Support using unrar executable to access rar-compressed vobsub files.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25389 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 236 insertions, 0 deletions

diff --git a/unrar_exec.c b/unrar_exec.c
new file mode 100644
index 0000000000..29a531fb61
--- /dev/null
+++ b/unrar_exec.c
@@ -0,0 +1,236 @@
+/*
+ * 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/types.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;
+    }
+}
+