static bool_t read_frame (VFSFile * handle, int max_size, int version,
bool_t syncsafe, int * frame_size, char * key, char * * data, int * size)
{
ID3v2FrameHeader header;
int skip = 0;
if ((max_size -= sizeof (ID3v2FrameHeader)) < 0)
return FALSE;
if (vfs_fread (& header, 1, sizeof (ID3v2FrameHeader), handle) != sizeof
(ID3v2FrameHeader))
return FALSE;
if (! header.key[0]) /* padding */
return FALSE;
header.size = (version == 3) ? GUINT32_FROM_BE (header.size) : unsyncsafe32
(GUINT32_FROM_BE (header.size));
header.flags = GUINT16_FROM_BE (header.flags);
if (header.size > max_size || header.size == 0)
return FALSE;
TAGDBG ("Found frame:\n");
TAGDBG (" key = %.4s\n", header.key);
TAGDBG (" size = %d\n", (int) header.size);
TAGDBG (" flags = %x\n", (int) header.flags);
* frame_size = sizeof (ID3v2FrameHeader) + header.size;
g_strlcpy (key, header.key, 5);
if (header.flags & (ID3_FRAME_COMPRESSED | ID3_FRAME_ENCRYPTED))
{
TAGDBG ("Hit compressed/encrypted frame %s.\n", key);
return FALSE;
}
if (header.flags & ID3_FRAME_HAS_GROUP)
skip ++;
if (header.flags & ID3_FRAME_HAS_LENGTH)
skip += 4;
if ((skip > 0 && vfs_fseek (handle, skip, SEEK_CUR)) || skip >= header.size)
return FALSE;
* size = header.size - skip;
* data = g_malloc (* size);
if (vfs_fread (* data, 1, * size, handle) != * size)
return FALSE;
if (syncsafe || (header.flags & ID3_FRAME_SYNCSAFE))
* size = unsyncsafe (* data, * size);
TAGDBG ("Data size = %d.\n", * size);
return TRUE;
}
static bool_t skip_extended_header_4 (VFSFile * handle, int * _size)
{
uint32_t size;
if (vfs_fread (& size, 1, 4, handle) != 4)
return FALSE;
size = unsyncsafe32 (GUINT32_FROM_BE (size));
TAGDBG ("Found v2.4 extended header, size = %d.\n", (int) size);
if (vfs_fseek (handle, size - 4, SEEK_CUR))
return FALSE;
* _size = size;
return TRUE;
}
static gboolean validate_header (ID3v2Header * header)
{
if (memcmp (header->magic, "ID3", 3))
return FALSE;
if ((header->version != 2))
return FALSE;
header->size = unsyncsafe32(GUINT32_FROM_BE(header->size));
TAGDBG ("Found ID3v2 header:\n");
TAGDBG (" magic = %.3s\n", header->magic);
TAGDBG (" version = %d\n", (gint) header->version);
TAGDBG (" revision = %d\n", (gint) header->revision);
TAGDBG (" flags = %x\n", (gint) header->flags);
TAGDBG (" size = %d\n", (gint) header->size);
return TRUE;
}
static bool_t validate_header (ID3v2Header * header, bool_t is_footer)
{
if (memcmp (header->magic, is_footer ? "3DI" : "ID3", 3))
return FALSE;
if ((header->version != 3 && header->version != 4) || header->revision != 0)
return FALSE;
header->size = unsyncsafe32 (GUINT32_FROM_BE (header->size));
TAGDBG ("Found ID3v2 %s:\n", is_footer ? "footer" : "header");
TAGDBG (" magic = %.3s\n", header->magic);
TAGDBG (" version = %d\n", (int) header->version);
TAGDBG (" revision = %d\n", (int) header->revision);
TAGDBG (" flags = %x\n", (int) header->flags);
TAGDBG (" size = %d\n", (int) header->size);
return TRUE;
}
