mpv/playtreeparser.c

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C
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#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef MP_DEBUG
#include <assert.h>
#endif
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "playtree.h"
#include "playtreeparser.h"
#include "libmpdemux/stream.h"
#include "mp_msg.h"
extern play_tree_t*
asx_parser_build_tree(char* buffer, int ref);
#define BUF_STEP 1024
#define WHITES " \n\r\t"
static void
strstrip(char* str) {
char* i;
for(i = str ; i[0] != '\0' && strchr(WHITES,i[0]) != NULL; i++)
/* NOTHING */;
if(i[0] != '\0') {
memmove(str,i,strlen(i));
for(i = str + strlen(str) ; strchr(WHITES,i[0]) != NULL; i--)
/* NOTHING */;
i[1] = '\0';
} else
str[0] = '\0';
}
static char*
play_tree_parser_get_line(play_tree_parser_t* p) {
char *end,*line_end;
int r,resize = 0;
if(p->buffer == NULL) {
p->buffer = (char*)malloc(BUF_STEP);
p->buffer_size = BUF_STEP;
p->iter = p->buffer;
}
if(p->stream->eof && (p->buffer_end == 0 || p->iter[0] == '\0'))
return NULL;
while(1) {
if(resize) {
r = p->iter - p->buffer;
p->buffer = (char*)realloc(p->buffer,p->buffer_size+BUF_STEP);
p->iter = p->buffer + r;
p->buffer_size += BUF_STEP;
resize = 0;
}
if(p->buffer_size - p->buffer_end > 1 && ! p->stream->eof) {
r = stream_read(p->stream,p->buffer + p->buffer_end,p->buffer_size - p->buffer_end - 1);
if(r > 0) {
p->buffer_end += r;
p->buffer[p->buffer_end] = '\0';
}
}
end = strchr(p->iter,'\n');
if(!end) {
if(p->stream->eof) {
end = p->buffer + p->buffer_end;
break;
}
resize = 1;
continue;
}
break;
}
line_end = ((*(end-1)) == '\r') ? end-1 : end;
if(line_end - p->iter >= 0)
p->line = (char*)realloc(p->line,line_end - p->iter+1);
else
return NULL;
if(line_end - p->iter > 0)
strncpy(p->line,p->iter,line_end - p->iter);
p->line[line_end - p->iter] = '\0';
if(end[0] != '\0')
end++;
if(!p->keep) {
if(end[0] != '\0') {
p->buffer_end -= end-p->iter;
memmove(p->buffer,end,p->buffer_end);
} else
p->buffer_end = 0;
p->iter = p->buffer;
} else
p->iter = end;
return p->line;
}
static void
play_tree_parser_reset(play_tree_parser_t* p) {
p->iter = p->buffer;
}
static void
play_tree_parser_stop_keeping(play_tree_parser_t* p) {
p->keep = 0;
if(p->iter && p->iter != p->buffer) {
p->buffer_end -= p->iter -p->buffer;
if(p->buffer_end)
memmove(p->buffer,p->iter,p->buffer_end);
p->iter = p->buffer;
}
}
play_tree_t*
parse_asx(play_tree_parser_t* p) {
int comments = 0,get_line = 1;
char* line = NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying asx...\n");
while(1) {
if(get_line) {
line = play_tree_parser_get_line(p);
if(!line)
return NULL;
strstrip(line);
if(line[0] == '\0')
continue;
}
if(!comments) {
if(line[0] != '<') {
mp_msg(MSGT_PLAYTREE,MSGL_DBG2,"First char isn't '<' but '%c'\n",line[0]);
mp_msg(MSGT_PLAYTREE,MSGL_DBG3,"Buffer = [%s]\n",p->buffer);
return NULL;
} else if(strncmp(line,"<!--",4) == 0) { // Comments
comments = 1;
line += 4;
if(line[0] != '\0' && strlen(line) > 0)
get_line = 0;
} else if(strncasecmp(line,"<ASX",4) == 0) // We got an asx element
break;
else // We don't get an asx
return NULL;
} else { // Comments
char* c;
c = strchr(line,'-');
if(c) {
if (strncmp(c,"--!>",4) == 0) { // End of comments
comments = 0;
line = c+4;
