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mpd/src/tag.c
Max Kellermann 27f12c173d use size_t 
When dealing with in-memory lengths, the standard type "size_t" should
be used.  Missing one can be quite dangerous, because an attacker
could provoke an integer under-/overflow, which may provide an attack
vector.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7205 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-03-26 10:38:07 +00:00

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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 "path.h"
#include "myfprintf.h"
#include "utils.h"
#include "utf8.h"
#include "log.h"
#include "inputStream.h"
#include "conf.h"
#include "charConv.h"
#include "tagTracker.h"
#include "mpd_types.h"
#include "gcc.h"
#include "song.h"
#include "os_compat.h"
#ifdef HAVE_ID3TAG
# define isId3v1(tag) (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1)
# ifndef ID3_FRAME_COMPOSER
# define ID3_FRAME_COMPOSER "TCOM"
# endif
# ifndef ID3_FRAME_PERFORMER
# define ID3_FRAME_PERFORMER "TOPE"
# endif
# ifndef ID3_FRAME_DISC
# define ID3_FRAME_DISC "TPOS"
# endif
#endif
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];
void initTagConfig(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);
}
void printTagTypes(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]);
}
}
void printMpdTag(int fd, MpdTag * 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);
}
}
#ifdef HAVE_ID3TAG
/* This will try to convert a string to utf-8,
*/
static id3_utf8_t * processID3FieldString (int is_id3v1, const id3_ucs4_t *ucs4, int type)
{
id3_utf8_t *utf8;
id3_latin1_t *isostr;
char *encoding;
if (type == TAG_ITEM_GENRE)
ucs4 = id3_genre_name(ucs4);
/* use encoding field here? */
if (is_id3v1 &&
(encoding = getConfigParamValue(CONF_ID3V1_ENCODING))) {
isostr = id3_ucs4_latin1duplicate(ucs4);
if (mpd_unlikely(!isostr)) {
return NULL;
}
setCharSetConversion("UTF-8", encoding);
utf8 = xmalloc(strlen((char *)isostr) + 1);
utf8 = (id3_utf8_t *)char_conv_str((char *)utf8, (char *)isostr);
if (!utf8) {
DEBUG("Unable to convert %s string to UTF-8: "
"'%s'\n", encoding, isostr);
free(isostr);
return NULL;
}
free(isostr);
} else {
utf8 = id3_ucs4_utf8duplicate(ucs4);
if (mpd_unlikely(!utf8)) {
return NULL;
}
}
return utf8;
}
static MpdTag *getID3Info(
struct id3_tag *tag, const char *id, int type, MpdTag * mpdTag)
{
struct id3_frame const *frame;
id3_ucs4_t const *ucs4;
id3_utf8_t *utf8;
union id3_field const *field;
unsigned int nstrings;
int i;
frame = id3_tag_findframe(tag, id, 0);
/* Check frame */
if (!frame)
{
return mpdTag;
}
/* Check fields in frame */
if(frame->nfields == 0)
{
DEBUG(__FILE__": Frame has no fields\n");
return mpdTag;
}
/* Starting with T is a stringlist */
if (id[0] == 'T')
{
/* This one contains 2 fields:
* 1st: Text encoding
* 2: Stringlist
* Shamefully this isn't the RL case.
* But I am going to enforce it anyway.
*/
if(frame->nfields != 2)
{
DEBUG(__FILE__": Invalid number '%i' of fields for TXX frame\n",frame->nfields);
return mpdTag;
}
field = &frame->fields[0];
/**
* First field is encoding field.
* This is ignored by mpd.
*/
if(field->type != ID3_FIELD_TYPE_TEXTENCODING)
{
DEBUG(__FILE__": Expected encoding, found: %i\n",field->type);
}
/* Process remaining fields, should be only one */
field = &frame->fields[1];
/* Encoding field */
if(field->type == ID3_FIELD_TYPE_STRINGLIST) {
/* Get the number of strings available */
nstrings = id3_field_getnstrings(field);
for (i = 0; i < nstrings; i++) {
ucs4 = id3_field_getstrings(field,i);
if(!ucs4)
continue;
utf8 = processID3FieldString(isId3v1(tag),ucs4, type);
if(!utf8)
continue;
if (mpdTag == NULL)
mpdTag = newMpdTag();
addItemToMpdTag(mpdTag, type, (char *)utf8);
free(utf8);
}
}
else {
ERROR(__FILE__": Field type not processed: %i\n",(int)id3_field_gettextencoding(field));
}
}
/* A comment frame */
else if(!strcmp(ID3_FRAME_COMMENT, id))
{
/* A comment frame is different... */
/* 1st: encoding
* 2nd: Language
* 3rd: String
* 4th: FullString.
