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/*
* List files and extract file from rars by using external executable unrar.
*
* Copyright (C) 2005 Jindrich Makovicka <makovick gmail com>
* Copyright (C) 2007 Ulion <ulion2002 gmail com>
*
* This file is part of MPlayer.
*
* MPlayer 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 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <locale.h>
#include "unrar_exec.h"
#include "mp_msg.h"
#define UNRAR_LIST 1
#define UNRAR_EXTRACT 2
char* unrar_executable = NULL;
static FILE* launch_pipe(pid_t *apid, const char *executable, int action,
const char *archive, const char *filename)
{
if (!executable || access(executable, R_OK | X_OK)) return NULL;
if (access(archive, R_OK)) return NULL;
{
int mypipe[2];
pid_t pid;
if (pipe(mypipe)) {
mp_msg(MSGT_GLOBAL, MSGL_ERR, "UnRAR: Cannot create pipe.\n");
return NULL;
}
pid = fork();
if (pid == 0) {
/* This is the child process. Execute the unrar executable. */
close(mypipe[0]);
// Close MPlayer's stdin, stdout and stderr so the unrar binary
// can not mess them up.
// TODO: Close all other files except the pipe.
close(0); close(1); close(2);
// Assign new stdin, stdout and stderr and check they actually got the
// right descriptors.
if (open("/dev/null", O_RDONLY) != 0 || dup(mypipe[1]) != 1
|| open("/dev/null", O_WRONLY) != 2)
_exit(EXIT_FAILURE);
if (action == UNRAR_LIST)
execl(executable, executable, "v", archive, NULL);
else if (action == UNRAR_EXTRACT)
execl(executable, executable, "p", "-inul", "-p-",
archive,filename,NULL);
mp_msg(MSGT_GLOBAL, MSGL_ERR, "UnRAR: Cannot execute %s\n", executable);
_exit(EXIT_FAILURE);
}
if (pid < 0) {
/* The fork failed. Report failure. */
mp_msg(MSGT_GLOBAL, MSGL_ERR, "UnRAR: Fork failed\n");
return NULL;
}
/* This is the parent process. Prepare the pipe stream. */
close(mypipe[1]);
*apid = pid;
if (action == UNRAR_LIST)
mp_msg(MSGT_GLOBAL, MSGL_V,
"UnRAR: call unrar with command line: %s v %s\n",
executable, archive);
else if (action == UNRAR_EXTRACT)
mp_msg(MSGT_GLOBAL, MSGL_V,
"UnRAR: call unrar with command line: %s p -inul -p- %s %s\n",
executable, archive, filename);
return fdopen(mypipe[0], "r");
}
}
#define ALLOC_INCR 1 * 1024 * 1024
int unrar_exec_get(unsigned char **output, unsigned long *size,
const char *filename, const char *rarfile)
{
int bufsize = ALLOC_INCR, bytesread;
pid_t pid;
int status = 0;
FILE *rar_pipe;
rar_pipe=launch_pipe(&pid,unrar_executable,UNRAR_EXTRACT,rarfile,filename);
if (!rar_pipe) return 0;
*size = 0;
*output = malloc(bufsize);
while (*output) {
bytesread=fread(*output+*size, 1, bufsize-*size, rar_pipe);
if (bytesread <= 0)
break;
*size += bytesread;
if (*size == bufsize) {
char *p;
bufsize += ALLOC_INCR;
p = realloc(*output, bufsize);
if (!p)
free(*output);
*output = p;
}
}
fclose(rar_pipe);
pid = waitpid(pid, &status, 0);
if (!*output || !*size || (pid == -1 && errno != ECHILD) ||
(pid > 0 && status)) {
free(*output);
*output = NULL;
*size = 0;
return 0;
}
if (bufsize > *size) {
char *p = realloc(*output, *size);
if (p)
*output = p;
}
mp_msg(MSGT_GLOBAL, MSGL_V, "UnRAR: got file %s len %lu\n", filename,*size);
return 1;
}
#define PARSE_NAME 0
#define PARSE_PROPS 1
int unrar_exec_list(const char *rarfile, ArchiveList_struct **list)
{
char buf[1024], fname[1024];
char *p;
pid_t pid;
int status = 0, file_num = -1, ignore_next_line = 0, state = PARSE_NAME;
FILE *rar_pipe;
ArchiveList_struct *alist = NULL, *current = NULL, *new;
rar_pipe = launch_pipe(&pid, unrar_executable, UNRAR_LIST, rarfile, NULL);
if (!rar_pipe) return -1;
while (fgets(buf, sizeof(buf), rar_pipe)) {
int packsize, unpsize, ratio, day, month, year, hour, min;
int llen = strlen(buf);
// If read nothing, we got a file_num -1.
if (file_num == -1)
file_num = 0;
if (buf[llen-1] != '\n')
// The line is too long, ignore it.
ignore_next_line = 2;
if (ignore_next_line) {
--ignore_next_line;
state = PARSE_NAME;
continue;
}
// Trim the line.
while (llen > 0 && strchr(" \t\n\r\v\f", buf[llen-1]))
--llen;
buf[llen] = '\0';
p = buf;
while (*p && strchr(" \t\n\r\v\f", *p))
++p;
if (!*p) {
state = PARSE_NAME;
continue;
}
if (state == PARSE_PROPS && sscanf(p, "%d %d %d%% %d-%d-%d %d:%d",
&unpsize, &packsize, &ratio, &day,
&month, &year, &hour, &min) == 8) {
new = calloc(1, sizeof(ArchiveList_struct));
if (!new) {
file_num = -1;
break;
}
if (!current)
alist = new;
else
current->next = new;
current = new;
current->item.Name = strdup(fname);
state = PARSE_NAME;
if (!current->item.Name) {
file_num = -1;
break;
}
current->item.PackSize = packsize;
current->item.UnpSize = unpsize;
++file_num;
continue;
}
strcpy(fname, p);
state = PARSE_PROPS;
}
fclose(rar_pipe);
pid = waitpid(pid, &status, 0);
if (file_num < 0 || (pid == -1 && errno != ECHILD) ||
(pid > 0 && status)) {
unrar_exec_freelist(alist);
return -1;
}
if (!alist)
return -1;
*list = alist;
mp_msg(MSGT_GLOBAL, MSGL_V, "UnRAR: list got %d files\n", file_num);
return file_num;
}
void unrar_exec_freelist(ArchiveList_struct *list)
{
ArchiveList_struct* tmp;
while (list) {
tmp = list->next;
free(list->item.Name);
free(list);
list = tmp;
}
}
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