if(line[0] != '\0') // There is some more data on this line : keep it
get_line = 0;
} else {
line = c+1; // Jump the -
if(line[0] != '\0') // Some more data
get_line = 0;
else // End of line
get_line = 1;
}
} else // No - on this line (or rest of line) : get next one
get_line = 1;
}
}
mp_msg(MSGT_PLAYTREE,MSGL_V,"Detected asx format\n");
// We have an asx : load it in memory and parse
while((line = play_tree_parser_get_line(p)) != NULL)
/* NOTHING */;
mp_msg(MSGT_PLAYTREE,MSGL_DBG3,"Parsing asx file : [%s]\n",p->buffer);
return asx_parser_build_tree(p->buffer,p->deep);
}
static char*
pls_entry_get_value(char* line) {
char* i;
i = strchr(line,'=');
if(!i || i[1] == '\0')
return NULL;
else
return i+1;
}
typedef struct pls_entry {
char* file;
char* title;
char* length;
} pls_entry_t;
static int
pls_read_entry(char* line,pls_entry_t** _e,int* _max_entry,char** val) {
int num,max_entry = (*_max_entry);
pls_entry_t* e = (*_e);
char* v;
v = pls_entry_get_value(line);
if(!v) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"No value in entry %s\n",line);
return 0;
}
num = atoi(line);
if(num < 0) {
num = max_entry+1;
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"No entry index in entry %s\nAssuming %d\n",line,num);
}
if(num > max_entry) {
e = (pls_entry_t*)realloc(e,num*sizeof(pls_entry_t));
memset(&e[max_entry],0,(num-max_entry)*sizeof(pls_entry_t));
max_entry = num;
}
(*_e) = e;
(*_max_entry) = max_entry;
(*val) = v;
return num;
}
play_tree_t*
parse_pls(play_tree_parser_t* p) {
char *line,*v;
pls_entry_t* entries = NULL;
int n_entries = 0,max_entry=0,num;
play_tree_t *list = NULL, *entry = NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying winamp playlist...\n");
line = play_tree_parser_get_line(p);
strstrip(line);
if(strcasecmp(line,"[playlist]"))
return NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Detected winamp playlist format\n");
play_tree_parser_stop_keeping(p);
line = play_tree_parser_get_line(p);
if(!line)
return NULL;
strstrip(line);
if(strncasecmp(line,"NumberOfEntries",15) == 0) {
v = pls_entry_get_value(line);
n_entries = atoi(v);
if(n_entries < 0)
mp_msg(MSGT_PLAYTREE,MSGL_DBG2,"Invalid number of entries : very funny !!!\n");
else
mp_msg(MSGT_PLAYTREE,MSGL_DBG2,"Playlist claim to have %d entries. Let's see.\n",n_entries);
line = play_tree_parser_get_line(p);
}
while(line) {
strstrip(line);
if(line[0] == '\0') {
line = play_tree_parser_get_line(p);
continue;
}
if(strncasecmp(line,"File",4) == 0) {
num = pls_read_entry(line+4,&entries,&max_entry,&v);
if(num < 0)
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"No value in entry %s\n",line);
else
entries[num-1].file = strdup(v);
} else if(strncasecmp(line,"Title",5) == 0) {
num = pls_read_entry(line+5,&entries,&max_entry,&v);
if(num < 0)
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"No value in entry %s\n",line);
else
entries[num-1].title = strdup(v);
} else if(strncasecmp(line,"Length",6) == 0) {
num = pls_read_entry(line+6,&entries,&max_entry,&v);
if(num < 0)
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"No value in entry %s\n",line);
else
entries[num-1].length = strdup(v);
} else
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"Unknow entry type %s\n",line);
line = play_tree_parser_get_line(p);
}
for(num = 0; num < max_entry ; num++) {
