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Fix MemoryMount using incorrect file lengths

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- We checked the backing array when reading rather than the file's
   length, so could read beyond the end of the file.
 - We used the entry length when resizing, which effectively meant we
   doubled the size of the backing array on each write.
This commit is contained in:
Jonathan Coates 2024-02-07 21:36:17 +00:00
parent 8db5c6bc3a
commit f14cb2a3d1
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1 changed files with 3 additions and 3 deletions
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projects/core/src/main/java/dan200/computercraft/core/filesystem/MemoryMount.java
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@ -275,9 +275,9 @@ public final class MemoryMount extends AbstractInMemoryMount<MemoryMount.FileEnt
checkClosed();
var backing = Nullability.assertNonNull(entry.contents);
if (position >= backing.length) return -1;
if (position >= entry.length) return -1;
var remaining = Math.min(backing.length - (int) position, destination.remaining());
var remaining = Math.min(entry.length - (int) position, destination.remaining());
destination.put(backing, (int) position, remaining);
position += remaining;
return remaining;
@ -285,7 +285,7 @@ public final class MemoryMount extends AbstractInMemoryMount<MemoryMount.FileEnt
private byte[] ensureCapacity(int capacity) {
var contents = Nullability.assertNonNull(entry.contents);
if (capacity >= entry.length) {
if (capacity >= contents.length) {
var newCapacity = Math.max(capacity, contents.length << 1);
contents = entry.contents = Arrays.copyOf(contents, newCapacity);
}