Fix buf error on interrupt.

samuel-williams-shopify · samuel-williams-shopify · commit 67f7c8181a81 · 2026-02-26T17:19:34.000+13:00
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
@@ -1173,9 +1173,11 @@ zstream_run_try(VALUE value_arg)
        goto loop;
     }
 
-    if (flush != Z_FINISH && err == Z_BUF_ERROR
-	    && z->stream.avail_out > 0) {
-	z->flags |= ZSTREAM_FLAG_IN_STREAM;
+    if (flush != Z_FINISH && err == Z_BUF_ERROR && z->stream.avail_out > 0) {
+        z->flags |= ZSTREAM_FLAG_IN_STREAM;
+
+        /* Z_BUF_ERROR with avail_out > 0 is a valid state - don't raise error */
+        err = Z_OK;
     }
 
     zstream_reset_input(z);

Original file line number	Diff line number	Diff line change
`@@ -1173,9 +1173,11 @@ zstream_run_try(VALUE value_arg)`
`1173`	`1173`	`goto loop;`
`1174`	`1174`	`}`
`1175`	`1175`
`1176`		`- if (flush != Z_FINISH && err == Z_BUF_ERROR`
`1177`		`- && z->stream.avail_out > 0) {`
`1178`		`- z->flags \|= ZSTREAM_FLAG_IN_STREAM;`
	`1176`	`+ if (flush != Z_FINISH && err == Z_BUF_ERROR && z->stream.avail_out > 0) {`
	`1177`	`+ z->flags \|= ZSTREAM_FLAG_IN_STREAM;`
	`1178`	`+`
	`1179`	`+ /* Z_BUF_ERROR with avail_out > 0 is a valid state - don't raise error */`
	`1180`	`+ err = Z_OK;`
`1179`	`1181`	`}`
`1180`	`1182`
`1181`	`1183`	`zstream_reset_input(z);`