aboutsummaryrefslogtreecommitdiffhomepage
path: root/unrar_exec.c
blob: 6de8c59bef868e9d56e1a63ebdfe70390233fbaa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * 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;
    }
}