mpd/src/tag.c

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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tag.h"
#include "tag_pool.h"
#include "myfprintf.h"
#include "utils.h"
#include "utf8.h"
#include "log.h"
#include "conf.h"
#include "tagTracker.h"
#include "song.h"
const char *mpdTagItemKeys[TAG_NUM_OF_ITEM_TYPES] = {
"Artist",
"Album",
"Title",
"Track",
"Name",
"Genre",
"Date",
"Composer",
"Performer",
"Comment",
"Disc"
};
static mpd_sint8 ignoreTagItems[TAG_NUM_OF_ITEM_TYPES];
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void tag_lib_init(void)
{
int quit = 0;
char *temp;
char *s;
char *c;
ConfigParam *param;
int i;
/* parse the "metadata_to_use" config parameter below */
memset(ignoreTagItems, 0, TAG_NUM_OF_ITEM_TYPES);
ignoreTagItems[TAG_ITEM_COMMENT] = 1; /* ignore comments by default */
param = getConfigParam(CONF_METADATA_TO_USE);
if (!param)
return;
memset(ignoreTagItems, 1, TAG_NUM_OF_ITEM_TYPES);
if (0 == strcasecmp(param->value, "none"))
return;
temp = c = s = xstrdup(param->value);
while (!quit) {
if (*s == ',' || *s == '\0') {
if (*s == '\0')
quit = 1;
*s = '\0';
for (i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++) {
if (strcasecmp(c, mpdTagItemKeys[i]) == 0) {
ignoreTagItems[i] = 0;
break;
}
}
if (strlen(c) && i == TAG_NUM_OF_ITEM_TYPES) {
FATAL("error parsing metadata item \"%s\" at "
"line %i\n", c, param->line);
}
s++;
c = s;
}
s++;
}
free(temp);
}
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void tag_print_types(int fd)
{
int i;
for (i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++) {
if (ignoreTagItems[i] == 0)
fdprintf(fd, "tagtype: %s\n", mpdTagItemKeys[i]);
}
}
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void tag_print(int fd, struct tag *tag)
{
int i;
if (tag->time >= 0)
fdprintf(fd, SONG_TIME "%i\n", tag->time);
for (i = 0; i < tag->numOfItems; i++) {
fdprintf(fd, "%s: %s\n", mpdTagItemKeys[tag->items[i]->type],
tag->items[i]->value);
}
}
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struct tag *tag_ape_load(char *file)
{
struct tag *ret = NULL;
FILE *fp;
int tagCount;
char *buffer = NULL;
char *p;
size_t tagLen;
size_t size;
unsigned long flags;
int i;
char *key;
struct {
unsigned char id[8];
unsigned char version[4];
unsigned char length[4];
unsigned char tagCount[4];
unsigned char flags[4];
unsigned char reserved[8];
} footer;
const char *apeItems[7] = {
"title",
"artist",
"album",
"comment",
"genre",
"track",
"year"
};
int tagItems[7] = {
TAG_ITEM_TITLE,
TAG_ITEM_ARTIST,
TAG_ITEM_ALBUM,
TAG_ITEM_COMMENT,
TAG_ITEM_GENRE,
TAG_ITEM_TRACK,
TAG_ITEM_DATE,
};
fp = fopen(file, "r");
if (!fp)
return NULL;
/* determine if file has an apeV2 tag */
if (fseek(fp, 0, SEEK_END))
goto fail;
size = (size_t)ftell(fp);
if (fseek(fp, size - sizeof(footer), SEEK_SET))
goto fail;
if (fread(&footer, 1, sizeof(footer), fp) != sizeof(footer))
goto fail;
if (memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0)
goto fail;
if (readLEuint32(footer.version) != 2000)
goto fail;
/* find beginning of ape tag */
tagLen = readLEuint32(footer.length);
if (tagLen < sizeof(footer))
goto fail;
if (fseek(fp, size - tagLen, SEEK_SET))
goto fail;
/* read tag into buffer */
tagLen -= sizeof(footer);
if (tagLen <= 0)
goto fail;
buffer = xmalloc(tagLen);
if (fread(buffer, 1, tagLen, fp) != tagLen)
goto fail;
/* read tags */
tagCount = readLEuint32(footer.tagCount);
p = buffer;
while (tagCount-- && tagLen > 10) {
size = readLEuint32((unsigned char *)p);
p += 4;
tagLen -= 4;
flags = readLEuint32((unsigned char *)p);
p += 4;
tagLen -= 4;
/* get the key */
key = p;
while (tagLen - size > 0 && *p != '\0') {
p++;
tagLen--;
}
p++;
tagLen--;
