1 int Chunk_bounds_check(Chunk *chunk, size_t start, size_t n)
2 {
3     if (chunk == NULL) return 0;
4 
5     return start <= chunk->length && n <= chunk->length - start;
6 }
7 
8 void Chunk_copy(Chunk *src, size_t src_start, Chunk *dst, size_t dst_start, size_t n)
9 {
10     if (!Chunk_bounds_check(src, src_start, n)) return;
11     if (!Chunk_bounds_check(dst, dst_start, n)) return;
12 
13     memcpy(dst->data + dst_start, src->data + src_start, n);
14 }