static long check_opus_header(DB_FILE *in, ogg_sync_state *oy, const off_t offset, char **vendor)
{
ogg_stream_state os;
ogg_page og;
const int64_t serial = init_read_stream(in, oy, &os, &og, offset, OPUSNAME);
if (serial <= OGGEDIT_EOF)
return serial;
ogg_packet op;
const long pages = read_packet(in, oy, &os, &og, &op, 1);
ogg_stream_clear(&os);
if (pages <= OGGEDIT_EOF)
return pages;
if (op.bytes > strlen(TAGMAGIC) && !memcmp(op.packet, TAGMAGIC, strlen(TAGMAGIC)))
*vendor = parse_vendor(&op, strlen(TAGMAGIC));
free(op.packet);
if (!*vendor)
return OGGEDIT_CANNOT_PARSE_HEADERS;
#ifdef HAVE_OGG_STREAM_FLUSH_FILL
if (op.bytes < MAXPAYLOAD * (pages-1))
return 4; // prevent in-place write if the packet is weirdly split into too many pages
#else
return 4; // not safe to pad without ogg_stream_flush_fill
#endif
return op.bytes;
}
static ptrdiff_t check_vorbis_headers(DB_FILE *in, ogg_sync_state *oy, const off_t offset, char **vendor, ogg_packet *codebooks)
{
ogg_stream_state os;
ogg_page og;
const int64_t serial = init_read_stream(in, oy, &os, &og, offset, VORBISNAME);
if (serial <= OGGEDIT_EOF)
return serial;
ogg_packet vc;
int pages = read_packet(in, oy, &os, &og, &vc, 1);
if (pages > OGGEDIT_EOF)
pages = read_packet(in, oy, &os, &og, codebooks, pages);
ogg_stream_clear(&os);
if (pages <= OGGEDIT_EOF)
return pages;
if (vc.bytes > strlen(VCMAGIC) && !memcmp(vc.packet, VCMAGIC, strlen(VCMAGIC)) &&
codebooks->bytes > strlen(CODEMAGIC) && !memcmp(codebooks->packet, CODEMAGIC, strlen(CODEMAGIC)))
*vendor = parse_vendor(&vc, strlen(VCMAGIC));
free(vc.packet);
if (!*vendor)
return OGGEDIT_CANNOT_PARSE_HEADERS;
#ifdef HAVE_OGG_STREAM_FLUSH_FILL
if ((vc.bytes + codebooks->bytes) < MAXPAYLOAD * (pages-1))
return 4; // prevent in-place write if the packets are split over too many pages
#else
return 4; // not safe to pad without ogg_stream_flush_fill
#endif
return vc.bytes;
}
int main()
{
/*
* Status of debugging work so far is that everything up to
* decoding the tree from result is more-or-less working.
* Possible places of errors:
* *) maybe no writes in the compressed file after the tree?
* *) maybe no reads from the compressed file after the tree?
*
* The best would be to manually search this guy.
*/
BitStream *reader = init_read_stream("compressed_test.txt");
BitStream *writer = init_write_stream("re-test.txt");
huffman_decode_file(reader, writer);
close_stream(reader);
close_stream(writer);
}
