Function SlCopyInternal

src/saveload/saveload.cpp:1101–1140

* Internal function to save/Load a list of SL_VARs. * SlCopy() and SlArray() are very similar, with the exception of the header. * This function represents the common part. * @param object The object being manipulated. * @param length The length of the object in elements * @param conv VarType type of the items. */

 * @param conv VarType type of the items.
 */
static void SlCopyInternal(void *object, size_t length, VarType conv)
{
	if (GetVarMemType(conv) == SLE_VAR_NULL) {
		assert(_sl.action != SLA_SAVE); // Use SL_NULL if you want to write null-bytes
		SlSkipBytes(length * SlCalcConvFileLen(conv));
		return;
	}

	/* NOTICE - handle some buggy stuff, in really old versions everything was saved
	 * as a byte-type. So detect this, and adjust object size accordingly */
	if (_sl.action != SLA_SAVE && _sl_version == 0) {
		/* all objects except difficulty settings */
		if (conv == SLE_INT16 || conv == SLE_UINT16 || conv == SLE_STRINGID ||
				conv == SLE_INT32 || conv == SLE_UINT32) {
			SlCopyBytes(object, length * SlCalcConvFileLen(conv));
			return;
		}
		/* used for conversion of Money 32bit->64bit */
		if (conv == (SLE_FILE_I32 | SLE_VAR_I64)) {
			for (uint i = 0; i < length; i++) {
				((int64_t*)object)[i] = (int32_t)std::byteswap(SlReadUint32());
			}
			return;
		}
	}

	/* If the size of elements is 1 byte both in file and memory, no special
	 * conversion is needed, use specialized copy-copy function to speed up things */
	if (conv == SLE_INT8 || conv == SLE_UINT8) {
		SlCopyBytes(object, length);
	} else {
		uint8_t *a = (uint8_t*)object;
		uint8_t mem_size = SlCalcConvMemLen(conv);

		for (; length != 0; length --) {
			SlSaveLoadConv(a, conv);
			a += mem_size; // get size
		}
	}
}

/**
 * Copy a list of SL_VARs to/from a savegame.