py: Support conversion of bignum to bytes.

This gets int.to_bytes working for bignum, and also struct.pack with 'q'
and 'Q' args on 32-bit machines.

Addresses issue #1155.

2 files changed, 13 insertions, 3 deletions

diff --git a/tests/basics/int_bytes.py b/tests/basics/int_bytes.py
index 45965ed464..2f468da444 100644
--- a/tests/basics/int_bytes.py
+++ b/tests/basics/int_bytes.py
@@ -1,6 +1,7 @@
 print((10).to_bytes(1, "little"))
 print((111111).to_bytes(4, "little"))
 print((100).to_bytes(10, "little"))
+print((2**64).to_bytes(9, "little"))
 print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
 print(int.from_bytes(b"\x01\0\0\0\0\0\0\0", "little"))
 print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
diff --git a/tests/basics/struct1.py b/tests/basics/struct1.py
index 09ecd20a63..c473fc0b0c 100644
--- a/tests/basics/struct1.py
+++ b/tests/basics/struct1.py
@@ -30,9 +30,18 @@ print(v == (10, 100, 200, 300))
 print(struct.pack("<I", 2**32 - 1))
 print(struct.pack("<I", 0xffffffff))
 
-# fails on 32-bit machine
-#print(struct.pack("<Q", 2**64 - 1))
-#print(struct.pack("<Q", 0xffffffffffffffff))
+# long long ints
+print(struct.pack("<Q", 2**64 - 1))
+print(struct.pack("<Q", 0xffffffffffffffff))
+print(struct.pack("<q", -1))
+print(struct.pack("<Q", 1234567890123456789))
+print(struct.pack("<q", -1234567890123456789))
+print(struct.pack(">Q", 1234567890123456789))
+print(struct.pack(">q", -1234567890123456789))
+print(struct.unpack("<Q", b"\x12\x34\x56\x78\x90\x12\x34\x56"))
+print(struct.unpack(">Q", b"\x12\x34\x56\x78\x90\x12\x34\x56"))
+print(struct.unpack("<q", b"\x12\x34\x56\x78\x90\x12\x34\xf6"))
+print(struct.unpack(">q", b"\xf2\x34\x56\x78\x90\x12\x34\x56"))
 
 # check maximum unpack
 print(struct.unpack("<I", b"\xff\xff\xff\xff"))