Test large reads

test/test_large_read.capnp

@@ -0,0 +1,13 @@
+@0x86dbb3b256f5d2af;
+
+struct Row {
+  values @0 :List(Int32);
+}
+
+struct MultiArray {
+  rows @0 :List(Row);
+}
+
+struct Msg {
+  data @0 :List(UInt8);
+}

test/test_large_read.py

@@ -0,0 +1,42 @@
+import pytest
+import capnp
+import os
+import tempfile
+import sys
+
+this_dir = os.path.dirname(__file__)
+
+
+@pytest.fixture
+def test_capnp():
+    return capnp.load(os.path.join(this_dir, 'test_large_read.capnp'))
+
+
+def test_large_read(test_capnp):
+    f = tempfile.TemporaryFile()
+
+    array = test_capnp.MultiArray.new_message()
+
+    row = array.init('rows', 1)[0]
+    values = row.init('values', 10000)
+    for i in range(len(values)):
+        values[i] = i
+
+    array.write_packed(f)
+    f.seek(0)
+
+    array = test_capnp.MultiArray.read_packed(f)
+    del f
+    assert array.rows[0].values[9000] == 9000
+
+def test_large_read_multiple(test_capnp):
+    f = tempfile.TemporaryFile()
+    msg1 = test_capnp.Msg.new_message()
+    msg1.data = [0x41] * 8192
+    msg1.write(f)
+    msg2 = test_capnp.Msg.new_message()
+    msg2.write(f)
+    f.seek(0)
+
+    for m in test_capnp.Msg.read_multiple(f):
+        pass