QEMUSizedBuffer *qsb_create(const uint8_t *buffer, size_t len) { QEMUSizedBuffer *qsb; size_t alloc_len, num_chunks, i, to_copy; size_t chunk_size = (len > QSB_MAX_CHUNK_SIZE) ? QSB_MAX_CHUNK_SIZE : QSB_CHUNK_SIZE; num_chunks = DIV_ROUND_UP(len ? len : QSB_CHUNK_SIZE, chunk_size); alloc_len = num_chunks * chunk_size; qsb = g_try_new0(QEMUSizedBuffer, 1); if (!qsb) { return NULL; } qsb->iov = g_try_new0(struct iovec, num_chunks); if (!qsb->iov) { g_free(qsb); return NULL; } qsb->n_iov = num_chunks; for (i = 0; i < num_chunks; i++) { qsb->iov[i].iov_base = g_try_malloc0(chunk_size); if (!qsb->iov[i].iov_base) { /* qsb_free is safe since g_free can cope with NULL */ qsb_free(qsb); return NULL; } qsb->iov[i].iov_len = chunk_size; if (buffer) { to_copy = (len - qsb->used) > chunk_size ? chunk_size : (len - qsb->used); memcpy(qsb->iov[i].iov_base, &buffer[qsb->used], to_copy); qsb->used += to_copy; } } qsb->size = alloc_len; return qsb; }