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Code Issues Releases Wiki Activity

Fix creating a zero-sized pocket terminal

Browse Source 
When the terminal data is not present, width/height are set to 0, rather
than the terminal's width/height. This meant we'd create an empty
terminal, which then crashes when we try to render it.

We now make the terminal nullable and initialise it the first time we
receive the terminal data. To prevent future mistakes, we hide
width/height, and use TerminalState.create everywhere.

Fixes #1765
This commit is contained in:
Jonathan Coates 2024-03-26 21:54:48 +00:00
parent 63580b4acb
commit 6363164f2b
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GPG Key ID: B9E431FF07C98D06
6 changed files with 32 additions and 28 deletions
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8
projects/common/src/client/java/dan200/computercraft/client/pocket/ClientPocketComputers.java
View File

@ -6,7 +6,6 @@ package dan200.computercraft.client.pocket;
import dan200.computercraft.shared.computer.core.ComputerState;
import dan200.computercraft.shared.computer.core.ServerComputer;
import dan200.computercraft.shared.computer.terminal.NetworkedTerminal;
import dan200.computercraft.shared.computer.terminal.TerminalState;
import dan200.computercraft.shared.network.client.PocketComputerDataMessage;
import dan200.computercraft.shared.pocket.items.PocketComputerItem;
@ -47,13 +46,10 @@ public final class ClientPocketComputers {
public static void setState(UUID instanceId, ComputerState state, int lightColour, TerminalState terminalData) {
var computer = instances.get(instanceId);
if (computer == null) {
var terminal = new NetworkedTerminal(terminalData.width, terminalData.height, terminalData.colour);
instances.put(instanceId, computer = new PocketComputerData(state, lightColour, terminal));
instances.put(instanceId, new PocketComputerData(state, lightColour, terminalData));
} else {
computer.setState(state, lightColour);
computer.setState(state, lightColour, terminalData);
}
if (terminalData.hasTerminal()) terminalData.apply(computer.getTerminal());
}
public static @Nullable PocketComputerData get(ItemStack stack) {

21
projects/common/src/client/java/dan200/computercraft/client/pocket/PocketComputerData.java
View File

@ -6,8 +6,11 @@ package dan200.computercraft.client.pocket;
import dan200.computercraft.shared.computer.core.ComputerState;
import dan200.computercraft.shared.computer.terminal.NetworkedTerminal;
import dan200.computercraft.shared.computer.terminal.TerminalState;
import dan200.computercraft.shared.pocket.core.PocketServerComputer;
import javax.annotation.Nullable;
/**
* Clientside data about a pocket computer.
* <p>
@ -19,21 +22,21 @@ import dan200.computercraft.shared.pocket.core.PocketServerComputer;
* @see PocketServerComputer The server-side pocket computer.
*/
public final class PocketComputerData {
private final NetworkedTerminal terminal;
private @Nullable NetworkedTerminal terminal;
private ComputerState state;
private int lightColour;
PocketComputerData(ComputerState state, int lightColour, NetworkedTerminal terminal) {
PocketComputerData(ComputerState state, int lightColour, TerminalState terminalData) {
this.state = state;
this.lightColour = lightColour;
this.terminal = terminal;
if (terminalData.hasTerminal()) terminal = terminalData.create();
}
public int getLightState() {
return state != ComputerState.OFF ? lightColour : -1;
}
public NetworkedTerminal getTerminal() {
public @Nullable NetworkedTerminal getTerminal() {
return terminal;
}
@ -41,8 +44,16 @@ public final class PocketComputerData {
return state;
}
void setState(ComputerState state, int lightColour) {
void setState(ComputerState state, int lightColour, TerminalState terminalData) {
this.state = state;
this.lightColour = lightColour;
if (terminalData.hasTerminal()) {
if (terminal == null) {
terminal = terminalData.create();
} else {
terminalData.apply(terminal);
}
}
}
}

7
projects/common/src/main/java/dan200/computercraft/shared/computer/terminal/TerminalState.java
View File

@ -18,10 +18,9 @@ import javax.annotation.Nullable;
* states, etc...
*/
public class TerminalState {
public final boolean colour;
public final int width;
public final int height;
private final boolean colour;
private final int width;
private final int height;
@Nullable
private final ByteBuf buffer;

7
projects/common/src/main/java/dan200/computercraft/shared/peripheral/monitor/ClientMonitor.java
View File

@ -56,8 +56,11 @@ public final class ClientMonitor {
void read(TerminalState state) {
if (state.hasTerminal()) {
if (terminal == null) terminal = new NetworkedTerminal(state.width, state.height, state.colour);
state.apply(terminal);
if (terminal == null) {
terminal = state.create();
} else {
state.apply(terminal);
}
terminalChanged = true;
} else {
if (terminal != null) {

13
projects/common/src/test/java/dan200/computercraft/shared/computer/terminal/TerminalStateTest.java
View File

@ -11,7 +11,8 @@ import org.junit.jupiter.api.RepeatedTest;
import java.util.Random;
import static org.junit.jupiter.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
/**
* Tests {@link TerminalState} round tripping works as expected.
@ -42,6 +43,7 @@ public class TerminalStateTest {
private static void checkEqual(Terminal expected, Terminal actual) {
assertNotNull(expected, "Expected cannot be null");
assertNotNull(actual, "Actual cannot be null");
assertEquals(expected.isColour(), actual.isColour(), "isColour must match");
assertEquals(expected.getHeight(), actual.getHeight(), "Heights must match");
assertEquals(expected.getWidth(), actual.getWidth(), "Widths must match");
@ -51,13 +53,6 @@ public class TerminalStateTest {
}
private static NetworkedTerminal read(FriendlyByteBuf buffer) {
var state = new TerminalState(buffer);
assertTrue(state.colour);
if (!state.hasTerminal()) return null;
var other = new NetworkedTerminal(state.width, state.height, true);
state.apply(other);
return other;
return new TerminalState(buffer).create();
}
}

4
projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Pocket_Computer_Test.kt
View File

@ -41,7 +41,7 @@ class Pocket_Computer_Test {
val pocketComputer = ClientPocketComputers.get(minecraft.player!!.mainHandItem)!!
assertEquals(ComputerState.ON, pocketComputer.state)
val term = pocketComputer.terminal
val term = pocketComputer.terminal!!
assertEquals("Hello, world!", term.getLine(0).toString().trim(), "Terminal contents is synced")
}
// Update the terminal contents again.
@ -57,7 +57,7 @@ class Pocket_Computer_Test {
val pocketComputer = ClientPocketComputers.get(minecraft.player!!.mainHandItem)!!
assertEquals(ComputerState.BLINKING, pocketComputer.state)
val term = pocketComputer.terminal
val term = pocketComputer.terminal!!
assertEquals("Updated text :)", term.getLine(0).toString().trim(), "Terminal contents is synced")
}
}