/* get the value */
if (tagLen < size)
goto fail;
/* we only care about utf-8 text tags */
if (!(flags & (0x3 << 1))) {
for (i = 0; i < 7; i++) {
if (strcasecmp(key, apeItems[i]) == 0) {
if (!ret)
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ret = tag_new();
tag_add_item_n(ret, tagItems[i],
p, size);
}
}
}
p += size;
tagLen -= size;
}
fail:
if (fp)
fclose(fp);
if (buffer)
free(buffer);
return ret;
}
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struct tag *tag_new(void)
{
struct tag *ret = xmalloc(sizeof(*ret));
ret->items = NULL;
ret->time = -1;
ret->numOfItems = 0;
return ret;
}
static void deleteItem(struct tag *tag, int idx)
{
assert(idx < tag->numOfItems);
tag->numOfItems--;
tag_pool_put_item(tag->items[idx]);
/* free(tag->items[idx].value); */
if (tag->numOfItems - idx > 0) {
memmove(tag->items + idx, tag->items + idx + 1,
tag->numOfItems - idx);
}
if (tag->numOfItems > 0) {
tag->items = xrealloc(tag->items,
tag->numOfItems * sizeof(*tag->items));
} else {
free(tag->items);
tag->items = NULL;
}
}
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void tag_clear_items_by_type(struct tag *tag, enum tag_type type)
{
int i;
for (i = 0; i < tag->numOfItems; i++) {
if (tag->items[i]->type == type) {
deleteItem(tag, i);
/* decrement since when just deleted this node */
i--;
}
}
}
static void clearMpdTag(struct tag *tag)
{
int i;
for (i = 0; i < tag->numOfItems; i++) {
/* free(tag->items[i].value); */
tag_pool_put_item(tag->items[i]);
}
if (tag->items)
free(tag->items);
tag->items = NULL;
tag->numOfItems = 0;
tag->time = -1;
}
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void tag_free(struct tag *tag)
{
clearMpdTag(tag);
free(tag);
}
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struct tag *tag_dup(struct tag *tag)
{
struct tag *ret;
int i;
if (!tag)
return NULL;
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ret = tag_new();
ret->time = tag->time;
for (i = 0; i < tag->numOfItems; i++) {
tag_add_item(ret, tag->items[i]->type, tag->items[i]->value);
}
return ret;
}
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int tag_equal(struct tag *tag1, struct tag *tag2)
{
int i;
if (tag1 == NULL && tag2 == NULL)
return 1;
else if (!tag1 || !tag2)
return 0;
if (tag1->time != tag2->time)
return 0;
if (tag1->numOfItems != tag2->numOfItems)
return 0;
for (i = 0; i < tag1->numOfItems; i++) {
if (tag1->items[i]->type != tag2->items[i]->type)
return 0;
if (strcmp(tag1->items[i]->value, tag2->items[i]->value)) {
return 0;
}
}
return 1;
}
static inline const char *fix_utf8(const char *str, size_t *length_r) {
const char *temp;
assert(str != NULL);
if (validUtf8String(str, *length_r))
return str;
DEBUG("not valid utf8 in tag: %s\n",str);
temp = latin1StrToUtf8Dup(str);
*length_r = strlen(temp);
return temp;
}
static void appendToTagItems(struct tag *tag, enum tag_type type,
const char *value, size_t len)
{
unsigned int i = tag->numOfItems;
const char *p;
p = fix_utf8(value, &len);
if (memchr(p, '\n', len) != NULL) {
char *duplicated = xmalloc(len + 1);
memcpy(duplicated, p, len);
duplicated[len] = '\0';
if (p != value)
xfree(p);
stripReturnChar(duplicated);
p = duplicated;
}
tag->numOfItems++;
tag->items = xrealloc(tag->items,
tag->numOfItems * sizeof(*tag->items));
tag->items[i] = tag_pool_get_item(type, p, len);
if (p != value)
xfree(p);
}
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void tag_add_item_n(struct tag *tag, enum tag_type itemType,
const char *value, size_t len)
{
if (ignoreTagItems[itemType])
{
return;
}
if (!value || !len)
return;
/* we can't hold more than 255 items */
if (tag->numOfItems == 255)
return;
appendToTagItems(tag, itemType, value, len);
}