if(entries[num].file == NULL)
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Entry %d don't have a file !!!!\n",num+1);
else {
mp_msg(MSGT_PLAYTREE,MSGL_DBG2,"Adding entry %s\n",entries[num].file);
entry = play_tree_new();
play_tree_add_file(entry,entries[num].file);
free(entries[num].file);
if(list)
play_tree_append_entry(list,entry);
else
list = entry;
}
if(entries[num].title) {
// When we have info in playtree we add this info
free(entries[num].title);
}
if(entries[num].length) {
// When we have info in playtree we add this info
free(entries[num].length);
}
}
free(entries);
entry = play_tree_new();
play_tree_set_child(entry,list);
return entry;
}
play_tree_t*
parse_textplain(play_tree_parser_t* p) {
char* line;
play_tree_t *list = NULL, *entry = NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying plaintext...\n");
play_tree_parser_stop_keeping(p);
while((line = play_tree_parser_get_line(p)) != NULL) {
strstrip(line);
if(line[0] == '\0')
continue;
entry = play_tree_new();
play_tree_add_file(entry,line);
if(!list)
list = entry;
else
play_tree_append_entry(list,entry);
}
if(!list) return NULL;
entry = play_tree_new();
play_tree_set_child(entry,list);
return entry;
}
play_tree_t*
parse_playtree(stream_t *stream) {
play_tree_parser_t* p;
play_tree_t* ret;
#ifdef MP_DEBUG
assert(stream != NULL);
assert(stream->type == STREAMTYPE_PLAYLIST);
#endif
p = play_tree_parser_new(stream,0);
if(!p)
return NULL;
ret = play_tree_parser_get_play_tree(p);
play_tree_parser_free(p);
return ret;
}
play_tree_t*
parse_playlist_file(char* file) {
stream_t *stream;
play_tree_t* ret;
int fd;
if(!strcmp(file,"-"))
fd = 0;
else
fd = open(file,O_RDONLY);
if(fd < 0) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Error while opening playlist file %s : %s\n",file,strerror(errno));
return NULL;
}
mp_msg(MSGT_PLAYTREE,MSGL_V,"Parsing playlist file %s...\n",file);
stream = new_stream(fd,STREAMTYPE_PLAYLIST);
ret = parse_playtree(stream);
if(close(fd) < 0)
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Warning error while closing playlist file %s : %s\n",file,strerror(errno));
free_stream(stream);
return ret;
}
play_tree_parser_t*
play_tree_parser_new(stream_t* stream,int deep) {
play_tree_parser_t* p;
p = (play_tree_parser_t*)calloc(1,sizeof(play_tree_parser_t));
if(!p)
return NULL;
p->stream = stream;
p->deep = deep;
p->keep = 1;
return p;
}
void
play_tree_parser_free(play_tree_parser_t* p) {
#ifdef MP_DEBUG
assert(p != NULL);
#endif
if(p->buffer) free(p->buffer);
if(p->line) free(p->line);
free(p);
}
play_tree_t*
play_tree_parser_get_play_tree(play_tree_parser_t* p) {
play_tree_t* tree = NULL;
#ifdef MP_DEBUG
assert(p != NULL);
#endif
while(play_tree_parser_get_line(p) != NULL) {
play_tree_parser_reset(p);
tree = parse_asx(p);
if(tree) break;
play_tree_parser_reset(p);
tree = parse_pls(p);
if(tree) break;
play_tree_parser_reset(p);
// Here come the others formats ( textplain must stay the last one )
tree = parse_textplain(p);
if(tree) break;
break;
}
if(tree)
mp_msg(MSGT_PLAYTREE,MSGL_V,"Playlist succefully parsed\n");
else mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Error while parsing playlist\n");
if(tree)
tree = play_tree_cleanup(tree);
if(!tree) mp_msg(MSGT_PLAYTREE,MSGL_WARN,"Warning empty playlist\n");
return tree;
}