xfer->local_filename) - 1] != dir_separator[0]))
{
strcat (xfer->local_filename, dir_separator);
}
free (dir_separator);
if (weechat_config_boolean (xfer_config_file_use_nick_in_filename))
{
strcat (xfer->local_filename, xfer->remote_nick);
strcat (xfer->local_filename, ".");
}
strcat (xfer->local_filename, xfer->filename);
free (path);
xfer_file_find_suffix (xfer);
}
/*
* Calculates xfer speed (for files only).
*/
void
xfer_file_calculate_speed (struct t_xfer *xfer, int ended)
{
time_t local_time, elapsed;
unsigned long long bytes_per_sec_total;
local_time = time (NULL);
if (ended || local_time > xfer->last_check_time)
{
if (ended)
{
/* calculate bytes per second (global) */
elapsed = local_time - xfer->start_transfer;
if (elapsed == 0)
elapsed = 1;
xfer->bytes_per_sec = (xfer->pos - xfer->start_resume) / elapsed;
xfer->eta = 0;
}
else
{
/* calculate ETA */
elapsed = local_time - xfer->start_transfer;
if (elapsed == 0)
elapsed = 1;
bytes_per_sec_total = (xfer->pos - xfer->start_resume) / elapsed;
if (bytes_per_sec_total == 0)
bytes_per_sec_total = 1;
xfer->eta = (xfer->size - xfer->pos) / bytes_per_sec_total;
/* calculate bytes per second (since last check time) */
elapsed = local_time - xfer->last_check_time;
if (elapsed == 0)
elapsed = 1;
xfer->bytes_per_sec = (xfer->pos - xfer->last_check_pos) / elapsed;
}
xfer->last_check_time = local_time;
xfer->last_check_pos = xfer->pos;
}
}
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