void MemoryStream::seek(int64 offset, int whence)
{
int64 new_position;
switch(whence)
{
case SEEK_SET:
new_position = offset;
break;
case SEEK_CUR:
new_position = position + offset;
break;
case SEEK_END:
new_position = data_buffer_size + offset;
break;
}
if(new_position < 0)
throw MDFN_Error(ErrnoHolder(EINVAL));
else
grow_if_necessary(new_position);
position = new_position;
}
RQ_EXPORT void
rq_array_push_back(rq_array_t v, void *obj)
{
grow_if_necessary(v);
v->array[v->size] = obj;
v->size++;
}
void MemoryStream::write(const void *data, uint64 count)
{
uint64 nrs = position + count;
if(nrs < position)
throw MDFN_Error(ErrnoHolder(EFBIG));
grow_if_necessary(nrs);
memmove(&data_buffer[position], data, (size_t)count);
position += count;
}
RQ_EXPORT void
rq_array_insert_at(rq_array_t v, unsigned long offset, void *obj)
{
unsigned long i;
grow_if_necessary(v);
for (i = v->size-1; i >= offset; i--)
v->array[i+1] = v->array[i];
v->array[offset] = obj;
v->size++;
}
void ExtMemStream::write(const void *data, uint64 count)
{
uint64 nrs = position + count;
if(ro)
throw MDFN_Error(EINVAL, _("Write attempted to read-only ExtMemStream."));
if(nrs < position)
throw MDFN_Error(ErrnoHolder(EFBIG));
grow_if_necessary(nrs, position);
memmove(&data_buffer[position], data, count);
position += count;
}
//
// Don't add code to reduce the amount of memory allocated(when possible) without providing a
// per-stream setting to disable that behavior.
//
void MemoryStream::truncate(uint64 length)
{
grow_if_necessary(length, length);
data_buffer_size = length;
}