* The 'value' we want is in the 4th field
*/
if(frame->nfields == 4)
{
/* for now I only read the 4th field, with the fullstring */
field = &frame->fields[3];
if(field->type == ID3_FIELD_TYPE_STRINGFULL)
{
ucs4 = id3_field_getfullstring(field);
if(ucs4)
{
utf8 = processID3FieldString(isId3v1(tag),ucs4, type);
if(utf8)
{
if (mpdTag == NULL)
mpdTag = newMpdTag();
addItemToMpdTag(mpdTag, type, (char *)utf8);
free(utf8);
}
}
}
else
{
DEBUG(__FILE__": 4th field in comment frame differs from expected, got '%i': ignoring\n",field->type);
}
}
else
{
DEBUG(__FILE__": Invalid 'comments' tag, got '%i' fields instead of 4\n", frame->nfields);
}
}
/* Unsupported */
else {
DEBUG(__FILE__": Unsupported tag type requrested\n");
return mpdTag;
}
return mpdTag;
}
#endif
#ifdef HAVE_ID3TAG
MpdTag *parseId3Tag(struct id3_tag * tag)
{
MpdTag *ret = NULL;
ret = getID3Info(tag, ID3_FRAME_ARTIST, TAG_ITEM_ARTIST, ret);
ret = getID3Info(tag, ID3_FRAME_TITLE, TAG_ITEM_TITLE, ret);
ret = getID3Info(tag, ID3_FRAME_ALBUM, TAG_ITEM_ALBUM, ret);
ret = getID3Info(tag, ID3_FRAME_TRACK, TAG_ITEM_TRACK, ret);
ret = getID3Info(tag, ID3_FRAME_YEAR, TAG_ITEM_DATE, ret);
ret = getID3Info(tag, ID3_FRAME_GENRE, TAG_ITEM_GENRE, ret);
ret = getID3Info(tag, ID3_FRAME_COMPOSER, TAG_ITEM_COMPOSER, ret);
ret = getID3Info(tag, ID3_FRAME_PERFORMER, TAG_ITEM_PERFORMER, ret);
ret = getID3Info(tag, ID3_FRAME_COMMENT, TAG_ITEM_COMMENT, ret);
ret = getID3Info(tag, ID3_FRAME_DISC, TAG_ITEM_DISC, ret);
return ret;
}
#endif
#ifdef HAVE_ID3TAG
static int fillBuffer(void *buf, size_t size, FILE * stream,
long offset, int whence)
{
if (fseek(stream, offset, whence) != 0) return 0;
return fread(buf, 1, size, stream);
}
#endif
#ifdef HAVE_ID3TAG
static int getId3v2FooterSize(FILE * stream, long offset, int whence)
{
id3_byte_t buf[ID3_TAG_QUERYSIZE];
int bufsize;
bufsize = fillBuffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
if (bufsize <= 0) return 0;
return id3_tag_query(buf, bufsize);
}
#endif
#ifdef HAVE_ID3TAG
static struct id3_tag *getId3Tag(FILE * stream, long offset, int whence)
{
struct id3_tag *tag;
id3_byte_t queryBuf[ID3_TAG_QUERYSIZE];
id3_byte_t *tagBuf;
int tagSize;
int queryBufSize;
int tagBufSize;
/* It's ok if we get less than we asked for */
queryBufSize = fillBuffer(queryBuf, ID3_TAG_QUERYSIZE,
stream, offset, whence);
if (queryBufSize <= 0) return NULL;
/* Look for a tag header */
tagSize = id3_tag_query(queryBuf, queryBufSize);
if (tagSize <= 0) return NULL;
/* Found a tag. Allocate a buffer and read it in. */
tagBuf = xmalloc(tagSize);
if (!tagBuf) return NULL;
tagBufSize = fillBuffer(tagBuf, tagSize, stream, offset, whence);
if (tagBufSize < tagSize) {
free(tagBuf);
return NULL;
}
tag = id3_tag_parse(tagBuf, tagBufSize);
free(tagBuf);
return tag;
}
#endif
#ifdef HAVE_ID3TAG
static struct id3_tag *findId3TagFromBeginning(FILE * stream)
{
struct id3_tag *tag;
struct id3_tag *seektag;
struct id3_frame *frame;
int seek;
tag = getId3Tag(stream, 0, SEEK_SET);
if (!tag) {
return NULL;
} else if (isId3v1(tag)) {
/* id3v1 tags don't belong here */
id3_tag_delete(tag);
return NULL;
}
/* We have an id3v2 tag, so let's look for SEEK frames */
while ((frame = id3_tag_findframe(tag, "SEEK", 0))) {
/* Found a SEEK frame, get it's value */
seek = id3_field_getint(id3_frame_field(frame, 0));
if (seek < 0)
break;
/* Get the tag specified by the SEEK frame */
seektag = getId3Tag(stream, seek, SEEK_CUR);
