size_t MemoryWriteStreamDynamic::seek(ptrdiff_t offset, SeekableWriteStream::Origin whence) {
assert((size_t)pos() <= _size);
const size_t oldPos = pos();
const size_t newPos = evalSeek(offset, whence, pos(), 0, size());
if (newPos > _size)
throw Exception(kSeekError);
_ptr = _data.get() + newPos;
return oldPos;
}
size_t MemoryWriteStream::seek(ptrdiff_t offset, SeekableWriteStream::Origin whence) {
assert((size_t)_pos <= _bufSize);
const size_t oldPos = _pos;
const size_t newPos = evalSeek(offset, whence, _pos, 0, size());
if (newPos > _bufSize)
throw Exception(kSeekError);
_pos = newPos;
_ptr = _ptr - oldPos + newPos;
return oldPos;
}
size_t SeekableSubReadStream::seek(ptrdiff_t offset, Origin whence) {
assert(_pos >= _begin);
assert(_pos <= _end);
const size_t oldPos = _pos;
const size_t newPos = evalSeek(offset, whence, _pos, _begin, size());
if ((newPos < _begin) || (newPos > _end))
throw Exception(kSeekError);
_pos = newPos;
_parentStream->seek(_pos);
_eos = false; // reset eos on successful seek
return oldPos;
}
size_t MemoryReadStream::seek(ptrdiff_t offset, Origin whence) {
assert((size_t)_pos <= _size);
const size_t oldPos = _pos;
const size_t newPos = evalSeek(offset, whence, _pos, 0, size());
if (newPos > _size)
throw Exception(kSeekError);
_pos = newPos;
_ptr = _ptrOrig.get() + newPos;
// Reset end-of-stream flag on a successful seek
_eos = false;
return oldPos;
}
