int
oggz_comments_copy (OGGZ * src, long src_serialno,
OGGZ * dest, long dest_serialno)
{
const OggzComment * comment;
if (src == NULL || dest == NULL) return OGGZ_ERR_BAD_OGGZ;
if (dest->flags & OGGZ_WRITE) {
if (OGGZ_CONFIG_WRITE) {
oggz_comment_set_vendor (dest, dest_serialno,
oggz_comment_get_vendor (src, src_serialno));
for (comment = oggz_comment_first (src, src_serialno); comment;
comment = oggz_comment_next (src, src_serialno, comment)) {
oggz_comment_add (dest, dest_serialno, comment);
}
} else {
return OGGZ_ERR_DISABLED;
}
} else {
return OGGZ_ERR_INVALID;
}
return 0;
}
long
oggz_comments_encode (OGGZ * oggz, long serialno,
unsigned char * buf, long length)
{
oggz_stream_t * stream;
char * c = (char *)buf;
const OggzComment * comment;
int nb_fields = 0, vendor_length = 0, field_length;
long actual_length, remaining = length;
stream = oggz_get_stream (oggz, serialno);
if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
/* Vendor string */
if (stream->vendor)
vendor_length = strlen (stream->vendor);
actual_length = 4 + vendor_length;
#ifdef DEBUG
printf ("oggz_comments_encode: vendor = %s\n", stream->vendor);
#endif
/* user comment list length */
actual_length += 4;
for (comment = oggz_comment_first (oggz, serialno); comment;
comment = oggz_comment_next (oggz, serialno, comment)) {
actual_length += 4 + strlen (comment->name); /* [size]"name" */
if (comment->value)
actual_length += 1 + strlen (comment->value); /* "=value" */
#ifdef DEBUG
printf ("oggz_comments_encode: %s = %s\n",
comment->name, comment->value);
#endif
nb_fields++;
}
actual_length++; /* framing bit */
if (buf == NULL) return actual_length;
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, vendor_length);
c += 4;
if (stream->vendor) {
field_length = strlen (stream->vendor);
memcpy (c, stream->vendor, MIN (field_length, remaining));
c += field_length;
remaining -= field_length;
if (remaining <= 0 ) return actual_length;
}
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, nb_fields);
c += 4;
for (comment = oggz_comment_first (oggz, serialno); comment;
comment = oggz_comment_next (oggz, serialno, comment)) {
field_length = strlen (comment->name); /* [size]"name" */
if (comment->value)
field_length += 1 + strlen (comment->value); /* "=value" */
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, field_length);
c += 4;
field_length = strlen (comment->name);
memcpy (c, comment->name, MIN (field_length, remaining));
c += field_length;
remaining -= field_length;
if (remaining <= 0) return actual_length;
if (comment->value) {
remaining --;
if (remaining <= 0) return actual_length;
*c = '=';
c++;
field_length = strlen (comment->value);
memcpy (c, comment->value, MIN (field_length, remaining));
c += field_length;
remaining -= field_length;
if (remaining <= 0) return actual_length;
}
}
if (remaining <= 0) return actual_length;
*c = 0x01;
return actual_length;
}
long
oggz_comments_encode (OGGZ * oggz, long serialno,
unsigned char * buf, long length)
{
oggz_stream_t * stream;
char * c = (char *)buf;
const OggzComment * comment;
int nb_fields = 0, vendor_length = 0;
unsigned long actual_length = 0, remaining = length, field_length;
/* Deal with sign of length first */
if (length < 0) return 0;
stream = oggz_get_stream (oggz, serialno);
if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
/* Vendor string */
if (stream->vendor)
vendor_length = oggz_comment_len (stream->vendor);
if (accum_length (&actual_length, 4 + vendor_length) == 0)
return 0;
#ifdef DEBUG
printf ("oggz_comments_encode: vendor = %s\n", stream->vendor);
#endif
/* user comment list length */
if (accum_length (&actual_length, 4) == 0)
return 0;
for (comment = oggz_comment_first (oggz, serialno); comment;
comment = oggz_comment_next (oggz, serialno, comment)) {
/* [size]"name" */
if (accum_length (&actual_length, 4 + oggz_comment_len (comment->name)) == 0)
return 0;
if (comment->value) {
/* "=value" */
if (accum_length (&actual_length, 1 + oggz_comment_len (comment->value)) == 0)
return 0;
}
#ifdef DEBUG
printf ("oggz_comments_encode: %s = %s\n",
comment->name, comment->value);
#endif
nb_fields++;
}
/* framing bit */
if (accum_length (&actual_length, 1) == 0)
return 0;
/* NB. actual_length is not modified from here onwards */
if (buf == NULL) return actual_length;
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, vendor_length);
c += 4;
if (stream->vendor) {
field_length = oggz_comment_len (stream->vendor);
memcpy (c, stream->vendor, MIN (field_length, remaining));
c += field_length; remaining -= field_length;
if (remaining <= 0) return actual_length;
}
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, nb_fields);
c += 4;
for (comment = oggz_comment_first (oggz, serialno); comment;
comment = oggz_comment_next (oggz, serialno, comment)) {
field_length = oggz_comment_len (comment->name); /* [size]"name" */
if (comment->value)
field_length += 1 + oggz_comment_len (comment->value); /* "=value" */
remaining -= 4;
if (remaining <= 0) return actual_length;
writeint (c, 0, field_length);
c += 4;
field_length = oggz_comment_len (comment->name);
memcpy (c, comment->name, MIN (field_length, remaining));
c += field_length; remaining -= field_length;
if (remaining <= 0) return actual_length;
if (comment->value) {
remaining --;
if (remaining <= 0) return actual_length;
*c = '=';
c++;
field_length = oggz_comment_len (comment->value);
memcpy (c, comment->value, MIN (field_length, remaining));
c += field_length; remaining -= field_length;
if (remaining <= 0) return actual_length;
}
}
if (remaining <= 0) return actual_length;
*c = 0x01;
return actual_length;
}