if (!seektag || isId3v1(seektag))
break;
/* Replace the old tag with the new one */
id3_tag_delete(tag);
tag = seektag;
}
return tag;
}
#endif
#ifdef HAVE_ID3TAG
static struct id3_tag *findId3TagFromEnd(FILE * stream)
{
struct id3_tag *tag;
struct id3_tag *v1tag;
int tagsize;
/* Get an id3v1 tag from the end of file for later use */
v1tag = getId3Tag(stream, -128, SEEK_END);
/* Get the id3v2 tag size from the footer (located before v1tag) */
tagsize = getId3v2FooterSize(stream, (v1tag ? -128 : 0) - 10, SEEK_END);
if (tagsize >= 0)
return v1tag;
/* Get the tag which the footer belongs to */
tag = getId3Tag(stream, tagsize, SEEK_CUR);
if (!tag)
return v1tag;
/* We have an id3v2 tag, so ditch v1tag */
id3_tag_delete(v1tag);
return tag;
}
#endif
MpdTag *id3Dup(char *file)
{
MpdTag *ret = NULL;
#ifdef HAVE_ID3TAG
struct id3_tag *tag;
FILE *stream;
stream = fopen(file, "r");
if (!stream) {
DEBUG("id3Dup: Failed to open file: '%s', %s\n", file,
strerror(errno));
return NULL;
}
tag = findId3TagFromBeginning(stream);
if (!tag)
tag = findId3TagFromEnd(stream);
fclose(stream);
if (!tag)
return NULL;
ret = parseId3Tag(tag);
id3_tag_delete(tag);
#endif
return ret;
}
MpdTag *apeDup(char *file)
{
MpdTag *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)
ret = newMpdTag();
addItemToMpdTagWithLen(ret, tagItems[i],
p, size);
}
}
}
p += size;
tagLen -= size;
}
fail:
if (fp)
fclose(fp);
if (buffer)
free(buffer);
return ret;
}
MpdTag *newMpdTag(void)
{
MpdTag *ret = xmalloc(sizeof(MpdTag));
ret->items = NULL;
ret->time = -1;
ret->numOfItems = 0;
return ret;
}
static void deleteItem(MpdTag * tag, int idx)
{
assert(idx < tag->numOfItems);
tag->numOfItems--;
removeTagItemString(tag->items[idx].type, tag->items[idx].value);
/* 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(MpdTagItem));
} else {
free(tag->items);
tag->items = NULL;
}
}
void clearItemsFromMpdTag(MpdTag * tag, int 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(MpdTag * tag)
{
int i;
for (i = 0; i < tag->numOfItems; i++) {
removeTagItemString(tag->items[i].type, tag->items[i].value);
/* free(tag->items[i].value); */
}
if (tag->items)
free(tag->items);
tag->items = NULL;
tag->numOfItems = 0;
tag->time = -1;
}
void freeMpdTag(MpdTag * tag)
{
clearMpdTag(tag);
free(tag);
}
MpdTag *mpdTagDup(MpdTag * tag)
{
MpdTag *ret;
int i;
if (!tag)
return NULL;
ret = newMpdTag();
ret->time = tag->time;
for (i = 0; i < tag->numOfItems; i++) {
addItemToMpdTag(ret, tag->items[i].type, tag->items[i].value);
}
return ret;
}
int mpdTagsAreEqual(MpdTag * tag1, MpdTag * 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;
}
#define fixUtf8(str) { \
if(str && !validUtf8String(str)) { \
char * temp; \
DEBUG("not valid utf8 in tag: %s\n",str); \
temp = latin1StrToUtf8Dup(str); \
free(str); \
str = temp; \
} \
}
static void appendToTagItems(MpdTag * tag, int type, char *value, int len)
{
int i = tag->numOfItems;
char *duplicated = xmalloc(len + 1);
memcpy(duplicated, value, len);
duplicated[len] = '\0';
fixUtf8(duplicated);
stripReturnChar(duplicated);
tag->numOfItems++;
tag->items = xrealloc(tag->items, tag->numOfItems * sizeof(MpdTagItem));
tag->items[i].type = type;
tag->items[i].value = getTagItemString(type, duplicated);
free(duplicated);
}
void addItemToMpdTagWithLen(MpdTag * tag, int itemType, char *value, int 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);
}
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