Looks like the extended type stuff has triggered an ancient bug.
Please try attached patch and see if you can process bigger maps again.
diff --git a/src/uk/me/parabola/imgfmt/app/BufferedImgFileWriter.java b/src/uk/me/parabola/imgfmt/app/BufferedImgFileWriter.java
index 37d5509..b1d6fb2 100644
--- a/src/uk/me/parabola/imgfmt/app/BufferedImgFileWriter.java
+++ b/src/uk/me/parabola/imgfmt/app/BufferedImgFileWriter.java
@@ -175,8 +175,10 @@ public class BufferedImgFileWriter implements ImgFileWriter {
* @param length The amount of data.
*/
private void ensureSize(int length) {
- if (buf.position() +length > bufferSize - GUARD_SIZE) {
- bufferSize += GROW_SIZE;
+ int needed = buf.position() + length;
+ if (needed > (bufferSize - GUARD_SIZE)) {
+ while(needed > (bufferSize - GUARD_SIZE))
+ bufferSize += GROW_SIZE;
if (bufferSize > 0xffffff) {
// Previous message was confusing people, although it is difficult to come
// up with something that is strictly true in all situations.
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