/* TODO: Support offset > INT64_MAX */
int64_t lsmash_bs_read_seek( lsmash_bs_t *bs, int64_t offset, int whence )
{
if( whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END )
return LSMASH_ERR_FUNCTION_PARAM;
if( whence == SEEK_CUR )
offset -= lsmash_bs_get_remaining_buffer_size( bs );
/* Check whether we can seek on the buffer. */
if( !bs->buffer.unseekable )
{
assert( bs->offset >= bs->buffer.store );
uint64_t dst_offset = bs_estimate_seek_offset( bs, offset, whence );
uint64_t offset_s = bs->offset - bs->buffer.store;
uint64_t offset_e = bs->offset;
if( bs->unseekable || (dst_offset >= offset_s && dst_offset < offset_e) )
{
/* OK, we can. So, seek on the buffer. */
bs->buffer.pos = dst_offset - offset_s;
bs->eob = 0;
return lsmash_bs_get_stream_pos( bs );
}
}
if( bs->unseekable )
return LSMASH_ERR_NAMELESS;
/* Try to seek the stream. */
int64_t ret = bs->seek( bs->stream, offset, whence );
if( ret < 0 )
return ret;
bs->offset = ret;
bs->written = LSMASH_MAX( bs->written, bs->offset );
bs->eof = 0;
bs->eob = 0;
/* The data on the buffer is invalid. */
lsmash_bs_empty( bs );
return ret;
}
/* TODO: Support offset > INT64_MAX */
int64_t lsmash_bs_write_seek( lsmash_bs_t *bs, int64_t offset, int whence )
{
if( bs->unseekable || (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) )
return -1;
/* Try to seek the stream. */
int64_t ret = bs->seek( bs->stream, offset, whence );
if( ret < 0 )
return ret;
bs->offset = bs_estimate_seek_offset( bs, offset, whence );
bs->eof = 0;
bs->eob = 0;
return ret;
}
/* TODO: Support offset > INT64_MAX */
int64_t lsmash_bs_write_seek( lsmash_bs_t *bs, int64_t offset, int whence )
{
if( bs->unseekable )
return LSMASH_ERR_NAMELESS;
if( whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END )
return LSMASH_ERR_FUNCTION_PARAM;
/* Try to seek the stream. */
int64_t ret = bs->seek( bs->stream, offset, whence );
if( ret < 0 )
return ret;
bs->offset = bs_estimate_seek_offset( bs, offset, whence );
bs->eof = 0;
bs->eob = 0;
return ret;
}
