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Added protection against too large ID3V2 tags

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1336 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-07-04 22:10:43 +00:00
parent 4744d3bcf0
commit c6de959f04
1 changed files with 17 additions and 19 deletions
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32
firmware/id3.c
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@ -40,9 +40,9 @@
#define BYTE2(x) ((x >> 8) & 0xFF)
#define BYTE3(x) ((x >> 0) & 0xFF)
#define UNSYNC(b1,b2,b3,b4) (((b1 & 0x7F) << (3*7)) + \
((b2 & 0x7F) << (2*7)) + \
((b3 & 0x7F) << (1*7)) + \
#define UNSYNC(b1,b2,b3,b4) (((b1 & 0x7F) << (3*7)) | \
((b2 & 0x7F) << (2*7)) | \
((b3 & 0x7F) << (1*7)) | \
((b4 & 0x7F) << (0*7)))
#define HASID3V2(entry) entry->id3v2len > 0
@ -111,8 +111,7 @@ stripspaces(char *buffer)
*
* Returns: true if a title was found and created, else false
*/
static bool
setid3v1title(int fd, struct mp3entry *entry)
static bool setid3v1title(int fd, struct mp3entry *entry)
{
char buffer[31];
int offsets[3] = {-95,-65,-125};
@ -156,8 +155,7 @@ setid3v1title(int fd, struct mp3entry *entry)
*
* Returns: true if a title was found and created, else false
*/
static void
setid3v2title(int fd, struct mp3entry *entry)
static void setid3v2title(int fd, struct mp3entry *entry)
{
unsigned int minframesize;
int size;
@ -292,8 +290,7 @@ setid3v2title(int fd, struct mp3entry *entry)
*
* Returns: the size of the tag or 0 if none was found
*/
static int
getid3v2len(int fd)
static int getid3v2len(int fd)
{
char buf[6];
int offset;
@ -303,6 +300,7 @@ getid3v2len(int fd)
(read(fd, buf, 6) != 6) ||
(strncmp(buf, "ID3", strlen("ID3")) != 0))
offset = 0;
/* Now check what the ID3v2 size field says */
else if(read(fd, buf, 4) != 4)
offset = 0;
@ -312,8 +310,7 @@ getid3v2len(int fd)
return offset;
}
static int
getfilesize(int fd)
static int getfilesize(int fd)
{
int size;
@ -332,8 +329,7 @@ getfilesize(int fd)
*
* Returns: the size of the tag or 0 if none was found
*/
static int
getid3v1len(int fd)
static int getid3v1len(int fd)
{
char buf[3];
int offset;
@ -363,8 +359,7 @@ getid3v1len(int fd)
* Returns: the song length in milliseconds,
* -1 means that it couldn't be calculated
*/
static int
getsonglength(int fd, struct mp3entry *entry)
static int getsonglength(int fd, struct mp3entry *entry)
{
unsigned int filetime = 0;
unsigned long header=0;
@ -530,8 +525,7 @@ getsonglength(int fd, struct mp3entry *entry)
*
* Returns: void
*/
bool
mp3info(struct mp3entry *entry, char *filename)
bool mp3info(struct mp3entry *entry, char *filename)
{
int fd;
fd = open(filename, O_RDONLY);
@ -547,6 +541,10 @@ mp3info(struct mp3entry *entry, char *filename)
entry->id3v2len = getid3v2len(fd);
entry->tracknum = 0;
/* Ignore the tag if it is too big */
if(entry->id3v2len > sizeof(entry->id3v2buf))
entry->id3v2len = 0;
if(HASID3V2(entry))
setid3v2title(fd, entry);
entry->length = getsonglength(fd, entry);