int
buffer_file_write (buffer_file_t* bf,
const void* ptr,
size_t size)
{
if (!bf->can_update) {
return -1;
}
size_t new_position = bf->position + size;
if (new_position < bf->position) {
/* Overflow. */
return -1;
}
/* Resize if necessary. */
if (bf->capacity < new_position) {
buffer_unmap (bf->bd);
bf->capacity = ALIGN_UP (new_position, pagesize ());
bf->bd_size = bf->capacity / pagesize ();
if (buffer_resize (bf->bd, bf->bd_size) != 0) {
return -1;
}
bf->ptr = buffer_map (bf->bd);
if (bf->ptr == 0) {
return -1;
}
}
memcpy (bf->ptr + bf->position, ptr, size);
bf->position = new_position;
if (bf->position > bf->size) {
bf->size = bf->position;
*((size_t*)bf->ptr) = bf->size;
}
return 0;
}
int
buffer_file_put (buffer_file_t* bf,
char c)
{
if (!bf->can_update) {
return -1;
}
size_t new_position = bf->position + 1;
if (new_position < bf->position) {
/* Overflow. */
return -1;
}
/* Resize if necessary. */
if (bf->capacity < new_position) {
buffer_unmap (bf->bd);
bf->capacity = ALIGN_UP (new_position, pagesize ());
bf->bd_size = bf->capacity / pagesize ();
if (buffer_resize (bf->bd, bf->bd_size) != 0) {
return -1;
}
bf->ptr = buffer_map (bf->bd);
if (bf->ptr == 0) {
return -1;
}
}
*((char*)(bf->ptr + bf->position)) = c;
bf->position = new_position;
if (bf->position > bf->size) {
bf->size = bf->position;
*((size_t*)bf->ptr) = bf->size;
}
return 0;
}
void unmap()
{
bind();
buffer_unmap(target);
}