Fix date/datetime negative infinity decoder regression

This was introduced in 678f683.

Fixes: #62

Author: elprans

asyncpg/protocol/codecs/datetime.pyx

@@ -25,9 +25,9 @@ cdef int32_t pg_date_offset_ord = \
 
 # Binary representations of infinity for datetimes.
 cdef int64_t pg_time64_infinity = 0x7fffffffffffffff
-cdef int64_t pg_time64_negative_infinity = -1
+cdef int64_t pg_time64_negative_infinity = <int64_t>0x8000000000000000
 cdef int32_t pg_date_infinity = 0x7fffffff
-cdef int32_t pg_date_negative_infinity = -1
+cdef int32_t pg_date_negative_infinity = <int32_t>0x80000000
 
 infinity_datetime = datetime.datetime(
     datetime.MAXYEAR, 12, 31, 23, 59, 59, 999999)

setup.py

@@ -19,7 +19,7 @@
 if sys.version_info < (3, 5):
     raise RuntimeError('asyncpg requires Python 3.5 or greater')
 
-VERSION = '0.8.3'
+VERSION = '0.8.4'
 CFLAGS = ['-O2']
 LDFLAGS = []
 

tests/test_codecs.py

@@ -156,13 +156,17 @@ def _timezone(offset):
         datetime.datetime(250, 1, 1, 5, 25, 10),
         infinity_datetime,
         negative_infinity_datetime,
+        {'textinput': 'infinity', 'output': infinity_datetime},
+        {'textinput': '-infinity', 'output': negative_infinity_datetime},
     ]),
     ('date', 'date', [
         datetime.date(3000, 5, 20),
         datetime.date(2000, 1, 1),
         datetime.date(500, 1, 1),
-        datetime.date(1, 1, 1),
         infinity_date,
+        negative_infinity_date,
+        {'textinput': 'infinity', 'output': infinity_date},
+        {'textinput': '-infinity', 'output': negative_infinity_date},
     ]),
     ('time', 'time', [
         datetime.time(12, 15, 20),
@@ -360,15 +364,24 @@ async def test_standard_codecs(self):
                 "SELECT $1::" + typname
             )
 
+            textst = await self.con.prepare(
+                "SELECT $1::text::" + typname
+            )
+
             for sample in sample_data:
                 with self.subTest(sample=sample, typname=typname):
+                    stmt = st
                     if isinstance(sample, dict):
-                        inputval = sample['input']
+                        if 'textinput' in sample:
+                            inputval = sample['textinput']
+                            stmt = textst
+                        else:
+                            inputval = sample['input']
                         outputval = sample['output']
                     else:
                         inputval = outputval = sample
 
-                    result = await st.fetchval(inputval)
+                    result = await stmt.fetchval(inputval)
                     err_msg = (
                         "unexpected result for {} when passing {!r}: "
                         "received {!r}, expected {!r}".format(